Patent ID: 11933947
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 14:
15. An imaging lens system comprising a total of eight lens elements, the eight lens elements being, 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, a sixth lens element, a seventh lens element and an eighth lens element, and each of the eight lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the second lens element has positive refractive power, and at least one of the eight lens elements has at least one lens surface having at least one inflection point;
wherein a central thickness of the fifth lens element is smaller than a central thickness of the sixth lens element, a central thickness of the seventh lens element is smaller than a central thickness of the eighth lens element, and an axial distance between the fourth lens element and the fifth lens element is larger than an axial distance between the third lens element and the fourth lens element;
wherein an axial distance between the image-side surface of the eighth lens element and an image surface is BL, an axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is TD, half of a maximum field of view of the imaging lens system is HFOV, a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the eighth lens element is Y82, a maximum image height of the imaging lens system is ImgH, a focal length of the imaging lens system is f, and the following conditions are satisfied:

0<BL/TD<0.25;

5.0 degrees<HFOV<30.0 degrees; and

0<(|Y11−Y82|+|Y82−ImgH|)/f<0.15.