JPH06109432A - Size measuring apparatus - Google Patents

Size measuring apparatus

Info

Publication number
JPH06109432A
JPH06109432A JP28518992A JP28518992A JPH06109432A JP H06109432 A JPH06109432 A JP H06109432A JP 28518992 A JP28518992 A JP 28518992A JP 28518992 A JP28518992 A JP 28518992A JP H06109432 A JPH06109432 A JP H06109432A
Authority
JP
Japan
Prior art keywords
light
detector
electric signal
signal
photodetector
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
Application number
JP28518992A
Other languages
Japanese (ja)
Other versions
JP2995124B2 (en
Inventor
Hisao Hara
久夫 原
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.)
Anritsu Corp
Original Assignee
Anritsu Corp
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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP4285189A priority Critical patent/JP2995124B2/en
Publication of JPH06109432A publication Critical patent/JPH06109432A/en
Application granted granted Critical
Publication of JP2995124B2 publication Critical patent/JP2995124B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To prevent the abnormal detection of a size measurement due to the contamination of the lens or the window of a light projector and a photodetector and to enhance the accuracy of the measurement in a size measuring apparatus wherein an object under test is irradiated with an optical beam radiated from the light projector, an electric signal from the photodetector which has received the beam is processed and the size of the object under test is measured in a noncontact manner. CONSTITUTION:A size measuring apparatus is provided with a light projector 1 which projects an optical beam onto an object under test and with a photodetector 2 which receives the optical beam 4 projected from the light projector 1 and which outputs an electric signal whose intensity corresponds to the strength and weakness (the light and darkness) of light brought by the object 5 under test. A first detector 9 which receives the electric signal output from the photodetector 2 and which detects the intensity of the optical beam 4 and a second detector 10 which detects the amplitude of the fluctuation of the electric signal are installed. In addition, the measuring apparatus is constituted of a monitoring device 13 which receives a signal from at least one out of the first detector 9 and the second detector 10 and which monitors the contamination of the light projector 1 or the photodetector 2.

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、投光器から発射された
光ビームを被測定物に照射して、受光した受光器からの
電気信号を処理することにより、非接触で被測定物の外
形、幅、位置等の寸法を測定する寸法測定装置に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention irradiates a light beam emitted from a light projector onto an object to be measured and processes an electric signal from the light receiver which has received the light beam, thereby non-contacting the outer shape of the object to be measured. The present invention relates to a dimension measuring device that measures dimensions such as width and position.

【0002】[0002]

【従来の技術】非接触形の寸法測定装置には、レーザ光
を利用したものがある。従来の装置は、図6に示すよう
に互いに対向して配置された投光器16と受光器17の
間に被測定物20が置かれ、投光器16からは光ビーム
19が発射され、被測定物20に照射される。光ビーム
19は、被測定物20に遮られた部分と遮られない部分
との明暗像として受光器17に受光され、電気信号に変
換される。この電気信号は、明暗像、すなわち明暗の空
間的な分布を電気量の強弱の空間的あるいは時間的分布
として表現したものである。
2. Description of the Related Art Some non-contact type dimension measuring devices utilize laser light. In the conventional device, an object to be measured 20 is placed between a light projector 16 and a light receiver 17 which are arranged to face each other as shown in FIG. 6, and a light beam 19 is emitted from the light projector 16 to measure the object to be measured 20. Is irradiated. The light beam 19 is received by the light receiver 17 as a light and dark image of a portion shielded by the DUT 20 and a portion not shielded, and is converted into an electric signal. This electric signal represents a bright and dark image, that is, a spatial distribution of light and dark as a spatial or temporal distribution of the amount of electricity.

【0003】受光器17において変換された電気信号
は、受光アンプ21で増幅され、2値化回路22、およ
び2値化レベル演算器23に出力される。2値化レベル
演算器23では、電気信号の強度(以下ピークレベルと
いう)を検出し、この強度をもとに電気信号のレベルの
高い部分と低い部分、つまり明暗像の明るい部分と暗い
部分とに対応する部分に分ける(2値化)ためのしきい
値を演算し、2値化回路22に出力する。
The electric signal converted by the photo detector 17 is amplified by the photo receiver amplifier 21 and output to the binarization circuit 22 and the binarization level calculator 23. The binarization level calculator 23 detects the intensity of the electric signal (hereinafter referred to as the peak level), and based on this intensity, the high and low parts of the electric signal, that is, the bright and dark parts of the bright and dark image are detected. A threshold value for dividing (binarization) into a portion corresponding to is calculated and output to the binarization circuit 22.

【0004】2値化回路22では、2値化レベル演算器
23からのしきい値をもとに受光アンプ21からの電気
信号を2値化し、明暗の中間の状態のない明暗信号を得
る。この明暗信号が表す明暗の境界は、被測定物5が光
ビーム4を遮る被測定物5のエッジ位置に対応している
から、明暗信号からエッジ位置検出器25において被測
定物5のエッジの位置を求めることができる。このエッ
ジの位置をもとに外径演算器26において被測定物20
の外径寸法等の数値が演算され、表示器27に出力され
る。
The binarization circuit 22 binarizes the electric signal from the light-receiving amplifier 21 based on the threshold value from the binarization level calculator 23 to obtain a bright / dark signal having no intermediate state between bright and dark. The boundary between the light and dark represented by the light and dark signal corresponds to the edge position of the object to be measured 5 where the DUT 5 blocks the light beam 4. Therefore, the edge position detector 25 detects the edge of the object to be measured 5 from the light and dark signal. The position can be calculated. Based on the position of this edge, the object to be measured 20 is measured by the outer diameter calculator 26.
Numerical values such as the outer diameter of the are calculated and output to the display 27.

【0005】この寸法測定機の受光器17において変換
される電気信号は、明暗信号の強弱(光の強弱)に比例
するものであり、外乱の影響を受けやすい。特に、投光
器16や受光器17のレンズあるいは窓18の汚れに起
因するものが多く、出力レベルの低下やゆらぎといった
障害が発生すると、正確な寸法の測定が困難となる。
The electric signal converted in the light receiver 17 of this size measuring machine is proportional to the intensity of the dark-light signal (intensity of light) and is easily affected by disturbance. In particular, this is often caused by dirt on the lens of the light projector 16 or the light receiver 17 or the window 18, and if a failure such as a decrease in output level or fluctuation occurs, it is difficult to accurately measure the dimensions.

【0006】従来、レンズや窓18の汚れによる電気信
号の出力レベルの低下に対して、電気信号のピークレベ
ルに合わせて2値化する際のしきい値を変化させること
により、測定値に対する影響を軽減する方法がある。ま
たアラーム信号を発生させていたものとしては、受光ア
ンプ21で増幅されたピークレベルを2値化レベル演算
器23によって検出し、このピークレベルと予め定めて
おいた汚れ監視のためのしきい値とを比較器24で比較
する方法がある。ピークレベルがしきい値より小さい値
の場合にアラーム信号を発生させ、表示器27に表示さ
せる。これらの方法によれば、投光器16、受光器17
のレンズや窓18が、例えば油膜のようなものにより膜
状に均一に汚れた場合は、電気信号のピークレベルの変
化から汚れの進行の具合が良く監視できるし、また、2
値化のためのしきい値が電気信号のピークレベルに比例
して設定されるため、測定値に対する影響もほとんどな
い。
Conventionally, with respect to a decrease in the output level of an electric signal due to contamination of the lens or the window 18, by changing the threshold value when binarizing according to the peak level of the electric signal, the influence on the measured value is affected. There is a way to reduce. Further, as the alarm signal being generated, the peak level amplified by the light receiving amplifier 21 is detected by the binarization level calculator 23, and this peak level and a predetermined threshold value for contamination monitoring are detected. There is a method of comparing and with the comparator 24. When the peak level is smaller than the threshold value, an alarm signal is generated and displayed on the display 27. According to these methods, the projector 16 and the light receiver 17
When the lens and the window 18 are uniformly soiled with an oil film or the like, the progress of the soiling can be well monitored from the change in the peak level of the electric signal, and
Since the threshold value for setting the value is set in proportion to the peak level of the electric signal, there is almost no influence on the measured value.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、従来は
わずかな汚れによる寸法測定の精度低下を避けるため
に、汚れ監視のためのしきい値をピークレベルに近いき
びしい値に設定していた。例えば図3の警戒レベルをピ
ークレベルの90%に設定していた。このため、精度に
対する要求がゆるい場合でも、投受光器のレンズや窓の
汚れが少しでも生じるとアラーム信号が発生し、過剰検
出となり、そのたびに測定を停止して点検しなければな
らなかった。また、投受光器のレンズや窓に、粒子の粗
い粉塵や、大きなゴミ等が付着した場合は、図5に示す
ように電気信号のピークレベルが変化しないでゆらぎの
み発生する。この場合は、ピークレベルは変化せず、し
きい値より大きな値となる。従来は、ピークレベルだけ
監視しているため、ゆらぎによるアラーム信号が発生せ
ず、投受光器のレンズや窓の汚れを見逃してしまう恐れ
があった。
However, in the past, in order to avoid a decrease in the accuracy of dimensional measurement due to slight dirt, the threshold value for dirt monitoring was set to a severe value close to the peak level. For example, the caution level in FIG. 3 was set to 90% of the peak level. For this reason, even if the requirement for accuracy is low, an alarm signal will be generated if the lens or window of the light emitter / receiver is slightly soiled, resulting in excessive detection, and the measurement must be stopped and inspected each time. . Further, when coarse dust particles or large dust adheres to the lens or window of the light emitter / receiver, the peak level of the electric signal does not change and only fluctuations occur as shown in FIG. In this case, the peak level does not change and becomes a value larger than the threshold value. Conventionally, since only the peak level is monitored, an alarm signal due to fluctuations is not generated, and there is a risk of overlooking dirt on the lens and window of the light emitter / receiver.

【0008】本発明は、このような事情に鑑みてなされ
たものであり、その目的は、投受光器のレンズや窓に、
油膜等の付着した場合に生ずるピークレベルの低下や、
粒子の粗い粉塵や、大きなゴミ等が付着した場合に生ず
る電気信号のゆらぎを検出し、過剰な異常検出を防ぐと
ともに、より信頼性が高く、外乱に対して迅速な対応が
できる寸法測定装置を提供することにある。
The present invention has been made in view of such circumstances, and an object thereof is to provide a lens and a window of a light emitter / receiver,
The decrease in peak level that occurs when an oil film etc. adheres,
A dimension measuring device that detects fluctuations in electrical signals that occur when coarse particles or large dust adheres to prevent excessive abnormality detection, is more reliable, and can respond quickly to external disturbances. To provide.

【0009】[0009]

【課題を解決するための手段】上記課題を解決するため
に、本発明の寸法測定装置は被測定物に対して光ビーム
を投射する投光器と、投光器から投射された光ビームを
受け被測定物によってもたらされる光の強弱(明暗)に
対応した強度を有する電気信号を出力する受光器とを備
えられ、この受光器から出力された電気信号を受けて光
ビームの強度を検出する第一の検出器と、電気信号のゆ
らぎの振幅を検出する第二の検出器とが設けられる。さ
らに、これらの第一の検出器および第二の検出器のうち
のすくなくとも一方からの信号を受けて、投光器または
受光器の汚れを監視する監視装置とから構成される。
In order to solve the above problems, a dimension measuring apparatus of the present invention is a projector for projecting a light beam onto an object to be measured, and an object to be measured which receives the light beam projected from the projector. A light receiver that outputs an electric signal having an intensity corresponding to the intensity (brightness and darkness) of the light that is caused by the first detection that receives the electric signal output from the light receiver and detects the intensity of the light beam. And a second detector for detecting the amplitude of the fluctuation of the electric signal. Further, it comprises a monitoring device for receiving a signal from at least one of the first detector and the second detector to monitor the contamination of the projector or the receiver.

【0010】[0010]

【作用】このように構成された寸法測定装置によれば、
第一および第二の検出器を設けることにより、電気信号
のピークレベルとゆらぎの両方を検出することができ、
投光器または受光器の汚れを過剰に検出することなく、
迅速に、もれなく検知できる。
According to the dimension measuring device configured as described above,
By providing the first and second detectors, it is possible to detect both the peak level and the fluctuation of the electric signal,
Without excessive detection of dirt on the sender or receiver,
It can be detected quickly and completely.

【0011】[0011]

【実施例】以下本発明の一実施例を図面を用いて説明す
る。図1はブロック図、図2は第一の検出器の詳細回路
図、図3は警戒判定レベル、異常判定レベルの設定例を
示す図、図4は第二の検出器の詳細回路図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a block diagram, FIG. 2 is a detailed circuit diagram of a first detector, FIG. 3 is a diagram showing an example of setting a warning determination level and an abnormality determination level, and FIG. 4 is a detailed circuit diagram of a second detector. .

【0012】光源である発光器1と、発光器1と対向し
て受光器2が設けられ、それらの間に被測定物5を配置
した状態で、発光器1からレーザ光の光ビーム4が発射
される。この光ビーム4は図示しない偏向器により平衡
に走査されている。光ビーム4は被測定物5によって遮
られ、時間的にその明暗が変わる像として受光器2に投
影される。受光器2はこの明暗像を電気信号に変換
し、、受光アンプ6に送出する。受光アンプ6は電気信
号を増幅して2値化回路7、2値化レベル演算回路8、
および第二の検出器10に送出する。
A light source 1 serving as a light source, and a light receiver 2 facing the light source 1 are provided, and an object 5 to be measured is placed between them. Is fired. The light beam 4 is scanned in a balanced manner by a deflector (not shown). The light beam 4 is blocked by the object to be measured 5 and projected on the light receiver 2 as an image in which the brightness changes with time. The light receiver 2 converts this bright and dark image into an electric signal and sends it to the light receiving amplifier 6. The light-receiving amplifier 6 amplifies the electric signal to binarize the circuit 7, binarization level operation circuit 8,
And to the second detector 10.

【0013】2値化回路7では受光アンプ6と2値化レ
ベル演算器8からの電気信号を受けて、明暗像の電気信
号を2値化し明暗信号とする。この明暗信号からエッジ
位置検出器11は、被測定物5により光ビーム4が遮ら
れるタイミングを検出し、さらに、この時間情報を光ビ
ーム4の走査位相との関係を用いてエッジの位置を読み
取る。このエッジの位置をもとに外径演算器12におい
て被測定物5の外径寸法等の数値が演算され、外径演算
器12によって算出された値はEL表示回路14に送出
され、EL表示器15に表示される。
The binarization circuit 7 receives the electrical signals from the light receiving amplifier 6 and the binarization level calculator 8 and binarizes the electrical signal of the bright and dark image to obtain the bright and dark signal. From this brightness signal, the edge position detector 11 detects the timing at which the light beam 4 is blocked by the DUT 5, and further reads the edge position by using this time information in relation to the scanning phase of the light beam 4. . Numerical values such as the outer diameter dimension of the DUT 5 are calculated in the outer diameter calculator 12 based on the position of this edge, and the value calculated by the outer diameter calculator 12 is sent to the EL display circuit 14 for EL display. It is displayed on the container 15.

【0014】一方、2値化レベル演算器8は、受光信号
のピークレベルを検出しており、それを第一の検出器9
および第二の検出器10に出力する。
On the other hand, the binarization level calculator 8 detects the peak level of the received light signal, which is detected by the first detector 9
And to the second detector 10.

【0015】第一の検出器9について説明すると、図
2、図3に示されるように、2値化レベル演算器8から
出力されたピークレベルは、比較器9aおよび比較器9
bにおいてそれぞれの判定レベルで比較判定され、比較
器9aからは警戒判定信号、比較器9bからは異常判定
信号として出力される。これら2つの判定レベルは汚れ
がないときのピークレベルを基準に設定され、例えば警
戒判定レベルVL(1)はピークレベルの80%、異常判定
レベルVL(2)はピークレベルの50%に設定される。
The first detector 9 will be described. As shown in FIGS. 2 and 3, the peak level output from the binarization level calculator 8 is the comparator 9a and the comparator 9a.
In b, comparison determination is performed at each determination level, and the comparator 9a outputs a warning determination signal and the comparator 9b outputs an abnormality determination signal. These two determination levels are set on the basis of the peak level when there is no dirt. For example, the warning determination level VL (1) is 80% of the peak level, and the abnormality determination level VL (2) is 50% of the peak level. Is set.

【0016】このように2段階に判定レベルを設けるこ
とで、汚れの進み具合が判定でき、警戒判定段階におい
て汚れを除去する処置をとることができる。判定レベル
は、使用環境、要求精度により変更することは可能であ
り、外部から変更設定することも可能である。
By thus providing the determination levels in two stages, it is possible to determine the degree of progress of the stain, and it is possible to take a measure to remove the stain in the warning determination stage. The determination level can be changed according to the usage environment and the required accuracy, and can be changed and set from the outside.

【0017】第二の検出器10は、第4図のように構成
され、受光信号のうち明部信号を取り出すため、比較器
10aが設けられている。比較器10aには、受光アン
プ6からの信号が入力され、さらに比較の基準レベルと
して、2値化レベル演算器8からピークレベルが取り出
され、例えば、その1/2となるレベルVS が作られ、
入力される。比較器10aの出力は、明部判定信号とな
り、光ビーム4が被測定物5に遮られていない時間を示
す。
The second detector 10 is constructed as shown in FIG. 4, and is provided with a comparator 10a for extracting the bright portion signal from the received light signal. To the comparator 10a is supplied with signals from the light receiving amplifier 6, further as a reference level of the comparator, the peak level from the binary level calculator 8 are taken out, for example, the level V S is created to be a half thereof The
Is entered. The output of the comparator 10a becomes a bright part determination signal and indicates the time when the light beam 4 is not blocked by the DUT 5.

【0018】しかし、この明部判定信号は、光ビーム4
の一部が被測定物5に遮られた状態でも明部として判定
しているため、明部のゆらぎを検出するための制御信号
として用いるには、光ビーム4全体が被測定物5に遮ら
れなくなる時間まで明状態を示さないようにする必要が
ある。このため、図5に示すように、この明部判定信号
と明部判定信号を遅延素子10cによってd2 だけ遅延
させたものとの論理積を論理積素子においてとり制御信
号を得る。このように明部判定信号と遅延させたものと
の論理積をとることにより、光ビーム4が被測定物5を
よぎって、ビーム全体が被測定物に遮られなくなる時間
まで明状態を示さない信号となる。
However, the bright area determination signal is the light beam 4
Even if a part of the light beam is blocked by the object to be measured 5, it is determined as a bright part. Therefore, in order to use it as a control signal for detecting the fluctuation of the bright part, the entire light beam 4 is blocked by the object to be measured 5. It is necessary not to show a bright state until the time when it cannot be controlled. Therefore, as shown in FIG. 5, a logical product of the bright part determination signal and the bright part determination signal delayed by d 2 by the delay element 10c is obtained in the logical product element to obtain the control signal. By taking the logical product of the bright part determination signal and the delayed one in this way, the light state is not shown until the time when the light beam 4 crosses the DUT 5 and the entire beam is not blocked by the DUT. Become a signal.

【0019】一方、受光信号を遅延素子10bで遅延時
間d1 だけ遅らせた信号と明状態を示す制御信号とは、
ピークピーク検出器10dへ入力される。このようにす
るとピークピーク検出、つまりゆらぎ幅の検出は、この
ピークピーク検出器10dにおいて、制御信号が明状態
を示しているときだけ行われる。遅延時間d1 は、光ビ
ーム4が被測定物5をよぎるに要する時間、すなわち光
ビーム4のビーム径を、光ビーム4が被測定物5をよぎ
るときの走査速度で除した値に若干の余裕をとって決定
し、遅延時間d2 は遅延時間d1 の約2倍としている。
このような構成にすると、ピークピーク検出器10dが
検出するピークピークレベルは、光ビーム4が被測定物
5に全く遮られないときの受光信号のゆらぎ幅となる。
On the other hand, the signal obtained by delaying the received light signal by the delay element 10b by the delay time d 1 and the control signal indicating the bright state are:
The peak is input to the peak detector 10d. In this way, peak-peak detection, that is, fluctuation width detection, is performed only when the control signal indicates a bright state in the peak-peak detector 10d. The delay time d 1 is a time required for the light beam 4 to cross the DUT 5, that is, a value obtained by dividing the beam diameter of the light beam 4 by the scanning speed when the light beam 4 crosses the DUT 5. It is determined with some margin, and the delay time d 2 is about twice the delay time d 1 .
With such a configuration, the peak-peak level detected by the peak-peak detector 10d becomes the fluctuation width of the received light signal when the light beam 4 is not blocked by the DUT 5 at all.

【0020】こうして得られたゆらぎ検出信号は、第一
の検出器9と同様に比較器10eおよび比較器10fに
より警戒判定レベルVL(3)と異常判定レベルVL(4)の2
段階に判定され、それぞれ警戒判定出力および異常判定
出力が得られる。第一の検出器9および第二の検出器1
0により検出されたピークレベルとゆらぎの値は、アラ
ーム信号として表示器あるいは警報器に送出され、さら
にこのアラーム信号を投光器または受光器の汚れを洗浄
する手段に送出してもよく、自動測定ラインとして利用
することもできる。
The fluctuation detection signal thus obtained is determined by the comparator 10e and the comparator 10f in the same manner as the first detector 9, and the warning judgment level VL (3) and the abnormality judgment level VL (4) are detected.
The judgment is made in stages, and the warning judgment output and the abnormality judgment output are obtained respectively. First detector 9 and second detector 1
The peak level and the fluctuation value detected by 0 are sent as an alarm signal to a display or an alarm device, and this alarm signal may be sent to a means for cleaning the dirt of the sender or the receiver. It can also be used as.

【0021】[0021]

【発明の効果】本発明は、以上説明したように第1の検
出器と第2の検出器によって検出されたピークレベルと
ゆらぎの値を利用することで、投光器または受光器の汚
れを過剰に検出することがないので、被測定物のライン
を止める回数を少なくできる。その上、投光器または受
光器の汚れの検出を高い確度で行うことができ、汚れに
よる不良品の数が不必要に増えることを防止できる。
As described above, the present invention makes use of the peak level and the fluctuation value detected by the first detector and the second detector to make the sender or the receiver excessively dirty. Since there is no detection, the number of times the line of the object to be measured is stopped can be reduced. In addition, it is possible to detect dirt on the light projector or the light receiver with high accuracy, and it is possible to prevent the number of defective products due to dirt from unnecessarily increasing.

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

【図1】本発明の装置のブロック図である。1 is a block diagram of an apparatus of the present invention.

【図2】本発明の第一の検出器の詳細回路である。FIG. 2 is a detailed circuit of the first detector of the present invention.

【図3】本発明のピークレベルを示す図である。FIG. 3 is a diagram showing peak levels of the present invention.

【図4】本発明の第二の検出器の詳細回路である。FIG. 4 is a detailed circuit of the second detector of the present invention.

【図5】本発明のゆらぎを示す図である。FIG. 5 is a diagram showing fluctuations of the present invention.

【図6】従来の装置のブロック図である。FIG. 6 is a block diagram of a conventional device.

【符号の説明】[Explanation of symbols]

1 投光器。 2 受光器。 3 レンズまたは窓。 4 光ビーム。 5 被測定物。 6 受光アンプ。 7 2値化回路。 8 2値化レベル演算器。 9 第一の検出器。 10 第二の検出器。 11 エッジ位置検出器。 12 外径演算器。 13 監視装置。 1 Floodlight. 2 Light receiver. 3 lens or window. 4 light beams. 5 DUT. 6 Light receiving amplifier. 7 Binarization circuit. 8 Binary level calculator. 9 First detector. 10 Second detector. 11 Edge position detector. 12 Outer diameter calculator. 13 Monitoring device.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】被測定物(5)に対して光ビーム(4)を
投射する投光器(1)と、前記投射された光ビームを受
け被測定物によってもたらされる光の強弱に対応した強
度を有する電気信号を出力する受光器(2)と、前記電
気信号を受けて、前記被測定物の寸法または形状を測定
する寸法測定装置であって、 前記電気信号から前記光ビームの強度を検出する第一の
検出器(9)と、前記電気信号のゆらぎの振幅を検出す
る第二の検出器(10)と、前記第一の検出器および前
記第二の検出器のうちの少なくとも一方からの信号を受
けて、前記投光器または受光器の汚れを監視する監視装
置(13)とを備えた寸法測定装置。
1. A light projector (1) for projecting a light beam (4) onto an object to be measured (5), and an intensity corresponding to the intensity of light received by the object to be measured which receives the projected light beam. A light receiver (2) for outputting an electric signal, and a size measuring device for receiving the electric signal and measuring the size or shape of the object to be measured, wherein the intensity of the light beam is detected from the electric signal. A first detector (9), a second detector (10) for detecting the amplitude of fluctuations of the electric signal, and at least one of the first detector and the second detector. A dimension measuring device comprising a monitoring device (13) which receives a signal and monitors the dirt of the light projector or the light receiver.
JP4285189A 1992-09-30 1992-09-30 Dimension measuring device Expired - Fee Related JP2995124B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4285189A JP2995124B2 (en) 1992-09-30 1992-09-30 Dimension measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4285189A JP2995124B2 (en) 1992-09-30 1992-09-30 Dimension measuring device

Publications (2)

Publication Number Publication Date
JPH06109432A true JPH06109432A (en) 1994-04-19
JP2995124B2 JP2995124B2 (en) 1999-12-27

Family

ID=17688263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4285189A Expired - Fee Related JP2995124B2 (en) 1992-09-30 1992-09-30 Dimension measuring device

Country Status (1)

Country Link
JP (1) JP2995124B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001027907A (en) * 1999-05-18 2001-01-30 General Electric Co <Ge> Method for predicting abnormal state via intelligent electronic device
US7253910B2 (en) 2004-07-22 2007-08-07 Mitutoyo Corporation Optical measuring device
US8169624B2 (en) 2009-04-24 2012-05-01 Keyence Corporation Transmissive dimension measuring device
JP2019035605A (en) * 2017-08-10 2019-03-07 日本発條株式会社 Measuring device
JP2019035604A (en) * 2017-08-10 2019-03-07 日本発條株式会社 Coil spring measuring device and coil spring manufacturing apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001027907A (en) * 1999-05-18 2001-01-30 General Electric Co <Ge> Method for predicting abnormal state via intelligent electronic device
US7253910B2 (en) 2004-07-22 2007-08-07 Mitutoyo Corporation Optical measuring device
US8169624B2 (en) 2009-04-24 2012-05-01 Keyence Corporation Transmissive dimension measuring device
JP2019035605A (en) * 2017-08-10 2019-03-07 日本発條株式会社 Measuring device
JP2019035604A (en) * 2017-08-10 2019-03-07 日本発條株式会社 Coil spring measuring device and coil spring manufacturing apparatus

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