Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-11-04
1999-05-11
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 4425, 369 94, G11B7/09
Patent
active
059035307
ABSTRACT:
An apparatus for reproducing record information of a multiple-layered optical disc is provided with: an optical pickup having a light source for emitting a reading light, an objective lens for condensing the emitted reading light onto one of the information record layers, a focus actuator for moving the objective lens in a focus direction, and a light-detection device for detecting the reflected reading light and outputting a light detection signal; a focus error generation device for generating a focus error signal; an acceleration/deceleration signal generator for generating and outputting to the focus actuator an acceleration signal to accelerate the objective lens in the focus direction and a deceleration signal to decelerate the objective lens in the focus direction; an inter-layer distance measurement device for measuring an interlayer distance between the information record layers of the multiple-layered optical disc; and a controller for measuring a time duration since the acceleration signal is generated until the focus error signal reaches a predetermined threshold level, and for controlling the acceleration/deceleration signal generator to set a magnitude of the deceleration signal on the basis of the measured inter-layer distance and the measured time duration.
REFERENCES:
patent: 5682372 (1997-10-01), Yamakawa et al.
patent: 5740136 (1998-04-01), Tsutsui et al.
patent: 5754507 (1998-05-01), Nishikata
Takahashi Kazuo
Tateishi Kiyoshi
Pioneer Electronic Corporation
Tran Thang V.
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