Rotation control device for information recording disc
US4542423A · kind A · utility
13Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Oct 12, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A rotation control device causes a disc on which information and sync signals are recorded to rotate at a predetermined speed. The control device includes a generator for generating a signal whose frequency is identical with that of a rotation signal which will be output from a frequency generator while the disc rotates at the predetermined speed. A control loop is defined which compares a phase of an output of the signal generator and a rotation signal output from the frequency generator, thereby controlling the drive of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.