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:
Oct. 07, 1997
Filed:
Aug. 15, 1995
Tsukasa Ogino, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information recording/reproducing apparatus includes an optical system, a moving device for moving a light beam in a direction to cross tracks on a recording medium by moving the optical system, and a tracking error signal detector for detecting a tracking error signal indicating a tracking error of the light beam. In the apparatus, a time interval that the tracking error assumes a predetermined value is detected. A current velocity of the optical system is obtained every time point that the tracking error assumes the predetermined value on the basis of the measured time interval and a moving distance of the optical system corresponding to the time interval. A target velocity value of the optical system is generated at the next occurrence timing of the predetermined value of the tracking error signal upon detection of the current velocity value. An acceleration value of the optical system is generated using the current velocity value and the target velocity value. The moving device is controlled on the basis of the acceleration value.