Patent ID: 9395519
Filing Date: 2016-07-19
CPC Classification: G02B

Claim Text:
1. An imaging 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 positive refractive power; a third lens element with refractive power having an image-side surface being concave in a paraxial region thereof; a fourth lens element having refractive power; a fifth lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; and a sixth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has 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, an air gap in a paraxial region is between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other; wherein a curvature radius of the object-side surface of the fifth lens element is R