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. 09, 2010
Filed:
Feb. 15, 2008
Kenichi Sato, Saitama, JP;
Minoru Taniyama, Saitama, JP;
Kenichi Sato, Saitama, JP;
Minoru Taniyama, Saitama, JP;
Fujinon Corporation, Saitama-shi, JP;
Abstract
An imaging lens comprises, in order from an object side: a first lens having a positive refractive power and a meniscus shape and having a convex surface directed to the object side; a second lens having a negative refractive power in the vicinity of an optical axis of the imaging lens; and a third lens having a positive refractive power in the vicinity of the optical axis, wherein at least one surface of each of the second lens and the third lens is an aspheric surface; and the imaging lens satisfies the following conditional expression expressions: 0.7 <If/fl <0.8 . . . (1) 0.3<1f/fl <0.8 . . . (2) 7.5 <vd<96 . . .(3) TL/Y <0.9 . . . (4) where f: focal length of the imaging lens; f: focal length of the first lens; f: focal length of the second lens; vd: Abbe number of the first lens for the d-line; TL: length between the object-side surface of the first lens to an image forming position of the imaging lens; and Y: maximum image height.