Optical imaging lens

An optical imaging lens, sequentially comprising, from an object side to an image side along an optical axis:

• a first lens with refractive power;
• a second lens with positive refractive power;
• a third lens with positive refractive power, wherein an image-side surface thereof is a convex surface;
• a fourth lens with refractive power, wherein an object-side surface thereof is a concave surface;
• a fifth lens with positive refractive power, wherein an object-side surface thereof is a concave surface;
• a sixth lens with refractive power;
• and
• a seventh lens with refractive power, wherein
• a total effective focal length f of the optical imaging lens and a curvature radius R4 of an image-side surface of the second lens meet 0.6<R4/f<1.5;
• and
• TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens on the optical axis, and ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens, TTL and ImgH meet 0.55<TTL/(ImgH×2)<0.75.