Magneto-optical head with separate optical paths for error and data detection
US4918675A · kind A · utility
17Cited by
13References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Jan 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10532
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical head using a laser source unit with a focus error and a tracking error detector in substantially the same optical path as the originating laser beam. In this invention the stored information is derived from the beam reflected by a beam-splitter, while the transmitted light is utilized for generating the tracking error and the focus error signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.