Laser power control with defocusing offset during data recording
US5383175A · kind A · utility
6Cited by
11References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Dec 17, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser control system for use with an erasable optical disk device to minimize laser feedback during a recording operation. Focus control circuits are utilized to establish a slightly defocused condition prior to a recording operation and maintaining that slightly defocused condition throughout the recording operation. Defocusing the write beam significantly reduces feedback and thereby significantly increases pulse-to-pulse repeatability of the write pulse amplitude at the optical disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.