Scale for reflective photoelectric encoder and reflective photoelectric encoder
US7109472B2 · kind B2 · utility
0Cited by
1References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2005 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Mar 14, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1857
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a scale for a reflective photoelectric encoder in which a reflective film is not formed on the side faces of phase gratings, an edge angle θ of the phase grating is set larger than 80 degrees and less than 90 degrees. Accordingly, stable diffraction efficiency is obtained, even if there are variations in the shape and size of the gratings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.