JPH031848B2 - - Google Patents
Info
- Publication number
- JPH031848B2 JPH031848B2 JP11894183A JP11894183A JPH031848B2 JP H031848 B2 JPH031848 B2 JP H031848B2 JP 11894183 A JP11894183 A JP 11894183A JP 11894183 A JP11894183 A JP 11894183A JP H031848 B2 JPH031848 B2 JP H031848B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- flip
- light
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 20
- 230000000737 periodic effect Effects 0.000 claims description 10
- 230000007257 malfunction Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/968—Switches controlled by moving an element forming part of the switch using opto-electronic devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
Landscapes
- Electronic Switches (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、光電スイツチに関するものである。[Detailed description of the invention] 〔Technical field〕 The present invention relates to a photoelectric switch.
従来、投光手段から投光されるパルス光が被検
知物体によつて反射あるいは遮蔽されたことを受
光検知手段で検出して物体検知信号を出力するよ
うにしたこの種の光電スイツチにおいて、電源投
入後しばらくの間誤動作する恐れがあつた。例え
ば遮光時に物体検知信号が出力されるようにした
場合において、電源投入直後（1.0ms）に受光信
号の増幅回路が正常に動作しないために、被検知
物体によつて遮光されていないにも拘らず増巾回
路出力が得られず、誤つた物体検知信号が出力さ
れてしまうという問題があつた。
Conventionally, in this type of photoelectric switch, in which the light receiving detection means detects that the pulsed light emitted from the light emitting means is reflected or blocked by the object to be detected, and outputs an object detection signal, the power supply There was a risk that it would malfunction for a while after it was turned on. For example, when an object detection signal is output when light is blocked, the amplification circuit for the light reception signal does not operate properly immediately after power is turned on (1.0ms), so even though the light is not blocked by the object to be detected, However, there was a problem in that the amplification circuit output could not be obtained and an erroneous object detection signal would be output.
本発明は上記の点に鑑みて為されたものであ
り、電源投入直後の誤動作を確実に防止すること
ができる光電スイツチを提供することを目的とす
るものである。
The present invention has been made in view of the above points, and it is an object of the present invention to provide a photoelectric switch that can reliably prevent malfunctions immediately after power is turned on.
（実施例）
添付図は本発明一実施例を示すもので、１は発
振回路（OSC）と、カウンタ回路（CT）と、ア
ンド回路（AND）とよりなる周期パルス発生回
路、２は発光ダイオード、レーザダイオードなど
を用いて形成される投光手段であり、投光手段２
は周期パルスVCKに同期してパルス光Ｐを検知エ
リアに向つて投光する。３は受光検知手段であ
り、この受光検知手段３は投光手段２から投光さ
れるパルス光Ｐの被検知物体Ｘによる反射光Ｒを
受光して受光信号に変換するホトダイオード、ホ
トトランジスタなどよりなる受光素子と、受光信
号を増巾する増巾回路と、増巾された受光信号レ
ベルを周期パルスに同期して判別することにより
被検知物体の有無を示す物体検知信号を出力する
比較回路とで構成されている。４はクロツク端子
（CL）に印加される周期パルスVCKを計数して所
定値になつたとき出力端子（OUT）からカウン
トアツプ信号V0を出力する。５はカウンタ回路
４から出力されるカウントアツプ信号V0にてセ
ツトされるＲ−Ｓフリツプフロツプ回路であり、
このＲ−Ｓフリツプフロツプ回路５出力Ｑが″
H″レベルにセツトされたとき物体検知信号VXが
アンド回路よりなるゲート回路６を介して出力回
路７に送られるようになつている。９はコンパレ
ータ（CP1），（CP2）と、オア回路（OR）と、基
準電源（ES）と、抵抗（R1）と、コンデンサ
（C1）とよりなるリセツト回路であり、電源投入
時すなわち定電圧電源８の立上り時にコンパレー
タ（CP2）出力が″H″レベルとなつてカウンタ回
路４およびＲ−Ｓフリツプフロツプ回路５がリセ
ツトされるようになつており、電源投入時から一
定時間（カウンタ回路４にて周期パルスVCKを所
定個数カウントする間）だけフリツプフロツプ回
路５の出力Ｑが″L″レベルとなつて物体検知信号
VXの出力をゲート回路６にて阻止するようにな
つている。なお、コンパレータCP1は出力回路７
に流れる過電流を抵抗R1によつて検出し、電源
端子（TV）、出力端子（T0）、共通端子（TC）へ
の誤配線によつて出力回路７に過電流が流れたと
き、Ｒ−Ｓフリツプフロツプ回路５をリセツトす
るためのものであり、出力回路７に過電流が流れ
たとき物体検知信号VXの出力を停止して出力回
路７のトランジスタなどの破壊を防止するように
なつている。
(Embodiment) The attached diagram shows an embodiment of the present invention, in which 1 shows a periodic pulse generation circuit consisting of an oscillation circuit (OSC), a counter circuit (CT), and an AND circuit (AND), and 2 shows a light emitting diode. , a light projecting means formed using a laser diode or the like, and the light projecting means 2
emits pulsed light P toward the detection area in synchronization with the periodic pulse VCK . Reference numeral 3 denotes a light reception detection means, and the light reception detection means 3 is composed of a photodiode, a phototransistor, etc., which receives the reflected light R of the pulsed light P projected from the light projection means 2 by the object to be detected X and converts it into a light reception signal. a light receiving element, an amplifying circuit that amplifies the received light signal, and a comparison circuit that outputs an object detection signal indicating the presence or absence of a detected object by determining the level of the amplified received light signal in synchronization with a periodic pulse. It consists of 4 counts the periodic pulses VCK applied to the clock terminal (CL) and outputs a count-up signal V0 from the output terminal (OUT) when the periodic pulses VCK are counted to a predetermined value. 5 is an R-S flip-flop circuit that is set by the count-up signal V0 output from the counter circuit 4;
This R-S flip-flop circuit 5 output Q is
When set to H'' level, the object detection signal V This is a reset circuit consisting of an OR circuit (OR), a reference power supply (E S ), a resistor (R 1 ), and a capacitor (C 1 ) . ) The output goes to "H" level and the counter circuit 4 and R-S flip-flop circuit 5 are reset, and the counter circuit 4 counts a predetermined number of periodic pulses V CK for a certain period of time from the time the power is turned on. During this time, the output Q of the flip-flop circuit 5 becomes “L” level and the object detection signal is generated.
The output of VX is blocked by a gate circuit 6. Note that comparator CP 1 is connected to output circuit 7.
Resistor R1 detects an overcurrent flowing through the output circuit 7 due to incorrect wiring to the power supply terminal (T V ), output terminal (T 0 ), and common terminal (T C ). This is for resetting the R-S flip-flop circuit 5 when an overcurrent flows through the output circuit 7, and stops outputting the object detection signal VX to prevent damage to the transistors, etc. of the output circuit 7. It's getting old.
本発明は上述のように、所定の周期パルスにて
投光が制御される投光手段と、投光手段から投光
されるパルス光の被検知物体による反射あるいは
遮蔽を検出して物体検知信号を出力する受光検知
手段とよりなる光電スイツチにおいて、周期パル
スを計数するカウンタ回路と、カウンタ回路出力
が所定値になつたときセツトされるＲ−Ｓフリツ
プフロツプ回路と、Ｒ−Ｓフリツプフロツプ回路
がセツトされたとき物体検知信号を通過させるゲ
ート回路と、電源投入時にカウンタ回路およびＲ
−Ｓフリツプフロツプ回路をリセツトするリセツ
ト回路とを設け、電源投入後一定時間だけ物体検
知信号を出力させないようにしたものであり、電
源投入直後の過渡現象による誤動作を確実に防止
することができ、また、カウンタ回路の計数値を
変更することにより、物体検知信号を出力させな
い期間を任意に設定でき、受光検知手段の回路特
性に容易に対応させることができるという効果が
ある。
As described above, the present invention includes a light projection means whose light projection is controlled by a predetermined periodic pulse, and an object detection signal by detecting the reflection or shielding of the pulsed light projected from the light projection means by an object to be detected. In the photoelectric switch, the photoelectric switch is composed of a light receiving detection means that outputs a periodic pulse. A gate circuit that passes the object detection signal when the power is turned on, and a counter circuit and R
- A reset circuit is provided to reset the S flip-flop circuit, and the object detection signal is not output for a certain period of time after the power is turned on. This makes it possible to reliably prevent malfunctions due to transient phenomena immediately after the power is turned on. By changing the count value of the counter circuit, the period during which the object detection signal is not output can be arbitrarily set, which has the advantage that it can be easily adapted to the circuit characteristics of the light reception detection means.
添付図は本発明一実施例の回路図であり、２は
投光手段、３は受光検知手段、４はカウンタ回
路、５はＲ−Ｓフリツプフロツプ回路、６はゲー
ト回路、９はリセツト回路である。
The attached figure is a circuit diagram of one embodiment of the present invention, in which 2 is a light projecting means, 3 is a light reception detecting means, 4 is a counter circuit, 5 is an R-S flip-flop circuit, 6 is a gate circuit, and 9 is a reset circuit. .
Claims (1)
手段と、投光手段から投光されるパルス光の被検
知物体による反射あるいは遮蔽を検出して物体検
知信号を出力する受光検知手段とよりなる光電ス
イツチにおいて、周期パルスを計数するカウンタ
回路と、カウンタ回路出力が所定値になつたとき
セツトされるＲ−Ｓフリツプフロツプ回路と、Ｒ
−Ｓフリツプフロツプ回路がセツトされたとき物
体検知信号を通過させるゲート回路と、電源投入
時にカウンタ回路およびＲ−Ｓフリツプフロツプ
回路をリセツトするリセツト回路とを設け、電源
投入後一定時間だけ物体検知信号を出力させない
ようにして成る光電スイツチ。1. A light projecting means whose light projection is controlled by a predetermined periodic pulse, and a light receiving detecting means which detects reflection or shielding of the pulsed light emitted from the light projecting means by a detected object and outputs an object detection signal. A photoelectric switch includes a counter circuit that counts periodic pulses, an R-S flip-flop circuit that is set when the output of the counter circuit reaches a predetermined value, and an R-S flip-flop circuit that is set when the output of the counter circuit reaches a predetermined value.
A gate circuit that passes the object detection signal when the -S flip-flop circuit is set, and a reset circuit that resets the counter circuit and the R-S flip-flop circuit when the power is turned on are provided, and the object detection signal is output for a certain period of time after the power is turned on. A photoelectric switch that prevents
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11894183A JPS6010916A (en) | 1983-06-30 | 1983-06-30 | Photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11894183A JPS6010916A (en) | 1983-06-30 | 1983-06-30 | Photoelectric switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6010916A JPS6010916A (en) | 1985-01-21 |
| JPH031848B2 true JPH031848B2 (en) | 1991-01-11 |
Family
ID=14749018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11894183A Granted JPS6010916A (en) | 1983-06-30 | 1983-06-30 | Photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6010916A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61242417A (en) * | 1985-04-19 | 1986-10-28 | Sankusu Kk | Detection switch |
| JPS6441519A (en) * | 1987-08-07 | 1989-02-13 | Mitsubishi Electric Corp | Semiconductor integrated circuit |
| JP4725304B2 (en) * | 2005-11-25 | 2011-07-13 | 株式会社ケンウッド | Countersunk screw waterproof fastening structure |
-
1983
- 1983-06-30 JP JP11894183A patent/JPS6010916A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6010916A (en) | 1985-01-21 |
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