Patent ID: 9411133
Filing Date: 2016-08-09
CPC Classification: G02B

Claim Text:
1. An imaging lens system, including, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with refractive power having an object-side surface and an image-side surface thereof being aspheric; and a fifth lens element with refractive power having a convex object-side surface, the object-side surface and an image-side surface thereof both being aspheric, and at least one of the object-side surface and the image-side surface being provided with at least one inflection point; wherein the imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and the first lens element; wherein the imaging lens system has a total of five lens elements with refractive power; wherein an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, a focal length of the imaging lens system 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 fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following conditions are satisfied: