Optical information processing apparatus, optical pick-up device and optical recording disc system
US7502303B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2005 |
| Grant date | Mar 10, 2009 |
| Priority date | — |
| Expiry date | Apr 27, 2027 |
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 diode, an objective lens for focusing a light beam emitted from the laser diode on an optical disc, an optical detector for receiving a reflected beam from the optical disc, a beam splitter for causing the light beam emitted from the laser diode and a reflected beam to pass therethrough or reflect, a front monitor for receiving the light beam emitted from the laser diode, and a front monitor light-guiding plate for guiding a part of the light beam emitted from the laser diode to the front monitor. The front monitor light-guiding plate is arranged between the laser diode and the objective lens and has a region having a predetermined shape for causing the part of the light incident thereon to change a traveling direction thereof by refraction and then reach the front monitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.