Optical pickup device
US5144614A · kind A · utility
7Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1992 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Feb 14, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup device is disclosed in which a light beam from a laser light source is converged by an object lens on a signal recording surface of an optical disk to follow recording tracks formed on the signal recording surface to read out or write data on or from the signal recording surface. A semiconductor laser unit is used as a laser light source and is so arranged that the meridional plane of the light beam emanating from the semiconductor laser unit is inclined 30.degree. to 60.degree. with respect to the tangential direction of the recording track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.