Patent ID: 7885015

Claim:
A two-lens type optical lens system for taking image comprising two lens elements with refractive power, from the object side to the image side: an aperture stop; a plastic first lens element with positive refractive power having a convex object-side surface and a concave image-side surface, both the object-side surface and the image-side surface of the first lens element being aspheric; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface, both the object-side surface and the image-side surface of the second lens element being aspheric, wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the two-lens type optical lens system is f, a radius of curvature of the object-side surface of the second lens element is R3, and they satisfy the relations: f/f 1>0.9; ( f/f 1)−( f/f 2)>0.35; −0.9 mm −1 <1 /R 3<−0.35 mm −1 ; an object to be photographed is imaged on an electronic photosensitive assembly, a total track length of the system is TL, a maximum image height of the system is ImgH, and they satisfy the relation: TL/ImgH< 2.2 in the two-lens type optical lens system for taking image, the number of the lens elements with refractive power being limited to two.