JPS5866879A - Reflection type photoelectric switch - Google Patents

Reflection type photoelectric switch

Info

Publication number
JPS5866879A
JPS5866879A JP56166101A JP16610181A JPS5866879A JP S5866879 A JPS5866879 A JP S5866879A JP 56166101 A JP56166101 A JP 56166101A JP 16610181 A JP16610181 A JP 16610181A JP S5866879 A JPS5866879 A JP S5866879A
Authority
JP
Japan
Prior art keywords
light
photoelectric switch
receiver
photodetector
photodetecting
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
Application number
JP56166101A
Other languages
Japanese (ja)
Inventor
Ryota Miyake
三宅 梁太
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TAKENAKA ENG KOGYO KK
Takenaka Engineering Co Ltd
Original Assignee
TAKENAKA ENG KOGYO KK
Takenaka Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TAKENAKA ENG KOGYO KK, Takenaka Engineering Co Ltd filed Critical TAKENAKA ENG KOGYO KK
Priority to JP56166101A priority Critical patent/JPS5866879A/en
Publication of JPS5866879A publication Critical patent/JPS5866879A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04Systems determining the presence of a target

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Burglar Alarm Systems (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To elevate an S/N ratio in the photodetecting side, and to widen a detecting range, by using plural light emitting elements, and giving a difference to light emission of the light emitting element so that a photodetecting state of a photodetector becomes a differential type. CONSTITUTION:Lenses 3, 3' of a projector 1 and a photodetector 2 are turned to a wall surface 4, respectively, and the photodetector 2 is fitted to such a position as receives both modulated light P1, P2. In this case, the modulated light P1 and P2 which a photodetector R1 receives are adjusted so that the intensity becomes same, but in case when it does not become equal by only adjusting the direction, the degree of light emission of a light emitting element D1 or D2 is adjusted. Only when the photodetecting intensity is same, an output of the element R1becomes a DC portion only. In case when it is set as a stationary state, when a substance to be inspected enters into the beam of light of the modulated light P1 or P2, photodetecting balance of each modulated light P1, P2 which the element R1 receives gives way, and from the element R1, an AC portion is outputted. Accordingly, by detecting these DC and AC portions, a desired detecting output signal can be obtained.

Description

【発明の詳細な説明】 本発明は、投光器より発した光を物体で反射させ、この
反射光を受光器で受光し、この受光量の変化を検出して
信号を出す、主に侵入者検知として用いる反射型光電ス
イッチに関する。
Detailed Description of the Invention The present invention is mainly used for intruder detection, in which light emitted from a projector is reflected by an object, this reflected light is received by a receiver, and a signal is issued by detecting a change in the amount of received light. This invention relates to a reflective photoelectric switch used as a reflective photoelectric switch.

従来の反射型光電スイッチとしては、投光器と受光器を
一つの容器内に納めた一体形が一般で、反射鏡を用いな
いものでは検知距離が短かく、また反射鏡を用いるもの
では検知距離はのびるけれども、反射率が大きい被検知
物体はこれを確実に検知しないといった欠点があり、さ
らに両者ともその構造上検知範囲が狭く、受光量の変化
は微分検出形であるから、被検知物体が停止状態を継続
の場合は、検出信号を出力しなくなり、侵入者検知に用
いるには難があった。
Conventional reflective photoelectric switches are generally integrated, with the emitter and receiver housed in one container. Those that do not use a reflector have a short detection distance, and those that do use a reflector have a short detection distance. However, they have the disadvantage that objects with high reflectance cannot be detected reliably.Furthermore, both have narrow detection ranges due to their structure, and changes in the amount of light received are of the differential detection type, so it is difficult for objects to be detected to stop. If the state continues, the detection signal will no longer be output, making it difficult to use it for intruder detection.

本発明は、上記従来の諸欠点を解消したもので、検知範
囲が広く、被検知物体をその移動速度に関係なく確実に
検知する反射型光電スイッチの提供を目的をし、以下に
詳述する。
The present invention solves the above-mentioned conventional drawbacks, and aims to provide a reflective photoelectric switch that has a wide detection range and can reliably detect an object to be detected regardless of its moving speed, and is described in detail below. .

第1図は本発明の基本形を示し、投光器1の光学系とし
ては凸レンズ3を用い、その焦点もしくは焦点の近くに
は発光源として二つの発光素+DI。
FIG. 1 shows the basic form of the present invention, in which a convex lens 3 is used as the optical system of the projector 1, and two light emitting elements +DI are used as light sources at or near the focus.

D2が配置之れ、各発光素+DI、D2は第3図(イX
O)に示すように互いに逆位相の変調光PI、P2(赤
外線パルス光)を発するようにしである。また受光器2
の光学系にも凸レンズ3′を用い、その焦点もしくは焦
点の近くに受光素子R1が配回されている。
D2 is arranged, each light emitting element + DI, D2 is
As shown in O), modulated lights PI and P2 (infrared pulsed lights) having mutually opposite phases are emitted. Also, receiver 2
A convex lens 3' is also used in the optical system, and a light receiving element R1 is arranged at or near the focal point of the convex lens 3'.

投光器1と受光器2のレンズ3.3′はそれぞれ壁面4
に向けられ、受光器2は壁面4で反射された前記両度調
光P1.P2を受けるような位置に取り付けられている
。この場合受光素子R1が受ける一方の変調先回と他方
の変調光P2の強さくパルス高さ)は同じとなるよデに
投光器1あるいは受光器2の方向を調整するが、当該方
向調整のみでは各変調光PI、P2の受光強度が等しく
ならない場合は、発光素子D1あるいは同D2の発光度
を調整するようにする。受光素子R1が受ける各変調先
回、P2の受光強度が同じのとき受光素子R1の出力は
第3図(ハ)に示すように直流分のみとなる。これを定
常状態とすれば、変調先回あるいは同P2の光芒内に被
検知物体(侵入者等)が入ると、受光素子R1が受ける
各変調光PI、P2の受光バランスが崩れ、受光素子R
1からは交流会が出力される。従って受光索子R1の後
段に直流と交流とを判別する電気口:18(図示省略)
 を接続すれば、所望の出力信号が得られる。
The lenses 3 and 3' of the emitter 1 and the receiver 2 are connected to the wall surface 4, respectively.
The light receiver 2 receives the two-way dimming signal P1. reflected from the wall surface 4. It is attached at a position to receive P2. In this case, the direction of the emitter 1 or the receiver 2 is adjusted so that the intensity and pulse height of one modulated light received by the light receiving element R1 is the same as that of the other modulated light P2, but it is not possible to adjust the direction alone. If the received light intensities of the modulated lights PI and P2 are not equal, the luminous intensity of the light emitting element D1 or D2 is adjusted. When the received light intensity of P2 is the same each time the light receiving element R1 receives the modulation, the output of the light receiving element R1 becomes only the DC component as shown in FIG. 3(C). If this is a steady state, if a detected object (such as an intruder) enters the beam of the previous modulation or P2, the reception balance of each modulated light PI and P2 received by the light receiving element R1 will be disrupted, and the light receiving element R1 will
From 1, the exchange meeting is output. Therefore, an electric port for distinguishing between direct current and alternating current is provided after the light receiving cable R1: 18 (not shown)
By connecting , the desired output signal can be obtained.

上記とは逆に定常状態では、受光素子R1が受ける各変
調先回、 R2の受光強度に差を設けでおき、被検知物
体が変調光P!あるいは同P2の光芒内に入ったとき、
前記受光強度が同じになるようにしでも良い。この場合
受光素子R1からの出力は第3図(ニ)から(ハ)とな
る。
Contrary to the above, in a steady state, a difference is set in the received light intensity of R2 before each modulation received by the light receiving element R1, and the detected object receives the modulated light P! Or when you enter the beam of light on P2,
The received light intensity may be the same. In this case, the output from the light receiving element R1 becomes as shown in FIGS. 3(d) to (c).

また、発光素子DI、D2の発光波長を異ならせておい
ても同じようなことが言える。この場合には、受光素子
R1が異なった波長の光を同時に受けると受光素子R1
から出力電流が流れ、いずれか一方の波長の光が遮光さ
れる上受光索子R1から出力電流が流れなくなるので、
これにより所望の出力が得られる。
Moreover, the same thing can be said even if the light emission wavelengths of the light emitting elements DI and D2 are made different. In this case, if the light receiving element R1 receives light of different wavelengths at the same time, the light receiving element R1
Since the output current flows from the upper light receiving element R1 where the light of one of the wavelengths is blocked, the output current no longer flows from the upper light receiving element R1.
This provides the desired output.

第2図では投光器1および受光器2の光学系を複数の凹
面鏡5.5′(曲面鏡、放物面鏡等)としたもので、各
光軸XI、X2・・・・・・、X1lX2・・・・・・
は異方向を向いており、受光器2の光学系5′の焦点も
しくは焦点の近くには二つの受光素子R1,R2を配置
し、各発光素子DI+D2に対応してそれぞれ受光する
ようにしである。この場合には、どちらの受光素子R1
,R2が先に遮光されたかによって被検知物体の移動方
向を検出することができると共に、各受光素子R1,R
2からの出力を増幅して両者のバランスを受光側で取る
こともできる。
In Fig. 2, the optical system of the emitter 1 and the receiver 2 is composed of a plurality of concave mirrors 5.5' (curved mirrors, parabolic mirrors, etc.), and each optical axis XI, X2..., X1lX2・・・・・・
are facing in different directions, and two light receiving elements R1 and R2 are arranged at or near the focal point of the optical system 5' of the light receiver 2, so as to receive light corresponding to each light emitting element DI+D2. . In this case, which light receiving element R1
, R2 is blocked first, the moving direction of the object to be detected can be detected.
It is also possible to amplify the output from 2 and balance the two on the light receiving side.

尚、上記ではそれぞれ二つの発光素子、受光素子で説明
したが、これに限定されず、各素子を3・やしても四哩
同用である。
Although the above description has been made using two light-emitting elements and two light-receiving elements, the present invention is not limited to this, and even if each element has three or four elements, the same effect can be achieved.

以上の如く、本発明では発光素子に複数個を用い、受光
索子の受光状態が差動型となるように各発光素子の発光
に差を持たせたので、受光側でのSNhヒが向上し、検
知距離を長くとることができるとともに、投・受光器の
それぞれの光軸も異方向に複数を取ることができ、検知
範囲を広くし得る。ざらに被検知物体が検知範囲に停止
したままでは、受光のバランスが当初と異なるので検出
信号は継続して出力される特徴を有する。
As described above, in the present invention, a plurality of light emitting elements are used, and the light emission of each light emitting element is made different so that the light receiving state of the light receiving cable is a differential type, so that the SNh on the light receiving side is improved. However, the detection distance can be increased, and the optical axes of the projector and receiver can be set in a plurality of directions in different directions, making it possible to widen the detection range. Roughly speaking, if the object to be detected remains stopped within the detection range, the balance of light reception is different from the initial one, so the detection signal has the characteristic of being continuously output.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係る光電スイッチのふかん図、第2図
は他の実施例による同ふかん図、第3図は動作説明を示
す波形図である。 1・・・・・・投光器。2・・・・・・受光器。3・・
・・・・光学系。4・・・・・・壁面。DI−、D2・
・・・・・発光素子。R1,R2・・・・・・受光素子 特許出願人
FIG. 1 is a diagram of the photoelectric switch according to the present invention, FIG. 2 is a diagram of the same according to another embodiment, and FIG. 3 is a waveform diagram showing an explanation of the operation. 1... Floodlight. 2... Light receiver. 3...
····Optical system. 4...Wall surface. DI-, D2・
...Light emitting element. R1, R2... Light receiving element patent applicant

Claims (1)

【特許請求の範囲】 1)投光器より発した光を物体で反射させ、この反射光
を受光器で受光し、この受光量の変化を検出して信号を
出す反射型光電スイッチにおいて、投光器の光学系の焦
点もしくは焦点の近くには、互いに逆位相の変調光を発
する複数の発光素子を配置したことを特徴とする反射型
光電スイ・ンチ。 2)投光器より発した光を物体で反射させ、この反射光
を受光器で受光し、この受光量の変化を検出して信号を
出す反射型光電スイッチにおいて、投光器の光学系の焦
点もしくは焦点の近くには、それぞれ興なった波畏の光
を発する複数の発光素子を配置したこ七を特徴とする反
射型光電スイッチ。 3)投光器および/または受光器の光学系は、光軸を複
数の異方向とした特許請求の範囲第1項または同第2項
記載の反射型光電スイッチ。 4)受光器の光学系の焦点もしくは焦点の近くには、複
数の受光素子を配置したことを特徴とする反射型光電ス
イ・ンチ。
[Claims] 1) A reflective photoelectric switch in which light emitted from a projector is reflected by an object, the reflected light is received by a receiver, and a change in the amount of received light is detected and a signal is output. A reflective photoelectric switch characterized in that a plurality of light emitting elements that emit modulated light of mutually opposite phases are arranged at or near the focal point of the system. 2) In a reflective photoelectric switch, the light emitted from the projector is reflected by an object, the reflected light is received by the receiver, and a change in the amount of received light is detected and a signal is output. Nearby is a reflective photoelectric switch featuring several light-emitting elements, each of which emits the light of a rising wave. 3) A reflective photoelectric switch according to claim 1 or 2, wherein the optical system of the projector and/or receiver has optical axes in a plurality of different directions. 4) A reflective photoelectric switch characterized in that a plurality of light receiving elements are arranged at or near the focal point of the optical system of the light receiver.
JP56166101A 1981-10-16 1981-10-16 Reflection type photoelectric switch Pending JPS5866879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56166101A JPS5866879A (en) 1981-10-16 1981-10-16 Reflection type photoelectric switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56166101A JPS5866879A (en) 1981-10-16 1981-10-16 Reflection type photoelectric switch

Publications (1)

Publication Number Publication Date
JPS5866879A true JPS5866879A (en) 1983-04-21

Family

ID=15825024

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56166101A Pending JPS5866879A (en) 1981-10-16 1981-10-16 Reflection type photoelectric switch

Country Status (1)

Country Link
JP (1) JPS5866879A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108886U (en) * 1985-12-26 1987-07-11
JPS62199686U (en) * 1986-06-09 1987-12-19
JPH01313787A (en) * 1988-06-14 1989-12-19 Stanley Electric Co Ltd Optical detecting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5246850B1 (en) * 1971-05-29 1977-11-28
JPS5430056A (en) * 1977-08-11 1979-03-06 Koito Kogyo Kk Photoelectric detector
JPS5434856A (en) * 1977-08-24 1979-03-14 Koito Kogyo Kk Device for detecting objects
JPS5734476A (en) * 1980-08-12 1982-02-24 Koito Ind Co Ltd Photoelectric type body sensing system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5246850B1 (en) * 1971-05-29 1977-11-28
JPS5430056A (en) * 1977-08-11 1979-03-06 Koito Kogyo Kk Photoelectric detector
JPS5434856A (en) * 1977-08-24 1979-03-14 Koito Kogyo Kk Device for detecting objects
JPS5734476A (en) * 1980-08-12 1982-02-24 Koito Ind Co Ltd Photoelectric type body sensing system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108886U (en) * 1985-12-26 1987-07-11
JPH0452698Y2 (en) * 1985-12-26 1992-12-10
JPS62199686U (en) * 1986-06-09 1987-12-19
JPH01313787A (en) * 1988-06-14 1989-12-19 Stanley Electric Co Ltd Optical detecting device
JPH0555823B2 (en) * 1988-06-14 1993-08-18 Stanley Electric Co Ltd

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