Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-05-08
2007-05-08
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044320
Reexamination Certificate
active
10629917
ABSTRACT:
An optical disk device comprises position control portions which carry out position control of at least one of an optical head and an objective lens based on a detection signal from the optical head, and disturbance learning portions which reduce a compensation gain of the position control portion in a range in which servo control is not deviated, and detect disturbance information of the optical disk to store it as learning disturbance information. Fine disturbance information can be reliably learned because the information is not affected by the compensation gain.
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Jpn. Pat. Appln. KOKAI Pub. No. 8-77589 “Optical Disk Apparatus”; Mitsubishi Electric Corporation; published on Mar. 22, 1996, *Concise Explanation, This document discloses a method of varying the gain of a control system, on the basis of correlation between an error signal of a previous period and an error signal of a current period, See p. 1 of this application.
Jpn. Pat. Appln. KOKAI Pub. No. 9-50303 “Repeat Compensator and Disk Apparatus having the Same”; Mitsubishi Electric Corporation; published on Feb. 18, 1997, *Concise Explanation, This document discloses a method of varying the gain of a control system, on the basis of correlation between an error signal of a previous period and an error signal of a current period.
Jpn. Pat. Appln. KOKAI Pub. No. 11-86309 “Optical Disk Control Apparatus”; Sony Corporation; published on Mar. 30, 1999, *Concise Explanation, This document discloses a learning compensator, which has a signal generating circuit adapted to change of the rotation number and generates a learning timing, See p. 2 of this application.
Kabushiki Kaisha Toshiba
Pham Van T.
Pillsbury Winthrop Shaw & Pittman LLP
Tran Thang V.
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