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. 26, 2011
Filed:
Dec. 06, 2007
Applicants:
Kazunari Tada, Hachioji, JP;
Youichi Ogawa, Sakai, JP;
Nobuo Mushiake, Osaka, JP;
Kazuyuki Nishi, Sakai, JP;
Inventors:
Kazunari Tada, Hachioji, JP;
Youichi Ogawa, Sakai, JP;
Nobuo Mushiake, Osaka, JP;
Kazuyuki Nishi, Sakai, JP;
Assignee:
Konica Minolta Opto, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An objective lens causes birefringence, which causes wave aberration in outgoing light from the objective lens. A coated objective lens has a dielectric multilayer film that can reduce astigmatism component of the wave aberration to 5 mλ rms or smaller when 10 mλ rms or larger astigmatism component of wave aberration is generated.