Patent ID: 9733452
Date: 2017-08-15
CPC Classifications: G02B

Claim:
1. An optical lens system with a wide field of view, in order from an object side to an image side, comprising: a stop; a first lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the first lens element being aspheric; a second lens element with a negative refractive power having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric; and a third lens element with a positive refractive power having an object-side surface being convex near the optical axis and an image-side surface being concave near the optical axis, at least one of the object-side surface and the image-side surface of the third lens element being aspheric and provided with at least one inflection point; wherein a focal length of the first lens element and the second lens element combined is f12, 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 central thickness of the first lens element along the optical axis is CT1, a central thickness of the second lens element along the optical axis is CT2, and they satisfy the relations: