JPH0418185Y2 - - Google Patents
Info
- Publication number
- JPH0418185Y2 JPH0418185Y2 JP1986050166U JP5016686U JPH0418185Y2 JP H0418185 Y2 JPH0418185 Y2 JP H0418185Y2 JP 1986050166 U JP1986050166 U JP 1986050166U JP 5016686 U JP5016686 U JP 5016686U JP H0418185 Y2 JPH0418185 Y2 JP H0418185Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarizing
- polarizing filter
- receiving
- filters
- 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
- 230000010287 polarization Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Switches Operated By Changes In Physical Conditions (AREA)
- Electronic Switches (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、被検出体を光学的に検出する回帰反
射形光電スイツチに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a retroreflective photoelectric switch that optically detects an object to be detected.
［従来技術］
従来、この種の回帰反射形光電スイツチとして
は、投光素子からの投光用偏光フイルタを介した
投光が回帰ミラーにより反射されたときに、この
反射光たる検出光を受光用偏光フイルタを介して
受光素子に受光するものが供されている。このも
のにおいては、各偏光フイルタが夫々の偏光方向
を直交させた状態で配置されると共に、回帰ミラ
ーによる偏光角（投光と検出光との間の偏光角）
が90°となるように設定している。これにより、
被検出体或は背景が反射性表面を有する場合（例
えば鏡面体等）において、該反射性表面により反
射された反射光が前記受光用偏光フイルタを透過
しないことから、該反射光を回帰ミラーにより反
射された検出光として誤つて検出することがなく
なる。[Prior Art] Conventionally, this type of retroreflective photoelectric switch receives detection light that is reflected light when light emitted from a light emitting element passes through a polarizing filter for light emitting and is reflected by a return mirror. A light receiving element is provided that receives light through a polarizing filter. In this device, each polarizing filter is arranged with the respective polarization directions perpendicular to each other, and the polarization angle (polarization angle between the projected light and the detected light) by the return mirror is
is set so that it is 90°. This results in
When the object to be detected or the background has a reflective surface (for example, a mirror surface, etc.), the reflected light reflected by the reflective surface does not pass through the light-receiving polarizing filter. This eliminates the possibility of erroneously detecting reflected detection light.
このような回帰反射形光電スイツチの一例とし
て第６図に示すものが供されている。この第６図
において、ａは受光素子、ｂは投光素子で、これ
らはケースｃ内に夫々上下に配設されている。
ｄ，ｅは受光用及び投光用偏光フイルタで、これ
らは受光素子ａ及び投光素子ｂの各前方に夫々受
光レンズｆ及び投光レンズｇを介して設けられて
いる。ｈは受光素子ａと投光素子ｂとの間に設け
られた断面略Ｙ字状の遮光板で、この遮光板ｈに
より受光部ｉと投光部ｊとが光学的に完全に分離
されるようになつている。これによつて、被検出
体ｋの反射性表面により反射された反射光ｌが受
光部ｉに侵入して誤検出が生じることを防止して
いる。しかしながら、このような構成では、第６
図に示すように、受光用偏光フイルタｄ及び投光
用偏光フイルタｅをそれぞれ受光レンズｆ及び投
光レンズｇの前面に取り付ける場合、両偏光フイ
ルタｄ及びｅの偏光面のなす角度を正確に設定す
る必要があるが、別体の偏光フイルタｄ及びｅを
それぞれケースｃの前面部の開口部に嵌め込んで
受光レンズｆ及び投光レンズｇの前面に取り付け
るだけであるので、両偏光フイルタｄ及びｅの偏
光面のなす角度を正確に設定することが困難であ
る。このため、両偏光フイルタｄ及びｅの偏光面
の角度の設定が不正確になり組立精度が悪くなる
という問題点が発生する。また、偏光フイルタｄ
及びｅを取り付ける際、両フイルタｄ及びｅが別
体であるので、偏光面の取り付け方向を間違える
おそれもある。更に、光電スイツチの組立時にお
いては、部品点数及び組立て工数が多くなると共
に、構造が複雑になるので、製造コストが高くな
る問題点があつた。 An example of such a retroreflective photoelectric switch is shown in FIG. 6. In FIG. 6, a is a light-receiving element, b is a light-emitting element, and these are arranged one above the other in the case c.
Denoted at d and e are polarizing filters for light reception and light projection, which are provided in front of the light receiving element a and the light projecting element b, respectively, via the light receiving lens f and the light projecting lens g. h is a light-shielding plate with a substantially Y-shaped cross section provided between the light-receiving element a and the light-emitting element b, and the light-receiving part i and the light-emitting part j are optically completely separated by this light-shielding plate h. It's becoming like that. This prevents the reflected light l reflected by the reflective surface of the object to be detected k from entering the light receiving section i and causing false detection. However, in such a configuration, the sixth
As shown in the figure, when attaching polarizing filter d for receiving light and polarizing filter e for emitting light to the front of receiving lens f and emitting lens g, respectively, set the angle formed by the polarization planes of both polarizing filters d and e accurately. However, since the separate polarizing filters d and e are simply fitted into the front openings of the case c and attached to the front surfaces of the light-receiving lens f and the light-emitting lens g, both polarizing filters d and It is difficult to accurately set the angle formed by the polarization plane of e. This causes a problem in that the angles of the polarization planes of both polarization filters d and e are inaccurately set, resulting in poor assembly accuracy. In addition, polarizing filter d
When attaching filters d and e, since both filters d and e are separate, there is a risk of attaching the polarizing planes in the wrong direction. Furthermore, when assembling the photoelectric switch, there is a problem that the number of parts and the number of assembly steps increase, and the structure becomes complicated, resulting in an increase in manufacturing costs.
［考案の目的］
本考案は上記の点に鑑みてなされたもので、そ
の目的は、誤検出を確実に防止でき、しかも両偏
光フイルタの偏光面のなす角度を正確に設定する
ことが可能であると共に、その設定作業を容易に
行うことができ、従つて組立精度を向上させるこ
とができ、また、部品点数及び組立て工数を減少
させ得ると共に構造を簡単化させることもでき
て、製造コストを低減し得る回帰反射形光電スイ
ツチを提供するにある。[Purpose of the invention] The present invention was made in view of the above points, and its purpose is to reliably prevent false detection and also to accurately set the angle formed by the polarization planes of both polarizing filters. At the same time, the setting work can be easily performed, and therefore assembly accuracy can be improved, and the number of parts and assembly man-hours can be reduced, as well as the structure can be simplified, and manufacturing costs can be reduced. The object of the present invention is to provide a retroreflective photoelectric switch that can reduce the
［考案の要約］
本考案は、不透明帯域を有する透明ベース板
に、投光用偏光フイルタ及び受光用偏光フイルタ
を互に隣接するように取り付け、更に、両偏光フ
イルタの隣接部分を不透明帯域に位置させること
により構成した偏光ユニツトを備えたところに特
徴を有し、これによつて被検出体或は背景からの
反射光が両偏光フイルタの隣接部分の隙間から侵
入することを防止すると共に、両偏光フイルタを
１つの部品として取扱い得るように構成したもの
である。[Summary of the invention] The present invention includes attaching a polarizing filter for light emission and a polarizing filter for receiving light so as to be adjacent to each other on a transparent base plate having an opaque zone, and further positions adjacent portions of both polarizing filters in the opaque zone. It is characterized by the fact that it is equipped with a polarization unit configured by making the polarization filter 2. This prevents reflected light from the object to be detected or the background from entering through the gap between the adjacent parts of both polarization filters, and The polarizing filter is constructed so that it can be handled as one component.
［実施例］
以下本考案の第１の実施例につき第１図乃至第
４図を参照して説明する。[Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
第２図において、１は全体として矩形状をなす
ケースで、これの内部には受光素子２及び投光素
子３が夫々上下に配設されている。４はケース１
の前面に受光素子２及び投光素子３の前方に位置
して設けられたレンズで、これは、ケース１内に
取付けられたレンズ支持枠５並びにケース１の前
面開口部１ａ内に収容されたレンズ押え部材６に
より固定されており、受光素子２に対応した受光
レンズ４ａ及び投光素子３に対応した投光レンズ
部４ｂを一体化して構成されている。７はレンズ
４の前面に取付けられた偏光ユニツトである。例
えば偏光板で、これは、第３図に示すように矩形
薄板状に形成されており、パツキング８を介する
ことにより密封構造になつている。ここで、偏光
板７についてその中央部分の拡大断面を示す第１
図に従つて述べる。９は透明合成樹脂製の透明ベ
ース板で、これの中央部分には水平方向に不透明
帯域９ａが印刷により形成されている。１０は受
光用偏光フイルタ、１１は投光用偏光フイルタで
あり、これらは、透明ベース板９の表面に互に隣
接した状態で例えば接着剤１２を介して貼り付け
られ、その隣接部分が不透明帯域９ａ内に位置さ
れるように構成されており、夫々の偏光面が例え
ば直交するように、即ち第３図矢印Ａ，Ｂで示す
ように受光用偏光フイルタ１０が縦偏光のみを透
過させ且つ投光用偏光フイルタ１１が横偏光のみ
を透過させるようになつている。 In FIG. 2, a case 1 has a rectangular shape as a whole, and a light receiving element 2 and a light emitting element 3 are arranged above and below, respectively. 4 is case 1
A lens provided in front of the light-receiving element 2 and light-emitting element 3, which is housed in the lens support frame 5 attached to the case 1 and the front opening 1a of the case 1. It is fixed by a lens holding member 6, and is configured by integrating a light receiving lens 4a corresponding to the light receiving element 2 and a light projecting lens part 4b corresponding to the light projecting element 3. 7 is a polarizing unit attached to the front surface of the lens 4. For example, a polarizing plate is formed in the shape of a rectangular thin plate as shown in FIG. 3, and has a sealed structure through packing 8. Here, a first section showing an enlarged cross-section of the central part of the polarizing plate 7 is shown.
Explain according to the diagram. Reference numeral 9 denotes a transparent base plate made of transparent synthetic resin, on which an opaque zone 9a is formed in the horizontal direction by printing at the center thereof. 10 is a polarizing filter for receiving light, and 11 is a polarizing filter for projecting light. These are attached to the surface of the transparent base plate 9 adjacent to each other, for example, via an adhesive 12, and the adjacent portion is an opaque band. 9a, and the light receiving polarizing filter 10 transmits only vertically polarized light and transmits only vertically polarized light so that the respective polarization planes are perpendicular to each other, that is, as shown by arrows A and B in FIG. The light polarizing filter 11 is designed to transmit only horizontally polarized light.
次に上記構成の作用を説明する。まず、第１図
及び第４図において、投光素子３からの投光は偏
光板７の投光用フイルタ１１を介することにより
横偏光Ｃとなる。この横偏光Ｃが回帰ミラー１３
により偏光反射されると、その反射光は縦偏光Ｄ
となり、この縦偏光Ｄが偏光板７の受光用偏光フ
イルタ１０を透過して受光素子２に受光される。
このような状態で、被検出体１４が投光たる横偏
光Ｃを遮ぎると回帰ミラー１３により反射された
縦偏光Ｄが受光素子２に受光されなくなり、以
て、被検出体１４の有無が検出される。 Next, the operation of the above configuration will be explained. First, in FIGS. 1 and 4, the light projected from the light projecting element 3 becomes horizontally polarized light C by passing through the light projecting filter 11 of the polarizing plate 7. This horizontally polarized light C is reflected by the return mirror 13
When polarized light is reflected by D, the reflected light becomes vertically polarized light D
This vertically polarized light D passes through the light receiving polarizing filter 10 of the polarizing plate 7 and is received by the light receiving element 2.
In this state, when the detected object 14 blocks the projected horizontally polarized light C, the vertically polarized light D reflected by the return mirror 13 is no longer received by the light receiving element 2, and thus the presence or absence of the detected object 14 is detected. be done.
次に、被検出体１４が反射性表面を有する場合
には、第２図に示すように、投光たる横偏光Ｃが
反射性表面で反射して反射光Ｅが偏光板７の受光
用偏光フイルタ１０に照射される。このとき反射
光Ｅに含まれる縦偏光Ｄの割合いが回帰ミラー１
３からの反射光に比べて少ないので、反射光Ｅの
ほとんどが受光用偏光フイルタ１０によつて遮光
されるから、誤検出が防止される。さて、上記被
検出体１４からの反射光Ｅが受光用偏光フイルタ
１０と投光用偏光フイルタ１１とが隣接する部分
の隙間に侵入する場合には、該隣接部分が透明ベ
ース板９の不透明帯域９ａに位置するように構成
されているので、反射光Ｅは不透明帯域９ａによ
つて遮光されて受光素子２に受光されることはな
い。この結果、受光用偏光フイルタ１０と投光用
偏光フイルタ１１とが隣接する部分に隙間が生じ
ているときにも、誤検出が防止される。 Next, when the object to be detected 14 has a reflective surface, as shown in FIG. The filter 10 is irradiated with light. At this time, the proportion of the longitudinally polarized light D included in the reflected light E is the regression mirror 1.
3, most of the reflected light E is blocked by the light-receiving polarizing filter 10, thereby preventing false detection. Now, when the reflected light E from the object to be detected 14 enters the gap between the adjacent portion of the light receiving polarizing filter 10 and the light emitting polarizing filter 11, the adjacent portion is an opaque zone of the transparent base plate 9. 9a, the reflected light E is blocked by the opaque zone 9a and is not received by the light receiving element 2. As a result, erroneous detection is prevented even when there is a gap between the adjacent portions of the polarizing filter 10 for light reception and the polarizing filter 11 for light projection.
このような構成の本実施例によれば、偏光板７
を構成するとき、即ち、投光用偏光フイルタ１１
及び受光用偏光フイルタ１０を透明ベース板９に
取り付けるときに、両偏光フイルタ１０，１１の
偏光面のなす角度を正確に設定することが可能で
あると共に、その設定作業を容易に行うことがど
きる。従つて、組立精度を向上させることができ
る。また、光電スイツチの組立時においては、１
個の偏光板７を取り付けるだけであるので、部品
点数を少なくできて、組立工数も減少できる。特
に、この組立時には、両偏光フイルタ１０，１１
の偏光面の角度を設定した後の偏光板７を組み付
けるだけであるので、偏光面の取り付け方向を間
違えるおそれを確実に防止できる。更に、両偏光
フイルタ１０，１１を１つの部品として取扱い得
て構造を簡単化し得、以て構造コストを低減でき
る。 According to this embodiment having such a configuration, the polarizing plate 7
That is, when configuring the polarizing filter 11 for light projection
When attaching the light-receiving polarizing filter 10 to the transparent base plate 9, it is possible to accurately set the angle formed by the polarization planes of both polarizing filters 10 and 11, and the setting work can be easily performed. Ru. Therefore, assembly precision can be improved. Also, when assembling the photoelectric switch, 1
Since only one polarizing plate 7 is attached, the number of parts can be reduced, and the number of assembly steps can also be reduced. In particular, during this assembly, both polarizing filters 10 and 11
Since it is only necessary to assemble the polarizing plate 7 after setting the angle of the polarizing plane, it is possible to reliably prevent the possibility of attaching the polarizing plane in the wrong direction. Furthermore, both polarizing filters 10 and 11 can be handled as one component, simplifying the structure, and thereby reducing structural costs.
尚、上記実施例では、透明ベース板９に不透明
帯域９ａを印刷によつて形成したが、代わりに２
色成形によつて形成したり、不透明部材（例えば
テープ等）を貼り付けるようにしてもよい。 In the above embodiment, the opaque zone 9a was formed on the transparent base plate 9 by printing, but instead, the opaque zone 9a was formed by printing.
It may be formed by color molding or by pasting an opaque member (for example, tape).
第５図は本考案の第２の実施例を示すもので、
第１の実施例と異なるところは、不透明帯域９ａ
の代わりに透明ベース板９の反対側の面に不透明
帯域９ｂを形成するように構成した点にある。こ
の第２の実施例においても、第１の実施例と同様
な作用効果を得ることができる。 FIG. 5 shows a second embodiment of the present invention.
The difference from the first embodiment is that the opaque zone 9a
Instead, an opaque zone 9b is formed on the opposite surface of the transparent base plate 9. In this second embodiment as well, the same effects as in the first embodiment can be obtained.
［考案の効果］
本考案は以上の説明から明らかなように、不透
明帯域を有する透明ベース板に、投光用偏光フイ
ルタ及び受光用偏光フイルタを互に隣接するよう
に取り付け、両偏光フイルタの隣接部分を不透明
帯域に位置させることにより構成した偏光ユニツ
トを備えたので、誤検出を確実に防止でき、しか
も両偏光フイルタの偏光面のなす角度を正確に設
定することが可能であると共に、その設定作業を
容易に行うことができ、従つて組立精度を向上さ
せることができ、また、部品点数及び組立て工数
を減少させ得ると共に構造を簡単化させることも
できて、製造コストを低減し得るという優れた効
果を奏する。[Effects of the invention] As is clear from the above description, the present invention has a transparent base plate having an opaque zone, in which a polarizing filter for light emission and a polarizing filter for light reception are attached adjacent to each other, Equipped with a polarization unit configured by locating a portion in an opaque band, it is possible to reliably prevent false detection, and it is also possible to accurately set the angle formed by the polarization planes of both polarization filters, as well as to adjust the setting. It has the advantage of being easy to work with, improving assembly accuracy, reducing the number of parts and assembly man-hours, and simplifying the structure, reducing manufacturing costs. It has a great effect.
第１図乃至第４図は本考案の第１の実施例を示
すもので、第１図は要部の拡大縦断側面図、第２
図は一部破断した側面図、第３図は要部の正面
図、第４図は一部破断して示す作用説明用の側面
図であり、第５図は本考案の第２の実施例を示す
第１図相当図である。また、第６図は従来構成を
示す第２図相当図である。
図面中、２は受光素子、３は投光素子、７は偏
光板（偏光ユニツト）、９は透明ベース板、９ａ，
９ｂは不透明帯域、１０は受光用偏光フイルタ、
１１は投光用偏光フイルタ、１３は回帰ミラー、
１４は被検出体を示す。
1 to 4 show a first embodiment of the present invention, in which FIG. 1 is an enlarged longitudinal sectional side view of the main part, and FIG.
The figure is a partially cutaway side view, Figure 3 is a front view of the main parts, Figure 4 is a partially cutaway side view for explaining the operation, and Figure 5 is a second embodiment of the present invention. FIG. 1 is a diagram corresponding to FIG. Further, FIG. 6 is a diagram corresponding to FIG. 2 showing a conventional configuration. In the drawing, 2 is a light receiving element, 3 is a light emitting element, 7 is a polarizing plate (polarizing unit), 9 is a transparent base plate, 9a,
9b is an opaque band; 10 is a polarizing filter for light reception;
11 is a polarizing filter for light projection, 13 is a return mirror,
14 indicates an object to be detected.
Claims (1)
と、この投光素子の投光を回帰ミラーにより反射
させた検出光を受光用偏光フイルタを介して受光
する受光素子とを設けてなる回帰反射形光電スイ
ツチにおいて、不透明帯域を有する透明ベース板
に前記投光用偏光フイルタ及び受光用偏光フイル
タを互に隣接するように取り付けると共に、前記
両偏光フイルタの隣接部分を前記不透明帯域に位
置させることにより構成した偏光ユニツトを備え
たことを特徴とする回帰反射形光電スイツチ。 A regression device comprising a light emitting element that emits light through a polarizing filter for projecting light, and a light receiving element that receives detection light obtained by reflecting the light emitted from the light emitting element by a regressing mirror through a polarizing filter for receiving light. In the reflective photoelectric switch, the light emitting polarizing filter and the light receiving polarizing filter are attached to a transparent base plate having an opaque zone so as to be adjacent to each other, and adjacent portions of both the polarizing filters are located in the opaque zone. A retroreflective photoelectric switch characterized by having a polarization unit configured by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986050166U JPH0418185Y2 (en) | 1986-04-03 | 1986-04-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986050166U JPH0418185Y2 (en) | 1986-04-03 | 1986-04-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62161734U JPS62161734U (en) | 1987-10-14 |
| JPH0418185Y2 true JPH0418185Y2 (en) | 1992-04-23 |
Family
ID=30873270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986050166U Expired JPH0418185Y2 (en) | 1986-04-03 | 1986-04-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0418185Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH082900Y2 (en) * | 1987-11-30 | 1996-01-29 | オムロン株式会社 | Reflector for reflective photoelectric sensor |
| JPH0521803Y2 (en) * | 1988-03-25 | 1993-06-04 | ||
| JPH05221546A (en) * | 1992-02-12 | 1993-08-31 | Mita Ind Co Ltd | Paper feeding device |
| JP6584201B2 (en) * | 2015-08-05 | 2019-10-02 | アズビル株式会社 | Retro-reflective photoelectric sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5544527B2 (en) * | 1977-05-21 | 1980-11-12 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5544527U (en) * | 1978-09-16 | 1980-03-24 |
-
1986
- 1986-04-03 JP JP1986050166U patent/JPH0418185Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5544527B2 (en) * | 1977-05-21 | 1980-11-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62161734U (en) | 1987-10-14 |
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