Optical head assembly for optical information player
US5526330A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Jul 25, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head assembly for an optical information reading and reproducing apparatus including a laser for emitting a laser beam directed so as to impinge upon an information carrier disc. Rays of light reflected from the information carrier disc is separated into a reproduction signal detecting beam and two servo signal detecting beams by a path separator prism. The reproduction signal detecting beam enters a reproduction signal detector while the servo signal detecting beams enter an image sensor. The image sensor is so positioned as to cause images of the light beams to assume a substantially equal size. By selecting pixels effective to properly detect focusing and tracking errors, various servo signals can be obtained in dependence on outputs from those pixels selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.