US 12,411,312 B2
Optical lens system and time of flight sensing module
Chun-Che Hsueh, Taichung (TW); Jin Sen Wang, Taichung (TW); Hsin-Hsuan Huang, Taichung (TW); and Fuh-Shyang Yang, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Sep. 21, 2021, as Appl. No. 17/480,567.
Claims priority of application No. 110114770 (TW), filed on Apr. 23, 2021.
Prior Publication US 2022/0350114 A1, Nov. 3, 2022
Int. Cl. G02B 13/00 (2006.01); G01S 17/894 (2020.01); G02B 9/06 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/003 (2013.01) [G01S 17/894 (2020.01); G02B 9/06 (2013.01); G02B 27/0025 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An optical lens system comprising lens elements whose total number is two, the lens elements being, in order from an object side to an image side along an optical path, a first lens element and a second lens element, and each of the lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein at least one of the object-side surface and the image-side surface of at least one lens element of the optical lens system is aspheric;
wherein an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, a refractive index of the first lens element is N1, an entrance pupil diameter of the optical lens system is EPD, a maximum image height of the optical lens system is ImgH, a focal length of the optical lens system is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, an axial distance between the object-side surface of the first lens element and the image-side surface of the second lens element is TD, and the following conditions are satisfied:
5.0<V1/N1<33.0;
10.0<V1+V2≤46.0;
0.88≤EPD/ImgH<10.0;
0.50<f/EPD<2.10;
0.10[mm]<TL<3.0[mm]; and
1.50<TD/EPD<2.0.