Optical information recording/reproducing apparatus
US5101389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1990 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Aug 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10576
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording/reproducing apparatus comprises a semi-reflecting means which receives a emitted laser light emitted from a light source, which reflect partially the received laser light toward an optical information recording medium in order to record an information, and which transmits a reflected laser light reflected by the optical information recording medium, a separating means which has the semi-reflecting means on one surface thereof, which diffracts a part of the transmitted laser light, transmits the other part of the transmitted laser light, and then subsequently diffracts said diffracted light again to produce twice diffracted light and transmits said transmitted light again to produce twice transmitted light, and a detecting means which detects the diffracted laser light and the transmitted laser light to thereby generate an information reproduction signal, a track error signal and a focus error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.