JP7085885B2 - Photoelectric sensor - Google Patents

Photoelectric sensor Download PDF

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JP7085885B2
JP7085885B2 JP2018086257A JP2018086257A JP7085885B2 JP 7085885 B2 JP7085885 B2 JP 7085885B2 JP 2018086257 A JP2018086257 A JP 2018086257A JP 2018086257 A JP2018086257 A JP 2018086257A JP 7085885 B2 JP7085885 B2 JP 7085885B2
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JP2019193183A (en
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貴之 細井
知広 高宮
実 田中
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Azbil Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
    • G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells

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  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
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  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

この発明は、検出体による反射光を受光する光電センサに関する。 The present invention relates to a photoelectric sensor that receives light reflected by a detector.

従来から、投光素子が赤外光を発光する光電センサが知られている（例えば特許文献１参照）。赤外光は、可視光（赤色光）に対して発光効率が高く検出性能がよいため、光電センサに用いられることがある。しかしながら、投光素子が赤外光を発光する場合、その発光された光及び検出体に当たった光を目視することはできない。 Conventionally, a photoelectric sensor in which a light projecting element emits infrared light has been known (see, for example, Patent Document 1). Infrared light is sometimes used for photoelectric sensors because it has high luminous efficiency and good detection performance with respect to visible light (red light). However, when the light projecting element emits infrared light, the emitted light and the light hitting the detector cannot be visually recognized.

そこで、従来から、赤外光を発光する赤外光用の投光素子に加え、可視光を発光する可視光用の投光素子を備えた光電センサが知られている（例えば特許文献２，３参照）。特許文献２に開示された光電センサでは、可視光用の投光素子が、赤外光用の投光素子に対して着脱可能に構成されている。また、特許文献３に開示された光電センサでは、基板上に赤外光用の投光素子と可視光用の投光素子とが並べて配置され、この２つの投光素子に対して単一の投光レンズを共通に用いている。 Therefore, conventionally, a photoelectric sensor including a light projecting element for visible light that emits visible light in addition to a light projecting element for infrared light that emits infrared light has been known (for example, Patent Document 2 and 2). 3). In the photoelectric sensor disclosed in Patent Document 2, the light projecting element for visible light is configured to be detachable from the light projecting element for infrared light. Further, in the photoelectric sensor disclosed in Patent Document 3, a light projecting element for infrared light and a light projecting element for visible light are arranged side by side on a substrate, and a single light projecting element is provided for these two light projecting elements. A floodlight lens is commonly used.

特開２０１２－７４４１２号公報Japanese Unexamined Patent Publication No. 2012-74412 特開平０５－６２５７３号公報Japanese Unexamined Patent Publication No. 05-62573 特開平０５－２７４９６７号公報Japanese Unexamined Patent Publication No. 05-274967

しかしながら、特許文献２に開示された従来の光電センサでは、赤外光用の投光素子と可視光用の投光素子とが別体の構造物に設けられているため、赤外光用の投光素子の光軸と可視光用の投光素子の光軸との間にずれが発生する。
また、特許文献３に開示された従来の光電センサでは、赤外光用の投光素子と可視光用の投光素子に対して単一の投光レンズが共通に用いられているため、赤外光用の投光素子の光軸と可視光用の投光素子の光軸との間にずれが発生する。すなわち、赤外光用の投光素子用に最適化された投光レンズを用いた場合、基板上に赤外光用の投光素子と可視光用の投光素子とを並べて配置すると、赤外光用の投光素子と投光レンズの中心とを通る軸と、可視光用の投光素子と投光レンズの中心とを通る軸が平行ではなくなり、光軸ずれが発生する。 However, in the conventional photoelectric sensor disclosed in Patent Document 2, since the light projecting element for infrared light and the light projecting element for visible light are provided in separate structures, they are used for infrared light. A deviation occurs between the optical axis of the light projecting element and the optical axis of the light projecting element for visible light.
Further, in the conventional photoelectric sensor disclosed in Patent Document 3, since a single light projecting lens is commonly used for the light projecting element for infrared light and the light projecting element for visible light, it is red. A deviation occurs between the optical axis of the light projecting element for external light and the optical axis of the light projecting element for visible light. That is, when a light projecting lens optimized for an infrared light projecting element is used, when the infrared light projecting element and the visible light projecting element are arranged side by side on the substrate, it is red. The axis passing through the center of the light projecting element for external light and the center of the light projecting lens and the axis passing through the center of the light projecting element for visible light and the center of the light projecting lens are not parallel, and an optical axis shift occurs.

この発明は、上記のような課題を解決するためになされたもので、赤外光用の投光素子及び可視光用の投光素子を備えた光電センサにおいて、光軸ずれの発生を回避可能な光電センサを提供することを目的としている。 The present invention has been made to solve the above-mentioned problems, and it is possible to avoid the occurrence of optical axis deviation in a photoelectric sensor provided with a light projecting element for infrared light and a light projecting element for visible light. The purpose is to provide a light photoelectric sensor.

この発明に係る光電センサは、赤外光を発光する第１発光素子、及び、当該第１発光素子により発光された赤外光を外部に投光する第１投光レンズを有する第１投光部と、第１発光素子と並んで配置されて可視光を発光する第２発光素子、及び、当該第２発光素子により発光された可視光を外部に投光する第２投光レンズを有する第２投光部と、光を集光する受光レンズ、及び、当該受光レンズにより集光された光を受光する受光素子を有する受光部とを備え、第２発光素子は、第１発光素子と受光素子との間に配置され、第２投光部は、第１投光部により投光される赤外光と同一方向に可視光を投光し、第１投光レンズは、軸方向から見て凹んだ形状に構成された凹部を有し、第２投光レンズは、軸方向から見て前記凹部における凹んだ領域内に配置されたことを特徴とする。 The photoelectric sensor according to the present invention has a first light emitting element that emits infrared light and a first light emitting lens that emits infrared light emitted by the first light emitting element to the outside. A second light emitting element having a unit, a second light emitting element arranged side by side with the first light emitting element and emitting visible light, and a second light emitting lens that emits visible light emitted by the second light emitting element to the outside. The second light emitting element includes a light receiving unit having a light emitting unit, a light receiving lens that collects light, and a light receiving element that receives light collected by the light receiving lens, and the second light emitting element is a first light emitting element and light receiving light. Arranged between the elements, the second floodlight unit projects visible light in the same direction as the infrared light projected by the first floodlight unit , and the first floodlight lens is viewed from the axial direction. It has a concave portion formed in a concave shape, and the second light projecting lens is characterized in that it is arranged in the concave region of the concave portion when viewed from the axial direction .

この発明によれば、上記のように構成したので、赤外光用の投光素子及び可視光用の投光素子を備えた光電センサにおいて、光軸ずれの発生を回避可能である。 According to the present invention, since it is configured as described above, it is possible to avoid the occurrence of optical axis deviation in a photoelectric sensor provided with a light projecting element for infrared light and a light projecting element for visible light.

この発明の実施の形態１に係る距離設定形光電センサの構成例を示す図である。It is a figure which shows the structural example of the distance setting type photoelectric sensor which concerns on Embodiment 1 of this invention. この発明の実施の形態１における赤外光用の投光部、可視光用の投光部、受光部及び素子ホルダの構成例を示す側面図である。It is a side view which shows the structural example of the light emitting part for infrared light, the light emitting part for visible light, the light receiving part, and the element holder in Embodiment 1 of this invention. 図３Ａ、図３Ｂは、この発明の実施の形態１における赤外光用の投光レンズ及び可視光用の投光レンズの構成例を示す図であり、図３Ａは側面図であり、図３Ｂは正面図である。3A and 3B are views showing a configuration example of a projection lens for infrared light and a projection lens for visible light according to the first embodiment of the present invention, and FIG. 3A is a side view and FIG. 3B. Is a front view. 図４Ａ、図４Ｂは、この発明の実施の形態１における赤外光用の投光レンズ及び可視光用の投光レンズの別の構成例を示す図であり、図４Ａは側面図であり、図４Ｂは正面図である。4A and 4B are views showing another configuration example of the infrared light projecting lens and the visible light projecting lens according to the first embodiment of the present invention, and FIG. 4A is a side view. FIG. 4B is a front view. この発明の実施の形態１における受光素子上での受光位置と検出体までの距離との関係の一例を示す図である。It is a figure which shows an example of the relationship between the light-receiving position on a light-receiving element and the distance to a detection body in Embodiment 1 of this invention. この発明の実施の形態１における判定部の構成例を示す図である。It is a figure which shows the structural example of the determination part in Embodiment 1 of this invention. この発明の実施の形態１における素子ホルダの構成例を示す正面図である。It is a front view which shows the structural example of the element holder in Embodiment 1 of this invention.

以下、この発明の実施の形態について図面を参照しながら詳細に説明する。
実施の形態１．
図１はこの発明の実施の形態１に係る距離設定形光電センサの構成例を示す図であり、図２はこの発明の実施の形態１における投光部２、投光部３、受光部４及び素子ホルダ７の構成例を示す側面図である。実施の形態１では、光電センサとして距離設定形光電センサを用いた場合を示す。
距離設定形光電センサは、三角測距の原理を利用し、検出領域における検出体１０の有無を判定する。距離設定形光電センサは、図１，２に示すように、基板１、赤外光用の投光部（第１投光部）２、可視光（赤色光）用の投光部（第２投光部）３、受光部４、判定部５、制御部６及び素子ホルダ７を備えている。投光部２は、発光素子（第１発光素子）２１及び投光レンズ（第１投光レンズ）２２を有している。投光部３は、発光素子（第２発光素子）３１及び投光レンズ（第２投光レンズ）３２を有している。受光部４は受光レンズ４１及び受光素子４２を有している。なお図１では、受光素子４２として２分割フォトダイオードを用いた場合を示している。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a distance setting type photoelectric sensor according to the first embodiment of the present invention, and FIG. 2 is a light projecting unit 2, a light emitting unit 3, and a light receiving unit 4 in the first embodiment of the present invention. It is a side view which shows the structural example of the element holder 7. In the first embodiment, a case where a distance setting type photoelectric sensor is used as the photoelectric sensor is shown.
The distance setting type photoelectric sensor uses the principle of triangular distance measurement to determine the presence or absence of the detector 10 in the detection region. As shown in FIGS. 1 and 2, the distance setting type photoelectric sensor includes a substrate 1, a light projecting unit for infrared light (first light projecting unit) 2, and a light projecting unit for visible light (red light) (second light emitting unit). It includes a light projecting unit) 3, a light receiving unit 4, a determination unit 5, a control unit 6, and an element holder 7. The light projecting unit 2 has a light emitting element (first light emitting element) 21 and a light projecting lens (first light emitting lens) 22. The light projecting unit 3 has a light emitting element (second light emitting element) 31 and a light projecting lens (second light emitting lens) 32. The light receiving unit 4 has a light receiving lens 41 and a light receiving element 42. Note that FIG. 1 shows a case where a two-divided photodiode is used as the light receiving element 42.

発光素子２１は、基板１上に配置され、赤外光を発光する。なお、発光素子２１は、所定のデューティーをもったパルス光を発光するのが望ましい。
投光レンズ２２は、発光素子２１により発光された赤外光を外部に投光する。この投光レンズ２２は、検出領域に対向配置され、発光素子２１により発光された赤外光を検出領域に投光する。 The light emitting element 21 is arranged on the substrate 1 and emits infrared light. It is desirable that the light emitting element 21 emits pulsed light having a predetermined duty.
The light projecting lens 22 projects infrared light emitted by the light emitting element 21 to the outside. The projection lens 22 is arranged to face the detection region, and the infrared light emitted by the light emitting element 21 is projected onto the detection region.

発光素子３１は、基板１上に発光素子２１と並んで配置され、可視光を発光する。発光素子３１は、発光素子２１と受光素子４２との間で中央（略中央の意味を含む）に配置されている。なお、発光素子３１は、発光素子２１が発する光のパルス波形に影響を及ぼさないように、直流光を発光するのが望ましい。
投光レンズ３２は、発光素子３１により発光された可視光を外部に投光する。この投光レンズ３２は、検出領域に対向配置され、発光素子３１により発光された可視光を検出領域に投光する。すなわち、投光部３は、投光部２により投光される赤外光と同一（略同一の意味を含む）方向に可視光を投光する。 The light emitting element 31 is arranged side by side with the light emitting element 21 on the substrate 1 and emits visible light. The light emitting element 31 is arranged in the center (including the meaning of substantially the center) between the light emitting element 21 and the light receiving element 42. It is desirable that the light emitting element 31 emits direct current light so as not to affect the pulse waveform of the light emitted by the light emitting element 21.
The light projecting lens 32 projects the visible light emitted by the light emitting element 31 to the outside. The projection lens 32 is arranged to face the detection region, and the visible light emitted by the light emitting element 31 is projected onto the detection region. That is, the light projecting unit 3 projects visible light in the same direction (including substantially the same meaning) as the infrared light projected by the light projecting unit 2.

図３は投光レンズ２２及び投光レンズ３２の構成例を示している。図３では、投光レンズ２２及び投光レンズ３２が一体に構成されている。また、投光レンズ２２は一部に凹部２２１を有し、投光レンズ３２はこの凹部２２１の領域に配置されている。
また、投光レンズ３２は、投光レンズ２２に比べ非常に小さい。また、投光レンズ２２の一部（上側の両端）に凸部を残すことで、投光レンズ３２による投光レンズ２２の性能への影響を抑えることができる。
また、投光レンズ３２の形状は、図３Ｂに示すような矩形型に限らず、例えば図４Ｂに示すような丸型でもよい。また、凹部２２１の形状についても同様に、図３Ｂに示すような矩形型に限らず、例えば図４Ｂに示すような丸みを有する形状でもよい。 FIG. 3 shows a configuration example of the floodlight lens 22 and the floodlight lens 32. In FIG. 3, the floodlight lens 22 and the floodlight lens 32 are integrally configured. Further, the floodlight lens 22 has a recess 221 in a part thereof, and the floodlight lens 32 is arranged in the region of the recess 221.
Further, the floodlight lens 32 is much smaller than the floodlight lens 22. Further, by leaving convex portions on a part of the light projecting lens 22 (both upper ends), it is possible to suppress the influence of the light projecting lens 32 on the performance of the light projecting lens 22.
Further, the shape of the light projecting lens 32 is not limited to the rectangular shape as shown in FIG. 3B, and may be, for example, a round shape as shown in FIG. 4B. Similarly, the shape of the concave portion 221 is not limited to the rectangular shape as shown in FIG. 3B, and may be a rounded shape as shown in FIG. 4B, for example.

受光レンズ４１は、光を集光する。この受光レンズ４１は、検出領域に対向配置され、検出領域からの光を集光する。
受光素子４２は、基板１上に配置され、受光レンズ４１により集光された光を受光する。受光素子４２は、Ｎ側受光面（Ｎｅａｒ側）及びＦ側受光面（Ｆａｒ側）を有する。Ｎ側受光面は、検出体１０が設定距離よりも近い領域（近距離領域）に位置する場合に当該検出体１０による拡散反射光を受光可能である。また、Ｆ側受光面は、検出体１０が設定距離よりも遠い領域（遠距離領域）に位置する場合に当該検出体１０による拡散反射光を受光可能である。 The light receiving lens 41 collects light. The light receiving lens 41 is arranged to face the detection area and collects light from the detection area.
The light receiving element 42 is arranged on the substrate 1 and receives the light collected by the light receiving lens 41. The light receiving element 42 has an N side light receiving surface (Near side) and an F side light receiving surface (Far side). The N-side light receiving surface can receive diffusely reflected light from the detector 10 when the detector 10 is located in a region closer to the set distance (short distance region). Further, the F-side light receiving surface can receive diffuse reflected light by the detector 10 when the detector 10 is located in a region (long distance region) farther than the set distance.

受光素子４２上での受光位置と距離設定形光電センサから検出体１０までの距離との関係を図５に示す。
図５に示すように、検出体１０までの距離が距離ｂ（設定距離）の場合には、当該検出体１０による反射光がＮ側受光面（ＰＤ＿Ｎｅａｒ）とＦ側受光面（ＰＤ＿Ｆａｒ）との境界近傍に受光される。また、検出体１０までの距離が、距離ｂよりも距離設定形光電センサに近い距離ａ（近距離領域上）の場合には、当該検出体１０による反射光がＮ側受光面に受光される。また、検出体１０までの距離が、距離ｂよりも距離設定形光電センサから遠い距離ｃ（遠距離領域上）の場合には、当該検出体１０による反射光がＦ側受光面に受光される。 FIG. 5 shows the relationship between the light receiving position on the light receiving element 42 and the distance from the distance setting type photoelectric sensor to the detector 10.
As shown in FIG. 5, when the distance to the detector 10 is the distance b (set distance), the light reflected by the detector 10 is a light receiving surface on the N side (PD_Near) and a light receiving surface on the F side (PD_Far). Light is received near the boundary. When the distance to the detector 10 is closer to the distance setting type photoelectric sensor than the distance b (on the short distance region), the reflected light from the detector 10 is received by the N-side light receiving surface. .. Further, when the distance to the detector 10 is a distance c (on a long distance region) farther from the distance setting type photoelectric sensor than the distance b, the reflected light by the detector 10 is received by the light receiving surface on the F side. ..

判定部５は、受光部４による受光結果に基づいて、検出領域における検出体１０の有無を判定する。この判定部５は、図６に示すように、位置判定部５１を有している。 The determination unit 5 determines the presence / absence of the detector 10 in the detection region based on the light reception result by the light receiving unit 4. As shown in FIG. 6, the determination unit 5 has a position determination unit 51.

位置判定部５１は、受光部４（受光素子４２）により受光された光の受光位置を判定する。この際、位置判定部５１は、Ｎ側受光面に受光された光を示す信号Ｉ＿ＮｅａｒとＦ側受光面に受光された光を示す信号Ｉ＿Ｆａｒとを比較し、信号Ｉ＿Ｎｅａｒの方が大きな値をとるときに受光位置がＮ側受光面であると判定する。 The position determination unit 51 determines the light receiving position of the light received by the light receiving unit 4 (light receiving element 42). At this time, the position determination unit 51 compares the signal I_Near indicating the light received on the light receiving surface on the N side with the signal I_Far indicating the light received on the light receiving surface on the F side, and the signal I_Near takes a larger value. Sometimes it is determined that the light receiving position is the N side light receiving surface.

判定部５は、位置判定部５１による判定結果から検出体１０の有無を判定する。ここで、判定部５は、位置判定部５１により受光位置がＮ側受光面であると判定された場合には、検出体１０が有ると判定する。また、判定部５は、位置判定部５１により受光位置がＮ側受光面であると判定されない場合には、検出体１０が無いと判定する。 The determination unit 5 determines the presence / absence of the detection body 10 from the determination result by the position determination unit 51. Here, when the position determination unit 51 determines that the light receiving position is the N-side light receiving surface, the determination unit 5 determines that the detector 10 is present. Further, when the position determination unit 51 does not determine that the light receiving position is the N-side light receiving surface, the determination unit 5 determines that the detector 10 is absent.

制御部６は、発光素子２１及び発光素子３１の発光を制御する。この制御部６は、距離設定形光電センサの動作モードが調整モードである場合に、発光素子２１及び発光素子３１を発光させる。調整モードは、距離設定形光電センサを感度調整する際に距離設定形光電センサに対してユーザにより設定される動作モードである。また、制御部６は、距離設定形光電センサの動作モードが通常モードである場合に、発光素子２１を発光させる。通常モードは、距離設定形光電センサを運用する際に距離設定形光電センサに対してユーザにより設定される動作モードである。 The control unit 6 controls the light emission of the light emitting element 21 and the light emitting element 31. The control unit 6 causes the light emitting element 21 and the light emitting element 31 to emit light when the operation mode of the distance setting type photoelectric sensor is the adjustment mode. The adjustment mode is an operation mode set by the user for the distance setting type photoelectric sensor when adjusting the sensitivity of the distance setting type photoelectric sensor. Further, the control unit 6 causes the light emitting element 21 to emit light when the operation mode of the distance setting type photoelectric sensor is the normal mode. The normal mode is an operation mode set by the user for the distance setting type photoelectric sensor when operating the distance setting type photoelectric sensor.

なお、判定部５及び制御部６は、システムＬＳＩ（Ｌａｒｇｅ Ｓｃａｌｅ Ｉｎｔｅｇｒａｔｉｏｎ）等の処理回路、又はメモリ等に記憶されたプログラムを実行するＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）等により実現される。 The determination unit 5 and the control unit 6 are realized by a processing circuit such as a system LSI (Large Scale Integration), a CPU (Central Processing Unit) that executes a program stored in a memory or the like, or the like.

素子ホルダ７は、図２，７に示すように、投光部２（発光素子２１及び投光レンズ２２）を収容する投光収容部７１、投光部３（発光素子３１及び投光レンズ３２）を収容する投光収容部７２、及び、受光部４（受光レンズ４１及び受光素子４２）を収容する受光収容部７３を有する。図７では、距離設定形光電センサのうちの素子ホルダ７の構成のみを図示している。 As shown in FIGS. ), And a light receiving unit 73 that accommodates the light receiving unit 4 (light receiving lens 41 and light receiving element 42). FIG. 7 illustrates only the configuration of the element holder 7 in the distance setting type photoelectric sensor.

投光収容部７１は、一面が開口された筐体構造に構成されている。図２，７に示すように、投光収容部７１の内部奥には、発光素子２１が配置される位置に設けられる開口部７１１が設けられている。また、投光収容部７１の開口部７１１と反対側の開口端には、投光レンズ２２が取付けられるレンズ取付け部７１２が設けられている。また、投光収容部７１の内面（上面、底面及び左右面）には、段差部７１３が設けられている。段差部７１３は、開口部７１１側からレンズ取付け部７１２側に沿って広がった階段状に構成されている。 The floodlight accommodating portion 71 is configured in a housing structure with one side open. As shown in FIGS. 2 and 7, an opening 711 provided at a position where the light emitting element 21 is arranged is provided in the inner part of the light projecting accommodating portion 71. Further, a lens mounting portion 712 to which the floodlight lens 22 is mounted is provided at the opening end of the floodlight accommodating portion 71 on the opposite side of the opening portion 711. Further, a step portion 713 is provided on the inner surface (upper surface, bottom surface, left and right surface) of the floodlight accommodating portion 71. The step portion 713 is configured in a stepped shape extending from the opening 711 side along the lens mounting portion 712 side.

投光収容部７２は、一面が開口された筐体構造に構成されている。図２，７に示すように、投光収容部７２の内部奥には、発光素子３１が配置される位置に設けられる開口部７２１が設けられている。また、投光収容部７２の開口部７２１と反対側の開口端には、投光レンズ３２が取付けられるレンズ取付け部７２２が設けられている。 The floodlight accommodating portion 72 is configured in a housing structure with one side open. As shown in FIGS. 2 and 7, an opening 721 provided at a position where the light emitting element 31 is arranged is provided in the inner part of the light projecting accommodating portion 72. Further, a lens mounting portion 722 to which the floodlight lens 32 is mounted is provided at the opening end of the floodlight accommodating portion 72 on the opposite side of the opening portion 721.

受光収容部７３は、一面が開口された筐体構造に構成されている。図２，７に示すように、受光収容部７３の内部奥には、受光素子４２が配置される位置に設けられる開口部７３１が設けられている。また、受光収容部７３の開口部７３１と反対側の開口端には、受光レンズ４１が取付けられるレンズ取付け部７３２が設けられている。また、受光収容部７３の内面（上面、底面及び左右面）には、段差部７３３が設けられている。段差部７３３は、開口部７３１側からレンズ取付け部７３２側に沿って広がった階段状に構成されている。 The light receiving accommodating portion 73 is configured in a housing structure having one side open. As shown in FIGS. 2 and 7, an opening 731 provided at a position where the light receiving element 42 is arranged is provided in the inner part of the light receiving accommodating portion 73. Further, a lens mounting portion 732 to which the light receiving lens 41 is mounted is provided at the opening end of the light receiving accommodating portion 73 on the opposite side of the opening 731. Further, a step portion 733 is provided on the inner surface (upper surface, bottom surface, left and right surface) of the light receiving accommodating portion 73. The step portion 733 is configured in a staircase shape extending from the opening 731 side along the lens mounting portion 732 side.

素子ホルダ７は、発光素子２１と発光素子３１（投光側）の間にしきりの壁を持つことを特徴とする。投光側にしきりの壁を設けているのは、発光素子２１からの光が投光レンズ３２を通して外部に投光されて検出性能に影響を与えることがないようにするためと、発光素子３１からの光が投光レンズ２２を通して外部に投光されて投光スポットの見た目に影響を与えることがないようにするためである。
なお、発光素子３１と受光素子４２（受光側）の間にしきりの壁を設けていないのは、受光素子４２は光のパルス波形を検出して動作するため、発光素子３１による光が直流光である場合は、発光素子３１による光が受光素子４２に入射しても検出性能への影響がないためである。一方、発光素子３１と受光素子４２との間にしきりの壁を設けてもよい。 The element holder 7 is characterized by having a wall between the light emitting element 21 and the light emitting element 31 (light emitting side). The reason why the wall is provided on the light emitting side is to prevent the light from the light emitting element 21 from being projected to the outside through the light emitting lens 32 and affecting the detection performance, and the light emitting element 31. This is to prevent the light from the light beam from being projected to the outside through the floodlight lens 22 and affecting the appearance of the floodlight spot.
The reason why no wall is provided between the light emitting element 31 and the light receiving element 42 (light receiving side) is that the light receiving element 42 operates by detecting the pulse waveform of the light, so that the light from the light emitting element 31 is DC light. This is because even if the light emitted from the light emitting element 31 enters the light receiving element 42, the detection performance is not affected. On the other hand, a wall may be provided between the light emitting element 31 and the light receiving element 42.

次に、実施の形態１に係る距離設定形光電センサの効果について説明する。
実施の形態１に係る距離設定形光電センサでは、距離設定形光電センサを感度調整する際に、投光部２により投光された赤外光がどの領域に当たっているかを示すため、この赤外光と同一方向に可視光を投光する投光部３を追加している。なお、投光部２と投光部３は単一の素子ホルダ７内に設けられている。更に、実施の形態１では、投光部３が、投光部２が有する投光レンズ２２とは別体である専用の投光レンズ３２を有している。これにより、実施の形態１に係る距離設定形光電センサでは、投光部３の光軸を投光部２の光軸と一致（略一致の意味を含む）させることが可能となり、光軸ずれを回避できる。 Next, the effect of the distance setting type photoelectric sensor according to the first embodiment will be described.
In the distance setting type photoelectric sensor according to the first embodiment, when the sensitivity of the distance setting type photoelectric sensor is adjusted, the infrared light projected by the light projecting unit 2 indicates which region the infrared light is exposed to. A light projecting unit 3 that projects visible light in the same direction as the above is added. The light projecting unit 2 and the light projecting unit 3 are provided in a single element holder 7. Further, in the first embodiment, the light projecting unit 3 has a dedicated light projecting lens 32 which is different from the light projecting lens 22 of the light projecting unit 2. As a result, in the distance setting type photoelectric sensor according to the first embodiment, the optical axis of the light projecting unit 3 can be aligned with the optical axis of the light projecting unit 2 (including the meaning of substantially matching), and the optical axis shifts. Can be avoided.

また図２では、発光素子２１及び発光素子３１が単一の基板１上に配置されている。これにより、発光素子２１と発光素子３１の位置関係のずれを容易に回避できる。また図２～４では、投光レンズ２２及び投光レンズ３２が一体に構成されている。これにより、投光レンズ２２及び投光レンズ３２の位置関係のずれを容易に回避できる。
なお図２では、発光素子２１及び発光素子３１が単一の基板１上に配置されているが、これに限らず、発光素子２１及び発光素子３１が異なる基板上に配置されていてもよい。また図２～４では、投光レンズ２２及び投光レンズ３２が一体に構成されているが、これに限らず、投光レンズ２２及び投光レンズ３２が別体であってもよい。 Further, in FIG. 2, the light emitting element 21 and the light emitting element 31 are arranged on a single substrate 1. Thereby, the deviation of the positional relationship between the light emitting element 21 and the light emitting element 31 can be easily avoided. Further, in FIGS. 2 to 4, the floodlight lens 22 and the floodlight lens 32 are integrally configured. As a result, it is possible to easily avoid the displacement of the positional relationship between the floodlight lens 22 and the floodlight lens 32.
In FIG. 2, the light emitting element 21 and the light emitting element 31 are arranged on a single substrate 1, but the present invention is not limited to this, and the light emitting element 21 and the light emitting element 31 may be arranged on different substrates. Further, in FIGS. 2 to 4, the floodlight lens 22 and the floodlight lens 32 are integrally configured, but the present invention is not limited to this, and the floodlight lens 22 and the floodlight lens 32 may be separate bodies.

また、投光部２と受光部４との間に可視光用の投光部３を配置する場合に、投光部２と受光部４との間の隙間が広がると、近距離デッド領域が広がってしまう。近距離デッド領域とは、検出体１０が距離設定形光電センサに近すぎるために検出体１０が無いと判定してしまう距離領域である。そこで、図３，４に示すように、投光レンズ２２の一部に凹部２２１を形成し、この凹部２２１の領域に投光レンズ３２を配置することで、上記隙間が広がることを抑制できる。 Further, when the light emitting unit 3 for visible light is arranged between the light emitting unit 2 and the light receiving unit 4, if the gap between the light emitting unit 2 and the light receiving unit 4 is widened, a short-distance dead region is created. It will spread. The short-distance dead region is a distance region in which it is determined that the detector 10 is absent because the detector 10 is too close to the distance setting type photoelectric sensor. Therefore, as shown in FIGS. 3 and 4, by forming the recess 221 in a part of the floodlight lens 22 and arranging the floodlight lens 32 in the region of the recess 221, it is possible to suppress the expansion of the gap.

また、制御部６は、調整モードの場合に投光部３による可視光の投光を実施させ、運転モードの場合には投光部３による可視光の投光は停止させることで、省エネを実現できる。 Further, the control unit 6 saves energy by causing the light projecting unit 3 to project visible light in the adjustment mode and stopping the visible light projecting by the light projecting unit 3 in the operation mode. realizable.

なお上記では、受光素子４２として２分割フォトダイオードを用いた場合を示した。しかしながら、これに限らず、受光素子４２として、ＰＳＤ（Ｐｏｓｉｔｉｏｎ Ｓｅｎｓｉｔｉｖｅ Ｄｅｖｉｃｅ）又は多分割フォトダイオード等の位置検出素子を用いてもよい。 In the above, the case where the two-divided photodiode is used as the light receiving element 42 is shown. However, the present invention is not limited to this, and a position detection element such as a PSD (Position Sensitive Device) or a multi-segment photodiode may be used as the light receiving element 42.

また、投光部２による光がパルス光であり且つ投光部３による光が直流光である場合、制御部６は、例えば最初に光電センサを工場のライン等にセッティングをして投受光のチューニングを行う場合等に、投光部２と投光部３を併用して使用することも可能である。よってこの場合、ユーザは、対象物に正確に投光されているかを直流光で目視しながら、赤外光の投光部２と受光部４による投受光のチューニングを行うことが可能となる。 When the light from the light projecting unit 2 is pulsed light and the light from the light projecting unit 3 is DC light, the control unit 6 first sets the photoelectric sensor on a factory line or the like to receive light. It is also possible to use the light projecting unit 2 and the light projecting unit 3 in combination when tuning or the like. Therefore, in this case, the user can tune the light emission / reception by the infrared light projection unit 2 and the light receiving unit 4 while visually observing whether the light is accurately projected onto the object with direct current light.

また上記では、光電センサとして、距離設定形光電センサを用いた場合を示した。しかしながら、これに限らず、検出体１０による反射光を受光する光電センサであればよい。光電センサとして、反射形光電センサを用いてもよく、上記と同様の効果を得ることができる。 Further, in the above, the case where the distance setting type photoelectric sensor is used as the photoelectric sensor is shown. However, the present invention is not limited to this, and any photoelectric sensor that receives the reflected light from the detector 10 may be used. A reflective photoelectric sensor may be used as the photoelectric sensor, and the same effect as described above can be obtained.

以上のように、この実施の形態１によれば、赤外光を発光する発光素子２１、及び、当該発光素子２１により発光された赤外光を外部に投光する投光レンズ２２を有する投光部２と、発光素子２１と並んで配置されて可視光を発光する発光素子３１、及び、当該発光素子３１により発光された可視光を外部に投光する投光レンズ３２を有する投光部３とを備え、投光部３は、投光部２により投光される赤外光と同一方向に可視光を投光するように構成したので、投光部３の光軸を投光部２の光軸に一致させることができ、光軸ずれの発生を回避可能である。 As described above, according to the first embodiment, the projectile has a light emitting element 21 that emits infrared light and a light projecting lens 22 that emits infrared light emitted by the light emitting element 21 to the outside. A light projecting unit having a light emitting unit 2, a light emitting element 31 arranged side by side with the light emitting element 21 to emit visible light, and a light projecting lens 32 that emits visible light emitted by the light emitting element 31 to the outside. Since the light projecting unit 3 is configured to project visible light in the same direction as the infrared light projected by the light projecting unit 2, the optical axis of the light projecting unit 3 is set as the light projecting unit. It can be matched with the optical axis of 2, and the occurrence of optical axis deviation can be avoided.

なお、本願発明はその発明の範囲内において、実施の形態の任意の構成要素の変形、もしくは実施の形態の任意の構成要素の省略が可能である。 In the present invention, within the scope of the invention, it is possible to modify any component of the embodiment or omit any component of the embodiment.

１ 基板
２ 投光部（第１投光部）
３ 投光部（第２投光部）
４ 受光部
５ 判定部
６ 制御部
７ 素子ホルダ
１０ 検出体
２１ 発光素子（第１発光素子）
２２ 投光レンズ（第１投光レンズ）
３１ 発光素子（第２発光素子）
３２ 投光レンズ（第２投光レンズ）
４１ 受光レンズ
４２ 受光素子
５１ 位置判定部
７１ 投光収容部
７２ 投光収容部
７３ 受光収容部
２２１ 凹部
７１１ 開口部
７１２ レンズ取付け部
７１３ 段差部
７２１ 開口部
７２２ レンズ取付け部
７３１ 開口部
７３２ レンズ取付け部
７３３ 段差部 1 Substrate 2 Floodlight (1st floodlight)
3 Floodlight section (2nd floodlight section)
4 Light receiving unit 5 Judgment unit 6 Control unit 7 Element holder 10 Detector 21 Light emitting element (first light emitting element)
22 Floodlight lens (1st floodlight lens)
31 Light emitting element (second light emitting element)
32 Floodlight lens (second floodlight lens)
41 Light-receiving lens 42 Light-receiving element 51 Position determination unit 71 Light-emitting housing 72 Light-emitting housing 73 Light-receiving unit 221 Recession 711 Opening 712 Lens mounting 713 Step 721 Opening 722 Lens mounting 731 Opening 732 Lens mounting 733 Steps

Claims (3)

赤外光を発光する第１発光素子、及び、当該第１発光素子により発光された赤外光を外部に投光する第１投光レンズを有する第１投光部と、
前記第１発光素子と並んで配置されて可視光を発光する第２発光素子、及び、当該第２発光素子により発光された可視光を外部に投光する第２投光レンズを有する第２投光部と、
光を集光する受光レンズ、及び、当該受光レンズにより集光された光を受光する受光素子を有する受光部とを備え、
前記第２発光素子は、前記第１発光素子と前記受光素子との間に配置され、
前記第２投光部は、前記第１投光部により投光される赤外光と同一方向に可視光を投光し、
前記第１投光レンズは、軸方向から見て凹んだ形状に構成された凹部を有し、
前記第２投光レンズは、軸方向から見て前記凹部における凹んだ領域内に配置された
ことを特徴とする光電センサ。 A first light emitting element that emits infrared light, and a first light emitting unit having a first light emitting lens that emits infrared light emitted by the first light emitting element to the outside.
A second throwing element having a second light emitting element arranged side by side with the first light emitting element and emitting visible light, and a second light emitting lens that emits visible light emitted by the second light emitting element to the outside. Hikaribe and
A light receiving lens that collects light and a light receiving unit having a light receiving element that receives light collected by the light receiving lens are provided.
The second light emitting element is arranged between the first light emitting element and the light receiving element.
The second light projecting unit projects visible light in the same direction as the infrared light projected by the first light projecting unit .
The first floodlight lens has a recess formed in a concave shape when viewed from the axial direction.
The second light projecting lens was arranged in a recessed region in the recess when viewed from the axial direction.
A photoelectric sensor characterized by this. 前記第１発光素子及び前記第２発光素子が配置された単一の基板を備えた
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, further comprising a single substrate on which the first light emitting element and the second light emitting element are arranged. 前記第１投光レンズ及び前記第２投光レンズは一体に構成された
ことを特徴とする請求項１又は請求項２記載の光電センサ。 The photoelectric sensor according to claim 1 or 2, wherein the first floodlight lens and the second floodlight lens are integrally configured .
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