Recording or reproducing apparatus having a spindle servo control linked to laser power control
US5805546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Dec 9, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2529
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording device for a disc-like recording medium having some recording tracks formed by grooves wobbled in response to their absolute positional information and the track including a linking area for controlling laser power, the recording device comprising an information reader for reading information from the disc-like recording medium, a frequency information extractor for extracting groove frequency information from information extracted by the information reader, a frequency measurer for measuring the frequency of the frequency information extracted by the frequency information extractor, a recorder for performing a recording operation in respect to the disc-like recording medium, a discriminator for discriminating whether a rotating speed of the disc-like recording medium has reached a suitable rotation velocity or not, and a controller for controlling a laser power at the linking area in advance for a recording operation if the rotating speed has reached a suitable rotation velocity in accordance with a result of the discriminator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.