JP4014670B2

JP4014670B2 - Optical sensor

Info

Publication number: JP4014670B2
Application number: JP10066896A
Authority: JP
Inventors: 勝也小山
Original assignee: Keyence Corp
Current assignee: Keyence Corp
Priority date: 1996-03-16
Filing date: 1996-03-16
Publication date: 2007-11-28
Anticipated expiration: 2016-03-16
Also published as: JPH09251104A

Description

【０００１】
【発明の属する技術分野】
本発明は、光センサに関するものである。
【０００２】
【従来の技術】
光電スイッチ等の光センサとして、所定の大きさの光線束を出射する投光部と、この投光部から出射された光線束を入射する受光部とを有し、投光部の光線束出射面と受光部の入射面とを結ぶ光線束領域内、すなわち検出領域内に位置して光線束の一部あるいは全部の伝搬を遮ることにより物体を検出する光センサは良く知られている。
【０００３】
図４は、このような光センサの構成例の概略を示すもので、１は投光部で、光源１１、絞り１２、凹レンズ１３、反射部材１４、凸レンズ１５とで構成され、光源１１から出射された光を絞り１２、凹レンズ１３、反射部材１４を介して凸レンズ１５に入射し、凸レンズ１５で所定の大きさの平行光線束にして出射するようにされている。また、２は受光部で、凸レンズ２１、反射部材２２、光ファイバー２３とで構成され、投光部１から出射された平行光線束を凸レンズ２１に入射し、反射部材２２を介して光ファイバー２３の端面に集光するようにされている。なお、３は被検出物体である。
【０００４】
【発明が解決しようとする課題】
このように構成される光センサでは、光源１１から出射される光は絞り１２により絞られ全体の光量が少なく、また、光軸近傍は光量が多く光軸から遠くなるに連れ光量が減少して検出領域内の光量の分布が不均一となり、検出距離が長くとれないばかりでなく、検出領域の光量の少ない端部付近に位置する被検出物体の検出精度を高めなければならないという問題がある。
【０００５】
さらには、特に投光部において、絞り１２、凹レンズ１３、反射部材１４、凸レンズ１５と部品点数が多く、これらの部品それぞれの配置位置の調整に手間どるという問題もある。
【０００６】
本発明は、上記の問題に鑑みなされたもので、検出領域の光量の分布の均一化を図ることができるとともに、光学系の組立て部品点数を少なくし、光学系部品の配置位置の調整が簡単にできる光センサを提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の目的は、下記（１）〜（５）とすることにより達成される。
【００１１】
（１）光源からの光を入射面から入射し、入射した光を所定の大きさの光線束にして出射面から出射する第１の光学レンズと、前記第１の光学レンズから出射された光線束を入射面から入射し、入射した光を集束光にして出射面から出射する第２の光学レンズを有し、前記第２の光学レンズから出射された光により、前記第１の光学レンズの出射面と前記第２の光学レンズの入射面との間に位置する被検出物体を検出してなる光センサにおいて、前記第１の光学レンズの入射面と出射面および前記第２の光学レンズの入射面と出射面のうち少なくとも一つの面と対向して、光軸近傍では狭く、光軸から遠くなるにつれて広くなるように形成された略瓢箪形状の光透過開口を形成した遮蔽体を設けたことを特徴とする光センサ。
（２）上記の光センサにおいて、略瓢箪形状の光透過開口を形成した遮蔽体と対向する光学レンズの面が第１及び／又は第２の光学レンズの入射面としてなることを特徴とする。
（３）光源からの光を入射面から入射し、入射した光を所定の大きさの光線束にして出射面から出射する第１の光学レンズと、前記第１の光学レンズから出射された光線束を入射面から入射し、入射した光を集束光にして出射面から出射する第２の光学レンズを有し、前記第２の光学レンズから出射された光により、前記第１の光学レンズの出射面と前記第２の光学レンズの入射面との間に位置する被検出物体を検出してなる光センサにおいて、前記第１の光学レンズの入射面と出射面および前記第２の光学レンズの入射面と出射面のうち少なくとも一つの面と対向して、光軸近傍では狭く、光軸から遠くなるにつれて広くなるように形成された略瓢箪形状の光透過開口を形成した遮蔽体を設けるとともに、前記第１の光学レンズと第２の光学レンズのいずれか一方のレンズまたは両方のレンズに入射面から入射した光を出射面へ反射する反射面を設けたことを特徴とする光センサ。
（４）光源からの光を入射面から入射し、入射した光を所定の大きさの光線束にして出射面から出射する第１の光学レンズと、前記第１の光学レンズから出射された光線束を入射面から入射し、入射した光を集束光にして出射面から出射する第２の光学レンズを有し、前記第２の光学レンズから出射された光により、前記第１の光学レンズの出射面と前記第２の光学レンズの入射面との間に位置する被検出物体を検出してなる光センサにおいて、前記第１の光学レンズと第２の光学レンズのいずれか一方のレンズまたは両方のレンズに入射面から入射した光を出射面へ反射する反射面を設け、前記第１の光学レンズと第２の光学レンズのいずれか一方のレンズまたは両方のレンズに形成した反射面の少なくとも一つ反射面を、光軸近傍では狭く、光軸から遠くなるにつれて広くなるように形成された略瓢箪形状としてなることを特徴とする光センサ。
（５）上記（１）〜（４）に記載の光センサにおいて、第１の光学レンズ及び／又は第２の光学レンズの入射面に凹レンズを形成する凹部を形成してなることを特徴とする。
【００１３】
【発明の実施の形態】
本発明に係る光学レンズは、レンズの光の入射面あるいは出射面、レンズに反射面が形成されてある場合にはその反射面のいずれかの面に、その面に到達する光量の分布に対応した形状の遮蔽手段（反射面の場合は反射体を除く反射面自体の形状）、言い替えれば光軸近傍は出射光量を少なくし、光軸から遠くなるに連れ出射光量を多くする手段が形成されている。したがって、この光学レンズから出射される光量の分布は均一化される。
【００１４】
また、本発明に係る光センサは、上記本発明に係る光学レンズを用いて構成される。したがって、光源から出射される光量の多くを利用でき、また、出射される光量の分布が均一化されることから、被検出物体の検出精度を簡単に高めることができ、更に、前記の本発明に係る光学レンズを投光部側に用いることにより、検出距離が長くとれる。更にまた、前記の本発明に係る光学レンズを投光部側に用いる場合に、前記レンズの入射面を凹面に形成し、その凹面の入射面に前記遮蔽手段を形成すると、部品点数の極めて少ない簡素な構造の光センサを得ることができる。
【００１５】
【実施例】
以下、図１ないし図３を参照して本発明の実施例について説明する。図１は、本発明の実施例の光センサの投光部の構成を示す平面図、図２は本発明の実施例のレンズの斜視図、図３は、本発明の実施例の光センサの説明図である。なお図１ないし図３において対応する部分には同一の符号が付されている。
【００１６】
まず、図３において、５０は光センサで、６１は投光部、８１は受光部である。投光部６１は、光を出射する開口６３を形成した筐体６２とこの筐体６２の内部で光ファイバー６４の端部を固定し、光ファイバー６４内を伝搬してその先端面から出射する光を入射し、平行光線束９０を出射するレンズが設けられている。筐体６２の大きさは厚みｃが約４ｍｍ、縦ｂ及び横ａが約２０ｍｍとされ、平行光線束９０、すなわち被検出物体の検出領域は縦ｄが１０ｍｍ、横ｅが３ｍｍの断面長方形状とされている。
【００１７】
受光部８１は、平行光線束９０を入射する開口８３を形成した投光部６１の筐体６２と同程度の大きさの筐体８２とこの筐体８２の内部で光ファイバー８４の端部を固定し、入射した平行光線束９０を集光して光ファイバー８４の端面に出射するレンズが設けられている。
【００１８】
図１は、図３に示された光センサ５０の投光部６１の筐体６２の片方側面を外して示す筐体６２の内部の平面図で、６６はレンズである。レンズ６６および光ファイバー６４の端部６４ａは筐体６２の内側に形成された凹部６５に嵌合させ、同様の凹部が形成された片方側面とにより挾んで固定される。
【００１９】
レンズ６６は、図示しない光源から光ファイバー６４内を伝搬して光ファイバー６４の端部６４ａの先端面から出射する光を入射する入射面６７と球面状に形成された出射面６８と平坦に形成された反射面６９を備えた透明体の平板状で構成されている。図２は、レンズ６６の斜視図で図１と併せ説明すると、入射面６７には、底面を球面状にした細長い凹部７０、つまり凹レンズが形成され、その凹部７０の長さ方向に対する中央部の対向する側面を接近させて形成され、その凹部７０の開口面は図２に示すように瓢箪形状の広狭の開口面７１にされている。
【００２０】
なお、このような凹部７０、つまり凹レンズは、光ファイバー６４の端部６４ａの先端面から出射される光の入射面６７に対する入射角度による屈折を補正し直進性を維持するために形成されたものであり、また、開口面７１の瓢箪形状は、光ファイバー６４の先端面から出射する光量が中央部が多い場合であり、幅の狭い部分は光ファイバー６４の端面から出射する光量、すなわち入射面６７に到達する光量の分布に応じてその形状は変えられる。
【００２１】
そして、開口面７１を除く入射面６７の面は、光ファイバー６４の先端面から出射された光をレンズ６６の肉厚内部に入射されないように乱反射あるいは反射する遮蔽面に形成されている。レンズ６６の反射面６９には反射体７２がアルミ蒸着等により形成されていて、入射面６７の開口面７１から入射された光は反射体７２で反射し、出射面６８へ伝搬され、出射面６８で光軸と平行する光線とされて外部、すなわち被検出物体の検出領域に出射される。なお、この実施例では、反射面６９は広く形成され、その一部に反射体７２を形成して実際の反射面とされている。したがって、反射体７２以外の面に到達する光は外部に放出される。
【００２２】
このように構成されるレンズ６６は、入射される光が入射面６７の開口面７１の形状に従い光量の分布が開口面７１の長手方向に対して均一化され、出射される光量の分布も被検出物体の検出領域の縦方向に対して均一化される。なお、この実施例では、レンズ６６の反射面６９は、入射光線軸と出射光線軸とのなす角度αが７６度、反射面６９と出射光線軸とのなす角度βが５２度となる傾斜面にされている。
【００２３】
上記の実施例では、レンズ６６の入射面６７に、その面に到達する光量の分布に対応した形状の遮蔽手段（瓢箪形状の入射部（開口面７１）を除く部分）が形成されているが、このような遮蔽手段は出射面６８に形成されても良く、また、反射面６９に形成されても良い。この場合、反射体７２を開口面７１の瓢箪形状と同様に反射面６９に到達する光量の分布に対応した広狭の形状とし、反射体７２から外れる光を反射面６９の反射体７２以外の面から外部に放出し、この放出は、レンズ６６の出射面６８へ伝搬される光に対して遮蔽されることになる。
【００２４】
更に、このような遮蔽手段は受光部８１のレンズの入射面あるいは出射面に形成されても良い。この場合、投光部６１のレンズにはこのような遮蔽手段を形成する必要はなくなる。なお、レンズに形成した反射面は必ず必要とするものではなく、光ファイバーの配置との関係により省略されても良い。
【００２５】
また、上記の実施例では、光源から光ファイバー６４内を伝搬してその先端面から出射する光を用いているが、発光素子等からなる光源自体を光ファイバー６４の端部６４ａの位置に配置するようにしても良い。この場合、光ファイバー６４は光源を駆動する電線に置き換えられる。同様に受光部８１において、光ファイバー８４に換えて電線ケーブルとし、入射した平行光線束９０を集光して受光素子に出射するようにしても良い。
【００２６】
【発明の効果】
以上詳述したように本発明によれば、光学レンズから出射される光量の分布は均一化され、被検出物体の検出精度を簡単に高めることができる。また、光ファイバーの端面等から出射される光量の多くを利用することができ、検出距離を長くすることができる。さらに、光学レンズに光学系の凹レンズ、遮蔽手段、反射面が形成されるので、光学系の組立て部品点数が少なく、光学系部品の配置位置の調整が簡単となる。
【図面の簡単な説明】
【図１】本発明の実施例の光センサの投光部の構成を示す平面図である。
【図２】本発明の実施例のレンズの斜視図である。
【図３】本発明の実施例の光センサの説明図である。
【図４】光センサの一例の概略を示す構成図である。
【符号の説明】
５０光センサ
６１投光部
６２、８２筐体
６３、８３開口
６４、８４光ファイバー
６５筐体の凹部
６６光学レンズ
６７入射面
６８出射面
６９反射面
７０凹部（凹レンズ）
７１入射開口部
７２反射体
８１受光部[0001]
BACKGROUND OF THE INVENTION
The present invention is related to an optical sensor.
[0002]
[Prior art]
As an optical sensor such as a photoelectric switch, it has a light projecting unit that emits a light bundle of a predetermined size, and a light receiving unit that receives the light bundle emitted from the light projecting unit, and emits the light bundle of the light projecting unit 2. Description of the Related Art An optical sensor that detects an object by blocking the propagation of a part or all of a light beam located in a light beam region connecting a surface and an incident surface of a light receiving unit, that is, in a detection region, is well known.
[0003]
FIG. 4 shows an outline of a configuration example of such an optical sensor. Reference numeral 1 denotes a light projecting unit, which includes a light source 11, a diaphragm 12, a concave lens 13, a reflecting member 14, and a convex lens 15, and is emitted from the light source 11. The incident light is incident on the convex lens 15 through the diaphragm 12, the concave lens 13, and the reflecting member 14, and is emitted as a parallel light beam having a predetermined size by the convex lens 15. Reference numeral 2 denotes a light receiving portion which is composed of a convex lens 21, a reflecting member 22, and an optical fiber 23. It is supposed to be condensed. Reference numeral 3 denotes an object to be detected.
[0004]
[Problems to be solved by the invention]
In the optical sensor configured as described above, the light emitted from the light source 11 is reduced by the diaphragm 12 so that the total amount of light is small, and the amount of light in the vicinity of the optical axis is large and the amount of light decreases as the distance from the optical axis increases. There is a problem that the distribution of the amount of light in the detection region becomes non-uniform and the detection distance cannot be increased, and the detection accuracy of the detection object located near the end portion where the light amount of the detection region is small must be increased.
[0005]
Furthermore, particularly in the light projecting portion, there are a large number of parts such as the stop 12, the concave lens 13, the reflecting member 14, and the convex lens 15, and there is a problem that it takes time to adjust the arrangement positions of these parts.
[0006]
The present invention has been made in view of the above problems, it is possible to achieve uniform distribution of the light amount of the detection region, to reduce the assembling parts of the optical science system, the adjustment of the position of the optical components It is an object of the present invention to provide an optical sensor that can be simplified.
[0007]
[Means for Solving the Problems]
The object of the present invention is achieved by the following (1) to (5).
[0011]
(1) Light from a light source is incident from an incident surface, and the incident light is converted into a bundle of rays having a predetermined size and emitted from an emission surface; and the light emitted from the first optical lens. A bundle is incident from the incident surface, and a second optical lens that emits the incident light as focused light and exits from the exit surface. The light emitted from the second optical lens is used to generate the bundle of light from the first optical lens. In an optical sensor configured to detect an object to be detected positioned between an exit surface and an entrance surface of the second optical lens, the entrance surface and the exit surface of the first optical lens, and the second optical lens Provided with a shield having a substantially bowl-shaped light transmission opening formed so as to face at least one of the entrance surface and the exit surface and to be narrow in the vicinity of the optical axis and widen with increasing distance from the optical axis. An optical sensor characterized by the above .
(2) In the above-described optical sensor, the surface of the optical lens facing the shield having a substantially bowl-shaped light transmission aperture is the incident surface of the first and / or second optical lens.
(3) A first optical lens that makes light from a light source incident from an incident surface, makes the incident light a bundle of rays having a predetermined size, and emits the light from the output surface; and a light beam emitted from the first optical lens. A bundle is incident from the incident surface, and a second optical lens that emits the incident light as focused light and exits from the exit surface. The light emitted from the second optical lens is used to generate the bundle of light from the first optical lens. In an optical sensor configured to detect an object to be detected positioned between an exit surface and an entrance surface of the second optical lens, the entrance surface and the exit surface of the first optical lens, and the second optical lens Provided with a shield having a substantially bowl-shaped light transmission opening formed so as to face at least one of the entrance surface and the exit surface and to be narrow in the vicinity of the optical axis and widen as the distance from the optical axis increases. The first optical lens and the second light Optical sensor is characterized by providing a reflective surface for reflecting the emission surface of the light incident from the incident surface on one of the lens or both lenses of the lens.
(4) A first optical lens that makes light from a light source incident from an incident surface, makes the incident light a bundle of rays having a predetermined size, and emits the light from the emission surface; and a light beam emitted from the first optical lens. A bundle is incident from the incident surface, and a second optical lens that emits the incident light as focused light and exits from the exit surface. The light emitted from the second optical lens is used to generate the bundle of light from the first optical lens. In an optical sensor configured to detect a detection object positioned between an emission surface and an incident surface of the second optical lens, either one or both of the first optical lens and the second optical lens A reflecting surface that reflects light incident from the incident surface to the exit surface is provided on at least one of the first optical lens and the second optical lens, or at least one of the reflecting surfaces formed on both lenses. One reflecting surface is narrow near the optical axis , An optical sensor, characterized by comprising a substantially gourd shape formed to be wider as distance from the optical axis.
(5) In the optical sensor according to (1) to (4), a concave portion for forming a concave lens is formed on the incident surface of the first optical lens and / or the second optical lens. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The optical lens according to the present invention corresponds to the distribution of the amount of light reaching the surface on either the light incident surface or the light exit surface of the lens, or when any reflective surface is formed on the lens. Shielding means with the shape (in the case of a reflecting surface, the shape of the reflecting surface itself excluding the reflector), in other words, a means for decreasing the amount of emitted light near the optical axis and increasing the amount of emitted light as the distance from the optical axis increases. ing. Therefore, the distribution of the amount of light emitted from the optical lens is made uniform.
[0014]
Moreover, the optical sensor according to the present invention is configured using the optical lens according to the present invention. Therefore, most of the amount of light emitted from the light source can be used, and since the distribution of the amount of emitted light is made uniform, the detection accuracy of the object to be detected can be easily increased. By using the optical lens according to the above on the light projecting unit side, the detection distance can be increased. Furthermore, when the optical lens according to the present invention is used on the light projecting portion side, if the incident surface of the lens is formed as a concave surface and the shielding means is formed on the incident surface of the concave surface, the number of parts is extremely small. An optical sensor having a simple structure can be obtained.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a configuration of a light projecting portion of an optical sensor according to an embodiment of the present invention, FIG. 2 is a perspective view of a lens according to the embodiment of the present invention, and FIG. It is explanatory drawing. In FIG. 1 to FIG. 3, the same reference numerals are given to corresponding parts.
[0016]
First, in FIG. 3, 50 is an optical sensor, 61 is a light projecting unit, and 81 is a light receiving unit. The light projecting unit 61 fixes the end portion of the optical fiber 64 inside the housing 62 in which the opening 63 for emitting light is formed and the inside of the housing 62, and propagates the light in the optical fiber 64 to emit the light emitted from the front end surface. A lens that enters and exits the parallel beam bundle 90 is provided. The size of the casing 62 is about 4 mm in thickness c, about 20 mm in length b and width a, and the parallel light beam 90, that is, the detection area of the detected object has a rectangular cross section with a length d of 10 mm and a width e of 3 mm. It is said that.
[0017]
The light receiving unit 81 fixes the end of the optical fiber 84 inside the case 82 and the case 82 having the same size as the case 62 of the light projecting unit 61 in which the opening 83 for entering the parallel light beam 90 is formed. In addition, a lens that collects the incident parallel light bundle 90 and emits it to the end face of the optical fiber 84 is provided.
[0018]
FIG. 1 is a plan view of the inside of the housing 62 with one side surface of the housing 62 of the light projecting unit 61 of the optical sensor 50 shown in FIG. 3 removed, and 66 is a lens. The end portion 64a of the lens 66 and the optical fiber 64 is fitted into a recess 65 formed inside the housing 62, and is fixed by being sandwiched by one side surface where a similar recess is formed.
[0019]
The lens 66 is formed to be flat with an incident surface 67 on which light that is propagated through the optical fiber 64 from a light source (not shown) and is emitted from the distal end surface of the end portion 64 a of the optical fiber 64 and an emission surface 68 that is formed into a spherical shape. It is constituted by a transparent flat plate having a reflection surface 69. FIG. 2 is a perspective view of the lens 66 and will be described together with FIG. 1. The incident surface 67 is formed with an elongated concave portion 70 having a spherical bottom surface, that is, a concave lens, and the central portion of the concave portion 70 with respect to the length direction is formed. The opposing side surfaces are formed close to each other, and the opening surface of the concave portion 70 is a wide and narrow opening surface 71 having a bowl shape as shown in FIG.
[0020]
Such a concave portion 70, that is, a concave lens, is formed in order to correct refraction due to the incident angle of the light emitted from the distal end surface of the end portion 64a of the optical fiber 64 with respect to the incident surface 67 and maintain straightness. In addition, the ridge shape of the opening surface 71 is a case where the amount of light emitted from the distal end surface of the optical fiber 64 is large in the central portion, and the narrow portion reaches the amount of light emitted from the end surface of the optical fiber 64, that is, the incident surface 67. The shape can be changed according to the distribution of the amount of light to be emitted.
[0021]
The surface of the incident surface 67 excluding the opening surface 71 is formed as a shielding surface that irregularly reflects or reflects the light emitted from the distal end surface of the optical fiber 64 so as not to enter the inside of the thickness of the lens 66. A reflector 72 is formed on the reflecting surface 69 of the lens 66 by aluminum vapor deposition or the like, and the light incident from the opening surface 71 of the incident surface 67 is reflected by the reflector 72 and propagates to the exit surface 68, and the exit surface. In 68, the light beam is parallel to the optical axis and emitted to the outside, that is, the detection area of the detected object. In this embodiment, the reflecting surface 69 is widely formed, and a reflector 72 is formed on a part of the reflecting surface 69 to form an actual reflecting surface. Therefore, the light reaching the surface other than the reflector 72 is emitted to the outside.
[0022]
In the lens 66 configured in this way, the distribution of the amount of incident light is made uniform in the longitudinal direction of the opening surface 71 according to the shape of the opening surface 71 of the incident surface 67, and the distribution of the emitted light amount is also covered. The detection object is made uniform in the vertical direction of the detection area. In this embodiment, the reflecting surface 69 of the lens 66 is an inclined surface in which the angle α formed between the incident light axis and the outgoing light axis is 76 degrees, and the angle β formed between the reflecting surface 69 and the outgoing light axis is 52 degrees. Has been.
[0023]
In the above embodiment, the incident surface 67 of the lens 66 is formed with shielding means (part excluding the bowl-shaped incident portion (opening surface 71)) having a shape corresponding to the distribution of the amount of light reaching the surface. Such shielding means may be formed on the emission surface 68 or may be formed on the reflection surface 69. In this case, the reflector 72 has a wide and narrow shape corresponding to the distribution of the amount of light that reaches the reflecting surface 69 in the same manner as the ridge shape of the opening surface 71, and the light deviating from the reflector 72 is a surface other than the reflector 72. Is emitted to the outside, and this emission is shielded against light propagating to the exit surface 68 of the lens 66.
[0024]
Further, such shielding means may be formed on the entrance surface or exit surface of the lens of the light receiving unit 81. In this case, it is not necessary to form such shielding means on the lens of the light projecting unit 61. The reflecting surface formed on the lens is not necessarily required, and may be omitted depending on the relationship with the arrangement of the optical fibers.
[0025]
In the above-described embodiment, light that propagates from the light source through the optical fiber 64 and is emitted from the front end surface thereof is used. However, the light source itself composed of a light emitting element or the like is disposed at the end 64 a of the optical fiber 64. Anyway. In this case, the optical fiber 64 is replaced with an electric wire that drives the light source. Similarly, in the light receiving unit 81, an electric cable may be used instead of the optical fiber 84, and the incident parallel light bundle 90 may be condensed and emitted to the light receiving element.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, the distribution of the amount of light emitted from the optical lens is made uniform, and the detection accuracy of the detected object can be easily increased. In addition, much of the amount of light emitted from the end face of the optical fiber can be used, and the detection distance can be increased. Further, since the concave lens, shielding means, and reflecting surface of the optical system are formed on the optical lens, the number of assembly parts of the optical system is small, and the adjustment of the arrangement position of the optical system parts becomes easy.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating a configuration of a light projecting unit of an optical sensor according to an embodiment of the present invention.
FIG. 2 is a perspective view of a lens according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of an optical sensor according to an embodiment of the present invention.
FIG. 4 is a configuration diagram showing an outline of an example of an optical sensor.
[Explanation of symbols]
50 Optical sensor 61 Projection unit 62, 82 Housing 63, 83 Opening 64, 84 Optical fiber 65 Concave portion 66 of housing Optical lens 67 Incident surface 68 Outgoing surface 69 Reflecting surface 70 Concave portion (concave lens)
71 Incident opening 72 Reflector 81 Light receiving part

Claims

The light from the light source is incident from the incident surface, the incident light is converted into a light beam having a predetermined size, and the light beam emitted from the first optical lens is incident on the first optical lens. A second optical lens that is incident from the surface and that converts the incident light into a convergent light and exits from the exit surface, and the light exiting from the second optical lens causes the exit surface of the first optical lens to In an optical sensor configured to detect an object to be detected positioned between an incident surface of the second optical lens, an incident surface and an output surface of the first optical lens, and an incident surface of the second optical lens A shielding body is provided that is opposed to at least one of the light exit surfaces and is formed with a substantially light-transmitting aperture that is narrow in the vicinity of the optical axis and widens as the distance from the optical axis increases. An optical sensor.

2. The optical sensor according to claim 1, wherein the surface of the optical lens facing the shield having the substantially light-transmitting aperture is an incident surface of the first and / or second optical lens.

The light from the light source is incident from the incident surface, the incident light is converted into a light beam having a predetermined size, and the light beam emitted from the first optical lens is incident on the first optical lens. A second optical lens that is incident from the surface and that converts the incident light into a convergent light and exits from the exit surface, and the light exiting from the second optical lens causes the exit surface of the first optical lens to In an optical sensor configured to detect an object to be detected positioned between an incident surface of the second optical lens, an incident surface and an output surface of the first optical lens, and an incident surface of the second optical lens Opposing to at least one of the light exit surfaces, a shield having a light transmission opening having a substantially bowl shape formed to be narrow in the vicinity of the optical axis and widen as the distance from the optical axis is increased. 1 optical lens and second optical lens Optical sensor is characterized by providing a reflective surface for reflecting the emission surface of the light incident from the incident surface on one of the lens or both lenses.

The light from the light source is incident from the incident surface, the incident light is converted into a light beam having a predetermined size, and the light beam emitted from the first optical lens is incident on the first optical lens. A second optical lens that is incident from the surface and that converts the incident light into a convergent light and exits from the exit surface, and the light exiting from the second optical lens causes the exit surface of the first optical lens to In an optical sensor configured to detect an object to be detected positioned between the incident surface of the second optical lens, either one of the first optical lens and the second optical lens or both lenses A reflection surface that reflects light incident from the incident surface to the output surface is provided, and at least one of the reflection surfaces formed on one or both of the first optical lens and the second optical lens. Narrow near the optical axis, Light sensor characterized by comprising a substantially gourd shape formed to be wider as the distance from.

The concave portion for forming a concave lens is formed on the incident surface of the first optical lens and / or the second optical lens, and the concave portion for forming the concave lens is formed . Optical sensor.