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. 16, 2019
Filed:
Sep. 18, 2017
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Shunji Iwamoto, Utsunomiya, JP;
Shinichiro Saito, Utsunomiya, JP;
Satoshi Maetaki, Utsunomiya, JP;
Takahiro Hatada, Utsunomiya, JP;
Suguru Inoue, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/163 (2006.01); G02B 9/62 (2006.01); C03C 3/097 (2006.01); G02B 27/00 (2006.01);
U.S. Cl.
CPC ...
G02B 15/163 (2013.01); C03C 3/097 (2013.01); G02B 9/62 (2013.01); G02B 27/0025 (2013.01);
Abstract
A conversion lens having a negative refractive power includes a positive lens GP. The positive lens GP satisfies all the following conditional expressions:30≤ν≤40,1.225≤[−(14.387/ν)]≤1.276, and0.4300≤[θ−(2.9795/ν)]≤0.5010,where νd is an Abbe number of the positive lens GP, θgF is a partial dispersion ratio of the positive lens GP for g-line and F-line, and nd is a refractive index of the positive lens GP for d-line.