Disc recognizing method for an optical disc playback apparatus
US5452278A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1993 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Feb 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0037
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc recognizing method prevents a leaf spring of a pickup from being deformed in an optical disc playback apparatus including a pickup transfer for moving a pickup and a plurality of starting point detecting switches for recognizing a type of a seated disc. The method includes a disc recognizing step of recognizing the seated disc by virtue of an on state of a first starting point detecting switch which corresponds to the starting point of a laser disc when a playback mode is selected, a disc recognizing step of recognizing the seated disc by virtue of an on state of a second starting point detecting switch which corresponds to a compact disc, and a disc recognizing step of recognizing the seated disc by inwardly transferring the pickup for a predetermined period of time when a focusing operation fails after the first starting point detecting switch has been turned on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.