Laser control circuit
US4796267A · kind A · utility
8Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Apr 10, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06835
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a laser control circuit used for an optical disc player. The laser output is digitally modulated, when recording to have high and low levels. The invention provides the laser control circuit capable of controlling the high level and the low level. The circuit is provided with a negative feedback loop in order to stabilize the laser output. Although such negative feedback loop stabilizes the average level of the laser output, the high and low levels may be fluctuated sometimes thereby. The invention also provides for supressing such level fluctuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.