Patent ID: 8724239

Claim:
An optical lens system for image taking comprising, in order from an object side to an image side: a first lens element with negative refractive power comprising a concave object-side surface and a concave image-side surface; a second lens element with positive refractive power comprising a convex image-side surface; and a third lens element with negative refractive power comprising an object-side surface, a concave image-side surface near an optical axis and a convex image-side surface away from the optical axis, both the object-side surface and the image-side surface being aspheric, and the third lens element being made of plastic; the optical lens system for image taking satisfying the following condition: 0 <T 23 /T 12 <0.35; and 0<( R 5 +R 6 )/( R 5 −R 6 )<4.0; wherein T 12 is the axial distance between the first lens element and the second lens element, T 23 is the axial distance between the second lens element and the third lens element, R 5 is the curvature radius of the object-side surface of the third lens element, and R 6 is the curvature radius of the image-side surface of the third element.