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:
Mar. 22, 2011
Filed:
Oct. 28, 2009
Yu Kitahara, Saitama, JP;
Yoko Yamamoto, Saitama, JP;
Taro Asami, Saitama, JP;
Fujinon Corporation, Saitama, JP;
Abstract
An imaging lens includes, in order from an object side, a first lens having a negative power and including a concave image-side surface, a second lens having a positive power, a stop, a third negative lens, which is a biconcave lens, a fourth lens having a positive power, and a fifth lens having a positive power and including a convex image-side surface. The imaging lens satisfies the following conditional expressions:0.18<(4+5)/<0.44, and0.18<1/where f denotes a focal length of an entire lens system, Ddenotes a thickness of a center of the first lens, Ddenotes a distance from an image-side surface of the second lens to the stop on an optical axis, and Ddenotes a distance from the stop to an object-side surface of the third lens on the optical axis.