JP2005227121A - Countermeasures for preventing mutual interference in photoelectric switch - Google Patents

Countermeasures for preventing mutual interference in photoelectric switch Download PDF

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JP2005227121A
JP2005227121A JP2004035984A JP2004035984A JP2005227121A JP 2005227121 A JP2005227121 A JP 2005227121A JP 2004035984 A JP2004035984 A JP 2004035984A JP 2004035984 A JP2004035984 A JP 2004035984A JP 2005227121 A JP2005227121 A JP 2005227121A
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light
photoelectric sensor
wavelength band
receiving
light receiving
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Yoshikazu Mashima
義和 真嶋
Yasumasa Sakai
泰誠 酒井
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Omron Corp
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Omron Tateisi Electronics Co
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric sensor system for surely preventing mutual interference, when adjacently arranging a photoelectric sensor, using a simple constitution. <P>SOLUTION: A photoelectric switch comprises a first transmission type photoelectric sensor, having a light source and a light-receiving unit, and a second one having the light source and the light-receiving unit. The light source of the first transmission type photoelectric sensor is composed so that it projects light that contains a first light wavelength region component and does not contain a second light wavelength region component, and the light-receiving unit of the first transmission type photoelectric sensor has a light-receiving wavelength region selection means for receiving light that contains a first light wavelength region component and does not contain the second light wavelength region component. The light source of the second transmission-type photoelectric sensor is composed so that it projects light that contains the second light wavelength region component and does not contain the first light wavelength region component, and the light-receiving unit of the second light-transmission type photoelectric sensor has a light-receiving wavelength region selecting means for receiving the light that contains the second light wavelength region component and does not contain the first light wavelength region component. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、光電センサを複数隣接させて配列する光電センサシステムに係り、特に、各光電センサが隣接する光電センサ同士の相互干渉を防止するような構成を有する光電センサシステムに関する。   The present invention relates to a photoelectric sensor system in which a plurality of photoelectric sensors are arranged adjacent to each other, and more particularly to a photoelectric sensor system having a configuration in which each photoelectric sensor prevents mutual interference between adjacent photoelectric sensors.

当業者にはよく知られているように、この種の光電センサには透過型と反射型とがあり、透過型の場合には、投光素子及び投光レンズを主体として構成される投光器と、受光素子及び受光レンズを主体として構成される受光器とを有する。そして、投光器の投光素子より投光される光を受光器の受光素子にて受光し、その受光の有無や受光量等によって投光器と受光器との間に発生する光の通過経路における物体の位置や存在の有無等を検知するものである。透過型光電センサにおいては、投光器と受光器とはそれぞれ別体として構成され、計測対象領域を挟んだ対象位置に互いに向き合うように配置される。これに対して、反射型光電センサの場合には、投光素子及び投光レンズを主体として構成される投光部と受光素子及び受光レンズを主体として構成される受光部とを有し、投光部と受光部とは、計測対処領域に対して同じ側に配置され、単一のケース内に収納されるようにしても良い。そして、投光部の投光素子から投光される光は計測対象物体の表面に反射して受光部の受光素子において受光し、その受光の有無や受光量等によって計測対象物体の存在の有無や反射率等を検知するものである。また、計測対象物体の背後に回帰反射板を配置して、計測対象物体の表面からの反射光の受光量と、計測対象物体が存在しない場合の反射板からの受光量とを検知して比較することにより、計測対象物体の存在の有無を検知する回帰反射型光電センサも知られている。   As is well known to those skilled in the art, this type of photoelectric sensor includes a transmissive type and a reflective type, and in the case of the transmissive type, a projector composed mainly of a light projecting element and a light projecting lens; And a light receiver mainly composed of a light receiving element and a light receiving lens. Then, the light projected from the light projecting element of the light projector is received by the light receiving element of the light receiver, and the object in the passage path of the light generated between the light projector and the light receiver depending on the presence / absence of the light reception or the amount of light received. It detects the position, presence / absence, and the like. In the transmissive photoelectric sensor, the projector and the light receiver are configured as separate bodies, and are arranged so as to face each other at a target position across the measurement target region. On the other hand, the reflection type photoelectric sensor has a light projecting unit mainly composed of a light projecting element and a light projecting lens and a light receiving unit composed mainly of a light receiving element and a light receiving lens. The light part and the light receiving part may be arranged on the same side with respect to the measurement coping area and housed in a single case. The light projected from the light projecting element of the light projecting part is reflected on the surface of the object to be measured and received by the light receiving element of the light receiving part. And reflectivity. In addition, a return reflector is placed behind the measurement target object to detect and compare the amount of light reflected from the surface of the measurement target object and the amount of light received from the reflection plate when there is no measurement target object. A regressive reflection type photoelectric sensor that detects the presence / absence of an object to be measured is also known.

これらの光電センサを複数隣接させて配置させる光電センサシステムも知られているが、この種の光電センサシステムにおいて、投光素子としてＬＥＤ（発光ダイオード）を使用すると、投光される光の投光幅の広さに起因して、投光を行う投光器と一対一に対応付けられている受光器のみではなく、隣接する他の受光器も投光領域に含んでしまい、他の受光器においても受光が行われてしまうという隣接する光電センサ同士の相互干渉が問題となっていた。   A photoelectric sensor system in which a plurality of these photoelectric sensors are arranged adjacent to each other is also known. In this type of photoelectric sensor system, when an LED (light emitting diode) is used as a light projecting element, light projection is performed. Due to the wide width, not only the one-to-one correspondence with the projector that performs the projection, but also the other adjacent receivers are included in the projection area, and in other receivers as well There has been a problem of mutual interference between adjacent photoelectric sensors that light is received.

従来より、このような相互干渉を防ぐために様々な対策が試みられている。図９及び１０にて従来の相互干渉防止対策の説明図が示されている。これらの図において、１ａ、１ｂは投光器、２ａ、２ｂは受光器、３ａ、３ｂは偏向フィルタ、４は投光される光、５は信号線、そして６は同期光をそれぞれ示している。尚、これらの図においては、透過型光電センサを２組隣接させて配置した例が示されている。   Conventionally, various measures have been tried to prevent such mutual interference. 9 and 10 are explanatory diagrams of conventional measures for preventing mutual interference. In these drawings, 1a and 1b are projectors, 2a and 2b are light receivers, 3a and 3b are deflection filters, 4 is light to be projected, 5 is a signal line, and 6 is sync light. In these drawings, an example is shown in which two sets of transmissive photoelectric sensors are arranged adjacent to each other.

図９（ａ）にて示されるように、２組の透過型光電センサを配列する際に、投光器と受光器とを交互に配列するちどり配置方式が知られている。このちどり配置方式を採用することによって、投光器１ａから投光される光の投光領域４−４が、対となっている受光器２ａとその隣接他機とを含んでしまう状態においても、受光器２ａに隣接しているのは投光器１ｂなので、受光器２ａのみで受光が行われるものである。同様に、投光器１ｂから投光される光は、受光器２ｂと投光器１ａとをその投光領域に含むものの、受光器２ｂのみで受光が行われる。   As shown in FIG. 9A, there is known a dust arrangement method in which a light projector and a light receiver are alternately arranged when arranging two sets of transmissive photoelectric sensors. By adopting this dust arrangement method, even in a state where the light projecting area 4-4 of the light projected from the projector 1a includes the paired light receiver 2a and the adjacent other device. Since the light projector 1b is adjacent to the light receiver 2a, light is received only by the light receiver 2a. Similarly, the light projected from the light projector 1b includes the light receiver 2b and the light projector 1a in its light projection area, but is received only by the light receiver 2b.

このちどり配置方式にあっては、光の投光領域４−４の幅にもよるが、通常のＬＥＤを使用すると光に広がりを持たせないようにできないため、２組の透過型光電センサを隣接配置する際には相互干渉を防止することができるが、３組以上の隣接配置に対しては対応できないという問題点がある。また、投光器と受光器とを交互に配列するため、設置に係る工数が増加してしまい手間がかかる、などの問題点が指摘されている。   In this dust arrangement method, although depending on the width of the light projection area 4-4, if a normal LED is used, it is impossible to prevent the light from spreading, so two sets of transmission type photoelectric sensors are provided. Mutual interference can be prevented when adjacently arranged, but there is a problem that it is not possible to cope with three or more sets of adjacently arranged. In addition, it has been pointed out that the projector and the light receiver are alternately arranged, which increases the number of man-hours for installation and takes time.

また、図９（ｂ）にて示されるように、例えば、対となる投光器１ａと受光器２ａの前面にそれぞれ横方向に配置された偏向フィルタ３ａを、そして隣接配置されるもう一方の投光器１ｂと受光器１ｂの前面にはそれぞれ縦方向に配置された偏向フィルタ３ｂを設置する偏向フィルタ方式も知られている（特許文献１参照）。この偏向フィルタによって、例えば、横方向の偏向フィルタ３ａを介して投光器１ａから投光される光は、同じく横方向の偏向フィルタ３ａが前面に設けられている受光器２ａによってのみ受光が行われるようにしたものである。同様に、縦方向の偏向フィルタ３ｂを介して投光器１ｂから投光される光は、縦方向の偏向フィルタ３ｂが前面に設けられている受光器２ｂによってのみ受光される。   Further, as shown in FIG. 9B, for example, a pair of a projector 1a and a deflecting filter 3a disposed in the lateral direction on the front surface of the light receiver 2a are arranged, and the other projector 1b arranged adjacently. There is also known a deflection filter system in which deflection filters 3b arranged in the vertical direction are installed on the front surface of the light receiver 1b (see Patent Document 1). With this deflection filter, for example, the light projected from the projector 1a via the lateral deflection filter 3a is received only by the optical receiver 2a provided with the lateral deflection filter 3a on the front surface. It is a thing. Similarly, the light projected from the projector 1b via the vertical deflection filter 3b is received only by the light receiver 2b provided with the vertical deflection filter 3b on the front surface.

しかし、この偏向フィルタ方式においても、上記ちどり配置方式と同様に、３組以上の透過型光電センサの隣接配置には対応できないことに加え、部品点数の増加によるコストアップや設置工数の増加が生じてしまう。   However, in this deflection filter method, as well as the above-described dusty arrangement method, in addition to being able to cope with the adjacent arrangement of three or more pairs of transmissive photoelectric sensors, an increase in the number of parts and an increase in installation man-hours occur. End up.

また、図９（ｃ）にて示されるように、対となる投光器１ａと受光器２ｂ、及び投光器１ｂと受光器２ｂ、とをそれぞれ信号線５で接続して電気的に同期を取り、隣接他機との投光及び受光タイミングをずらすことによって対象となる受光器のみによって受光されるようにした電気的同期方式も知られている。   Further, as shown in FIG. 9 (c), the projector 1a and the light receiver 2b and the light projector 1b and the light receiver 2b, which are paired, are connected to each other by the signal line 5 to be electrically synchronized and adjacent to each other. There is also known an electrical synchronization system in which light is received by only a target light receiver by shifting the light projection and light reception timing with another device.

しかし、このような電気的同期方式においては、投光器１ａと受光器２ａ（及び投光器１ｂと受光器２ｂ）とを信号線５によって個々に接続する必要が生じるため配線工数がかかってしまう。また、投光器と受光器間の検出距離が長くなると、配線の引き回しも同様に長くなるため、さらに手間がかかってしまう。   However, in such an electrical synchronization method, it is necessary to individually connect the light projector 1a and the light receiver 2a (and the light projector 1b and the light receiver 2b) through the signal line 5, so that the wiring man-hour is required. In addition, when the detection distance between the projector and the light receiver is increased, the wiring is also increased in the same manner.

また、図１０（ａ）にて示されるように、対となる投光器１ａと受光器２ａにおいて、受光素子と投光素子とを別途設け、検出用の光とは別に同期用の光６を投受光することにより光学的に同期を取り、隣接他機との投光及び受光タイミングをずらすことによって対象となる受光器のみによって受光されるようにした光学的同期方式も知られている。   Further, as shown in FIG. 10A, in the pair of projector 1a and receiver 2a, a light receiving element and a light projecting element are provided separately, and a synchronizing light 6 is projected separately from the detection light. There is also known an optical synchronization method in which optical synchronization is achieved by receiving light, and light is received by only a target light receiver by shifting light projection and light reception timing with adjacent other devices.

しかし、この光学的同期方式においては、それぞれの投光器及び受光器において、検出用の投光素子及び受光素子に加え、同期用の投光素子及び受光素子が別途必要となり、かつ処理回路も必要となるため大幅なコストアップが生じてしまう。更に、部品点数の大幅な増加により装置の大型化が否めない。   However, in this optical synchronization method, in addition to the light projecting element and the light receiving element for detection, a light projecting element and a light receiving element for synchronization are separately required in each light projector and light receiver, and a processing circuit is also required. Therefore, a significant cost increase occurs. Furthermore, the increase in the number of parts inevitably increases the size of the apparatus.

また、図１０（ｂ）にて示されるように、広がりを持たない光（レーザ等）を利用して、対象となる受光器以外を投光領域４−４内に含まないように構成し、隣接他機に影響を与えないようにした光線細径化方式も知られている。   Further, as shown in FIG. 10 (b), by using light (laser or the like) that does not spread, it is configured not to include other than the target light receiver in the light projecting region 4-4, There is also known a light beam thinning method that does not affect adjacent other devices.

しかし、この光線細径化方式においては、ＬＥＤでは広がりを持たないようにできないため、レーザ等を使用することとなり、コストが増加してしまう。また、レーザ光線の幅が狭いことに起因して、受光器２ａが投光器１ａからのレーザ光線の照射領域に含まれるように、それぞれの設置位置をより厳密に設定しなくてはならなくなる。さらに、計測対象領域をワークが通過する際に、ワークの端面に反射して誤作動してしまう可能性が生じてしまう。
特開平１−８８４３７号公報 However, in this beam thinning method, since the LED cannot be spread, a laser or the like is used, and the cost increases. In addition, due to the narrow width of the laser beam, each installation position has to be set more strictly so that the light receiver 2a is included in the irradiation region of the laser beam from the projector 1a. Further, when the workpiece passes through the measurement target area, there is a possibility that the workpiece is reflected on the end surface of the workpiece and malfunctions.
JP-A-1-88437

この発明は、このような従来の問題点に着目してなされたものであり、その目的とするところは、光電センサを隣接配置する際の相互干渉を確実に、かつ簡易な構成で防ぐことが可能な光電センサシステムを提供することにある。   The present invention has been made paying attention to such conventional problems, and the object of the present invention is to reliably prevent mutual interference when the photoelectric sensors are arranged adjacently with a simple configuration. It is to provide a possible photoelectric sensor system.

この発明の他の目的並びに作用効果については、明細書の以下の記述を参照することにより、当業者であれば容易に理解されるであろう。   Other objects and operational effects of the present invention will be easily understood by those skilled in the art by referring to the following description of the specification.

この発明の透過型光電センサシステムは、投光器と受光器とを有する第１の透過型光電センサと、投光器と受光器とを有する第２の透過型光電センサとを含むものである。第１の透過型光電センサの投光器は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を投光するように構成され、かつ第１の透過型光電センサの受光器は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、第２の透過型光電センサの投光器は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を投光するように構成され、かつ第２の透過型光電センサの受光器は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を受光するために受光波長域選択手段を具備するものである。   The transmission photoelectric sensor system of the present invention includes a first transmission photoelectric sensor having a projector and a light receiver, and a second transmission photoelectric sensor having a projector and a light receiver. The projector of the first transmissive photoelectric sensor is configured to project light including the first light wavelength band component and not including the second light wavelength band component, and the first transmissive photoelectric sensor of the first transmissive photoelectric sensor. The light receiver includes a light receiving wavelength range selecting means for receiving light including the first light wavelength band component and not including the second light wavelength band component, and the projector of the second transmission type photoelectric sensor includes: The second transmissive photoelectric sensor is configured to project light including the second optical wavelength band component and not including the first optical wavelength band component, and the second transmissive photoelectric sensor includes a second optical wavelength band component. And receiving light that does not contain the first light wavelength band component. The light receiving wavelength band selection means is provided.

このような構成によれば、第１及び第２の、合計２組の透過型光電センサを隣接して設置するような場合においても、それぞれの受光器は対となっている投光器から投光される光のみを光波長域成分に基づき選択的に受光し、それ以外の光は受光しないように構成されているため、隣接する透過型光電センサ同士の相互干渉を確実に防ぐことが可能となる。   According to such a configuration, even when a total of two sets of first and second sets of transmissive photoelectric sensors are installed adjacent to each other, each light receiver is projected from the pair of projectors. Only light is selectively received based on the light wavelength region component, and other light is not received, so that mutual interference between adjacent transmission type photoelectric sensors can be surely prevented. .

本発明の好ましい実施の形態にあっては、投光器と受光器とを有する第１の透過型光電センサと、投光器と受光器とを有する第２の透過型光電センサと、投光器と受光器とを有する第３の透過型光電センサとを含むものである。第１の透過型光電センサの投光器は、第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を投光するように構成され、かつ第１の透過型光電センサの受光器は、第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する。第２の透過型光電センサの投光器は、第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を投光するように構成され、かつ第２の透過型光電センサの受光器は、第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する。第３の透過型光電センサの投光器は、第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を投光するように構成され、かつ第３の透過型光電センサの受光器は、第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備するものであります。   In a preferred embodiment of the present invention, a first transmission photoelectric sensor having a projector and a light receiver, a second transmission photoelectric sensor having a light projector and a light receiver, a light projector and a light receiver are provided. And a third transmissive photoelectric sensor. The projector of the first transmission type photoelectric sensor is configured to project light including the first light wavelength band component and not including the second and third light wavelength band components, and the first transmission type The light receiver of the photoelectric sensor includes light receiving wavelength range selecting means for receiving light including the first light wavelength band component and not including the second and third light wavelength band components. The projector of the second transmission type photoelectric sensor is configured to project light including the second light wavelength band component and not including the first and third light wavelength band components, and the second transmission type The light receiver of the photoelectric sensor includes light reception wavelength range selection means for receiving light including the second light wavelength band component and not including the first and third light wavelength band components. The projector of the third transmission type photoelectric sensor is configured to project light including the third light wavelength band component and not including the first and second light wavelength band components, and the third transmission type. The light receiver of the photoelectric sensor is provided with light receiving wavelength range selection means for receiving light including the third light wavelength band component and not including the first and second light wavelength band components.

このような構成によれば、透過型光電センサを第１、第２、及び第３の合計３組を互いに隣接して配置するような場合においても、それぞれの受光器は対となっている投光器から投光される光のみを光波長域成分に基づき選択的に受光し、それ以外の光は受光しない構成とされているため、隣接する光電センサ同士の相互干渉を確実に防ぐことが可能となる。   According to such a configuration, even when a total of three sets of first, second, and third transmission photoelectric sensors are arranged adjacent to each other, each light receiver is a pair of projectors. Because it is configured to selectively receive only the light emitted from the light based on the light wavelength range component and not receive the other light, it is possible to reliably prevent mutual interference between adjacent photoelectric sensors Become.

本発明の好ましい実施の形態によれば、受光波長域選択手段が、それぞれ目的とする光波長域選択通過特性を有するように材質を選択された受光レンズである
。このような構成によれば、予め定められた光波長域成分を有する光のみを透過させる受光波長域選択手段が受光レンズそのものであるため、従来の透過型光電センサに比べて、部品点数を増やすことなく対応させることが可能であり、確実に隣接する光電センサ同士の相互干渉を防ぐことが可能となる。 According to a preferred embodiment of the present invention, the light receiving wavelength range selecting means is a light receiving lens whose material is selected so as to have a desired light wavelength range selective pass characteristic. According to such a configuration, since the light receiving wavelength range selecting means that transmits only light having a predetermined light wavelength range component is the light receiving lens itself, the number of components is increased as compared with the conventional transmission type photoelectric sensor. Therefore, it is possible to reliably prevent mutual interference between adjacent photoelectric sensors.

本発明の好ましい実施の形態によれば、受光波長域選択手段が、受光レンズと受光素子との間に介在され、かつ目的とする光波長域選択通過特性を有する光学フィルタである。このような構成によれば、光波長域選択通過特性を有する光学フィルタ（バンドパスフィルタ）は比較的安価に入手可能なので、さほどコストアップを招かずとも確実に隣接する光電センサ同士の相互干渉を防ぐことが可能となる。   According to a preferred embodiment of the present invention, the light receiving wavelength range selecting means is an optical filter that is interposed between the light receiving lens and the light receiving element and has a desired light wavelength range selective pass characteristic. According to such a configuration, an optical filter (band-pass filter) having a light wavelength range selective transmission characteristic can be obtained at a relatively low cost, so that mutual interference between adjacent photoelectric sensors can be reliably performed without incurring much cost increase. It becomes possible to prevent.

本発明の好ましい実施の形態によれば、各投光器内には、それぞれ目的とする投光の光波長域特性に符合する発光波長特性を有する投光素子が内蔵されている。このような構成により、例えば、赤色ＬＥＤ、青色ＬＥＤ、緑色ＬＥＤなどの異なる発光波長特性を有する光源を投光素子として隣接する投光器にてそれぞれ使用することにより、受光素子側の受光波長域選択手段を対応する投光素子の発光波長のみを受光し、その他の発光波長を有する光は受光しないように構成することが可能となり、その結果、隣接する光電センサ同士の相互干渉を確実に防ぐことが可能となる。   According to a preferred embodiment of the present invention, each projector has a built-in light projecting element having a light emission wavelength characteristic that matches the light wavelength band characteristic of the target light projection. With such a configuration, for example, by using light sources having different emission wavelength characteristics such as red LEDs, blue LEDs, and green LEDs as light projecting elements in adjacent projectors, the light receiving wavelength region selecting means on the light receiving element side It is possible to receive only the emission wavelength of the corresponding light projecting element and not to receive light having other emission wavelengths, and as a result, it is possible to reliably prevent mutual interference between adjacent photoelectric sensors. It becomes possible.

本発明の好ましい実施の形態によれば、投光素子より投光される光が可視光線である。このような構成によれば、隣接する投光器において、それぞれ異なる発光波長（色）を有する投光素子を使用しても、外観上の見分けが可能となり、光電センサを設置する際に正確な配列が容易となる。   According to a preferred embodiment of the present invention, the light projected from the light projecting element is visible light. According to such a configuration, it is possible to distinguish in appearance even when using light projecting elements having different emission wavelengths (colors) in adjacent projectors, and an accurate arrangement is provided when installing a photoelectric sensor. It becomes easy.

本発明の好ましい実施の形態によれば、投光部と受光部とを有する第１の反射型光電センサと、投光部と受光部とを有する第２の反射型光電センサとを含む。
第１の反射型光電センサの投光部は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を投光するように構成され、かつ第１の反射型光電センサの受光部は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する。第２の反射型光電センサの投光部は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を投光するように構成され、かつ第２の反射型光電センサの受光部は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を受光するために受光波長域選択手段を具備するものである。 According to a preferred embodiment of the present invention, a first reflective photoelectric sensor having a light projecting unit and a light receiving unit, and a second reflective photoelectric sensor having a light projecting unit and a light receiving unit are included.
The light projecting unit of the first reflective photoelectric sensor is configured to project light including the first light wavelength band component and not including the second light wavelength band component, and the first reflective photoelectric sensor. The light receiving unit of the sensor includes a light receiving wavelength band selecting unit for receiving light including the first light wavelength band component and not including the second light wavelength band component. The light projecting unit of the second reflective photoelectric sensor is configured to project light including the second light wavelength region component and not including the first light wavelength region component, and the second reflective photoelectric sensor. The light receiving unit of the sensor includes light receiving wavelength range selecting means for receiving light including the second light wavelength band component and not including the first light wavelength band component.

このような構成によれば、第１及び第２の合計２台の反射型光電センサを隣接して設置するような場合においても、それぞれの受光部は対となっている投光部から投光され、対象物によって反射される光のみを光波長域成分に基づき選択的に受光し、それ以外の光は受光しない構成とされるため、隣接する反射型光電センサ同士の相互干渉を確実に防ぐことが可能となる。   According to such a configuration, even when a total of two first and second reflective photoelectric sensors are installed adjacent to each other, each light receiving unit projects light from a pair of light projecting units. In this configuration, only the light reflected by the object is selectively received based on the light wavelength band component, and the other light is not received, so that mutual interference between adjacent reflective photoelectric sensors is surely prevented. It becomes possible.

本発明の好ましい実施の形態によれば、投光部と受光部とを有する第１の反射型光電センサと、投光部と受光部とを有する第２の反射型光電センサと、投光部と受光部とを有する第３の反射型光電センサとを含む。第１の反射型光電センサの投光部は、第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を投光するように構成され、かつ第１の反射型光電センサの受光部は、第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する。第２の反射型光電センサの投光部は、第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を投光するように構成され、かつ第２の反射型光電センサの受光部は、第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する。第３の反射型光電センサの投光部は、第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を投光するように構成され、かつ第３の反射型光電センサの受光部は、第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備するものである。   According to a preferred embodiment of the present invention, a first reflective photoelectric sensor having a light projecting unit and a light receiving unit, a second reflective photoelectric sensor having a light projecting unit and a light receiving unit, and a light projecting unit And a third reflective photoelectric sensor having a light receiving portion. The light projecting unit of the first reflective photoelectric sensor is configured to project light including the first light wavelength band component and not including the second and third light wavelength band components, and the first The light receiving unit of the reflective photoelectric sensor includes a light receiving wavelength range selecting unit for receiving light including the first light wavelength band component and not including the second and third light wavelength band components. The light projecting unit of the second reflective photoelectric sensor is configured to project light including the second light wavelength band component and not including the first and third light wavelength band components, and the second The light receiving unit of the reflective photoelectric sensor includes a light receiving wavelength range selecting unit for receiving light including the second light wavelength band component and not including the first and third light wavelength band components. The light projecting unit of the third reflective photoelectric sensor is configured to project light including the third light wavelength band component and not including the first and second light wavelength band components, and the third The light receiving unit of the reflective photoelectric sensor includes a light receiving wavelength range selecting unit for receiving light including the third light wavelength band component and not including the first and second light wavelength band components.

このような構成によれば、反射型光電センサを第１、第２、及び第３の合計３台互いに隣接して配置するような場合においても、それぞれの受光器は対となっている投光器から投光され、対象物より反射される光のみを光波長域成分に基づき選択的に受光し、それ以外の光は受光しない構成とされるため、隣接する光電センサ同士の相互干渉を確実に防ぐことが可能となる。   According to such a configuration, even when the reflection type photoelectric sensors are arranged adjacent to each other in total, the first, second, and third units, the respective light receivers are separated from the pair of projectors. Only the light that is projected and reflected from the object is selectively received based on the light wavelength range component, and the other light is not received, so that mutual interference between adjacent photoelectric sensors is surely prevented. It becomes possible.

本発明の好ましい実施の形態によれば、受光波長域選択手段が、それぞれ目的とする光波長域選択通過特性を有するように材質を選択された受光レンズである。このような構成によれば、予め指定された光波長域成分を有する光のみを透過させる受光波長域選択手段が受光レンズそのものであるため、部品点数を増やすことなく、確実に隣接する反射型光電センサ同士の相互干渉を防ぐことが可能となる。   According to a preferred embodiment of the present invention, the light receiving wavelength range selecting means is a light receiving lens whose material is selected so as to have a desired light wavelength range selective pass characteristic. According to such a configuration, since the light receiving wavelength range selecting means that transmits only light having a light wavelength range component designated in advance is the light receiving lens itself, the adjacent reflection type photoelectric photoelectric sensor can be reliably used without increasing the number of components. It becomes possible to prevent mutual interference between sensors.

本発明の好ましい実施の形態によれば、受光波長域選択手段が、受光レンズと受光素子との間に介在され、かつ目的とする光波長域選択通過特性を有する光学フィルタである。このような構成によれば、光波長域選択通過特性を有する光学フィルタは比較的安価に入手可能なので、さほどコストアップを招かずとも確実に隣接する反射型光電センサ同士の相互干渉を防ぐことが可能となる。   According to a preferred embodiment of the present invention, the light receiving wavelength range selecting means is an optical filter that is interposed between the light receiving lens and the light receiving element and has a desired light wavelength range selective pass characteristic. According to such a configuration, since an optical filter having a light wavelength range selective transmission characteristic is available at a relatively low cost, mutual interference between adjacent reflective photoelectric sensors can be surely prevented without much cost increase. It becomes possible.

本発明の好ましい実施の形態によれば、各反射型光電センサの投光素子として、それぞれ目的とする投光の光波長域特性に符合する発光周波数特性を有する投光素子が内蔵されている。このような構成により、例えば、赤色ＬＥＤ、青色ＬＥＤ、緑色ＬＥＤなどの異なる発光波長特性を有する光源を投光素子として隣接する投光器にてそれぞれ使用することにより、受光素子側の受光波長域選択手段を対応する投光素子の発光波長のみを受光し、その他の発光波長を有する光は受光しないように構成することが可能となり、その結果、隣接する反射型光電センサ同士の相互干渉を確実に防ぐことが可能となる   According to a preferred embodiment of the present invention, a light projecting element having a light emission frequency characteristic that matches a light wavelength band characteristic of a target light projecting is incorporated as a light projecting element of each reflective photoelectric sensor. With such a configuration, for example, by using light sources having different emission wavelength characteristics such as red LEDs, blue LEDs, and green LEDs as light projecting elements in adjacent projectors, the light receiving wavelength region selecting means on the light receiving element side Can be configured to receive only the emission wavelength of the corresponding light projecting element and not to receive light having other emission wavelengths, and as a result, it is possible to reliably prevent mutual interference between adjacent reflective photoelectric sensors. It becomes possible

本発明の好ましい実施の形態によれば、反射型光電センサの投光素子より投光される光が可視光線である。このような構成によれば、隣接する反射型光電センサの投光素子において、それぞれ異なる発光波長（色）を有する投光素子を使用しても、外観上の見分けが可能となり、反射型光電センサを設置する際に正確な配列が容易となる。   According to a preferred embodiment of the present invention, the light projected from the light projecting element of the reflective photoelectric sensor is visible light. According to such a configuration, it is possible to distinguish the appearance of the light projecting elements of adjacent reflective photoelectric sensors even if the light projecting elements having different emission wavelengths (colors) are used. Accurate alignment is facilitated when installing.

尚、『反射型光電センサ』とあるが、反射型光電センサにおいては、計測対象物体の背後に回帰反射板を配置して、計測対象物体の表面からの反射光の受光量と、計測対象物体が存在しない場合の反射板からの反射光の受光量とを検知して比較することにより、計測対象物体の存在の有無を検知する回帰反射型光電センサも知られている。ここで言う『反射型光電センサ』とは、そのような回帰反射型光電センサを含むものである。   In addition, although there is a “reflective photoelectric sensor”, in the reflective photoelectric sensor, a return reflection plate is arranged behind the measurement target object, and the amount of received light reflected from the surface of the measurement target object and the measurement target object. There is also known a regressive reflection type photoelectric sensor that detects the presence / absence of an object to be measured by detecting and comparing the amount of received light reflected from a reflection plate when no light is present. The “reflective photoelectric sensor” referred to here includes such a regression reflective photoelectric sensor.

以上の説明で明らかなように、本発明によれば、設置・配線工数などを増やすことなく複数連装される光電センサ同士の相互干渉を確実に防ぐことが可能となる、という利点を有する。   As apparent from the above description, according to the present invention, there is an advantage that it is possible to surely prevent mutual interference between a plurality of photoelectric sensors arranged in series without increasing the number of installation and wiring man-hours.

以下に、この発明に好適な実施の一形態を添付図面を参照しながら詳細に説明する。尚、以下に説明する実施の形態は、本発明のほんの一例を示すものに過ぎず、本発明の要旨とするところは、特許請求の範囲の記載によってのみ規定されるものである。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment suitable for the present invention will be described in detail with reference to the accompanying drawings. The embodiment described below is merely an example of the present invention, and the gist of the present invention is defined only by the description of the claims.

本発明の光電センサシステムにおける相互干渉防止構成は、透過型と反射型との双方の光電センサに対して適用可能である。   The mutual interference prevention structure in the photoelectric sensor system of the present invention is applicable to both transmissive and reflective photoelectric sensors.

また、本発明は、光電センサにて投光素子として用いられるＬＥＤの多色化に着目し、ＬＥＤから発せられる光受光部側において、投光される光に含まれる発光波長によって選択的に透過させる選択手段を備えさせることにより、受光部が対象とする投光素子を備える投光器からの光のみを受光するようにしたものである。   Further, the present invention pays attention to the multi-coloring of the LED used as the light projecting element in the photoelectric sensor, and selectively transmits the light on the light receiving unit side emitted from the LED according to the emission wavelength included in the light to be projected. By providing the selecting means to be received, only the light from the light projector including the light projecting element which is the target of the light receiving unit is received.

図１に示されているのは受光レンズによる光選択方式の説明図である。尚、同図において示されているのは透過型光電センサの一例である。同図において、１１は投光素子、１２は投光レンズ、１３は受光レンズ、そして１４は受光素子をそれぞれ示している。また、本発明によれば、投光素子としては、隣接する光電センサにおいてそれぞれ異なる発光波長特性を有するものを使用するため、１１ａは赤色ＬＥＤ、１１ｂは緑色ＬＥＤ、そして１１ｃは青色ＬＥＤを示すものである。そして、本発明においては、後により詳細に説明するが、受光器側の受光レンズに、予め対応付けられた投光素子からの光に含まれる発光波長のみを選択的に透過させるための受光波長域選択手段が組み込まれる。従って、同図における１３ａは、赤色光は透過させるが緑色光及び青色光は透過させない特性を有する受光レンズ、１３ｂは緑色光は透過させるが赤色光及び青色光は透過させない特性を有する受光レンズ、１３ｃは青色光は透過させるが赤色光及び緑色光は透過させない特性を有する受光レンズとをそれぞれ示している。   FIG. 1 is an explanatory diagram of a light selection method using a light receiving lens. In the figure, an example of a transmission photoelectric sensor is shown. In the figure, 11 is a light projecting element, 12 is a light projecting lens, 13 is a light receiving lens, and 14 is a light receiving element. Further, according to the present invention, since the light emitting elements having different emission wavelength characteristics are used in adjacent photoelectric sensors, 11a indicates a red LED, 11b indicates a green LED, and 11c indicates a blue LED. It is. In the present invention, as will be described in more detail later, the light receiving wavelength for selectively transmitting only the light emitting wavelength included in the light from the light projecting element previously associated with the light receiving lens on the light receiver side. A range selection means is incorporated. Therefore, 13a in the figure is a light receiving lens having a characteristic of transmitting red light but not transmitting green light and blue light, 13b is a light receiving lens having characteristics of transmitting green light but not red light and blue light, Reference numeral 13c denotes a light receiving lens having a characteristic of transmitting blue light but not transmitting red light and green light.

図１（ａ）にて示されるように、赤色ＬＥＤ（投光素子）１１ａから投光される光は、投光レンズ１２を介して受光レンズ１３ａへと照射される。ここで、この受光レンズ１３ａは赤色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ａより投光される赤色光は受光レンズ１３ａ透過して受光素子１４にて受光される。   As shown in FIG. 1A, the light projected from the red LED (light projecting element) 11 a is irradiated to the light receiving lens 13 a through the light projecting lens 12. Here, since the light receiving lens 13a has a characteristic of transmitting the emission wavelength included in the red light, the red light projected from the light projecting element 11a passes through the light receiving lens 13a and is received by the light receiving element 14.

同様に、図１（ｂ）にて示されるように、緑色ＬＥＤ（投光素子）１１ｂから投光される光は、投光レンズ１２を介して受光レンズ１３ｂへと照射される。ここで、この受光レンズ１３ｂは緑色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ｂより投光される緑色光は受光レンズ１３ｂ透過して受光素子１４にて受光される。   Similarly, as shown in FIG. 1B, the light projected from the green LED (light projecting element) 11 b is irradiated to the light receiving lens 13 b through the light projecting lens 12. Here, since the light receiving lens 13b has a characteristic of transmitting the emission wavelength included in the green light, the green light projected from the light projecting element 11b passes through the light receiving lens 13b and is received by the light receiving element.

同様に、図１（ｃ）にて示されるように、青色ＬＥＤ（投光素子）１１ｃから投光される光は、投光レンズ１２を介して受光レンズ１３ｃへと照射される。ここで、この受光レンズ１３ｃは青色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ｃより投光される青色光は受光レンズ１３ｃ透過して受光素子１４にて受光される。   Similarly, as shown in FIG. 1C, the light projected from the blue LED (light projecting element) 11 c is irradiated to the light receiving lens 13 c through the light projecting lens 12. Here, since the light receiving lens 13c has a characteristic of transmitting the emission wavelength included in the blue light, the blue light projected from the light projecting element 11c is transmitted through the light receiving lens 13c and received by the light receiving element 14.

図１（ａ）、（ｂ）、及び（ｃ）にて示される構成を有する光電センサを隣接して配置すれば、例えば、投光素子１１ａより投光される赤色光が受光レンズ１３ａのみならず、隣接配置される他の受光器の受光レンズ１３ｂ及び１３ｃも照射領域に含んでしまうような場合においても、受光レンズ１３ｂ及び１３ｃは投光素子１１ａからの赤色光に含まれる発光波長は透過させない特性を有するため、投光素子１１ａに対応付けられている受光素子においてのみ受光される。同様に、投光素子１１ｂ及び１１ｃからの光も、各受光レンズによって選択的に透過されるため、それぞれ対応付けられている受光素子においてのみ受光される。従って、これらの光電センサを隣接配置する場合においても、隣接他機同士の相互干渉が確実に防止される。   If photoelectric sensors having the configurations shown in FIGS. 1A, 1B, and 1C are arranged adjacent to each other, for example, if the red light projected from the light projecting element 11a is only the light receiving lens 13a, Even when the light receiving lenses 13b and 13c of other adjacent light receivers are included in the irradiation region, the light receiving lenses 13b and 13c transmit the emission wavelength included in the red light from the light projecting element 11a. Therefore, the light is received only by the light receiving element associated with the light projecting element 11a. Similarly, since the light from the light projecting elements 11b and 11c is selectively transmitted by the respective light receiving lenses, the light is received only by the corresponding light receiving elements. Therefore, even when these photoelectric sensors are arranged adjacent to each other, mutual interference between adjacent other devices is reliably prevented.

次に、フィルタ板による光選択方式の説明図が図２に示されている。尚、同図においても示されているのは透過型光電センサの一例である。同図においては、図１にて示される受光レンズによる光選択方式を、受光レンズではなくフィルタ板を用いて行う場合が示されている。そのため、基本的な構成は図１とほぼ同じであるため、同一構成要素には同じ符号を付与し、説明を省略する。   Next, an explanatory diagram of a light selection method using a filter plate is shown in FIG. Also shown in the figure is an example of a transmission type photoelectric sensor. In the figure, the case where the light selection method by the light receiving lens shown in FIG. 1 is performed using a filter plate instead of the light receiving lens is shown. Therefore, since the basic configuration is almost the same as that in FIG. 1, the same reference numerals are given to the same components, and description thereof is omitted.

図２において、図１と異なる点は、受光レンズとしては受光波長域選択手段を有さない通常の受光レンズ１３が用いられ、受光レンズ１３と受光素子１４との間にフィルタ板１５を介在させる点にある。この実施の形態においては、フィルタ板１５に受光波長域選択手段を備えさせているため、同図にて１５ａは赤色光は透過させるが緑色光及び青色光は透過させない特性を有するフィルタ板、１５ｂは緑色光は透過させるが赤色光及び青色光は透過させない特性を有するフィルタ板、１５ｃは青色光は透過させるが赤色光及び緑色光は透過させない特性を有するフィルタ板とをそれぞれ示している。   2 is different from FIG. 1 in that a normal light receiving lens 13 having no light receiving wavelength range selecting means is used as a light receiving lens, and a filter plate 15 is interposed between the light receiving lens 13 and the light receiving element 14. In the point. In this embodiment, since the filter plate 15 is provided with a light receiving wavelength range selecting means, in the same figure, 15a is a filter plate having a characteristic of transmitting red light but not transmitting green light and blue light, 15b Represents a filter plate having a characteristic of transmitting green light but not of red light and blue light, and 15c represents a filter plate having a characteristic of transmitting blue light but not red light and green light.

図２（ａ）にて示されるように、赤色ＬＥＤ（投光素子）１１ａから投光される赤色光は、投光レンズ１２を介して受光レンズ１３へと照射される。投光素子１１ａからの赤色光はこの受光レンズ１３を透過し、フィルタ板１５ａへと照射される。このフィルタ板１５ａは、赤色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ａより投光される赤色光はフィルタ板１５ａ透過して受光素子１４にて受光される。   As shown in FIG. 2A, red light projected from the red LED (light projecting element) 11 a is irradiated to the light receiving lens 13 through the light projecting lens 12. The red light from the light projecting element 11a passes through the light receiving lens 13 and is irradiated onto the filter plate 15a. Since the filter plate 15 a has a characteristic of transmitting the emission wavelength included in the red light, the red light projected from the light projecting element 11 a is transmitted through the filter plate 15 a and received by the light receiving element 14.

同様に、図２（ｂ）にて示されるように、緑色ＬＥＤ（投光素子）１１ｂから投光される緑色光は、投光レンズ１２を介して受光レンズ１３ｂへと照射される。投光素子１１ｂからの緑色光はこの受光レンズ１３を透過し、フィルタ板１５ｂへと照射される。このフィルタ板１５ｂは、緑色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ｂより投光される緑色光はフィルタ板１５ｂ透過して受光素子１４にて受光される。   Similarly, as shown in FIG. 2B, the green light projected from the green LED (light projecting element) 11 b is irradiated to the light receiving lens 13 b through the light projecting lens 12. Green light from the light projecting element 11b passes through the light receiving lens 13 and is irradiated onto the filter plate 15b. Since the filter plate 15 b has a characteristic of transmitting the emission wavelength included in the green light, the green light projected from the light projecting element 11 b is transmitted through the filter plate 15 b and received by the light receiving element 14.

同様に、図２（ｃ）にて示されるように、青色ＬＥＤ（投光素子）１１ｃから投光される青色光は、投光レンズ１２を介して受光レンズ１３ｃへと照射される。投光素子１１ｃからの青色光はこの受光レンズ１３を透過し、フィルタ板１５ｃへと照射される。このフィルタ板１５ｃは、青色光に含まれる発光波長は透過させる特性を有するので、投光素子１１ｃより投光される青色光はフィルタ板１５ｃ透過して受光素子１４にて受光される。   Similarly, as shown in FIG. 2C, the blue light projected from the blue LED (light projecting element) 11 c is irradiated to the light receiving lens 13 c via the light projecting lens 12. Blue light from the light projecting element 11c passes through the light receiving lens 13 and is irradiated onto the filter plate 15c. Since the filter plate 15c has a characteristic of transmitting the emission wavelength included in the blue light, the blue light projected from the light projecting element 11c is transmitted through the filter plate 15c and received by the light receiving element 14.

フィルタ板による光選択方式においても、図２（ａ）、（ｂ）、及び（ｃ）にて示される構成を有する光電センサを隣接して配置すれば、例えば、投光素子１１ａより投光される赤色光が受光器側の受光レンズ１３を介し、フィルタ板１５ａのみならず、隣接他機の受光レンズ１３を介してフィルタ板１５ｂ及び１５ｃにも照射されるようであっても、フィルタ板１５ｂ及び１５ｃは投光素子１１ａからの赤色光に含まれる発光波長は透過させない特性を有するため、投光素子１１ａに対応付けられている受光器の受光素子においてのみ投光される光が透過され受光される。同様に、投光素子１１ｂ及び１１ｃからの光も、各受光素子の前面に配置されるフィルタ板１５によって選択的に透過され、それぞれ対応付けられている受光器の受光素子においてのみ受光される。従って、これらの光電センサを隣接配置する場合においても、相互干渉が確実に防止される。   Also in the light selection method using the filter plate, if the photoelectric sensors having the configurations shown in FIGS. 2A, 2B, and 2C are arranged adjacent to each other, for example, light is projected from the light projecting element 11a. Even if the red light is irradiated not only to the filter plate 15a but also to the filter plates 15b and 15c via the light receiving lens 13 of the adjacent other device through the light receiving lens 13 on the light receiver side, the filter plate 15b And 15c have a characteristic of not transmitting the light emission wavelength included in the red light from the light projecting element 11a, so that the light projected only at the light receiving element of the light receiver associated with the light projecting element 11a is transmitted and received. Is done. Similarly, light from the light projecting elements 11b and 11c is selectively transmitted by the filter plate 15 disposed in front of each light receiving element, and received only by the light receiving elements of the associated light receivers. Therefore, even when these photoelectric sensors are arranged adjacent to each other, mutual interference is reliably prevented.

上述の受光レンズによる光選択方式、並びにフィルタ板による光選択方式における受光波長域選択手段の原理が図３の受光素子及びフィルタ板の特性曲線によって示されている。   The principle of the light receiving wavelength region selecting means in the light selection method using the light receiving lens and the light selection method using the filter plate is shown by the characteristic curves of the light receiving element and the filter plate in FIG.

図３（ａ）は、投光素子の発光波長特性を示す図であり、投光器内の投光素子として用いられる赤色ＬＥＤ、緑色ＬＥＤ、及び青色ＬＥＤのスペクトルが示されている。また、同図における縦軸が光強度比率を、そして横軸が発光波長をそれぞれ示している。同図において、６６０±２５ｎｍの波長にて示されるのが赤色ＬＥＤの波長、５２５±２５ｎｍの波長にて示されるのが緑色ＬＥＤの波長、そして４７０±２５ｎｍの波長にて示されるのが青色ＬＥＤの波長である。   FIG. 3A is a diagram showing the emission wavelength characteristic of the light projecting element, and shows the spectrum of the red LED, the green LED, and the blue LED used as the light projecting element in the projector. In addition, the vertical axis in the figure indicates the light intensity ratio, and the horizontal axis indicates the emission wavelength. In the figure, a wavelength of 660 ± 25 nm indicates a wavelength of a red LED, a wavelength of 525 ± 25 nm indicates a wavelength of a green LED, and a wavelength of 470 ± 25 nm indicates a blue LED. Is the wavelength.

図３（ｂ）は、フィルタ板の光透過波長特性を示す図である。同図において、縦軸が透過率を、そして横軸は波長をそれぞれ示している。同図においては、３種類のフィルタの光透過波長特性が示されている。   FIG. 3B is a diagram illustrating the light transmission wavelength characteristics of the filter plate. In the figure, the vertical axis indicates the transmittance, and the horizontal axis indicates the wavelength. In the figure, the light transmission wavelength characteristics of three types of filters are shown.

この図３（ｂ）にて示されるフィルタの光透過波長特性を、図３（ａ）にて示される投光素子の発光波長特性と照らし合わせることによって明らかであるが、６００ｎｍ以上の波長を有する光のみを透過させる特性を有しているフィルタは６６０±２５ｎｍの波長を有する赤色ＬＥＤの光は透過させるが、５２５±２５ｎｍの波長を有する緑色ＬＥＤ及び４７０±２５ｎｍの波長を有する青色ＬＥＤの光は透過させない特性を有するものである。この特性を用いることにより、赤波長透過フィルタを作成することが可能となる。   Although it is clear by comparing the light transmission wavelength characteristic of the filter shown in FIG. 3B with the emission wavelength characteristic of the light projecting element shown in FIG. 3A, it has a wavelength of 600 nm or more. A filter having a property of transmitting only light transmits light of a red LED having a wavelength of 660 ± 25 nm, but light of a green LED having a wavelength of 525 ± 25 nm and light of a blue LED having a wavelength of 470 ± 25 nm. Has the property of not transmitting. By using this characteristic, it is possible to create a red wavelength transmission filter.

同様に、５００〜５８０ｎｍの波長を有する光のみを透過させる特性を有しているフィルタは５２５±２５ｎｍの波長を有する緑色ＬＥＤの光は透過させるが、６６０±２５ｎｍの波長を有する赤色ＬＥＤ及び４７０±２５ｎｍの波長を有する青色ＬＥＤの光は透過させない特性を有するものである。この特性を用いることにより、緑波長透過フィルタを作成することが可能となる。   Similarly, a filter having the characteristic of transmitting only light having a wavelength of 500 to 580 nm transmits light of a green LED having a wavelength of 525 ± 25 nm, but a red LED having a wavelength of 660 ± 25 nm and 470 The blue LED having a wavelength of ± 25 nm does not transmit light. By using this characteristic, a green wavelength transmission filter can be created.

同様に、３８０〜５００ｎｍの波長を有する光のみを透過させる特性を有しているフィルタは４７０±２５ｎｍの波長を有する青色ＬＥＤの光は透過させるが、６６０±２０ｎｍの波長を有する赤色ＬＥＤ及び５２５±３５ｎｍの波長を有する緑色ＬＥＤの光は透過させない特性を有するものである。この特性を用いることにより、青波長透過フィルタを作成することが可能となる。   Similarly, a filter having a characteristic of transmitting only light having a wavelength of 380 to 500 nm transmits light of a blue LED having a wavelength of 470 ± 25 nm, but a red LED having a wavelength of 660 ± 20 nm and 525 The green LED having a wavelength of ± 35 nm has a characteristic not to transmit light. By using this characteristic, a blue wavelength transmission filter can be created.

このような構成とすることにより、例えば、赤波長透過フィルタを内蔵した受光器は、６００ｎｍ以上の波長を有する投光素子の光のみを選択的に透過し、受光することが可能となる。よって、６６０ｎｍの波長を発する赤色ＬＥＤを内蔵している投光器の赤色光のみ入光が可能とされる。同様に、緑波長透過フィルタと青波長透過フィルタにおいても、互いに波長の一致する投光素子の光のみ透過する。よって、緑波長透過フィルタは緑色ＬＥＤを内蔵している投光器からの緑色光のみで入光が可能とされ、青波長透過フィルタは青色ＬＥＤを内蔵している投光器からの青色光のみで入光が可能とされる。従って、これらの異なる投光素子、及び受光波長域選択手段を有する光電センサを隣接配置すれば、隣接配置される光電センサ同士の相互干渉は生じない。   By adopting such a configuration, for example, a light receiver with a built-in red wavelength transmission filter can selectively transmit and receive only light from a light projecting element having a wavelength of 600 nm or more. Therefore, only red light from a projector having a built-in red LED emitting a wavelength of 660 nm can be incident. Similarly, in the green wavelength transmission filter and the blue wavelength transmission filter, only light from the light projecting elements having the same wavelength is transmitted. Therefore, the green wavelength transmission filter can receive light only from the green light from the projector incorporating the green LED, and the blue wavelength transmission filter can receive light only from the blue light from the projector incorporating the blue LED. It is possible. Therefore, if these different light projecting elements and photoelectric sensors having the light receiving wavelength range selecting means are disposed adjacent to each other, mutual interference between the adjacently disposed photoelectric sensors does not occur.

更に、図示しないが、このような構成によって特定の投光素子からの光を発光波長に基づき選択的に透過するようにすることにより、波長帯幅が狭い投光素子と投光波長が狭いフィルタとを組み合わせて用いることによって、何組でも相互干渉の防止が可能となる。また、部品点数もフィルタの増加のみとなり、設置・配線工数は従来と同一であるため手間もかからない。尚、本実施形態のように、３組の光電センサを隣接配置するような場合においては、フィルタの波長帯幅に関してもさほど狭いものを使用する必要はなく、コストの低いフィルム状のものをフィルタとして使用できるため、安価に対応することが可能である。   Further, although not shown in the drawing, by such a configuration, light from a specific light projecting element is selectively transmitted based on the emission wavelength, so that a light projecting element having a narrow wavelength band and a filter having a narrow light projecting wavelength are used. By using in combination, any number of pairs can prevent mutual interference. In addition, the number of parts is only increased by the number of filters, and installation and wiring man-hours are the same as the conventional one, so it does not take time. In the case where three sets of photoelectric sensors are arranged adjacent to each other as in the present embodiment, it is not necessary to use a filter having a narrow wavelength band, and a low-cost film-shaped filter can be used. Can be used at low cost.

また、受光器側の受光レンズの樹脂材料としてＰＭＭＡもしくはＰＣを用いて製作し、この樹脂材料に特殊顔料を含有させることによって、その顔料の種類により、例えば、赤色、緑色、及び青色の光のみを透過させる受光レンズを作成することが可能である。そして、このような構成とすることにより、上述のフィルタを用いた受光波長域選択手段を受光レンズに組み込ませて行うことが可能となり、同様の効果を部品点数を増やすことなく実現することができる。   Also, it is manufactured using PMMA or PC as the resin material of the light receiving lens on the light receiver side, and by including a special pigment in this resin material, for example, only red, green, and blue light depending on the type of the pigment It is possible to create a light-receiving lens that transmits light. And by setting it as such a structure, it becomes possible to integrate the light reception wavelength range selection means using the above-mentioned filter in a light reception lens, and can implement | achieve the same effect, without increasing a number of parts. .

本発明が適用された透過型光電センサの受光器の断面図が図４に示されている。同図にて示されるように、この光電センサの受光器２１は透過型として構成されたものであり、ケース３０と、このケース３０の前面側開口に装着される受光用光学系と、ケース３０の後面側開口に装着される後面板３２と、ケース３０の上面側開口に組み込まれる操作ボタン３７及び制御出力表示灯３６とを主体として構成されている。尚、図において、符号３８は電気コード、３９は電気コードと３８に装着されケース３０に嵌合されるコードプロテクタ、３１は受光レンズ３１ａが形成された前面板である。   A cross-sectional view of a light receiving device of a transmission photoelectric sensor to which the present invention is applied is shown in FIG. As shown in the figure, the light receiver 21 of this photoelectric sensor is configured as a transmissive type, and includes a case 30, a light receiving optical system attached to the front side opening of the case 30, and the case 30. The rear plate 32 mounted in the rear opening and the operation button 37 and the control output indicator lamp 36 incorporated in the upper opening of the case 30 are mainly configured. In the figure, reference numeral 38 denotes an electric cord, 39 denotes an electric cord and a cord protector fitted to the case 30 and fitted to the case 30, and 31 denotes a front plate on which a light receiving lens 31a is formed.

受光用光学系は、レンズ部３１ａを有する前面板３１と、受光素子１４、フィルタ板１５、及び回路基板３３とを合成樹脂製のホルダブロック３４を介して一体的に結合してなるものである。このフィルタ板１５は、上述のように特定の光に含まれる発光波長のみを透過する、赤波長透過フィルタ、緑波長透過フィルタ、又は青波長透過フィルタのいずれかが投光器の投光素子に対応するように選択され、設置されている。前面板３１の裏面には、受光レンズ部３１ａが膨出形成されている。回路基板３３は受光素子１４に電気的に接続されている。   The light receiving optical system is formed by integrally coupling a front plate 31 having a lens portion 31a, a light receiving element 14, a filter plate 15, and a circuit board 33 through a holder block 34 made of synthetic resin. . In the filter plate 15, as described above, any one of the red wavelength transmission filter, the green wavelength transmission filter, and the blue wavelength transmission filter that transmits only the emission wavelength included in the specific light corresponds to the light projecting element of the projector. So selected and installed. On the back surface of the front plate 31, a light receiving lens portion 31a is bulged. The circuit board 33 is electrically connected to the light receiving element 14.

この受光器２１において、投光器からの光が照射されると、レンズ部３１ａを介してフィルタ板１５に光が照射される。このとき、フィルタ板１５は、対応する投光器からの光のみ透過する選択手段を備えているため、受光器２１と予め対応付けられている投光器からの光のみを選択的に透過させる。フィルタ板１５によって透過された光は受光素子１４によって受光され、回路基板３３上に設けられる信号処理回路によって受光量に対応する電気信号が生成され、電気コード３８を介して外部に出力される。   In the light receiver 21, when the light from the projector is irradiated, the filter plate 15 is irradiated with light through the lens portion 31a. At this time, the filter plate 15 includes selection means that transmits only light from the corresponding projector, and therefore selectively transmits only light from the projector that is associated with the light receiver 21 in advance. The light transmitted by the filter plate 15 is received by the light receiving element 14, an electric signal corresponding to the amount of received light is generated by a signal processing circuit provided on the circuit board 33, and is output to the outside through the electric cord 38.

制御出力表示灯３６は、受光素子１４により受光される光量などに応じて受光器２１の出力状況などを外部へと視覚を通じて伝達するための表示灯である。また、操作ボタン３７は、受光器２１における諸設定などを外部から行うための押しボタンである。   The control output indicator lamp 36 is an indicator lamp for visually transmitting the output status of the light receiver 21 to the outside according to the amount of light received by the light receiving element 14. The operation button 37 is a push button for performing various settings in the light receiver 21 from the outside.

尚、同図においては、フィルタ板による光選択方式を採用した透過型光電センサの受光器を示しているが、ここで、受光レンズによる光選択方式を採用しても同様の効果を得ることができる。受光レンズによる選択方式を採用した透過型光電センサの受光器においても、上述のフィルタ板による選択方式を採用した場合とほぼ同様の構成を有するものである。受光レンズによる光選択方式を採用した場合の相違点は、レンズ部１３ａを有する前面板１３を目的とする光波長域選択通過特性を有する材質によって構成し、フィルタ板１５が不要になる点にある。。従って、受光波長域選択手段がレンズ部１３ａに備えられるため、フィルタ板１５を備える必要が無くなり、部品点数を減らす効果も有する。ここでも、受光レンズ部１３ａに赤波長通過特性、緑波長通過特性、及び青波長通過特性を、対応付けられる投光器の投光素子に応じて選択し、設置することで同様の効果を得ることが可能となる。   In the figure, a light receiving device of a transmission type photoelectric sensor that employs a light selection method using a filter plate is shown. However, even if the light selection method using a light receiving lens is employed, the same effect can be obtained. it can. The light receiving device of the transmissive photoelectric sensor that employs the selection method using the light receiving lens also has a configuration that is almost the same as that of the case where the selection method using the filter plate described above is employed. The difference in the case of adopting the light selection method by the light receiving lens is that the front plate 13 having the lens portion 13a is made of a material having a desired light wavelength range selective transmission characteristic, and the filter plate 15 becomes unnecessary. . . Therefore, since the light receiving wavelength range selecting means is provided in the lens portion 13a, it is not necessary to provide the filter plate 15, and the number of parts can be reduced. Here, the same effect can be obtained by selecting and installing the red wavelength transmission characteristic, the green wavelength transmission characteristic, and the blue wavelength transmission characteristic in the light receiving lens unit 13a in accordance with the light projecting element of the corresponding projector. It becomes possible.

図５において、本発明が適用された透過型実装センサの３連装配置状態が示されている。同図にて示されるように、投光器２０ａ、２０ｂ、及び２０ｃは一列に隣接配置されており、それぞれ対応付けられている受光器２１ａ、２１ｂ、及び２１ｃは、対応する投光器に対向する位置に同じく隣接配置される。そして、計測対象となるワークＷは、投光器列と受光器列との間に規定される計測領域を同図中矢印Ａにて示される方向に移動するように設定されている。   FIG. 5 shows a three-element arrangement state of a transmissive type mounting sensor to which the present invention is applied. As shown in the figure, the projectors 20a, 20b, and 20c are adjacently arranged in a line, and the associated light receivers 21a, 21b, and 21c are the same as the positions facing the corresponding projectors. Adjacent to each other. And the workpiece | work W used as a measuring object is set so that the measurement area | region prescribed | regulated between a light projector row | line | column and a light receiver row | line | column may be moved to the direction shown by the arrow A in the figure.

このとき、投光器２０ａ及び受光器２１ａはそれぞれ赤色対応構造とされ、投光器２０ａにおいては、赤色ＬＥＤが投光素子として用いられる。一方で、受光器２１ａにおいては、赤色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、採用される光選択方式によるが、赤波長透過特性を有する受光レンズ、又はフィルタ板を有している。   At this time, each of the projector 20a and the light receiver 21a has a red-corresponding structure, and the red LED is used as a projector element in the projector 20a. On the other hand, the light receiver 21a is provided with a light receiving wavelength range selecting means that transmits only the emission wavelength included in the red LED. That is, it has a light receiving lens or filter plate having a red wavelength transmission characteristic, depending on the light selection method employed.

また、投光器２０ｂ及び受光器２１ｂはそれぞれ緑色対応構造とされ、投光器２０ｂにおいては、緑色ＬＥＤが投光素子として用いられる。一方で、受光器２１ｂにおいては、緑色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、採用される光選択方式によるが、緑波長透過特性を有する受光レンズ、又はフィルタ板を有している。   Further, the projector 20b and the light receiver 21b each have a green-compatible structure, and the green LED is used as a projector element in the projector 20b. On the other hand, the light receiver 21b is provided with a light reception wavelength range selection means that transmits only the emission wavelength included in the green LED. That is, it has a light receiving lens or a filter plate having a green wavelength transmission characteristic, depending on the light selection method employed.

また、投光器２０ｃ及び受光器２１ｃはそれぞれ青色対応構造とされ、投光器２０ｃにおいては、青色ＬＥＤが投光素子として用いられる。一方で、受光器２１ｃにおいては、青色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、採用される光選択方式によるが、青波長透過特性を有する受光レンズ、又はフィルタ板を有している。   Further, the projector 20c and the light receiver 21c each have a blue-corresponding structure, and a blue LED is used as a projector element in the projector 20c. On the other hand, the light receiver 21c is provided with a light reception wavelength range selection means that transmits only the emission wavelength included in the blue LED. That is, it has a light-receiving lens or a filter plate having a blue wavelength transmission characteristic, depending on the light selection method employed.

このように、連装される光電センサにおいて、投光器２０ａ、２０ｂ、及び２０ｃはそれぞれ異なる発光波長を有する光を投光し、受光器２１ａ、２１ｂ、及び２１ｃはそれぞれ所定の波長を有する光のみを受光し、その他の波長を有する光は受光しない構造とされている。そのため、投光器２０ａから投光される赤色光が、受光器２１ａ、２１ｂ、及び２１ｃの全てをその投光領域に含んでしまっても、実際に受光が行われるのは、投光器２０ａの投光素子である赤色ＬＥＤの発光波長を受光するように構成された受光器２１ａのみであり、２１ｂ及び２１ｃにおいては、光の照射は受けるものの、それぞれ赤色ＬＥＤに含まれる発光波長は受光レンズ、又はフィルタ板により透過されないため受光は行われない。   In this way, in the photoelectric sensor that is connected, the projectors 20a, 20b, and 20c project light having different emission wavelengths, and the light receivers 21a, 21b, and 21c receive only light having a predetermined wavelength. However, light having other wavelengths is not received. Therefore, even if the red light projected from the projector 20a includes all of the light receivers 21a, 21b, and 21c in the projection area, the light is actually received by the projector element of the projector 20a. Only the light receiver 21a configured to receive the light emission wavelength of the red LED is, and the light emission wavelengths included in the red LED are respectively received by the light receiving lens or the filter plate, although they are irradiated with light in 21b and 21c. Therefore, no light is received.

同様に投光器２０ｂから投光される緑色光が、受光器２１ａ、２１ｂ、及び２１ｃの全てをその投光領域に含んでしまっても、実際に受光が行われるのは、投光器２０ｂの投光素子である緑色ＬＥＤの発光波長を受光するように構成された受光器２１ｂのみであり、２１ａ及び２１ｃにおいては、光の照射は受けるものの、それぞれ緑色ＬＥＤに含まれる発光波長は受光レンズ、又はフィルタ板により透過されないため受光は行われない。   Similarly, even if the green light projected from the light projector 20b includes all of the light receivers 21a, 21b, and 21c in the light projection area, the light is actually received by the light projecting element of the light projector 20b. Only the light receiver 21b configured to receive the light emission wavelength of the green LED, and the light emission wavelengths included in the green LED are received by the light receiving lens or the filter plate, respectively, although the light is irradiated at 21a and 21c. Therefore, no light is received.

同様に投光器２０ｃから投光される青色光が、受光器２１ａ、２１ｂ、及び２１ｃの全てをその投光領域に含んでしまっても、実際に受光が行われるのは、投光器２０ｃの投光素子である青色ＬＥＤの発光波長を受光するように構成された受光器２１ｃのみであり、２１ａ及び２１ｂにおいては、光の照射は受けるものの、それぞれ緑色ＬＥＤに含まれる発光波長は受光レンズ、又はフィルタ板により透過されないため受光は行われない。   Similarly, even if the blue light projected from the projector 20c includes all of the light receivers 21a, 21b, and 21c in the projection area, the light is actually received by the projector element of the projector 20c. Only the light receiver 21c configured to receive the light emission wavelength of the blue LED is, and the light emission wavelengths included in the green LED are respectively received by the light receiving lens or the filter plate, although they are irradiated with light at 21a and 21b. Therefore, no light is received.

このように、隣接配置される光電センサをそれぞれ赤色対応、緑色対応、及び青色対応として構成することにより、隣接する光電センサ同士の相互干渉を確実に防止することができる。   As described above, the adjacent photoelectric sensors are configured to correspond to red, green, and blue, so that mutual interference between adjacent photoelectric sensors can be reliably prevented.

このような透過型光電センサシステムにおける相互干渉を防止する構造は反射型光電センサにも適応することが可能である。以下に、本発明が適用された反射型光電センサシステムの説明をする。   Such a structure for preventing mutual interference in the transmission type photoelectric sensor system can be applied to a reflection type photoelectric sensor. The reflective photoelectric sensor system to which the present invention is applied will be described below.

本発明が適用された反射型光電センサにおいても、透過型光電センサと同様に、受光レンズによる光選択方式とフィルタ板による光選択方式とがある。図６は受光レンズによる光選択方式を採用した反射型光電センサの説明図、図７はフィルタ板による光選択方式を採用した反射型光電センサの説明図を示すものである。   In the reflection type photoelectric sensor to which the present invention is applied, there are a light selection method using a light receiving lens and a light selection method using a filter plate, similarly to the transmission type photoelectric sensor. FIG. 6 is an explanatory view of a reflection type photoelectric sensor employing a light selection system using a light receiving lens, and FIG. 7 is an explanatory view of a reflection type photoelectric sensor employing a light selection system using a filter plate.

図６（ａ）において、受光レンズによる光選択方式を採用し、赤色光に対応するように構成された反射型光電センサの説明図が示されている。同図にて示されるように、反射型光電センサ４０ａは、投光用光学系と受光用光学系とを単一のホルダ４５内に上下に格納したものである。投光用光学系は投光用の投光素子４１ａと、遮光板４２、及び投光レンズ部４３から構成されるものであり、ホルダ４５によって一体的に結合されている。このとき、投光素子４１ａは、後述する受光素子４６と同様に、回路基板４４に接続されており、ホルダ４５により回路基板４４が固定される。   FIG. 6A shows an explanatory diagram of a reflective photoelectric sensor that adopts a light selection method using a light receiving lens and is configured to correspond to red light. As shown in the figure, the reflection type photoelectric sensor 40 a is one in which a light projecting optical system and a light receiving optical system are vertically stored in a single holder 45. The light projecting optical system is composed of a light projecting light projecting element 41 a, a light shielding plate 42, and a light projecting lens unit 43, and is integrally coupled by a holder 45. At this time, the light projecting element 41 a is connected to the circuit board 44 similarly to the light receiving element 46 described later, and the circuit board 44 is fixed by the holder 45.

この例の反射型光電センサの投光用光学系は、投光素子４１ａとして赤色ＬＥＤを採用している。投光素子４１ａの前面には遮光板４２が設置されており、投光素子４１ａからの光は、遮光板４２に設けられたピンホールを介して投光レンズ部４３に照射される。また、受光用光学系は、受光素子４６、遮光板４７、及び受光レンズ部４８ａから構成されるものであり、投光用光学系と同様にホルダ４５によって一体的に結合されている。ここで、受光素子４６は投光素子４１ａと同様に回路基板４４に接続されており、回路基板４４がホルダ４５によって固定されることにより他の受光用光学系と一体的に結合されるものである。また、この例においては、投光レンズ部４３及び受光レンズ部４８ａは共にホルダ４５の前面開口部に設置される前面板４９の一部として形成されている。そして、ホルダ４５には取付穴５５ａ及び５５ｂが開設されており、これらの取付穴５５ａ及び５５ｂを介して図示しないケース内に固定、格納される。   The light projecting optical system of the reflective photoelectric sensor of this example employs a red LED as the light projecting element 41a. A light shielding plate 42 is installed on the front surface of the light projecting element 41 a, and light from the light projecting element 41 a is applied to the light projecting lens unit 43 through a pinhole provided in the light shielding plate 42. The light receiving optical system includes a light receiving element 46, a light shielding plate 47, and a light receiving lens portion 48a, and is integrally coupled by a holder 45 in the same manner as the light projecting optical system. Here, the light receiving element 46 is connected to the circuit board 44 in the same manner as the light projecting element 41 a, and the circuit board 44 is fixed by a holder 45 so as to be integrally coupled with another light receiving optical system. is there. In this example, the light projecting lens portion 43 and the light receiving lens portion 48 a are both formed as a part of the front plate 49 installed in the front opening of the holder 45. The holder 45 is provided with mounting holes 55a and 55b, and is fixed and stored in a case (not shown) via the mounting holes 55a and 55b.

投光素子４１ａより投光される赤色光は、遮光板４２及び投光レンズ部４３を介して計測対象物の表面に照射する。計測対象物の表面に照射した光はその表面により反射され、受光レンズ部４８ａに照射される。   The red light projected from the light projecting element 41 a irradiates the surface of the measurement object via the light shielding plate 42 and the light projecting lens unit 43. The light applied to the surface of the measurement object is reflected by the surface and applied to the light receiving lens portion 48a.

このとき、受光レンズ部４８ａは、赤色光対応構成とされているため、赤色光に含まれる光波長のみを透過し、それ以外の波長の光は透過させない特性を持つ材質によって構成される。そのため、受光レンズ部４８ａに照射される光が、投光素子４１ａからの赤色光であれば、受光レンズ部４８ａを透過し、遮光板４７に設けられたピンホールを介して受光素子４６にて受光される。一方、受光レンズ部４８ａに照射される光が赤色光とは異なる波長を有する光であれば、受光レンズ部４８ａを透過できず、受光素子４６によって受光されることはない。   At this time, since the light receiving lens portion 48a has a configuration corresponding to red light, it is made of a material having a characteristic of transmitting only light wavelengths included in red light and not transmitting light of other wavelengths. Therefore, if the light irradiated to the light receiving lens portion 48 a is red light from the light projecting element 41 a, it passes through the light receiving lens portion 48 a and is received by the light receiving element 46 through the pinhole provided in the light shielding plate 47. Received light. On the other hand, if the light irradiated to the light receiving lens portion 48 a has a wavelength different from that of red light, the light receiving lens portion 48 a cannot be transmitted and is not received by the light receiving element 46.

図６（ｂ）において、受光レンズによる光選択方式を採用し、緑色光に対応するように構成された反射型光電センサの説明図が示されている。同図において、基本的な構成は赤色光に対応する図６（ａ）とほぼ同じであり、同一構成要素には同一符号を付与して説明を省略する。図６（ｂ）において、図６（ａ）との相違点は、投光素子４１ｂとして緑色ＬＥＤを採用していることと、受光レンズ４８ｂが緑色光に含まれる発光波長のみを透過し、その他の光は透過しない特性を有する材質によって構成されていることにある。そして、このような構成により、受光素子４６においては、投光素子４１ｂによって投光される緑色光のみを受光し、例えば、反射型光電センサ４０ａと隣接配置され、投光素子４１ａからの赤色光が反射型光電センサ４０ｂの受光レンズ部４８ｂに照射されるような場合においても、この赤色光は透過されないないため受光は行われない。同様に、反射型光電センサ４０ｂの投光素子４１ｂからの緑色光が反射型光電センサ４０ａの受光レンズ部４８ａに照射されるような場合においても、この緑色光は透過されない。そのため、このような構成を有する反射型光電センサ４０ａ及び４０ｂを隣接配置しても、相互干渉は確実に防ぐことが可能となる。   FIG. 6B shows an explanatory diagram of a reflective photoelectric sensor that adopts a light selection method using a light receiving lens and is configured to correspond to green light. In this figure, the basic configuration is almost the same as that in FIG. 6A corresponding to red light, and the same components are assigned the same reference numerals and description thereof is omitted. 6 (b) is different from FIG. 6 (a) in that a green LED is employed as the light projecting element 41b, and that the light receiving lens 48b transmits only the emission wavelength included in the green light. This is because it is made of a material having the characteristic of not transmitting light. With such a configuration, the light receiving element 46 receives only the green light projected by the light projecting element 41b. For example, the light receiving element 46 is disposed adjacent to the reflective photoelectric sensor 40a, and the red light from the light projecting element 41a is received. Even when the light receiving lens portion 48b of the reflection type photoelectric sensor 40b is irradiated, the red light is not transmitted, so that no light is received. Similarly, even when the green light from the light projecting element 41b of the reflective photoelectric sensor 40b is irradiated to the light receiving lens portion 48a of the reflective photoelectric sensor 40a, the green light is not transmitted. Therefore, even if the reflective photoelectric sensors 40a and 40b having such a configuration are arranged adjacent to each other, mutual interference can be reliably prevented.

図６（ｃ）において、受光レンズによる光選択方式を採用し、青色光に対応するように構成された反射型光電センサの説明図が示されている。同図において、基本的な構成は赤色光及び青色光に対応する図６（ａ）及び（ｂ）とほぼ同じであり、同一構成要素には同一符号を付与して説明を省略する。図６（ｃ）において、図６（ａ）及び（ｂ）との相違点は、投光素子４１ｃとして青色ＬＥＤを採用していることと、受光レンズ４８ｃが青色光に含まれる発光波長のみを透過し、その他の光は透過しない特性を有する材質によって構成されていることにある。そして、このような構成により、受光素子４６においては、投光素子４１ｃによって投光される青色光のみを受光し、例えば、反射型光電センサ４０ａ（又は４０ｂ）が隣接配置されていて、投光素子４１ａ（又は４１ｂ）からの赤色光（又は緑色光）が受光レンズ部４８ｃに照射されるような場合においても、これらの光は透過されない。同様に、反射型光電センサ４０ｃの投光素子４１ｃからの青色光が反射型光電センサ４０ａ（又は４０ｂ）の受光レンズ部４８ａ（又は４８ｂ）に照射されるような場合においても、この青色光は透過されない。そのため、これらの反射型光電センサ４０ａ、４０ｂ、及び４０ｃを隣接配置しても、相互干渉は確実に防ぐことが可能となる。   FIG. 6C shows an explanatory diagram of a reflective photoelectric sensor that adopts a light selection method using a light receiving lens and is configured to correspond to blue light. In this figure, the basic configuration is substantially the same as in FIGS. 6A and 6B corresponding to red light and blue light, and the same components are assigned the same reference numerals and description thereof is omitted. 6 (c) is different from FIGS. 6 (a) and 6 (b) in that a blue LED is used as the light projecting element 41c and that the light receiving lens 48c only emits light having a light emission wavelength included in the blue light. That is, it is made of a material having a characteristic of transmitting and not transmitting other light. With such a configuration, the light receiving element 46 receives only the blue light projected by the light projecting element 41c. For example, the reflective photoelectric sensor 40a (or 40b) is disposed adjacent to the light projecting element 41c. Even in the case where red light (or green light) from the element 41a (or 41b) is irradiated to the light receiving lens portion 48c, the light is not transmitted. Similarly, even when the blue light from the light projecting element 41c of the reflective photoelectric sensor 40c is irradiated to the light receiving lens portion 48a (or 48b) of the reflective photoelectric sensor 40a (or 40b), the blue light is Not transparent. Therefore, even if these reflective photoelectric sensors 40a, 40b, and 40c are arranged adjacent to each other, mutual interference can be reliably prevented.

また、透過型光電センサと同様に、受光レンズ４８ａ、ｂ、及びｃをそれぞれ所定の発光波長を有する光のみを透過する材質によって構成する代わりに、同様の光波長域選択手段を有するフィルタ板を受光用光学系に組み込むことによっても同様の効果が得られる。図７においてフィルタ板による光選択方式を採用した反射型光電センサの断面図が示されている。   Similarly to the transmissive photoelectric sensor, instead of forming the light receiving lenses 48a, b, and c with a material that transmits only light having a predetermined emission wavelength, a filter plate having the same light wavelength region selection means is provided. The same effect can be obtained by incorporating it in a light receiving optical system. FIG. 7 shows a sectional view of a reflective photoelectric sensor employing a light selection method using a filter plate.

図７（ａ）、（ｂ）、及び（ｃ）において、フィルタ板による光選択方式を採用した反射型光電センサの説明図がそれぞれ示されている。これらの図において、基本的な構成は受光レンズによる光選択方式を採用した図６（ａ）、（ｂ）、及び（ｃ）とほぼ同じであり、同一構成要素には同一符号を付与して説明を省略する。   7A, 7B, and 7C, there are shown explanatory diagrams of a reflective photoelectric sensor that employs a light selection method using a filter plate. In these figures, the basic configuration is almost the same as in FIGS. 6A, 6B, and 6C in which a light selection method using a light receiving lens is adopted, and the same reference numerals are given to the same components. Description is omitted.

図７（ａ）において、フィルタ板による光選択方式を採用し、赤色光に対応するように構成された反射型光電センサ５０ａの説明図が示されている。同図において、基本的な構成は受光レンズによる光選択方式を採用し、赤色光に対応するように構成された図６（ａ）とほぼ同じである。同図において、図６（ａ）との相違点は、受光レンズとしては光波長域選択手段を備えていない通常の受光レンズ４８が設置されており、遮光板の前面に赤色光に対応した光波長域選択手段を有するフィルタ板５１ａが設けられている点にある。これにより、投光素子４１ａから投光される赤色光は、遮光板４２及び投光レンズ４３を介して計測対象物体の表面に照射し、反射される光は受光レンズ４８を透過し、フィルタ板５１ａに照射する。   FIG. 7A shows an explanatory diagram of a reflective photoelectric sensor 50a that adopts a light selection method using a filter plate and is configured to correspond to red light. In this figure, the basic configuration is substantially the same as that shown in FIG. 6A, which employs a light selection system using a light receiving lens and is configured to support red light. In FIG. 6, the difference from FIG. 6A is that a light receiving lens is provided with a normal light receiving lens 48 that does not have a light wavelength range selection means, and light corresponding to red light is provided on the front surface of the light shielding plate. The filter plate 51a having the wavelength range selecting means is provided. Thereby, the red light projected from the light projecting element 41a irradiates the surface of the measurement target object via the light shielding plate 42 and the light projecting lens 43, and the reflected light is transmitted through the light receiving lens 48, and the filter plate. 51a is irradiated.

このとき、このフィルタ板５１ａは、赤色光対応構成とされているため、赤色光に含まれる光波長のみを透過し、それ以外の波長の光は透過させない特性を持つ材質によって構成される。そのため、フィルタ板５１ａに照射される光が、投光素子４１ａからの赤色光であれば、フィルタ板５１ａを透過し、遮光板４７に設けられたピンホールを介して受光素子４６にて受光される。一方、フィルタ板５１ａに照射される光が赤色光とは異なる波長を有する光であれば、フィルタ板５１ａを透過できず、受光素子４６によって受光されることはない。   At this time, since the filter plate 51a has a configuration corresponding to red light, the filter plate 51a is formed of a material having a characteristic of transmitting only light wavelengths included in red light and not transmitting light of other wavelengths. Therefore, if the light irradiated to the filter plate 51 a is red light from the light projecting element 41 a, the light passes through the filter plate 51 a and is received by the light receiving element 46 through the pinhole provided in the light shielding plate 47. The On the other hand, if the light applied to the filter plate 51a has a wavelength different from that of red light, the light cannot be transmitted through the filter plate 51a and is not received by the light receiving element 46.

図７（ｂ）において、フィルタ板による光選択方式を採用し、緑色光に対応するように構成された反射型光電センサ５０ｂの説明図が示されている。同図において、基本的な構成は受光レンズによる光選択方式を採用し、緑色光に対応するように構成された図６（ｂ）とほぼ同じである。同図において、図６（ｂ）との相違点は、受光レンズとしては光波長域選択手段を備えていない通常の受光レンズ４８が設置されており、遮光板の前面に緑色光に対応した光波長域選択手段を有するフィルタ板５１ｂが設けられている点にある。これにより、投光素子４１ｂから投光される緑色光は、遮光板４２及び投光レンズ４３を介して計測対象物体の表面に照射し、反射される光は受光レンズ４８を透過し、フィルタ板５１ｂに照射する。   FIG. 7B shows an explanatory diagram of a reflective photoelectric sensor 50b that adopts a light selection method using a filter plate and is configured to correspond to green light. In this figure, the basic configuration is substantially the same as that shown in FIG. 6B, which employs a light selection system using a light receiving lens and is configured to correspond to green light. In FIG. 6, the difference from FIG. 6B is that a normal light receiving lens 48 not provided with a light wavelength range selecting means is installed as a light receiving lens, and light corresponding to green light is provided on the front surface of the light shielding plate. The filter plate 51b having the wavelength range selecting means is provided. Thereby, the green light projected from the light projecting element 41b irradiates the surface of the measurement target object via the light shielding plate 42 and the light projecting lens 43, and the reflected light is transmitted through the light receiving lens 48, and the filter plate. 51b is irradiated.

このとき、このフィルタ板５１ｂは、緑色光対応構成とされているため、緑色光に含まれる光波長のみを透過し、それ以外の波長の光は透過させない特性を持つ材質によって構成される。そのため、フィルタ板５１ｂに照射される光が、投光素子４１ｂからの緑色光であれば、フィルタ板５１ｂを透過し、遮光板４７に設けられたピンホールを介して受光素子４６にて受光される。一方、フィルタ板５１ｂに照射される光が緑色光とは異なる波長を有する光であれば、フィルタ板５１ｂを透過できず、受光素子４６によって受光されることはない。   At this time, since the filter plate 51b has a configuration corresponding to the green light, the filter plate 51b is formed of a material having a characteristic of transmitting only the light wavelength included in the green light and not transmitting the light of other wavelengths. Therefore, if the light irradiated to the filter plate 51 b is green light from the light projecting element 41 b, it passes through the filter plate 51 b and is received by the light receiving element 46 through the pinhole provided in the light shielding plate 47. The On the other hand, if the light emitted to the filter plate 51b has a wavelength different from that of green light, the light cannot be transmitted through the filter plate 51b and is not received by the light receiving element 46.

図７（ｃ）において、フィルタ板による光選択方式を採用し、青色光に対応するように構成された反射型光電センサ５０ｃの説明図が示されている。同図において、基本的な構成は受光レンズによる光選択方式を採用し、青色光に対応するように構成された図６（ｃ）とほぼ同じである。同図において、図６（ｃ）との相違点は、受光レンズとしては光波長域選択手段を備えていない通常の受光レンズ４８が設置されており、遮光板の前面に青色光に対応した光波長域選択手段を有するフィルタ板５１ｃが設けられている点にある。これにより、投光素子４１ｂから投光される青色光は、遮光板４２及び投光レンズ４３を介して計測対象物体の表面に照射し、反射される光は受光レンズ４８を透過し、フィルタ板５１ｃに照射する。ここで、フィルタ板５１ｃは青色光に含まれる発光波長を透過させる特性を備えているので、投光素子４１ｃからの青色光はフィルタ板５１ｃを透過し、遮光板４７のピンホールを介して受光素子４６に入光する。   FIG. 7C illustrates an explanatory diagram of a reflective photoelectric sensor 50c that employs a light selection method using a filter plate and is configured to correspond to blue light. In this figure, the basic configuration is almost the same as that shown in FIG. 6C, which adopts a light selection method using a light receiving lens and is configured to support blue light. In FIG. 6, the difference from FIG. 6C is that a normal light receiving lens 48 not provided with a light wavelength range selecting means is installed as a light receiving lens, and light corresponding to blue light is provided on the front surface of the light shielding plate. The filter plate 51c having the wavelength range selection means is provided. Thereby, the blue light projected from the light projecting element 41b irradiates the surface of the measurement target object via the light shielding plate 42 and the light projecting lens 43, and the reflected light passes through the light receiving lens 48, and the filter plate. 51c is irradiated. Here, since the filter plate 51c has a characteristic of transmitting the emission wavelength included in the blue light, the blue light from the light projecting element 41c passes through the filter plate 51c and is received through the pinhole of the light shielding plate 47. The light enters the element 46.

図８において、本発明が適用された反射型実装センサの３連装配置状態が示されている。同図にて示されるように、反射型光電センサ４０ａ、４０ｂ、及び４０ｃ（又は５０ａ、５０ｂ、及び５０ｃ）が一列に隣接配置される。そして、計測対象であるワークＷは、これらの反射型光電センサ列の前面に規定される計測領域を同図中矢印Ａにて示される方向に移動する。   FIG. 8 shows a three-row arrangement state of a reflection type mounting sensor to which the present invention is applied. As shown in the figure, the reflective photoelectric sensors 40a, 40b, and 40c (or 50a, 50b, and 50c) are adjacently arranged in a line. And the workpiece | work W which is a measurement object moves the measurement area | region prescribed | regulated on the front surface of these reflective photoelectric sensor arrays in the direction shown by the arrow A in the same figure.

このとき、反射型光電センサ４０ａ（又は５０ａ）は赤色対応構造とされ、その投光用光学系において、赤色ＬＥＤが投光素子として用いられる。一方で、受光用光学系においては、赤色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、赤色光に含まれる発光波長のみ透過させる特性を有する受光レンズ（又はフィルタ板）を有している。   At this time, the reflective photoelectric sensor 40a (or 50a) has a red-compatible structure, and a red LED is used as a light projecting element in the light projecting optical system. On the other hand, the light receiving optical system includes a light receiving wavelength range selecting unit that transmits only the light emission wavelength included in the red LED. That is, it has a light receiving lens (or filter plate) having a characteristic of transmitting only the emission wavelength included in red light.

また、反射型光電センサ４０ｂ（又は５０ｂ）は緑色対応構造とされ、その投光用光学系においては、緑色ＬＥＤが投光素子として用いられる。一方で、受光用光学系においては、緑色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、緑色光に含まれる発光波長のみ透過させる特性を有する受光レンズ（又はフィルタ板）を有している。   The reflective photoelectric sensor 40b (or 50b) has a green-compatible structure, and a green LED is used as a light projecting element in the light projecting optical system. On the other hand, the light receiving optical system is provided with a light receiving wavelength range selecting means for transmitting only the light emission wavelength included in the green LED. That is, it has a light receiving lens (or filter plate) having a characteristic of transmitting only the emission wavelength included in the green light.

また、反射型光電センサ４０ｃ（又は５０ｃ）はそれぞれ青色対応構造とされ、その投光用光学系においては、青色ＬＥＤが投光素子として用いられる。一方で、受光用光学系においては、青色ＬＥＤに含まれる発光波長のみを透過させるような受光波長域選択手段を備える。すなわち、青色光に含まれる発光波長のみ透過させる特性を有する受光レンズ（又はフィルタ板）を有している。   Each of the reflective photoelectric sensors 40c (or 50c) has a blue-compatible structure, and a blue LED is used as a light projecting element in the light projecting optical system. On the other hand, the light receiving optical system includes a light receiving wavelength range selecting unit that transmits only the light emission wavelength included in the blue LED. That is, it has a light receiving lens (or filter plate) having a characteristic of transmitting only the emission wavelength contained in blue light.

このような構成により、赤色対応構成とされた反射型光電センサ４０ａ（又は５０ａ）においては、投光素子４１ａによって照射される赤色光のみを受光し、隣接配置される４０ｂ（又は５０ｂ）及び４０ｃ（又は５０ｃ）の投光素子４１ｂ及び４１ｃからの緑色光と青色光は、受光レンズ（又はフィルタ板）に備わる光波長域選択手段によって透過が阻まれ、受光素子において受光することはない。   With such a configuration, in the reflection type photoelectric sensor 40a (or 50a) configured for red, only the red light irradiated by the light projecting element 41a is received, and 40b (or 50b) and 40c arranged adjacent to each other. Transmission of green light and blue light from the light projecting elements 41b and 41c (or 50c) is blocked by the light wavelength range selection means provided in the light receiving lens (or filter plate), and is not received by the light receiving element.

同様に、緑色対応構成とされた反射型光電センサ４０ｂ（又は５０ｂ）においては、投光素子４１ｂによって照射される緑色光のみを受光し、隣接配置される４０ａ（又は５０ａ）及び４０ｃ（又は５０ｃ）の投光素子４１ａ及び４１ｃからの赤色光と青色光は、受光レンズ（又はフィルタ板）に備わる光波長域選択手段によって透過が阻まれ、受光素子において受光することはない。   Similarly, in the reflection type photoelectric sensor 40b (or 50b) having a green configuration, only the green light irradiated by the light projecting element 41b is received, and 40a (or 50a) and 40c (or 50c) arranged adjacent to each other. The red light and blue light from the light projecting elements 41a and 41c are prevented from being transmitted by the light wavelength range selecting means provided in the light receiving lens (or filter plate) and are not received by the light receiving elements.

同様に、青色対応構成とされた反射型光電センサ４０ｃ（又は５０ｃ）においては、投光素子４１ｃによって照射される青色光のみを受光し、隣接配置される４０ａ（又は５０ａ）及び４０ｂ（又は５０ｂ）の投光素子４１ａ及び４１ｂからの赤色光と緑色光は、受光レンズ（又はフィルタ板）に備わる光波長域選択手段によって透過が阻まれ、受光素子において受光することはない。   Similarly, in the reflection type photoelectric sensor 40c (or 50c) configured to correspond to the blue color, only the blue light irradiated by the light projecting element 41c is received, and 40a (or 50a) and 40b (or 50b) arranged adjacent to each other. Red light and green light from the light projecting elements 41a and 41b are prevented from being transmitted by the light wavelength range selecting means provided in the light receiving lens (or filter plate), and are not received by the light receiving elements.

このように、連装される光電センサにおいて、反射型光電センサ４０ａ、４０ｂ、及び４０ｃはそれぞれ異なる発光波長を有する光を投光し、その受光用光学系は予め対応付けられている所定の発光波長を有する光のみを受光する構造とされている。そして、それらの受光用光学系はそれぞれ所定の投光素子４１からの光のみを受光し、その他の光は受光しない。そのため、これらの反射型光電センサを隣接配置するような場合においても、隣接する光電センサ間の相互干渉を確実に防止することができる。   In this way, in the photoelectric sensors that are connected, the reflective photoelectric sensors 40a, 40b, and 40c project light having different emission wavelengths, and the light receiving optical system has a predetermined emission wavelength that is associated in advance. It is set as the structure which receives only the light which has. Each of these light receiving optical systems receives only light from a predetermined light projecting element 41 and does not receive other light. Therefore, even when these reflective photoelectric sensors are arranged adjacent to each other, mutual interference between adjacent photoelectric sensors can be reliably prevented.

受光レンズによる光選択方式の説明図（透過型）。Explanatory drawing of the light selection system by a light receiving lens (transmission type). フィルタ板による光選択方式の説明図（透過型）。Explanatory drawing of the light selection system by a filter board (transmission type). 発光素子及びフィルタ板の特性曲線を示す説明図。Explanatory drawing which shows the characteristic curve of a light emitting element and a filter board. 本発明の一実施例である受光器の断面図。Sectional drawing of the light receiver which is one Example of this invention. 本発明が適用された透過型光電センサの３連装配置状態を示す斜視図。The perspective view which shows the 3 continuous arrangement | positioning arrangement | positioning state of the transmission type photoelectric sensor to which this invention was applied. 受光レンズによる光選択方式の説明図（反射型）。Explanatory drawing of the light selection system by a light receiving lens (reflection type). フィルタ板による光選択方式の説明図（反射型）。Explanatory drawing of the light selection system by a filter board (reflection type). 本発明が適用された反射型光電センサの３連装配置状態を示す斜視図。The perspective view which shows the triple arrangement | positioning arrangement | positioning state of the reflection type photoelectric sensor to which this invention was applied. 従来の相互干渉防止対策の説明図（その１）。Explanatory drawing of the conventional mutual interference prevention measure (the 1). 従来の相互干渉防止対策の説明図（その２）。Explanatory drawing of the conventional mutual interference prevention measure (the 2).

符号の説明Explanation of symbols

１ａ、１ｂ 投光器
２ａ、２ｂ 受光器
３ａ、３ｂ 偏向フィルタ
４ 投光される光
５ 信号線
６ 同期光
１１ａ 赤色ＬＥＤ
１１ｂ 緑色ＬＥＤ
１１ｃ 青色ＬＥＤ
１２ 投光レンズ
１３ａ 受光レンズ（赤波長透過）
１３ｂ 受光レンズ（緑波長透過）
１３ｃ 受光レンズ（青波長透過）
１４ 受光素子
１５ａ フィルタ板（赤波長透過）
１５ｂ フィルタ板（緑波長透過）
１５ｃ フィルタ板（青波長透過）
２０ 投光器
２０ａ 投光器（赤色対応）
２０ｂ 投光器（緑色対応）
２０ｃ 投光器（青色対応）
２１ 受光器
２１ａ 受光器（赤色対応）
２１ｂ 受光器（緑色対応）
２１ｃ 受光器（青色対応）
３１ 前面板
３１ａ 受光レンズ部
３２ 後面板
３３ 回路基板
３４ ホルダブロック
３５ 空所
３６ 制御出力表示灯
３７ 操作ボタン
３８ 電気コード
３９ コードプロテクタ
４０ａ 受光レンズによる選択方式を採用した反射型光電センサ（赤色対応）
４０ｂ 受光レンズによる選択方式を採用した反射型光電センサ（緑色対応）
４０ｃ 受光レンズによる選択方式を採用した反射型光電センサ（青色対応）
４１ａ 赤色ＬＥＤ
４１ｂ 緑色ＬＥＤ
４１ｃ 青色ＬＥＤ
４２ 遮光板
４３ 投光レンズ部
４４ 回路基板
４５ ホルダ
４６ 受光素子
４７ 遮光板
４８ 受光レンズ部
４８ａ 受光レンズ部（赤波長透過）
４８ｂ 受光レンズ部（緑波長透過）
４８ｃ 受光レンズ部（青波長透過）
４９ 前面板
５０ａ フィルタ板による選択方式を採用した反射型光電センサ（赤色対応）
５０ｂ フィルタ板による選択方式を採用した反射型光電センサ（緑色対応）
５０ｃ フィルタ板による選択方式を採用した反射型光電センサ（青色対応）
５１ａ フィルタ板（赤波長透過）
５１ｂ フィルタ板（緑波長透過）
５１ｃ フィルタ板（青波長透過）
５５ａ、ｂ 取付穴
Ｗ ワーク 1a, 1b Projector 2a, 2b Receiver 3a, 3b Deflection filter 4 Light to be projected 5 Signal line 6 Synchronous light 11a Red LED
11b Green LED
11c Blue LED
12 Emitting lens 13a Receiving lens (Red wavelength transmission)
13b Light receiving lens (Green wavelength transmission)
13c Light receiving lens (blue wavelength transmission)
14 Light receiving element 15a Filter plate (Red wavelength transmission)
15b Filter plate (Green wavelength transmission)
15c filter plate (blue wavelength transmission)
20 Floodlight 20a Floodlight (red)
20b Floodlight (green)
20c Floodlight (blue)
21 Receiver 21a Receiver (for red)
21b Receiver (green)
21c Receiver (blue)
31 Front plate 31a Receiving lens unit 32 Rear plate 33 Circuit board 34 Holder block 35 Space 36 Control output indicator 37 Operation button 38 Electrical code 39 Code protector 40a Reflective photoelectric sensor adopting a selection method using a light receiving lens (for red)
40b Reflection type photoelectric sensor (selection for green) that uses a selection system with a light-receiving lens
40c Reflective photoelectric sensor (selection for blue color) adopting a selection method using a light receiving lens
41a Red LED
41b Green LED
41c Blue LED
42 light shielding plate 43 light projecting lens portion 44 circuit board 45 holder 46 light receiving element 47 light shielding plate 48 light receiving lens portion 48a light receiving lens portion (red wavelength transmission)
48b Light-receiving lens (green wavelength transmission)
48c Receiving lens (blue wavelength transmission)
49 Front plate 50a Reflection type photoelectric sensor using a filter plate selection method (red)
50b Reflective photoelectric sensor using a filter plate selection method (green)
50c Reflective photoelectric sensor using a filter plate selection method (blue)
51a Filter plate (Red wavelength transmission)
51b Filter plate (Green wavelength transmission)
51c Filter plate (blue wavelength transmission)
55a, b Mounting hole W Workpiece

Claims (12)

投光器と受光器とを有する第１の透過型光電センサと、
投光器と受光器とを有する第２の透過型光電センサとを含み、
第１の透過型光電センサの投光器は、
第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を投光するように構成され、かつ
第１の透過型光電センサの受光器は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第２の透過型光電センサの投光器は、
第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を投光するように構成され、かつ
第２の透過型光電センサの受光器は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する、
ことを特徴とする透過型光電センサシステム。 A first transmissive photoelectric sensor having a projector and a light receiver;
A second transmissive photoelectric sensor having a projector and a light receiver,
The projector of the first transmission photoelectric sensor is
It is configured to project light including the first light wavelength band component and not including the second light wavelength band component, and the light receiver of the first transmission photoelectric sensor includes the first light wavelength band component. Including light receiving wavelength range selection means for receiving light that does not include the second light wavelength range component,
The projector of the second transmissive photoelectric sensor is
The second transmissive photoelectric sensor is configured to project light including the second optical wavelength band component and not including the first optical wavelength band component, and the second transmissive photoelectric sensor includes a second optical wavelength band component. And receiving light wavelength range selection means for receiving light that does not contain the first light wavelength range component,
A transmission type photoelectric sensor system characterized by the above. 投光器と受光器とを有する第１の透過型光電センサと、
投光器と受光器とを有する第２の透過型光電センサと、
投光器と受光器とを有する第３の透過型光電センサとを含み、
第１の透過型光電センサの投光器は、
第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を投光するように構成され、かつ
第１の透過型光電センサの受光器は、
第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第２の透過型光電センサの投光器は、
第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を投光するように構成され、かつ
第２の透過型光電センサの受光器は、
第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第３の透過型光電センサの投光器は、
第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を投光するように構成され、かつ
第３の透過型光電センサの受光器は、
第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する、
ことを特徴とする透過型光電センサシステム。 A first transmissive photoelectric sensor having a projector and a light receiver;
A second transmissive photoelectric sensor having a projector and a light receiver;
A third transmissive photoelectric sensor having a projector and a light receiver,
The projector of the first transmission photoelectric sensor is
The first transmissive photoelectric sensor is configured to project light including the first light wavelength band component and not including the second and third light wavelength band components.
A light receiving wavelength band selecting means for receiving light including the first light wavelength band component and not including the second and third light wavelength band components;
The projector of the second transmissive photoelectric sensor is
The second transmissive photoelectric sensor is configured to project light including the second light wavelength band component and not including the first and third light wavelength band components,
A light receiving wavelength band selecting means for receiving light including the second light wavelength band component and not including the first and third light wavelength band components;
The projector of the third transmissive photoelectric sensor is
It is configured to project light that includes the third light wavelength band component and does not include the first and second light wavelength band components, and the receiver of the third transmission photoelectric sensor includes:
A light receiving wavelength range selecting means for receiving light including the third optical wavelength range component and not including the first and second optical wavelength range components;
A transmission type photoelectric sensor system characterized by the above. 受光波長域選択手段が、それぞれ目的とする光波長域選択通過特性を有するように材質を選択された受光レンズである、
ことを特徴とする請求項１又は２に記載の透過型光電センサシステム。 The light receiving wavelength range selecting means is a light receiving lens whose material is selected so as to have a desired light wavelength range selective transmission characteristic, respectively.
The transmission photoelectric sensor system according to claim 1 or 2, 受光波長域選択手段が、受光レンズと受光素子との間に介在され、かつ目的とする光波長域選択通過特性を有する光学フィルタである、
ことを特徴とする請求項１又は２に記載の透過型光電センサシステム。 The light receiving wavelength range selecting means is an optical filter that is interposed between the light receiving lens and the light receiving element and has a desired light wavelength range selective pass characteristic.
The transmission photoelectric sensor system according to claim 1 or 2, 各投光器内には、それぞれ目的とする投光の光波長域特性に符合する発光波長特性を有する投光素子が内蔵されている、ことを特徴とする請求項１〜４のいずれかに記載の透過型光電センサシステム。   5. The projector according to claim 1, wherein each projector has a built-in light projecting element having a light emission wavelength characteristic that matches a light wavelength range characteristic of a target light project. Transmission type photoelectric sensor system. 投光素子より投光される光が可視光線である、ことを特徴とする請求項１〜５のいずれかに記載の透過型光電センサシステム。   The transmissive photoelectric sensor system according to claim 1, wherein light projected from the light projecting element is visible light. 投光部と受光部とを有する第１の反射型光電センサと、
投光部と受光部とを有する第２の反射型光電センサとを含み、
第１の反射型光電センサの投光部は、
第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を投光するように構成され、かつ
第１の反射型光電センサの受光部は、第１の光波長域成分を含みかつ第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第２の反射型光電センサの投光部は、
第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を投光するように構成され、かつ
第２の反射型光電センサの受光部は、第２の光波長域成分を含みかつ第１の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する、
ことを特徴とする反射型光電センサシステム。 A first reflective photoelectric sensor having a light projecting unit and a light receiving unit;
A second reflective photoelectric sensor having a light projecting part and a light receiving part,
The light projecting portion of the first reflective photoelectric sensor is
The light receiving unit of the first reflective photoelectric sensor is configured to project light including the first light wavelength band component and not including the second light wavelength band component. Including light receiving wavelength range selection means for receiving light that does not include the second light wavelength range component,
The light projecting portion of the second reflective photoelectric sensor is
The light receiving unit of the second reflective photoelectric sensor is configured to project light including the second light wavelength band component and not including the first light wavelength band component, and the second reflection wavelength sensor includes the second light wavelength band component. And receiving light wavelength range selection means for receiving light that does not contain the first light wavelength range component,
A reflective photoelectric sensor system characterized by that. 投光部と受光部とを有する第１の反射型光電センサと、
投光部と受光部とを有する第２の反射型光電センサと、
投光部と受光部とを有する第３の反射型光電センサとを含み、
第１の反射型光電センサの投光部は、
第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を投光するように構成され、かつ
第１の反射型光電センサの受光部は、
第１の光波長域成分を含みかつ第２及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第２の反射型光電センサの投光部は、
第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を投光するように構成され、かつ
第２の反射型光電センサの受光部は、
第２の光波長域成分を含みかつ第１及び第３の光波長域成分を含まない光を受光するために受光波長域選択手段を具備し、
第３の反射型光電センサの投光部は、
第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を投光するように構成され、かつ
第３の反射型光電センサの受光部は、
第３の光波長域成分を含みかつ第１及び第２の光波長域成分を含まない光を受光するために受光波長域選択手段を具備する、
ことを特徴とする反射型光電センサシステム。 A first reflective photoelectric sensor having a light projecting unit and a light receiving unit;
A second reflective photoelectric sensor having a light projecting unit and a light receiving unit;
A third reflective photoelectric sensor having a light projecting part and a light receiving part,
The light projecting portion of the first reflective photoelectric sensor is
The light receiving unit of the first reflective photoelectric sensor is configured to project light including the first light wavelength band component and not including the second and third light wavelength band components.
A light receiving wavelength band selecting means for receiving light including the first light wavelength band component and not including the second and third light wavelength band components;
The light projecting portion of the second reflective photoelectric sensor is
The light receiving unit of the second reflective photoelectric sensor is configured to project light including the second light wavelength band component and not including the first and third light wavelength band components,
A light receiving wavelength band selecting means for receiving light including the second light wavelength band component and not including the first and third light wavelength band components;
The light projecting portion of the third reflective photoelectric sensor is
The light receiving unit of the third reflective photoelectric sensor is configured to project light including the third light wavelength band component and not including the first and second light wavelength band components,
A light receiving wavelength range selecting means for receiving light including the third optical wavelength range component and not including the first and second optical wavelength range components;
A reflective photoelectric sensor system characterized by that. 受光波長域選択手段が、それぞれ目的とする光波長域選択通過特性を有するように材質を選択された受光レンズである、
ことを特徴とする請求項７又は８に記載の反射型光電センサシステム。 The light receiving wavelength range selecting means is a light receiving lens whose material is selected so as to have a desired light wavelength range selective transmission characteristic, respectively.
The reflective photoelectric sensor system according to claim 7 or 8, characterized in that: 受光波長域選択手段が、受光レンズと受光素子との間に介在され、かつ目的とする光波長域選択通過特性を有する光学フィルタである、
ことを特徴とする請求項７又は８に記載の反射型光電センサシステム。 The light receiving wavelength range selecting means is an optical filter that is interposed between the light receiving lens and the light receiving element and has a desired light wavelength range selective pass characteristic.
The reflective photoelectric sensor system according to claim 7 or 8, characterized in that: 各投光器内には、それぞれ目的とする投光の光波長域特性に符合する発光周波数特性を有する投光素子が内蔵されている、ことを特徴とする請求項７〜１０のいずれかに記載の反射型光電センサシステム。   The light projecting element which has the light emission frequency characteristic corresponding to the light wavelength range characteristic of the target light projection is incorporated in each light projector, respectively. Reflective photoelectric sensor system. 投光素子より投光される光が可視光線である、ことを特徴とする請求項７〜１１に記載の反射型光電センサシステム。   The reflective photoelectric sensor system according to claim 7, wherein the light projected from the light projecting element is visible light.
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KR101169457B1 (en) * 2010-05-31 2012-07-27 (주)휴엔텍 Elevator Button device using optical and electrical filters
JP2014096697A (en) * 2012-11-09 2014-05-22 Omron Corp Sensor system
JP2019078575A (en) * 2017-10-20 2019-05-23 大日本印刷株式会社 Detector, detection system, and wavelength selection element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0528890A (en) * 1991-07-25 1993-02-05 Smc Corp Switch device
JPH10312732A (en) * 1997-05-13 1998-11-24 Omron Corp Photoelectric switch
JP2000322989A (en) * 1999-05-14 2000-11-24 Omron Corp Photoelectric sensor and its manufacture
JP2002139605A (en) * 2000-11-02 2002-05-17 Matsushita Electric Ind Co Ltd Filter lens, method for manufacturing the same and photographing device equipped with filter lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0528890A (en) * 1991-07-25 1993-02-05 Smc Corp Switch device
JPH10312732A (en) * 1997-05-13 1998-11-24 Omron Corp Photoelectric switch
JP2000322989A (en) * 1999-05-14 2000-11-24 Omron Corp Photoelectric sensor and its manufacture
JP2002139605A (en) * 2000-11-02 2002-05-17 Matsushita Electric Ind Co Ltd Filter lens, method for manufacturing the same and photographing device equipped with filter lens

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027615A (en) * 2009-09-18 2010-02-04 Ccs Inc Light irradiation apparatus for test
JP2011103187A (en) * 2009-11-10 2011-05-26 Omron Corp Photoelectric sensor
US8890054B2 (en) 2009-11-10 2014-11-18 Omron Corporation Photoelectric sensor used for detection of thin objects
KR101169457B1 (en) * 2010-05-31 2012-07-27 (주)휴엔텍 Elevator Button device using optical and electrical filters
JP2012108079A (en) * 2010-11-19 2012-06-07 Yamatake Corp Photoelectronic sensor
JP2014096697A (en) * 2012-11-09 2014-05-22 Omron Corp Sensor system
JP2019078575A (en) * 2017-10-20 2019-05-23 大日本印刷株式会社 Detector, detection system, and wavelength selection element
JP7155504B2 (en) 2017-10-20 2022-10-19 大日本印刷株式会社 detection system, wavelength selective element

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