Patent ID: 8400717

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; a second lens element with negative refractive power having a concave image-side surface, and an object-side surface of the second lens element being cemented to an image-side surface of the first lens element; a third plastic lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric; a fourth plastic lens element with negative refractive power having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces of the fourth lens element being formed with at least one inflection point; and an aperture stop being located between an object to be photographed and the first lens element; in the optical lens system for taking image, the number of the lens elements with refractive power being limited to four; a focal length of the optical lens system for taking image is f, a focal length of the first lens element and the second lens element combined is f12, and they satisfy the relation: 0.6 <f/f 12<1.3; an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the relation: 25 <V 1 −V 2<33; the object to be photographed is imaged on an electronic imaging sensor, a total track length of the optical lens system for taking image is TTL, a maximum image height of the optical lens system for taking image is ImgH, and they satisfy the relation: 1.9 <TTL/ImgH< 2.15.