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:
Jan. 20, 2009
Filed:
May. 24, 2007
Kenichi Sato, Saitama, JP;
Minoru Taniyama, Saitama, JP;
Kenichi Sato, Saitama, JP;
Minoru Taniyama, Saitama, JP;
Fujinon Corporation, Saitama, JP;
Abstract
There is provided an imaging lens including a first lens having a positive refracting power, a second lens having a concave surface on an object side and having a negative refracting power, and a third lens having a positive refractive power and a meniscus shape having a convex surface on the object side and at a vicinity of an optical axis, in order from the object side. The imaging lens satisfies conditional equations below. f designates a focal length of the total system, fdesignates a focal length of the first lens, Ddesignates an interval between the first lens and a second lens on an optical axis, νdesignates an average of Abbe numbers of the first lens, the second lens and the third lens, and νdesignates the Abbe number of the second lens.0.7<1/<1.3  (1)0.25<2/<0.50  (2)55<ν123  (3)|ν123−ν2|<5  (4)