JPH0345192Y2 - - Google Patents
Info
- Publication number
- JPH0345192Y2 JPH0345192Y2 JP1985146004U JP14600485U JPH0345192Y2 JP H0345192 Y2 JPH0345192 Y2 JP H0345192Y2 JP 1985146004 U JP1985146004 U JP 1985146004U JP 14600485 U JP14600485 U JP 14600485U JP H0345192 Y2 JPH0345192 Y2 JP H0345192Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- optical system
- optical fiber
- emitting element
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 49
- 238000001514 detection method Methods 0.000 claims description 33
- 239000013307 optical fiber Substances 0.000 claims description 32
- 239000000835 fiber Substances 0.000 claims description 13
- 238000004033 diameter control Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 description 12
- 238000010168 coupling process Methods 0.000 description 12
- 238000005859 coupling reaction Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 3
- 230000008094 contradictory effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Electronic Switches (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【考案の詳細な説明】
〔技術分野〕
本考案は、投光手段から検知エリアに投光され
る光ビームの被検知物体による反射光を受光手段
にて受光し、受光手段出力に基いて検知エリア内
の被検知物体の有無を検知するようにした反射型
光電スイツチに関するものである。[Detailed description of the invention] [Technical field] The present invention uses a light receiving means to receive the reflected light of a light beam projected from a light projecting means onto a detection area by an object to be detected, and detects the light based on the output of the light receiving means. This invention relates to a reflective photoelectric switch that detects the presence or absence of an object to be detected within an area.
従来、この種の反射型光電スイツチとして、投
光手段から検知エリアに投光した光の被検知物体
による反射光を受光手段にて受光し、被検知物体
からの反射光量の大小によつて被検知物体の有無
を判定するようにしたものがあり、このような反
射型光電スイツチにあつては、被検知物体の後方
に高反射率の物体がある場合や被検知物体の反射
率が異なる場合などにおいて測距誤差が生じて誤
動作が発生（検知距離が変化）するという問題が
あつた。そこで、このような誤動作を防止するよ
うにした反射型光電スイツチとして、考案者らが
特願昭58−14163号として出願している三角測量
方式のものがある。すなわち、この反射型光電ス
イツチは第４図および第５図に示すようになつて
おり、被検知物体Ｘに対して光ビームＰを投光す
る投光手段１は、投光タイミングを設定するクロ
ツクパルスを発生する発振回路１０、投光用発光
素子１２を駆動するドライブ回路１１および凸レ
ンズよりなる投光用光学系１３にて形成されてお
り、投光用発光素子１２から発せられる光を投光
用光学手段１３にて光ビームＰに成形して検知エ
リアに投光するようになつている。この投光手段
１から所定距離l0をもつて側方に配設され被検知
物体Ｘによる光ビームＰの反射光Ｒを集光する受
光用光学系２は凸レンズにて形成されている。こ
の受光用光学系２の集光面に配設され集光スポツ
トＳの位置（距離ｌに対応してＭ方向に移動す
る）に対応した位置信号IA，IBを出力する位置検
出手段４は、例えば１次元位置検出素子（PSD）
にて形成されており、この出力信号は相反した信
号となつている。この位置検出手段４出力に基い
て被検知物体Ｘが所定の検知エリア内に存在する
かどうかを判別して出力回路６を制御する判別制
御手段５は、位置検出手段４から出力される位置
信号（相反する電流信号IA，IB）をそれぞれ増幅
して電圧信号VA，VBに変換する受光回路２１ａ，
２１ｂと、受光回路２１ａ，２１ｂ出力を対数増
幅する対数増幅回路２２ａ，２２ｂと、対数増幅
回路２２ａ，２２ｂ出力lnVA，lnVBの差を演算
する減算回路２３と、減算回路２３出力lnVA／
VBと距離設定用ボリユームVRにて設定される基
準電圧Vsとを比較して、減算回路２３出力
lnVA／VBが第７図に示すように基準電圧Vs以下
のとき（被検知物体Ｘが検知エリア内に存在する
とき）に出力が“Ｈ”レベルとなる電圧コンパレ
ータよりなる比較回路２４と、比較回路２４出力
を発振回路１０出力に基いてチエツク（クロツク
パルスに同期してレベルを判定）することにより
誤動作を防止する信号処理回路２５とで形成され
ており、上記信号処理回路２５から物体検知信号
が出力されたとき、出力回路６が駆動されるよう
になつている。なお、第６図ａ，ｂ，ｃは、それ
ぞれ被検知物体Ｘまでの距離がl1，l2，l3である
場合における位置検出手段４上の集光スポツトＳ
の位置をそれぞれ示している。また、上述の１次
元位置検出素子に代えて２個のフオトダイオード
をＭ方向（集光スポツトＳの移動方向）に連設し
たものを位置検出手段４として用いても良いこと
は言うまでもない。
Conventionally, this type of reflective photoelectric switch uses a light receiving means to receive the reflected light of the light projected onto the detection area from the light projecting means and from the detected object, and detects the amount of light reflected from the detected object depending on the magnitude of the reflected light from the detected object. Some reflective photoelectric switches are designed to determine the presence or absence of a sensing object, and in the case of such reflective photoelectric switches, it is difficult to detect when there is an object with a high reflectance behind the sensing object or when the sensing object has a different reflectance. There has been a problem in that distance measurement errors occur, resulting in malfunctions (changes in detection distance). Therefore, as a reflection type photoelectric switch designed to prevent such malfunctions, there is a triangulation type photoelectric switch which the inventors have filed as Japanese Patent Application No. 14163/1983. That is, this reflective photoelectric switch is constructed as shown in FIGS. 4 and 5, and the light projecting means 1 that projects the light beam P onto the object to be detected X uses a clock pulse that sets the light projection timing. It is formed of an oscillation circuit 10 that generates a light emitting element 12, a drive circuit 11 that drives a light emitting element 12 for emitting light, and an optical system 13 for emitting light consisting of a convex lens. The optical means 13 forms the light beam P and projects it onto the detection area. A light-receiving optical system 2, which is disposed laterally at a predetermined distance l0 from the light projecting means 1 and which collects the reflected light R of the light beam P from the object to be detected X, is formed of a convex lens. Position detection means 4 is disposed on the light-converging surface of the light-receiving optical system 2 and outputs position signals I A and I B corresponding to the position of the condensing spot S (moves in the direction M in accordance with the distance l). For example, one-dimensional position sensing device (PSD)
The output signals are contradictory signals. A determination control means 5 that determines whether the detected object X exists within a predetermined detection area based on the output of the position detection means 4 and controls the output circuit 6 receives the position signal output from the position detection means 4. A light receiving circuit 21a that amplifies (contradictory current signals I A and I B ) and converts them into voltage signals V A and V B , respectively;
21b, logarithmic amplifier circuits 22a and 22b that logarithmically amplify the outputs of the light receiving circuits 21a and 21b, a subtraction circuit 23 that calculates the difference between the logarithmic amplifier circuits 22a and 22b outputs lnV A and lnV B , and the subtraction circuit 23 output lnV A /
Compare V B with the reference voltage Vs set by the distance setting volume VR, and output the subtraction circuit 23.
As shown in FIG. 7, a comparator circuit 24 consisting of a voltage comparator whose output becomes "H" level when lnV A /V B is less than the reference voltage Vs (when the detected object X exists within the detection area). , and a signal processing circuit 25 that prevents malfunction by checking the output of the comparison circuit 24 based on the output of the oscillation circuit 10 (determining the level in synchronization with the clock pulse). When the signal is output, the output circuit 6 is driven. Note that FIGS. 6a, b, and c show the condensing spot S on the position detection means 4 when the distances to the detected object X are l 1 , l 2 , and l 3, respectively.
The location of each is shown. It goes without saying that, in place of the one-dimensional position detecting element described above, two photodiodes arranged in series in the M direction (the moving direction of the condensing spot S) may be used as the position detecting means 4.
ところで、従来、このような反射型光電スイツ
チを狭いスペースに配設し易くするために、第８
図および第９図に示すように、光学ブロツクＡと
回路ブロツクＢとを光フアイバー７，８ａ，８ｂ
を使用して光学的に接続したものがあつた。ここ
に、投光用光フアイバー７は投光用光学系１３と
投光用発光素子１３との間を光学的に接続してお
り、受光用光フアイバー８ａ，８ｂは受光用光学
系２と位置検出手段４との間を光学的に接続して
おり、光フアイバー７，８ａ，８ｂの光学ブロツ
ク側の端部はフアイバーホルダー３０にて一体的
に保持されている。第１０図は受光用光フアイバ
ー８ａ，８ｂの受光端面における集光スポツトＳ
の移動状態を示す図（第６図に対応する図）であ
り、第１１図は受光用光フアイバー８ａ，８ｂと
位置検出手段４たる１次元位置検出素子との光結
合例を示しており、両受光用光フアイバー８ａ，
８ｂの結合位置の間隔ｙを変えることにより検知
特性を変化させることができるようになつてい
る。 By the way, conventionally, in order to make it easier to arrange such a reflective photoelectric switch in a narrow space, the eighth
As shown in FIG. 9 and FIG. 9, the optical block A and the circuit block B are
There was one that was optically connected using . Here, the light-emitting optical fiber 7 optically connects the light-emitting optical system 13 and the light-emitting element 13, and the light-receiving optical fibers 8a and 8b are located at the same position as the light-receiving optical system 2. It is optically connected to the detection means 4, and the ends of the optical fibers 7, 8a, 8b on the optical block side are integrally held by a fiber holder 30. Figure 10 shows the light condensing spot S on the light receiving end face of the light receiving optical fibers 8a and 8b.
FIG. 11 shows an example of optical coupling between the light-receiving optical fibers 8a, 8b and the one-dimensional position detection element serving as the position detection means 4, Optical fiber 8a for both light reception,
The detection characteristics can be changed by changing the interval y between the bonding positions of 8b.
なお、２個のフオトダイオードを連設して位置
検出手段４を形成するものにあつては、各フオト
ダイオードを受光用光フアイバー８ａ，８ｂの出
光端面にそれぞれ光結合し、各フオトダイオード
出力を受光回路２１ａ，２１ｂに入力すれば良
い。 In addition, in the case where two photodiodes are arranged in series to form the position detection means 4, each photodiode is optically coupled to the light output end face of the light receiving optical fibers 8a and 8b, and the output of each photodiode is It is sufficient to input it to the light receiving circuits 21a and 21b.
ところで、このように光学ブロツクＡと回路ブ
ロツクＢとを光フアイバー７，８ａ，８ｂを用い
て分離することにより検知ヘツド部を小型化した
従来例にあつては、測距可能距離すなわち検知可
能距離を長くして検知エリアの設定可能範囲を広
くしたい場合あるいは投光手段１から投光される
光ビームＰの径を細くして測距誤差（例えば、Ｍ
方向に移動する被検知物体Ｘが光ビームＰに出入
りする際に発生する測距誤差）を少なくしたい場
合において以下の問題があつた。すなわち、検知
ヘツドたる光学ブロツクＡを小型化するために
投、受光用光学系１３，２として第１２図に示す
ように開口径Ｄの小さい小型の凸レンズを使用す
ることになるが、検出距離ａを長くしたいという
要望を満足させるためには強い光ビームＰを投光
しなければならないので、焦点距離ｆを短くして
投光用光フアイバー７から投光用光学系１３への
結合効率（ｆ／Ｄ）を良くする必要がある。しか
しながら、このように焦点距離ｆを短くすると、
凸レンズから光源位置である投光用光フアイバー
７の出光側の端面までの距離ｂが短くなり、その
結果、像倍率ｍ＝ａ／ｂが大きくなり検知エリア
に投光される光ビームＰの検知距離ａにおけるビ
ーム径（ｍ×ｄ但し、フアイバー径ｄを光源径と
する）が太くなつて検知精度が悪くなるという不
都合があつた。このような不都合を回避するため
には投光用光フアイバー７のフアイバー径ｄを細
くすれば良いことになるが、投光用光フアイバー
７のフアイバー径ｄを細くすると、投光用光フア
イバー７と投光用発光素子１２との光結合部分の
位置ずれに対する許容幅が少なくなつて光結合が
難しくなり、位置ずれによる結合損失が増加して
投光手段１から投光される光ビームＰが弱くなつ
てしまう場合があるという問題があつた。特に、
光結合部分をコネクタ接続にする場合にあつて
は、極めて高い精度の部品を使用する必要があ
り、コストが高くなつてしまうという問題があつ
た。 By the way, in the conventional example in which the detection head section is miniaturized by separating the optical block A and the circuit block B using the optical fibers 7, 8a, and 8b, the measurable distance, that is, the detectable distance If you want to widen the range in which the detection area can be set by increasing
When it is desired to reduce the distance measurement error that occurs when the detected object X moving in the direction enters and exits the light beam P, the following problem occurs. That is, in order to downsize the optical block A serving as the detection head, a small convex lens with a small aperture diameter D is used as the light emitting and receiving optical systems 13 and 2, as shown in FIG. 12, but the detection distance a In order to satisfy the desire to lengthen the beam, it is necessary to project a strong light beam P. Therefore, the focal length f must be shortened to increase the coupling efficiency (f) from the projection optical fiber 7 to the projection optical system 13. /D) needs to be improved. However, if the focal length f is shortened in this way,
The distance b from the convex lens to the light output side end face of the light projection optical fiber 7, which is the light source position, becomes shorter, and as a result, the image magnification m=a/b becomes larger and the light beam P projected onto the detection area is detected. There was an inconvenience that the beam diameter (m×d, where the fiber diameter d is the light source diameter) at the distance a became thicker and the detection accuracy deteriorated. In order to avoid such inconvenience, it is sufficient to make the fiber diameter d of the light emitting optical fiber 7 thinner. However, if the fiber diameter d of the light emitting optical fiber 7 is made thinner, The allowable width for the positional deviation of the optical coupling part between the light emitting element 12 and the light emitting element 12 decreases, making optical coupling difficult, and the coupling loss due to positional deviation increases, causing the light beam P projected from the light projecting means 1 to There was a problem that it could become weak. especially,
When the optical coupling portion is connected to a connector, it is necessary to use extremely high-precision components, resulting in an increase in cost.
本考案は上記の点に鑑みて為されたものであ
り、その目的とするところは、小型の光学ブロツ
クにてビーム径が細く且つ強い光ビームを比較的
遠い検知エリアに投光することができ、しかも投
光用光フアイバーと投光用発光素子との光結合が
容易にできる反射型光電スイツチを提供すること
にある。
The present invention was developed in view of the above points, and its purpose is to use a small optical block to project a strong light beam with a narrow beam diameter to a relatively distant detection area. Moreover, it is an object of the present invention to provide a reflective photoelectric switch that allows easy optical coupling between a light-emitting optical fiber and a light-emitting element.
（実施例）
第１図は本考案一実施例を示すもので、第８図
従来例と同様の反射型光電スイツチにおいて、一
端面が投光用発光素子１２に光結合され、他端面
が投光用光学系１３の光源位置に配置される投光
用光フアイバー７を太径の光フアイバーにて形成
し、上記投光用光フアイバー７の他端面に出光範
囲を制限する光源径制御用アパーチヤ９を設けた
ものである。ここに、実施例にあつては、投、受
光用光フアイバー７，８ａ，８ｂは、フアイバー
ホルダー３０に穿設された保持孔３５，３６に挿
入されて所定間隔で保持されるようになつてお
り、保持孔３５の前面開口部にはアパーチヤ９が
一体的に形成されている。また、小型の凸レンズ
よりなる投、受光用光学系１３，２は、光学ブロ
ツクケース３１を構成するケース本体３１ａの前
面に形成された投、受光用開口部３２ａ，３２ｂ
に取着されており、フアイバーホルダー３０をケ
ース本体３１ａの所定位置に嵌合してケースカバ
ー３１ｂを覆着することにより光学ブロツクＡが
形成されている。なお、投、受光用開口部３２
ａ，３２ｂにはレンズ保護を兼ねるフイルター３
３ａ，３３ｂが取着されており、受光用光学系２
と受光用光フアイバー８ａ，８ｂの受光面との間
の光路の側方には、光電スイツチの直近の不感領
域をなくすためのＶ字状反射板３４が配設されて
いる。
(Embodiment) Fig. 1 shows an embodiment of the present invention, and Fig. 8 shows a reflective photoelectric switch similar to the conventional example, in which one end face is optically coupled to a light emitting element 12 for projecting light, and the other end face is optically coupled to a light emitting element 12 for projecting light. The light projecting optical fiber 7 disposed at the light source position of the light optical system 13 is formed of a large diameter optical fiber, and the light source diameter control aperture for limiting the light output range is provided on the other end surface of the light projecting optical fiber 7. 9. In this embodiment, the optical fibers 7, 8a, 8b for emitting and receiving light are inserted into holding holes 35, 36 formed in the fiber holder 30 and held at predetermined intervals. An aperture 9 is integrally formed in the front opening of the holding hole 35. Further, the optical systems 13 and 2 for projection and light reception, which are made up of small convex lenses, are formed in the front surface of the case body 31a constituting the optical block case 31, through openings 32a and 32b for projection and light reception.
The optical block A is formed by fitting the fiber holder 30 into a predetermined position of the case body 31a and covering it with the case cover 31b. Note that the light emitting and light receiving opening 32
A and 32b have filters 3 that also serve as lens protection.
3a and 33b are attached, and the light receiving optical system 2
A V-shaped reflecting plate 34 is disposed on the side of the optical path between the photodetector and the light-receiving surfaces of the light-receiving optical fibers 8a and 8b in order to eliminate a dead area immediately adjacent to the photoelectric switch.
いま、実施例にあつては、投光用発光素子１２
と投光用光フアイバー７との光結合を容易にする
ためにフアイバー径ｄを太くした場合にあつて
も、第３図に示すように光源径を出光側の端面に
配設されたアパーチヤ９の開口径d′に応じた小さ
な径にすることができるので、小型の光学ブロツ
クＡにてビーム径が細く且つ強い光ビームＰを比
較的遠い検知エリアに投光することができ、しか
も投光用光フアイバー７と投光用発光素子１２と
の光結合部分の位置ずれの許容範囲が大きくなつ
て光結合が容易にできるようになつている。ま
た、光結合部分をコネクタ接続にする場合にあつ
ても、あまり高い精度の部品を使用する必要がな
く、コストが高くなることがない。 Now, in the embodiment, the light emitting element 12 for projecting light
Even when the diameter d of the fiber is increased to facilitate optical coupling between the light source and the light emitting optical fiber 7, the diameter of the light source can be adjusted by changing the diameter of the light source to the aperture 9 disposed on the end face on the light output side, as shown in FIG. Since the diameter can be made small according to the aperture diameter d' of the optical block A, it is possible to project a strong light beam P with a narrow beam diameter to a relatively distant detection area using a small optical block A. The permissible range of positional deviation of the optical coupling portion between the optical fiber 7 and the light emitting element 12 for projecting light is increased, so that optical coupling can be easily performed. Furthermore, even when the optical coupling portion is connected to a connector, it is not necessary to use parts with very high precision, and the cost does not increase.
本考案は上述のように、投光用発光素子から発
する光を投光用光学系にて光ビームに成形して検
知エリアに投光する投光手段と、投光手段の側方
に所定距離をもつて配設され被検知物体による光
ビームの反射光を集光する受光用光学系と、受光
用光学系の集光面に配設され被検知物体までの距
離に応じて集光面内で移動する集光スポツトの位
置に対応した位置信号を出力する位置検出手段
と、位置検出手段出力に基いて被検知物体が所定
の検知エリア内に存在するかどうかを判別して出
力回路を制御する判別制御手段とを具備し、投光
用光学系および受光用光学系よりなる光学ブロツ
クと投光用発光素子および位置検出手段を含む回
路ブロツクとの間を光フアイバーにて光学的に接
続して成る反射型光電スイツチにおいて、一端面
が投光用発光素子に光結合され、他端面が投光用
光学系の光源位置に配置される投光用光フアイバ
ーを投光用発光素子の光源径と同等な太径の光フ
アイバーにて形成し、上記投光用光フアイバーの
他端面に出光範囲を制限する光源径制御用アパー
チヤを設けたものであり、投光用発光素子と投光
用光フアイバーとの光結合を容易にするためにフ
アイバー径を太くした場合にあつても、アパーチ
ヤによつて光源径を小さくすることができるの
で、小型の光学ブロツクにてビーム径が細く且つ
強い光ビームを比較的遠い検知エリアに投光する
ことができ、しかも投光用光フアイバーと投光用
発光素子との光結合が容易にできるという効果が
ある。また、光源径制御用アパーチヤを、フアイ
バーホルダーの保持孔の前面開口に一体的に設け
たので、構成が簡略化されるとともに、組み立て
が容易になり、コストを安くすることができると
いう効果がある。
As described above, the present invention includes a light projecting means that shapes the light emitted from the light emitting element into a light beam using a light projecting optical system and projects the light onto a detection area, and a light-receiving optical system that is arranged with a light-receiving optical system to collect the reflected light of the light beam from the object to be detected; a position detection means that outputs a position signal corresponding to the position of a light condensing spot that moves with the sensor; and a position detection means that determines whether a detected object exists within a predetermined detection area based on the output of the position detection means and controls an output circuit. The optical block comprising the light emitting optical system and the light receiving optical system and the circuit block including the light emitting element for light emitting and the position detecting means are optically connected by an optical fiber. In a reflective photoelectric switch, a light emitting optical fiber is connected to a light emitting optical fiber whose one end face is optically coupled to a light emitting element for emitting light and the other end face is arranged at the light source position of the light emitting optical system. It is formed of an optical fiber with a diameter equivalent to that of the above, and has an aperture for controlling the light source diameter to limit the light output range on the other end surface of the above-mentioned light emitting optical fiber, and the light emitting element for light emitting and the light emitting light Even when the fiber diameter is made thicker to facilitate optical coupling with the fiber, the light source diameter can be made smaller by the aperture, so a small optical block can produce a small beam diameter and a strong light beam. It is possible to project light to a relatively distant detection area, and the optical fiber for light projection and the light emitting element for light projection can be optically coupled easily. In addition, since the aperture for controlling the light source diameter is integrally provided in the front opening of the holding hole of the fiber holder, the configuration is simplified, assembly is easy, and costs can be reduced. .
第１図は本考案一実施例の要部分解斜視図、第
２図ａは同上の要部正面図、第２図ｂは同上の要
部断面図、第３図は同上の動作説明図、第４図は
本考案に係る反射型光電スイツチの基本例の要部
概略構成図、第５図は同上のブロツク回路図、第
６図および第７図は同上の動作説明図、第８図は
従来例の概略構成図、第９図ａは同上の要部正面
図、第９図ｂは同上の要部断面図、第１０図乃至
第１２図は同上の動作説明図である。
１は投光手段、２は受光用光学系、４は位置検
出手段、５は判別制御手段、６は出力回路、７，
８ａ，８ｂは光フアイバー、９はアパーチヤ、１
２は投光用発光素子、１３は投光用光学系、３０
はフアイバーホルダー、３５は保持孔である。
Fig. 1 is an exploded perspective view of the main parts of an embodiment of the present invention, Fig. 2a is a front view of the main parts of the same, Fig. 2b is a sectional view of the main parts of the same, Fig. 3 is an explanatory diagram of the operation of the same, Fig. 4 is a schematic diagram of the essential parts of a basic example of a reflective photoelectric switch according to the present invention, Fig. 5 is a block circuit diagram of the same as the above, Figs. A schematic configuration diagram of the conventional example, FIG. 9a is a front view of the main part of the same, FIG. 9b is a sectional view of the main part of the same, and FIGS. 10 to 12 are operation explanatory diagrams of the same. 1 is a light projecting means, 2 is a light receiving optical system, 4 is a position detection means, 5 is a discrimination control means, 6 is an output circuit, 7,
8a and 8b are optical fibers, 9 is an aperture, 1
2 is a light emitting element for projecting light; 13 is an optical system for projecting light; 30
is a fiber holder, and 35 is a holding hole.
Claims (1)
て光ビームに成形して検知エリアに投光する投光
手段と、投光手段の側方に所定距離をもつて配設
され被検知物体による光ビームの反射光を集光す
る受光用光学系と、受光用光学系の集光面に配設
され被検知物体までの距離に応じて集光面内で移
動する集光スポツトの位置に対応した位置信号を
出力する位置検出手段と、位置検出手段出力に基
いて被検知物体が所定の検知エリア内に存在する
かどうかを判別して出力回路を制御する判別制御
手段とを具備し、投光用光学系および受光用光学
系よりなる光学ブロツクと投光用発光素子および
位置検出手段を含む回路ブロツクとの間を光フア
イバーにて光学的に接続して成る反射型光電スイ
ツチにおいて、一端面が投光用発光素子に光結合
され、他端面が投光用光学系の光源位置に配置さ
れる投光用光フアイバーを投光用発光素子の光源
径と同等な太径の光フアイバーにて形成するとと
もに、投光用光フアイバーの端部を投光用光学系
に対して定位置に配置したフアイバーホルダーに
設けた保持孔に貫通させた形で固定し、上記投光
用光フアイバーの他端面からの出光範囲を制限す
る光源径制御用アパーチヤをフアイバーホルダー
の保持孔の前面開口に一体的に設けたことを特徴
とする反射型光電スイツチ。 A light projecting means that forms the light emitted from the light emitting element into a light beam by a light projecting optical system and projects it onto a detection area; A light-receiving optical system that collects the reflected light of the light beam from an object, and a light-collecting spot that is disposed on the light-collecting surface of the light-receiving optical system and moves within the light-collecting surface according to the distance to the object to be detected. and a determination control means that determines whether a detected object exists within a predetermined detection area based on the output of the position detection means and controls an output circuit. , a reflective photoelectric switch in which an optical block consisting of a light emitting optical system and a light receiving optical system is optically connected to a circuit block including a light emitting element for light emitting and a position detecting means using an optical fiber, An optical fiber for light projection whose one end face is optically coupled to the light emitting element for light projection and the other end face is placed at the light source position of the light emitting optical system is an optical fiber with a large diameter equivalent to the light source diameter of the light emitting element for light projection. At the same time, the end of the light emitting optical fiber is fixed by passing through a holding hole provided in a fiber holder placed at a fixed position relative to the light emitting optical system, and the above light emitting optical fiber is fixed. A reflective photoelectric switch characterized in that a light source diameter control aperture that limits the range of light emitted from the other end face is integrally provided in the front opening of the holding hole of the fiber holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985146004U JPH0345192Y2 (en) | 1985-09-25 | 1985-09-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985146004U JPH0345192Y2 (en) | 1985-09-25 | 1985-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6253375U JPS6253375U (en) | 1987-04-02 |
| JPH0345192Y2 true JPH0345192Y2 (en) | 1991-09-24 |
Family
ID=31058063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985146004U Expired JPH0345192Y2 (en) | 1985-09-25 | 1985-09-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0345192Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114972A (en) * | 1979-02-28 | 1980-09-04 | Sankusu:Kk | Reflective photoelectric switch |
| JPS5714942B2 (en) * | 1978-09-26 | 1982-03-27 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013143Y2 (en) * | 1980-06-20 | 1985-04-26 | 北陽電機株式会社 | Fiber optic photoelectric switch |
| JPS59170285U (en) * | 1983-04-28 | 1984-11-14 | 株式会社 徳田製作所 | Object detection device using reflective photo sensor |
-
1985
- 1985-09-25 JP JP1985146004U patent/JPH0345192Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5714942B2 (en) * | 1978-09-26 | 1982-03-27 | ||
| JPS55114972A (en) * | 1979-02-28 | 1980-09-04 | Sankusu:Kk | Reflective photoelectric switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6253375U (en) | 1987-04-02 |
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