JP2906426B2 - Photoelectric switch - Google Patents
Photoelectric switchInfo
- Publication number
- JP2906426B2 JP2906426B2 JP6120889A JP6120889A JP2906426B2 JP 2906426 B2 JP2906426 B2 JP 2906426B2 JP 6120889 A JP6120889 A JP 6120889A JP 6120889 A JP6120889 A JP 6120889A JP 2906426 B2 JP2906426 B2 JP 2906426B2
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- Prior art keywords
- light receiving
- light
- photoelectric switch
- signal
- sensitivity
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Description
【発明の詳細な説明】 （イ）発明の属する技術分野 この発明は、投光手段と受光手段を備えた光電スイッ
チに関し、さらに詳しくは、検出物体の検出感度を自動
調整する機能を備えた光電スイッチに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric switch having a light projecting unit and a light receiving unit, and more particularly, to a photoelectric switch having a function of automatically adjusting the detection sensitivity of a detection object. About the switch.
（ロ）従来の技術 通常の光電スイッチは第７図に示すように、発振器41
の出力を用いた点滅タイミングで投光手段42から目的方
向に投光し、検出物体（図示せず）の反射光を受光手段
43で受光して、その受光信号を増幅器44、比較器45、同
期回路46、ラッチ回路47、積分回路48を通し、出力回路
49で物体検出信号を出力するように構成されている。(B) Conventional technology A normal photoelectric switch is composed of an oscillator 41 as shown in FIG.
The light is emitted from the light projecting means 42 in the target direction at the blinking timing using the output of the object, and the reflected light of the detection object (not shown) is received by the light receiving means
The light received by 43 is passed through an amplifier 44, a comparator 45, a synchronizing circuit 46, a latch circuit 47, and an integrating circuit 48, and an output circuit
At 49, an object detection signal is output.
ところで、光電スイッチの受光感度の調整は、従来に
おいては感度調整ボリューム50によって行なわれた。By the way, the adjustment of the light receiving sensitivity of the photoelectric switch is conventionally performed by the sensitivity adjusting volume 50.
すなわち、反射型の光電スイッチでは、背景物体（図
示せず）からの反射光による誤動作を防ぐため、まず検
出物体を検出位置に置き、この検出物体を検知し得る最
小受光感度をボリューム50を回しながら求め、この時の
ボリューム50の回転角を記録する。このボリューム回転
位置を位置Ａとする。次に検出物体を取り除き、背景物
体を検知する最小受光感度（これは検出物体を検知する
場合の最大受光感度に対応している）をボリューム50を
回して求め、この時のボリューム50の回転角を記録す
る。このボリューム回転位置を位置Ｂとする。That is, in the reflection-type photoelectric switch, the detection object is first placed at the detection position and the volume 50 is set to the minimum light-receiving sensitivity at which the detection object can be detected in order to prevent malfunction due to light reflected from a background object (not shown). The rotation angle of the volume 50 at this time is recorded. This volume rotation position is defined as position A. Next, the detected object is removed, and the minimum light receiving sensitivity for detecting the background object (this corresponds to the maximum light receiving sensitivity when detecting the detected object) is obtained by rotating the volume 50, and the rotation angle of the volume 50 at this time is obtained. Record This volume rotation position is defined as position B.
そしてボリューム50を、最も安定な検出が可能な位置
Ａと位置Ｂの中間位置にセットする。Then, the volume 50 is set at an intermediate position between the positions A and B where the most stable detection is possible.
しかしながら、上述の説明からも明らかなように、従
来の光電スイッチ受光感度調整操作は手動によるボリュ
ーム操作に頼るため、煩雑で時間がかかり、また調整操
作に相当の熟練を必要とする欠点があった。However, as is clear from the above description, the conventional operation of adjusting the light receiving sensitivity of the photoelectric switch depends on manual volume operation, which is troublesome and time-consuming, and has the drawback that the adjustment operation requires considerable skill. .
（ハ）発明が解決しようとする課題 この発明は、検出物体を検知し得る最小と最大の受光
信号の大きさを自動的にサンプルホールドして記憶し、
その中間に検出感度を自動設定することができ、さら
に、外部装置（例えばシーケンサ）から記憶タイミング
指示用の入力信号が入力されることで、受光感度のサン
プルホールドおよび記録を自動的に実行することができ
る光電スイッチの提供を目的とする。(C) Problems to be Solved by the Invention According to the present invention, the magnitudes of the minimum and maximum light receiving signals capable of detecting a detected object are automatically sampled and held and stored.
The detection sensitivity can be automatically set in the middle, and further, when an input signal for instructing storage timing is input from an external device (for example, a sequencer), the sample hold and recording of the light reception sensitivity are automatically executed. The purpose of the present invention is to provide a photoelectric switch capable of performing the following.
（ニ）課題を解決するための手段 この発明は、投光手段と、検出物体からの反射光を受
光する受光手段とを備えると共に、検出物体を検知し得
る最小受光感度設定状態での受光信号の大きさをサンプ
ルホールドして記憶する手段と、検出物体を検知し得る
最大感度設定状態での受光信号の大きさをサンプルホー
ルドして記憶する手段と、両受光感度の受光信号の大き
さの間に光電スイッチ受光感度を設定する演算手段と、
最小受光感度設定状態および最大受光感度設定状態で、
それぞれの受光信号の大きさの記憶実行を指示する外部
装置からの入力信号を受信する手段とを設けた光電スイ
ッチであることを特徴とする。(D) Means for Solving the Problems The present invention comprises a light projecting means and a light receiving means for receiving reflected light from a detected object, and a light receiving signal in a minimum light receiving sensitivity setting state capable of detecting the detected object. Means for sample-holding and storing the magnitude of the light-receiving signal, means for sample-holding and storing the magnitude of the received light signal in the maximum sensitivity setting state capable of detecting the detected object, and means for storing the magnitude of the received light signal of both light-receiving sensitivities. Calculating means for setting the photoelectric switch light receiving sensitivity in between,
In the minimum and maximum sensitivity settings,
And a means for receiving an input signal from an external device for instructing execution of storage of the magnitude of each light receiving signal.
（ホ）発明の作用及び効果 この発明によれば、背景物体の前に検知物体を置いた
状態で、その検知物体を検知し得る最小の受光感度を記
憶し、次に検出物体を取り除き、背景物体を検知し得る
最小の受光感度（換言すれば、検知物体を検知し得る最
大の受光感度）を記憶することによって、演算手段が自
動的に両記憶内容の平均を演算して、光電スイッチ受光
感度を設定する。(E) Function and Effect of the Invention According to the present invention, with a detection object placed in front of a background object, the minimum light receiving sensitivity capable of detecting the detection object is stored, and then the detection object is removed, and the background is removed. By storing the minimum light receiving sensitivity at which an object can be detected (in other words, the maximum light receiving sensitivity at which a detected object can be detected), the calculation means automatically calculates the average of the two stored contents, and receives the photoelectric switch light reception. Set the sensitivity.
従って、光電スイッチ受光感度の調整は自動化により
大幅に簡略化され、誰人にでも簡単に操作できるものに
なる。Therefore, the adjustment of the light receiving sensitivity of the photoelectric switch is greatly simplified by automation, and can be easily operated by anyone.
さらに、受光感度のサンプルホールドと記憶とは、シ
ーケンサ等の外部装置から記憶タイミング指示用の信号
が入力されることで自動的に実行されるので、スイッチ
手段の人為的な操作も必要なくなって、検出物体の変化
による再調整も自動的に実行できる。Further, since the sample hold and storage of the light receiving sensitivity are automatically executed when a signal for indicating storage timing is input from an external device such as a sequencer, no manual operation of the switch means is required. Re-adjustment due to a change in the detected object can also be automatically performed.
（ヘ）実施例 この発明の一実施例を以下図面に基づいて詳述する。(F) Embodiment One embodiment of the present invention will be described in detail below with reference to the drawings.
第１図は本発明に係る光電スイッチのブロック回路
図、第２図は光電スイッチの斜視図、第３図（イ）
（ロ）は光電スイッチ受光感度調整時の説明図、第４図
は同じく光電スイッチ受光感度調整時の信号波形図であ
る。FIG. 1 is a block circuit diagram of a photoelectric switch according to the present invention, FIG. 2 is a perspective view of the photoelectric switch, and FIG.
(B) is an explanatory diagram when adjusting the light receiving sensitivity of the photoelectric switch, and FIG. 4 is a signal waveform diagram when adjusting the light receiving sensitivity of the photoelectric switch.
光電スイッチ10は、発振器１の出力を用いた点滅タイ
ミングで投光手段２から目的方向に投光し、検出物体の
反射光を受光手段３で受光し、その受光信号を増幅器
４、比較器５、同期回路６、ラッチ回路７、積分回路８
に通し、出力回路９で検出信号として取出すもので、こ
れらの回路部分は従来と同様である。The photoelectric switch 10 emits light from the light projecting means 2 in the target direction at the blinking timing using the output of the oscillator 1, receives the reflected light of the detected object by the light receiving means 3, and amplifies the received light signal by the amplifier 4 and the comparator 5. , Synchronization circuit 6, latch circuit 7, integration circuit 8
And output it as a detection signal at the output circuit 9. These circuit parts are the same as in the prior art.
この発明では、受光信号の大きさを発振器１の出力を
タイミング信号に用いて、かつ増幅器４の後段からサン
プルホールドするサンプルホールド回路11が設けられ
る。According to the present invention, a sample-and-hold circuit 11 is provided which uses the output of the oscillator 1 as a timing signal for the magnitude of the light-receiving signal and samples and holds the signal from the subsequent stage of the amplifier 4.
このサンプルホールド回路11は光電スイッチ受光感度
調整用であって、該サンプルホールド回路11の出力はA/
D変換回路12を通し２つの記憶手段13,14の何れかに送ら
れて記憶される。This sample and hold circuit 11 is for adjusting the light receiving sensitivity of the photoelectric switch, and the output of the sample and hold circuit 11 is A / A
The data is sent to and stored in one of the two storage units 13 and 14 through the D conversion circuit 12.
記憶手段13,14を選択するのがティーチングスイッチ1
5,16で、一方のティーチングスイッチ15をONするに伴い
トリガ回路17によって一方の記憶手段13が選択されて、
これにサンプルホールド回路11の出力が記憶される。The teaching switch 1 is used to select the storage means 13 and 14.
At 5, 16, one of the storage means 13 is selected by the trigger circuit 17 as one of the teaching switches 15 is turned on.
The output of the sample and hold circuit 11 is stored in this.
また、他方のティーチングスイッチ16をONするとトリ
ガ回路18によって他方の記憶手段14が選択されて、これ
にサンプルホールド回路11の出力が記憶される。Further, when the other teaching switch 16 is turned on, the other storage means 14 is selected by the trigger circuit 18 and the output of the sample hold circuit 11 is stored therein.
なお、記憶手段13,14としてはEE−PROM、あるいはバ
ッテリまたは大容量コンデンサにより電源をバックアッ
プされたRAMが用いられる。Note that, as the storage units 13 and 14, an EE-PROM or a RAM whose power is backed up by a battery or a large-capacity capacitor is used.
演算回路19は上記両記憶手段13,14に記憶された受光
信号の大きさを演算し、両受光信号の大きさの間に光電
スイッチ10の受光感度を設定し、これをD/A変換回路20
を通し、比較器５のリファレンスレベルを変化させる。The arithmetic circuit 19 calculates the magnitude of the light receiving signal stored in the storage means 13 and 14, sets the light receiving sensitivity of the photoelectric switch 10 between the magnitudes of the light receiving signals, and sets this to the D / A conversion circuit. 20
, The reference level of the comparator 5 is changed.
光電スイッチ10は第２図のようにケース21に囲繞され
ており、ケース21の外面に前述の一対のティーチングス
イッチ15,16が露呈されている。これらのティーチング
スイッチ15,16は光電スイッチ受光感度調整後は用済み
となるので、保護カバー22をケース２に取り付けて、両
スイッチ15,16を覆う。保護カバー22とケース21とは両
者の凸部23と凹部24の嵌合によって固定される。The photoelectric switch 10 is surrounded by a case 21 as shown in FIG. 2, and the pair of teaching switches 15 and 16 are exposed on the outer surface of the case 21. Since these teaching switches 15 and 16 become used after adjusting the light receiving sensitivity of the photoelectric switch, the protective cover 22 is attached to the case 2 to cover both switches 15 and 16. The protective cover 22 and the case 21 are fixed by fitting the projection 23 and the recess 24 of both.
次に光電スイッチ受光感度設定方法について説明す
る。Next, a method of setting the light receiving sensitivity of the photoelectric switch will be described.
まず、第３図の（イ）のように、背景物体25の前に検
出物体26を位置させ、検出物体26を検知し得る最小受光
感度設定状態にする。First, as shown in FIG. 3A, the detection object 26 is positioned in front of the background object 25, and the minimum light receiving sensitivity setting state in which the detection object 26 can be detected is set.
投光手段２からは第４図の（イ）に示す点滅光が検出
物体26に投射され、その反射光が受光手段３に入力す
る。この受光信号波形が第４図（ロ）における波形Ａ
（受光信号）であって、この受光信号Ａのピーク値VAが
サンプルホールドされ、一方のティーチングスイッチ15
をONさせるに伴いA/D変換されたピーク値VAが、最小受
光感度設定状態の受光信号の大きさとして一方の記憶手
段13に記憶される（第１の工程）。The flashing light shown in FIG. 4A is projected onto the detection object 26 from the light projecting means 2, and the reflected light is input to the light receiving means 3. This light receiving signal waveform is the waveform A in FIG.
(Light receiving signal), and the peak value VA of the light receiving signal A is sampled and held.
Is turned on, the A / D converted peak value VA is stored in one storage means 13 as the magnitude of the light receiving signal in the minimum light receiving sensitivity setting state (first step).
次に第３図の（ロ）のように背景物体25の前から検出
物体26を取り除いて背景物体25を検出する最小感度設定
状態、つまり検出物体26を検知し得る最大受光感度設定
状態とし、同様にして背景物体25からの反射光を受光す
る。この時の受光信号波形が第４図の（ロ）における波
形Ｂ（受光信号）であって、この受光信号Ｂのピーク値
VBがサンプルホールドされ、他方のティーチングスイッ
チ16をONさせるに伴いA/D変換されたピーク値VBが、最
大受光感度設定状態の受光信号の大きさとして他方の記
憶手段14に記憶される（第２の工程）。Next, as shown in (b) of FIG. 3, the detection object 26 is removed from the front of the background object 25 to set the minimum sensitivity setting state for detecting the background object 25, that is, the maximum light reception sensitivity setting state for detecting the detection object 26. Similarly, the reflected light from the background object 25 is received. The light receiving signal waveform at this time is the waveform B (light receiving signal) in (b) of FIG.
VB is sampled and held, and the A / D converted peak value VB is stored in the other storage means 14 as the magnitude of the light receiving signal in the maximum light receiving sensitivity setting state when the other teaching switch 16 is turned on (see FIG. Step 2).
演算回路19は上記第１および第２の両工程によって両
記憶手段13,14に記憶された双方の受光信号VA,VBの大き
さを取り出し、信号VAと信号VBを演算して両者の中間レ
ベルの電圧Ｃに光電スイッチ受光感度を設定し、これで
比較器５のリファレンスレベルを調整する。The arithmetic circuit 19 takes out the magnitudes of the light receiving signals VA and VB stored in the two storage means 13 and 14 by the first and second steps, calculates the signals VA and VB, and calculates the intermediate level between the two. The light receiving sensitivity of the photoelectric switch is set to the voltage C, and the reference level of the comparator 5 is adjusted by this.
従って、以上の光電スイッチ受光感度調整後では、受
光手段３に入力して幅器４で増幅された受光信号の大き
さが、比較器５でリファレンスレベルと比較され、受光
信号の大きさがこのレベルを超える時に、検出物体26の
検出信号が出力手段９から出力される。Therefore, after the above-described adjustment of the light receiving sensitivity of the photoelectric switch, the magnitude of the light receiving signal input to the light receiving means 3 and amplified by the width unit 4 is compared with the reference level by the comparator 5, and the magnitude of the light receiving signal is When the level is exceeded, a detection signal of the detection object 26 is output from the output means 9.
第１図の回路構成は光電スイッチ受光感度を、比較器
５のリファレンスレベルで調整したが、第５図のように
増幅器４の増幅ゲイン調整で行なうようにしてもよく、
この場合は、光電スイッチ受光感度調整時、サンプルホ
ールドする受光信号の大きさが増幅器４の前段から取り
出される回路構成となる。Although the circuit configuration of FIG. 1 adjusts the light receiving sensitivity of the photoelectric switch by the reference level of the comparator 5, it may be adjusted by adjusting the amplification gain of the amplifier 4 as shown in FIG.
In this case, at the time of adjusting the light receiving sensitivity of the photoelectric switch, the magnitude of the light receiving signal to be sampled and held is taken out of the stage preceding the amplifier 4.
前記したティーチングスイッチ15,16はそれぞれに対
応する記憶手段13,14に記憶タイミングを指示するため
のものであるが、これはシーケンサのような外部装置か
ら記憶タイミング指示信号を与えることができる。すな
わち、光電スイッチ10が検知すべき検出物体26が変えら
れた場合、多くは反射背景（背景物の条件）も異なるの
で、光電スイッチ受光感度を再調整せねばならなくな
る。そこで外部装置によって検出物体26が変わったこと
を入力して、自動的に感度調整動作を実行させるのであ
る。The teaching switches 15 and 16 are for instructing storage means 13 and 14 corresponding to the storage switches 13 and 14, respectively, and can provide a storage timing indication signal from an external device such as a sequencer. That is, when the detection object 26 to be detected by the photoelectric switch 10 is changed, the reflection background (condition of the background object) is also different in many cases, so that the light receiving sensitivity of the photoelectric switch must be readjusted. Therefore, the fact that the detection object 26 has been changed by the external device is input, and the sensitivity adjustment operation is automatically executed.
第６図はそのための回路であって、シーケンサにタイ
ミング信号入力端子27,28が接続され、検出物体26が変
わると、シーケンサからこれらタイミング入力端子27,2
8に記憶タイミング指示信号（記憶タイミング指示用の
入力信号）が入力される。これら信号はフィルタ29,30
を通ってトランジスタ31,32を通電させ、トリガ回路17,
18によって第１図の回路動作と同様それぞれに接続され
た記憶手段13,14を作動させる。FIG. 6 shows a circuit for this purpose. When the timing signal input terminals 27 and 28 are connected to the sequencer and the detection object 26 changes, the sequencer outputs these timing input terminals 27 and 2 to the sequencer.
A storage timing instruction signal (input signal for storage timing instruction) is input to 8. These signals are filtered by filters 29 and 30
Through the transistors 31, 32, and the trigger circuit 17,
The storage means 13 and 14 connected respectively are operated by 18 in the same manner as the circuit operation of FIG.
以上のように本発明の光電スイッチによれば、検出物
体を検知し得る最小受光感度の記憶動作と、検出物体を
検知し得る最大受光感度（背景物体を検知する最小感
度）の記憶動作と、両記憶感度からの光電スイッチ受光
感度設定動作がティーチングスイッチ15,16をONさせる
操作だけで自動的に行なえる。As described above, according to the photoelectric switch of the present invention, the storing operation of the minimum light receiving sensitivity capable of detecting the detected object, the storing operation of the maximum light receiving sensitivity capable of detecting the detected object (the minimum sensitivity detecting the background object), The photoelectric switch light receiving sensitivity setting operation from both memory sensitivities can be automatically performed only by turning on the teaching switches 15 and 16.
また、第６図のように、ティーチングスイッチ15,16
に代えてシーケンサから記憶タイミング指示信号（記憶
タイミング指示用の入力信号）を入力させることによっ
て、検出物体が変わっても人手を煩わすことなく、光電
スイッチ受光感度の再調整が自動的に行なえる。Also, as shown in FIG.
Instead, by inputting a storage timing instruction signal (input signal for storage timing instruction) from the sequencer, readjustment of the light receiving sensitivity of the photoelectric switch can be automatically performed without any trouble even if the detected object changes.
この発明の構成と、上述の実施例との対応において、 この発明の光電スイッチは、実施例の光電スイッチ10
に対応し、 以下同様に、 投光手段は、投光手段２に対応し、 受光手段は、受光手段３に対応し、 サンプルホールドする回路は、サンプルホールド回路
11に対応し、 記憶手段は、記憶手段13,14に対応し、 演算手段は、演算手段19に対応し、 検出物体は、検出物体26に対応し、 外部装置からの入力信号の受信手段は、タイミング信
号入力端子27,28およびトランジスタ31,32に対応する
も、 この発明は上述の実施例の構成のみに限定されるもの
ではない。In correspondence between the configuration of the present invention and the above embodiment, the photoelectric switch of the present invention
Similarly, the light emitting means corresponds to the light emitting means 2, the light receiving means corresponds to the light receiving means 3, and the circuit for sampling and holding is a sample and hold circuit.
11, the storage means corresponds to the storage means 13, 14, the arithmetic means corresponds to the arithmetic means 19, the detected object corresponds to the detected object 26, and the receiving means of the input signal from the external device is Although the present invention corresponds to the timing signal input terminals 27 and 28 and the transistors 31 and 32, the present invention is not limited to the configuration of the above-described embodiment.
第１図は本発明の光電スイッチを示すブロック回路図、 第２図は光電スイッチの外観斜視図、 第３図イ，ロはスイッチ感度手順の説明図、 第４図は投光・受光信号波形図、 第５図は変形例を示すブロック回路図、 第６図は本発明の光電スイッチの第２実施例を示すブロ
ック回路図、 第７図は従来の光電スイッチを示すブロック回路図であ
る。 ２……投光手段、３……受光手段 ４……増幅器、５……比較器 ９……出力回路、10……光電スイッチ 11……サンプルホールド回路、13,14……記憶手段 15,16……ティーチングスイッチ 19……演算手段、25……背景物体 26……検出物体、27,28……タイミング信号入力端子 31,32……トランジスタ1 is a block circuit diagram showing a photoelectric switch of the present invention, FIG. 2 is an external perspective view of the photoelectric switch, FIGS. 3A and 3B are explanatory diagrams of a switch sensitivity procedure, and FIG. 4 is a light emitting / receiving signal waveform. FIG. 5, FIG. 5 is a block circuit diagram showing a modification, FIG. 6 is a block circuit diagram showing a second embodiment of the photoelectric switch of the present invention, and FIG. 7 is a block circuit diagram showing a conventional photoelectric switch. 2 Projecting means 3 Light receiving means 4 Amplifier 5 Comparator 9 Output circuit 10 Photoelectric switch 11 Sample hold circuit 13, 14 Storage means 15, 16 ... Teaching switch 19 ... Calculation means, 25 ... Background object 26 ... Detection object, 27, 28 ... Timing signal input terminal 31, 32 ... Transistor
Claims (1)
する受光手段とを備えると共に、検出物体を検知し得る
最小受光感度設定状態での受光信号の大きさをサンプル
ホールドして記憶する手段と、検出物体を検知し得る最
大感度設定状態での受光信号の大きさをサンプルホール
ドして記憶する手段と、両受光感度の受光信号の大きさ
の間に光電スイッチ受光感度を設定する演算手段と、 最小受光感度設定状態および最大受光感度設定状態で、
それぞれの受光信号の大きさの記憶実行を指示する外部
装置からの入力信号を受信する手段とを設けた 光電スイッチ。A light receiving means for receiving reflected light from a detection object; sample-holding and storing a magnitude of a light reception signal in a minimum light receiving sensitivity setting state capable of detecting the detection object; Means for sampling, holding and storing the magnitude of the light receiving signal in the maximum sensitivity setting state capable of detecting the detection object, and setting the photoelectric switch light receiving sensitivity between the light receiving signal magnitudes of the two light receiving sensitivities. In the calculation means, the minimum light sensitivity setting state and the maximum light sensitivity setting state,
Means for receiving an input signal from an external device for instructing execution of storage of the magnitude of each light receiving signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6120889A JP2906426B2 (en) | 1989-03-13 | 1989-03-13 | Photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6120889A JP2906426B2 (en) | 1989-03-13 | 1989-03-13 | Photoelectric switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02239720A JPH02239720A (en) | 1990-09-21 |
| JP2906426B2 true JP2906426B2 (en) | 1999-06-21 |
Family
ID=13164543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6120889A Expired - Lifetime JP2906426B2 (en) | 1989-03-13 | 1989-03-13 | Photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2906426B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2558645Y2 (en) * | 1991-09-13 | 1997-12-24 | サンクス 株式会社 | Photoelectric switch |
| JP2515903Y2 (en) * | 1992-08-31 | 1996-11-06 | サンクス株式会社 | Detection switch device |
-
1989
- 1989-03-13 JP JP6120889A patent/JP2906426B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02239720A (en) | 1990-09-21 |
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