Optical disk apparatus capable of correcting tracking error

Details Optical disk apparatus capable of correcting tracking error Optical disk apparatus capable of correcting tracking error

2005-05-17

2005-05-17

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044290, C369S044350

Reexamination Certificate

active

06894957

ABSTRACT:
Information is extracted from a track by a pickup during rotation of an optical disk, the output of the pickup is supplied to a head amplifier to generate an information signal including disk record information and a tracking error signal, and a reading-out speed is detected from the information signal from the head amplifier. The frequency component which is near the rotation frequency of the disk within the range of the change in the reading-out speed of the information is extracted from the detected reading-out speed signal, an eccentricity signal showing a position deviation between the center point of the track of the disk and the rotation center point of the disk is output from a band-pass filter, the output of the filter is substantially added to the output of the tracking control circuit, and a tracking actuator is driven and controlled to correct a tracking error.

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