Disc recognizing method for an optical disc playback apparatus

Details Disc recognizing method for an optical disc playback apparatus Disc recognizing method for an optical disc playback apparatus

1993-02-12

1995-09-19

Tupper, Robert S.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369233, 369 4427, 369220, G11B 390, G11B 1700, G11B 2112

Patent

active

054522781

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.

REFERENCES:
patent: 4607357 (1986-08-01), Okano
patent: 4680744 (1987-07-01), Kanamaru
patent: 4829508 (1989-05-01), Arita
patent: 4885733 (1989-12-01), Tsuboi
patent: 4977554 (1990-12-01), Hangai et al.
patent: 5065253 (1991-11-01), Ishii
patent: 5172354 (1992-12-01), Otsubo

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