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:
Dec. 17, 2002
Filed:
Aug. 01, 2000
Junichi Nakano, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical pickup device comprises a stationary optical system and a movable optical system. The stationary optical system includes a recording/reproducing laser, a collimator for the recording/reproducing laser, a servo laser, a collimator for the servo laser, an actuator for moving the collimator for the servo laser along its optical axis, and a beam coupling/splitting optical element. The movable optical system includes an objective lens and an actuator for moving the objective lens along its optical axis. The point of convergence of recording/reproducing laser light is suitably moved in the layer direction in a recording layer of an optical disk. It is moved in a manner such that the collimator for substantially collimating servo laser light is first moved along its optical axis and the objective lens is then moved along its optical axis to correct defocusing of the servo laser light that is caused by the movement of the collimator for the servo laser light.