Patent ID: 11877043
Assignee: JIANGXI LIANYI OPTICS CO., LTD
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An optical lens, wherein from an object side to an image side along an optical axis, the optical lens sequentially comprises:
a first lens with a positive focal power, wherein an object side surface of the first lens is convex;
a second lens with a negative focal power;
a stop;
a third lens with a negative focal power;
a fourth lens with a negative focal power;
a fifth lens with a positive focal power, wherein an object side surface of the fifth lens is convex at a paraxial region thereof, and an image side surface of the fifth lens is concave at a paraxial region thereof; and
a filter disposed between the fifth lens and an imaging plane;
wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are plastic aspherical lenses, and the optical lens satisfies expressions:

−1<f12/f345<0;

0.8<CT2-i/CT2<1.2; and

0.8<CT3-i/CT3<1.2;

where f12 is a combined focal length of the first lens and the second lens, f345 is a combined focal length of the third lens, the fourth lens and the fifth lens, CT2-i is a thickness at any position of the second lens along a normal direction, CT3-i is a thickness at any position of the third lens along a normal direction, CT2 is a center thickness of the second lens, and CT3 is a center thickness of the third lens.