Patent ID: 9383556
Filing Date: 2016-07-05
CPC Classification: G02B,H04N

Claim Text:
1. An optical lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element having an image-side surface being convex in a paraxial region thereof; a third lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, both of the object-side surface and the image-side surface of the third lens element being aspheric; and a fourth lens element having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof, both of the object-side surface and the image-side surface of the fourth lens element being aspheric; wherein the optical lens system has a total of four non-cemented lens elements 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 curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, and the following conditions are satisfied: