Access control system for rotating an information storage disc a

Details Access control system for rotating an information storage disc a Access control system for rotating an information storage disc a

1987-09-23

1989-09-12

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369267, 369240, G11B 1706, G11B 1924

Patent

active

048666955

ABSTRACT:
In a control system for a disc player for a CLV (constant linear velocity) type disc, in order to control a rotation of a spindle motor in response to a location of the disc to be read, there is provided a tachometer coupled to the motor for generating a rotation signal having a frequency corresponding to a rotation of the motor, signal generator for generating a reference signal having a frequency corresponding to the rotation suitable to the location to be read, and a drive circuit for controlling the rotation of the motor so that rotation is effected in accordance with the reference signal.

REFERENCES:
patent: 4079942 (1978-03-01), Kunen
patent: 4223349 (1980-09-01), Dakin et al.
patent: 4450552 (1984-05-01), Marcantonio
patent: 4530083 (1985-07-01), Ishihara
patent: 4750055 (1988-06-01), Van et al.
patent: 4757488 (1988-07-01), Nagai et al.

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