Method and apparatus for controlling rotation of an optical disk

Details Method and apparatus for controlling rotation of an optical disk Method and apparatus for controlling rotation of an optical disk

1996-04-04

1997-04-01

Huber, P. W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 47, G11B 700

Patent

active

056173920

ABSTRACT:
A method and apparatus is disclosed for controlling the rotation of an optical disk of the type which has pre-grooves therein. The pre-grooves store wobble signals modulated by data. A first rotation control signal is generated by comparing the phases of the wobble signal reproduced from the optical disk and a reference signal. A second rotation control signal is also generated. This signal is an accelerating control signal for a next given period if the pulse width of the wobble signal is greater than a predetermined reference value when comparing the pulse width of the wobble signal and the predetermined reference value every period of the reference signal. The second signal is a moderating control signal for a next given period if the pulse width of the wobble signal is less than the predetermined reference value. The system and method selectively outputs the second rotation control signal if an error is produced at the time of demodulating the data from the reproduced wobble signal and the first rotation control signal if the data is demodulated normally. Accordingly, an unstable state caused by an operational abnormality during the phase control of a spindle servo system using a wobble signal can be stabilized quickly.

REFERENCES:
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patent: 4757488 (1988-07-01), Nagai et al.
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patent: 5109360 (1992-04-01), Inazumi et al.
patent: 5109369 (1992-04-01), Maeda et al.
patent: 5163035 (1992-11-01), Horikiri

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