Method and apparatus for accessing track on an optical disc

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

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369 32, G11B 700

Patent

active

058751610

ABSTRACT:
A method for accessing track on an optical disc, comprising steps of implementing a preliminary track jump by a light pickup of a certain number of tracks from a present block on the optical disc; reading track information of the track to which the light pickup is jumped by the initial step; calculating an actual linear velocity of the optical disc on the basis of the track information obtained in the reading step; and then calculating a correcting coefficient by using the actual linear velocity obtained by the first calculating step; and establishing for the light pickup a number of corrected tracks to be jumped up to a destination block by using the correcting coefficient obtained in the second calculating step; wherein a track jump of light pickup is performed according to the number of corrected tracks established in the last step. The invention also comprises an apparatus for accessing rack on an optical disc, comprising a preliminary track jump for jumping a light pickup till a certain number of tracks from a present block on the optical disc; a reading device for reading track information of the track to which the light pickup is preliminarily jumped; a first calculation device for calculating an actual linear velocity of the optical disc on the basis of the track information; a second calculation device for calculating a correcting coefficient by using the actual linear velocity; an establishing device for establishing for the light pickup a number of corrected tracks to be jumped up to a destination block by using the correcting coefficient; and a jumping device for jumping the light pickup according to the number of corrected tracks

REFERENCES:
patent: 4774699 (1988-09-01), Giddings
patent: 5163033 (1992-11-01), Yanagi
patent: 5182736 (1993-01-01), Yanagi
patent: 5216647 (1993-06-01), Kitani
patent: 5222054 (1993-06-01), Muraoka et al.
patent: 5428590 (1995-06-01), Ogino

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