Disk apparatus
US5175654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1991 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jun 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1258
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk apparatus of zone-recording type having a plurality of recording zones is structured such that a plurality of reference clock signals, each corresponding to a recording zone, are generated in both a recording mode and a reproducing mode. A reference frequency signal means, for generating an oscillating signal of a reference frequency, is combined with a variable frequency forming phase locked circuit. A first switch selectively causes the phase locked circuit to perform the phase locking in response to the reference frequency signal generated from the reference signal means or the reproducing signal. A demultiplying means switches a demultiplying ratio according to the mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.