JPH11232972A - Detection head of reflecting type photoelectric switch - Google Patents
Detection head of reflecting type photoelectric switchInfo
- Publication number
- JPH11232972A JPH11232972A JP5286698A JP5286698A JPH11232972A JP H11232972 A JPH11232972 A JP H11232972A JP 5286698 A JP5286698 A JP 5286698A JP 5286698 A JP5286698 A JP 5286698A JP H11232972 A JPH11232972 A JP H11232972A
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- JP
- Japan
- Prior art keywords
- light
- detection head
- receiving
- detection
- projecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Electronic Switches (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は反射型光電スイッチ
の検出ヘッドに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection head for a reflection type photoelectric switch.
【０００２】[0002]
【従来の技術およびその課題】従来より、図４の液晶の
ガラス基板などの薄い板状のワーク（検出対象物）Ｗｎ
を搬送するロボットアーム１００に、反射型光電スイッ
チの検出ヘッド２００を埋め込んだ搬送システムがあ
る。かかるシステムでは、上下２枚のワークＷ０，Ｗ１
の狭い隙間にロボットアーム１００を挿入する上、各ワ
ークＷｎが撓んでいるので、図５の検出ヘッド２００の
厚さｔを４mm〜６mm程度に設定している。しかし、かか
るシステムでは更なる検出ヘッドの薄型化の要請が強い
のに対し、現在のところ４mmよりも薄い検出ヘッド２０
０は実現されていない。2. Description of the Related Art Conventionally, a thin plate-shaped work (detection target) Wn such as a liquid crystal glass substrate shown in FIG.
There is a transfer system in which a detection head 200 of a reflection type photoelectric switch is embedded in a robot arm 100 that transfers the light. In such a system, two upper and lower works W0, W1
The thickness t of the detection head 200 in FIG. 5 is set to about 4 mm to 6 mm because the robot arm 100 is inserted into the narrow gap and the respective workpieces Wn are bent. However, in such a system, while there is a strong demand for a thinner detection head, at present, the detection head 20 thinner than 4 mm is used.
0 has not been realized.
【０００３】また、透明のワークＷｎの場合には、検出
対象のワークＷ１を通過した光が非検出対象のワークＷ
２で反射されて誤検出されるのを防止するために、検出
ヘッド２００をいわゆる限定反射方式にしている。すな
わち、投光軸Ｓ１と受光軸Ｓ２とが互いに交差するよう
に光学系を配置して、検出ヘッド２００から所定の距離
Ｄに位置するワークＷ１のみを検出するようにしてい
る。しかし、かかる限定反射方式では、検出可能な距離
Ｄの範囲つまり検出領域が極めて狭く、したがって、検
出領域を大きくしたいという要請がある。[0003] In the case of a transparent work Wn, the light that has passed through the work W1 to be detected is the work W1 that is not to be detected.
In order to prevent erroneous detection due to reflection at 2, the detection head 200 is of a so-called limited reflection type. That is, the optical system is arranged so that the light projecting axis S1 and the light receiving axis S2 intersect each other, and only the work W1 located at a predetermined distance D from the detection head 200 is detected. However, in such a limited reflection system, the range of the detectable distance D, that is, the detection area is extremely narrow, and therefore, there is a demand to increase the detection area.
【０００４】本発明は、前記従来の問題に鑑みてなされ
たもので、その目的は、いわゆる限定反射方式の反射型
光電スイッチの検出ヘッドにおいて、該検出ヘッドの薄
型化と検出領域の拡大を図ることである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the thickness of a detection head of a so-called limited reflection type reflection type photoelectric switch and to expand a detection area. That is.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、光学系の投光軸と受光軸とが互いに交差
するように設定して、投光手段から出射された略平行な
光束を検出対象物で反射させ、該反射光を受光手段によ
り受光すると共に、検出対象物における投光手段からの
光が照射される照射領域と受光手段によって受光する受
光領域の一方を帯状に設定し、かつ、他方を前記帯状の
領域における長手方向の一部分に設定した反射型光電ス
イッチの検出ヘッドであって、該検出ヘッドの投受光窓
に投光手段および検出対象物からの光を反射する棒状の
反射プリズムを設けることで、該検出ヘッド内における
光路を含む平面に対し、該検出ヘッド外における光路を
含む平面を略直交するように設定した。In order to achieve the above object, the present invention provides an optical system in which a light projecting axis and a light receiving axis are set so as to intersect with each other so that substantially parallel light emitted from a light projecting means is provided. A light beam reflected by the object to be detected, the reflected light is received by the light receiving means, and one of the irradiation area of the object to be irradiated with the light from the light projecting means and the light receiving area received by the light receiving means is formed in a band shape. A detection head of a reflection type photoelectric switch, wherein the light from the light projecting means and the object to be detected is reflected on a light transmitting / receiving window of the detection head. By providing a rod-shaped reflecting prism, the plane including the optical path inside the detection head was set so as to be substantially orthogonal to the plane including the optical path outside the detection head.
【０００６】本発明によれば、棒状の反射プリズムを設
けたので、該反射プリズム、投光手段および受光手段を
平板状の薄い検出ヘッド内の一平面上に配置した状態
で、前記反射プリズムによって前記平板状の検出ヘッド
に対し略直交する方向に光を投光することができる。According to the present invention, since the rod-shaped reflecting prism is provided, the reflecting prism, the light projecting means and the light receiving means are arranged on one plane in a flat thin detecting head, and the reflecting prism is used by the reflecting prism. Light can be projected in a direction substantially orthogonal to the flat detection head.
【０００７】[0007]
【発明の実施の形態】以下、本発明の一実施形態を図面
にしたがって説明する。図１において、反射型光電スイ
ッチは、検出ヘッド１、投光用光ファイバ２０、受光用
光ファイバ３０およびアンプ部４を備えている。該アン
プ部４には、図示しない投光回路や閾値設定回路などの
種々の信号処理回路が収容されており、該アンプ部４と
検出ヘッド１とは、互いに分離されていると共に、前記
両ファイバ２０，３０を介して接続されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the reflection type photoelectric switch includes a detection head 1, a light emitting optical fiber 20, a light receiving optical fiber 30, and an amplifier unit 4. The amplifier unit 4 accommodates various signal processing circuits such as a light emitting circuit and a threshold setting circuit (not shown). The amplifier unit 4 and the detection head 1 are separated from each other and They are connected via 20, 30.
【０００８】前記検出ヘッド１は、上下に２分割された
第１および第２分割ケース１１，１２でヘッドケース１
０が形成されており、該ヘッドケース１０の分割面１３
には、前記両光ファイバ２０，３０を図２のように挿通
する挿通孔１４，１５が形成されている。前記両光ファ
イバ２０，３０の先端は、直方体状の固定具１７を介し
て一方の分割ケース１１，１２に固定されていると共
に、該固定具１７内において、光ファイバ２０，３０の
軸線Ｆｓが曲げられている。なお、前記図１の第２分割
ケース１２には、帯状に長い投受光窓１６が形成されて
いる。The detection head 1 comprises a head case 1 having first and second divided cases 11 and 12 which are divided into upper and lower parts.
0 is formed, and the dividing surface 13 of the head case 10
In FIG. 2, insertion holes 14 and 15 for inserting the optical fibers 20 and 30 as shown in FIG. 2 are formed. The distal ends of the two optical fibers 20 and 30 are fixed to one of the split cases 11 and 12 via a rectangular parallelepiped fixing tool 17, and the axis Fs of the optical fibers 20 and 30 is fixed in the fixing tool 17. Bent. The second divided case 12 of FIG. 1 is formed with a long light transmitting / receiving window 16 in a band shape.
【０００９】前記ヘッドケース１０内には、図３に示す
ように、前記両光ファイバ２０，３０の先端部、投光レ
ンズ２１、受光レンズ３１および断面三角形の反射プリ
ズム５が収容されている。前記投光用光ファイバ２０お
よび投光レンズ２１は投光手段２を構成しており、一
方、前記受光用光ファイバ３０および受光レンズ３１は
受光手段３を構成している。なお、反射プリズム５は図
１の投受光窓１６を閉塞するように投受光窓１６に設け
られている。As shown in FIG. 3, the head case 10 houses the distal ends of the two optical fibers 20, 30, the light projecting lens 21, the light receiving lens 31, and the reflecting prism 5 having a triangular cross section. The light projecting optical fiber 20 and the light projecting lens 21 constitute light projecting means 2, while the light receiving optical fiber 30 and the light receiving lens 31 constitute light receiving means 3. The reflecting prism 5 is provided in the light emitting / receiving window 16 so as to close the light emitting / receiving window 16 in FIG.
【００１０】図３の前記投光レンズ２１は、たとえば略
扇形の平板状で、投光用光ファイバ２０からの光Ｌを断
面帯状の略平行な平行光Ｌ１にして、反射プリズム５の
反射面５０に向って出射する。該反射面５０は、前記略
平行な光束Ｌ１を上方のワーク（検出対象物）Ｗに向っ
て反射する。したがって、ワークＷには、破線で示すよ
うに、帯状の照射領域Ａ１にわたって平行光Ｌ１が照射
される。一方、図２に示すように、光学系の投光軸Ｓ１
と受光軸Ｓ２とは、点Ｏにおいて互いに交差するように
設定され、かつ、図３のワークＷにおける受光手段３に
よって受光する受光領域Ａ２が前記照射領域Ａ１の長手
方向Ｘの一部分に設定されており、したがって、ワーク
Ｗから検出ヘッド１までの距離が所定範囲の場合には、
ワークＷで反射された反射光Ｌ２は、反射プリズム５の
前記反射面５０に入射して反射され、その一部が受光レ
ンズ３１によって集光されて受光用光ファイバ３０の先
端の受光面３０ａによって受光される。The light projecting lens 21 shown in FIG. 3 is, for example, a substantially fan-shaped flat plate, and converts the light L from the light projecting optical fiber 20 into a substantially parallel parallel light L1 having a band-like cross section. The light is emitted toward 50. The reflecting surface 50 reflects the substantially parallel light flux L1 toward an upper workpiece (detection target) W. Therefore, as shown by the broken line, the work W is irradiated with the parallel light L1 over the belt-shaped irradiation area A1. On the other hand, as shown in FIG.
And the light receiving axis S2 are set so as to intersect each other at the point O, and the light receiving area A2 of the work W shown in FIG. 3 which is received by the light receiving means 3 is set in a part of the irradiation area A1 in the longitudinal direction X. Therefore, when the distance from the work W to the detection head 1 is within a predetermined range,
The reflected light L2 reflected by the work W is incident on and reflected by the reflecting surface 50 of the reflecting prism 5, a part of which is condensed by the light receiving lens 31, and is reflected by the light receiving surface 30a at the tip of the light receiving optical fiber 30. Received.
【００１１】すなわち、検出ヘッド１からワークＷまで
の距離が小さい場合には、照射領域Ａ１における長手方
向Ｘの右側の一部（斜線部）Ａ２で反射された反射光Ｌ
２が受光され、一方、検出ヘッド１からワークＷまでの
距離が大きい場合には、照射領域Ａ１における長手方向
Ｘの左側の一部（斜線部）Ａ２で反射された反射光Ｌ２
が受光される。その結果、限定反射方式であっても検出
領域の拡大を図ることができる。That is, when the distance from the detection head 1 to the work W is small, the reflected light L reflected by a part (shaded portion) A2 on the right side in the longitudinal direction X in the irradiation area A1.
2 is received, while, when the distance from the detection head 1 to the workpiece W is large, the reflected light L2 reflected by a part (hatched portion) A2 on the left side in the longitudinal direction X in the irradiation area A1
Is received. As a result, the detection area can be expanded even in the limited reflection type.
【００１２】前記両光ファイバ２０，３０の軸線Ｆｓお
よび投受光レンズ２１，３１の光軸Ｓ１，Ｓ２は、図１
の検出ヘッド１のヘッドケース１０内の一平面Ｆ１内に
設定されている。一方、図３の反射面５０で反射されて
出射される光Ｌ１の光路およびワークＷから反射面５０
に向って入射する反射光Ｌ２の光路を含む図１の平面Ｆ
２は、前記光学要素２０，２１，３０，３１を配置した
平面Ｆ１と略直交するように配置されている。The axis Fs of the optical fibers 20 and 30 and the optical axes S1 and S2 of the light projecting and receiving lenses 21 and 31 are shown in FIG.
Are set in one plane F1 in the head case 10 of the detection head 1 of FIG. On the other hand, the optical path of the light L1 reflected and emitted by the reflecting surface 50 in FIG.
1 including the optical path of the reflected light L2 incident toward
2 is arranged so as to be substantially perpendicular to the plane F1 on which the optical elements 20, 21, 30, 31 are arranged.
【００１３】このように、図３の両光ファイバ２０，３
０の軸線Ｆｓおよび投受光レンズ２１，３１の光軸Ｓ
１，Ｓ２を一平面上に設定したので、各光学要素２０，
２１，３０，３１を、図１の検出ヘッド１の厚さｔ方向
に重ね合わせる必要がなく、また、光ファイバ２０，３
０を用いたから、検出ヘッド１の厚さｔが薄くなる。As described above, the two optical fibers 20 and 3 shown in FIG.
0 axis Fs and the optical axis S of the projection / reception lenses 21 and 31
1, S2 are set on one plane, so that each optical element 20,
There is no need to superimpose 21, 30, 31 in the thickness t direction of the detection head 1 in FIG.
Since 0 is used, the thickness t of the detection head 1 is reduced.
【００１４】ところで、前記実施形態では、図３の照射
領域Ａ１を帯状に設定したが、本発明では受光領域Ａ２
を帯状に設定し、かつ、照射領域Ａ１を受光領域Ａ２の
長手方向の一部に設定してもよい。In the above embodiment, the irradiation area A1 shown in FIG. 3 is set in a band shape.
May be set in a band shape, and the irradiation area A1 may be set in a part of the light receiving area A2 in the longitudinal direction.
【００１５】[0015]
【発明の効果】以上説明したように、本発明によれば、
限定反射方式の光電スイッチにおいて、投受光領域の一
方を帯状に設定したので、検出可能な距離の範囲が広が
る。特に、検出ヘッドの投受光窓に棒状の反射プリズム
を設けたので、平板状の検出ヘッド内に光学要素を配置
し、該光学要素を配置した平面に略直交する平面上にお
いて光を入出射させることができるから、検出ヘッドの
薄型化を図ることができる。As described above, according to the present invention,
In the limited reflection type photoelectric switch, one of the light emitting and receiving areas is set in a band shape, so that the range of the detectable distance is widened. In particular, since a rod-shaped reflection prism is provided in the light emitting / receiving window of the detection head, the optical element is arranged in the flat detection head, and light enters and exits on a plane substantially orthogonal to the plane on which the optical element is arranged. Accordingly, the thickness of the detection head can be reduced.
【図１】本発明の一実施形態にかかるアンプ分離式の光
電スイッチの拡大斜視図である。FIG. 1 is an enlarged perspective view of an amplifier-separated photoelectric switch according to an embodiment of the present invention.
【図２】検出ヘッドの平面断面図である。FIG. 2 is a plan sectional view of a detection head.
【図３】光学系を示す斜視図である。FIG. 3 is a perspective view showing an optical system.
【図４】本検出ヘッドの用い方を示す斜視図である。FIG. 4 is a perspective view showing how to use the present detection head.
【図５】従来の検出ヘッドの概念図である。FIG. 5 is a conceptual diagram of a conventional detection head.
１：検出ヘッド １６：投受光窓 ２：投光手段 ２０：投光用光ファイバ ２１：投光レンズ ３：受光手段 ３０：受光用光ファイバ ３１：受光レンズ Ｌ：光 Ｌ１：平行光 Ｌ２：反射光 Ｓ１：投光軸 Ｓ２：受光軸 Ｆｓ：軸線 Ｆ１：平面 Ｆ２：平面 Ｗ：検出対象物（ワーク） 1: detection head 16: light emitting / receiving window 2: light emitting means 20: light emitting optical fiber 21: light emitting lens 3: light receiving means 30: light receiving optical fiber 31: light receiving lens L: light L1: parallel light L2: reflection Light S1: Projection axis S2: Light receiving axis Fs: Axis F1: Plane F2: Plane W: Detection target (work)
Claims (2)
するように設定して、投光手段から出射された略平行な
光束を検出対象物で反射させ、該反射させた反射光を受
光手段により受光すると共に、 前記検出対象物における前記投光手段からの光が照射さ
れる照射領域と、前記検出対象物における前記受光手段
によって受光する受光領域の一方を帯状に設定し、か
つ、他方を前記帯状の領域における長手方向の一部分に
設定した反射型光電スイッチの検出ヘッドであって、 該検出ヘッドの投受光窓に前記投光手段および検出対象
物からの光を反射する棒状の反射プリズムを設けること
で、該検出ヘッド内における光路を含む平面に対し、該
検出ヘッド外における光路を含む平面を略直交するよう
に設定した反射型光電スイッチの検出ヘッド。1. A light-projecting axis and a light-receiving axis of an optical system are set so as to intersect with each other, and a substantially parallel light beam emitted from a light projecting means is reflected by an object to be detected. And receiving light by the light receiving means, and setting one of a light receiving area of the detection object to be irradiated with light from the light projecting means and a light receiving area of the detection object by the light receiving means in a band shape, and A detection head of a reflection type photoelectric switch in which the other is set in a part of the band-shaped region in the longitudinal direction, wherein a rod-shaped light-reflecting window of the detection head reflects light from the light-emitting means and the object to be detected. A detection head of a reflection type photoelectric switch in which a reflection prism is provided so that a plane including an optical path inside the detection head is set to be substantially orthogonal to a plane including an optical path inside the detection head.
するように設定して、投光手段から出射された略平行な
光束を検出対象物で反射させ、該反射させた反射光を受
光手段により受光すると共に、 前記検出対象物における前記投光手段からの光が照射さ
れる照射領域と、前記検出対象物における前記受光手段
によって受光する受光領域の一方を帯状に設定し、か
つ、他方を前記帯状の領域における長手方向の一部分に
設定した反射型光電スイッチの検出ヘッドであって、 該検出ヘッドに前記帯状の投光領域または受光領域に対
応する帯状の投受光窓を設け、 該検出ヘッドの投受光窓に棒状の反射プリズムを設け、 前記投光手段として、投光用光ファイバと該投光用光フ
ァイバからの光を略平行な平行光にして前記反射プリズ
ムの反射面に向って出射する投光レンズとを設け、 前記受光手段として、前記反射プリズムの前記反射面に
入射した検出対象物からの反射光を集光する受光レンズ
と、該受光レンズからの光を受光する受光用光ファイバ
とを設け、 前記投受光レンズの光軸および前記両光ファイバの軸線
を、検出ヘッドの筐体内の一平面上に配置すると共に、 前記反射プリズムの前記反射面で反射されて出射される
光の光路および前記検出対象物から前記反射面に向って
入射する光の光路を含む平面と、前記光学要素を配置し
た前記一平面とが略直交するように設定されている反射
型光電スイッチの検出ヘッド。2. An optical system according to claim 1, wherein the light projecting axis and the light receiving axis of the optical system are set so as to intersect each other, and the substantially parallel light flux emitted from the light projecting means is reflected by the object to be detected. And receiving light by the light receiving means, and setting one of a light receiving area of the detection object to be irradiated with light from the light projecting means and a light receiving area of the detection object by the light receiving means in a band shape, and A detection head of a reflection type photoelectric switch in which the other is set in a part of the band-shaped region in the longitudinal direction, wherein the detection head is provided with a band-shaped light transmission / reception window corresponding to the band-shaped light transmission region or light reception region, A rod-shaped reflecting prism is provided in the light projecting / receiving window of the detection head, and the light projecting means converts the light from the projecting optical fiber and the light from the projecting optical fiber into substantially parallel parallel light, and the reflecting surface of the reflecting prism. To A light-receiving lens for collecting reflected light from a detection target incident on the reflection surface of the reflection prism, and receiving light from the light-receiving lens as the light-receiving means. A light receiving optical fiber, an optical axis of the light emitting / receiving lens and an axis of the two optical fibers are arranged on a plane in a housing of the detection head, and the light is reflected by the reflecting surface of the reflecting prism and emitted. The reflection type photoelectric conversion device is set such that the plane including the optical path of the light to be detected and the optical path of the light incident from the detection target toward the reflection surface is substantially orthogonal to the one plane on which the optical element is arranged. Switch detection head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5286698A JPH11232972A (en) | 1998-02-17 | 1998-02-17 | Detection head of reflecting type photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5286698A JPH11232972A (en) | 1998-02-17 | 1998-02-17 | Detection head of reflecting type photoelectric switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11232972A true JPH11232972A (en) | 1999-08-27 |
Family
ID=12926801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5286698A Pending JPH11232972A (en) | 1998-02-17 | 1998-02-17 | Detection head of reflecting type photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11232972A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009302105A (en) * | 2008-06-10 | 2009-12-24 | Hitachi High-Tech Instruments Co Ltd | Electronic component mounting apparatus and board processing apparatus |
-
1998
- 1998-02-17 JP JP5286698A patent/JPH11232972A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009302105A (en) * | 2008-06-10 | 2009-12-24 | Hitachi High-Tech Instruments Co Ltd | Electronic component mounting apparatus and board processing apparatus |
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