Optical head seek controller for optical disk device

Details Optical head seek controller for optical disk device Optical head seek controller for optical disk device

1997-08-12

1998-07-28

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4434, 369 4437, G11B 700

Patent

active

057870594

ABSTRACT:
The optical head seek controller disclosed has an optical head for producing three beam spots on an optical disk and receiving three beam spots reflected therefrom, a matrix circuit for processing data contained in the three beam spots formed on the optical head to generate and output a predetermined track error signal when accessing a track, and a controller for controlling the movement of the optical head to a desired track position by calculating a relative position and a speed of the optical head according to the predetermined track error signal from the matrix circuit. The matrix circuit comprises a first track error signal generator for generating a first track error signal for track accessing on the optical disk, and a second track error signal generator for generating a second track error signal necessary for the relative position and the speed of the optical head with respect to the optical disk. The second track error signal generator has a function of generating the second track error signal by a push-pull process according to data concerning the main beam spot as the central one of the three beam spots. The arrangement enables the fast and accurate movement operation.

REFERENCES:
patent: 5148424 (1992-09-01), Wahci
patent: 5168487 (1992-12-01), Ohsato et al.

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