Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1986-10-02
1990-01-23
Stephan, Steven L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
358338, 360 25, 360 27, 360 7303, 369 50, 369 59, 369124, G11B 2108
Patent
active
048963119
ABSTRACT:
An optical disk apparatus reads identification data recorded at a predetermined timing in a predetermined position of a loaded optical disk. The type of the optical disk is judged according to the identification data. That is, a judgment is made as to whether the optical disk is a CAV type, in which the recording/reproduction timing, i.e., the demodulation/modulation frequency, is constant irrespective of the access position on the disk, or whether it is of M-CAV type, in which the recording/reproduction timing, is varied according to the access position. According to the result of judgement, the recording/reproduction timing, with respect to the optical disk, is controlled for recording or reproduction of data. The optical disk apparatus can be used with both types of optical disk.
REFERENCES:
patent: 4357635 (1982-11-01), Hasegawa
patent: 4532621 (1985-07-01), Nakagawa
patent: 4558375 (1985-12-01), Sontheimer
patent: 4564867 (1986-01-01), Nakajima
patent: 4751693 (1988-06-01), Yoshimaru
EPO Communication Reference 61P200/wa dated Apr. 22, 1988 for EPO Application 86113695.0-2210.
Abstract of Japanese Patent Application 59-157873, "Retrieving Device for Position of Target Track".
Patent Abstracts of Japan, vol. 7, No. 48 (P-178) [1193], Feb. 24th 1983; & JP-A-57 195 366 (Pioneer) 01-12-1982.
Japanese Patent Disclosure (KOKAI) No. 60-117448, M. Yamamuro et al. (transliterated).
Kabushiki Kaisha Toshiba
Stephan Steven L.
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