Optical information processing apparatus, optical pick-up device and optical recording disc system
US7948858B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2009 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Aug 15, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pick-up device includes a laser source enabling emission of at least two light beams with different wavelengths, an objective lens which focuses the light beams emitted from the laser source on an optical disc, an optical detector which receives a light reflected from the optical disc, a front monitor which receives a part of the light beams emitted from the laser source, a front monitor light-guiding plate which guides part of the light beams emitted from the laser source to the front monitor. The front monitor light-guiding plate is arranged between the laser source and the objective lens, at least a part of a region of the front monitor light-guiding plate illuminated by the light beams emitted from the laser source has a predetermined shape which causes the light beams to change traveling direction thereof by refraction and then be guided to the front monitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.