JPS61102577A - Photoelectric switch for distance detection - Google Patents
Photoelectric switch for distance detectionInfo
- Publication number
- JPS61102577A JPS61102577A JP59224555A JP22455584A JPS61102577A JP S61102577 A JPS61102577 A JP S61102577A JP 59224555 A JP59224555 A JP 59224555A JP 22455584 A JP22455584 A JP 22455584A JP S61102577 A JPS61102577 A JP S61102577A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- amplifier circuit
- reference voltage
- logarithmic amplifier
- 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.)
- Granted
Links
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
［Ｉ支術分野１
本発明は、投受光光学系を側方に所定間隔を隔てて併置
し、投光光学系がら光ビームを照射し、被検知物本から
の反射光の集光点の変位を検出することによって、被検
知物体までの距離を検知するいわゆる距離検知用光電ス
イッチに関するらのである。[Detailed Description of the Invention] [Substantive Field 1] The present invention involves disposing light emitting and receiving optical systems side by side at a predetermined interval, emitting a light beam from the light emitting optical system, and detecting a light beam from an object to be detected. The present invention relates to a so-called distance detection photoelectric switch that detects the distance to a detected object by detecting the displacement of the focal point of reflected light.
［背景技術］
距離検知用充電スイッチは、第３図（、）に示すように
、投光器１１と投光光学系１２によって被検知物体Ｘに
光ビームＰを照射し、その反射光Ｒを受光光学系１によ
って集光し、集光面に配設されｒこ受光素子２の受光レ
ベルを基準電圧と比較することによって、被検知物体Ｘ
が所定エリア内にあることを検知するものであり、受光
素子２の出力は（ｂ）図に示すように、集光入ボッ）Ｓ
が移動するにつれて連続的１こ変化するので、施工現場
で基準レベルを設定することによって物体検知エリアを
決定する必要がある。[Background Art] As shown in FIG. 3(, ), a distance detection charging switch irradiates a light beam P onto a detected object X using a projector 11 and a projecting optical system 12, and transmits the reflected light R to a receiving optical system. The detected object
is within a predetermined area, and the output of the light receiving element 2 is as shown in the figure (b).
As the object moves, it continuously changes by 1, so it is necessary to determine the object detection area by setting a reference level at the construction site.
ｔｔＳ４図は従来のこの種の！ｒ！離検知用光電スイッ
チを示したもので、受光回路３の出力をオベアアンプＧ
とフィードバックグイオードＤよりなるに１数増幅回路
４を用いて対数変換することにより、グイナミノクレン
ンを拡大して近距離から遠距離主での検出を可能にして
いる。この信号を比較回路５１こ入力し、抵抗Ｒａ、Ｒ
１＋に上って設定された基準電圧Ｖｓと比較するのであ
るが、この対数増幅回路４は通常ンリフンダイオードの
対数特性を利用しており、その温度特性はＰＮ接合の温
度変化に伴なうキャリア濃度の変化などに依存している
ので、基準電圧設定用抵抗Ｒａ、Ｒｈにサーミスタなど
を用いることによって、対数増幅回路４と同等の温度特
性を持たせることは不可能であり、適切な温度補償方法
がなかった。The ttS4 diagram is of this kind! r! This shows the photoelectric switch for distance detection, and the output of the light receiving circuit 3 is connected to the obea amplifier G.
By performing logarithmic conversion using a single-number amplifier circuit 4 consisting of a feedback probe D and a feedback probe D, the probe magnification is enlarged to enable detection from a short distance to a long distance. This signal is input to the comparison circuit 51, and resistors Ra, R
This logarithmic amplifier circuit 4 normally utilizes the logarithmic characteristics of a Nrifun diode, and its temperature characteristics change with the temperature change of the PN junction. Since it depends on changes in carrier concentration, etc., it is impossible to provide the same temperature characteristics as the logarithmic amplifier circuit 4 by using a thermistor or the like for the reference voltage setting resistors Ra and Rh. There was no way to compensate.
そこで本発明者等は特願昭５８−７６８１８号において
、ｌ＊５図（ａ）に示すような温度補償方法を提案した
。同図において、基準電圧設定用の可変抵抗器７の出力
は第２の対数増幅回路９で増幅されて基準電圧Ｖｓとな
る。しかしこの構成によれば、対数増幅回路の温度ドリ
フＦが適正に補正される反面、可変抵抗器７の回転操作
量と検知設定距離との関係が非線形となり、同図（ｂ）
に示すように、遠距離側では僅かの回転角の変化Δθに
対して距離の変化６区が大きく高精度の設定が困難とな
るという問題があった。Therefore, the present inventors proposed a temperature compensation method as shown in Figure 1*5 (a) in Japanese Patent Application No. 58-76818. In the figure, the output of a variable resistor 7 for setting a reference voltage is amplified by a second logarithmic amplifier circuit 9 to become a reference voltage Vs. However, according to this configuration, although the temperature drift F of the logarithmic amplifier circuit is appropriately corrected, the relationship between the rotational operation amount of the variable resistor 7 and the detection setting distance becomes non-linear, as shown in FIG.
As shown in FIG. 2, there is a problem in that on the long distance side, the change in distance is large in 6 sections for a slight change in rotation angle Δθ, making it difficult to set with high accuracy.
［発明の目的１
本発明は上記の問題点に鑑み為されたものであり、その
目的とするところは、対数増幅回路に対して適正な温度
補償を行なうことができる上に、距離設定用可変抵抗器
の設定操作が容易な距離検知用充電スイッチを提供する
にある６
［発明の開示］
しかして本発明は、受光光学系の集光面に配設された受
光素子の出力を対数変換する対数増幅回路と、対数増幅
回路の出力を基準電圧と比較判別する比較回路とを備え
た距離検知用充電スイッチにおいて、基準電圧設定用可
変抵抗器の出力を指数変換する指数増幅回路と、指数増
幅回路の出力を対数変換する第２の対数増幅回路とを設
け、第２の対数増幅回路の出力を上記比較回路の基準電
圧とした点に特徴を有するものであり、温度補償のため
に止むを得ず第２の対数増幅回路を経由して対数変換さ
れる設定入力に、予め逆変換を施しておくことに上って
、可変抵抗器の回転操作角と設定距離との関係を線形に
保つようにしｔこものである。[Objective of the Invention 1 The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an appropriate temperature compensation for a logarithmic amplifier circuit, and to provide a variable distance setting system. To provide a charging switch for distance detection in which the setting operation of a resistor is easy.6 [Disclosure of the Invention] The present invention logarithmically transforms the output of a light-receiving element disposed on a light-converging surface of a light-receiving optical system. In a distance detection charging switch equipped with a logarithmic amplification circuit and a comparison circuit that compares and discriminates the output of the logarithmic amplification circuit with a reference voltage, the exponential amplification circuit that exponentially converts the output of a variable resistor for setting the reference voltage, and the exponential amplification A second logarithmic amplifier circuit for logarithmically converting the output of the circuit is provided, and the output of the second logarithmic amplifier circuit is used as the reference voltage of the comparison circuit. In addition to inversely converting the setting input that is inevitably logarithmically converted via the second logarithmic amplifier circuit, the relationship between the rotational operation angle of the variable resistor and the setting distance is maintained linearly. It's a small thing.
第１図（ａ）は本発明の実施例を示したもので、受光光
学系１の集光面−二配設された受光素子２の出力電流を
受光回路３で信号電圧に増幅変換したのち対数増幅回路
４″Ｃ対数変換し、対数増幅回路４の出力Ｖｉｎを比較
回路５によって基準電圧Ｖｓと比較し、その出力を負荷
制御用リレーなどよりなる出力回路６へ入力している。FIG. 1(a) shows an embodiment of the present invention, in which the output current of a light-receiving element 2 disposed on the light-converging surface of a light-receiving optical system 1 is amplified and converted into a signal voltage by a light-receiving circuit 3. Logarithmic amplifier circuit 4''C is subjected to logarithmic conversion, and the output Vin of logarithmic amplifier circuit 4 is compared with reference voltage Vs by comparator circuit 5, and the output is inputted to output circuit 6 consisting of a load control relay or the like.
また基準電圧設定用可変抵抗器７の出力は指数増幅回路
８で指数変換されたのち、第２の対数増幅回路９で対数
変換され、この対数増幅回路９の出力が基準電圧ＶＳと
して比較回路５に入力されている。このように構成すれ
ば、同図（ｂ）に示すように、可変抵抗器７の回転角と
それによって設定される検知限界距離とをほぼ比例させ
ることができる。Further, the output of the reference voltage setting variable resistor 7 is exponentially converted in an exponential amplifier circuit 8, and then logarithmically converted in a second logarithmic amplifier circuit 9. has been entered. With this configuration, the rotation angle of the variable resistor 7 and the detection limit distance set thereby can be made almost proportional, as shown in FIG. 2(b).
第２図は池の実施例を示したもので、パーキングメータ
のように充電スイッチを戸外で使用する場合の外光の（
〉管を相殺するために、集光面に併置された２個の受光
素子２ａ１２ｂの出力をそれぞｆＬ対数変換したのち差
動増幅回路１０に入力し、その差出力を比較回路４の信
号人力Ｖｉｎとしたものである。Figure 2 shows an example of a pond, and shows how the charging switch is used outdoors, such as a parking meter.
> In order to cancel the light intensity, the outputs of the two light-receiving elements 2a12b placed side by side on the condensing surface are each subjected to fL logarithmic conversion and then input to the differential amplifier circuit 10, and the difference output is used as the signal output of the comparison circuit 4. Vin.
【発明の効果１
上述のように本発明は、受光信号の対数増幅出力の温度
補償のために、基準電圧設定入力を第２の対数増幅回路
に通し、その設定入力に予め逆変換を施しておくことに
よって、可変抵抗器の回転 ″繰作角と設定距離との
関係を線形に保つようにしたものであるから、対数増幅
回路に対して適正な温度補償を行なうことができろ上に
、鉗離設定用可変抵抗器の設定ａ１ヤが容易に行なえる
という利点がある。Effect of the Invention 1 As described above, the present invention passes the reference voltage setting input through the second logarithmic amplifier circuit and inversely transforms the setting input in advance in order to compensate for the temperature of the logarithmically amplified output of the received light signal. Since the relationship between the rotation angle of the variable resistor and the set distance is maintained linearly by setting the variable resistor, appropriate temperature compensation can be performed for the logarithmic amplifier circuit.Furthermore, There is an advantage that the setting of the variable resistor for setting the separation can be easily performed.
第１図（、）は本発明の一実施例を示すブロック回路図
、同図（１＋）は同上の動１ヤ特性図、第２図は池の実
施例を示すブロック回路図、第３図（ａ）（ｂ）は本発
明の詳細な説明図、第４図は従来例を示すブロック回路
図、第５図（、）は他の従来例を示すプロ／り回路図、
（ｂ）は同上の動作特性図である６１は受光光学系、２
は受光素子、３は受光回路、４は対数増幅回路、５は比
較回路、６は出力回路、７は可変抵抗器、８は指数回路
、９は第２の対数増幅回路、ｌＯは差動増幅回路、Ｖｓ
は基準電圧。
代理人 弁理士 石 １）艮 七
第１ 図（０）
第１図（ｂ）
第４図
ム
（○）
第５図
（ｂ）
跳
駄
手続補正帯（自発）
昭和６０年 １月２１日
特許庁長官殿 情ト１、事件の
表示
昭和５９年特許願第２２４５５５号
２、発 明 の名称
コつプン
光電スイ・リチ（名称変更）
３ 補正をする者
事件との関係 特許出願人性 所 大
阪府門真市太字門真１０４８番地名 称 （５８３）松
下電工株式会社
代表者小 林 郁
４、代理人
５、補正命令の日付
訂正明細書
特願昭５９−２２４５５５号
１、発明の名称
充電スイッチ
２、特許請求の範囲
（１）受光光学系の集光面に配設された受光素子の出力
を対数変換する対数増幅回路と、対数増幅回路の出力を
基準電圧と比較判別する比較回路とを備えた笈ｌんＬユ
立において、基準電圧設定用可変抵抗器の出力を指数変
換する指数増幅回路と、指数増幅回路の出方を対数変換
する第２の対数増幅回路とを設け、第２の対数増幅回路
の出力を上比較回路の基準電圧としたことをｖｆ′？ｉ
ｌとするＬスイッチ。
、発明の詳細な説明
［技術分野］
本発明は投光器によって被検知物体に光ビーム照射し、
その拡散反射光を受光器で受光して披知物体の有無を検
知する反ｉｔ型の充電スインチ関するものである。
［背景技術］
反射型充電スイッチは第２図に示すように、物体表面か
らの拡散反射光を受光素子２で受光し、受光回路３で電
圧信号に変換したのも、対数増幅回路４で対数変換し、
この出力Ｖｉｎを物体検知用比較回路５に入力して、感
度を調整するための検知レベル設定電圧Ｖｓと比較し、
Ｖｉｎの方が大きいときには検知信号を出力する。信号
処理回路１０では投光器がら光ビームを発生させている
パルスタイミングで比較回路５の出力をサンプリングす
ることにより外光ノイズを除去しており、この信号処理
回路１０の出力をリレーや表示ランプを駆動するための
出力回路６に加えている。対数増幅回路４はオペアンプ
ＧとフィードバックダイオードＤを用いて受光信号出力
を対数変換することにより、物体までの距離と検出信号
レベルとを比例させてグイナミ・ンクレンジを拡大し、
精度の高い検出を可能にするものである。従来はこの信
号を比較回路５に入力して、抵抗Ｒａ、Ｒｂによって設
定された基準電圧Ｖｓと比較しでいたのであるが、対数
増幅回路４はシリコングイオードの対数特性を利用して
、その温度特性はＰＮ接合の温度変化に伴なうキャリア
濃度の変化などに依存しているので、例えば基準電圧設
定用抵抗Ｒａ＋Ｒｈにサーミスタなどの感温素子を用い
ることにより対数増幅回路４と同等の温度特性を持たせ
ることは不可能であり、適切な温度補償方法がなかった
。
そこで本発明者等は特願昭５８−７６３１８号において
、第３図（、）に示すような温度補償方法を提案した。
同図において、基準電圧設定用の可変抵抗器７の出力は
第２の対数増幅回路９で増幅されて基準電圧Ｖｓとなる
。このように構成すれば、第１の対数増幅回路４の温度
ドリフトは第２の対数増幅回路９の温度ドリフＦと相殺
されて適正に補正されるのである力←、その反面、基準
電圧設定用可変抵抗３７の回転繰作量と検知可能距離と
の関係が非線形となり、同図（ｂ）に示すように、遠距
龍側はど僅かの回転角の変化へ〇に対して距離の変化Δ
αが大きくなり、精度の高い設定が困難となるという問
題があった。
［発明の目的１
本発明は上記の問題点に鑑み為されたものであり、その
目的とするところは、対数増幅回路に対して適正な温度
補償を行なうことができる上に、感度設定用可変抵抗器
の設定振作が容易な充電スイッチを提供するにある。
［発明の開示］
しかして本発明は、受光光学系の集光面に配設された受
光素子の出力を対数変換する対数増幅回路と、対数増幅
回路の出力を基準電圧と比較判別する比較回路とを備え
た充電スイッチにおいて。
基準電圧設定用可変抵抗器の出力を指数変換する指数増
幅回路と、指数増幅回路の出力を対数変換する第２の対
数増幅回路とを設け、第２の対数増幅回路の出力を上記
比較回路の基準電圧とした点に特徴を有するものであり
、温度補償のために止むを得ず第２の対数増幅回路を経
由して対数変換される基準電圧設定用入力に、予め逆変
換を施しておくことによって、可変抵抗器の回転捏作角
と検知限界１［ｉ離との関係を線形に保つようにしたも
のである。
第１図（ａ）は本発明の実施例を示したちので、受光光
学系１の集光面に配設された受光素子２の出力電流を受
光回路３で信号電圧に増幅変換したのち対数増幅回路４
で対数変換し、対数増幅回路４の出力Ｖｉｎを比較回路
５によって基準電圧■＄と比較して、その出力を負荷制
御用リレーなどよりなる出力回路６へ入力している。＊
ｔこ基準電圧設定用可変抵抗器７の出力は指数増幅回路
８て・指数変換されたのち、第２の対数増幅回路９で′
Ｎ数変換され、この対数増幅回路９の出力が基準電圧Ｖ
ｓとして比較回路５に入力されている。このように構成
すれば、（（ｂ）に示すように、可変抵抗器７の回転角
とそれに上って設定される検知限界距離とをほぼ比例さ
せることができる。
［発明の効果］
上述のように本発明は、受光信号の対数増幅出力の温度
補償のために、基準電圧設定入力を第２の対数増幅回路
に通し、その設定入力に予め逆変換を施してお（ことに
よって、可変抵抗器の回転操作角と設定感度との関係を
線形に保つようにしたものであるから、対数増幅回路に
対して適正な温度補償を行なうことができる上に、基準
電圧設定用可変抵抗器の設定操作が容易に行なえるとい
う利点がある６
４、図面の簡単な説明
第１図（ａ）は本発明の一実施例を示すブロック回路図
、同図（ｂ）は同上の動作特性図、第２図は従来例を示
すブロック回路図、第３図（ａ）は他の従来例を示すブ
ロック回路図、同図（ｂ）は同上の動作特性図である。
代理人 弁理士 石 １）長 七
尚、添付図面の第１図、第２図および第３図を訂正し、
ｔｊＳＡ図および第５図を削除しよす。
第１ 図
（ｂ）
可喪抵、に各の１司法轡Fig. 1 (,) is a block circuit diagram showing an embodiment of the present invention, Fig. 1 (1+) is a dynamic characteristic diagram of the same as above, Fig. 2 is a block circuit diagram showing an embodiment of the pond, Fig. 3 (a) and (b) are detailed explanatory diagrams of the present invention, FIG. 4 is a block circuit diagram showing a conventional example, and FIG. 5 (,) is a professional circuit diagram showing another conventional example,
(b) is the same operating characteristic diagram as above. 61 is the light receiving optical system, 2
is a light receiving element, 3 is a light receiving circuit, 4 is a logarithmic amplifier circuit, 5 is a comparison circuit, 6 is an output circuit, 7 is a variable resistor, 8 is an exponential circuit, 9 is a second logarithmic amplifier circuit, lO is a differential amplifier circuit, Vs
is the reference voltage. Agent Patent Attorney Ishi 1) Ai Figure 7 1 (0) Figure 1 (b) Figure 4 Mu (○) Figure 5 (b) Jump procedure amendment band (spontaneous) Patented on January 21, 1985 Information to the Director-General of the Agency 1. Indication of the case Patent Application No. 224555 filed in 1982 2. Name of the invention Kotsupun Photoden Sui Richi (name changed) 3. Relationship with the case by the person making the amendment Patent applicant Location Osaka Prefecture 1048 Bold Kadoma, Kadoma City Title (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent 5, Specification for correction of date of amendment order Special Application No. 59-224555 1, Name of invention Charging switch 2, Patent Claims (1) A lamp equipped with a logarithmic amplifier circuit that logarithmically converts the output of a light receiving element disposed on a light collecting surface of a light receiving optical system, and a comparison circuit that compares and discriminates the output of the logarithmic amplifier circuit with a reference voltage. In the L-YU stand, an exponential amplification circuit that exponentially converts the output of the variable resistor for setting the reference voltage and a second logarithmic amplification circuit that logarithmically converts the output of the exponential amplification circuit are provided, and the second logarithmic amplification circuit is provided. The output of the circuit is used as the reference voltage of the upper comparison circuit, which is vf'? i
L switch. , Detailed Description of the Invention [Technical Field] The present invention irradiates a detected object with a light beam using a projector,
This invention relates to an IT-type charging switch that detects the presence or absence of a display object by receiving the diffusely reflected light with a light receiver. [Background Art] As shown in FIG. 2, the reflective charging switch receives diffusely reflected light from the surface of an object with a light receiving element 2, converts it into a voltage signal with a light receiving circuit 3, and converts it into a voltage signal with a logarithmic amplifier circuit 4. Converted,
This output Vin is input to the object detection comparison circuit 5 and compared with the detection level setting voltage Vs for adjusting the sensitivity,
When Vin is larger, a detection signal is output. The signal processing circuit 10 removes external light noise by sampling the output of the comparator circuit 5 at the pulse timing when the light beam is generated by the projector, and the output of this signal processing circuit 10 is used to drive a relay or an indicator lamp. It is added to the output circuit 6 for this purpose. The logarithmic amplifier circuit 4 uses an operational amplifier G and a feedback diode D to logarithmically convert the received light signal output, thereby making the distance to the object proportional to the detection signal level and expanding the range.
This enables highly accurate detection. Conventionally, this signal was input to the comparator circuit 5 and compared with the reference voltage Vs set by the resistors Ra and Rb, but the logarithmic amplifier circuit 4 utilizes the logarithmic characteristics of the silicon diode. Since the temperature characteristics depend on changes in carrier concentration due to temperature changes in the PN junction, for example, by using a temperature sensing element such as a thermistor for the reference voltage setting resistor Ra+Rh, the temperature can be adjusted to the same temperature as that of the logarithmic amplifier circuit 4. It was impossible to create such characteristics, and there was no suitable temperature compensation method. Therefore, the present inventors proposed a temperature compensation method as shown in FIG. 3(,) in Japanese Patent Application No. 58-76318. In the figure, the output of a variable resistor 7 for setting a reference voltage is amplified by a second logarithmic amplifier circuit 9 to become a reference voltage Vs. With this configuration, the temperature drift of the first logarithmic amplifier circuit 4 is canceled out by the temperature drift F of the second logarithmic amplifier circuit 9 and corrected appropriately. The relationship between the amount of rotation of the variable resistor 37 and the detectable distance becomes non-linear, and as shown in FIG.
There was a problem in that α became large, making it difficult to set with high precision. [Objective of the Invention 1 The present invention has been made in view of the above-mentioned problems, and its purpose is to perform appropriate temperature compensation for a logarithmic amplifier circuit, and to provide a variable sensitivity setting method. The setting of the resistor is to provide an easy charging switch. [Disclosure of the Invention] The present invention provides a logarithmic amplifier circuit that logarithmically converts the output of a light receiving element disposed on a light collecting surface of a light receiving optical system, and a comparison circuit that compares and discriminates the output of the logarithmic amplifier circuit with a reference voltage. In a charging switch equipped with. An exponential amplifier circuit that exponentially converts the output of the reference voltage setting variable resistor and a second logarithmic amplifier circuit that logarithmically converts the output of the exponential amplifier circuit are provided, and the output of the second logarithmic amplifier circuit is converted to the output of the comparison circuit. The feature is that the reference voltage is used as a reference voltage, and the reference voltage setting input, which is unavoidably logarithmically converted via a second logarithmic amplifier circuit for temperature compensation, is inversely converted in advance. By doing this, the relationship between the rotation angle of the variable resistor and the detection limit 1[i distance] is kept linear. Since FIG. 1(a) shows an embodiment of the present invention, the output current of the light receiving element 2 disposed on the light collecting surface of the light receiving optical system 1 is amplified and converted into a signal voltage by the light receiving circuit 3, and then logarithmically amplified. circuit 4
The output Vin of the logarithmic amplifier circuit 4 is compared with the reference voltage ■$ by a comparator circuit 5, and the output is input to an output circuit 6 consisting of a load control relay or the like. *
The output of the reference voltage setting variable resistor 7 is converted into an exponential signal by an exponential amplifier circuit 8, and then converted into a second logarithmic amplifier circuit 9.
The output of this logarithmic amplifier circuit 9 is converted to the reference voltage V.
It is input to the comparator circuit 5 as s. With this configuration, as shown in (b), the rotation angle of the variable resistor 7 and the detection limit distance set above it can be made almost proportional. [Effects of the Invention] The above-mentioned According to the present invention, in order to compensate for the temperature of the logarithmically amplified output of the received light signal, the reference voltage setting input is passed through a second logarithmically amplifying circuit, and the setting input is inversely converted in advance. Since the relationship between the rotary operation angle of the device and the set sensitivity is maintained linearly, it is possible to perform appropriate temperature compensation for the logarithmic amplifier circuit, and also to adjust the setting of the variable resistor for setting the reference voltage. It has the advantage of being easy to operate6 4. Brief description of the drawings Figure 1(a) is a block circuit diagram showing one embodiment of the present invention, Figure 1(b) is an operational characteristic diagram of the same, and Figure 1(b) is a block circuit diagram showing an embodiment of the present invention. Fig. 2 is a block circuit diagram showing a conventional example, Fig. 3 (a) is a block circuit diagram showing another conventional example, and Fig. 3 (b) is an operational characteristic diagram of the same as above. Agent Patent Attorney Ishi 1) Chief Seven Ministers have corrected Figures 1, 2 and 3 of the attached drawings,
Delete the tjSA diagram and Figure 5. Figure 1 (b) One judicial order for each
Claims (1)
を対数変換する対数増幅回路と、対数増幅回路の出力を
基準電圧と比較判別する比較回路とを備えた距離検知用
光電スイッチにおいて、基準電圧設定用可変抵抗器の出
力を指数変換する指数増幅回路と、指数増幅回路の出力
を対数変換する第２の対数増幅回路とを設け、第２の対
数増幅回路の出力を上記比較回路の基準電圧としたこと
を特徴とする距離検知用光電スイッチ。(1) A photoelectric sensor for distance detection equipped with a logarithmic amplifier circuit that logarithmically converts the output of the light receiving element disposed on the light collecting surface of the light receiving optical system, and a comparison circuit that compares and discriminates the output of the logarithmic amplifier circuit with a reference voltage. The switch is provided with an exponential amplification circuit that exponentially converts the output of the reference voltage setting variable resistor and a second logarithmic amplification circuit that logarithmically converts the output of the exponential amplification circuit, and the output of the second logarithmic amplification circuit is A photoelectric switch for distance detection, characterized in that it is used as a reference voltage for a comparison circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59224555A JPS61102577A (en) | 1984-10-25 | 1984-10-25 | Photoelectric switch for distance detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59224555A JPS61102577A (en) | 1984-10-25 | 1984-10-25 | Photoelectric switch for distance detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61102577A true JPS61102577A (en) | 1986-05-21 |
| JPH0332029B2 JPH0332029B2 (en) | 1991-05-09 |
Family
ID=16815614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59224555A Granted JPS61102577A (en) | 1984-10-25 | 1984-10-25 | Photoelectric switch for distance detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61102577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63121330A (en) * | 1986-11-11 | 1988-05-25 | Nec Corp | Transmission performance monitor circuit of radio equipment |
-
1984
- 1984-10-25 JP JP59224555A patent/JPS61102577A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63121330A (en) * | 1986-11-11 | 1988-05-25 | Nec Corp | Transmission performance monitor circuit of radio equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0332029B2 (en) | 1991-05-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |