JPH0660947U - Monocular reflective photoelectric switch - Google Patents
Monocular reflective photoelectric switchInfo
- Publication number
- JPH0660947U JPH0660947U JP329493U JP329493U JPH0660947U JP H0660947 U JPH0660947 U JP H0660947U JP 329493 U JP329493 U JP 329493U JP 329493 U JP329493 U JP 329493U JP H0660947 U JPH0660947 U JP H0660947U
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- photoelectric switch
- receiving element
- monocular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
(57)【要約】
【目的】 製作が困難で高価なフレネルレンズを使用し
なくても、小型化をはかると共に、至近距離での受光特
性を改善し、信頼性の高い単眼反射形光電スイッチを実
現する。
【構成】 投光素子から出射された光を検出物体に照射
し、この検出物体からの反射光を受光素子で受光し、そ
の受光信号の変化によって、前記検出物体を検出する構
成であって、前記投受光素子は一体形とされ、かつ投受
光系の光軸を同軸とした単眼反射形光電スイッチにおい
て、前記投受光系は１枚の非球面レンズで構成したこと
を特徴とする。また、前記一体形の投受光素子の入出射
窓は、中央部分が球面レンズで、その他の部分はフラッ
トに形成されたことを特徴とする。また、前記一体形の
投受光素子にシールド処理を施したことを特徴とする。
(57) [Abstract] [Purpose] A highly reliable monocular reflection type photoelectric switch that can be made compact without using an expensive Fresnel lens that is difficult to manufacture and has improved light receiving characteristics at a close range. To be realized. A configuration in which light emitted from a light projecting element is applied to a detection object, reflected light from the detection object is received by a light receiving element, and the detection object is detected by a change in the light reception signal, In the monocular reflection type photoelectric switch in which the light emitting / receiving element is integrated and the optical axis of the light emitting / receiving system is coaxial, the light emitting / receiving system is composed of one aspherical lens. Further, the input / output window of the integrated light emitting / receiving element is characterized in that the central portion is formed of a spherical lens and the other portions are formed flat. Further, it is characterized in that the integrated light emitting / receiving element is shielded.
Description
【０００１】[0001]
本考案は、反射形光電スイッチに関し、特に小型化と至近距離での検出を可能 にした単眼反射形光電スイッチに関するものである。 The present invention relates to a reflection type photoelectric switch, and more particularly to a monocular reflection type photoelectric switch capable of miniaturization and detection at a close range.
【０００２】[0002]
このような単眼反射形光電スイッチとして、図４に示す特開昭６４−１７３４ ７号『反射型光電スイッチ』がある。 図４において、レンズ２はマイクロフレネルレンズであり、同心円状の２つの レンズ要素２ａと２ｂからなる。中央の円形のレンズ要素２ａの焦点距離ｆ1 と 周辺部の円環状レンズ要素２ｂの焦点距離ｆ2 とは異なり、かつｆ1 ＜ｆ2 とな るように、これらのフレネルレンズ要素２ａ，２ｂのゾーンの周期が設定されて いる。マイクロフレネルレンズ２から焦点距離ｆ1 の位置に投光素子１、レンズ ２から焦点距離ｆ2 よりも短くかつ焦点距離ｆ1 よりも長い適当な距離ｄの位置 に受光素子４が配置される。これらの投受光素子１，４は同じ光軸上に配置され る。投光素子１から出射した光は、マイクロフレネルレンズ２の中央部のレンズ 要素２ａによってほぼ平行光Ｌe に変換され、距離Ｌ離れた検出物体３に向かう 。この検出物体３で反射された光Ｌr は、マイクロフレネルレンズ２に入射する 。そして、反射光の内、周辺部のレンズ要素２ｂによって集光され、受光素子４ によって受光される。受光素子４の受光信号の変化に基づいて物体検知信号が生 成される。As such a monocular reflection type photoelectric switch, there is JP-A-64-17347 "Reflection type photoelectric switch" shown in FIG. In FIG. 4, the lens 2 is a micro Fresnel lens, and is composed of two concentric lens elements 2a and 2b. Unlike the focal length f 2 of the toric lens element 2b of the focal length f 1 and the peripheral portion of the central circular lens element 2a, and the Do so that the f 1 <f 2, these Fresnel lens elements 2a, 2b The cycle of the zone is set. The light projecting element 1 is arranged at a position of a focal length f 1 from the micro Fresnel lens 2, and the light receiving element 4 is arranged at a position of an appropriate distance d from the lens 2 which is shorter than the focal length f 2 and longer than the focal length f 1 . These light emitting / receiving elements 1 and 4 are arranged on the same optical axis. The light emitted from the light projecting element 1 is converted into substantially parallel light L e by the lens element 2 a at the center of the micro Fresnel lens 2 and travels toward the detection object 3 that is a distance L away. The light L r reflected by the detection object 3 enters the micro Fresnel lens 2. Then, of the reflected light, it is condensed by the lens element 2 b in the peripheral portion and received by the light receiving element 4. An object detection signal is generated based on the change in the light receiving signal of the light receiving element 4.
【０００３】[0003]
このように、図４に示す単眼反射形光電スイッチは、コリメータレンズと集光 レンズを１枚の２焦点レンズで置き換えて構成されていた。しかしながら、この ２焦点レンズがフレネルレンズであるため、製作が困難で、高価であるという欠 点があった。 As described above, the monocular reflection type photoelectric switch shown in FIG. 4 is configured by replacing the collimator lens and the condenser lens with one bifocal lens. However, since the bifocal lens is a Fresnel lens, it is difficult to manufacture and is expensive.
【０００４】 本考案は、上記従来技術の課題を踏まえて成されたものであり、製作が困難で 高価なフレネルレンズを使用しなくても、小型化をはかると共に、至近距離での 受光特性を改善し、信頼性の高い単眼反射形光電スイッチを提供することを目的 としたものである。The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to achieve miniaturization and light receiving characteristics at a close range without using an expensive Fresnel lens that is difficult to manufacture and expensive. The object is to provide an improved and highly reliable single-eye reflective photoelectric switch.
【０００５】[0005]
上記課題を解決するための本考案の構成は、 投光素子から出射された光を検出物体に照射し、この検出物体からの反射光を 受光素子で受光し、その受光信号の変化によって、前記検出物体を検出する構成 であって、前記投受光素子は一体形とされ、かつ投受光系の光軸を同軸とした単 眼反射形光電スイッチにおいて、 前記投受光系は１枚の非球面レンズで構成したことを特徴とする。 また、前記一体形の投受光素子の入出射窓は、中央部分が球面レンズで、その 他の部分はフラットに形成されたことを特徴とする。 また、前記一体形の投受光素子にシールド処理を施したことを特徴とする。 The configuration of the present invention for solving the above-mentioned problems is to irradiate a detection object with light emitted from a light projecting element, receive reflected light from this detection object with a light receiving element, and change the received light signal to A single eye reflection type photoelectric switch having a structure for detecting a detection object, wherein the light emitting / receiving element is integrated, and the optical axis of the light emitting / receiving system is coaxial, wherein the light emitting / receiving system is a single aspherical lens. It is characterized in that it is configured with. Further, the input / output window of the integrated light emitting / receiving element is characterized in that the central portion is a spherical lens and the other portions are formed flat. Further, it is characterized in that the integrated light emitting / receiving element is shielded.
【０００６】[0006]
本考案によれば、投受光系にマイクロフレネルレンズの代わりに、製作が容易 で安価な非球面レンズを用いて、単眼反射形光電スイッチを構成している。 According to the present invention, a monocular reflection type photoelectric switch is configured by using an aspherical lens which is easy to manufacture and is inexpensive, instead of the micro Fresnel lens for the light emitting and receiving system.
【０００７】[0007]
以下、本考案を図面に基づいて説明する。 図１は本考案の単眼反射形光電スイッチの一実施例を示す断面構成図である。 図１において、光学系は非球面レンズ５と一体形の投受光素子１，４から構成 される。投受光素子１，４において、入出射窓６の中央部分が球面レンズ６ａで 、他の部分はフラットな部分６ｂになっている。また、投光素子１と受光素子４ は、同軸上に離れて配置されている。また、投光素子１に対してシールド処理が 施されている（シールド処理がされていない場合は、ノイズに対して弱い）。 Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the monocular reflection type photoelectric switch of the present invention. In FIG. 1, the optical system comprises an aspherical lens 5 and light emitting / receiving elements 1 and 4 integrally formed. In the light emitting / receiving elements 1 and 4, the central portion of the entrance / exit window 6 is a spherical lens 6a, and the other portions are flat portions 6b. The light projecting element 1 and the light receiving element 4 are arranged coaxially and apart from each other. Further, the light projecting element 1 is shielded (when not shielded, it is vulnerable to noise).
【０００８】 このような構成において、投光素子１から出射された光は、窓６上の球面レン ズ６ａと非球面レンズ５を通過した後、光軸に平行な光線となる。実際には、投 光素子１が面発光素子であり、非球面レンズ５を通過した光ビームは、光軸に対 して±２°程度の広がり角度を持つ。この光ビームに照射された図示しない検出 物体からの散乱光の内、光軸に平行な成分が逆に非球面レンズ５に入射し、投受 光一体形の素子１，４の窓６上のフラットな部分６ｂを通過した後、受光素子４ に集束する。したがって、受光素子４に光が入射してくるか否かで、物体の有無 を検出する。In such a configuration, the light emitted from the light projecting element 1 passes through the spherical lens 6a on the window 6 and the aspherical lens 5, and then becomes a light beam parallel to the optical axis. Actually, the light projecting element 1 is a surface emitting element, and the light beam passing through the aspherical lens 5 has a divergence angle of about ± 2 ° with respect to the optical axis. Of the scattered light from the detection object (not shown) irradiated on this light beam, the component parallel to the optical axis is incident on the aspherical lens 5 in reverse, and is flat on the window 6 of the integrated light-receiving elements 1 and 4. After passing through the different portion 6b, it is focused on the light receiving element 4. Therefore, the presence or absence of an object is detected depending on whether or not light is incident on the light receiving element 4.
【０００９】 また、至近距離（非球面レンズ５と検出物体間の距離が１０ｍｍ以下）では、 平行光の他に、図２に示す光線軌跡に示すように、光軸に対して或る角度を持っ た光も、受光素子４に入射することができる。つまり、至近距離から遠距離まで の幅広い範囲で物体の有無を検出できることになる。Further, at a close range (the distance between the aspherical lens 5 and the detected object is 10 mm or less), in addition to the parallel light, as shown by the ray trace shown in FIG. The held light can also enter the light receiving element 4. In other words, the presence / absence of an object can be detected in a wide range from a close range to a long range.
【００１０】 なお、上記実施例において、シールド効果をさらに高めるためには、図３に示 すように、シールドの端子と受光素子カソードを分離すれば良い。In the above embodiment, in order to further enhance the shield effect, the shield terminal and the light-receiving element cathode may be separated as shown in FIG.
【００１１】 このように、上記実施例では、投受光系にマイクロフレネルレンズの代わりに 、製作が容易で安価な非球面レンズを用いて、単眼反射形光電スイッチを構成し ており、製作が困難で高価なフレネルレンズを使用しなくても、小型化をはかれ 、至近距離での受光特性を改善している。As described above, in the above-described embodiment, the monocular reflection type photoelectric switch is configured by using the aspherical lens which is easy to manufacture and is inexpensive, instead of the micro Fresnel lens in the light emitting / receiving system, which is difficult to manufacture. Even without using an expensive Fresnel lens, the size can be reduced and the light receiving characteristics at close range are improved.
【００１２】[0012]
以上、実施例と共に具体的に説明したように、本考案によれば、製作が困難で 高価なフレネルレンズを使用しなくても、小型化をはかると共に、至近距離での 受光特性を改善し、信頼性の高い単眼反射形光電スイッチを実現できる。 As described above in detail with reference to the embodiments, according to the present invention, it is possible to reduce the size and improve the light receiving characteristics at a close range without using an expensive Fresnel lens that is difficult to manufacture and expensive. It is possible to realize a highly reliable monocular reflective photoelectric switch.
【図１】本考案の単眼反射形光電スイッチの一実施例を
示す断面構成図である。FIG. 1 is a cross-sectional configuration diagram showing an embodiment of a monocular reflective photoelectric switch of the present invention.
【図２】図１装置での至近距離での光線軌跡を示す図で
ある。FIG. 2 is a diagram showing a ray trace at a close range in the apparatus of FIG.
【図３】シールドを施した投受光素子部分の拡大図であ
る。FIG. 3 is an enlarged view of a shielded light emitting / receiving element portion.
【図４】単眼反射形光電スイッチの従来例である。FIG. 4 is a conventional example of a monocular reflective photoelectric switch.
Claims (3)
照射し、この検出物体からの反射光を受光素子で受光
し、その受光信号の変化によって、前記検出物体を検出
する構成であって、前記投受光素子は一体形とされ、か
つ投受光系の光軸を同軸とした単眼反射形光電スイッチ
において、 前記投受光系は１枚の非球面レンズで構成したことを特
徴とする単眼反射形光電スイッチ。1. A structure in which light emitted from a light projecting element is applied to a detection object, reflected light from the detection object is received by a light receiving element, and the detection object is detected by a change in the light reception signal. In the single-eye reflection type photoelectric switch in which the light emitting / receiving element is integrated and the optical axis of the light emitting / receiving system is coaxial, the light emitting / receiving system is composed of one aspherical lens. Reflective photoelectric switch.
中央部分が球面レンズで、その他の部分はフラットに形
成されたことを特徴とする請求項１記載の単眼反射形光
電スイッチ。2. The input / output window of the integrated light emitting / receiving element,
The monocular reflection type photoelectric switch according to claim 1, wherein the central portion is a spherical lens and the other portions are formed flat.
を施したことを特徴とする請求項１または２記載の単眼
反射形光電スイッチ。3. The monocular reflection type photoelectric switch according to claim 1, wherein the integrated light emitting / receiving element is shielded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP329493U JPH0660947U (en) | 1993-02-08 | 1993-02-08 | Monocular reflective photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP329493U JPH0660947U (en) | 1993-02-08 | 1993-02-08 | Monocular reflective photoelectric switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0660947U true JPH0660947U (en) | 1994-08-23 |
Family
ID=11553368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP329493U Pending JPH0660947U (en) | 1993-02-08 | 1993-02-08 | Monocular reflective photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660947U (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945444A (en) * | 1972-09-06 | 1974-04-30 | ||
| JPS5364489A (en) * | 1976-11-22 | 1978-06-08 | Toshiba Corp | Photo semiconductor device |
| JPS6142975A (en) * | 1984-08-06 | 1986-03-01 | S M K Kk | Photo transmission element |
| JPS63144550A (en) * | 1986-12-09 | 1988-06-16 | Mitsubishi Electric Corp | Optical digital link module |
| JPS6417347A (en) * | 1987-07-10 | 1989-01-20 | Omron Tateisi Electronics Co | Reflection type photoelectric switch |
| JPH0120750B2 (en) * | 1981-12-22 | 1989-04-18 | Oki Electric Ind Co Ltd |
-
1993
- 1993-02-08 JP JP329493U patent/JPH0660947U/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4945444A (en) * | 1972-09-06 | 1974-04-30 | ||
| JPS5364489A (en) * | 1976-11-22 | 1978-06-08 | Toshiba Corp | Photo semiconductor device |
| JPH0120750B2 (en) * | 1981-12-22 | 1989-04-18 | Oki Electric Ind Co Ltd | |
| JPS6142975A (en) * | 1984-08-06 | 1986-03-01 | S M K Kk | Photo transmission element |
| JPS63144550A (en) * | 1986-12-09 | 1988-06-16 | Mitsubishi Electric Corp | Optical digital link module |
| JPS6417347A (en) * | 1987-07-10 | 1989-01-20 | Omron Tateisi Electronics Co | Reflection type photoelectric switch |
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