Optical disc apparatus and back off control method for objective lens
US8315131B2 · kind B2 · utility
0Cited by
2References
8Claims
0Family size
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Key dates
| Filing date | Aug 1, 2006 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Sep 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/121
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical disc apparatus, when a signal to be generated corresponding to an amount of reflected light from an optical disc has a signal level below a threshold level for a period exceeding a reference period, a controller controls an actuator to move an objective lens in a direction such that a distance from the optical disc surface to the objective lens increases. The reference period may be set based on a type of the optical disc and a recording or reproducing speed of the optical disc, or based on a surface deflection of the optical disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.