Patent ID: 9001434
Filing Date: 2015-04-07
Classification: G02B

Abstract:
1. An imaging lens system comprising six non-cemented lens elements with refractive power, in order from an object side to an image side: a first lens element having positive refractive power; a second lens element having refractive power; a third lens element having positive refractive power, a fourth lens element having refractive power; a fifth lens element having refractive power, wherein both of an object-side surface and an image-side surface of the fifth lens element are aspheric; and a sixth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the sixth lens element having at least one convex shape in an off-axis region thereof, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric; wherein the imaging lens system has a total of six lens elements with refractive power, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a central thickness of the first lens element is CT1, and an axial distance between the first lens element and the second lens element is T12, the following relationships are satisfied: