Servo circuit for an optical disk information recording and repr

Details Servo circuit for an optical disk information recording and repr Servo circuit for an optical disk information recording and repr

1987-12-04

1992-01-07

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 58, G11B 7095

Patent

active

050797573

ABSTRACT:
In an optical disk information recording and reproducing apparatus for writing and reading information to and from the optical disk using the optical disk as a record medium on which pre-grooves are formed and address signals are prerecorded on land sections among these pre-grooves presenting physical changes in the form, a servo circuit therein for executing tracking and/or focusing control is disclosed. In the servo circuit, by providing a switch for opening and closing control loops for said tracking and focusing control and by controlling said switch to open during reproduction of the address signals recorded on the address area of the optical disk, servo signals including noise due to pits presenting physical changes in the form on the address area are eliminated so as to establish tracking and/or focusing control. This serves to enable information writing and reading to and from the record area of the optical disk with high reliability and stability.

REFERENCES:
patent: 4023033 (1977-05-01), Bricot et al.
patent: 4512002 (1985-04-01), Kosaka et al.
patent: 4616354 (1986-10-01), Yoshida
patent: 4651314 (1987-03-01), Yoshikawa et al.
patent: 4661942 (1987-04-01), Yoshimoto et al.
patent: 4674076 (1987-06-01), Hsieh et al.
patent: 4707816 (1987-11-01), Yonezawa et al.
Patent Abstracts of Japan, vol. 9, No. 227, (P-388)[1950], 9/13/85, JP-60-85444.

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