Patent ID: 11860450
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging lens assembly comprising seven lens elements, the seven 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, a fifth lens element, a sixth lens element and a seventh lens element;
wherein the first lens element has an object-side surface being concave in a paraxial region thereof, the fifth lens element has positive refractive power, at least one of an object-side surface and an image-side surface of the seventh lens element has at least one critical point in an off-axis region thereof, and an absolute value of a focal length of the sixth lens element is smaller than an absolute value of a focal length of the seventh lens element;
wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is Td, a maximum effective radius of the image-side surface of the seventh lens element is Y72, and the following condition is satisfied:

Td/|Y72|<1.80.