Optical encoder with converging means
US4883955A · kind A · utility
9Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Feb 25, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/36
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical encoder comprises a measuring section and a scanning grating plate. The measuring section comprises parallel light beam sources, light receiving elements located in opposition to the parallel light beam sources, converging devices disposed between the parallel light beam sources and the light receiving elements and a main grating plate arranged between the converging devices and the light receiving elements. The scanning grating plate is located between the main grating plate and the light receiving elements while allowing the scanning grating plate to move relative to the measuring section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.