Imaging lens system, image capturing unit and electronic device

摘要

An imaging lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element with refractive power has an image-side surface being concave in a paraxial region thereof. The fourth lens element has refractive power. The fifth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The sixth lens element with negative refractive power has 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.

主权项

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 R9, a curvature radius of an image-side surface of the fifth lens element is R10, a central thickness of the fifth lens element is CT5, a central thickness of the sixth lens element is CT6, an axial distance between the fifth lens element and the sixth lens element is T56, 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:
(R9+R10)/(R9−R10)<0.80;1.35