JPS5932838B2 - photoelectric detector - Google Patents
photoelectric detectorInfo
- Publication number
- JPS5932838B2 JPS5932838B2 JP8009579A JP8009579A JPS5932838B2 JP S5932838 B2 JPS5932838 B2 JP S5932838B2 JP 8009579 A JP8009579 A JP 8009579A JP 8009579 A JP8009579 A JP 8009579A JP S5932838 B2 JPS5932838 B2 JP S5932838B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- circuit
- power
- power supply
- light source
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Description
【発明の詳細な説明】
本発明は、発光部と受光部とを分離して配置し、煙その
他による透過光線の遮断又は減衰を発光部と受光部とを
同期させて検出する光電式検出器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a photoelectric detector in which a light emitting part and a light receiving part are arranged separately, and the light emitting part and the light receiving part are synchronized to detect the blocking or attenuation of transmitted light due to smoke or the like. Regarding.
空間の煙濃度、透過率を測定しようとする場合、光源を
有する発光部からの光を受光部で検出して、発光部、受
光部間の光の透過率或は減光率を求めているが、受光部
には、発光部光源からの光だけでなく、外乱光として蛍
光灯などの変調光が入射しており、これを除去しないと
正確な透過率或は減光率が測定できないことが知られて
いる。When trying to measure smoke density and transmittance in a space, the light from a light emitting part with a light source is detected by a light receiving part, and the transmittance or attenuation rate of light between the light emitting part and the light receiving part is determined. However, in addition to the light from the light source of the light emitting part, modulated light from fluorescent lamps and other sources enters the light receiving part as disturbance light, and unless this is removed, accurate transmittance or light attenuation cannot be measured. It has been known.
従来、これを解決する手段として、1発光部から照射す
る光をメカニカルチョッパ等で変調し、受光部で復調す
る第1の方法、2発光部の光源を例えば1KH2で駆動
し、受光部でlKH2のフィルタを介して受光信号を処
理する第2の方法、3発光部を間歇的に、駆動する一方
、受光部に対して間歇パルスに同期した信号を送り、受
光部では間歇パルスに同期した受光信号のみを処理する
第3の方法等がある。しかしながら、第1の方法は、機
械的要素があるため、高価になり易く、又寿命も短いな
どの欠点がある。Conventionally, as a means to solve this problem, the first method is to modulate the light emitted from one light emitting section using a mechanical chopper or the like and demodulate it at the light receiving section.The light source of the two light emitting sections is driven at, for example, 1KH2, and the light emitted from the light receiving section is driven at 1KH2. The second method is to process the received light signal through a filter, in which the three light emitting parts are driven intermittently, while a signal synchronized with the intermittent pulse is sent to the light receiving part, and the light receiving part receives light in synchronization with the intermittent pulse. There is a third method of processing only the signal, etc. However, the first method has drawbacks such as being expensive and having a short lifespan due to the presence of mechanical elements.
又、第2の方法は、一般に外乱光の高周波成分がフィル
タの通過帯域内に含まれる場合があり、外乱光に対する
受光信号のSN比が悪いという欠点がある。これに対し
、第3の方法は、上記第2の方法と比較して、発光部が
間歇的に発光し、且つ受光部はその間歇光と同期して受
光するため、外乱光に対する受光信号のSN比が良く、
一般的に広く利用されている。ところが、これを火災感
知器等に利用した場合、発光部及び受光部の電源は、火
災報知機受信機から供給され、発光部、受光部間に前記
間歇パルスを送受する信号線路を別途必要とするため、
設置工事上問題があつた。即ち、分離型の火災感知器等
は、倉庫等に設置され、発光部と受光部との距離が数m
から100mにも及ぶため、線路数の増加が大きな問題
となつている。又、受光部側から発光部側への電源線路
についても、線路抵抗による電圧降下のため光源の発光
輝度が低下するという問題があつた。本発明は、上記問
題点を解決すべくなされたもので、受光部側から発光部
に間歇的に電源を供給して発光部のコンデンサを充電し
、電源非供給時に発光部のコンデンサの充電電荷から電
力の供給を行ない、光源を間歇的に発光させると共に、
上記電源の間歇供給に対する反転出力により受光信号を
スイツチングして信号処理回路に入力せしめることによ
り、発光部と受光部間に間歇パルスを送受する特別の信
号線路を必要とせず、発光部の間歇的発光に同期して受
光信号を処理することができ、且つ、線路抵抗にほとん
ど影響されることなく光源を所定輝度で発光させること
ができる光電式検出器を提供することを目的とする。以
下、図面に示す一実施例に基づき本発明を説明する。Further, the second method generally has a drawback that the high frequency component of the disturbance light may be included in the pass band of the filter, and the S/N ratio of the received light signal with respect to the disturbance light is poor. On the other hand, in the third method, compared to the second method, the light emitting part emits light intermittently, and the light receiving part receives light in synchronization with the intermittent light. Good signal to noise ratio,
Generally widely used. However, when this is used in a fire detector, etc., the power for the light emitting part and the light receiving part is supplied from the fire alarm receiver, and a signal line for transmitting and receiving the intermittent pulses between the light emitting part and the light receiving part is required separately. In order to
There was a problem with the installation work. In other words, separate fire detectors are installed in warehouses, etc., and the distance between the light emitting part and the light receiving part is several meters.
The increase in the number of lines has become a major problem, as the line can extend up to 100 meters from the line. Further, regarding the power supply line from the light receiving section side to the light emitting section side, there is a problem in that the luminance of the light source decreases due to a voltage drop due to the line resistance. The present invention has been made in order to solve the above-mentioned problems, and the present invention charges the capacitor of the light emitting part by intermittently supplying power from the light receiving part to the light emitting part, and reduces the charging charge of the capacitor of the light emitting part when power is not supplied. The light source is intermittently emitted by supplying power from the
By switching the received light signal using the inverted output for the intermittent supply of the power supply and inputting it to the signal processing circuit, there is no need for a special signal line for transmitting and receiving intermittent pulses between the light emitting part and the light receiving part, and the intermittent supply of the light emitting part is eliminated. It is an object of the present invention to provide a photoelectric detector which can process a light reception signal in synchronization with light emission and can cause a light source to emit light at a predetermined brightness almost unaffected by line resistance. The present invention will be explained below based on an embodiment shown in the drawings.
第1図は、本発明の一実施例を示すプロツク図であり、
第2図は、上記実施例における発光部の具体例を示す回
路図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a specific example of the light emitting section in the above embodiment.
第1図の実施例は、電源供給判別回路1、充電回路2、
発振回路3、光源駆動回路4及び光源5からなる発光部
と、光電変換回路6、増幅回路7、フイルタ回路8、信
号処理回路9、間歇電源供給回路10及び受光信号スイ
ツチング回路13からなる受光部とから構成される。又
、発光部と受光部とは、分離して設置され、電源線路1
4,14を介して接続されると共に、光源5と光電変換
回路6とで、レンズ等の光学系15を介して光信号が送
受される。電源供給判別回路1は、例えば第2図に示す
ようなインバータ1aからなり、電源線路14に接続さ
れ、電源供給の有無を判別し、電源非供給時に制御信号
を発生し、これを発振回路3に入力せしめる。この電源
供給判別回路1は、発振回路3の動作を制御するもので
あればよく、発振回路3が電源線路14間の電圧の有無
によつて作動、停止する場合には省略できることはいう
までもない。後述するように、発光部への電源は、間歇
電源供給回路10から間歇的に供給されるため、この制
御信号も電源に同期して間歇的に出力される。充電回路
2は、例えば第2図に示すように、コンデンサ2aとダ
イオード2bとから構成され、間歇的に供給される電源
電流を充電し、電源非供給時に放電して光源5の駆動電
源となる。この充電回路2に対する突入電流を逓減する
目的で、ダイオード2bと直列に抵抗又は定電流回路を
設けてもよい。なお、第2図のダイオード3a及びコン
デンサ3bは、コンデンサ2aの充放電により発振回路
3の電源電圧が変動しないようにするためのものである
。発振回路3と光源,駆動回路4とは、光源5を特定の
周波数で発光させる回路である。The embodiment shown in FIG. 1 includes a power supply determination circuit 1, a charging circuit 2,
A light emitting section consisting of an oscillation circuit 3, a light source driving circuit 4, and a light source 5, and a light receiving section consisting of a photoelectric conversion circuit 6, an amplifier circuit 7, a filter circuit 8, a signal processing circuit 9, an intermittent power supply circuit 10, and a light receiving signal switching circuit 13. It consists of In addition, the light emitting part and the light receiving part are installed separately, and the power line 1
4 and 14, and optical signals are transmitted and received between the light source 5 and the photoelectric conversion circuit 6 via an optical system 15 such as a lens. The power supply determination circuit 1 includes, for example, an inverter 1a as shown in FIG. input. It goes without saying that this power supply determination circuit 1 can be omitted as long as it controls the operation of the oscillation circuit 3, and it can be omitted if the oscillation circuit 3 operates and stops depending on the presence or absence of voltage across the power supply line 14. do not have. As will be described later, since power to the light emitting section is intermittently supplied from the intermittent power supply circuit 10, this control signal is also output intermittently in synchronization with the power supply. As shown in FIG. 2, for example, the charging circuit 2 is composed of a capacitor 2a and a diode 2b, and charges the power supply current supplied intermittently, and discharges it when the power supply is not supplied, and serves as a driving power source for the light source 5. . In order to reduce the rush current to the charging circuit 2, a resistor or a constant current circuit may be provided in series with the diode 2b. Note that the diode 3a and capacitor 3b in FIG. 2 are used to prevent the power supply voltage of the oscillation circuit 3 from changing due to charging and discharging of the capacitor 2a. The oscillation circuit 3 and the light source/drive circuit 4 are circuits that cause the light source 5 to emit light at a specific frequency.
発振回路3は、上記電源供給判別回路1の制御信号が入
力すると特定周波数で発振し、その出力が光源5駆動回
路4に入力される。又、光源駆動回路4は、上記充電回
路2に接続され、その充電電荷を利用して、上記発振回
路3の出力で変調し、光源5を特定周波数で断続的且つ
間歇的に発光させる。この光源駆動回路4は、例えば第
2図に示すように、トランジスタ4aと抵抗4bとから
構成され、該トランジスタ4aのベースに発振回路の出
力を接続することにより、充電回路2の充電電荷を放電
させ、光源5を発振周波数で変調,駆動する。なお、電
源供給判別回路1の制御信号により光源5を駆動するよ
う構成してもよく、この場合は発振回路3を省略できる
。光源5は、例えば発光ダイオードからなり、上記光源
5駆動回路4により点灯される。The oscillation circuit 3 oscillates at a specific frequency when the control signal of the power supply determination circuit 1 is input, and its output is input to the light source 5 drive circuit 4. Further, the light source driving circuit 4 is connected to the charging circuit 2, and modulates the output of the oscillation circuit 3 using the charged electric charge to cause the light source 5 to emit light intermittently at a specific frequency. For example, as shown in FIG. 2, the light source drive circuit 4 is composed of a transistor 4a and a resistor 4b. By connecting the output of an oscillation circuit to the base of the transistor 4a, the charge in the charging circuit 2 is discharged. The light source 5 is modulated and driven at the oscillation frequency. Note that the light source 5 may be configured to be driven by a control signal from the power supply determination circuit 1, and in this case, the oscillation circuit 3 can be omitted. The light source 5 is made of, for example, a light emitting diode, and is turned on by the light source 5 drive circuit 4 described above.
なお、光源5としては、半導体レーザ等が使用できる。
光電変換回路6は、Siホトダイオード等からなり、上
記光源5からの光信号を電気信号に変換する機能を果す
。増幅回路7は、光電変換回路6において電気信号に変
換された光信号(以下受光信号という。)を増幅する。
フイルタ回路8は、増幅された受光信号から特定の周波
数の信号のみ通過させ、雑音を除去する作用を営む。又
、信号処理回路9は、受光信号と基準値とを比較し、受
光信号が所定レベル以下であると警報信号を発生する回
路である。これらは、従来の透過率測定装置において使
用されているものと同様である。間歇電源供給回路10
は、パルス発生回路11とスイツチ回路12とからなり
、発光部へ電源を間歇的に供給すると共に、該電源の間
歇供給に対する反転出力を発生する作用を営む回路であ
る。パルス発生回路11は、発光部に電源を間歇的に供
給するため、一定のパルス幅とパルス間隔を有するパル
スを発生する。パルス間隔とパルス幅の比は、電源線路
14のインピーダンスと光源の間歇的発光の間隔とから
定められ、例えば、10対1程度とする。スイツチ回路
12は、上記パルスを電源線路14を介して発光部側に
送出すると共に、該パルスを反転した波形のパルスを発
生する。この反転波形のパルスは、電源の間歇供給に対
する反転出力として受光信号スイツチング回路13に入
力される。受光信号スイツチング回路13は、上記フイ
ルタ回路8と信号処理回路9との間に挿入され、例えば
アナログスイツチのごとき特性を有するもので、上記反
転出力に応動して受光信号を信号処理回路9に入力せし
める。Note that as the light source 5, a semiconductor laser or the like can be used.
The photoelectric conversion circuit 6 is composed of a Si photodiode or the like, and functions to convert the optical signal from the light source 5 into an electrical signal. The amplifier circuit 7 amplifies the optical signal (hereinafter referred to as a light reception signal) converted into an electrical signal by the photoelectric conversion circuit 6.
The filter circuit 8 functions to remove noise by passing only signals of a specific frequency from the amplified light reception signal. Further, the signal processing circuit 9 is a circuit that compares the light reception signal with a reference value and generates an alarm signal when the light reception signal is below a predetermined level. These are similar to those used in conventional transmittance measurement devices. Intermittent power supply circuit 10
This circuit consists of a pulse generation circuit 11 and a switch circuit 12, and has the function of intermittently supplying power to the light emitting section and generating an inverted output in response to the intermittent supply of the power. The pulse generating circuit 11 generates pulses having a constant pulse width and pulse interval in order to intermittently supply power to the light emitting section. The ratio of the pulse interval to the pulse width is determined from the impedance of the power supply line 14 and the interval of intermittent light emission of the light source, and is, for example, about 10:1. The switch circuit 12 sends out the pulse to the light emitting section side via the power supply line 14, and also generates a pulse having a waveform that is an inversion of the pulse. The pulse of this inverted waveform is input to the light reception signal switching circuit 13 as an inverted output for intermittent power supply. The light reception signal switching circuit 13 is inserted between the filter circuit 8 and the signal processing circuit 9, and has characteristics similar to, for example, an analog switch, and inputs the light reception signal to the signal processing circuit 9 in response to the inverted output. urge
この受光信号スイツチング回路13の動作は、上記反転
出力が入力している間スイツチを閉成し、入力していな
いときスイツチを開成することにより行なう。なお、受
光信号スイツチング回路13は、上記位置に限定されず
、信号処理回路9に入力する受光信号をスイツチングし
得るならば他の位置に挿入することもできる。次に、こ
の実施例の動作について説明する。The light reception signal switching circuit 13 operates by closing the switch while the inverted output is being input, and opening the switch when it is not being input. Note that the light receiving signal switching circuit 13 is not limited to the above-mentioned position, but may be inserted at any other position as long as it can switch the light receiving signal input to the signal processing circuit 9. Next, the operation of this embodiment will be explained.
第3図は、上記実施例の光電式検出器の動作状態を示す
動作線図で、A−Fは、各々第1図のプロツク図に示す
同符号の点における電圧・電流波形を示す。間歇電源供
給回路10は、電源線路14を介して発光部側に間歇的
に電源を供給する。FIG. 3 is an operating diagram showing the operating state of the photoelectric detector of the above embodiment, and A to F indicate voltage and current waveforms at points with the same symbols shown in the block diagram of FIG. 1, respectively. The intermittent power supply circuit 10 intermittently supplies power to the light emitting section via the power line 14.
第3図Aは、この電源波形を示す。又、同時に、間歇電
源供給回路10は、上記電源の間歇供給に対する反転出
力を受光信号スイツチング回路13に送出する。この反
転出力の波形を第3図Bに示す。なお、第3図Bの波形
は、発光部に光源を供給しているときに受光信号スイツ
チング回路13を開成するものであればよいことを示し
たもので、この動作が確保できれば、必ずしも第3図A
の反転出力である必要はない。一方、発光部側では、電
源供給判別回路1が、間歇的に供給される電源の供給の
有無を検出すると共に、電源非供給時に、第3図Dに示
すように反転出力に同期した制御信号を出力する。FIG. 3A shows this power supply waveform. At the same time, the intermittent power supply circuit 10 sends an inverted output for the intermittent power supply to the light reception signal switching circuit 13. The waveform of this inverted output is shown in FIG. 3B. Note that the waveform in FIG. 3B shows that it is sufficient if the light reception signal switching circuit 13 is opened while the light source is being supplied to the light emitting section, and if this operation can be ensured, the third Diagram A
It does not need to be an inverted output. On the other hand, on the light emitting part side, the power supply determination circuit 1 detects the presence or absence of the intermittently supplied power, and also outputs a control signal synchronized with the inverted output when the power is not supplied, as shown in FIG. 3D. Output.
この制御信号の入力に伴なつて、発振回路3が間歇的に
特定周波数(例えば数KHz)で発振する。第3図Eは
この発振回路の出力波形を示す。又、充電回路2は、間
歇的に供給される電源により充電され、電源非供給時に
光源駆動回路4を経て放電される。As this control signal is input, the oscillation circuit 3 intermittently oscillates at a specific frequency (for example, several KHz). FIG. 3E shows the output waveform of this oscillation circuit. Further, the charging circuit 2 is charged by the power supplied intermittently, and is discharged through the light source drive circuit 4 when the power is not supplied.
第3図Cは、この充放電電圧の変化を示す。同図から明
らかなように、充放電は電源の間歇的供給と同期して行
なわれる。充電回路2の充電時定数は、コンデンサ2a
の容量と電源線路の線路抵抗等によつて定まるから、電
源供給時のパルス幅を、光源,駆動時のパルス幅と比較
して十分長くしておけば、コンデンサ2aは電源供給時
に所定量の電荷を蓄積し得る。光源駆動回路4において
光源5は、上記発振回路3の出力によりコンデンサ2a
の充電電荷から電源の供給を受けて発光するため、該発
振回路3の出力と同様の波形で断続的且つ間歇的に発光
する。FIG. 3C shows this change in charge/discharge voltage. As is clear from the figure, charging and discharging are performed in synchronization with the intermittent supply of power. The charging time constant of the charging circuit 2 is the capacitor 2a.
Since it is determined by the capacity of the capacitor 2a and the line resistance of the power supply line, if the pulse width when power is supplied is made sufficiently long compared to the pulse width when driving the light source, the capacitor 2a will be Can accumulate charge. In the light source drive circuit 4, the light source 5 is connected to the capacitor 2a by the output of the oscillation circuit 3.
Since it emits light by receiving power from the charged charges, it emits light intermittently and intermittently with the same waveform as the output of the oscillation circuit 3.
この場合、光源の消費電力の大部分は、コンデンサ2a
の充電電荷から供給されるため、光源5の発光輝度が線
路抵抗の影響により変化することはない。又、本実施例
では、光源の駆動開始からコンデンサ2aの充電電荷が
徐々に減少し、発光輝度も時間の経過と共に減少するが
、このような問題点を解決するには、光源駆動回路4の
トランジスタ4aを定電流で駆動すればよい。光源5か
らの光信号は、光電変換回路6、増幅回路7及びフイル
タ回路8を経て受光信号スイツチング回路13に達する
。In this case, most of the power consumption of the light source is consumed by the capacitor 2a.
Since the light emitted from the light source 5 is supplied from the charged charge, the luminance of the light source 5 does not change due to the influence of the line resistance. In addition, in this embodiment, the charge in the capacitor 2a gradually decreases from the start of driving the light source, and the luminance of light emission also decreases with the passage of time. The transistor 4a may be driven with a constant current. The optical signal from the light source 5 passes through a photoelectric conversion circuit 6, an amplifier circuit 7, and a filter circuit 8, and reaches a light reception signal switching circuit 13.
この受光信号スイツチング回路13は、第3図Fに示す
ように、間歇電源供給回路10の反転出力と同期して閉
成され、又、光源5の間歇的発光も反転出力と同期して
いるから、光源5からの受光信号のみが信号処理回路9
に入力され、同期していない他の外乱光による雑音は遮
断される。したがつて、本発明の光電式検出器を減光式
分離型火災感知器に使用した場合、外乱光の影響を最少
限とすることができるため、SN比は大幅に改善され、
煙による光信号の減衰を高精度に検出することができる
。This light reception signal switching circuit 13 is closed in synchronization with the inverted output of the intermittent power supply circuit 10, as shown in FIG. 3F, and the intermittent light emission of the light source 5 is also synchronized with the inverted output. , only the light reception signal from the light source 5 is processed by the signal processing circuit 9.
, and noise caused by other unsynchronized disturbance light is blocked. Therefore, when the photoelectric detector of the present invention is used in a dimming separation type fire detector, the influence of ambient light can be minimized, so the S/N ratio is significantly improved.
Attenuation of optical signals due to smoke can be detected with high accuracy.
又、赤外線侵入検出器に使用した場合にも、光源以外か
ら入射した外乱光の影響を除去でき、上記同様高精度に
侵入検出ができる。なお、光源を間歇的に発光させるだ
けでなく、上記実施例の如く、光源を発振回路の出力に
より変調して特定の周波数で断続的且つ間歇的に発光さ
せることにより、外乱光の影響が多い場所ではより効果
的である。以上説明したように、本発明は、上記のよう
に構成することにより、受光部側から間歇的に供給され
る電源を発光部において充電し、電源非供給時に放電電
流により光源を間歇的に発光させると共に、上記電源の
間歇供給に対する反転出力に応動して受光信号を信号処
理回路に入力せしめることができるから、発光部と受光
部間に間歇パルスを送受する特別の信号線路を必要とせ
ず、発光部の間歇的発光に同期して受光信号を処理する
ことができ、且つ、電源線路の線路抵抗に影響されるこ
となく光源を所定の輝度で発光させるこ5とができる効
果がある。Furthermore, when used in an infrared intrusion detector, the influence of disturbance light incident from sources other than the light source can be removed, and intrusion detection can be performed with high precision as described above. Note that, in addition to causing the light source to emit light intermittently, as in the above embodiment, the light source is modulated by the output of the oscillation circuit to cause it to emit light intermittently and intermittently at a specific frequency, which increases the influence of ambient light. It is more effective in places. As explained above, by having the above configuration, the present invention charges the power source intermittently supplied from the light receiving section side in the light emitting section, and causes the light source to emit light intermittently using the discharging current when the power is not supplied. At the same time, the light reception signal can be input to the signal processing circuit in response to the inverted output with respect to the intermittent supply of the power supply, so there is no need for a special signal line for transmitting and receiving intermittent pulses between the light emitting part and the light receiving part. The light receiving signal can be processed in synchronization with the intermittent light emission of the light emitting section, and the light source can emit light at a predetermined brightness without being affected by the line resistance of the power supply line.
第1図は本発明の一実施例を示すプロツク図、第2図は
上記実施例の発光部の具体例を示す回路図、第3図は本
発明の動作状態を示す動作線図である。
1・・・・・・電源供給判別回路、2・・・・・・充電
回路、3・・・・・・発振回路、4・・・・・・光源駆
動回路、5・・・・・・光源、6・・・・・・光電変換
回路、9・・・・・・信号処理回路、10・・・・・・
間歇電源供給回路、13・・・・・・受光信号スイツチ
ング回路、14・・・・・・電源線路。FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of the light emitting section of the above embodiment, and FIG. 3 is an operation diagram showing the operating state of the present invention. 1...Power supply determination circuit, 2...Charging circuit, 3...Oscillation circuit, 4...Light source drive circuit, 5...... Light source, 6...Photoelectric conversion circuit, 9...Signal processing circuit, 10...
Intermittent power supply circuit, 13... Light receiving signal switching circuit, 14... Power supply line.
Claims (1)
受光部とを分離して設置し、発光部からの光線の遮断又
は減衰による透過光量の変化を受光部において検出する
光電式検出器において、上記発光部に、受光部側からの
電源供給の有無を検出して電源非供給時に制御信号を出
力する電源供給判別回路と、電源供給時に充電し、非供
給時に放電する充電回路と、電源非供給時に上記電源供
給判別回路からの制御信号が入力し、それに基づいて上
記充電回路を放電させてその放電電流により光源を発光
させる光源駆動回路とを備え、且つ、上記受光部に、上
記発光部へ電源を間歇的に供給すると共に、該電源の間
歇供給に対する反転出力を発生する間歇電源供給回路と
、該間歇電源供給回路の反転出力に応動して受光信号を
信号処理回路に入力せしめる受光信号スイッチング回路
とを備えることを特徴とする光電式検出器。1. A photoelectric detector in which a light-emitting part having a light source and a light-receiving part that detects light from the light-emitting part are installed separately, and the light-receiving part detects changes in the amount of transmitted light due to blocking or attenuation of the light beam from the light-emitting part. In the light emitting unit, a power supply determination circuit detects whether or not power is supplied from the light receiving unit side and outputs a control signal when power is not supplied; and a charging circuit that charges when power is supplied and discharges when power is not supplied; a light source drive circuit that receives a control signal from the power supply determination circuit when power is not supplied, discharges the charging circuit based on the control signal, and causes the light source to emit light using the discharge current; an intermittent power supply circuit that intermittently supplies power to the light emitting section and generates an inverted output in response to the intermittent supply of the power; and a light reception signal is input to the signal processing circuit in response to the inverted output of the intermittent power supply circuit. A photoelectric detector comprising a light receiving signal switching circuit.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8009579A JPS5932838B2 (en) | 1979-06-27 | 1979-06-27 | photoelectric detector |
AU59412/80A AU533232B2 (en) | 1979-06-27 | 1980-06-19 | Photoelectric detector |
GB8020207A GB2057121B (en) | 1979-06-27 | 1980-06-20 | Photoelectric detection apparatus |
DE3023784A DE3023784C2 (en) | 1979-06-27 | 1980-06-25 | Photoelectric detector |
AT0336280A AT384903B (en) | 1979-06-27 | 1980-06-26 | PHOTOELECTRIC BARRIER |
US06/163,073 US4333724A (en) | 1979-06-27 | 1980-06-26 | Photoelectric detector |
FR8014404A FR2460012A1 (en) | 1979-06-27 | 1980-06-27 | PHOTOELECTRIC DETECTOR |
CH494880A CH637779A5 (en) | 1979-06-27 | 1980-06-27 | PHOTOELECTRIC DETECTOR. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8009579A JPS5932838B2 (en) | 1979-06-27 | 1979-06-27 | photoelectric detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS566144A JPS566144A (en) | 1981-01-22 |
JPS5932838B2 true JPS5932838B2 (en) | 1984-08-11 |
Family
ID=13708628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8009579A Expired JPS5932838B2 (en) | 1979-06-27 | 1979-06-27 | photoelectric detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5932838B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60106151U (en) * | 1983-12-23 | 1985-07-19 | 松下電工株式会社 | Dimming smoke detector |
-
1979
- 1979-06-27 JP JP8009579A patent/JPS5932838B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS566144A (en) | 1981-01-22 |
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