Patent ID: 8526115
Filing Date: 2013-09-03
Classification: G02B

Abstract:
1. An imaging lens system including, in order from an object side to an image side: a first lens group with negative refractive power comprising a single first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens group with positive refractive power comprising, in order from the object side to the image side: a third lens group with positive refractive power comprising a single fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; wherein by moving the first lens group and the second lens group along an optical axis while keeping the third lens group stationary, the zooming operation is performed such that the system switches between a wide-angle mode and a telephoto mode; wherein all the lens elements in the second lens group are made of plastic material and the object-side and image-side surfaces thereof are aspheric; and wherein the number of the lens elements with refractive power is N, and it satisfies the relation: 5≦N≦6.