Optical disk recording/reproducing method and apparatus for preventing wave length shift during recording and reproducing operations
US6072762A · kind A · utility
8Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1999 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Apr 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Between a semiconductor laser diode and an optical disk, a collimator lens for collimating a laser beam output from the semiconductor laser diode, a liquid crystal optical shutter for attenuating the collimated beam having passed through the collimator lens, and a beam splitter for splitting reflected light from the optical disk are disposed. In addition, a collective lens for collecting the collimated beam obtained by the collimator lens on a data holding surface of the optical disk is further disposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.