Controlling optical pickup of optical disk drive by detecting change of sampling signals taken from a motor drive signal
US6954414B2 · kind B2 · utility
3Cited by
11References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 1, 2002 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Feb 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08529
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive current or a drive voltage is controlled corresponding to change of load by sampling the drive current or drive voltage of a motor to move an optical pickup and then detecting change of the sampling signal as change of the optical pickup when it is moved. Moreover, change of the sampling signal is obtained from a difference of the sampling signals by comparing these sampling signals at the first and second points. Comparison of these sampling signals is conducted in unit of drive pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.