Servo control system for optical disk device

Details Servo control system for optical disk device Servo control system for optical disk device

1990-05-22

1992-03-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369 4435, 369 4427, G11B 709, G11B 700

Patent

active

050974580

ABSTRACT:
A servo control system for an optical disk device which comprises a unit for scanning an optical disk by an optical spot converged and irradiated on the disk; a unit for feed back controlling position of the optical spot in a focussing direction; and a unit for feed back controlling position of the optical spot in a tracking direction. The system further comprises: a first and second optical detectors, each being divided to at least two detection areas; a multiplexer to which the detection areas are connected for time sharing the detection signals; an adder for adding up the detection signals output from one of the detectors; an A/D converter which converts the time shared signal output from the multiplexer to a digital signal using the added up signal as a reference thereof; and a logic circuit which is connected to the A/D converter and calculates from the digital signal output from the A/D converter to obtain digital error signals of focus and track.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 4775966 (1988-10-01), Miura et al.
patent: 4918676 (1990-04-01), Miyasaka
patent: 4918680 (1990-04-01), Miyasaka
patent: 5003524 (1991-03-01), Ikeda

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