Patent ID: 7826149

Claim:
An optical lens system for taking image comprising, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; an aperture stop; a plastic second lens element with negative refractive power having an aspheric concave object-side surface and an aspheric image-side surface; a plastic third lens element with positive refractive power having an aspheric concave object-side surface and an aspheric convex image-side surface; and a plastic fourth lens element with negative refractive power having an aspheric concave object-side surface and an aspheric concave image-side surface, inflection points being formed on the image-side surface of the fourth lens element, in the optical lens system for taking image, the number of lens elements with refractive power being limited to four; a distance from the aperture stop to an image plane being SL, a total track length of the optical lens system for taking image being TTL, and they satisfy the relation: SL/TTL< 0.92.