Optical disk reproducing device provided with improved spindle motor control
US5784346A · kind A · utility
2Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Feb 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk reproducing device has a spindle servo control in which when a focusing error or a tracking error occurs, the spindle control voltage immediately before the error occurred is detected and stored in a memory. During the spindle servo is being off, the spindle control voltage is retrieved from the memory and applied to the spindle motor. Because the spindle motor is rotating at a speed corresponding to the track now being traced during the spindle servo off period, the spindle servo can be established quickly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.