Servo apparatus for optical disk player having both open loop co

Details Servo apparatus for optical disk player having both open loop co Servo apparatus for optical disk player having both open loop co

1990-10-04

1992-09-08

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4436, G11B 700

Patent

active

051464438

ABSTRACT:
A servo apparatus for an optical disk player which coarsely adjusts the loop gain in advance in an open state of a servo loop, and then closes the servo loop to finely adjust the loop gain. This ensures accurate and sure gain control even if there are differences between reflection factors of the recording surfaces of disks being played or is a stain or the like on an objective lens of the player.

REFERENCES:
patent: 4475182 (1984-10-01), Hosaka
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 4967404 (1990-10-01), Orlicki et al.
JP-A-63 129 530 Patent Abstracts of Japan vol. 12, No. 338 (p-771) 17 Oct. 1988 (Matsushita Graphic Commun Syst Inc.) 1 Jun. 1988.

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