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

Claim 13:
14. An optical image lens assembly comprising, in order from an object side to an image side:
a first lens element having positive refractive power;
a second lens element having negative refractive power;
a third lens element; and
a fourth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof;
wherein a total number of lens elements in the optical image lens assembly is four;
wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, a central thickness of the third lens element is CT3, an Abbe number of the fourth lens element is V4, a maximum of refractive indexes of the first lens element, the second lens element, the third lens element and the fourth lens element is Nmax, a maximum of axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmax, a minimum of the axial distances between every two lens elements of the first lens element, the second lens element, the third lens element and the fourth lens element which are adjacent to each other is ATmin, and the following conditions are satisfied:

T12<T23;

T23<CT3;

23.3≤V4≤26.6;

1.65≤Nmax; and

1.0<ATmax/ATmin<8.0;

wherein a curvature radius of an object-side surface of the second lens element and a curvature radius of an image-side surface of the second lens element have the same sign.