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:
Aug. 09, 2011
Filed:
May. 15, 2009
Applicants:
Toshiaki Katsuma, Saitama, JP;
Masao Mori, Saitama, JP;
Tetsuya Ori, Saitama, JP;
Yu Kitahara, Saitama, JP;
Inventors:
Toshiaki Katsuma, Saitama, JP;
Masao Mori, Saitama, JP;
Tetsuya Ori, Saitama, JP;
Yu Kitahara, Saitama, JP;
Assignee:
Fujinon Corporation, Saitama-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 3/02 (2006.01); G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An objective lens for converging light emitted from a light source on an optical recording medium to record and reproduce information consists of a single lens having at least one aspheric surface. The following conditional expressions (1) to (3) are satisfied:≦1.75  (1)0.5<<0.6  (2)0.8</()<1.0  (3)where