Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1998-07-08
2000-11-14
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 94, G11B 700
Patent
active
06147942&
ABSTRACT:
A focus control apparatus for a multilayer optical recording medium which performs an appropriate focus jump on a multilayer optical recording medium. This focus control apparatus implements such focus jump control as to temporarily release a focus servo on one layer of a loaded multilayer optical recording medium, shift the focus position of read light on another target layer and then restart the focus servo on the another target layer, detects an ambient temperature, sets a drive signal condition according to the temperature detection output, and moves the focus position of the read light under the set drive signal condition. Specifically, this apparatus generates an acceleration signal to start moving the focus position of read light and a deceleration signal to decelerate movement of the focus position of the read light, as drive signals for a focus actuator in order to execute a focus jump operation, detects an ambient temperature of the focus actuator, and sets signal conditions for the acceleration signal and the deceleration signal according to the detected temperature.
REFERENCES:
patent: 5491677 (1996-02-01), Sasaki et al.
patent: 5568461 (1996-10-01), Nishiuchi et al.
patent: 5612939 (1997-03-01), Ueki et al.
patent: 5740136 (1998-04-01), Tsutsui et al.
Abe Hiroyuki
Kawana Kazushige
Kimikawa Yuichi
Kimura Motoi
Naohara Shinichi
Pioneer Corporation
Psitos Aristotelis M.
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