Optical pick-up apparatus
US7345820B2 · kind B2 · utility
2Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2005 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Jan 30, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compatible optical pick-up apparatus, which records to and/or reproduce from both digital versatile disc (DVD)-type optical disks and compact disc (CD)-type optical disks for improving a signal regeneration capacity and a tracking capacity in operation at a high temperature. A polarized hologram of the optical pick-up apparatus is divided into six diffraction regions. The rays of a first light diffracted at the first and second diffraction regions are separately received by divided parts of a first bisected light-receiving portion of a photodetector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.