Patent ID: 11880048
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. An imaging lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side:
a first lens element;
a second lens element;
a third lens element;
a fourth lens element having an image-side surface being concave in a paraxial region thereof; and
a fifth lens element having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fifth lens element comprises at least one convex critical point in an off-axis region thereof;
wherein a total number of lens elements in the imaging lens assembly is five, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, a focal length of the imaging lens assembly is f, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, and the following conditions are satisfied:

(|R7|+|R8|)/f<1.50;

10<V3+V4<60;

|f1/f3|<1.0; and

−2.0<f4/f5<−0.75.