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:
Jun. 03, 2003
Filed:
Apr. 19, 2001
Masato Yamada, Inuyama, JP;
Seiji Kajiyama, Ibi-gun, JP;
Yasuyuki Kanou, Hashima, JP;
Yoichi Tsuchiya, Hashima, JP;
Sanyo Electric Co., Ltd, Moriguchi, JP;
Abstract
In an optical pickup device ( ) including a laser light source ( ) and an objective lens ( ), an optical device ( ) is provided that transmits a laser beam of 635 nm in wavelength emitted from a first semiconductor laser ( A) straightforwardly into the objective lens ( ) while maintaining its incident intensity, and that selectively diffracts a laser beam of 780 nm in wavelength emitted from a second semiconductor laser ( B) to a desired direction while maintaining its incident intensity and directs only the predetermined center portion of the laser beam into the objective lens ( ). The optical pickup device ( ) records or reproduces a signal onto or from a plurality of types of optical disks differing in substrate thickness while directing a laser beam of sufficient intensity onto a signal recording plane.