Information recording/reproducing apparatus

Details Information recording/reproducing apparatus Information recording/reproducing apparatus

1989-06-01

1992-02-18

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4429, 369 32, G11B 700

Patent

active

050900013

ABSTRACT:
An information recording/reproducing apparatus includes an optical head for projecting a light spot onto an optical disk, a fine actuator for causing a light spot to track a track of the optical disk, a coarse actuator for moving the light spot over a recording region of the optical disk, a movement detector for detecting a moving distance of the fine actuator and outputting a detection signal, and a driving circuit for adding the output signal from the movement detector and a drive signal for driving the fine actuator and forming a drive signal for driving the coarse actuator on the basis of the sum signal.

REFERENCES:
patent: 4476555 (1984-10-01), Joichi et al.
patent: 4607358 (1986-08-01), Maeda et al.
patent: 4615023 (1986-09-01), Inada et al.
patent: 4707817 (1987-11-01), Yoshio
patent: 4866687 (1989-09-01), Kasai et al.
Y. Ozawa et al.--Theoretical Analysis of Dual Tracking Servo System, Fujitsu Laboratories Ltd., pp. 195-202.

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