Disc playback apparatus
US4682314A · kind A · utility
9Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1983 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Aug 26, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2537
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disc playback apparatus using an optical pickup or the like, any flaws on a track of the disc are detected using: a first level detector for detecting a maximum value level of a recording information signal of an output of the pickup; a second level detector for detecting a change of the maximum value level of the recording information signal; and a comparator for comparing outputs of the above first and second level detectors. When any flaws are detected, a driving signal of a driving device for the pickup is held to a fixed reference potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.