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

Claim 10:
11. 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 with positive refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof;
a second lens element having a curvature radius of an object-side surface and a curvature radius of an image-side surface being the same sign;
a third lens element;
a fourth lens element having an image-side surface being concave in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fourth lens element are both aspheric, and the image-side surface of the fourth lens element comprises at least one convex critical point in an off-axis region thereof; and
a fifth lens element;
wherein a total number of lens elements in the imaging lens assembly is five, a curvature radius of the 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, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the imaging lens assembly is ImgH, a half of a maximum field of view of the imaging lens assembly is HFOV, and the following conditions are satisfied:

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

10<V3+V4<60; and

1.80<TL/ImgH+1/tan(HFOV)≤2.44.