Carriage servo control system and information-recording...

Details Carriage servo control system and information-recording... Carriage servo control system and information-recording...

2005-04-19

2005-04-19

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S030170

Reexamination Certificate

active

06882600

ABSTRACT:
For reproducing information recorded on an optical disc, a pickup is used to detect a target track on the disc through an optical beam. In carriage servo control, movement of the pickup is servo-controlled in the radial direction of the optical disc. In this control, a tracking error signal is produced by a preamplifier. A pulse signal is produced, in which the period of the pulse signal is set to a constant amount corresponding to the accuracy of movement of the pickup. The duty ratio of the pulse signal is changed based on characteristic of the error signal, so that a changed pulse signal is produced. The changed pulse signal is multiplied by the tracking error signal, so that a carriage control signal is produced. The carriage control signal is supplied to a carriage motor by a driver, so that the pickup is moved.

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patent: 20020041544 (2002-04-01), Sakamoto et al.
patent: 07-192416 (1995-07-01), None

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