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:
Jun. 16, 1998
Filed:
Sep. 08, 1997
Hisatoshi Baba, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information recording and/or reproducing apparatus includes an optical head for irradiating an optical information recording medium having a plurality of information tracks with a light beam, a photosensor which detects light received via the optical information recording medium and is split into a plurality of sections, and signal generating device for generating a focusing error signal, a tracking error signal, and a sum signal as a sum total of outputs from the split sections of the photosensor on the basis of outputs from the photosensor. In the apparatus, a correction signal is generated such that the phase and amplitude of the correction signal match a phase and an amplitude of crosstalk components included in the focusing error signal on the basis of the tracking error signal and the sum signal obtained when the light beam crosses the information tracks. The correction signal is applied to a focusing servo loop so as to cancel the crosswalk components included in the focusing error signal.