Optical disc apparatus with selection of three-beam and push-pul

Details Optical disc apparatus with selection of three-beam and push-pul Optical disc apparatus with selection of three-beam and push-pul

1993-11-23

1994-11-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 4435, 369 4437, 369 58, G11B 7095

Patent

active

053633580

ABSTRACT:
An optical disc apparatus continues the tracking operation even if a pickup reaches an unrecorded portion of a disc during the reproduction of an information signal. The apparatus discriminates whether the reading position of the pickup is at the recorded part or the unrecorded part according to a result of a comparison using a signal level read out, by the pickup, from a region other than a predetermined region. In accordance with the result of the discrimination, the tracking servo operation is switched to either one of a three-beam system and a push-pull system.

REFERENCES:
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5079757 (1992-01-01), Wachi et al.
patent: 5173886 (1992-12-01), Satoh et al.
patent: 5202873 (1993-04-01), Ito et al.
patent: 5212675 (1993-05-01), Yoshino et al.
patent: 5268883 (1993-12-01), Yamaguchi et al.
Patent Abstracts of Japan, vol. 17, No. 141, (P1506), Mar. 23, 1993, & JP04-313819.

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