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. 27, 2005
Filed:
Oct. 07, 2003
Kazuma Aiki, Tokyo, JP;
Kazuma Aiki, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical pickup and disk drive apparatus has a light-emitting device () having a first light emitter () and a second light emitter () for emitting a first laser beam and a second laser beam, respectively, a light splitter (), a collimator lens () for converting the first laser beam and the second laser beam into a parallel beam, and a light-detecting device (). The first laser beam has an optical axis aligned with the optical axis of an objective lens (), and the second laser beam has an optical axis displaced off the optical axis of the objective lens. The second light emitter is placed in a position where the angle α of incidence of the second laser beam on the light splitter is greater than the angle θ of incidence of the first laser beam on the light splitter, for thereby reducing the amount of generated aberrations for increased performance.