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:
Nov. 18, 2014
Filed:
May. 02, 2013
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Hideki Sakai, Sakura, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/08 (2006.01); G02B 13/18 (2006.01); G03B 9/06 (2006.01); G03B 9/02 (2006.01); G02B 15/20 (2006.01);
U.S. Cl.
CPC ...
G03B 9/06 (2013.01); G02B 13/18 (2013.01); G03B 9/02 (2013.01); G02B 15/20 (2013.01);
Abstract
An optical system includes an aperture diaphragm having such a curved surface shape that an aperture part moves in an optical axis direction as an aperture diameter changes. The aperture diaphragm has a convex shape on an object side when an optical system on the object side of the aperture diaphragm has a negative refractive power, and the aperture diaphragm has a convex shape on an image side when the optical system on the object side of the aperture diaphragm has a positive refractive power.