Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1997-01-17
1999-10-05
Neyzari, Ali
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 32, G11B 509, G11B 1722
Patent
active
059635177
ABSTRACT:
An method to prevent excessive heat generation of the pickup actuator from occurring when a disk has a large eccentricity or planar vibration in a high-speed disk reproducing apparatus using an optical pickup. The disk reproducing apparatus has a status determining arrangement for monitoring a present actuator drive state, an analyzing arrangement for analyzing an output signal of the status determining arrangement, and disk rotational speed switching control arrangement for selecting disk reproducing speeds according to a control signal of the identification means, thereby lowering the reproducing speed when the eccentricity or planar vibration is large. Such invention prevents heat generation of the pickup actuator from occurring because high-speed reproduction can be performed when the eccentricity or planar vibration is small, and reproduction speed can be automatically reduced when the eccentricity or planar vibration is large.
REFERENCES:
patent: 4984227 (1991-01-01), Yoshimaru
patent: 5691968 (1997-11-01), Tomishima et al.
Furuichi Tokinori
Koike Ryuichi
Nakagaki Harushige
Oda Kazuhiro
Suenaga Hideo
Hitachi , Ltd.
Neyzari Ali
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