Method and device for correcting track deviation in optical disc

Details Method and device for correcting track deviation in optical disc Method and device for correcting track deviation in optical disc

1991-09-30

1993-09-14

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4414, 369 4429, 369112, G11B 709

Patent

active

052455971

ABSTRACT:
Disclosed are a method and a device for correcting a track deviation by the deviation of a disc through a fine seek operation that operates a tracking actuator in a coarse seek stage of an optical disc drive wherein a track cross signal of the disc is detected in the optical pick up during the course seek operation and at the same time by using an optical encoder and a linear scale which are installed separately, a scale cross signal of the linear scale is detected and the actuator is driven by a signal resulting from comparing both the signals. At the stage of the travel of the optical pick up, the track deviation of the disk is corrected, and accordingly the relative speed between the light spot and the track at a seek direction becomes small to facilitate the control of the actuator and not to be necessary for lowering a speed of the VCM used in the coarse seek in order to lower the relative speed. The seek time is shortened so that the position control time between the coarse seek and the fine seek is close to zero.

REFERENCES:
patent: 4530083 (1985-07-01), Ishihara
patent: 4797866 (1989-01-01), Yoshikawa
patent: 4974220 (1990-11-01), Harada
patent: 5003524 (1991-03-01), Ikeda
patent: 5063549 (1991-11-01), Yamamuro
patent: 5090002 (1992-02-01), Chow et al.
patent: 5148420 (1992-09-01), Yamamuro

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