Patent ID: 11885937
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical photographing lens assembly comprising nine lens elements, the nine 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, a seventh lens element, an eighth lens element and a ninth lens element; each of the nine lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein there is an air gap in a paraxial region between the eighth lens element and the ninth lens element, the ninth lens element has negative refractive power, and each of at least three lens elements of the optical photographing lens assembly has at least one aspheric lens surface having at least one inflection point;
wherein the optical photographing lens assembly further comprises an aperture stop, an axial distance between the aperture stop and the image-side surface of the ninth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the ninth lens element is TD, a focal length of the optical photographing lens assembly is f, an entrance pupil diameter of the optical photographing lens assembly is EPD, a maximum value among axial distances between each of all adjacent lens elements of the optical photographing lens assembly is ATmax, a minimum value among central thicknesses of all lens elements of the optical photographing lens assembly is CTmin, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:

0.50<SD/TD<1.20;

0.50<f/EPD<5.00;

3.19≤ATmax/CTmin<15.0; and

0.50<TL/EPD<7.00;

wherein an Abbe number of the i-th lens element is Vi, and at least two lens elements of the optical photographing lens assembly satisfy the following condition:

Vi<28.0, wherein i=1,2,3,4,5,6,7,8 or 9.