Patent ID: 8493671

Claim:
A three-piece optical lens system comprising, in order from an object side to an image side: a first lens element with a positive refractive power having a convex object-side surface, at least one of the object-side and an image-side surfaces of the first lens element being aspheric; a stop; a second lens element with a positive refractive power having a concave object-side surface, at least one of the object-side and an image-side surfaces of the second lens element being aspheric; a third lens element with a negative refractive power having a concave image-side surface, at least one of an object-side and the image-side surfaces of the third lens element being aspheric; wherein a refractive index of the third lens element is N 3 , an Abbe number of the third lens element is V 3 , a focal length of the second lens element is f2, a focal length of the third lens element is f3, and they satisfy the relations: N3>1.6; V3<30; 0.3< |f 2|/| f 3|<1.0.