Optical disk reproducing apparatus for controlling the rotationa

Details Optical disk reproducing apparatus for controlling the rotationa Optical disk reproducing apparatus for controlling the rotationa

1995-07-20

1996-05-28

Hindi, Nabil Z.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369124, G11B 700

Patent

active

055218954

ABSTRACT:
An optical disk reproducing apparatus uses a spindle motor having a low torque to reduced power consumption and manufacturing cost while maintaining a low error rate for reproduced data. The spindle motor is rotated at a constant rotational speed under a CAV control when a pick-up is moved. The rotational speed of the spindle motor is switched to a reference linear speed under a CLV control when a reproducing operation is performed. The reference linear speed is established for each of the zones of a recording area of an optical disk. The reference linear speed is determined by generating a zone clock set for each of the zones. A frequency error signal is generated by comparing the zone clock with the reproduction data so as to maintain the spindle motor at the reference linear speed determined by the zone clock.

REFERENCES:
patent: 5278814 (1994-01-01), Deguchi et al.

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