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:
Jan. 27, 1998
Filed:
Apr. 15, 1997
Jun Akiyama, Kashihara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An optical disk driving apparatus projects an optical beam onto a certain track on an optical disk and forms a light spot thereon. In an access operation onto an adjacent track, the light spot makes a 3-track jump from the position P1 onto the position P2, then a 2-track jump in the opposite direction onto the position P3. With such an arrangement, since the light spot moves by at least 2 tracks even in an access operation onto an adjacent track, it is possible to detect a zero crossing in a tracking error signal. Therefore, it is enabled to steadily adjust the speed of the movement of an objective lens based on the zero crossing. In consequence, a stable access to an information recording medium can be realized with an inexpensive arrangement.