Self-synchronizing clock source for optical memories
US4290122A · kind A · utility
49Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1979 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Periodic clock pulses are pre-recorded on each servo track of an optical disk to provide a local self-synchronizing source of clock frequency information for read only or direct read after write optical digital disk memories. In keeping with accepted practices, the servo track or tracks additionally function as references for controlling the radial positioning of a read head or a read/write head of such a memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.