Tracking control unit in information reproducing apparatus

Details Tracking control unit in information reproducing apparatus Tracking control unit in information reproducing apparatus

1986-12-15

1989-02-14

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 250202, G11B 7095

Patent

active

048051632

ABSTRACT:
In reproducing recorded information from a track on an optical disc by the use of a light beam, a tracking servo is employed for enabling the light beam to follow up the track. When there occurs any tracking deviation due to some flaw or the like on the track, the tracking servo is switched off if the number of times of such tracking deviation has exceeded a predetermined value within a preset time, and simultaenously a braking action is executed to impede the movement of the light beam. The braking force is adjustable in accordance with the velocity of the light beam movement.

REFERENCES:
patent: 4067044 (1978-01-01), Maeda
patent: 4138663 (1979-02-01), Lehureau
patent: 4268745 (1981-05-01), Okano
patent: 4365324 (1982-12-01), Michaelis
patent: 4371899 (1983-02-01), Ceshkovsky
patent: 4615023 (1986-09-01), Inada
patent: 4630250 (1986-12-01), Nonomura
patent: 4680594 (1987-07-01), Bracht

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