US 12,481,131 B2
Imaging lens system, image capturing unit and electronic device
Chun-Che Hsueh, Taichung (TW); and Meng-Kuan Cho, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on May 26, 2022, as Appl. No. 17/825,681.
Prior Publication US 2023/0314771 A1, Oct. 5, 2023
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An imaging lens system comprising eight lens elements, the eight lens elements being, in order from an object side to an image side along an optical path, 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 object-side surface of the third lens element is concave in a paraxial region thereof; and the fifth lens element has negative refractive power;
wherein a curvature radius of the object-side surface of the second lens element is R3, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fifth lens element is R10, a central thickness of the third lens element is CT3, a focal length of the imaging lens system is f, a focal length of the fifth lens element is f5, an axial distance between the first lens element and the second lens element is T12, and the following conditions are satisfied:
(R3+R4)/(R3−R4)<0.90;
(R7+R10)/(R7−R10)<0.85;
0.26<CT3/f<2.20;
−1.60<f/f5<0.00;
f/R5<−0.20; and
0.30<T12/f<1.15.