Optical head device for recording and reproducing information
US4935911A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | May 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10543
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head device for recording and reproducing information includes beam splitting and converging mechanisms which has a first portion and a second portion secured to the first portion and is disposed on an optical path of light reflected from a photo-magnetic disk. The first portion is adapted to split the reflected light received by the beam splitting and converging means into two beams which propagate in at least two directions different from each other and adapted to proportion the amount of reflected light in each of the two beams by means of the magnitude of the p-polarized component contained in the reflected light. The second portion is adapted to converge separately the two split beams. The converged two beams are used for reproducing binary data in the photo-magnetic disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.