JPS61219886A - Transmission type photoelectric sensor having plural detection levels - Google Patents
Transmission type photoelectric sensor having plural detection levelsInfo
- Publication number
- JPS61219886A JPS61219886A JP60062421A JP6242185A JPS61219886A JP S61219886 A JPS61219886 A JP S61219886A JP 60062421 A JP60062421 A JP 60062421A JP 6242185 A JP6242185 A JP 6242185A JP S61219886 A JPS61219886 A JP S61219886A
- Authority
- JP
- Japan
- Prior art keywords
- light
- level
- section
- detection
- signal
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光により物体の有無を検知する透過形光電セ
ンサーに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission type photoelectric sensor that detects the presence or absence of an object using light.
近年の機械装置は、省力化・多品種化の傾向とともにそ
の制御もますますa!M且つ大規模化している。そのよ
うな状況の中で、制御の要めとなるセンサーの信頼性の
向上及び多機能化は産業界全体で強く望まれている。In recent years, mechanical devices have become more labor-saving and more diverse, and their control has also become more demanding. M and increasing in scale. Under such circumstances, there is a strong desire throughout the industry to improve the reliability and increase the functionality of sensors, which are the key to control.
この種のセンサーには多くの種類があるが、なかでも元
によシ物体の有無を検知する光電センサーはその信頼性
及び応用性の高さにより機械装置の劃−には必要不可欠
なセンサーの1つとなっている。There are many types of sensors of this type, but among them, photoelectric sensors, which detect the presence or absence of foreign objects, are essential sensors for the operation of mechanical equipment due to their high reliability and applicability. There is one.
一般に、透過形光電センサーは、光を発する投光部に対
向して適当な間隔をあけ受光部を配置し。Generally, in a transmission type photoelectric sensor, a light receiving part is placed opposite a light projecting part that emits light, with an appropriate distance therebetween.
投光部からの光が受光部の表面にあたるように設置炙る
。したがって1通常は受光部表面で投光部からの光を受
光し続けることになるが、投光部と受光部間に光をさえ
ぎる物体が存在する場合には受光部表面に投光部からの
光は到達しなくなる。Set up so that the light from the light emitter hits the surface of the light receiver. Therefore, 1. Normally, the surface of the light receiving section will continue to receive the light from the light emitting section, but if there is an object blocking the light between the light projecting section and the light receiving section, the surface of the light receiving section will continue to receive the light from the light emitting section. Light will no longer reach you.
この投光部から受光部に到達する光量の変化で物体の有
無を検出している。The presence or absence of an object is detected by changes in the amount of light reaching the light receiving section from the light projecting section.
従来の透過形元電センサーは第2図の構成ブロック図に
示すように、光信号11を発する投光部lと、受光した
光信号11t−電気信号12に変換する受光部2と、電
気信号12を電気信号13に増幅部3と、電気信号13
を検出レベルと比較してその結果を2値化して電気信号
14として出力するレベル判別部4と、’を気信号14
i外部出力15として外部に出力する出力回路5とから
構成される。As shown in the block diagram of FIG. 2, the conventional transmission type electric sensor includes a light projecting section l that emits an optical signal 11, a light receiving section 2 that converts the received optical signal 11t into an electrical signal 12, and an electrical signal. 12 into an electrical signal 13 and an amplifying section 3, which converts the electrical signal 13 into an electrical signal 13.
a level discriminator 4 which compares ' with a detection level, binarizes the result and outputs it as an electrical signal 14;
It is composed of an output circuit 5 that outputs an output to the outside as an external output 15.
上述した従来の透過形光電センサーは、検出レベルが1
つしか存在しないため、投光部又は受光部の表面が汚損
もしくは水滴等の異物の付着により・劣化したシ投光部
・受光部間の光軸がずれる等の原因から、光の到達力が
弱まった場合でもその発見が困−で、その結果として検
出の誤動作が発生する要因の1つとなっていた。The conventional transmission type photoelectric sensor mentioned above has a detection level of 1
Because only one light beam exists, the light reaching power may be affected by the surface of the light emitting part or light receiving part being dirty or due to adhesion of foreign substances such as water droplets, or due to deterioration of the optical axis between the light emitting part and the light receiving part, etc. Even when it has weakened, it is difficult to detect it, which is one of the causes of detection malfunctions.
また、検出対象ごとに、その透明度及び形状・大きさが
異なった場合、それに伴って物体を検出するうえで最適
な検出レベルになるように増幅部の感度をあらかじめ調
整しておく必要があった。Additionally, if the transparency, shape, and size of each object to be detected differed, it was necessary to adjust the sensitivity of the amplification section in advance to achieve the optimal detection level for detecting the object. .
したがって、検出感度が太き(異なるような2線類以上
の対象が連続して送られてくるような装置の場合、セン
サーを2つ以上配置する必要がありた。Therefore, in the case of a device with a high detection sensitivity (in the case of a device in which two or more different types of targets are sent in succession, it is necessary to arrange two or more sensors).
本発明の目的は、上述の欠点を除去し、投光部・受光部
間に光をさえぎる切体が存在しないにも拘わらず他の原
因で尤の到達力が弱まった場合にはそのセンサーの劣化
を外部で償却町i粍とし、他の用途として検出感度の異
なる2つ以上の対Jl途中で感度調整せずに検出可+i
Uとする透過形元電センサーを提供することにある。It is an object of the present invention to eliminate the above-mentioned drawbacks, and to prevent the sensor from reaching the area where the light reaching power is weakened due to other reasons even though there is no cutter blocking the light between the light emitting part and the light receiving part. Deterioration can be amortized externally, and for other applications, it is possible to detect two or more pairs with different detection sensitivities without adjusting the sensitivity in the middle.
The object of the present invention is to provide a transmission type electric sensor named U.
本発明によれば、光を投光する投光部と、受光した光を
電気信号に変換する受光部と、受光部で光電変換された
信号を増幅する増幅部と、増幅部で増幅された信号を複
数の検出レベルで判定し。According to the present invention, there is provided a light projecting section that projects light, a light receiving section that converts the received light into an electrical signal, an amplifying section that amplifies the signal photoelectrically converted in the light receiving section, and a signal amplified by the amplifying section. Judge signals at multiple detection levels.
その結果をその検出レベルに対応した出力回路に2値化
して出力するレベル判別部と、レベル半別部からの各検
出レベルごとに対応した2値化信号を外部に出力する出
力回路と會含むことを%隊とする透過形党電センサーが
得られる。It includes a level discrimination unit that binarizes and outputs the result to an output circuit corresponding to the detection level, and an output circuit that outputs to the outside a binarized signal corresponding to each detection level from the level half division unit. A transmission-type power sensor that uses this as a percentage can be obtained.
次に2本発明の実施例について1図面を参照して詳細に
説明する。Next, two embodiments of the present invention will be described in detail with reference to one drawing.
第1図は1本発明の一実施例を示す構成ブロック図で、
光信号11を発する投光部lと、受光した光信号11を
電気信号12に変換する受光部12と、を気信号12を
電気信号13に増幅する増幅部3と、増幅部3を検出レ
ベルa〜dと比較してその結果を2値化して電気信号1
42〜14dとして各出力回路53〜5dに出力するレ
ベルa判別部及びレベルb判別部及びレベルC判別部及
びL/ /</L/ d判別部と、m気1d号14a−
14d t−それぞれ外部出力158〜15dとして出
力する出力回路5a〜5dとから構成される。FIG. 1 is a configuration block diagram showing an embodiment of the present invention.
A light projecting section l that emits an optical signal 11, a light receiving section 12 that converts the received optical signal 11 into an electrical signal 12, an amplifying section 3 that amplifies the electrical signal 12 into an electrical signal 13, and an amplifying section 3 that converts the optical signal 11 into an electrical signal 13; Compare a to d and binarize the results to generate electrical signal 1
A level a discrimination section, a level b discrimination section, a level C discrimination section, and a L/ /</L/ d discrimination section, which are outputted as 42 to 14d to each output circuit 53 to 5d, and the mki 1d 14a-
14d and t-output circuits 5a to 5d that output as external outputs 158 to 15d, respectively.
さて、レベル判別部は入力!fi信号が検出レベル以上
のときは外部出力ft0Nとし、検出レベル以下のとき
は外部出力がOF Fとなるよう番こ論理設定されてい
るとし、検出レベルaはもっとも高い信号レベルで、以
下検出レベルb、c、dの順に信号レベルが低(なるよ
う、且つ投光部・受光部間に光をさえぎる物体が存在し
ない場合には外部出力15a〜dがすべてONL投光部
・受光部間の光を遮断した場合には外部出力15a−=
d がすべてOFFされるように設定する。Now, enter the level determination section! The logic is set so that when the fi signal is above the detection level, the external output is ft0N, and when it is below the detection level, the external output is OFF.Detection level a is the highest signal level, and below the detection level If the signal level is low in the order of b, c, and d, and there is no object blocking the light between the emitter and receiver, the external outputs 15a to 15d are all output between the ONL emitter and receiver. When light is blocked, external output 15a-=
Set so that all d are turned off.
例えば、検出感度の異なる検出物C,Dがあって、検出
物Cは検出レベルdを越えるが検出レベルCは越えない
ような検出感度で、検出物りは検出レベルdを越えない
検出感度をもつとすると。For example, there are detectable objects C and D with different detection sensitivities, and detectable object C has a detection sensitivity that exceeds detection level d but does not exceed detection level C, and detectable object has a detection sensitivity that does not exceed detection level d. If you think about it.
検出レベルc、dに対応する外部出力15c、dを監視
すれば検出物C,Dの検出が可能である。Objects C and D can be detected by monitoring external outputs 15c and 15d corresponding to detection levels c and d.
また・外部出力15aまたは15bがOFFして外部出
力15Cまたは15dがONするような場合、検出物C
又はD以外の原因による受光量の変化と判断できる。す
なわち投光部または受光部の表面の汚損等による劣化も
しくは光軸のずれ等を検知できる。In addition, when the external output 15a or 15b is OFF and the external output 15C or 15d is ON, the detected object C
Alternatively, it can be determined that the change in the amount of light received is due to a cause other than D. That is, it is possible to detect deterioration due to contamination or the like on the surface of the light projector or the light receiver, or a shift in the optical axis.
従って、投光部1又は受光部2の表面が汚損もしくは水
滴等の異物の付着により劣化した9投光部lと受光部2
間の光軸がずれる等の要因から。Therefore, the surface of the light emitting part 1 or the light receiving part 2 has deteriorated due to dirt or foreign matter such as water droplets.
Due to factors such as misalignment of the optical axis between the two.
光の到達力が弱まった場合には、光をさえぎる物体が存
在しない条件下でも上位の検出レベルに対応する外部出
力からOFFしてゆくので、比較的早期に発見できる。If the light reaching power is weakened, it can be detected relatively early because the external output corresponding to the higher detection level is turned off even under the condition that there is no object blocking the light.
また、他の用途として、検出対象間で透明度・形状・大
きさ等の相違により最適な検出レベルが異なる場合でも
検出対象ごとにそれに対応する検出レベルを調整してお
けばそのレベルに対応する外部出力のON・OF Fを
監視することによシ。In addition, as another application, even if the optimal detection level differs between objects to be detected due to differences in transparency, shape, size, etc., it is possible to adjust the detection level corresponding to each object to be detected, so that the external By monitoring the ON/OFF status of the output.
光の検出感度が異なった複数の検出対象も1つのセンサ
ーで検出できる。A single sensor can detect multiple detection targets with different light detection sensitivities.
尚、ここでは検出レベルの個数は4つとしたが。Note that here, the number of detection levels is four.
この個数が可変なことはいうまでもない。Needless to say, this number is variable.
本発明の透過形光電センサーは1以上説明したように、
受光した光量を複数の検出レベルで判定し、その結果を
2値化してその検出レベルに対応が汚損もしくは水筒等
の異物の付着により劣化したシ投光部・受光部間の元軸
がずれたりして、光の到達力が弱まった場合にも検出可
能で、且つ<r用途として元の検出感度が異なった複数
の検出対象も1つのセンサーで検出できるという効果が
ある。As explained above, the transmission type photoelectric sensor of the present invention has the following features:
The amount of received light is judged at multiple detection levels, and the results are binarized and the corresponding detection level is determined. If the original axis between the light emitting part and the light receiving part is shifted, This has the effect that it is possible to detect even when the reaching power of light is weakened, and that a single sensor can detect a plurality of detection targets with different original detection sensitivities for <r applications.
第1図は本発明の一実施例を示す透過形光電センサーの
構成ブロック図、第2図は従来の透過形光電センサーの
構成ブロック図である。
l・・・・・・投光部、2・・・・・・受光部、3・・
・・・・増幅部、4・・・・・・レベル判別fB、4
a・・・・・・レベルa判別部、4b・・・・・・レベ
ルb 44JM部、4c・・・・・・レベルC44J
刷部、4d・・・・・・レベルd判別部、5・・・・・
・出力回路、5a・・・・・・出力回路、5b・・・・
・・出力回路、5c・・・・・・出力回路、5d・・・
・・−出力回路、ii・・・・・・元信号、12・・・
・・・電気信号、13・旧・・電気信号、14・旧・・
電気信号、14a・・・・・・電気信号、14b・・・
・・・電気信号、14C・・・・・・電気信号、14d
・・・・・・電気信号、15・・・・・・外部出力、1
5a・・・・・・外部出力、15b・・・・・・外部出
力、isc・・・・・・外部出力、15d・・・・・・
外部出力。FIG. 1 is a block diagram of a transmission type photoelectric sensor showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional transmission type photoelectric sensor. l...Light emitter, 2...Light receiver, 3...
...Amplification section, 4...Level discrimination fB, 4
a...Level a discrimination section, 4b...Level b 44JM section, 4c...Level C44J
Printing section, 4d...Level d discrimination section, 5...
・Output circuit, 5a... Output circuit, 5b...
...Output circuit, 5c...Output circuit, 5d...
...-output circuit, ii...original signal, 12...
...electrical signal, 13.old...electrical signal, 14.old...
Electrical signal, 14a... Electrical signal, 14b...
...Electric signal, 14C...Electric signal, 14d
...Electrical signal, 15...External output, 1
5a...External output, 15b...External output, isc...External output, 15d...
External output.
Claims (1)
る受光部と、受光部で光電変換された信号を増幅する増
幅部と、増幅部で増幅された信号を複数の検出レベルで
判定し、その結果をその検出レベルに対応した出力回路
に2値化して出力するレベル判別部と、レベル判別部か
らの各検出レベルごとに対応した2値化信号を外部に出
力する出力回路部とを含むことを特徴とする透過形光電
センサー。A light emitting section that emits light, a light receiving section that converts the received light into an electrical signal, an amplifying section that amplifies the signal photoelectrically converted in the light receiving section, and a signal amplified by the amplifying section that is sent to multiple detection levels. a level discriminator that makes a binary judgment and outputs the result to an output circuit corresponding to the detection level, and an output circuit that outputs to the outside a binary signal corresponding to each detection level from the level discriminator. A transmission type photoelectric sensor comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60062421A JPS61219886A (en) | 1985-03-27 | 1985-03-27 | Transmission type photoelectric sensor having plural detection levels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60062421A JPS61219886A (en) | 1985-03-27 | 1985-03-27 | Transmission type photoelectric sensor having plural detection levels |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61219886A true JPS61219886A (en) | 1986-09-30 |
Family
ID=13199671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60062421A Pending JPS61219886A (en) | 1985-03-27 | 1985-03-27 | Transmission type photoelectric sensor having plural detection levels |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61219886A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2690757A1 (en) * | 1992-05-04 | 1993-11-05 | Alsthom Gec | Monitoring system for position of electrical switch part - has U=shaped frame around part, optical fibre for directing modulated beam from one arm of frame to mirror on other arm for reflection back to fibre for detection, and comparator circuit. |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5850487A (en) * | 1981-09-21 | 1983-03-24 | Brother Ind Ltd | Detecting device for substance to be detected |
JPS5938677A (en) * | 1982-08-27 | 1984-03-02 | Ricoh Co Ltd | Detection apparatus |
-
1985
- 1985-03-27 JP JP60062421A patent/JPS61219886A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5850487A (en) * | 1981-09-21 | 1983-03-24 | Brother Ind Ltd | Detecting device for substance to be detected |
JPS5938677A (en) * | 1982-08-27 | 1984-03-02 | Ricoh Co Ltd | Detection apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2690757A1 (en) * | 1992-05-04 | 1993-11-05 | Alsthom Gec | Monitoring system for position of electrical switch part - has U=shaped frame around part, optical fibre for directing modulated beam from one arm of frame to mirror on other arm for reflection back to fibre for detection, and comparator circuit. |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1221435A (en) | Object detecting apparatus including photosensors for restricted detection area | |
US4737649A (en) | Sheet discriminating apparatus with hole-detecting means | |
JPH0244385B2 (en) | ||
JP3986162B2 (en) | Multi-optical axis photoelectric switch capable of detecting multiple projections | |
US4633077A (en) | Photoelectric switch with limit setting means to prevent disablement when the amplifier is saturated | |
US4199755A (en) | Optical smoke detector | |
US5404008A (en) | Control system for detecting intrusion of a light curtain | |
JPS61219886A (en) | Transmission type photoelectric sensor having plural detection levels | |
US20080087798A1 (en) | Optoelectronic security system | |
CA1322670C (en) | Photoelectric detector | |
US20080123084A1 (en) | Optoelectronic sensor | |
JPS61219883A (en) | Reflective type photoelectric sensor having plural detection levels | |
US20010020685A1 (en) | Detector and method for detecting plate-shaped or sheet-shaped body | |
US8576072B2 (en) | Optoelectronic sensor | |
JP3504017B2 (en) | Detection device | |
JPH06109432A (en) | Size measuring apparatus | |
US6437310B2 (en) | Threshold comparator | |
JPH0510425Y2 (en) | ||
JP7479822B2 (en) | Fire alarm systems, contact detectors and adapters | |
JP2515136B2 (en) | Reflective photoelectric detector | |
KR101090271B1 (en) | Apparatus for detecting line position using optical detecting device | |
KR950007187B1 (en) | Address control device of unmanned moving body | |
JPH0340539A (en) | Device for detecting disconnection of optical signal input | |
JPH0370280B2 (en) | ||
JPH02176485A (en) | Ultrasonic sensor |