Track jump control apparatus

Details Track jump control apparatus Track jump control apparatus

1990-11-05

1992-11-03

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 360 7807, G11B 2112

Patent

active

051611406

ABSTRACT:
A track jump control device by means of which a scanning head for scanning the recording track of the disc-shaped recording medium is moved to a target track position is disclosed. A signal obtained by differentiating a tracking error signal is used as speed data to perform a closed loop track jump control operation to achieve direct landing on the target track positively even under an environment highly susceptive to disturbances. The track jump control making use of the gray code information indicating the recording tracks on the disc-shaped recording medium on the track-by-track basis is switched to the track jump control making use of the differentiated tracking error signal or vice versa to realize direct landing on the target track quickly and positively by a simplified arrangement.

REFERENCES:
patent: 4481613 (1984-11-01), Yokota
patent: 4659972 (1987-04-01), Uchikoshi et al.
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 4839876 (1989-06-01), Fennema
patent: 4853918 (1989-08-01), Kobyashi et al.
patent: 4931889 (1990-06-01), Osafune
patent: 5036506 (1991-07-01), Bierhoff
patent: 5063545 (1991-11-01), Nishida
Patent Abstracts of Japan vol. 12, No. 86 (P-677)(2933) Mar. 18, 1988 & JP-A-62 219377 (Mitsubishi) Sep. 26, 1987.

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