Patent · US Expired

Self-synchronizing clock source for optical memories

US4290122A · kind A · utility

49Cited by
8References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 14, 1979
Grant dateSep 15, 1981
Priority date
Expiry dateMay 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.