Deflection plate for optical pick-up device
US5475670A · kind A · utility
33Cited by
16References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1993 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Sep 29, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1353
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A deflection plate for deflecting laser beams includes a transparent plate on which two grating areas are formed on the same surface. The first grating area has a plurality of parallel grooves. The second grating area has a plurality of grooves in a predetermined pattern. The depth and/or the duty ratio of the grooves in the first grating area differs from that in the second grating area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.