Optical-pickup device and tilt-detecting method thereof
US6545958B1 · kind B1 · utility
40Cited by
8References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1999 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Aug 27, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical-pickup device includes a plurality of light sources, an objective lens for converging light from the plurality of light sources on an optical disc, and at least one light-receiving element for receiving light reflected by the optical disc. A light source of the plurality of light sources, which light source is not used for recording/reproducing, is used for detecting relative tilt between the optical disc and the objective lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.