Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-12-11
2007-12-11
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112010
Reexamination Certificate
active
10879779
ABSTRACT:
A method and an optical disk apparatus that can accurately and stably correct the spherical aberration even for a blank write-once optical disk and can detect a spherical aberration error signal with a simple construction of parts in real time. In a blank write-once disk20, the tracking servo is switched to an inoperative state, push-pull signals from outputs of the photodetector12are detected in a state of “in focus” and in a state of “out focus,” respectively, by a push-pull signal generation circuit34, and.the amplitudes of these push-pull signals are subjected to difference calculation in a spherical aberration error detector31to obtain a spherical aberration error signal A. Then, the spherical aberration is corrected with this spherical aberration error signal A, and subsequently a specific pattern signal is recorded in a trial writing area, this signal is reproduced in the state of “in focus” and in the state of “out focus,” respectively, the amplitude of each reproduced signal is acquired by a reproduced signal generation circuit32, these amplitudes are subjected to difference calculation in the spherical aberration error detector31to obtain a spherical aberration error signal B. The spherical aberration is corrected with this.
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Fujita Shinji
Isshiki Fumio
Maeda Nobuyuki
Agustin Peter Vincent
Hitachi , Ltd.
McDermott Will & Emery LLP
Tran Thang V.
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