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:
Sep. 14, 1999
Filed:
May. 30, 1996
Hisatoshi Baba, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information recording/reproducing apparatus for recording and/or reproducing information on or from both a land portion and a groove portion of a recording medium using a light beam includes a focus servo for adjusting a focus state of the light beam, and a tracking servo for adjusting a tracking state of the light beam. Parameters of the tracking servo and focusing servo are checked in state in which the light beam is being traced on the land portion and in a state in which the light beam is being traced on the groove portion, respectively. The focus servo and/or the tracking servo adjusts the focus state and/or tracking state of the light beam on the basis of the parameters.