US 12,332,410 B2
Optical imaging system, image capturing unit and electronic device
Yu-Tai Tseng, Taichung (TW); Meng-Kuan Cho, Taichung (TW); and Hsin-Hsuan Huang, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Jun. 25, 2021, as Appl. No. 17/359,030.
Claims priority of application No. 110103920 (TW), filed on Feb. 3, 2021.
Prior Publication US 2022/0244500 A1, Aug. 4, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An optical imaging system comprising ten lens elements, the ten 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, an eighth lens element, a ninth lens element and a tenth lens element, and each of the ten lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the optical imaging system further comprises an aperture stop, the first lens element has positive refractive power, the second lens element has negative refractive power, the image-side surface of the second lens element is concave in a paraxial region thereof, the fourth lens element has positive refractive power, the image-side surface of the eighth lens element is concave in a paraxial region thereof and has at least one convex shape in an off-axis region thereof, the ninth lens element has positive refractive power, the tenth lens element has negative refractive power, and at least one of the object-side surface and the image-side surface of the tenth lens element has at least one inflection point; and
wherein an axial distance between the aperture stop and the image-side surface of the tenth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the tenth lens element is TD, a curvature radius of the image-side surface of the eighth lens element is R16, a curvature radius of the image-side surface of the ninth lens element is R18, a curvature radius of the object-side surface of the tenth lens element is R19, a focal length of the optical imaging system is f, a focal length of the first lens element is f1, and the following conditions are satisfied:
0.30<SD/TD<1.20;
−5.0<(R18+R19)/(R18−R19)<5.0;
0.15<f/R16<8.0; and
0.20<f/f1<4.0.