Patent ID: 8654454

Claim:
A thin optical lens assembly, comprising two lens elements with refractive power arranged sequentially from an object side to an image side along an optical axis: a first lens element with a positive refractive power having an object-side surface and an image-side surface thereof both being convex and aspheric; and a second lens element with a negative refractive power having a concave object-side surface and a convex image-side surface thereof both being aspheric, wherein the second lens element comprises at least one inflection point; wherein the thin optical lens assembly has a total of two lens elements with refractive power, and the first lens element and the second lens element are made of plastic materials; wherein the thin optical lens assembly further comprises an aperture stop; wherein, the second lens element has an Abbe number v 2 and a refractive index N 2 , the thin optical lens assembly has a focal length f, the first lens element has a focal length f 1 , the second lens element has a focal length f 2 , the first lens element has a radius of curvature R 1 on the object-side surface, the first lens element has a radius of curvature R 2 on the image-side surface, the second lens element has a radius of curvature R 3 on the object-side surface, a distance from the aperture stop to the image plane on the optical axis is SL, a distance from the object-side surface of the first lens element to the image plane on the optical axis is TTL, a vertical distance between a maximum-range position where the light passes through the image-side surface of the second lens element to the optical axis is Y 22 , distance between a position Y 22 from the optical axis on the ima e-side surface of the second lens element and a tangential plane through a vertex on the optical axis of the image-side surface of the second lens element is SAG 22 , and the following conditions are satisfied: v 2 <25; N 2 <1.75; −2.0 <f/f 2 −1.27; 0.0<( f/f 1 )+(f/f 2 )<1.2; −7.0 <R 1 / R 2 <−3.5; 1. 2 <R 2 / R 3 <2.5; 0.9 <SL/TTL <1.2; and 0.1 <SAG 22 /Y 22 <0.2.