Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-12-20
2005-12-20
Patel, Gautam R. (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044260
Reexamination Certificate
active
06977873
ABSTRACT:
A system and method for dynamically re-calibrating an optical disc drive during operation is provided. The optical media includes a pitted premastered area that cannot be overwritten and a grooved user-writeable area that can be overwritten. The system can attempt several increasing levels of effort to recalibrate the disc drive until the disc drive reaches a desired level of performance, or the recalibration effort levels are exhausted. During each level of recalibration effort, various calibration values are determined for the optical media and the servo actuator, along with a notch frequency for a notch filter; a focus actuator offset; a tracking actuator offset; a focus control loop gain; and a tracking control loop gain. The optical media disc is divided into zones, and zone calibration tables for each of the zones are generated. Each zone is recalibrated using the corresponding zone calibration table. The calibration values can be stored and used during subsequent recalibration efforts, such as adjusting the focus control loop gain and/or the tracking control loop gain.
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Kadlec Ron J.
Turner Christopher J.
Wach Hans B.
Watt Charles R.
DPHI Acquisitions, Inc.
Hallman Jon
MacPherson Kwok Chen & Heid
Patel Gautam R.
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