Optical pickup
US4480325A · kind A · utility
18Cited by
5References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1983 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | Mar 4, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup wherein a semiconductor laser device for projecting a laser beam onto an optical disc is driven by a D.C. current and a high-frequency current superposed thereon, and the laser device oscillates in a multiple longitudinal mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.