Optical storage apparatus which detects a lens position signal without a lens position sensor
US5870356A · kind A · utility
19Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08541
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When a pull-in to a target track due to a turn-on of a tracking servo unit fails and a seek error is detected, a seek error processing unit turns on, for example, a low speed lens lock control unit and controls a VCM so as to set an optical axial deviation of an objective lens to zero, thereby subsequently allowing a retry seek to be executed. The turn-on of the low speed lens lock control unit by the seek error processing unit is performed for a specified time after the detection of the seek error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.