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:
Feb. 18, 2014
Filed:
Aug. 25, 2010
Keiji Matsusaka, Osaka, JP;
Taizo Wakimura, Kishiwada, JP;
Masashi Isono, Yao, JP;
Eigo Sano, Hino, JP;
Keiko Yamada, Sakai, JP;
Hiroaki Tanaka, Sakai, JP;
Keiji Matsusaka, Osaka, JP;
Taizo Wakimura, Kishiwada, JP;
Masashi Isono, Yao, JP;
Eigo Sano, Hino, JP;
Keiko Yamada, Sakai, JP;
Hiroaki Tanaka, Sakai, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
Provided is a single-focus optical system which is configured, in order from the object side to the image side, of a first to third lens groups and in which the first lens group and the third lens group are fixed with respect to a predetermined imaging surface, and the second lens group is moved in the optical axis direction to focus, wherein the first lens group comprises at least one positive lens and at least one negative lens, the second lens group comprises at least one positive lens, the third lens group comprises at least one lens having at least one aspheric surface and having a positive optical power at a peripheral portion thereof and 5<|Δv1|<70 is satisfied where Δv1 is a maximum value of the Abbe number difference between the positive lens and the negative lens in the first lens group.