Control system for optical information reproducing apparatus

Details Control system for optical information reproducing apparatus Control system for optical information reproducing apparatus

1986-12-23

1988-11-08

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369 50, 318599, G11B 1924, G11B 700

Patent

active

047837748

ABSTRACT:
A control system for an optical disc information reproducing apparatus in which information data stored in an optical disc is read out during a rotation of the optical disc by a light spot of a light beam. The system includes a laser device for generating the light beam, a device such a turntable for rotatably supporting the optical disc or a pickup device for relatively moving the optical disc and the light spot of the light beam, a photoelectric transducer responsive to the light beam reflected from the optical disc for reproducing the information data from the optical disc during the rotation of the optical disc, the photoelectric transducer producing an electrical signal corresponding to the information data, a circuit for deriving a servo control signal from the reproduced signal, a circuit for modulating the servo control signal to a pulse width modulation (PWM) signal, a device such a turntable drive motor or a pickup transfer motor responsive to the PWM signal for driving the turntable or the pickup device, a circuit for producing a response control signal, and a drive circuit for applying the turntable motor or the pickup transfer motor with a power supply voltage which is changeable in response to the response control signal.

REFERENCES:
patent: 4402070 (1983-08-01), Sugiyama et al.
patent: 4470078 (1984-09-01), Hirata et al.
patent: 4599545 (1986-07-01), Monki et al.
patent: 4613799 (1986-09-01), Sumi
patent: 4646280 (1987-02-01), Toyosawa

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