Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
US5297114A · kind A · utility
27Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1991 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Nov 29, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In the magneto-optic recording/reproduction apparatus, a light beam from a semiconductor laser that can be used with two wavelengths, for recording and reproduction is converged by an objective lens on a magneto-optic disk, a predetermined offset is added to this focusing error signal by an offset adjusting circuit, and the objective lens is driven in the direction of the optical axis based on the focusing error signal to which an offset was added.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.