Patent ID: 9261674
Filing Date: 2016-02-16
CPC Classification: G02B

Claim Text:
1. A wide-angle imaging lens composed of a first lens having a negative meniscus shape with a convex surface on the object side, a negative second lens, a positive third lens, an aperture stop, a negative fourth lens, and a positive fifth lens disposed in order from the object side, wherein the fourth lens and the fifth lens are cemented with an interface which is convex on the object side and has an aspherical shape, wherein the third lens has a biconvex shape, wherein the fourth lens has a meniscus shape, wherein the fifth lens has a biconvex shape, and the imaging lens satisfies a conditional expressions given below. where: f2: the focal length of the second lens f: the focal length of the entire system Nd1: the refractive index of the material of the first lens with respect to the d-line νd1: the Abbe number of the material of the first lens with respect to the d-line D2: the distance between the first lens and the second lens on the optical axis.