Optical disc tracking system with switching of tracking error signals at boundary between track guide and track address
US4787076A · kind A · utility
33Cited by
11References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1986 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Sep 25, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0956
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tracking system for positioning a light spot onto a magneto-optic disc having a beam guide track preformatted thereon, includes a main light beam and two auxiliary light beams, and a circuit for switching between a low frequency component of a tracking error signal, detected by respective auxiliary light beam detectors, and a tracking error signal detected by a main light beam detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.