US 12,339,520 B2
Camera optical lens
Vadim Vlakhko, Moscow (RU); Fedor Churliaev, Moscow (RU); Johan Sand, Tampere (FI); Ossi Pirinen, Tampere (FI); Mika Riihimies, Tampere (FI); and Tuomas Punta, Tampere (FI)
Assigned to Changzhou AAC Raytech Optronics Co., Ltd., Changzhou (CN); and DynaOptics Ltd, Singapore (SG)
Filed by Changzhou AAC Raytech Optronics Co., Ltd., Changzhou (CN); and DynaOptics Ltd, Singapore (SG)
Filed on Apr. 26, 2022, as Appl. No. 17/730,108.
Prior Publication US 2023/0341657 A1, Oct. 26, 2023
Int. Cl. G02B 9/64 (2006.01); G02B 3/00 (2006.01)
CPC G02B 9/64 (2013.01) [G02B 3/0043 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A camera optical lens, comprising sequentially from an object side to an image side:
a first lens having negative refractive power,
a second lens having positive refractive power,
a third lens having positive refractive power,
a fourth lens having positive refractive power,
a fifth lens having negative refractive power,
a sixth lens having positive refractive power, and
a seventh lens having negative refractive power,
wherein an object side surface and an image side surface of the seventh lens are free-form surfaces, and
wherein a focal length of the camera optical lens is f; a focal length of the first lens is f1; a focal length of the third lens is f3; a focal length of the fourth lens is f4; a refractive index of the third lens is nd3; a refractive index of the sixth lens is nd6; a refractive index of the seventh lens is nd7, a curvature radius of an object side surface of the seventh lens is R13, a curvature radius of an image side surface of the seventh lens is R14, and f, f1, f3, f4, nd3, nd6, nd7, R13 and R14 satisfy the following relational expressions:
−1.52≤f1/f≤−1.38;
1.56≤nd3≤1.59;
1.53≤nd6≤1.81;
1.61≤nd7≤1.67;
2.04≤f3/f4≤2.27;
1.06≤(R13+R14)/(R13−R14)≤1.22.