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:
Mar. 26, 2013
Filed:
Jul. 21, 2009
Kiyono Tateyama, Hino, JP;
Kentarou Nakamura, Tokyo, JP;
Kiyono Tateyama, Hino, JP;
Kentarou Nakamura, Tokyo, JP;
Konica Minolta Optp, Inc., Tokyo, JP;
Abstract
Provided are an objective lens with enhanced transmittance and an optical pickup apparatus which can record and/or reproduce information properly for three kinds of discs with different recording densities, even if a single lens is used as the objective lens. When all the expressions (1) to (3) are satisfied, excellent aberration characteristics can be obtained for the three kinds of discs: −0.02≦m≦0.02 (1); 0≦(WD−WD)≦1.57 m+0.123 or 1.57 m+0.24≦(WD−WD)≦0.7 (2); and 0≦(WD−WD)≦1.79 m+0.333 or 1.66 m+0.508≦(WD−WD)≦0.7 (3).