Optical imaging lens assembly

An optical imaging lens assembly, sequentially comprising, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens with refractive power respectively, wherein there is an air space between any two adjacent lenses;

• the first lens has positive refractive power;
• the second lens has negative refractive power;
• the third lens has positive refractive power;
• the fourth lens has negative refractive power, an object-side surface of the fourth lens is a concave surface, while an image-side surface of the fourth lens is a concave surface;
• the fifth lens has positive refractive power;
• the eighth lens has positive refractive power;
• the ninth lens has negative refractive power;
• and
• ImgH is a half of a diagonal length of an effective pixel region on an imaging surface, T89 is a spacing distance of the eighth lens and the ninth lens on the optical axis, ImgH and T89 meet 6.0<ImgH/T89<7.0;
• f is a total effective focal length of the optical imaging lens assembly, f8 is an effective focal length of the eighth lens, f9 is an effective focal length of the ninth lens, f and f8 and f9 meet:
• 1.0<f/(f8+f9)<1.5;
• TTL is an on-axis distance from an object-side surface of the first lens to the imaging surface, Fno is an f-number of the optical imaging lens assembly, TTL and Fno meet:
• 4.5 mm<TTL/Fno<5.0 mm;
• CT1 is a center thickness of the first lens on the optical axis, CT8 is a center thickness of the eighth lens on the optical axis, CT1 and CT8 meet:
• 1.0<CT8/CT1<1.5.