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. 12, 2008
Filed:
May. 31, 2005
Satoshi DO, Asaka-shi, Saitama 351-0031, JP;
Satoshi Do, Asaka-shi, Saitama 351-0031, JP;
Milestone Co., Ltd., Tokyo, JP;
Other;
Abstract
In an imaging lens of the present invention, various types of aberration are corrected favorably, the optical length is short, and a sufficient back focus is secured. The imaging lens comprises an aperture diaphragm S, a first lens L, a second lens L, and a third lens L, and is constituted such that the aperture diaphragm, first lens, second lens, and third lens are arranged in succession from the object side toward the image side. The first lens has a positive refractive power and convex surfaces facing the object side and the image side. The second lens has a negative refractive power, a meniscus shape, and a convex surface facing the image side. The third lens Lhas a positive refractive power and convex surfaces facing the object side and the image side. Both surfaces of the first lens, both surfaces of the second lens, and both surfaces of the third lens Lare aspherical.