Apparatus for controlling rotation of disk player

Details Apparatus for controlling rotation of disk player Apparatus for controlling rotation of disk player

1992-03-19

1993-12-14

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 50, 360 7303, G11B 390

Patent

active

052709922

ABSTRACT:
An apparatus for controlling rotation of a spindle motor includes a lock detection unit, a memory unit, a comparison unit, and a control unit. When the lock detection unit detects the lock state of the time base servo loop, a voltage corresponding to the frequency of a read RF signal is stored in the memory unit. When the control unit detects that the rotation velocity of the spindle motor greatly deviates from a normal rotation velocity, it effects a control so as to accelerate or decelerate the spindle motor in dependency upon a compared result of the comparison unit which makes a comparison between a voltage corresponding to the frequency of the read RF signal and a voltage stored in the memory unit.

REFERENCES:
patent: 4727530 (1988-02-01), Tomisawa
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 4885644 (1989-12-01), Ishii et al.

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