Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Patent
1992-03-20
1995-12-19
Levy, Stuart S.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
369 32, 369 50, G11B 1706, G11B 2108, G11B 1924
Patent
active
054775221
ABSTRACT:
An apparatus and method for controlling spindle motor of compact disc utilizing appliance are disclosed, in which the spindle motor is controlled early to meet a rotation speed on a target track, in a rough search, so that a phase locked loop (PLL) servo is normally operated, immediately after the search, thereby enabling the time required in accessing information to be reduced. The apparatus includes a device for detecting the rotation speed of the spindle motor. In the search mode, the frequency corresponding to the detected rotation speed of the spindle motor is compared with a reference frequency corresponding to a rotation speed on the target track. A signal indicative of the comparison result is differentially amplified, to control the spindle motor to correspond to the rotation speed on the target track, in the search mode. After a compact disc has been loaded, the rotation speed in a track corresponding to a reference position at which a reference value is set is detected, so that the inherent deviation in constant linear velocity is calculated, based on the reference value, and corrected upon calculating the number of tracks.
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Patent Abstracts of Japan vol. 14, No. 25 (P-991) (JP A-1264663).
Patent Abstracts of Japan vol. 13 No. 505 (P-959) JPA1204278.
Goldstar Co. Ltd.
Levy Stuart S.
Miller Brian E.
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