Data reproducing apparatus using idling current
US4918681A · kind A · utility
19Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 24, 1987 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Dec 24, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A data reproducing apparatus is disclosed which permits stabilization of the light output of a light source, thereby to permit reliable reproduction of data. When recording data on an optical disk and also when reproducing the recorded data by illuminating the optical disk by means of a laser beam from a semiconductor laser, an idling current is supplied in advance to the semiconductor laser, to such an extent that the semiconductor laser does not emit a laser beam. As a result of the preliminary supply of the idling current, the output of the semiconductor laser is stabilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.