Tracking control system with correction capabilities for correct

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

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369 4432, 369 4434, 369 4435, G11B 7085

Patent

active

055661521

ABSTRACT:
A tracking control system according to the present invention includes an objective lens for converging a light beam at a point on a recording medium to form a converging spot; a galvano-mirror for receiving a driving signal and for moving the converging spot across tracks provided on the recording medium in response to the driving signal; a tracking error detecting section for generating a tracking error signal according to a position of the converging spot with respect to one of the tracks; a tracking servo control section for generating a first driving signal according to the tracking error signal end for feeding the first driving signal to the galvano-mirror as the driving signal, by which the galvano-mirror is driven so that the converging spot is located on the one track; a signal selection circuit for turning on and off the tracking servo control section; a driving section for, when tracking servo control is turned off, generating a second driving signal by which the galvano-mirror is driven so that the converging spot crosses predetermined number of tracks among the tracks; a measuring section for, when the tracking servo control is turned off, measuring a degree of disagreement of optical axes based on the tracking error signal obtained by driving the galvano-mirror with the second driving signal; and a correcting section for correcting the disagreement of optical axes by constantly supplying the galvano-mirror with a current for making the degree of disagreement of optical axes substantially zero based on the measured degree of disagreement of optical axes.

REFERENCES:
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patent: 4773055 (1988-09-01), Gijzen et al.
patent: 4849953 (1989-07-01), Nomura et al.
patent: 5090001 (1992-02-01), Ito et al.
patent: 5117410 (1992-05-01), Akiyama
patent: 5199012 (1993-03-01), Imai
patent: 5241522 (1993-08-01), Yanagi
patent: 5285435 (1994-02-01), Takasago
patent: 5293364 (1994-03-01), Shimonou

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