JPH0116361B2 - - Google Patents
Info
- Publication number
- JPH0116361B2 JPH0116361B2 JP865282A JP865282A JPH0116361B2 JP H0116361 B2 JPH0116361 B2 JP H0116361B2 JP 865282 A JP865282 A JP 865282A JP 865282 A JP865282 A JP 865282A JP H0116361 B2 JPH0116361 B2 JP H0116361B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- straight line
- light source
- light receiving
- position detection
- 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
- 238000001514 detection method Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Description
【発明の詳細な説明】
従来、反射型の光学式位置検出センサは物体の
存在の有無などを判別できる程度のものが多かつ
た。高精度で位置を検出できるものとしては、高
精度のレンズ系をくみ、光路を集束し、その反射
光を判別する手段がとられていたが、この方法は
高価な高精度のレンズ系が必要となり、かつ被検
出物と検出部との距離の変動によりその精度がバ
ラツイたり、外来光の影響を受けたりするので満
足できるものではなかつた。DETAILED DESCRIPTION OF THE INVENTION Conventionally, most reflective optical position detection sensors have been capable of determining the presence or absence of an object. In order to detect the position with high accuracy, a method was used that included a high-precision lens system, focused the optical path, and discriminated the reflected light, but this method required an expensive high-precision lens system. This is not satisfactory because the accuracy varies due to variations in the distance between the object to be detected and the detection unit, and is affected by external light.
本発明者らは２光源、２反射部１受光部からな
る、特に高精度のレンズ系を必要としない安価で
精度の高い位置検出センサを発明した。 The present inventors have invented an inexpensive and highly accurate position detection sensor that does not require a particularly high precision lens system and is composed of two light sources, two reflection sections, and one light reception section.
本発明の構成は第１図に示すごとく同一直線
L1上に等距離ｌで配置された光源Ａと受光部Ｒ
と光源Ｂからなる検出部、及び前述の直線L1に
平行な直線L2上に距離ｌを隔てて２つの反射板、
つまり反射板Ｃ、反射板Ｄを配した指示部からな
り、被検出部ないしは検出されるべき線又は点は
これらの反射板の中点にある。ここで光源及び／
または受光部を光フアイバーを用いて配置するこ
とにより、小さくかつより精度のよい検出部を構
成することもできる。 The configuration of the present invention is as shown in Fig. 1.
Light source A and light receiving part R arranged at equal distance l on L1
and a detection unit consisting of a light source B, and two reflecting plates separated by a distance l on a straight line L2 parallel to the aforementioned straight line L1 ,
In other words, it consists of an indicating section having a reflecting plate C and a reflecting plate D arranged thereon, and the detected part or the line or point to be detected is located at the midpoint of these reflecting plates. Here the light source and/or
Alternatively, by arranging the light receiving section using an optical fiber, a smaller and more accurate detecting section can be constructed.
２つの反射板の中点が受光部の直下に位置した
時の、この両光源から出る主光束は、第２図に示
すごとく、受光部で交わり、一段と強い光を受け
ることができる。 When the midpoint of the two reflectors is located directly below the light receiving section, the principal luminous fluxes emitted from both light sources intersect at the light receiving section, as shown in FIG. 2, allowing even stronger light to be received.
そこで光源Ａと光源Ｂとを互いに重複すること
ない同一周波数の２相のパルスで変調し、この反
射光から両光源の交わり部で得られる２倍の周波
数の変調光を検出することにより精度よく被検出
物の位置を確認することができた。 Therefore, by modulating light source A and light source B with two-phase pulses of the same frequency that do not overlap each other, and detecting the modulated light of twice the frequency obtained at the intersection of both light sources from this reflected light, it is possible to improve accuracy. The position of the object to be detected could be confirmed.
このようにして得られた高精度位置検出センサ
の効果は、安価であり、位置検出精度が高いこ
と、検出部と被検出部の距離の変動について影響
を受けない、また外来光のノイズに対して強いと
いつた点が挙げられる。 The advantages of the high-precision position detection sensor obtained in this way are that it is inexpensive, has high position detection accuracy, is not affected by changes in the distance between the detection part and the detected part, and is resistant to noise from external light. There are some strong points that can be mentioned.
第１図は本発明のセンサにおける各要素の配置
を説明するものであり、第２図はセンサにおける
反射板と受光部の作用を説明するものである。
図中の符号は次の通りである。Ａ，Ｂ……光
源、Ｃ，Ｄ……反射板、Ｒ……受光部。
FIG. 1 explains the arrangement of each element in the sensor of the present invention, and FIG. 2 explains the functions of the reflector and the light receiving section in the sensor. The symbols in the figure are as follows. A, B...light source, C, D...reflector, R...light receiving section.
Claims (1)
源Ａ−受光部Ｒ−光源Ｂを順に同一直線L1上に
等距離ｌで配置した検出部、及び前述の直線L1
に平行な直線L2上に距離ｌを隔てて２つの反射
板を配した指示部からなり、光源Ａと光源Ｂとを
互いに重複することのない同一周波数の２相のパ
ルスで変調し、この反射光から両光源の交わりで
得られる２倍の周波数の変調光を中心部の受光部
で検出し、被検出物の位置を認識するようにした
ことを特徴とする高精度位置検出センサ。1. In a reflective optical position detection sensor, a detection unit in which light source A, light receiving unit R, and light source B are arranged in order on the same straight line L1 at an equal distance l, and the above-mentioned straight line L1
It consists of an indicator with two reflecting plates arranged at a distance l on a straight line L2 parallel to A high-precision position detection sensor characterized in that the position of an object to be detected is recognized by detecting modulated light of twice the frequency obtained from the intersection of both light sources from reflected light using a central light receiving section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP865282A JPS58124906A (en) | 1982-01-22 | 1982-01-22 | Position detecting sensor with high accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP865282A JPS58124906A (en) | 1982-01-22 | 1982-01-22 | Position detecting sensor with high accuracy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58124906A JPS58124906A (en) | 1983-07-25 |
| JPH0116361B2 true JPH0116361B2 (en) | 1989-03-24 |
Family
ID=11698860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP865282A Granted JPS58124906A (en) | 1982-01-22 | 1982-01-22 | Position detecting sensor with high accuracy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58124906A (en) |
-
1982
- 1982-01-22 JP JP865282A patent/JPS58124906A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58124906A (en) | 1983-07-25 |
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