JP2671377B2 - Photoelectric switch - Google Patents
Photoelectric switchInfo
- Publication number
- JP2671377B2 JP2671377B2 JP63113059A JP11305988A JP2671377B2 JP 2671377 B2 JP2671377 B2 JP 2671377B2 JP 63113059 A JP63113059 A JP 63113059A JP 11305988 A JP11305988 A JP 11305988A JP 2671377 B2 JP2671377 B2 JP 2671377B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- output
- current
- waveform shaping
- 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 - Fee Related
Links
Landscapes
- Electronic Switches (AREA)
Description
【発明の詳細な説明】 〔発明の分野〕 本発明は低消費電力化を図るようにした光電スイッチ
に関するものである。Description: FIELD OF THE INVENTION The present invention relates to a photoelectric switch designed to reduce power consumption.
従来光電スイッチは、例えば第６図に示すようにクロ
ック信号を発生する発振回路１の出力によって投光素子
２をパルス点灯すると共に、投光素子２と対向する位置
又は物体からの反射光を受光する位置に受光素子３を設
け、その出力を増幅回路４によって増幅している。そし
て増幅出力を波形整形回路５によって波形整形し、発振
回路１の発振出力をゲート信号としてゲート回路６を介
して更にその出力を積分回路7,波形整形回路８を介して
出力回路９より出力するようにしていた。そして増幅回
路4,波形整形回路５等には夫々図示のように電流源10,1
1が供給されている。The conventional photoelectric switch, for example, as shown in FIG. 6, pulse-lights the light projecting element 2 by the output of the oscillation circuit 1 that generates a clock signal, and receives light reflected from a position facing the light projecting element 2 or an object. The light receiving element 3 is provided at the position where the light is turned on, and the output thereof is amplified by the amplifier circuit 4. Then, the amplified output is shaped by the waveform shaping circuit 5, and the oscillation output of the oscillating circuit 1 is used as a gate signal to output the output from the output circuit 9 via the gate circuit 6 and the integrating circuit 7 and the waveform shaping circuit 8. Was doing. The amplifier circuit 4, the waveform shaping circuit 5, etc. are respectively provided with current sources 10, 1 as shown in the figure.
1 is supplied.
〔発明が解決しようとする課題〕 しかるにこのような従来の光電スイッチによれば、受
光素子３からの受光信号を増幅回路4,波形整形回路５を
介して増幅及び波形整形しているが、信号として必要な
時間帯は発振回路の出力によって投光素子２が駆動され
る間、即ち点灯している間のみである。投光素子２が消
灯している間も増幅回路４より何らかの出力が得られる
が、その信号は外来光等の影響を除くためにゲート回路
６によって取り除かれクロック周期のみの受光信号が積
分回路７に与えられる。従って増幅回路４や波形整形回
路５への電流供給は投光素子が消灯している時間帯では
不要である。特にパルス点灯周期が短い高速型の光電ス
イッチでは増幅回路４や波形整形回路５の消費電流が大
きく、無駄な電力消費となっていた。[Problems to be Solved by the Invention] However, according to such a conventional photoelectric switch, the light-receiving signal from the light-receiving element 3 is amplified and waveform-shaped through the amplifier circuit 4 and the waveform shaping circuit 5. The time zone required as is only while the light projecting element 2 is driven by the output of the oscillation circuit, that is, while the light emitting element 2 is on. Although some output is obtained from the amplifier circuit 4 even while the light projecting element 2 is off, the signal is removed by the gate circuit 6 in order to eliminate the influence of external light and the like, and the light receiving signal of only the clock cycle is integrated circuit 7 Given to. Therefore, the current supply to the amplifier circuit 4 and the waveform shaping circuit 5 is unnecessary during the time period when the light projecting element is off. In particular, in a high-speed type photoelectric switch having a short pulse lighting cycle, the amplifier circuit 4 and the waveform shaping circuit 5 consume a large amount of current, resulting in unnecessary power consumption.
本発明はこのような従来の光電スイッチの問題点に鑑
みてなされたものであって、発振回路の出力によって投
光素子を駆動すると共にその必要な間のみ増幅回路や波
形整形回路等に電源を供給することによって低消費電力
化を図るようにすることを技術的課題とする。The present invention has been made in view of the above problems of the conventional photoelectric switch, and drives the light projecting element by the output of the oscillation circuit and supplies the power source to the amplifier circuit, the waveform shaping circuit, and the like only during the necessary period. A technical issue is to achieve low power consumption by supplying power.
（課題を解決するための手段） 本発明はクロック信号を発生する発振回路と、クロッ
ク信号に基づいてパルス点灯される投光素子と、投光素
子が発生する光を受光する受光素子と、受光素子の出力
を増幅する増幅回路と、増幅回路の出力を波形整形する
波形整形回路と、波形整形回路の出力をクロック信号に
同期して通過させるゲート回路と、ゲート回路の出力を
積分する積分回路と、を有する光電スイッチであって、
クロック信号に同期した信号によって増幅回路及び波形
整形回路に与える電流を断続する電流制御手段を有する
と共に、積分回路には光電スイッチの検出動作中常時通
電することを特徴とするものである。(Means for Solving the Problem) The present invention relates to an oscillation circuit that generates a clock signal, a light projecting element that is pulse-lit based on the clock signal, a light receiving element that receives light generated by the light projecting element, and a light receiving element. An amplification circuit for amplifying the output of the element, a waveform shaping circuit for shaping the output of the amplification circuit, a gate circuit for passing the output of the waveform shaping circuit in synchronization with a clock signal, and an integration circuit for integrating the output of the gate circuit And a photoelectric switch having
It is characterized in that it has current control means for connecting and disconnecting the current to be given to the amplification circuit and the waveform shaping circuit by a signal synchronized with the clock signal, and that the integration circuit is always energized during the detection operation of the photoelectric switch.
（作用） このような特徴を有する本発明によれば、発振回路に
よって投光素子をパルス点灯すると共にその発振出力に
同期した電流切換信号によって増幅回路及び波形整形回
路に与える電流源の電流を断続するようにしている。こ
うすれば必要な間のみ増幅回路と波形整形回路に電源が
供給され、受光素子より得られる受光信号が必要な間の
み波形整形されて信号処理されることとなる。(Operation) According to the present invention having such a feature, the light emitting element is pulse-lighted by the oscillation circuit and the current of the current source given to the amplification circuit and the waveform shaping circuit is intermittently supplied by the current switching signal synchronized with the oscillation output. I am trying to do it. In this way, power is supplied to the amplifier circuit and the waveform shaping circuit only when necessary, and the light reception signal obtained from the light receiving element is subjected to waveform shaping and signal processing only when necessary.
（発明の効果） そのため本発明によれば、増幅回路や波形整形回路等
に不要な電流が供給されることがなく低消費電力化を進
めることができる。従ってパルス点灯周期が短い高速型
の光電スイッチにおいても、比較的大きい電流を消費す
る増幅回路や波形整形回路の消費電力を大幅に低減する
ことができるという効果が得られる。(Effects of the Invention) Therefore, according to the present invention, low power consumption can be promoted without supplying unnecessary current to the amplifier circuit, the waveform shaping circuit, and the like. Therefore, even in a high-speed type photoelectric switch having a short pulse lighting cycle, it is possible to significantly reduce the power consumption of the amplifier circuit and the waveform shaping circuit that consume a relatively large current.
第１図は本発明の一実施例による光電スイッチのブロ
ック図である。本図において従来例と同一部分は同一符
号を付している。本実施例においても発振回路１により
一定の周期でクロック信号を発振しており、その出力は
投光素子２に与えられる。発振回路１のクロック信号は
例えばデューティ比が数％程度であり発振回路１のクロ
ック周期の前後に一定の幅を持つクロック信号が電流切
換回路21にも与えられる。電流切換回路21はこの信号に
基づいて後述する電流源22及び23に制御信号を与えてそ
の電流を断続するものである。又投光素子２からの光は
物体の検知領域を介して受光素子３に与えられる。反射
型光電スイッチでは検知領域を通過する物体からの反射
光によって受光領域に受光信号が与えられる。受光素子
の出力は増幅回路４を介して波形整形回路５に与えられ
る。波形整形回路５は入力信号を所定の閾値で弁別する
ことによって方形波信号を出力するものであり、その出
力はゲート回路６に与えられる。ゲート回路６は前述し
た発振回路１の発振周期、即ち投光素子の駆動信号に対
応する期間ゲートが開放され、その間の波形整形回路５
からの出力のみを積分回路７に伝えるものである。積分
回路７はこの信号を積分して積分出力を波形整形回路８
に与える。波形整形回路８には一定の閾値が設定されて
おり、この閾値を越える場合には出力回路９を介して外
部に物体検知出力が与えられる。又電流切換回路21の出
力は電流源22,23に与えられる。電流源22,23は夫々増幅
回路４及び波形整形回路５に与えられている。ここで電
流切換回路21,電流源22,23は増幅回路４及び波形整形回
路５に与える電流を制御する電流制御手段を構成してい
る。FIG. 1 is a block diagram of a photoelectric switch according to an embodiment of the present invention. In this figure, the same parts as those of the conventional example are denoted by the same reference numerals. Also in this embodiment, the oscillation circuit 1 oscillates a clock signal at a constant cycle, and its output is given to the light projecting element 2. The duty ratio of the clock signal of the oscillator circuit 1 is, for example, about several percent, and a clock signal having a constant width before and after the clock cycle of the oscillator circuit 1 is also given to the current switching circuit 21. Based on this signal, the current switching circuit 21 supplies a control signal to current sources 22 and 23, which will be described later, to interrupt the current. The light from the light projecting element 2 is given to the light receiving element 3 through the detection area of the object. In the reflection type photoelectric switch, a light receiving signal is given to the light receiving area by the reflected light from the object passing through the detection area. The output of the light receiving element is given to the waveform shaping circuit 5 via the amplifier circuit 4. The waveform shaping circuit 5 outputs a square wave signal by discriminating an input signal with a predetermined threshold value, and its output is given to the gate circuit 6. In the gate circuit 6, the gate is opened during the oscillation period of the oscillation circuit 1 described above, that is, the period corresponding to the drive signal of the light projecting element, and the waveform shaping circuit 5 during that period.
Only the output from is transmitted to the integrating circuit 7. The integrating circuit 7 integrates this signal and outputs an integrated output as a waveform shaping circuit 8
Give to. A fixed threshold value is set in the waveform shaping circuit 8, and when the threshold value is exceeded, an object detection output is given to the outside via the output circuit 9. The output of the current switching circuit 21 is given to the current sources 22 and 23. The current sources 22 and 23 are given to the amplifier circuit 4 and the waveform shaping circuit 5, respectively. Here, the current switching circuit 21 and the current sources 22 and 23 constitute current control means for controlling the current supplied to the amplifier circuit 4 and the waveform shaping circuit 5.
次に本実施例の動作についてタイムチャートを参照し
つつ説明する。第２図（ａ）は発振回路１の発振出力を
示すものであり、この出力によって投光素子２が時間T1
に点灯,T2に消灯となるようにパルス点灯されると共に
ゲート信号としてゲート回路６にも伝えられる。又第２
図（ｃ）に示すように発振信号と同期しこの前後に一定
の時間幅を持つ電流制御信号が電流切換回路21に与えら
れる。電流切換回路21はこの信号に基づいて電流源22,2
3を駆動するものである。さて第２図（ｂ）に示すよう
に時刻t1に物体が通過して投光素子２から照射した光の
反射光が受光されたものとすると、電流切換信号に対応
する期間のみで増幅回路を介して増幅されるため第２図
（ｂ）に示すように増幅回路４より増幅信号が得られ
る。この信号が第２図（ｄ）に示すように所定の閾値レ
ベルを越える場合には波形整形回路５より波形整形信号
が得られ、ゲート回路６を介して積分回路７に与えられ
る。従って積分回路７より第２図（ｅ）に示すような信
号が出力されることとなる。そして積分出力が所定の閾
値を越える場合には第２図（ｆ）に示すように波形整形
出力が得られ物体の検知信号を外部に出力することがで
きる。ここで増幅回路4,波形整形回路５に電流を供給す
る周期T3は供給しない周期T4より充分短くこの比を例え
ば20:1とする。そして周期T3の期間に消費される電流を
I3,T4の期間に使用される電流をI4とし、その間の平均
電流をITとすれば、高速性を要求するため増幅回路４及
び波形整形回路５には比較的大電流を流す必要があるた
め、I3＝10I4程度の電流比となっている。従って本実施
例による例えば光電スイッチの平均電流は常に電流I3を
流す場合に較べて約14％程度となり、大幅に低消費電力
化を図ることができる。Next, the operation of this embodiment will be described with reference to a time chart. FIG. 2 (a) shows the oscillation output of the oscillation circuit 1, which causes the light projecting element 2 to output the time T1.
The pulse is turned on so that it is turned on and turned off at T2, and it is also transmitted to the gate circuit 6 as a gate signal. Second
As shown in FIG. 6C, a current control signal synchronized with the oscillation signal and having a constant time width before and after this is given to the current switching circuit 21. Based on this signal, the current switching circuit 21 outputs the current sources 22,2
The one that drives the three. Now, assuming that the reflected light of the light emitted from the light projecting element 2 is received by the object passing at time t 1 as shown in FIG. 2 (b), the amplifier circuit is generated only during the period corresponding to the current switching signal. Since the signal is amplified via the amplifier, an amplified signal is obtained from the amplifier circuit 4 as shown in FIG. When this signal exceeds a predetermined threshold level as shown in FIG. 2D, a waveform shaping signal is obtained from the waveform shaping circuit 5 and given to the integrating circuit 7 via the gate circuit 6. Therefore, the integrating circuit 7 outputs a signal as shown in FIG. When the integrated output exceeds the predetermined threshold value, the waveform shaping output is obtained as shown in FIG. 2 (f), and the object detection signal can be output to the outside. Here, the period T3 for supplying the current to the amplifier circuit 4 and the waveform shaping circuit 5 is sufficiently shorter than the period T4 for not supplying the current, and this ratio is set to, for example, 20: 1. And the current consumed during the period of cycle T3
If the current used during the period of I 3 and T 4 is I 4, and the average current between them is I T , it is necessary to pass a relatively large current through the amplifier circuit 4 and the waveform shaping circuit 5 because high speed is required. Therefore, the current ratio is about I 3 = 10I 4 . Therefore, the average current of, for example, the photoelectric switch according to the present embodiment is about 14% as compared with the case where the current I 3 is always passed, and the power consumption can be significantly reduced.
尚本実施例は発振回路の投光パルスの前後に一定の時
間幅を有する電流制御信号によって一対の電流源22,23
を介して増幅回路4,波形整形回路５に電流を供給するよ
うにしているが、第３図（ａ），（ｂ）に示すように発
振回路１のクロック信号を直接電流源22,23に与えて電
流の供給を制御してもよい。又第４図（ａ），（ｂ）に
示すように投光パルスの投光前の一定期間から投光が終
了するまでの間電流を供給するようにしてもよい。こう
すれば増幅回路，波形整形回路が充分安定した状態で投
光が開始されることとなるため、検出性能を安定化する
ことができる。又第５図（ａ），（ｂ）に示すように発
振信号の一部を電流切換信号として用いてその間のみ増
幅回路と波形整形回路に電流を供給することによって更
に低電流化を進めることができる。これらのいずれの場
合にも本発明では投光パルスに同期した間のみ増幅回路
と波形整形回路を動作させるため、ゲート回路を用いな
くても一定の外乱光の除去効果が得られる。In this embodiment, a pair of current sources 22 and 23 are provided by a current control signal having a constant time width before and after the light emitting pulse of the oscillation circuit.
Although the current is supplied to the amplifier circuit 4 and the waveform shaping circuit 5 via the, the clock signal of the oscillation circuit 1 is directly supplied to the current sources 22 and 23 as shown in FIGS. 3 (a) and 3 (b). It may be applied to control the supply of current. Further, as shown in FIGS. 4 (a) and 4 (b), the current may be supplied from a fixed period before the projection of the projection pulse to the end of the projection. By doing so, light emission is started in a state where the amplifier circuit and the waveform shaping circuit are sufficiently stable, so that the detection performance can be stabilized. Further, as shown in FIGS. 5 (a) and 5 (b), a part of the oscillation signal is used as a current switching signal, and the current is supplied to the amplifier circuit and the waveform shaping circuit only during that period to further reduce the current. it can. In any of these cases, according to the present invention, the amplifying circuit and the waveform shaping circuit are operated only during synchronization with the light projection pulse, so that a constant disturbance light removal effect can be obtained without using a gate circuit.
第１図は本発明の一実施例による光電スイッチの全体構
成を示すブロック図、第２図は本実施例の各部の波形を
示すタイムチャート、第３図（ａ），（ｂ）、第４図
（ａ），（ｂ）及び第５図（ａ），（ｂ）は本発明の夫
々異なる実施例による投光パルスと電流切換信号を示す
タイムチャート、第６図は従来の光電スイッチの一例を
示すブロック図である。 １……発振回路、２……投光素子、３……受光素子、４
……増幅回路、5,8……波形整形回路、６……ゲート回
路、７……積分回路、21……電流切換回路、22,23……
電流源FIG. 1 is a block diagram showing an overall configuration of a photoelectric switch according to an embodiment of the present invention, FIG. 2 is a time chart showing waveforms of respective parts of this embodiment, FIGS. 3 (a), 3 (b) and 4 5 (a) and 5 (b) and FIGS. 5 (a) and 5 (b) are time charts showing a light projecting pulse and a current switching signal according to different embodiments of the present invention, and FIG. 6 is an example of a conventional photoelectric switch. It is a block diagram showing. 1 ... Oscillation circuit, 2 ... Emitter element, 3 ... Photodetector element, 4
…… Amplifier circuit, 5,8 …… Wave shaping circuit, 6 …… Gate circuit, 7 …… Integrator circuit, 21 …… Current switching circuit, 22,23 ……
Current source
Claims (1)
クロック信号に基づいてパルス点灯される投光素子と、
前記投光素子が発生する光を受光する受光素子と、前記
受光素子の出力を増幅する増幅回路と、前記増幅回路の
出力を波形整形する波形整形回路と、前記波形整形回路
の出力を前記クロック信号に同期して通過させるゲート
回路と、前記ゲート回路の出力を積分する積分回路と、
を有する光電スイッチにおいて、 前記クロック信号に同期した信号によって前記増幅回路
及び波形整形回路に与える電流を断続する電流制御手段
を有すると共に、前記積分回路には光電スイッチの検出
動作中常時通電することを特徴とする光電スイッチ。1. An oscillating circuit for generating a clock signal, and a light projecting element which is pulse-lit based on the clock signal.
A light receiving element that receives light generated by the light projecting element, an amplifier circuit that amplifies the output of the light receiving element, a waveform shaping circuit that shapes the waveform of the output of the amplifier circuit, and an output of the waveform shaping circuit that is the clock. A gate circuit for passing the signal in synchronism with the signal, and an integrating circuit for integrating the output of the gate circuit,
In the photoelectric switch having, a current control means for connecting and disconnecting a current given to the amplifier circuit and the waveform shaping circuit by a signal synchronized with the clock signal is provided, and the integration circuit is always energized during a detection operation of the photoelectric switch. A featured photoelectric switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63113059A JP2671377B2 (en) | 1988-05-09 | 1988-05-09 | Photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63113059A JP2671377B2 (en) | 1988-05-09 | 1988-05-09 | Photoelectric switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01282923A JPH01282923A (en) | 1989-11-14 |
| JP2671377B2 true JP2671377B2 (en) | 1997-10-29 |
Family
ID=14602458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63113059A Expired - Fee Related JP2671377B2 (en) | 1988-05-09 | 1988-05-09 | Photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2671377B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5030891A (en) * | 1988-11-30 | 1991-07-09 | Omron Tateisi Electronic Co. | Photoelectric switch |
| JP2553806B2 (en) * | 1992-09-11 | 1996-11-13 | サンクス株式会社 | Photoelectric switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119646U (en) * | 1983-01-31 | 1984-08-13 | 松下電工株式会社 | photoelectric switch |
| JPS6238625A (en) * | 1985-08-13 | 1987-02-19 | Toa Tokushu Denki Kk | Battery saving device |
-
1988
- 1988-05-09 JP JP63113059A patent/JP2671377B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01282923A (en) | 1989-11-14 |
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