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. 01, 1998
Filed:
Jun. 06, 1996
Yoshihiro Saga, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information recording/reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a recording medium having a plurality of tracks, by using a light beam. The apparatus includes an objective lens for irradiating the recording medium with the light beam, a spring support member for supporting the objective lens for movement in a direction transverse to the tracks of the recording medium, a drive mechanism for driving the objective lens, a tracking error detector for detecting a deviation of the light beam relative to a track and for generating a tracking error signal, a servo control circuit for servo-controlling the objective lens on the basis of the tracking error signal, a seek circuit for effecting a seek operation of the light beam to a desired track while the servo control is in an OFF state and an offset circuit for supplying the drive mechanism, during the seek operation, with an offset to cancel a force applied to the objective lens due to a spring force of the spring support member relative to the desired track.