Method and optical recording/reproducing apparatus for optimizing laser beam power
US5134606A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Jul 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for recording and reproducing information onto or from a rotating magnetooptic disc such that optimal laser power is maintained throughout the recording process. A test recording laser beam undergoes stepwise power changes as the recording position along a track of the disc changes. The recording signal is read out by a reproducing mechanism corresponding to the stepwise power change. A correcting mechanism utilizes the read-out signal to obtain the optimal power of the recording laser beam. Then, routine recording is carried out utilizing the optimal laser power. As routine recording is carried out, the optimal laser power is corrected depending upon the radial distance of the track being recorded from the center of the disc. As a result, optimal laser power is maintained regardless of the track position on the magnetooptic disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.