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:
Sep. 11, 2012
Filed:
Dec. 12, 2008
Minoru Ando, Saitama, JP;
Takahiro Mitsuhashi, Saitama, JP;
Minoru Ando, Saitama, JP;
Takahiro Mitsuhashi, Saitama, JP;
Tamron Co., Ltd., Saitama-shi, JP;
Abstract
An imaging lens includes, sequentially from an object side, a first lens (L) configured by a negative meniscus lens disposed with the convex surface on the object side; a second lens (L) configured by a positive biconvex lens; a negative third lens (L); and a fourth lens group (L) configured by a positive meniscus lens disposed with the convex surface on the image plane IMG side. By satisfying given conditions, the imaging lens is able to control ghosting occurring between the last lens surface and the imaging element and ghosting caused by light reflected by the lens surface nearest the object, without sacrifice to the compact-size of the optical system or high optical performance.