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:
May. 20, 2014
Filed:
Jan. 30, 2013
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Kaoru Eguchi, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/02 (2006.01); G02B 27/64 (2006.01);
U.S. Cl.
CPC ...
Abstract
An image pickup optical system includes, in order from an object side to an image side, a first lens unit that does not move for focusing and has a positive optical power, a second lens unit that moves during focusing, an aperture diaphragm, and a third lens unit that does not move for focusing. The image pickup optical system includes a diffractive optical element, and an optical element NLF made of a solid material on the object side of an intersection between a paraxial chief ray and an optical axis. The predetermined conditional expressions are satisfied.