Spindle motor driver

Details Spindle motor driver Spindle motor driver

1995-12-29

1997-12-16

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4428, 369 4429, 369 4435, 360 7303, G11B 700, G11B 1926

Patent

active

056993358

ABSTRACT:
A spindle motor driver is provided. The spindle motor driver includes a spindle motor for rotating an optical disc, an optical head for reading signals from the optical disc to reproduce the information recorded on the optical disc, a processor for processing the detected signals, and a constant linear velocity (CLV) servo for controlling the spindle motor to rotate with a CLV according to the signal processed by the processor. A constant angular velocity (CAV) servo is connected in parallel to the CLV servo to control the spindle motor to rotate with a CAV when the optical head performs jumping. Additionally, a feedback loop is provided between the spindle motor and the CAV servo for feeding back the rotation speed signal of the optical disc. A switching means selectively connects the processor with the CAV servo and the CLV servo. Thus, access time of the optical head can be effectively shortened.

REFERENCES:
patent: 4855978 (1989-08-01), Kanawaru
patent: 5051976 (1991-09-01), Kawano
patent: 5425014 (1995-06-01), Tsuyuguchi

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