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. 02, 2008
Filed:
Aug. 11, 2005
Kenji Nagatomi, Gifu, JP;
Seiji Kajiyama, Gifu, JP;
Kenji Nagatomi, Gifu, JP;
Seiji Kajiyama, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
Provided is an optical pickup device whose optical axis adjustment can be performed while an increase in cost is suppressed and whose optical axis correction can be accurately performed even when a variation in arrangement between laser elements occurs. The optical pickup device includes a semiconductorthat houses at least three laser elements having at least three different emission wavelengths in a single package, and first and second diffraction gratingsandfor substantially matching optical axes of lasers emitted from the laser elements with the optical axis of the reference laser beam by a diffraction effect. The first diffraction gratingmatches an optical axis of a laser beam for CD (780 nm in wavelength) with the reference optical axis by a diffraction effect. The second diffraction gratingmatches an optical axis of a laser beam for DVD (655 nm in wavelength) with the reference optical axis by a diffraction effect. Even when a variation occurs in a light emitting point gap between the laser elements, by performing fine adjustment of the corresponding diffraction grating in the reference optical axis direction, the optical axis of the laser beam can be adjusted.