Tracking servocontrol circuits for reducing gain to avoid tracki

Details Tracking servocontrol circuits for reducing gain to avoid tracki Tracking servocontrol circuits for reducing gain to avoid tracki

1983-11-10

1986-05-06

Cardillo, Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369 54, 369 58, G11B 7095, G11B 2110

Patent

active

045876444

ABSTRACT:
A tracking servocontrol circuit for use in an optical reproducing apparatus comprises a signal generator for generating a tracking error signal representing a tracking error in respect of a light beam scanning the record track on a record medium from which a reproduced information signal is obtained. A servocontrol amplifier is supplied with the tracking error signal and produces a drive signal in response to the tracking error signal. The drive signal is supplied to a driving device for tracking servocontrol. A defect detector detects a variation in the reproduced information signal resulting from a defect on the recorded surface of the record medium, and a control circuit reduces the gain of the servocontrol amplifier when a predetermined detection output is obtained from the defect detector. This prevents the drive signal supplied to the driving device from being harmfully affected by the defect on the recorded surface of the record medium.

REFERENCES:
patent: 4344165 (1982-08-01), Akiyama
patent: 4406000 (1983-09-01), Shoji et al.
patent: 4414655 (1983-11-01), Shoji et al.
patent: 4475182 (1984-10-01), Hosaka
patent: 4506149 (1985-03-01), Utsumi
IBM Technical Disclosure Bulletin, vol. 21, No. 10, 3/1979, p. 4195.
IBM Technical Disclosure Bulletin, vol. 13, No. 11, Apr. 1971, p. 3386.
Patent Abstracts of Japan, vol. 2, No. 37, 3/13/78, p. 102E78.
Patent Abstracts of Japan, vol. 2, No. 129, 10/27/78, p. 7876E78.

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