Patent ID: 11886041
Assignee: CHANGZHOU RAYTECH OPTRONICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An camera optical lens, comprising 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;
a fourth lens;
a fifth lens having negative refractive power;
a sixth lens having negative refractive power;
a seventh lens; and
an eighth lens,
wherein an object side surface of the second lens is a convex surface at a paraxial position, and image side surface of the second lens is a concave surface at the paraxial position, an object side surface of the eighth lens is a convex surface at a paraxial position, an image side surface of the eighth lens is a concave surface at the paraxial position, and at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens comprises a free-form surface, wherein the camera optical lens further satisfies:

2.10≤f2/f≤11.74;

−14.09≤(R3+R4)/(R3−R4)≤−2.21; and

0.02≤d3/TTL≤0.10,

where
f denotes a total focal length of the camera optical lens,
f2 denotes a focal length of the second lens,
R3 denotes a central curvature radius of an object side surface of the second lens,
R4 denotes a central curvature radius of an image side surface of the second lens,
d3 denotes an on-axis thickness of the second lens, and
TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.