The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1999
Filed:
Dec. 11, 1996
Syozo Takegawa, Daito, JP;
Funai Electric Co., Ltd., Osaka, JP;
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
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile