Patent ID: 8385008

Claim:
An optical lens system with a wide field of view comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element; a third lens element; a fourth lens element having a concave object-side surface and a convex image-side surface; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; a seventh lens element, at least one of an object-side and an image-side surfaces of the seventh lens element being aspheric; wherein there are seven lens elements with refractive power and a stop in the optical lens system; wherein a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, a focal length of the optical lens system with a wide field of view is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, a sum of absolute value of the refractive power is SUM|pow|(SUM|pow|=|f/f1|+|f/f2|+|f/f3|+|f/f4|+|f/f5|+|f/f6|+|f/f7|), a distance from the stop to an image plane along an optical axis is SL, a distance from the object-side surface of the first lens element to the image plane along the optical axis is TTL, and they satisfy the relations: −0.7<( R 11 +R 12)/( R 11 −R 12)<0.7; SUM|pow|<2.5; 0.15 <SL/TTL< 0.40.