Optical pickup and optical information recording and reproducing apparatus
US8451703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2011 |
| Grant date | May 28, 2013 |
| Priority date | — |
| Expiry date | Sep 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup includes a light source, an optical system for irradiating a recording medium including a plurality of recording layers with light from the light source, a diffraction optical element that divides light reflected from the recording medium into a plurality of optical fluxes and diffracts the fluxes, and an optical detector receiving the optical flux diffracted by the diffraction optical element. The optical detector includes a light receiving element detecting a focus error signal, wherein a longitudinal direction of the light receiving element is arranged to coincide with a circumferential direction of the recording medium, or arranged to be inclined to a circumferential or radial direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.