JPS6441819A - Position detecting apparatus - Google Patents
Position detecting apparatusInfo
- Publication number
- JPS6441819A JPS6441819A JP19850287A JP19850287A JPS6441819A JP S6441819 A JPS6441819 A JP S6441819A JP 19850287 A JP19850287 A JP 19850287A JP 19850287 A JP19850287 A JP 19850287A JP S6441819 A JPS6441819 A JP S6441819A
- Authority
- JP
- Japan
- Prior art keywords
- light
- mask
- photodetector
- code plate
- light source
- 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
- Optical Transform (AREA)
Abstract
PURPOSE:To decrease nonlinear errors and to enhance resolution in position detection, by continuously scanning the light from a light source on a code plate, a mask and a photodetector. CONSTITUTION:The light from a light source is continuously scanned on a code plate 23, a mask 24 and a photodetector 25. Thus, the output of the change in light amount from the photodetector caused by said scanning for Moire fringes due to the code plate 23 and the mask 24 becomes continuous. When the light from the single light source is continuously scanned, the amount of the emitted light becomes uniform and constant. Therefore, the highly accurate detection of a minute position can be performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19850287A JPS6441819A (en) | 1987-08-07 | 1987-08-07 | Position detecting apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19850287A JPS6441819A (en) | 1987-08-07 | 1987-08-07 | Position detecting apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6441819A true JPS6441819A (en) | 1989-02-14 |
Family
ID=16392199
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19850287A Pending JPS6441819A (en) | 1987-08-07 | 1987-08-07 | Position detecting apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6441819A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005050141A1 (en) * | 2003-11-20 | 2005-06-02 | Mitsubishi Denki Kabushiki Kaisha | Optical encoder |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS576996A (en) * | 1980-06-17 | 1982-01-13 | Tokyo Optical | Absolute encoder |
JPS61221616A (en) * | 1984-09-29 | 1986-10-02 | Satoru Toyooka | Optical measuring method for fine displacement |
-
1987
- 1987-08-07 JP JP19850287A patent/JPS6441819A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS576996A (en) * | 1980-06-17 | 1982-01-13 | Tokyo Optical | Absolute encoder |
JPS61221616A (en) * | 1984-09-29 | 1986-10-02 | Satoru Toyooka | Optical measuring method for fine displacement |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005050141A1 (en) * | 2003-11-20 | 2005-06-02 | Mitsubishi Denki Kabushiki Kaisha | Optical encoder |
US7285769B2 (en) | 2003-11-20 | 2007-10-23 | Mitsubishi Denki Kabushiki Kaisha | Optical encoder with reduced reflected light error having a light non-transparent portion with inclined surfaces |
KR100867053B1 (en) * | 2003-11-20 | 2008-11-04 | 미쓰비시덴키 가부시키가이샤 | Optical encoder |
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