US 12,242,028 B2
Imaging lens system, camera module and fingerprint recognition module
Haojie Zeng, Nanchang (CN); and Yilong Wang, Nanchang (CN)
Assigned to JIANGXI LIANYI OPTICS CO., LTD., Nanchang (CN)
Filed by JIANGXI LIANYI OPTICS CO., LTD., Nanchang (CN)
Filed on Jan. 19, 2022, as Appl. No. 17/578,501.
Application 17/578,501 is a continuation of application No. PCT/CN2020/078021, filed on Mar. 5, 2020.
Claims priority of application No. 201910664291.7 (CN), filed on Jul. 23, 2019.
Prior Publication US 2022/0137338 A1, May 5, 2022
Int. Cl. G02B 13/18 (2006.01); G02B 9/12 (2006.01); G02B 13/00 (2006.01); G06V 10/147 (2022.01); G06V 40/13 (2022.01); H04N 23/50 (2023.01)
CPC G02B 13/0035 (2013.01) [G02B 9/12 (2013.01); G06V 10/147 (2022.01); G06V 40/1318 (2022.01); H04N 23/50 (2023.01)] 18 Claims
OG exemplary drawing
 
1. An imaging lens system, from an object side to an imaging plane, sequentially comprising:
a flat glass;
a first lens with a negative focal power, an object side surface of the first lens being convex, an image side surface of the first lens being concave;
a second lens with a positive focal power, an object side surface of the second lens being convex, an image side surface of the second lens being concave;
a stop; and
a third lens with a positive focal power, an image side surface of the third lens being convex;
wherein the imaging lens system meets expressions:
f/EPD≤1.64;
0<BFL/IH<0.2;
−0.73<(CT3−CT1)/(ET1−ET3)<−0.45;
where f represents an effective focal length of the imaging lens system, EPD represents an entrance pupil diameter of the imaging lens system; BFL represents a distance from a vertex of the image side surface of the third lens to the imaging plane on an optical axis, IH represents a maximum image height of the imaging lens system; CT3 represents a center thickness of the third lens, CT1 represents a center thickness of the first lens, ET3 represents an edge thickness of the third lens, and ET1 represents an edge thickness of the first lens.