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:
Jan. 30, 2007
Filed:
Jul. 03, 2002
Applicants:
Fumisada Maeda, Tokyo, JP;
Shinichi Nagashima, Tokyo, JP;
Inventors:
Fumisada Maeda, Tokyo, JP;
Shinichi Nagashima, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 7/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An objective lens unit used for an optical pickup device is made up of a plurality of lenses and has a numerical aperture (NA) not less than 0.7. The lenses () and () are secured within a cylindrically-shaped lens holder (). The position of the lens(es) () other than one of the lenses secured within the lens holder is set with the position of the one lens () as reference.