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:
Oct. 29, 2013
Filed:
Aug. 06, 2012
Shoichi Takemoto, Utsunomiya, JP;
Masao Hori, Utsunomiya, JP;
Kazuya Shimomura, Utsunomiya, JP;
Yotaro Sanjo, Utsunomiya, JP;
Shoichi Takemoto, Utsunomiya, JP;
Masao Hori, Utsunomiya, JP;
Kazuya Shimomura, Utsunomiya, JP;
Yotaro Sanjo, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A wide-angle converter lens capable of being detachably mounted on an enlargement side of an imaging lens includes a first optical element, at least one optical element having negative refractive power, and at least one optical element having positive refractive power, wherein, when an average value of relative partial dispersions of the first optical element and all optical elements of which the sign of refractive power is the same as that of the first optical element is denoted by θgF_ave, a relative partial dispersion of the first optical element is denoted by θgF, and an Abbe number of the first optical element is denoted by νd, these numerical values satisfy appropriate relationships.