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. 24, 2001
Filed:
Sep. 26, 1997
Applicant:
Inventors:
Masaharu Fukakusa, Kumamoto-ken, JP;
Taiichi Mori, Fukuoka-ken, JP;
Hiroshi Tanigawa, Kumamoto-ken, JP;
Haruhiko Kono, Kumamoto-ken, JP;
Mikio Tomisaki, Chikushino, JP;
Seigi Ito, Yamaga, JP;
Kazuyuki Nakashima, Fukuoka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
An optical pickup device has a single light beam path in which at least one or either of a plurality of kinds of light beams (different from each other in, for example, wavelength) for respective recording densities and/or recording-medium-thicknesses proceeds toward a surface of an optical recording medium and proceeds to a light beam detector after being reflected by the surface.