JPH08145715A - Temperature correction circuit in sensor - Google Patents

Temperature correction circuit in sensor

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Publication number
JPH08145715A
JPH08145715A JP6290860A JP29086094A JPH08145715A JP H08145715 A JPH08145715 A JP H08145715A JP 6290860 A JP6290860 A JP 6290860A JP 29086094 A JP29086094 A JP 29086094A JP H08145715 A JPH08145715 A JP H08145715A
Authority
JP
Japan
Prior art keywords
temperature
correction
sensor
characteristic
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP6290860A
Other languages
Japanese (ja)
Inventor
Yasunori Kashiyou
安記 嘉正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP6290860A priority Critical patent/JPH08145715A/en
Publication of JPH08145715A publication Critical patent/JPH08145715A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE: To make optimum temperature correction in the detection output of a sensor provided with various temperature characteristics. CONSTITUTION: A temperature correction unit 1 of a temperature correction circuit A1 is composed of a fixed resistor R1 connected to a signal processing circuit 4 and a serial circuit of temperature detecting resistors Rt1 and Rt2 and transistors Q1 and Q2 connected to the fixed resistor R1 in parallel, respectively. These transistors Q1 and Q2 are turned ON/OFF selectively by means of a switch signal from a switch unit 3. The switch unit 3 switches transistors Q1 and Q2 when the detection temperature of a temperature detection element 2 is higher or lower than the transient point of the temperature characteristics of a sensor. Thereby, since temperature detecting resistors Rt1 and Rt2 connected with the fixed resistor R1 is switched by means of the detection temperature, the optimum temperature correction can be made in the detection output of the signal processing circuit 4, respectively, on the high temperature and low temperature sides from the transient point.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、温度によって検出出力
が変動する温度特性を有したセンサについて検出出力の
温度特性を補正して正しい検出出力を得ることができる
ようにするセンサの温度補正回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor temperature correction circuit for correcting a temperature characteristic of a detection output with respect to a sensor having a temperature characteristic in which a detection output fluctuates depending on a temperature so as to obtain a correct detection output. It is about.

【０００２】[0002]

【従来の技術】従来より、光や超音波のような物理量を
電気信号に変換する各種センサを物体検出用に応用した
光電スイッチ、近接スイッチあるいは超音波スイッチな
どがある。このようなスイッチに応用される物体検出セ
ンサは、その検出距離が周囲温度やセンサ自体の温度に
よって変わってしまうことがある。すなわち、一定の距
離にある検出対象に対する検出出力が温度によって変動
するのである。このような検出出力の温度特性が図１１
のａに示すように直線的な場合には、感温抵抗のような
直線的な温度係数を有する温度補正素子を用いることに
より、比較的容易に温度特性に補正をかけてその変化率
を許容範囲内に抑えることができる（同図のｂ参照）。2. Description of the Related Art Conventionally, there are photoelectric switches, proximity switches, ultrasonic switches, and the like in which various sensors that convert physical quantities such as light and ultrasonic waves into electric signals are applied for object detection. In the object detection sensor applied to such a switch, the detection distance may change depending on the ambient temperature or the temperature of the sensor itself. That is, the detection output with respect to the detection target located at a fixed distance varies depending on the temperature. The temperature characteristic of such a detection output is shown in FIG.
In the case of a straight line as shown in a, a temperature correction element having a linear temperature coefficient such as a temperature-sensitive resistor is used to relatively easily correct the temperature characteristic and allow the change rate. It can be suppressed within the range (see b in the figure).

【０００３】[0003]

【発明が解決しようとする課題】ところが、近年ではセ
ンサの出力を処理して検出出力を得る処理回路の複雑化
に伴い、検出出力の温度特性も処理回路を構成する種々
の回路素子の温度特性が複雑に絡み合うこととなって、
結果的に検出出力の温度特性が直線性を有しない場合も
でてきている。例えば、図１２のａに示すように、ある
特定の温度（温度特性の変移点）より高温側の領域と低
温側の領域とで温度特性が異なるセンサに温度補正をか
けて低温側の領域における変化率を許容範囲内に抑えよ
うとすると、高温側の領域における温度特性に補正が効
き過ぎて許容範囲を越えてしまう（同図のｂ参照）。ま
た、高温側の領域における変化率を許容範囲内に抑えよ
うとすると、今度は低温側の領域における温度特性に補
正を充分かけることができない。あるいは、図１３に示
すような温度特性を有したセンサに対しては高温側、低
温側のいずれの変化率も許容範囲内に抑えるような補正
をかけることができない。However, in recent years, as the processing circuit for processing the sensor output to obtain the detected output has become complicated, the temperature characteristic of the detected output also depends on the temperature characteristics of various circuit elements constituting the processing circuit. Becomes complicatedly intertwined,
As a result, the temperature characteristic of the detected output may not be linear. For example, as shown in a of FIG. 12, in a region on the low temperature side, temperature correction is performed on a sensor having different temperature properties between a region on a higher temperature side and a region on a lower temperature side than a certain specific temperature (transition point of temperature characteristic). If the rate of change is to be suppressed within the allowable range, the temperature characteristics in the high temperature region are overcorrected and exceed the allowable range (see b in the same figure). If the rate of change in the high temperature region is kept within the allowable range, the temperature characteristics in the low temperature region cannot be sufficiently corrected this time. Alternatively, the sensor having the temperature characteristics as shown in FIG. 13 cannot be corrected so that the rate of change on both the high temperature side and the low temperature side falls within the allowable range.

【０００４】また、図１４のａに示すように、低温側領
域では温度特性が平坦、すなわち温度に対して検出出力
が変動せず、高温側領域で許容範囲を越える温度特性を
有するようなセンサもある。このようなセンサでは、低
温側領域には補正をかける必要がないが、高温側領域の
変化率を許容範囲内に抑えるために補正をかけると、本
来補正が必要でない低温側領域にも補正が効いてしま
い、低温側領域の変化率までも許容範囲を越えてしまう
ような場合がある（同図のｂ参照）。Further, as shown in FIG. 14A, the sensor has a flat temperature characteristic in the low temperature region, that is, the detection output does not fluctuate with respect to temperature, and has a temperature characteristic exceeding the allowable range in the high temperature region. There is also. With such a sensor, it is not necessary to make corrections in the low temperature region, but if correction is performed in order to keep the rate of change in the high temperature region within the allowable range, it is possible to make corrections in the low temperature region where it is not necessary. In some cases, the effect is exerted, and the rate of change in the low temperature region also exceeds the allowable range (see b in the same figure).

【０００５】あるいは、図１５のａに示すように、高温
側領域では温度特性が平坦、すなわち温度に対して検出
出力が変動せず、低温側領域で許容範囲を越える温度特
性を有するようなセンサもある。このようなセンサで
は、高温側領域には補正をかける必要がないが、低温側
領域の変化率を許容範囲内に抑えるために温度特性に補
正をかけると、本来補正が必要でない高温側領域にも補
正が効いてしまい、高温側領域の変化率までも許容範囲
を越えてしまうような場合がある（同図のｂ参照）。Alternatively, as shown in FIG. 15A, the temperature characteristic is flat in the high temperature region, that is, the detection output does not fluctuate with respect to the temperature, and the temperature characteristic exceeds the allowable range in the low temperature region. There is also. With such a sensor, it is not necessary to make corrections in the high temperature region, but if the temperature characteristics are corrected in order to keep the rate of change in the low temperature region within the permissible range, it is possible to make corrections in the high temperature region that originally do not require correction. In some cases, the correction is effective, and the rate of change in the high temperature region also exceeds the allowable range (see b in the same figure).

【０００６】本発明は上記問題点の解決を目的とするも
のであり、種々の温度特性を有するセンサの検出出力に
最適な温度補正をかけることができる温度補正回路を提
供しようとするものである。An object of the present invention is to solve the above problems, and an object of the present invention is to provide a temperature correction circuit capable of optimally correcting the detection output of a sensor having various temperature characteristics. .

【０００７】[0007]

【課題を解決するための手段】請求項１の発明は、上記
目的を達成するために、温度により検出出力が変動する
温度特性を有するとともにある特定の温度より高温側と
低温側とで温度特性が異なるセンサの温度特性を補正す
る温度補正回路であって、高温側の温度特性を補正する
ための高温側補正係数及び低温側の温度特性を補正する
ための低温側補正係数が切り換えられてセンサの温度特
性を補正する温度補正部と、温度を検出する温度検出素
子と、温度検出素子の検出温度に基づいて温度補正部に
おける補正係数を切り換える切換部とを備えたことを特
徴とする。In order to achieve the above object, the invention of claim 1 has a temperature characteristic in which the detection output varies depending on the temperature and has a temperature characteristic on a higher temperature side and a lower temperature side than a specific temperature. A temperature correction circuit that corrects the temperature characteristics of different sensors, in which a high temperature side correction coefficient for correcting the high temperature side temperature characteristics and a low temperature side correction coefficient for correcting the low temperature side temperature characteristics are switched. And a temperature detecting element for detecting the temperature, and a switching section for switching the correction coefficient in the temperature correcting section based on the temperature detected by the temperature detecting element.

【０００８】請求項２の発明は、請求項１の発明におい
て、温度補正部はセンサの出力を信号処理して検出出力
を得る信号処理部の温度特性を補正することを特徴とす
る。請求項３の発明は、請求項１の発明において、温度
補正部はセンサの出力を所定の基準値と比較して検出出
力を得る比較部の基準値の温度特性を補正することを特
徴とする。According to a second aspect of the present invention, in the first aspect of the invention, the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain a detection output. According to a third aspect of the invention, in the first aspect of the invention, the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value. .

【０００９】請求項４の発明は、請求項１の発明におい
て、温度補正部はセンサの出力を増幅する増幅部の温度
特性を補正することを特徴とする。請求項５の発明は、
上記目的を達成するために、ある特定の温度より低温側
では温度による検出出力の変動がなく高温側でのみ温度
により検出出力が変動する温度特性を有するセンサの温
度特性を補正する温度補正回路であって、高温側の温度
特性を補正する温度補正部と、温度を検出する温度検出
素子と、温度検出素子の検出出力が上記特定の温度より
高いときにのみ温度補正部を動作させる温度補正制御手
段とを備えたことを特徴とする。According to a fourth aspect of the invention, in the first aspect of the invention, the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. The invention of claim 5 is
In order to achieve the above object, a temperature correction circuit that corrects the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the lower temperature side than a certain temperature and the detection output fluctuates on the high temperature side only Therefore, a temperature correction unit that corrects the temperature characteristics on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction control that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the above specific temperature. And means.

【００１０】請求項６の発明は、請求項５の発明におい
て、温度補正部はセンサの出力を信号処理して検出出力
を得る信号処理部の温度特性を補正することを特徴とす
る。請求項７の発明は、請求項５の発明において、温度
補正部はセンサの出力を所定の基準値と比較して検出出
力を得る比較部の基準値の温度特性を補正することを特
徴とする。According to a sixth aspect of the present invention, in the fifth aspect, the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain a detection output. The invention of claim 7 is characterized in that, in the invention of claim 5, the temperature correction part corrects the temperature characteristic of the reference value of the comparison part for obtaining the detection output by comparing the output of the sensor with a predetermined reference value. .

【００１１】請求項８の発明は、請求項５の発明におい
て、温度補正部はセンサの出力を増幅する増幅部の温度
特性を補正することを特徴とする。請求項９の発明は、
上記目的を達成するために、ある特定の温度より高温側
では温度による検出出力の変動がなく低温側でのみ温度
により検出出力が変動する温度特性を有するセンサの温
度特性を補正する温度補正回路であって、低温側の温度
特性を補正する温度補正部と、温度を検出する温度検出
素子と、温度検出素子の検出出力が上記特定の温度より
低いときにのみ温度補正部を動作させる温度補正制御手
段とを備えたことを特徴とする。The invention of claim 8 is characterized in that, in the invention of claim 5, the temperature correction section corrects the temperature characteristic of the amplification section for amplifying the output of the sensor. The invention of claim 9 is
In order to achieve the above object, a temperature correction circuit that corrects the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the higher temperature side than a certain temperature and the detection output fluctuates only on the low temperature side Therefore, a temperature correction unit that corrects the temperature characteristics on the low temperature side, a temperature detection element that detects the temperature, and a temperature correction control that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the above specified temperature. And means.

【００１２】請求項１０の発明は、請求項９の発明にお
いて、温度補正部はセンサの出力を信号処理して検出出
力を得る信号処理部の温度特性を補正することを特徴と
する。請求項１１の発明は、請求項９の発明において、
温度補正部はセンサの出力を所定の基準値と比較して検
出出力を得る比較部の基準値の温度特性を補正すること
を特徴とする。According to a tenth aspect of the invention, in the ninth aspect of the invention, the temperature correction section corrects the temperature characteristic of the signal processing section for processing the output of the sensor to obtain a detection output. According to the invention of claim 11, in the invention of claim 9,
The temperature correction unit is characterized by correcting the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value.

【００１３】請求項１２の発明は、請求項９の発明にお
いて、温度補正部はセンサの出力を増幅する増幅部の温
度特性を補正することを特徴とする。According to a twelfth aspect of the invention, in the ninth aspect of the invention, the temperature correction section corrects the temperature characteristic of the amplification section for amplifying the output of the sensor.

【００１４】[0014]

【作用】請求項１の発明の構成では、温度により検出出
力が変動する温度特性を有するとともにある特定の温度
より高温側と低温側とで温度特性が異なるセンサの温度
特性を補正する温度補正回路であって、高温側の温度特
性を補正するための高温側補正係数及び低温側の温度特
性を補正するための低温側補正係数が切り換えられてセ
ンサの温度特性を補正する温度補正部と、温度を検出す
る温度検出素子と、温度検出素子の検出温度に基づいて
温度補正部における補正係数を切り換える切換部とを備
えたので、温度検出素子により検出した温度が上記特定
の温度より高温の場合には、切換部により温度補正部に
おける補正係数が高温側の補正係数に切り換えられ、反
対に上記特定の温度より低温の場合には、切換部により
温度補正部における補正係数が低温側の補正係数に切り
換えられるため、ある特定の温度より高温側と低温側と
で温度特性が異なるセンサの検出出力の温度特性がほぼ
一定となるような適切な補正をかけることができる。According to the structure of the present invention, the temperature correction circuit corrects the temperature characteristic of the sensor which has a temperature characteristic in which the detection output fluctuates depending on the temperature and has different temperature characteristics on the high temperature side and the low temperature side of a certain temperature. A temperature correction unit for correcting the temperature characteristic of the sensor by switching between the high temperature side correction coefficient for correcting the high temperature side temperature characteristic and the low temperature side correction coefficient for correcting the low temperature side temperature characteristic; Since the temperature detection element for detecting the temperature and the switching unit for switching the correction coefficient in the temperature correction unit based on the detected temperature of the temperature detection element are provided, when the temperature detected by the temperature detection element is higher than the specific temperature. The switching unit switches the correction coefficient in the temperature correction unit to the correction coefficient on the high temperature side. On the contrary, when the temperature is lower than the specific temperature, the switching unit causes the temperature correction unit to change the correction coefficient. Since the correction coefficient is switched to the correction coefficient on the low temperature side, it is possible to apply appropriate correction so that the temperature characteristics of the detection output of the sensor where the temperature characteristics differ between the higher temperature side and the lower temperature side than a certain temperature are almost constant. it can.

【００１５】請求項２の発明の構成では、温度補正部は
センサの出力を信号処理して検出出力を得る信号処理部
の温度特性を補正するため、補正を容易に行うことがで
きる。請求項３の発明の構成では、温度補正部はセンサ
の出力を所定の基準値と比較して検出出力を得る比較部
の基準値の温度特性を補正するため、複数のセンサの出
力を差動増幅して検出出力を得るような場合でもセンサ
毎に温度補正部及び切換部を設ける必要がなく、複数の
センサにも容易に対応することができる。According to the second aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain the detected output, so that the correction can be easily performed. In the configuration of the invention of claim 3, since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value, the outputs of the plurality of sensors are differentiated. Even when amplification is performed to obtain a detection output, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００１６】請求項４の発明の構成では、温度補正部は
センサの出力を増幅する増幅部の温度特性を補正するた
め、増幅部が飽和してしまうような場合でも増幅度を下
げるように温度補正をかければダイナミックレンジの拡
大と温度補正とが同時に実現できる。請求項５の発明の
構成では、ある特定の温度より低温側では温度による検
出出力の変動がなく高温側でのみ温度により検出出力が
変動する温度特性を有するセンサの温度特性を補正する
温度補正回路であって、高温側の温度特性を補正する温
度補正部と、温度を検出する温度検出素子と、温度検出
素子の検出出力が上記特定の温度より高いときにのみ温
度補正部を動作させる温度補正制御手段とを備えたの
で、温度検出素子により検出した温度が上記特定の温度
より低温の場合には温度補正部による温度補正が行われ
ず、反対に上記特定の温度より高温の場合には、温度補
正制御手段が温度補正部を制御してセンサの検出出力に
対する温度補正を行うため、ある特定の温度より低温側
では温度による検出出力の変動がなく高温側でのみ温度
により検出出力が変動する温度特性を有するセンサの検
出出力の温度特性がほぼ一定となるような適切な補正を
かけることができる。In the structure of the invention of claim 4, since the temperature correction section corrects the temperature characteristic of the amplification section for amplifying the output of the sensor, the temperature correction section reduces the amplification degree even when the amplification section is saturated. If correction is applied, expansion of the dynamic range and temperature correction can be realized at the same time. In the configuration of the invention of claim 5, the temperature correction circuit for correcting the temperature characteristic of the sensor having the temperature characteristic that the detection output does not fluctuate due to temperature on the lower temperature side than a certain specific temperature and the detection output fluctuates on the high temperature side only. And a temperature correction unit that corrects the temperature characteristic on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. With the control means, when the temperature detected by the temperature detecting element is lower than the specific temperature, the temperature correction unit does not perform temperature correction, and conversely, when the temperature is higher than the specific temperature, the temperature is Since the correction control unit controls the temperature correction unit to perform temperature correction on the detection output of the sensor, there is no fluctuation in the detection output due to temperature on the lower temperature side than a certain specific temperature, and only on the high temperature side. Ri temperature characteristic of the detection output of the sensor detection output has a temperature characteristic variation can apply a substantially constant and so as a proper correction.

【００１７】請求項６の発明の構成では、温度補正部は
センサの出力を信号処理して検出出力を得る信号処理部
の温度特性を補正するので、補正を容易に行うことがで
きる。請求項７の発明の構成では、温度補正部はセンサ
の出力を所定の基準値と比較して検出出力を得る比較部
の基準値の温度特性を補正するので、複数のセンサの出
力を差動増幅して検出出力を得るような場合でもセンサ
毎に温度補正部及び切換部を設ける必要がなく、複数の
センサにも容易に対応することができる。According to the sixth aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain the detected output, so that the correction can be easily performed. In the configuration of the invention of claim 7, since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value, the outputs of the plurality of sensors are differentiated. Even when amplification is performed to obtain a detection output, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００１８】請求項８の発明の構成では、温度補正部は
センサの出力を増幅する増幅部の温度特性を補正するの
で、増幅部が飽和してしまうような場合でも増幅度を下
げるように温度補正をかければダイナミックレンジの拡
大と温度補正とが同時に実現できる。請求項９の発明の
構成では、ある特定の温度より高温側では温度による検
出出力の変動がなく低温側でのみ温度により検出出力が
変動する温度特性を有するセンサの温度特性を補正する
温度補正回路であって、低温側の温度特性を補正する温
度補正部と、温度を検出する温度検出素子と、温度検出
素子の検出出力が上記特定の温度より低いときにのみ温
度補正部を動作させる温度補正制御手段とを備えたの
で、温度検出素子により検出した温度が上記特定の温度
より高温の場合には温度補正部による温度補正が行われ
ず、反対に上記特定の温度より低温の場合には、温度補
正制御手段が温度補正部を制御してセンサの検出出力に
対する温度補正を行うため、ある特定の温度より高温側
では温度による検出出力の変動がなく低温側でのみ温度
により検出出力が変動する温度特性を有するセンサの検
出出力の温度特性がほぼ一定となるような適切な補正を
かけることができる。According to the eighth aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. Therefore, even when the amplification unit is saturated, the temperature is adjusted so as to reduce the amplification degree. If correction is applied, expansion of the dynamic range and temperature correction can be realized at the same time. According to the configuration of the invention of claim 9, a temperature correction circuit for correcting the temperature characteristic of the sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the higher temperature side than a certain temperature and the detection output fluctuates only on the low temperature side. And a temperature correction unit that corrects the temperature characteristic on the low temperature side, a temperature detection element that detects the temperature, and a temperature correction that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. With the control means, when the temperature detected by the temperature detecting element is higher than the specific temperature, the temperature correction unit does not perform temperature correction, and conversely, when the temperature is lower than the specific temperature, Since the correction control means controls the temperature correction unit to perform temperature correction on the detection output of the sensor, there is no fluctuation in the detection output due to temperature on the higher temperature side than a certain specific temperature, and only on the low temperature side. Ri temperature characteristic of the detection output of the sensor detection output has a temperature characteristic variation can apply a substantially constant and so as a proper correction.

【００１９】請求項１０の発明の構成では、温度補正部
はセンサの出力を信号処理して検出出力を得る信号処理
部の温度特性を補正するので、補正を容易に行うことが
できる。請求項１１の発明の構成では、温度補正部はセ
ンサの出力を所定の基準値と比較して検出出力を得る比
較部の基準値の温度特性を補正するので、複数のセンサ
の出力を差動増幅して検出出力を得るような場合でもセ
ンサ毎に温度補正部及び切換部を設ける必要がなく、複
数のセンサにも容易に対応することができる。In the structure of the tenth aspect of the invention, the temperature correction unit corrects the temperature characteristic of the signal processing unit which processes the output of the sensor to obtain the detection output, so that the correction can be easily performed. In the configuration of the invention of claim 11, since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value, the outputs of the plurality of sensors are differentiated. Even when amplification is performed to obtain a detection output, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００２０】請求項１２の発明の構成では、温度補正部
はセンサの出力を増幅する増幅部の温度特性を補正する
ので、増幅部が飽和してしまうような場合でも増幅度を
下げるように温度補正をかければダイナミックレンジの
拡大と温度補正とが同時に実現できる。According to the twelfth aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. If correction is applied, expansion of the dynamic range and temperature correction can be realized at the same time.

【００２１】[0021]

【実施例】【Example】

（実施例１）図１は本発明の第１の実施例を示す回路ブ
ロック図である。本実施例の温度補正回路Ａ1 は、ある
特定の温度（変移点）より高温側と低温側とで温度特性
が異なる図１２に示したようなセンサの温度特性を補正
するためのものである。すなわち、図示しないセンサか
らの出力を信号処理して検出出力を得る信号処理回路４
の温度特性を温度補正回路Ａ1 によって補正をかけるも
のである。なお、５は信号処理回路４からの検出出力に
基づいてスイッチ等をオン・オフする出力回路である。(Embodiment 1) FIG. 1 is a circuit block diagram showing a first embodiment of the present invention. The temperature correction circuit A 1 of this embodiment is for correcting the temperature characteristic of the sensor as shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side with respect to a certain specific temperature (transition point). . That is, the signal processing circuit 4 that obtains a detection output by processing the output from a sensor (not shown).
The temperature characteristic of is corrected by the temperature correction circuit A 1 . Reference numeral 5 is an output circuit for turning on and off switches and the like based on the detection output from the signal processing circuit 4.

【００２２】温度補正回路Ａ1 は、信号処理回路４の温
度特性を補正する温度補正部１と、周囲温度やセンサ自
体の温度などを検出する感温抵抗から成る温度検出素子
２と、温度検出素子２による検出温度が上記変移点の温
度より高温か低温かを判別して切換信号を温度補正部１
に出力する切換部３とを備えている。温度補正部１は、
信号処理回路４に接続された固定抵抗Ｒ1 に感温抵抗Ｒ
ｔ1とトランジスタＱ1 の直列回路及び感温抵抗Ｒｔ2
とトランジスタＱ2 の直列回路を並列に接続して構成し
てある。そして、トランジスタＱ1 ，Ｑ2 は切換部３か
らの切換信号によって選択的にオン・オフされる。The temperature correction circuit A 1 includes a temperature correction unit 1 that corrects the temperature characteristics of the signal processing circuit 4, a temperature detection element 2 that includes a temperature-sensitive resistor that detects the ambient temperature and the temperature of the sensor itself, and temperature detection. It is determined whether the temperature detected by the element 2 is higher or lower than the temperature at the transition point, and the switching signal is sent to the temperature correction unit 1.
And a switching unit 3 for outputting to. The temperature correction unit 1
The temperature-sensitive resistor R 1 is connected to the fixed resistor R 1 connected to the signal processing circuit 4.
t 1 and transistor Q 1 in series circuit and temperature-sensitive resistor Rt 2
And a transistor Q 2 in a series circuit connected in parallel. The transistors Q 1 and Q 2 are selectively turned on / off by a switching signal from the switching unit 3.

【００２３】すなわち、温度検出素子２の検出温度が上
記変移点より低温であった場合には、切換部３は切換信
号により温度補正部１のトランジスタＱ1 をオンとし、
トランジスタＱ2 をオフとすることにより、固定抵抗Ｒ
1 と感温抵抗Ｒｔ1 の直列接続による合成抵抗で決まる
補正係数の温度補正を信号処理回路４にかけることがで
きる。一方、温度検出素子２の検出温度が変移点より高
温であった場合には、切換部３は切換信号により温度補
正部１のトランジスタＱ1 をオフとしトランジスタＱ2
をオンとすることにより、固定抵抗Ｒ1 と感温抵抗Ｒｔ
2 の直列接続による合成抵抗で決まる補正係数の温度補
正を信号処理回路４にかけることができる。That is, when the temperature detected by the temperature detecting element 2 is lower than the transition point, the switching unit 3 turns on the transistor Q 1 of the temperature correction unit 1 by the switching signal,
By turning off the transistor Q 2 , a fixed resistance R
The signal processing circuit 4 can be subjected to temperature correction with a correction coefficient determined by the combined resistance of 1 and the temperature-sensitive resistor Rt 1 connected in series. On the other hand, when the detected temperature of the temperature detecting element 2 is higher than the transition point, the switching unit 3 turns off the transistor Q 1 of the temperature correction unit 1 by the switching signal and turns off the transistor Q 2
By turning on, the fixed resistance R 1 and the temperature sensitive resistance Rt
It is possible to apply the temperature correction of the correction coefficient determined by the combined resistance of the two connected in series to the signal processing circuit 4.

【００２４】上述の構成では、温度検出素子２による検
出温度に応じて信号処理回路４に接続される感温抵抗Ｒ
ｔ1 ，Ｒｔ2 を切り換える切換部３を備えたので、接続
される感温抵抗Ｒｔ1 ，Ｒｔ2 によって低温側領域の温
度補正に適した補正係数と高温側領域の温度補正に適し
た補正係数とを選択することができ、低温側領域と高温
側領域で温度特性が異なるセンサの検出出力に対して温
度特性がぼほ一定なるような最適な温度補正をかけるこ
とができる。なお、感温抵抗Ｒｔ1 ，Ｒｔ2 は、センサ
の検出出力の温度特性が正負いずれの場合もあるから、
センサが使用される場所の環境に応じて最適な補正がか
けれるように正温度係数，負温度係数のものを適宜選択
して使用すればよい。In the above configuration, the temperature sensitive resistor R connected to the signal processing circuit 4 according to the temperature detected by the temperature detecting element 2.
Since the switching unit 3 for switching between t 1 and Rt 2 is provided, the correction coefficient suitable for the temperature correction in the low temperature side region and the correction coefficient suitable for the temperature correction in the high temperature side region depending on the connected temperature sensitive resistors Rt 1 and Rt 2 . Can be selected, and optimum temperature correction can be applied to the detection output of the sensor having different temperature characteristics in the low temperature side region and the high temperature side region so that the temperature characteristic becomes almost constant. The temperature resistances Rt 1 and Rt 2 may have positive or negative temperature characteristics of the detection output of the sensor.
A sensor having a positive temperature coefficient or a negative temperature coefficient may be appropriately selected and used so that the optimum correction can be applied according to the environment where the sensor is used.

【００２５】（実施例２）図２は本発明の第２の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ2 は、実施例１と同じくある特定の温度（変移点）よ
り高温側と低温側とで温度特性が異なる図１２に示した
ようなセンサの温度特性を補正するためのものである。
なお、本実施例における温度補正回路Ａ2 の基本構成は
実施例１のものと共通であり、共通する部分については
同一の符号を付して説明は省略する。また、本実施例で
は上述のようなセンサとしてホトダイオードから成る光
電センサ１１を例示しているが、これに限定するもので
はない。(Embodiment 2) FIG. 2 is a circuit block diagram showing a second embodiment of the present invention. The temperature correction circuit A 2 of the present embodiment corrects the temperature characteristics of the sensor as shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side with respect to a certain specific temperature (transition point) as in the first embodiment. It is for.
The basic configuration of the temperature correction circuit A 2 in this embodiment is the same as that of the first embodiment, and the common parts are denoted by the same reference numerals and the description thereof is omitted. Further, in the present embodiment, the photoelectric sensor 11 composed of a photodiode is exemplified as the above-mentioned sensor, but the sensor is not limited to this.

【００２６】図２に示すように、本実施例では、オペア
ンプＯＰ1 を備えた増幅回路６で増幅されたセンサの出
力電圧を比較回路７において基準電圧Ｖｒと比較し、比
較回路７の出力を積分回路等の処理回路８で処理して得
られる検出出力を出力回路５に与えており、温度補正回
路Ａ2 は比較回路７の基準電圧Ｖｒを温度検出素子２の
検出温度に応じて変化させるものである。As shown in FIG. 2, in this embodiment, the output voltage of the sensor amplified by the amplifier circuit 6 having the operational amplifier OP 1 is compared with the reference voltage Vr in the comparator circuit 7, and the output of the comparator circuit 7 is compared. The detection output obtained by processing by the processing circuit 8 such as an integrating circuit is given to the output circuit 5, and the temperature correction circuit A 2 changes the reference voltage Vr of the comparison circuit 7 according to the temperature detected by the temperature detection element 2. It is a thing.

【００２７】本実施例の温度補正回路Ａ2 は、温度補正
部１を比較回路７の基準電圧Ｖｒが入力される側の端子
に接続してある。なお、切換部３は温度検出素子２によ
る分圧電圧を基準電圧と比較するコンパレータ９と、コ
ンパレータ９の出力を反転するインバータ１０とにより
構成してある。ここで、温度検出素子２の抵抗値が温度
によって変化すると、コンパレータ９からはハイ，ロー
の２値の電圧が出力される。コンパレータ９の出力電圧
がハイの場合にはトランジスタＱ1 がオフ、トランジス
タＱ2 がオンとなり、出力電圧がローの場合にはトラン
ジスタＱ1 がオン、トランジスタＱ2 がオフとなる。す
なわち、トランジスタＱ1 がオン、トランジスタＱ2 が
オフの場合には比較回路７には感温抵抗Ｒｔ1 が接続さ
れて基準電圧Ｖｒ1 が得られる。また、トランジスタＱ
1 がオフ、トランジスタＱ2 がオンの場合には比較回路
７に感温抵抗Ｒｔ2 が接続されて基準電圧Ｖｒ2 が得ら
れる。しかも、これらの基準電圧Ｖｒ1 ，Ｖｒ2 は感温
抵抗Ｒｔ1 ，Ｒｔ2 の抵抗温度変化率に応じた温度特性
を持つことになる。In the temperature correction circuit A 2 of this embodiment, the temperature correction unit 1 is connected to the terminal of the comparison circuit 7 on the side to which the reference voltage Vr is input. The switching unit 3 is composed of a comparator 9 that compares the divided voltage of the temperature detecting element 2 with a reference voltage, and an inverter 10 that inverts the output of the comparator 9. Here, when the resistance value of the temperature detection element 2 changes with temperature, the comparator 9 outputs a binary voltage of high and low. When the output voltage of the comparator 9 is high, the transistor Q 1 is off and the transistor Q 2 is on. When the output voltage is low, the transistor Q 1 is on and the transistor Q 2 is off. That is, when the transistor Q 1 is on and the transistor Q 2 is off, the temperature sensitive resistor Rt 1 is connected to the comparison circuit 7 and the reference voltage Vr 1 is obtained. Also, the transistor Q
When 1 is off and the transistor Q 2 is on, the temperature-sensitive resistor Rt 2 is connected to the comparison circuit 7 to obtain the reference voltage Vr 2 . Moreover, these reference voltages Vr 1 and Vr 2 have temperature characteristics corresponding to the resistance temperature change rates of the temperature sensitive resistors Rt 1 and Rt 2 .

【００２８】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、これら基準電圧Ｖｒ
1 ，Ｖｒ2 は感温抵抗Ｒｔ1 ，Ｒｔ2 の抵抗温度係数に
応じた温度特性を持つから、低温側領域と高温側領域で
温度特性が異なるセンサの検出出力に対して温度特性が
ほぼ一定となるような最適な補正をかけることができ
る。なお、感温抵抗Ｒｔ 1 ，Ｒｔ2 は、センサの検出出
力の温度特性が正負いずれの場合もあるから、センサが
使用される場所の環境に応じて最適な補正がかけれるよ
うに正温度係数，負温度係数のものを適宜選択して使用
すればよい。According to the above configuration, the temperature on the low temperature side from the transition point is
The reference voltage Vr of the comparison circuit 7 in the region and the region on the high temperature side.1,
Vr2And the reference voltage Vr
1, Vr2Is the temperature sensitive resistance Rt1, Rt2To the temperature coefficient of resistance of
Since it has a corresponding temperature characteristic, it can be used in the low temperature area and high temperature area.
The temperature characteristic is different from the detection output of the sensor with different temperature characteristic.
You can apply the optimum correction that is almost constant.
It The temperature-sensitive resistance Rt 1, Rt2Is detected by the sensor
Since the temperature characteristic of force may be positive or negative, the sensor
Optimal correction can be applied according to the environment of the place where it is used
Select and use positive temperature coefficient and negative temperature coefficient
do it.

【００２９】（実施例３）図３は本発明の第３の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ3 は、実施例１，２と同じくある特定の温度（変移
点）より高温側と低温側とで温度特性が異なる図１２に
示したようなセンサの温度特性を補正するためのもので
ある。なお、本実施例における温度補正回路Ａ3 の基本
構成は実施例２のものと共通であり、共通する部分につ
いては同一の符号を付して説明は省略する。また、本実
施例では上述のようなセンサとしてホトダイオードから
成る光電センサ１１を例示しているが、これに限定する
ものではない。(Embodiment 3) FIG. 3 is a circuit block diagram showing a third embodiment of the present invention. The temperature correction circuit A 3 of the present embodiment has the same temperature characteristic of the sensor as shown in FIG. It is for correction. The basic configuration of the temperature correction circuit A 3 in this embodiment is the same as that of the second embodiment, and the common parts are denoted by the same reference numerals and the description thereof will be omitted. Further, in the present embodiment, the photoelectric sensor 11 composed of a photodiode is exemplified as the above-mentioned sensor, but the sensor is not limited to this.

【００３０】図３に示すように、本実施例では、２つの
光電センサ１１1 ，１１2 の出力電圧を増幅回路６1 ，
６2 で増幅した後、両者の出力電圧を差動増幅回路１２
で差動増幅し、この差動増幅回路１２の出力電圧を比較
回路７において基準電圧Ｖｒと比較しており、温度補正
回路Ａ3 の構成については実施例２における温度補正回
路Ａ2 の構成と同一である。As shown in FIG. 3, in this embodiment, the output voltages of the two photoelectric sensors 11 1 and 11 2 are amplified by the amplifier circuits 6 1 and 6 1 .
After amplified by 6 2, the differential amplifier circuit 12 both output voltage
In differentially amplified, is compared with the reference voltage Vr in the comparison circuit 7 the output voltage of the differential amplifier circuit 12, and temperature compensation circuit A 2 configuration in the second embodiment the configuration of the temperature compensation circuit A 3 It is the same.

【００３１】上述のように、２つの光電センサ１１1 ，
１１2 を有する場合（例えば、測距センサのような場
合）、両光電センサ１１1 ，１１2 の出力電圧を差動増
幅した後の比較回路７における基準電圧Ｖｒに温度補正
をかけるため、各光電センサ１１1 ，１１2 ごとに温度
補正を切り換えてかける必要がなく、切換部３は１つで
済み回路構成を簡略化することができる。また、光電セ
ンサ１１1 ，１１2 の出力電圧をある程度増幅した後で
信号処理することにより、耐ノイズ性を向上できるとい
う利点もある。As described above, the two photoelectric sensors 11 1 ,
In the case of having 11 2 (for example, in the case of a distance measuring sensor), the reference voltage Vr in the comparison circuit 7 after differentially amplifying the output voltage of both photoelectric sensors 11 1 and 11 2 is subjected to temperature correction, It is not necessary to switch the temperature correction for each of the photoelectric sensors 11 1 and 11 2 , and only one switching unit 3 is required, and the circuit configuration can be simplified. There is also an advantage that the noise resistance can be improved by performing signal processing after amplifying the output voltages of the photoelectric sensors 11 1 and 11 2 to some extent.

【００３２】（実施例４）図４は本発明の第４の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ4 は、実施例１及び実施例２と同じくある特定の温度
（変移点）より高温側と低温側とで温度特性が異なる図
１２に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例における温度補正回路Ａ4
の基本構成は実施例１及び実施例２のものと共通であ
り、共通する部分については同一の符号を付して説明は
省略する。(Embodiment 4) FIG. 4 is a circuit block diagram showing a fourth embodiment of the present invention. The temperature correction circuit A 4 of the present embodiment has the same sensor temperature as that shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side from the same specific temperature (transition point) as in the first and second embodiments. It is for correcting the characteristics. The temperature correction circuit A 4 in this embodiment is
The basic configuration of is common to that of the first and second embodiments, and the common portions are denoted by the same reference numerals and the description thereof will be omitted.

【００３３】本実施例の温度補正回路Ａ4 は、増幅回路
６を構成するオペアンプＯＰ1 の入力側に温度補正部１
を設けてある。つまり、オペアンプＯＰ1 の反転側入力
端と出力端との間に接続される帰還抵抗Ｒｆと直列に、
アナログスイッチＡＳ1 ，ＡＳ2 と感温抵抗Ｒｔ1 ，Ｒ
ｔ2 との直列回路を接続し、コンパレータ９の出力で２
つのアナログスイッチＡＳ1 ，ＡＳ2 を選択的にオンし
て増幅回路６の増幅度の温度特性を切り換えるようにし
てある。In the temperature correction circuit A 4 of this embodiment, the temperature correction unit 1 is provided on the input side of the operational amplifier OP 1 which constitutes the amplifier circuit 6.
Is provided. That is, in series with the feedback resistor Rf connected between the inverting side input terminal and the output terminal of the operational amplifier OP 1 ,
Analog switches AS 1 and AS 2 and temperature-sensitive resistors Rt 1 and R
Connect a series circuit with t 2 and output 2
The two analog switches AS 1 and AS 2 are selectively turned on to switch the temperature characteristic of the amplification degree of the amplifier circuit 6.

【００３４】すなわち、温度検出素子２の抵抗値が温度
によって変化すると、コンパレータ９からはハイ，ロー
の２値の電圧が出力され、コンパレータ９の出力電圧が
ハイの場合にはアナログスイッチＡＳ1 がオン、アナロ
グスイッチＡＳ2 がオフとなり、出力電圧がローの場合
にはアナログスイッチＡＳ1 がオフ、アナログスイッチ
ＡＳ2 がオンとなる。アナログスイッチＡＳ1 がオン、
アナログスイッチＡＳ 2 がオフの場合には、オペアンプ
ＯＰ1 の帰還抵抗Ｒｆと感温抵抗Ｒｔ1 とが直列接続さ
れて、これら帰還抵抗Ｒｆ及び感温抵抗Ｒｔ1 により増
幅回路６の増幅度が決まり、しかも、その増幅度は感温
抵抗Ｒｔ1 の抵抗温度変化率に応じた温度特性を有す
る。また、アナログスイッチＡＳ1 がオフ、アナログス
イッチＡＳ 2 がオンの場合には、帰還抵抗Ｒｆと感温抵
抗Ｒｔ2 とが直列接続されて、これら帰還抵抗Ｒｆ及び
感温抵抗Ｒｔ1 により増幅回路６の増幅度が決まり、し
かも、その増幅度は感温抵抗Ｒｔ2 の抵抗温度変化率に
応じた温度特性を有する。That is, the resistance value of the temperature detecting element 2 is the temperature.
Is changed to high or low from the comparator 9.
The binary voltage of is output and the output voltage of the comparator 9 is
Analog switch AS when high1Turned on, analog
Switch AS2Is off and the output voltage is low
Has an analog switch AS1Off, analog switch
AS2Turns on. Analog switch AS1Is on,
Analog switch AS 2Is off, op amp
OP1Feedback resistance Rf and temperature sensitive resistance Rt1And are connected in series
The feedback resistance Rf and the temperature sensitive resistance Rt1Increased by
The amplification degree of the width circuit 6 is determined, and the amplification degree is temperature sensitive.
Resistance Rt1Has temperature characteristics according to the rate of change in resistance temperature of
It Also, the analog switch AS1Off, analog
Itch AS 2When is on, the feedback resistance Rf and temperature
Anti-Rt2And are connected in series, these feedback resistors Rf and
Temperature-sensitive resistance Rt1The amplification degree of the amplifier circuit 6 is determined by
Maybe, the degree of amplification is the temperature sensitive resistance Rt.2To the resistance temperature change rate of
It has corresponding temperature characteristics.

【００３５】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、これらの増幅度は感温抵抗Ｒｔ1 ，Ｒ
ｔ2の抵抗温度変化率に応じた温度特性を持つから、低
温側領域と高温側領域で温度特性が異なるセンサの検出
出力に対して温度特性がほぼ一定となるような最適な補
正をかけることができる。しかも、増幅回路６が飽和し
てしまうような場合でも、温度補正部１により増幅度を
下げるように温度補正をかければ、光電センサ１１の出
力に対するダイナミックレンジの拡大と温度補正とが同
時に実現できる。なお、感温抵抗Ｒｔ1 ，Ｒｔ2 は、セ
ンサの検出出力の温度特性が正負いずれの場合もあるか
ら、センサが使用される場所の環境に応じて最適な補正
がかけれるように正温度係数，負温度係数のものを適宜
選択して使用すればよい。According to the above-mentioned configuration, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and these amplification degrees are the temperature sensitive resistors Rt 1 and Rt.
Since it has a temperature characteristic corresponding to the rate of change in the resistance temperature of t 2 , it is necessary to make an optimum correction so that the temperature characteristic is almost constant with respect to the detection output of the sensor having different temperature characteristics in the low temperature region and the high temperature region. You can Moreover, even when the amplifier circuit 6 is saturated, if temperature correction is performed by the temperature correction unit 1 so as to reduce the amplification degree, expansion of the dynamic range with respect to the output of the photoelectric sensor 11 and temperature correction can be realized at the same time. . Note that the temperature-sensitive resistors Rt 1 and Rt 2 may have positive or negative temperature characteristics of the detection output of the sensor, so that a positive temperature coefficient may be applied so that optimum correction can be applied according to the environment of the place where the sensor is used. The one with a negative temperature coefficient may be appropriately selected and used.

【００３６】（実施例５）図５は本発明の第５の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ5 は、ある特定の温度（変移点）より低温側では温度
による検出出力の変動がなく高温側でのみ温度により検
出出力が変動する温度特性を有する図１４に示したよう
なセンサの温度特性を補正するためのものである。な
お、本実施例の基本構成は実施例１のものと共通であ
り、共通する部分の説明は省略して本実施例の特徴とな
る部分についてのみ説明する。(Embodiment 5) FIG. 5 is a circuit block diagram showing a fifth embodiment of the present invention. The temperature correction circuit A 5 of the present embodiment is shown in FIG. 14 having a temperature characteristic in which the detection output does not fluctuate due to temperature on the lower temperature side than a certain specific temperature (transition point) and the detection output fluctuates only on the high temperature side. It is for correcting the temperature characteristic of such a sensor. The basic configuration of the present embodiment is common to that of the first embodiment, and the description of the common parts will be omitted and only the characteristic parts of the present embodiment will be described.

【００３７】本実施例の温度補正回路Ａ5 は、実施例１
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例１の温度補正回路Ａ1 と共通で
ある。The temperature correction circuit A 5 of this embodiment is the same as that of the first embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 1 of the first embodiment.

【００３８】本実施例の温度補正回路Ａ5 は、温度検出
素子２の検出温度が上記変移点より低温であった場合に
は、切換部３が切換信号により温度補正部１のトランジ
スタＱ1 をオンとし、トランジスタＱ2 をオフとするこ
とにより、固定抵抗Ｒ1 ，Ｒ 2 が信号処理回路４に直列
接続される。この場合には信号処理回路４の元々の温度
特性は抵抗Ｒ2 が接続されることによっては殆ど影響を
受けることがない。Temperature correction circuit A of this embodimentFiveTemperature detection
When the detected temperature of element 2 is lower than the above transition point
Is the transition of the temperature correction unit 1 by the switching unit 3 by the switching signal.
Star Q1To turn on the transistor Q2To turn off
Fixed resistance R1, R 2In series with the signal processing circuit 4
Connected. In this case, the original temperature of the signal processing circuit 4
Characteristic is resistance R2Is almost affected by the connection of
Never receive.

【００３９】一方、温度検出素子２の検出温度が変移点
より高温であった場合には、切換部３は切換信号により
温度補正部１のトランジスタＱ1 をオフとしトランジス
タＱ 2 をオンとすることにより、固定抵抗Ｒ1 と感温抵
抗Ｒｔ2 の直列接続による合成抵抗で決まる補正係数の
温度補正を信号処理回路４にかけることができる。すな
わち、本実施例では、切換部３によって温度補正制御手
段を構成し、温度検出素子２の検出温度が変移点より高
温であった場合にのみ、温度補正部１による温度補正を
かけるようにしているのである。On the other hand, the detected temperature of the temperature detecting element 2 is a transition point.
When the temperature is higher, the switching unit 3 sends a switching signal.
Transistor Q of temperature correction unit 11Turn off and transis
Q 2By turning on the fixed resistor R1And temperature sensitivity
Anti-Rt2Of the correction coefficient determined by the combined resistance of the series connection of
The temperature correction can be applied to the signal processing circuit 4. sand
That is, in this embodiment, the temperature correction control operation is performed by the switching unit 3.
The temperature detected by the temperature detection element 2 is higher than the transition point.
Only when the temperature is high, the temperature correction unit 1 should correct the temperature.
I am trying to call it.

【００４０】上述の構成では、温度検出素子２による検
出温度に応じて上記変移点より低温側では信号処理回路
４に固定抵抗Ｒ2 を接続し、変移点より高温側では信号
処理回路４に感温抵抗Ｒｔ2 を接続するように切換部３
により切り換えるので、低温側領域では温度補正をかけ
ず、高温側では高温側領域の温度補正に適した補正係数
をかけることができ、低温側領域が略平坦な温度特性で
且つ高温側領域で平坦でない温度特性を有するセンサの
検出出力に対して温度特性がほぼ一定なるような最適な
補正をかけることができる。なお、感温抵抗Ｒｔ2 は、
センサの検出出力の温度特性が正負いずれの場合もある
から、センサが使用される場所の環境に応じて最適な補
正がかけれるように正温度係数，負温度係数のものを適
宜選択して使用すればよい。In the above configuration, the fixed resistor R 2 is connected to the signal processing circuit 4 on the temperature lower side than the transition point according to the temperature detected by the temperature detecting element 2, and the signal processing circuit 4 senses on the temperature side higher than the transition point. Switching unit 3 to connect temperature resistance Rt 2
Since it is switched by, the correction coefficient suitable for the temperature correction of the high temperature side can be applied on the high temperature side without performing the temperature correction on the low temperature side, and the low temperature side area has a substantially flat temperature characteristic and the high temperature side area is flat. Optimal correction can be applied to the detection output of the sensor having a non-uniform temperature characteristic such that the temperature characteristic is substantially constant. The temperature sensitive resistance Rt 2 is
Depending on the environment where the sensor is used, the temperature characteristics of the detection output of the sensor may be positive or negative. Therefore, select the one with positive temperature coefficient or negative temperature coefficient as appropriate so that the optimum correction can be applied depending on the environment where the sensor is used. do it.

【００４１】（実施例６）図６は本発明の第６の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ6 は、実施例５と同じくある特定の温度（変移点）よ
り低温側では温度による検出出力の変動がなく高温側で
のみ温度により検出出力が変動する温度特性を有する図
１４に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例２のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 6) FIG. 6 is a circuit block diagram showing a sixth embodiment of the present invention. The temperature correction circuit A 6 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate due to temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates on the high temperature side only, as in the fifth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of this embodiment is the same as that of the second embodiment, and the description of the common portions will be omitted and only the characteristic features of this embodiment will be described.

【００４２】本実施例の温度補正回路Ａ6 は、実施例２
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例２の温度補正回路Ａ2 と共通で
ある。The temperature correction circuit A 6 of this embodiment is the same as that of the second embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 2 of the second embodiment.

【００４３】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、低温側領域における
基準電圧Ｖｒ1 は温度により殆ど変動せず、且つ基準電
圧Ｖｒ2 は感温抵抗Ｒｔ2 の抵抗温度変化率に応じた温
度特性を持つから、低温側領域では温度補正をかけず、
高温側では高温側領域の温度補正に適した補正係数をか
けることができ、低温側領域が略平坦な温度特性で且つ
高温側領域で平坦でない温度特性を有するセンサの検出
出力に対して温度特性がほぼ一定となるような最適な補
正をかけることができる。また、実施例３のように複数
のセンサの出力を差動増幅して検出出力を得るような場
合でもセンサ毎に温度補正部１及び切換部３を設ける必
要がなく、複数のセンサにも容易に対応することができ
る。なお、感温抵抗Ｒｔ2 は、センサの検出出力の温度
特性が正負いずれの場合もあるから、センサが使用され
る場所の環境に応じて最適な補正がかけれるように正温
度係数，負温度係数のものを適宜選択して使用すればよ
い。According to the above-mentioned structure, the reference voltage Vr 1 of the comparison circuit 7 in the region on the low temperature side and the region on the high temperature side from the transition point,
Since Vr 2 is switched, the reference voltage Vr 1 in the low temperature region hardly changes with temperature, and the reference voltage Vr 2 has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 2 . Do not apply temperature correction in the low temperature range,
On the high temperature side, a correction coefficient suitable for temperature correction of the high temperature side area can be applied, and the temperature characteristics are detected with respect to the detection output of the sensor having a temperature characteristic that the low temperature side area has a substantially flat temperature characteristic and that the high temperature side area does not have a flat temperature characteristic. It is possible to apply the optimum correction so that is almost constant. Further, even in the case where the outputs of a plurality of sensors are differentially amplified to obtain the detection output as in the third embodiment, it is not necessary to provide the temperature correction unit 1 and the switching unit 3 for each sensor, and it is easy for a plurality of sensors. Can correspond to. Since the temperature characteristic of the detection output of the sensor may be positive or negative in some cases, the temperature-sensitive resistor Rt 2 has a positive temperature coefficient and a negative temperature coefficient so that it can be optimally corrected according to the environment in which the sensor is used. A coefficient may be appropriately selected and used.

【００４４】（実施例７）図７は本発明の第７の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ7 は、実施例５と同じくある特定の温度（変移点）よ
り低温側では温度による検出出力の変動がなく高温側で
のみ温度により検出出力が変動する温度特性を有する図
１４に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例４のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 7) FIG. 7 is a circuit block diagram showing a seventh embodiment of the present invention. The temperature correction circuit A 7 according to the present embodiment has the same temperature characteristic that the detection output does not fluctuate with temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates with the temperature only on the high temperature side as in the fifth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of the present embodiment is common to that of the fourth embodiment, and the description of the common portions will be omitted and only the characteristic features of the present embodiment will be described.

【００４５】本実施例の温度補正回路Ａ7 は、実施例４
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例４の温度補正回路Ａ4 と共通で
ある。The temperature correction circuit A 7 of this embodiment is the same as that of the fourth embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 4 of the fourth embodiment.

【００４６】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、低温側領域における増幅度は温度によ
り殆ど変動せず、且つ高温側領域における増幅度は感温
抵抗Ｒｔ2 の抵抗温度変化率に応じた温度特性を持つか
ら、低温側領域では温度補正をかけず、高温側では高温
側領域の温度補正に適した補正をかけることができ、低
温側領域が略平坦な温度特性で且つ高温側領域で平坦で
ない温度特性を有するセンサの検出出力に対して温度特
性がぼほ一定なるような最適な補正をかけることができ
る。しかも、増幅回路６が飽和してしまうような場合で
も、温度補正部１により増幅度を下げるように温度補正
をかければ、光電センサ１１の出力に対するダイナミッ
クレンジの拡大と温度補正とが同時に実現できる。な
お、感温抵抗Ｒｔ2 は、センサの検出出力の温度特性が
正負いずれの場合もあるから、センサが使用される場所
の環境に応じて最適な補正がかけれるように正温度係
数，負温度係数のものを適宜選択して使用すればよい。According to the above configuration, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and the amplification degree in the low temperature side area hardly changes depending on the temperature. Moreover, since the amplification degree in the high temperature side region has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 2 , temperature correction is not performed in the low temperature side region, and it is suitable for temperature correction in the high temperature side region in the high temperature side. It is possible to make corrections, and to perform optimum correction so that the temperature characteristics are almost constant with respect to the detection output of a sensor that has a temperature characteristic in which the low temperature side region has a substantially flat temperature characteristic and a high temperature side region has a non-flat temperature characteristic. You can Moreover, even when the amplifier circuit 6 is saturated, if temperature correction is performed by the temperature correction unit 1 so as to reduce the amplification degree, expansion of the dynamic range with respect to the output of the photoelectric sensor 11 and temperature correction can be realized at the same time. . Since the temperature characteristic of the detection output of the sensor may be positive or negative in some cases, the temperature-sensitive resistor Rt 2 has a positive temperature coefficient and a negative temperature coefficient so that it can be optimally corrected according to the environment in which the sensor is used. A coefficient may be appropriately selected and used.

【００４７】（実施例８）図８は本発明の第８の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ8 は、ある特定の温度（変移点）より高温側では温度
による検出出力の変動がなく低温側でのみ温度により検
出出力が変動する温度特性を有する図１５に示したよう
なセンサの温度特性を補正するためのものである。な
お、本実施例の基本構成は実施例１のものと共通であ
り、共通する部分の説明は省略して本実施例の特徴とな
る部分についてのみ説明する。(Embodiment 8) FIG. 8 is a circuit block diagram showing an eighth embodiment of the present invention. The temperature correction circuit A 8 of the present embodiment is shown in FIG. 15 having a temperature characteristic in which the detection output does not fluctuate on the high temperature side above a certain specific temperature (transition point) and the detection output fluctuates on the low temperature side only. It is for correcting the temperature characteristic of such a sensor. The basic configuration of the present embodiment is common to that of the first embodiment, and the description of the common parts will be omitted and only the characteristic parts of the present embodiment will be described.

【００４８】本実施例の温度補正回路Ａ8 は、実施例１
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ2 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より低
温側においてのみ感温抵抗Ｒｔ1 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例１の温度補正回路Ａ1 と共通で
ある。The temperature correction circuit A 8 of this embodiment is the same as that of the first embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt while the temperature sensitive resistor Rt 2 resistance temperature rate of change of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the low temperature side than the transition point It is characterized in that temperature correction is performed by the resistance temperature change rate of the resistor Rt 1 , and other configurations are common to the temperature correction circuit A 1 of the first embodiment.

【００４９】本実施例の温度補正回路Ａ8 は、温度検出
素子２の検出温度が上記変移点より高温であった場合に
は、切換部３が切換信号により温度補正部１のトランジ
スタＱ1 をオフとし、トランジスタＱ2 をオンとするこ
とにより、固定抵抗Ｒ1 ，Ｒ 2 が信号処理回路４に直列
接続される。この場合には信号処理回路４の元々の温度
特性は抵抗Ｒ2 が接続されることによっては殆ど影響を
受けることがない。Temperature correction circuit A of this embodiment8Temperature detection
When the detected temperature of element 2 is higher than the above transition point
Is the transition of the temperature correction unit 1 by the switching unit 3 by the switching signal.
Star Q1To turn off the transistor Q2Turn on
Fixed resistance R1, R 2In series with the signal processing circuit 4
Connected. In this case, the original temperature of the signal processing circuit 4
Characteristic is resistance R2Is almost affected by the connection of
Never receive.

【００５０】一方、温度検出素子２の検出温度が変移点
より低温であった場合には、切換部３は切換信号により
温度補正部１のトランジスタＱ1 をオンとしトランジス
タＱ 2 をオフとすることにより、固定抵抗Ｒ1 と感温抵
抗Ｒｔ1 の直列接続による合成抵抗で決まる補正係数の
温度補正を信号処理回路４にかけることができる。上述
の構成では、温度検出素子２による検出温度に応じて上
記変移点より高温側では信号処理回路４に固定抵抗Ｒ2
を接続し、変移点より低温側では信号処理回路４に感温
抵抗Ｒｔ1 を接続するように切換部３により切り換える
ので、高温側領域では温度補正をかけず、低温側でのみ
低温側領域の温度補正に適した補正係数の補正をかける
ことができ、高温側領域が略平坦な温度特性で且つ低温
側領域で平坦でない温度特性を有するセンサの検出出力
に対して温度特性がほぼ一定となるような最適な補正を
かけることができる。なお、感温抵抗Ｒｔ1 は、センサ
の検出出力の温度特性が正負いずれの場合もあるから、
センサが使用される場所の環境に応じて最適な補正がか
けれるように正温度係数，負温度係数のものを適宜選択
して使用すればよい。On the other hand, the detected temperature of the temperature detecting element 2 is a transition point.
When the temperature is lower, the switching unit 3 sends a switching signal.
Transistor Q of temperature correction unit 11Turn on and Transis
Q 2By turning off the1And temperature sensitivity
Anti-Rt1Of the correction coefficient determined by the combined resistance of the series connection of
The temperature correction can be applied to the signal processing circuit 4. Above
In the above configuration, depending on the temperature detected by the temperature detecting element 2,
A fixed resistor R is provided in the signal processing circuit 4 on the temperature side higher than the transition point.2
Connected to the signal processing circuit 4 at the temperature lower than the transition point.
Resistance Rt1Is switched by the switching unit 3 so as to connect
Therefore, temperature correction is not applied in the high temperature area, only in the low temperature area.
Apply a correction coefficient suitable for temperature correction in the low temperature region
The temperature characteristics of the high temperature region are almost flat and the temperature is low.
Detection output of a sensor with temperature characteristics that is not flat in the side region
Optimum correction so that the temperature characteristics are almost constant
You can call. The temperature-sensitive resistance Rt1Is the sensor
Since the temperature characteristics of the detection output of may be positive or negative,
There is an optimal correction depending on the environment where the sensor is used.
To select positive temperature coefficient and negative temperature coefficient appropriately
And use it.

【００５１】（実施例９）図９は本発明の第９の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ9 は、実施例８と同じくある特定の温度（変移点）よ
り高温側では温度による検出出力の変動がなく低温側で
のみ温度により検出出力が変動する温度特性を有する図
１５に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例２のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 9) FIG. 9 is a circuit block diagram showing a ninth embodiment of the present invention. The temperature correction circuit A 9 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate due to temperature on the higher temperature side than the specific temperature (transition point) and the detection output fluctuates on the low temperature side only as in the eighth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of this embodiment is the same as that of the second embodiment, and the description of the common portions will be omitted and only the characteristic features of this embodiment will be described.

【００５２】本実施例の温度補正回路Ａ9 は、実施例２
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ2 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より低
温側においてのみ感温抵抗Ｒｔ1 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例２の温度補正回路Ａ2 と共通で
ある。The temperature correction circuit A 9 of this embodiment is the same as that of the second embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt while the temperature sensitive resistor Rt 2 resistance temperature rate of change of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the low temperature side than the transition point It is characterized in that temperature correction is performed by the resistance temperature change rate of the resistance Rt 1 , and other configurations are common to the temperature correction circuit A 2 of the second embodiment.

【００５３】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、高温側領域における
基準電圧Ｖｒ2 は温度により殆ど変動せず、且つ低温側
領域における基準電圧Ｖｒ1は感温抵抗Ｒｔ1 の抵抗温
度変化率に応じた温度特性を持つから、高温側領域では
温度補正をかけず、低温側では低温側領域の温度補正に
適した補正係数による温度補正をかけることができ、高
温側領域が略平坦な温度特性で且つ低温側領域で平坦で
ない温度特性を有するセンサの検出出力に対して温度特
性がほぼ一定となるような最適な補正をかけることがで
きる。また、実施例３のように複数のセンサの出力を差
動増幅して検出出力を得るような場合でもセンサ毎に温
度補正部１及び切換部３を設ける必要がなく、複数のセ
ンサにも容易に対応することができる。なお、感温抵抗
Ｒｔ1 は、センサの検出出力の温度特性が正負いずれの
場合もあるから、センサが使用される場所の環境に応じ
て最適な補正がかけれるように正温度係数，負温度係数
のものを適宜選択して使用すればよい。According to the above-mentioned structure, the reference voltage Vr 1 of the comparison circuit 7 in the region on the low temperature side and the region on the high temperature side from the transition point,
Vr 2 is switched, the reference voltage Vr 2 in the high temperature region hardly changes with temperature, and the reference voltage Vr 1 in the low temperature region has a temperature characteristic corresponding to the resistance temperature change rate of the temperature sensitive resistor Rt 1. Therefore, it is possible to perform temperature correction using a correction coefficient suitable for temperature correction of the low temperature side region on the low temperature side without performing temperature correction on the high temperature side region, and the high temperature side region has a substantially flat temperature characteristic and the low temperature side region. Optimal correction can be applied to the detection output of the sensor having a temperature characteristic that is not flat in the region so that the temperature characteristic is substantially constant. Further, even in the case where the outputs of a plurality of sensors are differentially amplified to obtain the detection output as in the third embodiment, it is not necessary to provide the temperature correction unit 1 and the switching unit 3 for each sensor, and it is easy for a plurality of sensors. Can correspond to. Since the temperature characteristic of the detection output of the sensor may be positive or negative, the temperature-sensitive resistor Rt 1 has a positive temperature coefficient and a negative temperature coefficient so as to be optimally corrected according to the environment of the place where the sensor is used. A coefficient may be appropriately selected and used.

【００５４】（実施例１０）図１０は本発明の第１０の
実施例を示す回路ブロック図である。本実施例の温度補
正回路Ａ10は、実施例８と同じくある特定の温度（変移
点）より低温側では温度による検出出力の変動がなく高
温側でのみ温度により検出出力が変動する温度特性を有
する図１５に示したようなセンサの温度特性を補正する
ためのものである。なお、本実施例の基本構成は実施例
４のものと共通であり、共通する部分の説明は省略して
本実施例の特徴となる部分についてのみ説明する。本実
施例の温度補正回路Ａ10は、実施例４の構成において、
２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうちの一方の感温抵抗
Ｒｔ2 を抵抗温度変化率が極めて小さい固定抵抗Ｒ2 に
置き換えることにより、変移点より低温側においてのみ
感温抵抗Ｒｔ1 の抵抗温度変化率による温度補正をかけ
ている点に特徴があり、それ以外の他の構成については
実施例４の温度補正回路Ａ4 と共通である。(Embodiment 10) FIG. 10 is a circuit block diagram showing a tenth embodiment of the present invention. The temperature correction circuit A 10 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate with temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates with the temperature only on the high temperature side as in the eighth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of the present embodiment is common to that of the fourth embodiment, and the description of the common portions will be omitted and only the characteristic features of the present embodiment will be described. The temperature correction circuit A 10 of this embodiment has the same configuration as that of the fourth embodiment.
By replacing two temperature sensitive resistors Rt 1, one of the temperature sensitive resistor Rt 2 of Rt 2 to the resistance temperature coefficient is extremely small fixed resistor R 2, only the temperature-sensitive resistor Rt 1 in the low temperature side than the transition point It is characterized in that the temperature is corrected by the rate of change in resistance temperature, and other configurations are common to the temperature correction circuit A 4 of the fourth embodiment.

【００５５】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、高温側領域における増幅度は温度によ
り殆ど変動せず、且つ低温側領域における増幅度は感温
抵抗Ｒｔ1 の抵抗温度変化率に応じた温度特性を持つか
ら、高温側領域では温度補正をかけず、低温側では低温
側領域の温度補正に適した補正係数をかけることがで
き、高温側領域が略平坦な温度特性で且つ低温側領域で
平坦でない温度特性を有するセンサの検出出力に対して
温度特性がほぼ一定となるような最適な補正をかけるこ
とができる。しかも、増幅回路６が飽和してしまうよう
な場合でも、温度補正部１により増幅度を下げるように
温度補正をかければ、光電センサ１１の出力に対するダ
イナミックレンジの拡大と温度補正とが同時に実現でき
る。なお、感温抵抗Ｒｔ1 は、センサの検出出力の温度
特性が正負いずれの場合もあるから、センサが使用され
る場所の環境に応じて最適な補正がかけれるように正温
度係数，負温度係数のものを適宜選択して使用すればよ
い。According to the above configuration, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and the amplification degree in the high temperature side area hardly changes depending on the temperature. Moreover, since the amplification degree in the low temperature side region has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 1 , temperature correction is not performed in the high temperature side region, and it is suitable for temperature correction in the low temperature side region in the low temperature side. A correction coefficient can be applied, and optimum correction is performed so that the temperature characteristics are almost constant with respect to the detection output of a sensor having a temperature characteristic in which the high temperature side region is substantially flat and a temperature characteristic that is not flat in the low temperature side region. be able to. Moreover, even when the amplifier circuit 6 is saturated, if temperature correction is performed by the temperature correction unit 1 so as to reduce the amplification degree, expansion of the dynamic range with respect to the output of the photoelectric sensor 11 and temperature correction can be realized at the same time. . Since the temperature characteristic of the detection output of the sensor may be positive or negative, the temperature-sensitive resistor Rt 1 has a positive temperature coefficient and a negative temperature coefficient so as to be optimally corrected according to the environment of the place where the sensor is used. A coefficient may be appropriately selected and used.

【００５６】[0056]

【発明の効果】請求項１の発明は、温度により検出出力
が変動する温度特性を有するとともにある特定の温度よ
り高温側と低温側とで温度特性が異なるセンサの温度特
性を補正する温度補正回路であって、高温側の温度特性
を補正するための高温側補正係数及び低温側の温度特性
を補正するための低温側補正係数が切り換えられてセン
サの温度特性を補正する温度補正部と、温度を検出する
温度検出素子と、温度検出素子の検出温度に基づいて温
度補正部における補正係数を切り換える切換部とを備え
たので、温度検出素子により検出した温度が上記特定の
温度より高温の場合には、切換部により温度補正部にお
ける補正係数が高温側の補正係数に切り換えられ、反対
に上記特定の温度より低温の場合には、切換部により温
度補正部における補正係数が低温側の補正係数に切り換
えられるため、ある特定の温度より高温側と低温側とで
温度特性が異なるセンサの検出出力の温度特性がほぼ一
定となるような適切な補正をかけることができ、センサ
の使い勝手を向上させることができるという効果があ
る。According to the first aspect of the present invention, the temperature correction circuit corrects the temperature characteristic of the sensor which has a temperature characteristic in which the detection output fluctuates depending on the temperature and has different temperature characteristics on the high temperature side and the low temperature side of a certain specific temperature. A temperature correction unit for correcting the temperature characteristic of the sensor by switching between the high temperature side correction coefficient for correcting the high temperature side temperature characteristic and the low temperature side correction coefficient for correcting the low temperature side temperature characteristic; Since the temperature detection element for detecting the temperature and the switching unit for switching the correction coefficient in the temperature correction unit based on the detected temperature of the temperature detection element are provided, when the temperature detected by the temperature detection element is higher than the specific temperature. The switching unit switches the correction coefficient in the temperature correction unit to the correction coefficient on the high temperature side. On the contrary, when the temperature is lower than the specific temperature, the switching unit switches the temperature correction unit. Since the positive coefficient is switched to the correction coefficient on the low temperature side, it is possible to apply appropriate correction so that the temperature characteristics of the detection output of the sensor, which have different temperature characteristics on the high temperature side and low temperature side of a certain temperature, are almost constant. Therefore, the usability of the sensor can be improved.

【００５７】請求項２の発明は、温度補正部はセンサの
出力を信号処理して検出出力を得る信号処理部の温度特
性を補正するため、補正を容易に行うことができるとい
う効果がある。請求項３の発明は、温度補正部はセンサ
の出力を所定の基準値と比較して検出出力を得る比較部
の基準値の温度特性を補正するため、複数のセンサの出
力を差動増幅して検出出力を得るような場合でもセンサ
毎に温度補正部及び切換部を設ける必要がなく、複数の
センサにも容易に対応することができるという効果があ
る。According to the second aspect of the present invention, since the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain the detected output, the correction can be easily performed. According to the invention of claim 3, the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value. Therefore, the outputs of the plurality of sensors are differentially amplified. Even if a detection output is obtained by using the above-described method, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００５８】請求項４の発明は、温度補正部はセンサの
出力を増幅する増幅部の温度特性を補正するため、増幅
部が飽和してしまうような場合でも増幅度を下げるよう
に温度補正をかければダイナミックレンジの拡大と温度
補正とが同時に実現できるという効果がある。請求項５
の発明は、ある特定の温度より低温側では温度による検
出出力の変動がなく高温側でのみ温度により検出出力が
変動する温度特性を有するセンサの温度特性を補正する
温度補正回路であって、高温側の温度特性を補正する温
度補正部と、温度を検出する温度検出素子と、温度検出
素子の検出出力が上記特定の温度より高いときにのみ温
度補正部を動作させる温度補正制御手段とを備えたの
で、温度検出素子により検出した温度が上記特定の温度
より低温の場合には温度補正部による温度補正が行われ
ず、反対に上記特定の温度より高温の場合には、温度補
正制御手段が温度補正部を制御してセンサの検出出力に
対する温度補正を行うため、ある特定の温度より低温側
では温度による検出出力の変動がなく高温側でのみ温度
により検出出力が変動する温度特性を有するセンサの検
出出力の温度特性がほぼ一定となるような適切な補正を
かけることができ、センサの使い勝手を向上させること
ができるという効果がある。According to the fourth aspect of the invention, since the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor, the temperature correction is performed so as to reduce the amplification degree even when the amplification unit is saturated. If so, there is an effect that the dynamic range can be expanded and the temperature can be corrected at the same time. Claim 5
The invention of (1) is a temperature correction circuit for correcting the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the low temperature side and the detection output fluctuates only on the high temperature side. A temperature correction unit that corrects the temperature characteristic on the side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. Therefore, if the temperature detected by the temperature detecting element is lower than the above specific temperature, the temperature correction unit does not perform temperature correction.On the contrary, if the temperature is higher than the above specific temperature, the temperature correction control means changes the temperature. Since the temperature of the detection output of the sensor is corrected by controlling the compensator, the detection output does not fluctuate due to temperature on the lower temperature side than a certain temperature, but the detection output changes on the high temperature side only. Temperature characteristics of the detection output of the sensor having a temperature characteristic that it is possible to apply a substantially constant and so as a proper correction, there is an effect that it is possible to improve the usability of the sensor.

【００５９】請求項６の発明は、温度補正部はセンサの
出力を信号処理して検出出力を得る信号処理部の温度特
性を補正するので、補正を容易に行うことができるとい
う効果がある。請求項７の発明は、温度補正部はセンサ
の出力を所定の基準値と比較して検出出力を得る比較部
の基準値の温度特性を補正するので、複数のセンサの出
力を差動増幅して検出出力を得るような場合でもセンサ
毎に温度補正部及び切換部を設ける必要がなく、複数の
センサにも容易に対応することができるという効果があ
る。According to the sixth aspect of the present invention, since the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain the detected output, the correction can be easily performed. According to the invention of claim 7, since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value, the outputs of the plurality of sensors are differentially amplified. Even if a detection output is obtained by using the above-described method, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００６０】請求項８の発明は、温度補正部はセンサの
出力を増幅する増幅部の温度特性を補正するので、増幅
部が飽和してしまうような場合でも増幅度を下げるよう
に温度補正をかければダイナミックレンジの拡大と温度
補正とが同時に実現できるという効果がある。請求項９
の発明は、ある特定の温度より高温側では温度による検
出出力の変動がなく低温側でのみ温度により検出出力が
変動する温度特性を有するセンサの温度特性を補正する
温度補正回路であって、低温側の温度特性を補正する温
度補正部と、温度を検出する温度検出素子と、温度検出
素子の検出出力が上記特定の温度より低いときにのみ温
度補正部を動作させる温度補正制御手段とを備えたの
で、温度検出素子により検出した温度が上記特定の温度
より高温の場合には温度補正部による温度補正が行われ
ず、反対に上記特定の温度より低温の場合には、温度補
正制御手段が温度補正部を制御してセンサの検出出力に
対する温度補正を行うため、ある特定の温度より高温側
では温度による検出出力の変動がなく低温側でのみ温度
により検出出力が変動する温度特性を有するセンサの検
出出力の温度特性がほぼ一定となるような適切な補正を
かけることができ、センサの使い勝手を向上させること
ができるという効果がある。In the eighth aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. Therefore, even when the amplification unit is saturated, the temperature correction is performed so as to reduce the amplification degree. If so, there is an effect that the expansion of the dynamic range and the temperature correction can be realized at the same time. Claim 9
The invention of (1) is a temperature correction circuit for correcting the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to the temperature on the high temperature side and the detection output fluctuates only on the low temperature side. A temperature correction unit that corrects the temperature characteristic on the side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. Therefore, if the temperature detected by the temperature detection element is higher than the above specific temperature, the temperature correction unit does not perform temperature correction, and conversely, if the temperature is lower than the above specific temperature, the temperature correction control means changes the temperature. Since the temperature of the detection output of the sensor is corrected by controlling the correction unit, the detection output does not fluctuate due to temperature on the high temperature side above a certain temperature, and the detection output changes on the low temperature side only depending on the temperature. Temperature characteristics of the detection output of the sensor having a temperature characteristic that it is possible to apply a substantially constant and so as a proper correction, there is an effect that it is possible to improve the usability of the sensor.

【００６１】請求項１０の発明は、温度補正部はセンサ
の出力を信号処理して検出出力を得る信号処理部の温度
特性を補正するので、補正を容易に行うことができると
いう効果がある。請求項１１の発明は、温度補正部はセ
ンサの出力を所定の基準値と比較して検出出力を得る比
較部の基準値の温度特性を補正するので、複数のセンサ
の出力を差動増幅して検出出力を得るような場合でもセ
ンサ毎に温度補正部及び切換部を設ける必要がなく、複
数のセンサにも容易に対応することができるという効果
がある。According to the tenth aspect of the invention, since the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain the detected output, the correction can be easily performed. According to the invention of claim 11, since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value, the outputs of the plurality of sensors are differentially amplified. Even if a detection output is obtained by using the above-described method, it is not necessary to provide a temperature correction unit and a switching unit for each sensor, and it is possible to easily handle a plurality of sensors.

【００６２】請求項１２の発明は、温度補正部はセンサ
の出力を増幅する増幅部の温度特性を補正するので、増
幅部が飽和してしまうような場合でも増幅度を下げるよ
うに温度補正をかければダイナミックレンジの拡大と温
度補正とが同時に実現できるという効果がある。According to the twelfth aspect of the present invention, the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. If so, there is an effect that the expansion of the dynamic range and the temperature correction can be realized at the same time.

【図面の簡単な説明】[Brief description of drawings]

【図１】実施例１を示す回路ブロック図である。FIG. 1 is a circuit block diagram showing a first embodiment.

【図２】実施例２を示す回路ブロック図である。FIG. 2 is a circuit block diagram showing a second embodiment.

【図３】実施例３を示す回路ブロック図である。FIG. 3 is a circuit block diagram showing a third embodiment.

【図４】実施例４を示す回路ブロック図である。FIG. 4 is a circuit block diagram showing a fourth embodiment.

【図５】実施例５を示す回路ブロック図である。FIG. 5 is a circuit block diagram showing a fifth embodiment.

【図６】実施例６を示す回路ブロック図である。FIG. 6 is a circuit block diagram showing a sixth embodiment.

【図７】実施例７を示す回路ブロック図である。FIG. 7 is a circuit block diagram showing a seventh embodiment.

【図８】実施例８を示す回路ブロック図である。FIG. 8 is a circuit block diagram showing an eighth embodiment.

【図９】実施例９を示す回路ブロック図である。FIG. 9 is a circuit block diagram showing a ninth embodiment.

【図１０】実施例１０を示す回路ブロック図である。FIG. 10 is a circuit block diagram showing a tenth embodiment.

【図１１】センサの温度特性を説明するための説明図で
ある。FIG. 11 is an explanatory diagram for explaining temperature characteristics of a sensor.

【図１２】センサの他の温度特性を説明するための説明
図である。FIG. 12 is an explanatory diagram for explaining another temperature characteristic of the sensor.

【図１３】センサのさらに他の温度特性を説明するため
の説明図である。FIG. 13 is an explanatory diagram for explaining still another temperature characteristic of the sensor.

【図１４】センサの別の温度特性を説明するための説明
図である。FIG. 14 is an explanatory diagram for explaining another temperature characteristic of the sensor.

【図１５】センサのさらに別の温度特性を説明するため
の説明図である。FIG. 15 is an explanatory diagram for explaining still another temperature characteristic of the sensor.

【符号の説明】[Explanation of symbols]

Ａ1 温度補正回路 １ 温度補正部 ２ 温度検出素子 ３ 切換部 ４ 信号処理回路 ５ 出力回路A 1 temperature correction circuit 1 temperature correction unit 2 temperature detection element 3 switching unit 4 signal processing circuit 5 output circuit

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成７年９月１１日[Submission date] September 11, 1995

【手続補正１】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】全文[Correction target item name] Full text

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【書類名】 明細書[Document name] Statement

【発明の名称】 センサの温度補正回路[Title of Invention] Temperature correction circuit for sensor

【特許請求の範囲】[Claims]

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、検出素子の出力に基づ
いて物体の存否や距離などを検出し、温度によって検出
距離が変動する温度特性を有したセンサについて、検出
距離の温度特性を補正して正しい検出距離を得ることが
できるようにするセンサの温度補正回路に関するもので
ある。The present invention is based on the output of a sensing element.
There detecting the like object existence and distance, detected by the temperature
Detects sensors with temperature characteristics that change distance
The present invention relates to a temperature correction circuit of a sensor that corrects a temperature characteristic of a distance to obtain a correct detection distance .

【０００２】[0002]

【従来の技術】従来より、光や超音波のような物理量を
電気信号に変換する各種検出素子を物体検出用に応用し
た光電スイッチ、近接スイッチあるいは超音波スイッチ
などのセンサがある。このような物体検出センサは、そ
の検出距離が周囲温度や検出素子自体の温度によって変
わってしまうことがある。すなわち、一定の距離にある
検出対象に対する検出距離が温度によって変動するので
ある。このような検出距離の温度特性が図１１のａに示
すように直線的な場合には、感温抵抗のような直線的な
温度係数を有する温度補正素子を用いることにより、比
較的容易に温度特性に補正をかけてその変化率を許容範
囲内に抑えることができる（同図のｂ参照）。2. Description of the Related Art Heretofore, there have been sensors such as photoelectric switches, proximity switches, and ultrasonic switches to which various detecting elements for converting physical quantities such as light and ultrasonic waves into electric signals are applied for object detection. Such things body detection sensor, the detection distance is sometimes changed by the temperature of the ambient temperature and the detection element itself. That is, the detection distance with respect to the detection target at a fixed distance varies depending on the temperature. When the temperature characteristic of such a detection distance is linear as shown in FIG. 11A, the temperature correction element having a linear temperature coefficient such as a temperature-sensitive resistor is used, so that the temperature can be relatively easily obtained. The rate of change can be suppressed within the allowable range by correcting the characteristic (see b in the figure).

【０００３】[0003]

【発明が解決しようとする課題】ところが、近年では検
出素子の出力を処理して検出距離を得る処理回路の複雑
化に伴い、検出距離の温度特性も処理回路を構成する種
々の回路素子の温度特性が複雑に絡み合うこととなっ
て、結果的に検出距離の温度特性が直線性を有しない場
合もでてきている。例えば、図１２のａに示すように、
ある特定の温度（温度特性の変移点）より高温側の領域
と低温側の領域とで温度特性が異なるセンサに温度補正
をかけて低温側の領域における変化率を許容範囲内に抑
えようとすると、高温側の領域における温度特性に補正
が効き過ぎて許容範囲を越えてしまう（同図のｂ参
照）。また、高温側の領域における変化率を許容範囲内
に抑えようとすると、今度は低温側の領域における温度
特性に補正を充分かけることができない。あるいは、図
１３に示すような温度特性を有したセンサに対しては高
温側、低温側のいずれの変化率も許容範囲内に抑えるよ
うな補正をかけることができない。The object of the invention is to be Solved However, in recent years test
Processing the output of the device out with the complexity of the processing circuit for obtaining a detection distance, the temperature characteristics of various circuit elements temperature characteristics of the detection distance also form processing circuit becomes the intertwined complex, resulting in There are cases where the temperature characteristic of the detection distance does not have linearity. For example, as shown in FIG.
If you try to suppress the rate of change in the low-temperature region within the allowable range by temperature-correcting a sensor that has different temperature properties in the high-temperature region and low-temperature region from a certain temperature (temperature characteristic transition point) , The temperature characteristics in the high temperature region are overcorrected and exceed the allowable range (see b in the same figure). If the rate of change in the high temperature region is kept within the allowable range, the temperature characteristics in the low temperature region cannot be sufficiently corrected this time. Alternatively, the sensor having the temperature characteristics as shown in FIG. 13 cannot be corrected so that the rate of change on both the high temperature side and the low temperature side falls within the allowable range.

【０００４】また、図１４のａに示すように、低温側領
域では温度特性が平坦、すなわち温度に対して検出距離
が変動せず、高温側領域で許容範囲を越える温度特性を
有するようなセンサもある。このようなセンサでは、低
温側領域には補正をかける必要がないが、高温側領域の
変化率を許容範囲内に抑えるために補正をかけると、本
来補正が必要でない低温側領域にも補正が効いてしま
い、低温側領域の変化率までも許容範囲を越えてしまう
ような場合がある（同図のｂ参照）。Further, as shown in FIG. 14a, the temperature characteristic is flat in the low temperature region, that is, the detection distance does not vary with temperature, and the temperature characteristic exceeds the allowable range in the high temperature region. There are also sensors that have. With such a sensor, it is not necessary to make corrections in the low temperature region, but if correction is performed in order to keep the rate of change in the high temperature region within the allowable range, it is possible to make corrections in the low temperature region where it is not necessary. In some cases, the effect is exerted, and the rate of change in the low temperature region also exceeds the allowable range (see b in the same figure).

【０００５】あるいは、図１５のａに示すように、高温
側領域では温度特性が平坦、すなわち温度に対して検出
距離が変動せず、低温側領域で許容範囲を越える温度特
性を有するようなセンサもある。このようなセンサで
は、高温側領域には補正をかける必要がないが、低温側
領域の変化率を許容範囲内に抑えるために温度特性に補
正をかけると、本来補正が必要でない高温側領域にも補
正が効いてしまい、高温側領域の変化率までも許容範囲
を越えてしまうような場合がある（同図のｂ参照）。Alternatively, as shown in FIG. 15A, the temperature characteristic is flat in the high temperature region, that is, the temperature characteristic is detected.
There is also a sensor in which the distance does not fluctuate and the temperature characteristic exceeds the allowable range in the low temperature region. With such a sensor, it is not necessary to make corrections in the high temperature region, but if the temperature characteristics are corrected in order to keep the rate of change in the low temperature region within the permissible range, it is possible to make corrections in the high temperature region that originally do not require correction. In some cases, the correction is effective, and the rate of change in the high temperature region also exceeds the allowable range (see b in the same figure).

【０００６】本発明は上記問題点の解決を目的とするも
のであり、種々の温度特性を有するセンサに最適な温度
補正をかけることができる温度補正回路を提供しようと
するものである。[0006] The present invention is aimed to solve the above problems, it is intended to provide a temperature compensation circuit which can be applied the optimum temperature correction sensor with different temperature characteristics.

【０００７】[0007]

【課題を解決するための手段】請求項１の発明は、上記
目的を達成するために、検出素子の出力に基づいて物体
の存否や距離などを検出し、温度により検出距離が変動
する温度特性を有するとともにある特定の温度より高温
側と低温側とで温度特性が異なるセンサの温度特性を補
正する温度補正回路であって、高温側の温度特性を補正
するための高温側補正係数及び低温側の温度特性を補正
するための低温側補正係数が切り換えられてセンサの温
度特性を補正する温度補正部と、温度を検出する温度検
出素子と、温度検出素子の検出温度に基づいて温度補正
部における補正係数を切り換える切換部とを備えたこと
を特徴とする。In order to achieve the above object, an object of the present invention is based on the output of a detection element.
A temperature correction circuit that detects the presence or absence of a sensor, the distance, etc., and has the temperature characteristics that the detection distance fluctuates depending on the temperature, and that corrects the temperature characteristics of the sensor that have different temperature characteristics on the high temperature side and low temperature side of a certain temperature A temperature correction unit for correcting the temperature characteristic of the sensor by switching between a high temperature side correction coefficient for correcting the high temperature side temperature characteristic and a low temperature side correction coefficient for correcting the low temperature side temperature characteristic, and detecting the temperature. It is characterized by comprising a temperature detecting element and a switching section for switching a correction coefficient in the temperature correcting section based on the temperature detected by the temperature detecting element.

【０００８】請求項２の発明は、請求項１の発明におい
て、センサは検出素子の出力を信号処理して検出距離を
得る信号処理部を備え、温度補正部が信号処理部の温度
特性を補正することを特徴とする。請求項３の発明は、
請求項１の発明において、センサは検出素子の出力を所
定の基準値と比較する比較部を備え、温度補正部が比較
部の基準値の温度特性を補正することを特徴とする。According to a second aspect of the present invention, in the first aspect of the invention, the sensor performs signal processing on the output of the detection element to detect the detection distance.
It is characterized in that it has a signal processing unit to obtain, and the temperature correction unit corrects the temperature characteristic of the signal processing unit. The invention of claim 3 is
In the invention of claim 1, the sensor detects the output of the detection element.
It is characterized in that the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit, which is provided with a comparison unit for comparing with a constant reference value .

【０００９】請求項４の発明は、請求項１の発明におい
て、センサは検出素子の出力を増幅する増幅部を備え、
温度補正部が増幅部の温度特性を補正することを特徴と
する。請求項５の発明は、上記目的を達成するために、
検出素子の出力に基づいて物体の存否や距離などを検出
し、ある特定の温度より低温側では温度による検出距離
の変動がなく高温側でのみ温度により検出距離が変動す
る温度特性を有するセンサの温度特性を補正する温度補
正回路であって、高温側の温度特性を補正する温度補正
部と、温度を検出する温度検出素子と、温度検出素子の
検出出力が上記特定の温度より高いときにのみ温度補正
部を動作させる温度補正制御手段とを備えたことを特徴
とする。According to a fourth aspect of the present invention, in the first aspect of the invention, the sensor includes an amplification section for amplifying the output of the detection element,
The temperature correction unit corrects the temperature characteristic of the amplification unit . In order to achieve the above object, the invention of claim 5 provides
Detects the presence or distance of an object based on the output of the detection element
And, in certain low-temperature side of the temperature to a temperature correction circuit for correcting the temperature characteristic of the sensor having the temperature characteristic detected distance by the temperature varies only variation without the high temperature side of the detection distance <br/> by temperature A temperature correction unit that corrects the temperature characteristic on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. It is characterized by having.

【００１０】請求項６の発明は、請求項５の発明におい
て、センサは検出素子の出力を信号処理して検出距離を
得る信号処理部を備え、温度補正部が信号処理部の温度
特性を補正することを特徴とする。請求項７の発明は、
請求項５の発明において、センサは検出素子の出力を所
定の基準値と比較する比較部を備え、温度補正部が比較
部の基準値の温度特性を補正することを特徴とする。According to a sixth aspect of the invention, in the fifth aspect of the invention, the sensor performs signal processing on the output of the detection element to detect the detection distance.
It is characterized in that it has a signal processing unit to obtain, and the temperature correction unit corrects the temperature characteristic of the signal processing unit. The invention of claim 7 is
In the invention of claim 5, the sensor outputs the output of the detection element.
It is characterized in that the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit, which is provided with a comparison unit for comparing with a constant reference value .

【００１１】請求項８の発明は、請求項５の発明におい
て、センサは検出素子の出力を増幅する増幅部を備え、
温度補正部が増幅部の温度特性を補正することを特徴と
する。請求項９の発明は、上記目的を達成するために、
検出素子の出力に基づいて物体の存否や距離などを検出
し、ある特定の温度より高温側では温度による検出距離
の変動がなく低温側でのみ温度により検出距離が変動す
る温度特性を有するセンサの温度特性を補正する温度補
正回路であって、低温側の温度特性を補正する温度補正
部と、温度を検出する温度検出素子と、温度検出素子の
検出出力が上記特定の温度より低いときにのみ温度補正
部を動作させる温度補正制御手段とを備えたことを特徴
とする。According to an eighth aspect of the invention, in the fifth aspect of the invention, the sensor includes an amplification section for amplifying the output of the detection element,
The temperature correction unit corrects the temperature characteristic of the amplification unit . In order to achieve the above object, the invention of claim 9 is
Detects the presence or distance of an object based on the output of the detection element
And, in certain temperature than the high temperature side to a temperature correction circuit for correcting the temperature characteristic of the sensor having the temperature characteristic detected distance by the temperature varies only at a low temperature side without variation of the detection distance <br/> by temperature A temperature correction unit for correcting the temperature characteristic on the low temperature side, a temperature detection element for detecting the temperature, and a temperature correction control unit for operating the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. It is characterized by having.

【００１２】請求項１０の発明は、請求項９の発明にお
いて、センサは検出素子の出力を信号処理して検出距離
を得る信号処理部を備え、温度補正部が信号処理部の温
度特性を補正することを特徴とする。請求項１１の発明
は、請求項９の発明において、センサは検出素子の出力
を所定の基準値と比較する比較部を備え、温度補正部が
比較部の基準値の温度特性を補正することを特徴とす
る。According to a tenth aspect of the present invention, in the ninth aspect of the invention, the sensor performs signal processing on the output of the detection element to detect the detection distance.
Is provided, and the temperature correction unit corrects the temperature characteristic of the signal processing unit. In the invention of claim 11, in the invention of claim 9, the sensor is an output of the detection element.
Is provided with a comparison unit for comparing with a predetermined reference value, and the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit.

【００１３】請求項１２の発明は、請求項９の発明にお
いて、センサは検出素子の出力を増幅する増幅部を備
え、温度補正部が増幅部の温度特性を補正することを特
徴とする。According to a twelfth aspect of the present invention, in the ninth aspect of the invention, the sensor includes an amplifying section for amplifying the output of the detecting element.
The temperature correction unit corrects the temperature characteristic of the amplification unit .

【００１４】[0014]

【作用】請求項１の発明の構成では、検出素子の出力に
基づいて物体の存否や距離などを検出し、温度により検
出距離が変動する温度特性を有するとともにある特定の
温度より高温側と低温側とで温度特性が異なるセンサの
温度特性を補正する温度補正回路であって、高温側の温
度特性を補正するための高温側補正係数及び低温側の温
度特性を補正するための低温側補正係数が切り換えられ
てセンサの温度特性を補正する温度補正部と、温度を検
出する温度検出素子と、温度検出素子の検出温度に基づ
いて温度補正部における補正係数を切り換える切換部と
を備えたので、温度検出素子により検出した温度が上記
特定の温度より高温の場合には、切換部により温度補正
部における補正係数が高温側の補正係数に切り換えら
れ、反対に上記特定の温度より低温の場合には、切換部
により温度補正部における補正係数が低温側の補正係数
に切り換えられるため、ある特定の温度より高温側と低
温側とで温度特性が異なるセンサの温度特性がほぼ一定
となるような適切な補正をかけることができる。In the configuration of the invention of claim 1, the output of the detection element is
Based detects such object existence and distance, detection by the temperature
A temperature correction circuit that corrects the temperature characteristics of a sensor that has temperature characteristics in which the outgoing distance fluctuates and that has different temperature characteristics on the high temperature side and low temperature side of a certain temperature, and that corrects the temperature characteristics of the high temperature side. A high temperature side correction coefficient and a low temperature side correction coefficient for correcting the low temperature side temperature coefficient are switched to correct the temperature characteristic of the sensor, a temperature detecting element for detecting the temperature, and a temperature detected by the temperature detecting element. And a switching unit that switches the correction coefficient in the temperature correction unit based on the above, when the temperature detected by the temperature detection element is higher than the specific temperature, the switching unit causes the correction coefficient in the temperature correction unit to be on the high temperature side. When the temperature is lower than the specific temperature, the switching unit switches the correction coefficient in the temperature correction unit to the correction coefficient on the low temperature side. Can temperature characteristics of a temperature characteristic differs from a certain temperature and the high temperature side and low temperature side sensor exerts a substantially constant become such appropriate correction.

【００１５】請求項２の発明の構成では、センサは検出
素子の出力を信号処理して検出距離を得る信号処理部を
備え、温度補正部が信号処理部の温度特性を補正するた
め、補正を容易に行うことができる。請求項３の発明の
構成では、センサは検出素子の出力を所定の基準値と比
較する比較部を備え、温度補正部が比較部の基準値の温
度特性を補正するため、複数の検出素子の出力を差動増
幅して検出距離を得るような場合でも検出素子毎に温度
補正部及び切換部を設ける必要がなく、複数の検出素子
を備えるセンサにも容易に対応することができる。In the configuration of the invention of claim 2, the sensor detects
A signal processing unit that processes the output of the element to obtain the detection distance
Since the temperature correction unit corrects the temperature characteristic of the signal processing unit, the correction can be easily performed. In the structure of the invention of claim 3, the sensor compares the output of the detection element with a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit , the temperature correction is performed for each detection element even when the detection distance is obtained by differentially amplifying the outputs of multiple detection elements. It is not necessary to provide a detector and a switching unit, and a plurality of detection elements
It is possible to easily deal with a sensor provided with .

【００１６】請求項４の発明の構成では、センサは検出
素子の出力を増幅する増幅部を備え、温度補正部が増幅
部の温度特性を補正するため、増幅部が飽和してしまう
ような場合でも増幅度を下げるように温度補正をかけれ
ばダイナミックレンジの拡大と温度補正とが同時に実現
できる。請求項５の発明の構成では、検出素子の出力に
基づいて物体の存否や距離などを検出し、ある特定の温
度より低温側では温度による検出距離の変動がなく高温
側でのみ温度により検出距離が変動する温度特性を有す
るセンサの温度特性を補正する温度補正回路であって、
高温側の温度特性を補正する温度補正部と、温度を検出
する温度検出素子と、温度検出素子の検出出力が上記特
定の温度より高いときにのみ温度補正部を動作させる温
度補正制御手段とを備えたので、温度検出素子により検
出した温度が上記特定の温度より低温の場合には温度補
正部による温度補正が行われず、反対に上記特定の温度
より高温の場合には、温度補正制御手段が温度補正部を
制御してセンサに対する温度補正を行うため、ある特定
の温度より低温側では温度による検出距離の変動がなく
高温側でのみ温度により検出距離が変動する温度特性を
有するセンサの温度特性がほぼ一定となるような適切な
補正をかけることができる。In the structure of the invention of claim 4, the sensor detects
Equipped with an amplification unit that amplifies the output of the element, the temperature correction unit amplifies
Since the temperature characteristics of the part are corrected, the dynamic range can be expanded and the temperature can be corrected at the same time by performing the temperature correction so as to reduce the amplification degree even when the amplification part is saturated. In the configuration of the invention of claim 5, the output of the detection element is
The presence or absence of an object or the distance is detected based on it, and the temperature characteristic of the sensor has the temperature characteristic that the detection distance does not fluctuate with temperature on the low temperature side and the detection distance fluctuates only on the high temperature side. A temperature correction circuit,
A temperature correction unit that corrects the temperature characteristic on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. Therefore, if the temperature detected by the temperature detecting element is lower than the specific temperature, the temperature correction unit does not perform temperature correction, and conversely, if the temperature is higher than the specific temperature, the temperature correction control means for temperature compensation against the sensor by controlling the temperature compensation unit, the sensor having a temperature characteristic that the detection distance varies with temperature only in a certain variation without the high temperature side of the detection distance with temperature on the low temperature side than the specified temperature temperature characteristics can apply a substantially constant and so as a proper correction.

【００１７】請求項６の発明の構成では、センサは検出
素子の出力を信号処理して検出距離を得る信号処理部を
備え、温度補正部が信号処理部の温度特性を補正するの
で、補正を容易に行うことができる。請求項７の発明の
構成では、センサは検出素子の出力を所定の基準値と比
較する比較部を備え、温度補正部が比較部の基準値の温
度特性を補正するので、複数の検出素子の出力を差動増
幅して検出距離を得るような場合でも検出素子毎に温度
補正部及び切換部を設ける必要がなく、複数の検出素子
を備えるセンサにも容易に対応することができる。In the configuration of the invention of claim 6, the sensor detects
A signal processing unit that processes the output of the element to obtain the detection distance
Since the temperature correction unit corrects the temperature characteristic of the signal processing unit, the correction can be easily performed. In the configuration of the invention of claim 7, the sensor compares the output of the detection element with a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristics of the reference value of the comparison unit , the temperature correction is performed for each detection element even when the outputs of multiple detection elements are differentially amplified to obtain the detection distance. It is not necessary to provide a detector and a switching unit, and a plurality of detection elements
It is possible to easily deal with a sensor provided with .

【００１８】請求項８の発明の構成では、センサは検出
素子の出力を増幅する増幅部を備え、温度補正部が増幅
部の温度特性を補正するため、増幅部が飽和してしまう
ような場合でも増幅度を下げるように温度補正をかけれ
ばダイナミックレンジの拡大と温度補正とが同時に実現
できる。請求項９の発明の構成では、検出素子の出力に
基づいて物体の存否や距離などを検出し、ある特定の温
度より高温側では温度による検出距離の変動がなく低温
側でのみ温度により検出距離が変動する温度特性を有す
るセンサの温度特性を補正する温度補正回路であって、
低温側の温度特性を補正する温度補正部と、温度を検出
する温度検出素子と、温度検出素子の検出出力が上記特
定の温度より低いときにのみ温度補正部を動作させる温
度補正制御手段とを備えたので、温度検出素子により検
出した温度が上記特定の温度より高温の場合には温度補
正部による温度補正が行われず、反対に上記特定の温度
より低温の場合には、温度補正制御手段が温度補正部を
制御してセンサに対する温度補正を行うため、ある特定
の温度より高温側では温度による検出距離の変動がなく
低温側でのみ温度により検出距離が変動する温度特性を
有するセンサの温度特性がほぼ一定となるような適切な
補正をかけることができる。In the structure of the invention of claim 8, the sensor detects
Equipped with an amplification unit that amplifies the output of the element, the temperature correction unit amplifies
Since the temperature characteristics of the part are corrected, the dynamic range can be expanded and the temperature can be corrected at the same time by performing the temperature correction so as to reduce the amplification degree even when the amplification part is saturated. In the configuration of the invention of claim 9, the output of the detection element is
The presence or absence of an object or the distance is detected based on it, and the temperature characteristic of a sensor having temperature characteristics in which the detection distance does not change due to temperature on the higher temperature side than a certain temperature and the detection distance changes only on the low temperature side is corrected. A temperature correction circuit,
A temperature correction unit that corrects the temperature characteristic on the low temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. Therefore, if the temperature detected by the temperature detecting element is higher than the specific temperature, the temperature correction unit does not perform temperature correction, and conversely, if the temperature is lower than the specific temperature, the temperature correction control means for temperature compensation against the sensor by controlling the temperature compensation unit, the sensor having a temperature characteristic that the detection distance varies with temperature only at a certain low temperature side without variation of the detection distance by the temperature in the high temperature side than the specified temperature temperature characteristics can apply a substantially constant and so as a proper correction.

【００１９】請求項１０の発明の構成では、センサは検
出素子の出力を信号処理して検出距離を得る信号処理部
を備え、温度補正部が信号処理部の温度特性を補正する
ので、補正を容易に行うことができる。請求項１１の発
明の構成では、センサは検出素子の出力を所定の基準値
と比較する比較部を備え、温度補正部が比較部の基準値
の温度特性を補正するので、複数の検出素子の出力を差
動増幅して検出距離を得るような場合でも検出素子毎に
温度補正部及び切換部を設ける必要がなく、複数の検出
素子を備えるセンサにも容易に対応することができる。According to the tenth aspect of the invention, the sensor is not detected.
A signal processing unit that processes the output of the output element to obtain the detection distance
Since the temperature correction unit corrects the temperature characteristic of the signal processing unit, the correction can be easily performed. In the configuration of the invention of claim 11, the sensor outputs the output of the detection element to a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristics of the reference value of the comparison unit, even if the outputs of multiple detection elements are differentially amplified to obtain the detection distance , the temperature for each detection element is compared. Multiple detection without the need for a correction unit and switching unit
It is possible to easily deal with a sensor including an element .

【００２０】請求項１２の発明の構成では、センサは検
出素子の出力を増幅する増幅部を備え、温度補正部が増
幅部の温度特性を補正するため、増幅部が飽和してしま
うような場合でも増幅度を下げるように温度補正をかけ
ればダイナミックレンジの拡大と温度補正とが同時に実
現できる。According to the twelfth aspect of the invention, the sensor is not detected.
Equipped with an amplifier that amplifies the output of the output element
Since the temperature characteristic of the width portion is corrected, the dynamic range can be expanded and the temperature can be corrected at the same time by performing the temperature correction so as to reduce the amplification degree even when the amplification portion is saturated.

【００２１】[0021]

【実施例】 （実施例１）図１は本発明の第１の実施例を示す回路ブ
ロック図である。本実施例の温度補正回路Ａ1 は、ある
特定の温度（変移点）より高温側と低温側とで温度特性
が異なる図１２に示したようなセンサの温度特性を補正
するためのものである。すなわち、図示しない検出素子
からの出力を信号処理して検出距離を得る信号処理回路
４の温度特性を温度補正回路Ａ1 によって補正をかける
ものである。なお、５は信号処理回路４からの検出距離
に基づいてスイッチ等をオン・オフする出力回路であ
る。[Embodiment 1] FIG. 1 is a circuit block diagram showing a first embodiment of the present invention. The temperature correction circuit A 1 of this embodiment is for correcting the temperature characteristic of the sensor as shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side with respect to a certain specific temperature (transition point). . That is, the temperature correction circuit A 1 corrects the temperature characteristic of the signal processing circuit 4 that obtains the detection distance by processing the output from the detection element ( not shown). Reference numeral 5 is an output circuit for turning on and off switches and the like based on the detection distance from the signal processing circuit 4.

【００２２】温度補正回路Ａ1 は、信号処理回路４の温
度特性を補正する温度補正部１と、周囲温度や検出素子
自体の温度などを検出する感温抵抗から成る温度検出素
子２と、温度検出素子２による検出温度が上記変移点の
温度より高温か低温かを判別して切換信号を温度補正部
１に出力する切換部３とを備えている。温度補正部１
は、信号処理回路４に接続された固定抵抗Ｒ1 に感温抵
抗Ｒｔ1とトランジスタＱ1 の直列回路及び感温抵抗Ｒ
ｔ2 とトランジスタＱ2 の直列回路を並列に接続して構
成してある。そして、トランジスタＱ1 ，Ｑ2 は切換部
３からの切換信号によって選択的にオン・オフされる。The temperature correction circuit A 1 comprises a temperature correction unit 1 for correcting the temperature characteristic of the signal processing circuit 4 and a temperature detection element comprising a temperature sensitive resistor for detecting the ambient temperature and the temperature of the detection element itself. 2 and a switching unit 3 that determines whether the temperature detected by the temperature detection element 2 is higher or lower than the temperature at the transition point and outputs a switching signal to the temperature correction unit 1. Temperature correction unit 1
Is a series circuit of a temperature sensitive resistor Rt 1 and a transistor Q 1 connected to a fixed resistor R 1 connected to the signal processing circuit 4, and a temperature sensitive resistor R 1.
It is configured by connecting a series circuit of t 2 and a transistor Q 2 in parallel. The transistors Q 1 and Q 2 are selectively turned on / off by a switching signal from the switching unit 3.

【００２３】すなわち、温度検出素子２の検出温度が上
記変移点より低温であった場合には、切換部３は切換信
号により温度補正部１のトランジスタＱ1 をオンとし、
トランジスタＱ2 をオフとすることにより、固定抵抗Ｒ
1 と感温抵抗Ｒｔ1 の直列接続による合成抵抗で決まる
補正係数の温度補正を信号処理回路４にかけることがで
きる。一方、温度検出素子２の検出温度が変移点より高
温であった場合には、切換部３は切換信号により温度補
正部１のトランジスタＱ1 をオフとしトランジスタＱ2
をオンとすることにより、固定抵抗Ｒ1 と感温抵抗Ｒｔ
2 の直列接続による合成抵抗で決まる補正係数の温度補
正を信号処理回路４にかけることができる。That is, when the temperature detected by the temperature detecting element 2 is lower than the transition point, the switching unit 3 turns on the transistor Q 1 of the temperature correction unit 1 by the switching signal,
By turning off the transistor Q 2 , a fixed resistance R
The signal processing circuit 4 can be subjected to temperature correction with a correction coefficient determined by the combined resistance of 1 and the temperature-sensitive resistor Rt 1 connected in series. On the other hand, when the detected temperature of the temperature detecting element 2 is higher than the transition point, the switching unit 3 turns off the transistor Q 1 of the temperature correction unit 1 by the switching signal and turns off the transistor Q 2
By turning on, the fixed resistance R 1 and the temperature sensitive resistance Rt
It is possible to apply the temperature correction of the correction coefficient determined by the combined resistance of the two connected in series to the signal processing circuit 4.

【００２４】上述の構成では、温度検出素子２による検
出温度に応じて信号処理回路４に接続される感温抵抗Ｒ
ｔ1 ，Ｒｔ2 を切り換える切換部３を備えたので、接続
される感温抵抗Ｒｔ1 ，Ｒｔ2 によって低温側領域の温
度補正に適した補正係数と高温側領域の温度補正に適し
た補正係数とを選択することができ、低温側領域と高温
側領域で温度特性が異なるセンサに対して温度特性がぼ
ほ一定なるような最適な温度補正をかけることができ
る。なお、感温抵抗Ｒｔ1 ，Ｒｔ2 は、センサの検出距
離の温度特性が正負いずれの場合もあるから、センサが
使用される場所の環境に応じて最適な補正がかけれるよ
うに正温度係数，負温度係数のものを適宜選択して使用
すればよい。In the above configuration, the temperature sensitive resistor R connected to the signal processing circuit 4 according to the temperature detected by the temperature detecting element 2.
Since the switching unit 3 for switching between t 1 and Rt 2 is provided, the correction coefficient suitable for the temperature correction in the low temperature side region and the correction coefficient suitable for the temperature correction in the high temperature side region depending on the connected temperature sensitive resistors Rt 1 and Rt 2 . preparative can be selected, it is possible to apply optimum temperature correction such that the temperature characteristic at the low temperature side region and the high temperature side region temperature characteristic pot Ho becomes constant for the different sensors. The temperature-sensitive resistors Rt 1 and Rt 2 are the detection distances of the sensor.
Since the temperature characteristic of the separation may be positive or negative, the temperature coefficient of the positive temperature coefficient or the negative temperature coefficient may be appropriately selected and used so that the optimum correction can be applied according to the environment of the place where the sensor is used. .

【００２５】（実施例２）図２は本発明の第２の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ2 は、実施例１と同じくある特定の温度（変移点）よ
り高温側と低温側とで温度特性が異なる図１２に示した
ようなセンサの温度特性を補正するためのものである。
なお、本実施例における温度補正回路Ａ2 の基本構成は
実施例１のものと共通であり、共通する部分については
同一の符号を付して説明は省略する。また、本実施例で
は検出素子としてホトダイオード１１を備えた光電セン
サを例示しているが、これに限定するものではない。(Embodiment 2) FIG. 2 is a circuit block diagram showing a second embodiment of the present invention. The temperature correction circuit A 2 of the present embodiment corrects the temperature characteristics of the sensor as shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side with respect to a certain specific temperature (transition point) as in the first embodiment. It is for.
The basic configuration of the temperature correction circuit A 2 in this embodiment is the same as that of the first embodiment, and the common parts are denoted by the same reference numerals and the description thereof is omitted. Further, in this embodiment, a photoelectric sensor including the photodiode 11 as a detection element is used.
It is exemplified a service, not limited thereto.

【００２６】図２に示すように、本実施例では、オペア
ンプＯＰ1 を備えた増幅回路６で増幅されたホトダイオ
ード１１の出力電圧を比較回路７において基準電圧Ｖｒ
と比較し、比較回路７の出力を積分回路等の処理回路８
で処理して得られる出力（検出距離）を出力回路５に与
えており、温度補正回路Ａ2 は比較回路７の基準電圧Ｖ
ｒを温度検出素子２の検出温度に応じて変化させるもの
である。As shown in FIG. 2, in this embodiment, the output voltage of the photodiode 11 amplified by the amplifier circuit 6 having the operational amplifier OP 1 is applied to the reference voltage Vr in the comparison circuit 7.
The output of the comparison circuit 7 is compared with a processing circuit 8 such as an integration circuit.
The output (detection distance ) obtained by the processing is given to the output circuit 5, and the temperature correction circuit A 2 receives the reference voltage V of the comparison circuit 7.
r is changed according to the temperature detected by the temperature detecting element 2.

【００２７】本実施例の温度補正回路Ａ2 は、温度補正
部１を比較回路７の基準電圧Ｖｒが入力される側の端子
に接続してある。なお、切換部３は温度検出素子２によ
る分圧電圧を基準電圧と比較するコンパレータ９と、コ
ンパレータ９の出力を反転するインバータ１０とにより
構成してある。ここで、温度検出素子２の抵抗値が温度
によって変化すると、コンパレータ９からはハイ，ロー
の２値の電圧が出力される。コンパレータ９の出力電圧
がハイの場合にはトランジスタＱ1 がオフ、トランジス
タＱ2 がオンとなり、出力電圧がローの場合にはトラン
ジスタＱ1 がオン、トランジスタＱ2 がオフとなる。す
なわち、トランジスタＱ1 がオン、トランジスタＱ2 が
オフの場合には比較回路７には感温抵抗Ｒｔ1 が接続さ
れて基準電圧Ｖｒ1 が得られる。また、トランジスタＱ
1 がオフ、トランジスタＱ2 がオンの場合には比較回路
７に感温抵抗Ｒｔ2 が接続されて基準電圧Ｖｒ2 が得ら
れる。しかも、これらの基準電圧Ｖｒ1 ，Ｖｒ2 は感温
抵抗Ｒｔ1 ，Ｒｔ2 の抵抗温度変化率に応じた温度特性
を持つことになる。In the temperature correction circuit A 2 of this embodiment, the temperature correction unit 1 is connected to the terminal of the comparison circuit 7 on the side to which the reference voltage Vr is input. The switching unit 3 is composed of a comparator 9 that compares the divided voltage of the temperature detecting element 2 with a reference voltage, and an inverter 10 that inverts the output of the comparator 9. Here, when the resistance value of the temperature detection element 2 changes with temperature, the comparator 9 outputs a binary voltage of high and low. When the output voltage of the comparator 9 is high, the transistor Q 1 is off and the transistor Q 2 is on. When the output voltage is low, the transistor Q 1 is on and the transistor Q 2 is off. That is, when the transistor Q 1 is on and the transistor Q 2 is off, the temperature sensitive resistor Rt 1 is connected to the comparison circuit 7 and the reference voltage Vr 1 is obtained. Also, the transistor Q
When 1 is off and the transistor Q 2 is on, the temperature-sensitive resistor Rt 2 is connected to the comparison circuit 7 to obtain the reference voltage Vr 2 . Moreover, these reference voltages Vr 1 and Vr 2 have temperature characteristics corresponding to the resistance temperature change rates of the temperature sensitive resistors Rt 1 and Rt 2 .

【００２８】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、これら基準電圧Ｖｒ
1 ，Ｖｒ2 は感温抵抗Ｒｔ1 ，Ｒｔ2 の抵抗温度係数に
応じた温度特性を持つから、低温側領域と高温側領域で
温度特性が異なるセンサに対して温度特性がほぼ一定と
なるような最適な補正をかけることができる。なお、感
温抵抗Ｒｔ1 ，Ｒｔ2は、センサの検出距離の温度特性
が正負いずれの場合もあるから、センサが使用される場
所の環境に応じて最適な補正がかけれるように正温度係
数，負温度係数のものを適宜選択して使用すればよい。According to the above-mentioned structure, the reference voltage Vr 1 of the comparison circuit 7 in the region on the low temperature side and the region on the high temperature side from the transition point,
Vr 2 is switched, and these reference voltages Vr
Since 1, Vr 2 has a temperature characteristic corresponding to the resistance temperature coefficient of the temperature-sensitive resistor Rt 1, Rt 2, a substantially constant temperature characteristics for the temperature characteristics are different sensor on the low temperature side region and the high temperature side region Such an optimum correction can be applied. The temperature-sensitive resistors Rt 1 and Rt 2 may have positive or negative temperature characteristics of the detection distance of the sensor. Therefore, the positive temperature coefficient may be adjusted according to the environment where the sensor is used. The one with a negative temperature coefficient may be appropriately selected and used.

【００２９】（実施例３）図３は本発明の第３の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ3 は、実施例１，２と同じくある特定の温度（変移
点）より高温側と低温側とで温度特性が異なる図１２に
示したようなセンサの温度特性を補正するためのもので
ある。なお、本実施例における温度補正回路Ａ3 の基本
構成は実施例２のものと共通であり、共通する部分につ
いては同一の符号を付して説明は省略する。また、本実
施例では検出素子としてホトダイオード１１を備えた光
電センサを例示しているが、これに限定するものではな
い。(Embodiment 3) FIG. 3 is a circuit block diagram showing a third embodiment of the present invention. The temperature correction circuit A 3 of the present embodiment has the same temperature characteristic of the sensor as shown in FIG. It is for correction. The basic configuration of the temperature correction circuit A 3 in this embodiment is the same as that of the second embodiment, and the common parts are denoted by the same reference numerals and the description thereof will be omitted. Further, in the present embodiment, the light having the photodiode 11 as the detection element is used.
It is exemplified a photoelectric sensor, not limited thereto.

【００３０】図３に示すように、本実施例では、２つの
ホトダイオード１１1 ，１１2 の出力電圧を増幅回路６
1 ，６2 で増幅した後、両者の出力電圧を差動増幅回路
１２で差動増幅し、この差動増幅回路１２の出力電圧を
比較回路７において基準電圧Ｖｒと比較しており、温度
補正回路Ａ3 の構成については実施例２における温度補
正回路Ａ2 の構成と同一である。In this embodiment, as shown in FIG.
The amplifier circuit 6 outputs the output voltage of the photodiodes 11 1 and 11 2.
After being amplified by 1 and 6 2 , the output voltage of both is differentially amplified by the differential amplifier circuit 12, and the output voltage of this differential amplifier circuit 12 is compared with the reference voltage Vr in the comparison circuit 7, and the temperature correction is performed. The configuration of the circuit A 3 is the same as that of the temperature correction circuit A 2 in the second embodiment.

【００３１】上述のように、２つのホトダイオード１１
1 ，１１2 を有する場合（例えば、測距センサのような
場合）、両ホトダイオード１１1 ，１１2 の出力電圧を
差動増幅した後の比較回路７における基準電圧Ｖｒに温
度補正をかけるため、各ホトダイオード１１1 ，１１2
ごとに温度補正を切り換えてかける必要がなく、切換部
３は１つで済み回路構成を簡略化することができる。ま
た、ホトダイオード１１1 ，１１2 の出力電圧をある程
度増幅した後で信号処理することにより、耐ノイズ性を
向上できるという利点もある。As mentioned above, the two photodiodes 11
In the case of having 1 and 11 2 (for example, in the case of a distance measuring sensor), in order to perform temperature correction on the reference voltage Vr in the comparison circuit 7 after differentially amplifying the output voltage of both photodiodes 11 1 and 11 2 , Each photodiode 11 1 , 11 2
It is not necessary to switch the temperature correction for each time, and only one switching unit 3 is required, and the circuit configuration can be simplified. There is also an advantage that noise resistance can be improved by performing signal processing after amplifying the output voltages of the photodiodes 11 1 and 11 2 to some extent.

【００３２】（実施例４）図４は本発明の第４の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ4 は、実施例１及び実施例２と同じくある特定の温度
（変移点）より高温側と低温側とで温度特性が異なる図
１２に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例における温度補正回路Ａ4
の基本構成は実施例１及び実施例２のものと共通であ
り、共通する部分については同一の符号を付して説明は
省略する。(Embodiment 4) FIG. 4 is a circuit block diagram showing a fourth embodiment of the present invention. The temperature correction circuit A 4 of the present embodiment has the same sensor temperature as that shown in FIG. 12 in which the temperature characteristics are different on the high temperature side and the low temperature side from the same specific temperature (transition point) as in the first and second embodiments. It is for correcting the characteristics. The temperature correction circuit A 4 in this embodiment is
The basic configuration of is common to that of the first and second embodiments, and the common portions are denoted by the same reference numerals and the description thereof will be omitted.

【００３３】本実施例の温度補正回路Ａ4 は、増幅回路
６を構成するオペアンプＯＰ1 の入力側に温度補正部１
を設けてある。つまり、オペアンプＯＰ1 の反転側入力
端と出力端との間に接続される帰還抵抗Ｒｆと直列に、
アナログスイッチＡＳ1 ，ＡＳ2 と感温抵抗Ｒｔ1 ，Ｒ
ｔ2 との直列回路を接続し、コンパレータ９の出力で２
つのアナログスイッチＡＳ1 ，ＡＳ2 を選択的にオンし
て増幅回路６の増幅度の温度特性を切り換えるようにし
てある。In the temperature correction circuit A 4 of this embodiment, the temperature correction unit 1 is provided on the input side of the operational amplifier OP 1 which constitutes the amplifier circuit 6.
Is provided. That is, in series with the feedback resistor Rf connected between the inverting side input terminal and the output terminal of the operational amplifier OP 1 ,
Analog switches AS 1 and AS 2 and temperature-sensitive resistors Rt 1 and R
Connect a series circuit with t 2 and output 2
The two analog switches AS 1 and AS 2 are selectively turned on to switch the temperature characteristic of the amplification degree of the amplifier circuit 6.

【００３４】すなわち、温度検出素子２の抵抗値が温度
によって変化すると、コンパレータ９からはハイ，ロー
の２値の電圧が出力され、コンパレータ９の出力電圧が
ハイの場合にはアナログスイッチＡＳ1 がオン、アナロ
グスイッチＡＳ2 がオフとなり、出力電圧がローの場合
にはアナログスイッチＡＳ1 がオフ、アナログスイッチ
ＡＳ2 がオンとなる。アナログスイッチＡＳ1 がオン、
アナログスイッチＡＳ 2 がオフの場合には、オペアンプ
ＯＰ1 の帰還抵抗Ｒｆと感温抵抗Ｒｔ1 とが直列接続さ
れて、これら帰還抵抗Ｒｆ及び感温抵抗Ｒｔ1 により増
幅回路６の増幅度が決まり、しかも、その増幅度は感温
抵抗Ｒｔ1 の抵抗温度変化率に応じた温度特性を有す
る。また、アナログスイッチＡＳ1 がオフ、アナログス
イッチＡＳ 2 がオンの場合には、帰還抵抗Ｒｆと感温抵
抗Ｒｔ2 とが直列接続されて、これら帰還抵抗Ｒｆ及び
感温抵抗Ｒｔ1 により増幅回路６の増幅度が決まり、し
かも、その増幅度は感温抵抗Ｒｔ2 の抵抗温度変化率に
応じた温度特性を有する。That is, the resistance value of the temperature detecting element 2 is the temperature.
Is changed to high or low from the comparator 9.
The binary voltage of is output and the output voltage of the comparator 9 is
Analog switch AS when high1Turned on, analog
Switch AS2Is off and the output voltage is low
Has an analog switch AS1Off, analog switch
AS2Turns on. Analog switch AS1Is on,
Analog switch AS 2Is off, op amp
OP1Feedback resistance Rf and temperature sensitive resistance Rt1And are connected in series
The feedback resistance Rf and the temperature sensitive resistance Rt1Increased by
The amplification degree of the width circuit 6 is determined, and the amplification degree is temperature sensitive.
Resistance Rt1Has temperature characteristics according to the rate of change in resistance temperature of
It Also, the analog switch AS1Off, analog
Itch AS 2When is on, the feedback resistance Rf and temperature
Anti-Rt2And are connected in series, these feedback resistors Rf and
Temperature-sensitive resistance Rt1The amplification degree of the amplifier circuit 6 is determined by
Maybe, the degree of amplification is the temperature sensitive resistance Rt.2To the resistance temperature change rate of
It has corresponding temperature characteristics.

【００３５】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、これらの増幅度は感温抵抗Ｒｔ1 ，Ｒ
ｔ2の抵抗温度変化率に応じた温度特性を持つから、低
温側領域と高温側領域で温度特性が異なるセンサに対し
て温度特性がほぼ一定となるような最適な補正をかける
ことができる。しかも、増幅回路６が飽和してしまうよ
うな場合でも、温度補正部１により増幅度を下げるよう
に温度補正をかければ、ホトダイオード１１の出力に対
するダイナミックレンジの拡大と温度補正とが同時に実
現できる。なお、感温抵抗Ｒｔ1 ，Ｒｔ2 は、センサの
検出距離の温度特性が正負いずれの場合もあるから、セ
ンサが使用される場所の環境に応じて最適な補正がかけ
れるように正温度係数，負温度係数のものを適宜選択し
て使用すればよい。According to the above-mentioned configuration, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and these amplification degrees are the temperature sensitive resistors Rt 1 and Rt.
Since having a temperature characteristic corresponding to the resistance temperature coefficient of t 2, it is possible to apply a substantially constant become such optimum correction temperature characteristics for the temperature characteristics are different sensor on the low temperature side region and the high temperature side region . Moreover, even when the amplifier circuit 6 is saturated, if the temperature correction unit 1 performs temperature correction so as to reduce the amplification degree, the dynamic range expansion and the temperature correction for the output of the photodiode 11 can be realized at the same time. The temperature-sensitive resistors Rt 1 and Rt 2 are
Since the temperature characteristics of the detection distance may be positive or negative, it is necessary to select and use one with a positive temperature coefficient or a negative temperature coefficient as appropriate so that the optimum correction can be applied according to the environment of the place where the sensor is used. Good.

【００３６】（実施例５）図５は本発明の第５の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ5 は、ある特定の温度（変移点）より低温側では温度
による検出出力の変動がなく高温側でのみ温度により検
出出力が変動する温度特性を有する図１４に示したよう
なセンサの温度特性を補正するためのものである。な
お、本実施例の基本構成は実施例１のものと共通であ
り、共通する部分の説明は省略して本実施例の特徴とな
る部分についてのみ説明する。(Embodiment 5) FIG. 5 is a circuit block diagram showing a fifth embodiment of the present invention. The temperature correction circuit A 5 of the present embodiment is shown in FIG. 14 having a temperature characteristic in which the detection output does not fluctuate due to temperature on the lower temperature side than a certain specific temperature (transition point) and the detection output fluctuates only on the high temperature side. It is for correcting the temperature characteristic of such a sensor. The basic configuration of the present embodiment is common to that of the first embodiment, and the description of the common parts will be omitted and only the characteristic parts of the present embodiment will be described.

【００３７】本実施例の温度補正回路Ａ5 は、実施例１
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例１の温度補正回路Ａ1 と共通で
ある。The temperature correction circuit A 5 of this embodiment is the same as that of the first embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 1 of the first embodiment.

【００３８】本実施例の温度補正回路Ａ5 は、温度検出
素子２の検出温度が上記変移点より低温であった場合に
は、切換部３が切換信号により温度補正部１のトランジ
スタＱ1 をオンとし、トランジスタＱ2 をオフとするこ
とにより、固定抵抗Ｒ1 ，Ｒ 2 が信号処理回路４に直列
接続される。この場合には信号処理回路４の元々の温度
特性は抵抗Ｒ2 が接続されることによっては殆ど影響を
受けることがない。Temperature correction circuit A of this embodimentFiveTemperature detection
When the detected temperature of element 2 is lower than the above transition point
Is the transition of the temperature correction unit 1 by the switching unit 3 by the switching signal.
Star Q1To turn on the transistor Q2To turn off
Fixed resistance R1, R 2In series with the signal processing circuit 4
Connected. In this case, the original temperature of the signal processing circuit 4
Characteristic is resistance R2Is almost affected by the connection of
Never receive.

【００３９】一方、温度検出素子２の検出温度が変移点
より高温であった場合には、切換部３は切換信号により
温度補正部１のトランジスタＱ1 をオフとしトランジス
タＱ 2 をオンとすることにより、固定抵抗Ｒ1 と感温抵
抗Ｒｔ2 の直列接続による合成抵抗で決まる補正係数の
温度補正を信号処理回路４にかけることができる。すな
わち、本実施例では、切換部３によって温度補正制御手
段を構成し、温度検出素子２の検出温度が変移点より高
温であった場合にのみ、温度補正部１による温度補正を
かけるようにしているのである。On the other hand, the detected temperature of the temperature detecting element 2 is a transition point.
When the temperature is higher, the switching unit 3 sends a switching signal.
Transistor Q of temperature correction unit 11Turn off and transis
Q 2By turning on the fixed resistor R1And temperature sensitivity
Anti-Rt2Of the correction coefficient determined by the combined resistance of the series connection of
The temperature correction can be applied to the signal processing circuit 4. sand
That is, in this embodiment, the temperature correction control operation is performed by the switching unit 3.
The temperature detected by the temperature detection element 2 is higher than the transition point.
Only when the temperature is high, the temperature correction unit 1 should correct the temperature.
I am trying to call it.

【００４０】上述の構成では、温度検出素子２による検
出温度に応じて上記変移点より低温側では信号処理回路
４に固定抵抗Ｒ2 を接続し、変移点より高温側では信号
処理回路４に感温抵抗Ｒｔ2 を接続するように切換部３
により切り換えるので、低温側領域では温度補正をかけ
ず、高温側では高温側領域の温度補正に適した補正係数
をかけることができ、低温側領域が略平坦な温度特性で
且つ高温側領域で平坦でない温度特性を有するセンサに
対して温度特性がほぼ一定なるような最適な補正をかけ
ることができる。なお、感温抵抗Ｒｔ2 は、センサの検
出距離の温度特性が正負いずれの場合もあるから、セン
サが使用される場所の環境に応じて最適な補正がかけれ
るように正温度係数，負温度係数のものを適宜選択して
使用すればよい。In the above configuration, the fixed resistor R 2 is connected to the signal processing circuit 4 on the temperature lower side than the transition point according to the temperature detected by the temperature detecting element 2, and the signal processing circuit 4 senses on the temperature side higher than the transition point. Switching unit 3 to connect temperature resistance Rt 2
Since it is switched by, the correction coefficient suitable for the temperature correction of the high temperature side can be applied on the high temperature side without performing the temperature correction on the low temperature side, and the low temperature side area has a substantially flat temperature characteristic and the high temperature side area is flat. temperature characteristics for <br/> the sensor having the temperature characteristics not can apply a substantially constant becomes such optimum correction. Incidentally, the temperature sensitive resistor Rt 2 is tested sensor
Since the temperature characteristic of the exit distance may be positive or negative, it is necessary to select and use one with a positive temperature coefficient or a negative temperature coefficient as appropriate so that the optimum correction can be applied according to the environment of the place where the sensor is used. Good.

【００４１】（実施例６）図６は本発明の第６の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ6 は、実施例５と同じくある特定の温度（変移点）よ
り低温側では温度による検出出力の変動がなく高温側で
のみ温度により検出出力が変動する温度特性を有する図
１４に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例２のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 6) FIG. 6 is a circuit block diagram showing a sixth embodiment of the present invention. The temperature correction circuit A 6 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate due to temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates on the high temperature side only, as in the fifth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of this embodiment is the same as that of the second embodiment, and the description of the common portions will be omitted and only the characteristic features of this embodiment will be described.

【００４２】本実施例の温度補正回路Ａ6 は、実施例２
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例２の温度補正回路Ａ2 と共通で
ある。The temperature correction circuit A 6 of this embodiment is the same as that of the second embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 2 of the second embodiment.

【００４３】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、低温側領域における
基準電圧Ｖｒ1 は温度により殆ど変動せず、且つ基準電
圧Ｖｒ2 は感温抵抗Ｒｔ2 の抵抗温度変化率に応じた温
度特性を持つから、低温側領域では温度補正をかけず、
高温側では高温側領域の温度補正に適した補正係数をか
けることができ、低温側領域が略平坦な温度特性で且つ
高温側領域で平坦でない温度特性を有するセンサに対し
て温度特性がほぼ一定となるような最適な補正をかける
ことができる。また、実施例３のように複数の検出素子
（ホトダイオード１１1 ，１１2 ）の出力を差動増幅し
て検出距離を得るような場合でも検出素子毎に温度補正
部１及び切換部３を設ける必要がなく、複数の検出素子
にも容易に対応することができる。なお、感温抵抗Ｒｔ
2 は、センサの検出距離の温度特性が正負いずれの場合
もあるから、センサが使用される場所の環境に応じて最
適な補正がかけれるように正温度係数，負温度係数のも
のを適宜選択して使用すればよい。According to the above-mentioned structure, the reference voltage Vr 1 of the comparison circuit 7 in the region on the low temperature side and the region on the high temperature side from the transition point,
Since Vr 2 is switched, the reference voltage Vr 1 in the low temperature region hardly changes with temperature, and the reference voltage Vr 2 has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 2 . Do not apply temperature correction in the low temperature range,
In the high temperature side can make a correction coefficient which is suitable for temperature correction of the high-temperature side region, the temperature characteristics for the sensor having the temperature characteristic is not flat and at a high temperature side region substantially flat temperature characteristic low temperature side region substantially It is possible to apply the optimum correction so that it becomes constant. In addition, as in the third embodiment, a plurality of detection elements
(Photodiode 11 1, 11 2) there is no need to provide a temperature correction unit 1 and switching unit 3 outputs for each detector element even when the obtain detected distance by differential amplification of a plurality of detection elements <br/> Can be easily dealt with. The temperature-sensitive resistance Rt
For 2 , the temperature characteristic of the detection distance of the sensor may be positive or negative, so positive temperature coefficient or negative temperature coefficient is selected as appropriate so that optimal correction can be applied according to the environment of the place where the sensor is used. And use it.

【００４４】（実施例７）図７は本発明の第７の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ7 は、実施例５と同じくある特定の温度（変移点）よ
り低温側では温度による検出出力の変動がなく高温側で
のみ温度により検出出力が変動する温度特性を有する図
１４に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例４のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 7) FIG. 7 is a circuit block diagram showing a seventh embodiment of the present invention. The temperature correction circuit A 7 according to the present embodiment has the same temperature characteristic that the detection output does not fluctuate with temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates with the temperature only on the high temperature side as in the fifth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of the present embodiment is common to that of the fourth embodiment, and the description of the common portions will be omitted and only the characteristic features of the present embodiment will be described.

【００４５】本実施例の温度補正回路Ａ7 は、実施例４
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ1 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より高
温側においてのみ感温抵抗Ｒｔ2 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例４の温度補正回路Ａ4 と共通で
ある。The temperature correction circuit A 7 of this embodiment is the same as that of the fourth embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt one temperature sensitive resistor Rt 1 resistance temperature variation rate of the of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the high temperature side of the transition point It is characterized in that the temperature is corrected by the resistance temperature change rate of the resistor Rt 2 , and other configurations are common to the temperature correction circuit A 4 of the fourth embodiment.

【００４６】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、低温側領域における増幅度は温度によ
り殆ど変動せず、且つ高温側領域における増幅度は感温
抵抗Ｒｔ2 の抵抗温度変化率に応じた温度特性を持つか
ら、低温側領域では温度補正をかけず、高温側では高温
側領域の温度補正に適した補正をかけることができ、低
温側領域が略平坦な温度特性で且つ高温側領域で平坦で
ない温度特性を有するセンサに対して温度特性がぼほ一
定なるような最適な補正をかけることができる。しか
も、増幅回路６が飽和してしまうような場合でも、温度
補正部１により増幅度を下げるように温度補正をかけれ
ば、ホトダイオード１１の出力に対するダイナミックレ
ンジの拡大と温度補正とが同時に実現できる。なお、感
温抵抗Ｒｔ2 は、センサの検出距離の温度特性が正負い
ずれの場合もあるから、センサが使用される場所の環境
に応じて最適な補正がかけれるように正温度係数，負温
度係数のものを適宜選択して使用すればよい。According to the above configuration, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and the amplification degree in the low temperature side area hardly changes depending on the temperature. Moreover, since the amplification degree in the high temperature side region has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 2 , temperature correction is not performed in the low temperature side region, and it is suitable for temperature correction in the high temperature side region in the high temperature side. correction can be applied can be subjected to the low temperature side region substantially flat temperature characteristics in and the high temperature side region at the optimum so that the temperature characteristics crucible Ho becomes constant for the sensor having the temperature characteristic is not flat correction . Moreover, even when the amplifier circuit 6 is saturated, if the temperature correction unit 1 performs temperature correction so as to reduce the amplification degree, the dynamic range expansion and the temperature correction for the output of the photodiode 11 can be realized at the same time. The temperature resistance Rt 2 has a positive temperature coefficient and a negative temperature coefficient so that the temperature characteristic of the detection distance of the sensor may be positive or negative depending on the environment of the place where the sensor is used. A coefficient may be appropriately selected and used.

【００４７】（実施例８）図８は本発明の第８の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ8 は、ある特定の温度（変移点）より高温側では温度
による検出出力の変動がなく低温側でのみ温度により検
出出力が変動する温度特性を有する図１５に示したよう
なセンサの温度特性を補正するためのものである。な
お、本実施例の基本構成は実施例１のものと共通であ
り、共通する部分の説明は省略して本実施例の特徴とな
る部分についてのみ説明する。(Embodiment 8) FIG. 8 is a circuit block diagram showing an eighth embodiment of the present invention. The temperature correction circuit A 8 of the present embodiment is shown in FIG. 15 having a temperature characteristic in which the detection output does not fluctuate on the high temperature side above a certain specific temperature (transition point) and the detection output fluctuates on the low temperature side only. It is for correcting the temperature characteristic of such a sensor. The basic configuration of the present embodiment is common to that of the first embodiment, and the description of the common parts will be omitted and only the characteristic parts of the present embodiment will be described.

【００４８】本実施例の温度補正回路Ａ8 は、実施例１
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ2 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より低
温側においてのみ感温抵抗Ｒｔ1 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例１の温度補正回路Ａ1 と共通で
ある。The temperature correction circuit A 8 of this embodiment is the same as that of the first embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt while the temperature sensitive resistor Rt 2 resistance temperature rate of change of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the low temperature side than the transition point It is characterized in that temperature correction is performed by the resistance temperature change rate of the resistor Rt 1 , and other configurations are common to the temperature correction circuit A 1 of the first embodiment.

【００４９】本実施例の温度補正回路Ａ8 は、温度検出
素子２の検出温度が上記変移点より高温であった場合に
は、切換部３が切換信号により温度補正部１のトランジ
スタＱ1 をオフとし、トランジスタＱ2 をオンとするこ
とにより、固定抵抗Ｒ1 ，Ｒ 2 が信号処理回路４に直列
接続される。この場合には信号処理回路４の元々の温度
特性は抵抗Ｒ2 が接続されることによっては殆ど影響を
受けることがない。Temperature correction circuit A of this embodiment8Temperature detection
When the detected temperature of element 2 is higher than the above transition point
Is the transition of the temperature correction unit 1 by the switching unit 3 by the switching signal.
Star Q1To turn off the transistor Q2Turn on
Fixed resistance R1, R 2In series with the signal processing circuit 4
Connected. In this case, the original temperature of the signal processing circuit 4
Characteristic is resistance R2Is almost affected by the connection of
Never receive.

【００５０】一方、温度検出素子２の検出温度が変移点
より低温であった場合には、切換部３は切換信号により
温度補正部１のトランジスタＱ1 をオンとしトランジス
タＱ 2 をオフとすることにより、固定抵抗Ｒ1 と感温抵
抗Ｒｔ1 の直列接続による合成抵抗で決まる補正係数の
温度補正を信号処理回路４にかけることができる。上述
の構成では、温度検出素子２による検出温度に応じて上
記変移点より高温側では信号処理回路４に固定抵抗Ｒ2
を接続し、変移点より低温側では信号処理回路４に感温
抵抗Ｒｔ1 を接続するように切換部３により切り換える
ので、高温側領域では温度補正をかけず、低温側でのみ
低温側領域の温度補正に適した補正係数の補正をかける
ことができ、高温側領域が略平坦な温度特性で且つ低温
側領域で平坦でない温度特性を有するセンサに対して温
度特性がほぼ一定となるような最適な補正をかけること
ができる。なお、感温抵抗Ｒｔ1 は、センサの検出距離
の温度特性が正負いずれの場合もあるから、センサが使
用される場所の環境に応じて最適な補正がかけれるよう
に正温度係数，負温度係数のものを適宜選択して使用す
ればよい。On the other hand, the detected temperature of the temperature detecting element 2 is a transition point.
When the temperature is lower, the switching unit 3 sends a switching signal.
Transistor Q of temperature correction unit 11Turn on and Transis
Q 2By turning off the1And temperature sensitivity
Anti-Rt1Of the correction coefficient determined by the combined resistance of the series connection of
The temperature correction can be applied to the signal processing circuit 4. Above
In the above configuration, depending on the temperature detected by the temperature detecting element 2,
A fixed resistor R is provided in the signal processing circuit 4 on the temperature side higher than the transition point.2
Connected to the signal processing circuit 4 at the temperature lower than the transition point.
Resistance Rt1Is switched by the switching unit 3 so as to connect
Therefore, temperature correction is not applied in the high temperature area, only in the low temperature area.
Apply a correction coefficient suitable for temperature correction in the low temperature region
The temperature characteristics of the high temperature region are almost flat and the temperature is low.
A sensor having a temperature characteristic that is not flat in the side regionTo the serviceTo warm
Apply the optimum correction so that the degree characteristics are almost constant.
Can be. The temperature-sensitive resistance Rt1Of the sensorDetection distance
The temperature characteristics of may be positive or negative, so the sensor
Optimum correction can be applied according to the environment of the place where it is used
Select and use positive temperature coefficient and negative temperature coefficient appropriately.
Just do it.

【００５１】（実施例９）図９は本発明の第９の実施例
を示す回路ブロック図である。本実施例の温度補正回路
Ａ9 は、実施例８と同じくある特定の温度（変移点）よ
り高温側では温度による検出出力の変動がなく低温側で
のみ温度により検出出力が変動する温度特性を有する図
１５に示したようなセンサの温度特性を補正するための
ものである。なお、本実施例の基本構成は実施例２のも
のと共通であり、共通する部分の説明は省略して本実施
例の特徴となる部分についてのみ説明する。(Embodiment 9) FIG. 9 is a circuit block diagram showing a ninth embodiment of the present invention. The temperature correction circuit A 9 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate due to temperature on the higher temperature side than the specific temperature (transition point) and the detection output fluctuates on the low temperature side only as in the eighth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of this embodiment is the same as that of the second embodiment, and the description of the common portions will be omitted and only the characteristic features of this embodiment will be described.

【００５２】本実施例の温度補正回路Ａ9 は、実施例２
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ2 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より低
温側においてのみ感温抵抗Ｒｔ1 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例２の温度補正回路Ａ2 と共通で
ある。The temperature correction circuit A 9 of this embodiment is the same as that of the second embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt while the temperature sensitive resistor Rt 2 resistance temperature rate of change of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the low temperature side than the transition point It is characterized in that temperature correction is performed by the resistance temperature change rate of the resistance Rt 1 , and other configurations are common to the temperature correction circuit A 2 of the second embodiment.

【００５３】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで比較回路７の基準電圧Ｖｒ1 ，
Ｖｒ2 を切り換えており、しかも、高温側領域における
基準電圧Ｖｒ2 は温度により殆ど変動せず、且つ低温側
領域における基準電圧Ｖｒ1は感温抵抗Ｒｔ1 の抵抗温
度変化率に応じた温度特性を持つから、高温側領域では
温度補正をかけず、低温側では低温側領域の温度補正に
適した補正係数による温度補正をかけることができ、高
温側領域が略平坦な温度特性で且つ低温側領域で平坦で
ない温度特性を有するセンサに対して温度特性がほぼ一
定となるような最適な補正をかけることができる。ま
た、実施例３のように複数の検出素子の出力を差動増幅
して検出距離を得るような場合でも検出素子毎に温度補
正部１及び切換部３を設ける必要がなく、複数の検出素
子にも容易に対応することができる。なお、感温抵抗Ｒ
ｔ1 は、センサの検出距離の温度特性が正負いずれの場
合もあるから、センサが使用される場所の環境に応じて
最適な補正がかけれるように正温度係数，負温度係数の
ものを適宜選択して使用すればよい。According to the above-mentioned structure, the reference voltage Vr 1 of the comparison circuit 7 in the region on the low temperature side and the region on the high temperature side from the transition point,
Vr 2 is switched, the reference voltage Vr 2 in the high temperature region hardly changes with temperature, and the reference voltage Vr 1 in the low temperature region has a temperature characteristic corresponding to the resistance temperature change rate of the temperature sensitive resistor Rt 1. Therefore, it is possible to perform temperature correction using a correction coefficient suitable for temperature correction in the low temperature side region on the low temperature side without performing temperature correction on the high temperature side region, and the high temperature side region has a substantially flat temperature characteristic and the low temperature side region. temperature characteristic for the sensor having the temperature characteristic is not flat in the region can apply a substantially constant become such optimum correction. Further, even when the outputs of a plurality of detection elements are differentially amplified to obtain a detection distance as in the third embodiment , it is not necessary to provide the temperature correction unit 1 and the switching unit 3 for each detection element , and a plurality of detection elements are provided.
Can easily accommodate children . In addition, the temperature sensitive resistance R
Since the temperature characteristic of the detection distance of the sensor may be either positive or negative, t 1 has a positive temperature coefficient and a negative temperature coefficient as appropriate so that optimum correction can be applied according to the environment of the place where the sensor is used. You can select and use it.

【００５４】（実施例１０）図１０は本発明の第１０の
実施例を示す回路ブロック図である。本実施例の温度補
正回路Ａ10は、実施例８と同じくある特定の温度（変移
点）より低温側では温度による検出出力の変動がなく高
温側でのみ温度により検出出力が変動する温度特性を有
する図１５に示したようなセンサの温度特性を補正する
ためのものである。なお、本実施例の基本構成は実施例
４のものと共通であり、共通する部分の説明は省略して
本実施例の特徴となる部分についてのみ説明する。(Embodiment 10) FIG. 10 is a circuit block diagram showing a tenth embodiment of the present invention. The temperature correction circuit A 10 of the present embodiment has the same temperature characteristic that the detection output does not fluctuate with temperature on the lower temperature side than the specific temperature (transition point) and the detection output fluctuates with the temperature only on the high temperature side as in the eighth embodiment. This is for correcting the temperature characteristic of the sensor as shown in FIG. The basic configuration of the present embodiment is common to that of the fourth embodiment, and the description of the common portions will be omitted and only the characteristic features of the present embodiment will be described.

【００５５】本実施例の温度補正回路Ａ10は、実施例４
の構成において、２つの感温抵抗Ｒｔ1 ，Ｒｔ2 のうち
の一方の感温抵抗Ｒｔ2 を抵抗温度変化率が極めて小さ
い固定抵抗Ｒ2 に置き換えることにより、変移点より低
温側においてのみ感温抵抗Ｒｔ1 の抵抗温度変化率によ
る温度補正をかけている点に特徴があり、それ以外の他
の構成については実施例４の温度補正回路Ａ4 と共通で
ある。The temperature correction circuit A 10 of this embodiment is the same as that of the fourth embodiment.
In the configuration of, by two temperature sensitive resistors Rt 1, Rt while the temperature sensitive resistor Rt 2 resistance temperature rate of change of the two is replaced with a very small fixed resistor R 2, only the temperature-sensitive in the low temperature side than the transition point It is characterized in that temperature correction is performed by the resistance temperature change rate of the resistor Rt 1 , and other configurations are common to the temperature correction circuit A 4 of the fourth embodiment.

【００５６】上述の構成によれば、変移点より低温側の
領域と高温側の領域とで増幅回路６の増幅度を切り換え
ており、しかも、高温側領域における増幅度は温度によ
り殆ど変動せず、且つ低温側領域における増幅度は感温
抵抗Ｒｔ1 の抵抗温度変化率に応じた温度特性を持つか
ら、高温側領域では温度補正をかけず、低温側では低温
側領域の温度補正に適した補正係数をかけることがで
き、高温側領域が略平坦な温度特性で且つ低温側領域で
平坦でない温度特性を有するセンサに対して温度特性が
ほぼ一定となるような最適な補正をかけることができ
る。しかも、増幅回路６が飽和してしまうような場合で
も、温度補正部１により増幅度を下げるように温度補正
をかければ、ホトダイオード１１の出力に対するダイナ
ミックレンジの拡大と温度補正とが同時に実現できる。
なお、感温抵抗Ｒｔ1 は、センサの検出距離の温度特性
が正負いずれの場合もあるから、センサが使用される場
所の環境に応じて最適な補正がかけれるように正温度係
数，負温度係数のものを適宜選択して使用すればよい。According to the above structure, the amplification degree of the amplifier circuit 6 is switched between the low temperature side area and the high temperature side area from the transition point, and the amplification degree in the high temperature side area hardly changes depending on the temperature. Moreover, since the amplification degree in the low temperature side region has a temperature characteristic according to the resistance temperature change rate of the temperature sensitive resistor Rt 1 , temperature correction is not performed in the high temperature side region, and it is suitable for temperature correction in the low temperature side region in the low temperature side. You can apply the correction factor and applying a substantially constant become such optimum correction temperature characteristics for the sensor with a temperature characteristic the high temperature side region not substantially flat and at a low temperature side region with a flat temperature characteristic it can. Moreover, even when the amplifier circuit 6 is saturated, if the temperature correction unit 1 performs temperature correction so as to reduce the amplification degree, the dynamic range expansion and the temperature correction for the output of the photodiode 11 can be realized at the same time.
In addition, since the temperature characteristic of the detection distance of the sensor may be positive or negative, the temperature-sensitive resistance Rt 1 has a positive temperature coefficient and a negative temperature coefficient so as to be optimally corrected according to the environment of the place where the sensor is used. A coefficient may be appropriately selected and used.

【００５７】[0057]

【発明の効果】請求項１の発明は、検出素子の出力に基
づいて物体の存否や距離などを検出し、温度により検出
距離が変動する温度特性を有するとともにある特定の温
度より高温側と低温側とで温度特性が異なるセンサの温
度特性を補正する温度補正回路であって、高温側の温度
特性を補正するための高温側補正係数及び低温側の温度
特性を補正するための低温側補正係数が切り換えられて
センサの温度特性を補正する温度補正部と、温度を検出
する温度検出素子と、温度検出素子の検出温度に基づい
て温度補正部における補正係数を切り換える切換部とを
備えたので、温度検出素子により検出した温度が上記特
定の温度より高温の場合には、切換部により温度補正部
における補正係数が高温側の補正係数に切り換えられ、
反対に上記特定の温度より低温の場合には、切換部によ
り温度補正部における補正係数が低温側の補正係数に切
り換えられるため、ある特定の温度より高温側と低温側
とで温度特性が異なるセンサの温度特性がほぼ一定とな
るような適切な補正をかけることができ、センサの使い
勝手を向上させることができるという効果がある。The invention of claim 1 is based on the output of the detection element.
Based on this, the existence of an object and the distance are detected, and the temperature is detected.
A temperature correction circuit that corrects the temperature characteristics of a sensor that has temperature characteristics in which the distance fluctuates and that has different temperature characteristics on the higher temperature side and the lower temperature side than a certain temperature. Side correction coefficient and the low temperature side correction coefficient for correcting the temperature characteristic on the low temperature side are switched to correct the temperature characteristic of the sensor, the temperature detecting element for detecting the temperature, and the temperature detected by the temperature detecting element. Since the temperature correction unit includes a switching unit that switches the correction coefficient based on the temperature detection unit, when the temperature detected by the temperature detection element is higher than the specific temperature, the switching unit causes the correction coefficient in the temperature correction unit to be higher than the specific temperature. Switching to the correction coefficient,
On the contrary, when the temperature is lower than the specified temperature, the correction coefficient in the temperature correction unit is switched to the correction coefficient on the low temperature side by the switching unit, so that the sensor having different temperature characteristics on the higher temperature side and the lower temperature side than the certain temperature. temperature characteristics of can apply a substantially constant and so as a proper correction, there is an effect that it is possible to improve the usability of the sensor.

【００５８】請求項２の発明は、センサは検出素子の出
力を信号処理して検出距離を得る信号処理部を備え、温
度補正部が信号処理部の温度特性を補正するため、補正
を容易に行うことができるという効果がある。請求項３
の発明は、センサは検出素子の出力を所定の基準値と比
較する比較部を備え、温度補正部が比較部の基準値の温
度特性を補正するため、複数の検出素子の出力を差動増
幅して検出距離を得るような場合でも検出素子毎に温度
補正部及び切換部を設ける必要がなく、複数の検出素子
を備えるセンサにも容易に対応することができるという
効果がある。According to a second aspect of the invention, the sensor is a detector element.
Equipped with a signal processing unit that processes the force signal to obtain the detection distance,
Since the degree correction unit corrects the temperature characteristic of the signal processing unit, there is an effect that the correction can be easily performed. Claim 3
In the invention, the sensor compares the output of the detection element with a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit , the temperature correction is performed for each detection element even when the detection distance is obtained by differentially amplifying the outputs of multiple detection elements. It is not necessary to provide a detector and a switching unit, and a plurality of detection elements
There is an effect that it is possible to easily deal with a sensor provided with .

【００５９】請求項４の発明は、センサは検出素子の出
力を増幅する増幅部を備え、温度補正部が増幅部の温度
特性を補正するため、増幅部が飽和してしまうような場
合でも増幅度を下げるように温度補正をかければダイナ
ミックレンジの拡大と温度補正とが同時に実現できると
いう効果がある。請求項５の発明は、検出素子の出力に
基づいて物体の存否や距離などを検出し、ある特定の温
度より低温側では温度による検出距離の変動がなく高温
側でのみ温度により検出距離が変動する温度特性を有す
るセンサの温度特性を補正する温度補正回路であって、
高温側の温度特性を補正する温度補正部と、温度を検出
する温度検出素子と、温度検出素子の検出出力が上記特
定の温度より高いときにのみ温度補正部を動作させる温
度補正制御手段とを備えたので、温度検出素子により検
出した温度が上記特定の温度より低温の場合には温度補
正部による温度補正が行われず、反対に上記特定の温度
より高温の場合には、温度補正制御手段が温度補正部を
制御してセンサに対する温度補正を行うため、ある特定
の温度より低温側では温度による検出距離の変動がなく
高温側でのみ温度により検出距離が変動する温度特性を
有するセンサの温度特性がほぼ一定となるような適切な
補正をかけることができ、センサの使い勝手を向上させ
ることができるという効果がある。According to a fourth aspect of the invention, the sensor outputs the detection element.
Equipped with an amplifier that amplifies the force, the temperature corrector corrects the temperature characteristics of the amplifier, so even if the amplifier becomes saturated, temperature correction can be performed to reduce the amplification degree, which will expand the dynamic range. There is an effect that temperature correction can be realized at the same time. According to the invention of claim 5, in the output of the detection element
The presence or absence of an object or the distance is detected based on it, and the temperature characteristic of the sensor has the temperature characteristic that the detection distance does not fluctuate with temperature on the low temperature side and the detection distance fluctuates only on the high temperature side. A temperature correction circuit,
A temperature correction unit that corrects the temperature characteristics on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. Therefore, when the temperature detected by the temperature detecting element is lower than the specific temperature, the temperature correction unit does not perform temperature correction, and when the temperature is higher than the specific temperature, the temperature correction control means for temperature compensation against the sensor by controlling the temperature compensation unit, the sensor having a temperature characteristic that the detection distance varies with temperature only in a certain variation without the high temperature side of the detection distance with temperature on the low temperature side than the specified temperature can temperature characteristic exerts a substantially constant become such appropriate correction, there is an effect that it is possible to improve the usability of the sensor.

【００６０】請求項６の発明は、センサは検出素子の出
力を信号処理して検出距離を得る信号処理部を備え、温
度補正部が信号処理部の温度特性を補正するので、補正
を容易に行うことができるという効果がある。請求項７
の発明は、センサは検出素子の出力を所定の基準値と比
較する比較部を備え、温度補正部が比較部の基準値の温
度特性を補正するので、複数の検出素子の出力を差動増
幅して検出距離を得るような場合でも検出素子毎に温度
補正部及び切換部を設ける必要がなく、複数の検出素子
を備えるセンサにも容易に対応することができるという
効果がある。According to a sixth aspect of the invention, the sensor outputs the detection element.
Equipped with a signal processing unit that processes the force signal to obtain the detection distance,
Since the degree correction unit corrects the temperature characteristic of the signal processing unit, there is an effect that the correction can be easily performed. Claim 7
In the invention, the sensor compares the output of the detection element with a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristics of the reference value of the comparison unit , the temperature correction is performed for each detection element even when the outputs of multiple detection elements are differentially amplified to obtain the detection distance. It is not necessary to provide a detector and a switching unit, and a plurality of detection elements
There is an effect that it is possible to easily deal with a sensor provided with .

【００６１】請求項８の発明は、センサは検出素子の出
力を増幅する増幅部を備え、温度補正部が増幅部の温度
特性を補正するため、増幅部が飽和してしまうような場
合でも増幅度を下げるように温度補正をかければダイナ
ミックレンジの拡大と温度補正とが同時に実現できると
いう効果がある。請求項９の発明は、検出素子の出力に
基づいて物体の存否や距離などを検出し、ある特定の温
度より高温側では温度による検出距離の変動がなく低温
側でのみ温度により検出距離が変動する温度特性を有す
るセンサの温度特性を補正する温度補正回路であって、
低温側の温度特性を補正する温度補正部と、温度を検出
する温度検出素子と、温度検出素子の検出出力が上記特
定の温度より低いときにのみ温度補正部を動作させる温
度補正制御手段とを備えたので、温度検出素子により検
出した温度が上記特定の温度より高温の場合には温度補
正部による温度補正が行われず、反対に上記特定の温度
より低温の場合には、温度補正制御手段が温度補正部を
制御してセンサに対する温度補正を行うため、ある特定
の温度より高温側では温度による検出距離の変動がなく
低温側でのみ温度により検出距離が変動する温度特性を
有するセンサの温度特性がほぼ一定となるような適切な
補正をかけることができ、センサの使い勝手を向上させ
ることができるという効果がある。According to the eighth aspect of the invention, the sensor outputs the detection element.
Since the temperature correction unit corrects the temperature characteristics of the amplification unit, the temperature correction unit corrects the temperature characteristics of the amplification unit. There is an effect that temperature correction can be realized at the same time. According to the invention of claim 9, in the output of the detection element
The presence or absence of an object or the distance is detected based on it, and the temperature characteristic of a sensor having temperature characteristics in which the detection distance does not change due to temperature on the higher temperature side than a certain temperature and the detection distance changes only on the low temperature side is corrected. A temperature correction circuit,
A temperature correction unit that corrects the temperature characteristic on the low temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. Therefore, if the temperature detected by the temperature detecting element is higher than the specific temperature, the temperature correction unit does not perform temperature correction, and conversely, if the temperature is lower than the specific temperature, the temperature correction control means for temperature compensation against the sensor by controlling the temperature compensation unit, the sensor having a temperature characteristic that the detection distance varies with temperature only at a certain low temperature side without variation of the detection distance by the temperature in the high temperature side than the specified temperature can temperature characteristic exerts a substantially constant become such appropriate correction, there is an effect that it is possible to improve the usability of the sensor.

【００６２】請求項１０の発明は、センサは検出素子の
出力を信号処理して検出距離を得る信号処理部を備え、
温度補正部が信号処理部の温度特性を補正するので、補
正を容易に行うことができるという効果がある。請求項
１１の発明は、センサは検出素子の出力を所定の基準値
と比較する比較部を備え、温度補正部が比較部の基準値
の温度特性を補正するので、複数の検出素子の出力を差
動増幅して検出距離を得るような場合でも検出素子毎に
温度補正部及び切換部を設ける必要がなく、複数の検出
素子を備えるセンサにも容易に対応することができると
いう効果がある。According to the invention of claim 10, the sensor is a detection element.
A signal processing unit that processes the output to obtain the detection distance is provided.
Since the temperature correction unit corrects the temperature characteristic of the signal processing unit, there is an effect that the correction can be easily performed. In the invention of claim 11, the sensor outputs the output of the detection element to a predetermined reference value.
Since the temperature correction unit corrects the temperature characteristics of the reference value of the comparison unit, even if the outputs of multiple detection elements are differentially amplified to obtain the detection distance , the temperature for each detection element is compared. Multiple detection without the need for a correction unit and switching unit
There is an effect that it can be easily applied to a sensor including an element .

【００６３】請求項１２の発明は、センサは検出素子の
出力を増幅する増幅部を備え、温度補正部が増幅部の温
度特性を補正するため、増幅部が飽和してしまうような
場合でも増幅度を下げるように温度補正をかければダイ
ナミックレンジの拡大と温度補正とが同時に実現できる
という効果がある。According to the twelfth aspect of the invention, the sensor is a detection element.
Since the temperature correction unit corrects the temperature characteristic of the amplification unit by providing an amplification unit that amplifies the output, it is necessary to perform temperature correction so as to reduce the amplification degree even when the amplification unit is saturated. There is an effect that the expansion of the dynamic range and the temperature correction can be realized at the same time.

【図面の簡単な説明】[Brief description of drawings]

【図１】実施例１を示す回路ブロック図である。FIG. 1 is a circuit block diagram showing a first embodiment.

【図２】実施例２を示す回路ブロック図である。FIG. 2 is a circuit block diagram showing a second embodiment.

【図３】実施例３を示す回路ブロック図である。FIG. 3 is a circuit block diagram showing a third embodiment.

【図４】実施例４を示す回路ブロック図である。FIG. 4 is a circuit block diagram showing a fourth embodiment.

【図５】実施例５を示す回路ブロック図である。FIG. 5 is a circuit block diagram showing a fifth embodiment.

【図６】実施例６を示す回路ブロック図である。FIG. 6 is a circuit block diagram showing a sixth embodiment.

【図７】実施例７を示す回路ブロック図である。FIG. 7 is a circuit block diagram showing a seventh embodiment.

【図８】実施例８を示す回路ブロック図である。FIG. 8 is a circuit block diagram showing an eighth embodiment.

【図９】実施例９を示す回路ブロック図である。FIG. 9 is a circuit block diagram showing a ninth embodiment.

【図１０】実施例１０を示す回路ブロック図である。FIG. 10 is a circuit block diagram showing a tenth embodiment.

【図１１】センサの温度特性を説明するための説明図で
ある。FIG. 11 is an explanatory diagram for explaining temperature characteristics of a sensor.

【図１２】センサの他の温度特性を説明するための説明
図である。FIG. 12 is an explanatory diagram for explaining another temperature characteristic of the sensor.

【図１３】センサのさらに他の温度特性を説明するため
の説明図である。FIG. 13 is an explanatory diagram for explaining still another temperature characteristic of the sensor.

【図１４】センサの別の温度特性を説明するための説明
図である。FIG. 14 is an explanatory diagram for explaining another temperature characteristic of the sensor.

【図１５】センサのさらに別の温度特性を説明するため
の説明図である。FIG. 15 is an explanatory diagram for explaining still another temperature characteristic of the sensor.

【符号の説明】 Ａ1 温度補正回路 １ 温度補正部 ２ 温度検出素子 ３ 切換部 ４ 信号処理回路 ５ 出力回路[Explanation of Codes] A 1 temperature correction circuit 1 temperature correction unit 2 temperature detection element 3 switching unit 4 signal processing circuit 5 output circuit

Claims (12)

【特許請求の範囲】[Claims] 【請求項１】 温度により検出出力が変動する温度特性
を有するとともにある特定の温度より高温側と低温側と
で温度特性が異なるセンサの温度特性を補正する温度補
正回路であって、高温側の温度特性を補正するための高
温側補正係数及び低温側の温度特性を補正するための低
温側補正係数が切り換えられてセンサの温度特性を補正
する温度補正部と、温度を検出する温度検出素子と、温
度検出素子の検出温度に基づいて温度補正部における補
正係数を切り換える切換部とを備えたことを特徴とする
センサの温度補正回路。1. A temperature correction circuit for correcting temperature characteristics of a sensor having a temperature characteristic in which a detection output varies depending on temperature and having different temperature characteristics between a higher temperature side and a lower temperature side than a specific temperature, A temperature correction unit for correcting the temperature characteristic of the sensor by switching between a high temperature side correction coefficient for correcting the temperature characteristic and a low temperature side correction coefficient for correcting the low temperature side temperature characteristic; and a temperature detection element for detecting the temperature. A temperature correction circuit for a sensor, comprising: a switching unit that switches a correction coefficient in the temperature correction unit based on the temperature detected by the temperature detection element. 【請求項２】 温度補正部はセンサの出力を信号処理し
て検出出力を得る信号処理部の温度特性を補正すること
を特徴とする請求項１記載のセンサの温度補正回路。2. The temperature correction circuit for a sensor according to claim 1, wherein the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain a detection output. 【請求項３】 温度補正部はセンサの出力を所定の基準
値と比較して検出出力を得る比較部の基準値の温度特性
を補正することを特徴とする請求項１記載のセンサの温
度補正回路。3. The temperature correction of the sensor according to claim 1, wherein the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value. circuit. 【請求項４】 温度補正部はセンサの出力を増幅する増
幅部の温度特性を補正することを特徴とする請求項１記
載のセンサの温度補正回路。4. The temperature correction circuit for a sensor according to claim 1, wherein the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. 【請求項５】 ある特定の温度より低温側では温度によ
る検出出力の変動がなく高温側でのみ温度により検出出
力が変動する温度特性を有するセンサの温度特性を補正
する温度補正回路であって、高温側の温度特性を補正す
る温度補正部と、温度を検出する温度検出素子と、温度
検出素子の検出出力が上記特定の温度より高いときにの
み温度補正部を動作させる温度補正制御手段とを備えた
ことを特徴とするセンサの温度補正回路。5. A temperature correction circuit that corrects the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the lower temperature side than a certain specific temperature and the detection output fluctuates on the high temperature side only, A temperature correction unit that corrects the temperature characteristic on the high temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is higher than the specific temperature. A temperature correction circuit for the sensor, which is provided. 【請求項６】 温度補正部はセンサの出力を信号処理し
て検出出力を得る信号処理部の温度特性を補正すること
を特徴とする請求項５記載のセンサの温度補正回路。6. The temperature correction circuit for a sensor according to claim 5, wherein the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain a detection output. 【請求項７】 温度補正部はセンサの出力を所定の基準
値と比較して検出出力を得る比較部の基準値の温度特性
を補正することを特徴とする請求項５記載のセンサの温
度補正回路。7. The temperature correction of the sensor according to claim 5, wherein the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value. circuit. 【請求項８】 温度補正部はセンサの出力を増幅する増
幅部の温度特性を補正することを特徴とする請求項５記
載のセンサの温度補正回路。8. The temperature correction circuit for a sensor according to claim 5, wherein the temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor. 【請求項９】 ある特定の温度より高温側では温度によ
る検出出力の変動がなく低温側でのみ温度により検出出
力が変動する温度特性を有するセンサの温度特性を補正
する温度補正回路であって、低温側の温度特性を補正す
る温度補正部と、温度を検出する温度検出素子と、温度
検出素子の検出出力が上記特定の温度より低いときにの
み温度補正部を動作させる温度補正制御手段とを備えた
ことを特徴とするセンサの温度補正回路。9. A temperature correction circuit that corrects the temperature characteristic of a sensor having a temperature characteristic in which the detection output does not fluctuate due to temperature on the higher temperature side than a certain specific temperature and the detection output fluctuates only on the low temperature side, A temperature correction unit that corrects the temperature characteristic on the low temperature side, a temperature detection element that detects the temperature, and a temperature correction control unit that operates the temperature correction unit only when the detection output of the temperature detection element is lower than the specific temperature. A temperature correction circuit for the sensor, which is provided. 【請求項１０】 温度補正部はセンサの出力を信号処理
して検出出力を得る信号処理部の温度特性を補正するこ
とを特徴とする請求項９記載のセンサの温度補正回路。10. The temperature correction circuit for a sensor according to claim 9, wherein the temperature correction unit corrects the temperature characteristic of the signal processing unit that processes the output of the sensor to obtain a detection output. 【請求項１１】 温度補正部はセンサの出力を所定の基
準値と比較して検出出力を得る比較部の基準値の温度特
性を補正することを特徴とする請求項９記載のセンサの
温度補正回路。11. The temperature correction of the sensor according to claim 9, wherein the temperature correction unit corrects the temperature characteristic of the reference value of the comparison unit that obtains the detection output by comparing the output of the sensor with a predetermined reference value. circuit. 【請求項１２】 温度補正部はセンサの出力を増幅する
増幅部の温度特性を補正することを特徴とする請求項９
記載のセンサの温度補正回路。12. The temperature correction unit corrects the temperature characteristic of the amplification unit that amplifies the output of the sensor.
A temperature compensation circuit for the described sensor.
JP6290860A 1994-11-25 1994-11-25 Temperature correction circuit in sensor Withdrawn JPH08145715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6290860A JPH08145715A (en) 1994-11-25 1994-11-25 Temperature correction circuit in sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6290860A JPH08145715A (en) 1994-11-25 1994-11-25 Temperature correction circuit in sensor

Publications (1)

Publication Number Publication Date
JPH08145715A true JPH08145715A (en) 1996-06-07

Family

ID=17761435

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6290860A Withdrawn JPH08145715A (en) 1994-11-25 1994-11-25 Temperature correction circuit in sensor

Country Status (1)

Country Link
JP (1) JPH08145715A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004150240A (en) * 2002-11-01 2004-05-27 Matsushita Electric Ind Co Ltd Sanitary cleaning device
JP2006126021A (en) * 2004-10-29 2006-05-18 Sharp Corp Distance measurement sensor and instrument installing the same
CN102364305A (en) * 2010-06-18 2012-02-29 株式会社山武 Physical quantity sensor
WO2019176332A1 (en) * 2018-03-14 2019-09-19 富士電機株式会社 Sensor device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004150240A (en) * 2002-11-01 2004-05-27 Matsushita Electric Ind Co Ltd Sanitary cleaning device
JP2006126021A (en) * 2004-10-29 2006-05-18 Sharp Corp Distance measurement sensor and instrument installing the same
CN102364305A (en) * 2010-06-18 2012-02-29 株式会社山武 Physical quantity sensor
US8838404B2 (en) 2010-06-18 2014-09-16 Azbil Corporation Physical quantity sensor
WO2019176332A1 (en) * 2018-03-14 2019-09-19 富士電機株式会社 Sensor device
CN111094925A (en) * 2018-03-14 2020-05-01 富士电机株式会社 Sensor device
JPWO2019176332A1 (en) * 2018-03-14 2020-10-01 富士電機株式会社 Sensor device
US11422049B2 (en) 2018-03-14 2022-08-23 Fuji Electric Co., Ltd. Sensor device configured to reduce output errors due to temperature characteristics
CN111094925B (en) * 2018-03-14 2023-02-17 富士电机株式会社 Sensor device

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