Optical pickup device and optical disk device using the same
US8184509B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2010 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Apr 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Of the beams reflected by an optical disk, only peripheral beams excluding the push-pull region are used to generate a DPD signal in order to optimize internal wire connections among the light receiving areas of the optical detector and thereby reduce the amplification factor of the lens error signal, required for generating the tracking error signal of the DPP method. A beam reflected from a multilayered optical disk is divided into some beam diffraction areas. The divided beam diffraction areas and the light receiving areas are so arranged that the divided beams focus at different positions on the optical detector and that, when a beam is focused on a target recording layer of the disk, stray light from other than the target recording layer being reproduced does not enter into the servo signal light receiving area of the optical detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.