Patent ID: 8228622

Claim:
An optical lens system for taking image comprising, in order from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power; a fourth lens element with negative refractive power having a concave image-side surface; and in the optical lens system for taking image, the number of lens elements with refractive power being limited to four; wherein a focal length of the optical lens system for taking image is f, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, and they satisfy the relations: 0.45 <f/f 3<0.82; 0.50 <|f/f 4|<1.50.