Patent ID: 9588321
Date: 2017-03-07
CPC Classifications: G02B

Claim:
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; a second lens element having positive refractive power; a third lens element having an object-side surface being convex; a fourth lens element with positive refractive power having an object-side surface being convex; a fifth lens element having an object-side surface being convex; and a sixth lens element 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 an object-side surface and the image-side surface of the sixth lens element are both aspheric; wherein the imaging lens system has a total of six lens elements, 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, and an axial distance between the first lens element and the second lens element is larger than an axial distance between the fifth lens element and the sixth lens element; wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, an axial distance between the object-side surface of the first lens element and an image surface is TTL, a maximum image height of the imaging lens system is ImgH, and the following conditions are satisfied: