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. 17, 2012
Filed:
May. 01, 2009
Applicant:
Yumiko Ohsaki, Utsunomiya, JP;
Inventor:
Yumiko Ohsaki, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 27/52 (2006.01); G03B 27/72 (2006.01);
U.S. Cl.
CPC ...
Abstract
A measuring apparatus for measuring an optical performance of an optical system under test that has a numerical aperture of more than 0.6 at a light exit side, said measuring apparatus includes a numerical aperture decreasing part for decreasing the numerical aperture of a light exited from the optical system under test to 0.6 or less, and a detector for detecting an interference fringes formed by the light that passes through the numerical aperture decreasing part.