Beam track position control apparatus for optical disk apparatus

Details Beam track position control apparatus for optical disk apparatus Beam track position control apparatus for optical disk apparatus

1990-03-05

1992-09-22

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, 369 4429, G11B 700

Patent

active

051503476

ABSTRACT:
A beam track position control apparatus for an optical disk apparatus is disclosed. The track positions of first and second beams of light are controlled simultaneously by a track servo control, and the track position of the second beam is controlled independently by a second beam track servo control provided independently of the first-mentioned track servo control. In particular, the first and second beams are controlled simultaneously in response to a track error signal obtained from an output of a first photodetector, and the track position of the second beam is controlled independently in response to another track error signal obtained from an output of a second photodetector thereby to correct the track position of the second beam relative to the track position of the first beam. With this control, the first and second beams can always be positioned on the same track on an optical disk.

REFERENCES:
patent: 4074085 (1978-02-01), Russell
patent: 4571712 (1986-02-01), Romano et al.
patent: 4577301 (1986-03-01), Mathews et al.
patent: 4700336 (1987-10-01), Yoshida et al.
patent: 4975895 (1990-12-01), Yanagi
patent: 4985882 (1991-01-01), Tanaka et al.

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