Patent ID: 11953654
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical image lens assembly comprising, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof;
a second lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof;
a third lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof; and
a fourth lens element having negative refractive power;
wherein the optical image lens assembly further comprises an aperture stop disposed between the first lens element and an image surface;
wherein an axial distance between the second lens element and the third lens element is a maximum among all axial distances between adjacent lens elements in the optical image lens assembly; a total number of lens elements in the optical image lens assembly is four;
wherein an f-number of the optical image lens assembly is Fno, the axial distance between the second lens element and the third lens element is T23, a central thickness of the second lens element is CT2, and the following conditions are satisfied:

1.50<Fno≤2.10; and

0.80<T23/CT2<2.50;

wherein a maximum of absolute values of curvature radii of object-side surfaces and image-side surfaces of the first lens element, the second lens element, the third lens element and the fourth lens element is an absolute value of a curvature radius of the object-side surface of the third lens element.