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JP5898020B2 - Photoelectric sensor - Google Patents
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JP5898020B2 - Photoelectric sensor - Google Patents

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JP5898020B2
JP5898020B2 JP2012190753A JP2012190753A JP5898020B2 JP 5898020 B2 JP5898020 B2 JP 5898020B2 JP 2012190753 A JP2012190753 A JP 2012190753A JP 2012190753 A JP2012190753 A JP 2012190753A JP 5898020 B2 JP5898020 B2 JP 5898020B2
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light emitting
emitting element
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JP2014049264A (en
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英有 蒲池
英有 蒲池
陵 中島
陵 中島
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Honda Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は投光部と受光部とからなる光電センサに関する。   The present invention relates to a photoelectric sensor including a light projecting unit and a light receiving unit.

図３に示すように、発光素子１０１を備える投光部１０２と、発光素子１０１から発射される光１０３を受光する受光素子１０４を備える受光部１０５とを有し、この受光部１０５の受光素子１０４への入光の有無で投光部１０２と受光部１０５との間に物体が存在しないか否かを識別する光電センサ１００が、実用に供されている。   As shown in FIG. 3, a light projecting unit 102 including a light emitting element 101 and a light receiving unit 105 including a light receiving element 104 that receives light 103 emitted from the light emitting element 101 are provided. A photoelectric sensor 100 that identifies whether or not an object exists between the light projecting unit 102 and the light receiving unit 105 based on whether or not light enters the light source 104 is put into practical use.

光電センサ１００は、電源制御ユニット１１０により制御される。
電源制御ユニット１１０は、受光素子１０４で発生する受信信号を増幅する増幅回路１１１や、増幅された電気信号を処理する諸回路１１２や、出力回路１１３を備えると共に、投光部１０２へ電気エネルギーを供給すると共に、電源制御ユニット１１０内の各回路１１１、１１２、１１３へ電気エネルギーを供給する電源回路１１５を備える。 The photoelectric sensor 100 is controlled by the power supply control unit 110.
The power supply control unit 110 includes an amplifier circuit 111 that amplifies a reception signal generated by the light receiving element 104, various circuits 112 that process the amplified electric signal, and an output circuit 113, and supplies electric energy to the light projecting unit 102. A power supply circuit 115 that supplies electric energy to the circuits 111, 112, and 113 in the power supply control unit 110 is provided.

具体的には、電源制御ユニット１１０から投光部１０２へ給電配線１１６が延ばされ、受光部１０５から電源制御ユニット１１０へ信号配線１１７が延ばされる。   Specifically, the power supply wiring 116 is extended from the power supply control unit 110 to the light projecting unit 102, and the signal wiring 117 is extended from the light receiving unit 105 to the power supply control unit 110.

投光部１０２と受光部１０５との間を物体（対象物）が通過する。この対象物に干渉しないように、給電配線１１６を敷設する必要がある。多くは、床や壁や天井に沿わせるように敷設する。対象物を大きく迂回させるため、投光部１０２と受光部１０５との距離に比較して、給電配線１１６が長くなる。結果、配線工事が繁雑になり、工事費用も嵩む。   An object (object) passes between the light projecting unit 102 and the light receiving unit 105. It is necessary to lay the power supply wiring 116 so as not to interfere with the object. Many are laid along the floor, walls, and ceiling. In order to largely detour the object, the power supply wiring 116 becomes longer than the distance between the light projecting unit 102 and the light receiving unit 105. As a result, the wiring work becomes complicated and the construction cost increases.

そこで、給電配線１１６を省くことができる光電センサ（システム）が、各種提案されている（例えば、特許文献１（第１図）参照。）。   Various photoelectric sensors (systems) that can omit the power supply wiring 116 have been proposed (see, for example, Patent Document 1 (FIG. 1)).

特許文献１を次図に基づいて説明する。
図４に示されるように、投光部１０２に、太陽電池１１９が付属されている。
太陽電池１１９は、周辺光１１８を受け、光エネルギーを電気エネルギーに変換し、この電気エネルギーで発光素子１０１を発光させる。結果、給電配線を省くことができる。 Patent document 1 is demonstrated based on the following figure.
As shown in FIG. 4, the light projecting portion 102, the solar cell 11 9 is included.
Solar cells 11 9 receives ambient light 118, converts light energy into electrical energy, thereby the light emitting element 101 in the electric energy. As a result, the power supply wiring can be omitted.

投光部１０２は、屋外に配置される場合は、太陽光を受けるが、曇りや雨天、夜間は使用困難となり、使用が著しく制限される。
または、投光部１０２は、いわゆる工場の建屋内に配置され、蛍光灯の光を受けて作動する。建屋内は明るいとは言えず、受光量を確保するために、太陽電池１１７を大型化して受光面積を増大する必要がある。投光部１０２が大型になり、コストも嵩む。
すなわち、特許文献１の光電センサでは、周辺光の状態に左右され、実使用上の障害が多い。結果、採用率が低くなる。 When the light projecting unit 102 is placed outdoors, it receives sunlight, but it is difficult to use in cloudy weather, rainy weather, and nighttime, and its use is significantly limited.
Or the light projection part 102 is arrange | positioned in what is called the building of a factory, and receives the light of a fluorescent lamp, and operate | moves. It cannot be said that the building is bright, and in order to secure the amount of light received, it is necessary to increase the size of the solar cell 117 to increase the light receiving area. The light projecting unit 102 becomes large and the cost increases.
That is, the photoelectric sensor of Patent Document 1 depends on the state of ambient light, and there are many obstacles in actual use. As a result, the adoption rate is low.

実開平２−１２１３０号公報Japanese Utility Model Publication No. 2-12130

本発明は、太陽電池を備える光電センサにおいて、周辺光の影響を受けない技術を提供することを課題とする。   This invention makes it a subject to provide the technique which is not influenced by ambient light in a photoelectric sensor provided with a solar cell.

請求項１に係る発明は、発光素子を備える投光部と、前記発光素子から発射される光を受光する受光素子を備える受光部と、電源回路を備え前記投光部及び前記発光素子を制御する電源制御ユニットを有し、
前記受光素子への入光の有無で前記投光部と前記受光部との間に物体が存在しないか否かを識別する光電センサにおいて、
前記受光部側に配置され前記電源回路から給電されてレーザ光を発射するレーザ発光手段と、前記投光部側に配置され前記レーザ光を受光し電気エネルギーに変換し前記投光部へ給電する太陽電池と、前記投光部側に配置され前記太陽電池で発生する電気エネルギーを貯えると共に前記発光素子へ給電する蓄電手段とを備えており、
前記太陽電池は、前記物体が存在するときに前記レーザ光が前記物体で遮断される位置に設けられ、前記物体で前記レーザ光が遮断されたときには、前記蓄電手段から前記発光素子に給電させるようにしたことを特徴とする。 The invention according to claim 1 includes a light projecting unit including a light emitting element, a light receiving unit including a light receiving element that receives light emitted from the light emitting element, a power supply circuit, and controlling the light projecting unit and the light emitting element. the power control unit to possess,
In the photoelectric sensor for identifying whether or not there is an object between the light projecting unit and the light receiving unit based on whether light is incident on the light receiving element ,
Laser light emitting means that is arranged on the light receiving unit side and is supplied with power from the power supply circuit and emits laser light; and laser light emitting means that is arranged on the light projecting unit side to receive the laser light, convert it into electrical energy, and supply power to the light projecting unit A solar cell, and a power storage means that is disposed on the light projecting unit side and stores electrical energy generated by the solar cell and supplies power to the light emitting element,
The solar cell is provided at a position where the laser beam is blocked by the object when the object is present, and when the laser beam is blocked by the object, power is supplied from the power storage unit to the light emitting element. characterized in that the.

請求項２に係る発明では、発光素子と太陽電池セルが共通の筐体に組み込まれ、受光素子とレーザ発光手段が共通の筐体に組み込まれていることを特徴とする。   The invention according to claim 2 is characterized in that the light emitting element and the solar battery cell are incorporated in a common casing, and the light receiving element and the laser light emitting means are incorporated in a common casing.

請求項１に係る発明では、レーザ光を太陽電池に照射する。太陽電池で発光素子に給電する。レーザ光は、周辺光（太陽光や蛍光灯の光）に比較して、格段に強力であり、太陽電池の受光面積を小さくすることができる。格段に強力であるため、周辺光の影響を受けない。
また、物体（対象物）が光を遮る際に、レーザ光も遮断される。このときには、蓄電手段の蓄電量が一定のレベルに下がるまで蓄電手段から発光素子に給電が継続される。
加えて、蓄電手段を備えているため、一定時間内であれば、レーザ光が遮断されることは許容される。結果、発光素子に接近して太陽電池を配置し、受光素子に接近してレーザ発光手段を配置することができ、構成要素のレイアウト自由度が高まる。 In the invention which concerns on Claim 1, a laser beam is irradiated to a solar cell. Electric power is supplied to the light emitting element by a solar cell. Laser light is much stronger than ambient light (sunlight or fluorescent light), and the light receiving area of the solar cell can be reduced. Because it is extremely powerful, it is not affected by ambient light.
Further, when the object (object) blocks light, the laser beam is also blocked. At this time, power feeding from the power storage means to the light emitting element is continued until the amount of power stored in the power storage means falls to a certain level.
In addition, since the power storage means is provided, the laser beam is allowed to be blocked within a certain time. As a result, the solar cell can be arranged close to the light emitting element, and the laser light emitting means can be arranged close to the light receiving element, and the layout flexibility of the constituent elements can be increased.

請求項２に係る発明では、発光素子と太陽電池セルが共通の筐体に組み込まれ、受光素子とレーザ発光手段が共通の筐体に組み込まれている。光電センサを従来品並の大きさに留めることができる。   In the invention which concerns on Claim 2, a light emitting element and a photovoltaic cell are integrated in the common housing | casing, and a light receiving element and a laser light emission means are integrated in the common housing | casing. The photoelectric sensor can be kept as large as a conventional product.

本発明に係る光電センサの構成図である。It is a block diagram of the photoelectric sensor which concerns on this invention. より好ましい光電センサの構成図である。It is a block diagram of a more preferable photoelectric sensor. 従来の光電センサの構成図である。It is a block diagram of the conventional photoelectric sensor. 特許文献１に記載されている光電センサの構成図である。It is a block diagram of the photoelectric sensor described in Patent Document 1.

本発明の実施の形態を添付図に基づいて以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１に示すように、本発明に係る光電センサ１０は、発光素子１１を備える投光部１２と、発光素子１１から発射される光１３を受光する受光素子１４を備える受光部１５とを有し、この受光部１５の受光素子１４への入光の有無で投光部１２と受光部１５との間に物体が存在しないか否かを識別する。   As shown in FIG. 1, the photoelectric sensor 10 according to the present invention includes a light projecting unit 12 including a light emitting element 11 and a light receiving unit 15 including a light receiving element 14 that receives light 13 emitted from the light emitting element 11. Whether or not an object exists between the light projecting unit 12 and the light receiving unit 15 is identified based on whether or not the light receiving unit 15 receives light to the light receiving element 14.

光電センサ１０は、電源制御ユニット２０により制御される。
電源制御ユニット２０は、受光素子１４で発生する受信信号を増幅する増幅回路２１や、増幅された電気信号を処理する諸回路２２や、出力回路２３を備えると共に、電源制御ユニット２０内の各回路２１、２２、２３等へ電気エネルギーを供給する電源回路２５を備える。受信信号は信号配線１６により増幅回路２１へ送られる。 The photoelectric sensor 10 is controlled by the power supply control unit 20.
The power supply control unit 20 includes an amplification circuit 21 that amplifies a reception signal generated by the light receiving element 14, various circuits 22 that process the amplified electric signal, and an output circuit 23, and each circuit in the power supply control unit 20. A power supply circuit 25 for supplying electric energy to 21, 22, 23 and the like is provided. The received signal is sent to the amplifier circuit 21 through the signal wiring 16.

さらに、電源制御ユニット２０は、外部（又は内部）に、レーザ発光手段２７を備える。このレーザ発光手段２７は配線２８を介して電源回路２５により給電され、レーザ光２９を発射する。   Further, the power supply control unit 20 includes a laser light emitting means 27 on the outside (or inside). The laser emission means 27 is fed by the power supply circuit 25 via the wiring 28 and emits a laser beam 29.

一方、投光部１２側に太陽電池３１が配置され、この太陽電池３１と発光素子１１とが配線３２で結ばれる。太陽電池３１はレーザ光２９の光軸上に配置される。好ましくは、配線３２に蓄電手段３３を介設する。   On the other hand, the solar cell 31 is disposed on the light projecting unit 12 side, and the solar cell 31 and the light emitting element 11 are connected by the wiring 32. The solar cell 31 is disposed on the optical axis of the laser beam 29. Preferably, power storage means 33 is interposed in the wiring 32.

電源回路２５から給電されたレーザ発光手段２７は電気エネルギーをレーザ光２９に変換する。レーザ光２９は太陽電池３１に照射され、太陽電池３１で電気エネルギーに変換される。変換された電気エネルギーが配線３２を介して蓄電手段３３に溜められる。そして、蓄電手段３３から発光素子１１に給電され、発光素子１１で光エネルギーに変換される。変換され発射される光１３は受光素子１４に入光される。   The laser light emitting means 27 fed from the power supply circuit 25 converts electric energy into laser light 29. The laser light 29 is applied to the solar cell 31 and is converted into electric energy by the solar cell 31. The converted electrical energy is stored in the power storage means 33 via the wiring 32. Then, power is supplied from the power storage means 33 to the light emitting element 11 and is converted into light energy by the light emitting element 11. The converted and emitted light 13 enters the light receiving element 14.

蛍光灯による光の強さより、太陽光の強さは、数倍から数十倍と言われている。そして、大陽光の強さより、レーザ光２９の強さは、数倍から数十倍と言われている。
すなわち、蛍光灯を光源とする場合に比較して、レーザ光２９を光源とする場合は、数十倍〜数百倍程度光を強めることができる。ただし、レーザ光２９は、太陽電池３１が破壊されないように、太陽電池３１で許容される光の強さに留める。 It is said that the intensity of sunlight is several to several tens of times greater than the intensity of light from fluorescent lamps. The intensity of the laser beam 29 is said to be several to several tens of times greater than the intensity of sun light.
That is, in the case where the laser light 29 is used as a light source, the light can be intensified by several tens to several hundred times as compared with the case where a fluorescent lamp is used as the light source. However, the laser light 29 is limited to the intensity of light allowed by the solar cell 31 so that the solar cell 31 is not destroyed.

それであっても、レーザ光２９は十分に強く、周辺光の影響を受ける心配はなく、且つ太陽電池３１の受光面積を大幅に小さくすることができ、太陽電池３１の小型化、低コスト化が可能となる。   Even so, the laser beam 29 is sufficiently strong, there is no fear of being affected by ambient light, and the light receiving area of the solar cell 31 can be greatly reduced, thereby reducing the size and cost of the solar cell 31. It becomes possible.

次に、レーザ光２９と太陽電池３１の相性を検討する。
太陽電池３１は、太陽光を対象に設計されている。太陽光は、白熱電球が発する白色光に近似し、波長が３８０ｎｍ（０．３８０μｍ）〜７８０ｎｍ（０．７８０μｍ）の可視光線、波長が３８０ｎｍ以下の紫外線、波長が１μｍ以上の赤外線の全て含んでいる。
蛍光灯は紫外線を主として発射するため、太陽電池３１で受光可能となる。 Next, the compatibility between the laser beam 29 and the solar cell 31 will be examined.
Solar battery 31 is designed for sunlight. Sunlight approximates white light emitted by incandescent bulbs, and includes all visible light having a wavelength of 380 nm (0.380 μm) to 780 nm (0.780 μm), ultraviolet light having a wavelength of 380 nm or less, and infrared light having a wavelength of 1 μm or more. Yes.
Since the fluorescent lamp mainly emits ultraviolet rays, the solar cell 31 can receive light.

一方、レーザは、波長が０．８μｍ又は１．５μｍの半導体レーザ、波長が０．６９μｍのルビーレーザ、波長が０．３２〜１．２μｍの色素レーザ、波長が１．０６４μｍのＹＡＧ（イットリウム・アルミニウム・ガーネット）レーザなどが、太陽光と近似し、太陽電池３１と相性がよい。全て固体物であるため、取扱いが容易で、小型化が図れる。
したがって、レーザ発光手段２７は、安価な市販品を採用することができる。
太陽電池３１も安価な市販品を採用することができる。 On the other hand, the laser is a semiconductor laser having a wavelength of 0.8 μm or 1.5 μm, a ruby laser having a wavelength of 0.69 μm, a dye laser having a wavelength of 0.32 to 1.2 μm, a YAG having a wavelength of 1.064 μm (yttrium. An aluminum garnet) laser or the like approximates to sunlight and is compatible with the solar cell 31. Since they are all solid, they are easy to handle and can be downsized.
Therefore, an inexpensive commercially available product can be used for the laser emission means 27.
The solar cell 31 can also employ an inexpensive commercial product.

次に、より好ましい実施例を説明する。
図２に示すように、投光部１２は柱状の筐体３５と、この筐体３５に取付けられる複数（この例では１０個）の発光素子１１と、筐体３５の下端（又は上端）に取付けられる太陽電池３１及び蓄電手段３３とからなる。
受光部１５も柱状の筐体３６、この筐体３６に取付けられる複数（この例では１０個）の受光素子１４と、筐体３６の下端（又は上端）に取付けられるレーザ発光手段２７とからなる。
図１で説明済みであるため、一部の配線は省略した。また、電源制御ユニット２０の説明も省略する。 Next, a more preferred embodiment will be described.
As shown in FIG. 2, the light projecting unit 12 includes a columnar housing 35, a plurality (10 in this example) of light emitting elements 11 attached to the housing 35, and a lower end (or upper end) of the housing 35. It consists of a solar cell 31 and power storage means 33 to be attached.
The light receiving unit 15 also includes a columnar housing 36, a plurality (10 in this example) of light receiving elements 14 attached to the housing 36, and laser light emitting means 27 attached to the lower end (or upper end) of the housing 36. .
Since it has already been described with reference to FIG. 1, some of the wiring is omitted. Further, the description of the power supply control unit 20 is also omitted.

物体（対象物）が光１３を遮る際に、レーザ光２９も遮断される。このときには、蓄電手段３３の蓄電量が一定のレベルに下がるまで蓄電手段３３から発光素子１１に給電が継続される。遮蔽物がなくなれば、直ちに大陽電池３１が発電を開始し、蓄電手段３３に給電する。   When the object (object) blocks the light 13, the laser beam 29 is also blocked. At this time, power supply from the power storage unit 33 to the light emitting element 11 is continued until the amount of power stored in the power storage unit 33 falls to a certain level. As soon as the shield disappears, the Taiyo battery 31 immediately starts power generation and supplies power to the power storage means 33.

太陽電池３１を発光素子１１に接近させて配置することができるため、筐体３５に発光素子１１と太陽電池３１を一括取付けることが可能となった。
同様に、レーザ発光手段２７を受光素子１４に接近させて配置することができるため、筐体３６に受光素子１４とレーザ発光手段２７を一括取付けることが可能となった。 Since the solar cell 31 can be disposed close to the light emitting element 11, the light emitting element 11 and the solar cell 31 can be collectively attached to the housing 35.
Similarly, since the laser light emitting means 27 can be disposed close to the light receiving element 14, it is possible to attach the light receiving element 14 and the laser light emitting means 27 to the housing 36 at once.

無論、図１のように、投光部１２と太陽電池３１を分離配置し、受光部１５とレーザ発光手段２７を分離配置することは差し支えない。
また、蓄電手段３３は設けることが望まれるが、省くことは差し支えない。 Of course, as shown in FIG. 1, the light projecting unit 12 and the solar cell 31 may be separately disposed, and the light receiving unit 15 and the laser light emitting means 27 may be separately disposed.
Further, although it is desirable to provide the power storage means 33, it can be omitted.

本発明は、投光部と受光部とに配線を渡さないようにした光電センサに好適である。   The present invention is suitable for a photoelectric sensor in which wiring is not passed between the light projecting unit and the light receiving unit.

１０…光電センサ、１１…発光素子、１２…投光部、１３…光、１４…受光素子、１５…受光部、２０…電源制御ユニット、２５…電源回路、２７…レーザ発光手段、２９…レーザ光、３１…太陽電池、３３…蓄電手段、３５、３６…筐体。   DESCRIPTION OF SYMBOLS 10 ... Photoelectric sensor, 11 ... Light emitting element, 12 ... Light emitting part, 13 ... Light, 14 ... Light receiving element, 15 ... Light receiving part, 20 ... Power supply control unit, 25 ... Power supply circuit, 27 ... Laser light emission means, 29 ... Laser Light, 31 ... solar cell, 33 ... power storage means, 35, 36 ... casing.

Claims (2)

発光素子を備える投光部と、
前記発光素子から発射される光を受光する受光素子を備える受光部と、
電源回路を備え前記投光部及び前記発光素子を制御する電源制御ユニットを有し、
前記受光素子への入光の有無で前記投光部と前記受光部との間に物体が存在しないか否かを識別する光電センサにおいて、
前記受光部側に配置され前記電源回路から給電されてレーザ光を発射するレーザ発光手段と、
前記投光部側に配置され前記レーザ光を受光し電気エネルギーに変換し前記投光部へ給電する太陽電池と、
前記投光部側に配置され前記太陽電池で発生する電気エネルギーを貯えると共に前記発光素子へ給電する蓄電手段とを備えており、
前記太陽電池は、前記物体が存在するときに前記レーザ光が前記物体で遮断される位置に設けられ、
前記物体で前記レーザ光が遮断されたときには、前記蓄電手段から前記発光素子に給電させるようにしたことを特徴とする光電センサ。 A light projecting unit comprising a light emitting element;
A light receiving unit including a light receiving element that receives light emitted from the light emitting element;
The light projecting unit comprises a power supply circuit and have a power control unit for controlling the light emitting element,
In the photoelectric sensor for identifying whether or not there is an object between the light projecting unit and the light receiving unit based on whether light is incident on the light receiving element ,
Laser light emitting means arranged on the light receiving unit side and fed with power from the power supply circuit to emit laser light;
A solar cell that is disposed on the light projecting unit side, receives the laser light, converts it into electrical energy, and supplies power to the light projecting unit ;
A power storage means disposed on the light projecting unit side for storing electrical energy generated by the solar cell and supplying power to the light emitting element;
The solar cell is provided at a position where the laser beam is blocked by the object when the object exists,
A photoelectric sensor , wherein when the laser beam is blocked by the object, power is supplied from the power storage means to the light emitting element . 前記発光素子と前記太陽電池セルが共通の筐体に組み込まれ、前記受光素子と前記レーザ発光手段が共通の筐体に組み込まれていることを特徴とする請求項１記載の光電センサ。   The photoelectric sensor according to claim 1, wherein the light emitting element and the solar battery cell are incorporated in a common casing, and the light receiving element and the laser light emitting means are incorporated in a common casing.
JP2012190753A 2012-08-31 2012-08-31 Photoelectric sensor Expired - Fee Related JP5898020B2 (en)

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