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:
Aug. 08, 2006
Filed:
Sep. 08, 2000
Takashi Inoue, Yokohama, JP;
Yasuhiro Hayashi, Yokohama, JP;
Satoru Maeda, Kodama-gun, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
Disclosed is a track-search control circuit for performing track-search of an optical disc stably even at the time of multi-speed reproduction of the optical disc. The track search control circuit comprises a circuit for detecting the light beam having traversed the track when the light beam moves in the radial direction of the optical disc and generating a normal direction on-track signal FVACLR at the time of being on the track and a normal direction off-track signal FVBCLR at the time of being off the track, a first measurement circuit that starts time measurement at the time of generating the normal direction on-track signal, a second measurement circuit that starts time measurement at the time of generating the normal direction off-track signal, circuits which detect the error between a moving velocity of the optical beam in the radial direction of the optical disc and a target velocity based on a measurement output by the first measurement circuit and a measurement output by the second measurement circuit, and a correction circuit for correcting the moving velocity of the optical beam in the radial direction based on the detected error signal.