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:
Apr. 16, 2013
Filed:
Sep. 17, 2009
Applicants:
Masayuki Shiraishi, Kumagaya, JP;
Takuro Ono, Okegawa, JP;
Inventors:
Masayuki Shiraishi, Kumagaya, JP;
Takuro Ono, Okegawa, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 27/72 (2006.01); G03B 27/54 (2006.01);
U.S. Cl.
CPC ...
Abstract
An aperture diaphragm plate is provided to define a light flux on a pupil plane of an optical system or a plane or surface disposed in the vicinity of the pupil plane. An aperture, which is formed in the aperture diaphragm plate, has a three-dimensional shape corresponding to an optimum pupil shape of the optical system. It is possible to improve the imaging characteristic brought about by the optical system by providing the optimum pupil shape of the optical system.