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:
Jul. 06, 2004
Filed:
Jun. 23, 2000
Tomohiko Baba, Chiba, JP;
Katsutoshi Sato, Tokyo, JP;
Satoshi Nakano, Tokyo, JP;
Satoshi Imai, Tokyo, JP;
Hiroaki Yukawa, Tokyo, JP;
Sony Corporation, , JP;
Abstract
The disclosed invention relates to an optical integrated device, an optical pickup, and an optical disk apparatus, and is applicable to an optical disk apparatus for playing back a compact disk (CD) and a DVD (Digital Video Disk), thereby to access a plurality of types of optical disks with a simple arrangement. For dividing feedback light with a hologram A and detecting the divided feedback light with a light-detecting element , laser sources A, B having different wavelengths are spaced a predetermined distance D from each other in order to compensate for the difference between the diffraction angles &thgr;A , &thgr;B of the hologram A.