Optical information reading apparatus with tracking adjustment s

Details Optical information reading apparatus with tracking adjustment s Optical information reading apparatus with tracking adjustment s

1988-09-30

1991-06-25

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, G11B 700

Patent

active

050273361

ABSTRACT:
Reduction of a number of parts required for servo control in an optical disk reproducing apparatus is achieved by deriving information relating to errors caused by warp or tilt of an optical disk from other error signals produced by other servo devices within the apparatus. A beam spot used to irradiate a disk surface is oscillated, and a frequency and amplitude component arising from this oscillation is extracted from the output of a light detector. The information provided by the frequency and amplitude may be used to compensate for tilt and warp, even though the detected signals are used for tracking and focusing servo devices in the optical disk apparatus. The technique is applicable to various types of discrete producing approaches, including a push-pull, a heterodyne system, and a three-beam system.

REFERENCES:
patent: 4397010 (1983-08-01), Nabeshima
patent: 4466087 (1984-08-01), Cheng
patent: 4482989 (1984-11-01), Bierhoff
patent: 4488276 (1984-12-01), Tanaka et al.
patent: 4748609 (1988-05-01), Yonezawa et al.
Patent Abstracts of Japan, vol. 6, No. 156 (P-135) (1034), Aug. 17, 1982.
European Search Report, EP 88 11 5610, May 11, 1989, by Examiner F. M. Cleary.

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