Disk drive apparatus

Details Disk drive apparatus Disk drive apparatus

1991-06-24

1993-06-08

Dzierzynski, Paul M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7301, G11B 1920

Patent

active

052184919

ABSTRACT:
Disk drive apparatus for reproducing information signal from a disk on which the information signal and a servo sector pulse are recorded, which includes sampling circuit for sampling an output of a counter. A speed control signal is generated by detecting a difference between continuous sampling values, and a spindle motor is control by the speed control signal. When the rotational speed is slow, the sampling is performed by a detection output for the spindle motor, and when the rotational speed is nearly equal to a normal speed, that is performed by the sector pulse.

REFERENCES:
patent: 4420715 (1983-12-01), Lecourtier et al.
patent: 4477750 (1984-10-01), Collins et al.
patent: 4780773 (1988-10-01), Hama

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