Optical pick-up device and method using a high-density double diffraction grating
US5956302A · kind A · utility
18Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Jun 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pick-up having a high-density double diffraction grating constructed with two high-density diffraction gratings superposed on each other wherein polarized light rays are separated so that P-polarized light rays pass through the double diffraction grating and S-polarized light rays are diffracted. The optical pick-up is disposed in the optical path between a light source and a recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.