US 12,436,364 B2
Imaging system lens assembly, image capturing unit and electronic device
Kuan-Ting Yeh, Taichung (TW); and Cheng-Yu Tsai, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Nov. 25, 2022, as Appl. No. 17/994,237.
Claims priority of application No. 111139030 (TW), filed on Oct. 14, 2022.
Prior Publication US 2024/0126045 A1, Apr. 18, 2024
Int. Cl. G02B 9/58 (2006.01); G02B 1/04 (2006.01)
CPC G02B 9/58 (2013.01) [G02B 1/041 (2013.01)] 26 Claims
OG exemplary drawing
 
1. An imaging system lens assembly comprising four lens elements, the four 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 and a fourth lens element, and each of the four 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 first lens element is convex in a paraxial region thereof, the second lens element has positive refractive power, and the object-side surface of the third lens element is convex in a paraxial region thereof;
wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the image-side surface of the fourth lens element and an image surface is BL, an f-number of the imaging system lens assembly is Fno, an Abbe number of the first lens element is V1, a refractive index of the first lens element is N1, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, 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 fourth lens element is R8, and the following conditions are satisfied:
0<TD/BL<0.42;
1.0<Fno<4.0;
22.0<V1/N1<40.5; and
0<(|R5|+|R6|)/(|R7|+|R8|)<1.2.