Disk storage which automatically adjusts to optimum recording/reproducing level
US5247509A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10597
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical or magneto-optical disk storage which automatically adjusts a recording/reproducing level of a number of kinds of optical or magneto-optical disks having different recording/reproducing levels to an optimum recording/reproducing level. The optical or magneto-optical disk storage has an attenuator which applies a predetermined attenuation amount to a reproduced signal reproduced from an optical or magneto-optical disk so as to attenuate the reproduced signal, or intensity adjusting means for adjusting the intensity of a laser beam used for recording and/or reproducing. The optical or magneto-optical disk storage detects an amplitude of the reproduced signal and feed-back-controls the attenuation amount or intensity of the laser beam in accordance with the detected amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.