Patent ID: 11953657
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A photographing optical lens assembly comprising eight lens elements, the eight lens elements being, in order from an object side to an image side along an optical path:
a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element;
wherein each of the eight lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
wherein the first lens element has positive refractive power, the third lens element has positive refractive power, the object-side surface of the fifth lens element is concave in a paraxial region thereof, the object-side surface of the seventh lens element is convex in a paraxial region thereof, the image-side surface of the eighth lens element is concave in a paraxial region thereof;
wherein at least one of the object-side surface and the image-side surface of the eighth lens element comprises at least one critical point in an off-axis region thereof;
wherein an axial distance between the sixth lens element and the seventh lens element is T67, an axial distance between the seventh lens element and the eighth lens element is T78, a curvature radius of the object-side surface of the fifth lens element is R9, a focal length of the photographing optical lens assembly is f, a focal length of the seventh lens element is f7, a focal length of the eighth lens element is f8, an f-number of the photographing optical lens assembly is Fno, and the following conditions are satisfied:

−0.40<(T67−T78)/(T67+T78);

−1.0<R9/f<0;

1.4<Fno<2.2; and

1.2<|f7/f8|<3.5.