Rotation control apparatus for controlling rotation frequency of

Details Rotation control apparatus for controlling rotation frequency of Rotation control apparatus for controlling rotation frequency of

1986-09-02

1988-07-12

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369240, G11B 1924

Patent

active

047574895

ABSTRACT:
A rotation control apparatus controls a rotation frequency of a disc which is to be rotated at a constant linear velocity. The rotation control apparatus comprises a circuit for obtaining a first signal having a first frequency proportional to a rotation frequency of the disc, a circuit for comparing the first signal with a second signal having a second frequency which successively increases, and a control device for obtaining a present rotation frequency of the disc from the second signal which is obtained at a time when the first and second frequencies become equal to each other. The control device supplies to a motor which rotates the disc a driving signal which is obtained from the present rotation frequency in a recording mode, so that the disc rotates at the constant linear velocity.

REFERENCES:
patent: 4190860 (1980-02-01), Somer et al.
patent: 4228326 (1980-10-01), Dakin et al.
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4388713 (1983-06-01), Tatsuguchi
patent: 4439849 (1984-03-01), Nabeshima
patent: 4530018 (1985-07-01), Hoshino et al.
patent: 4623939 (1986-11-01), Machida et al.
patent: 4638375 (1987-01-01), Motoyama

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