JPS5636014A - Detection method - Google Patents
Detection methodInfo
- Publication number
- JPS5636014A JPS5636014A JP11227679A JP11227679A JPS5636014A JP S5636014 A JPS5636014 A JP S5636014A JP 11227679 A JP11227679 A JP 11227679A JP 11227679 A JP11227679 A JP 11227679A JP S5636014 A JPS5636014 A JP S5636014A
- Authority
- JP
- Japan
- Prior art keywords
- scale
- photodetectors
- light sources
- lens
- light
- 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 improve the accuracy of a scale by computing signal different in phase produced with the irradiation of light at the same point thereon from different directions.
CONSTITUTION: A main scale 3 is moved in the direction of the arrow and an index scale 4 is fixed parallel to the main scale 3. A collimating lens 5 is placed in front of the index scale 4 and a collimating lens 6 is on the back of the main scale with axis X-X parpendicular to the scale as optic axis. Four fine light sources y1Wy4 are arranged close to the plane where the focal point of the lens 6 is positioned and photodetectors Y1WY4 are arranged on the forcal surface of the lens 6. The light of the light sources y1 and y4 is condenced on the photodetectors Y1WY4 through scales 3 and 4. The light sources y1, y2, y3 and y4 are so positioned that a strip signal of the moire shifts in sequence by 90° in the direction in which the scales moves and the use of a signal obtained from the photodetectors Y1WY4 enables indication of displacement without errors.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11227679A JPS5636014A (en) | 1979-08-31 | 1979-08-31 | Detection method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11227679A JPS5636014A (en) | 1979-08-31 | 1979-08-31 | Detection method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5636014A true JPS5636014A (en) | 1981-04-09 |
Family
ID=14582638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11227679A Pending JPS5636014A (en) | 1979-08-31 | 1979-08-31 | Detection method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5636014A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57169613A (en) * | 1981-04-13 | 1982-10-19 | Tokyo Optical Co Ltd | Photoelectric encoder |
JPS57169612A (en) * | 1981-04-13 | 1982-10-19 | Tokyo Optical Co Ltd | Photoelectric encoder |
-
1979
- 1979-08-31 JP JP11227679A patent/JPS5636014A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57169613A (en) * | 1981-04-13 | 1982-10-19 | Tokyo Optical Co Ltd | Photoelectric encoder |
JPS57169612A (en) * | 1981-04-13 | 1982-10-19 | Tokyo Optical Co Ltd | Photoelectric encoder |
JPH0128887B2 (en) * | 1981-04-13 | 1989-06-06 | Tokyo Optical | |
JPH0128886B2 (en) * | 1981-04-13 | 1989-06-06 | Tokyo Optical |
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