The invention relates to a small-head large-aperture pick-up lens. The lens is technically characterized by sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a diaphragm from an object side to an image side along an
optical axis, wherein the first lens has positive
refraction power, and the object-side surface of the first lens is a convex surface; the second lens, the third lens and the fourth lens all have refractive power; the fifth lens has positive refractive power, the paraxial position of the image-side surface of the fifthlens is a plane, and at least one convex surface exists at an off-axis position of the fifth lens; the sixth lens has negative refractive power, and the image-side surface of the sixth lens is concavesurface; the object-side surface and the image-side surface of each lens are aspheric surfaces; and the diaphragm is disposed on the object side of the first lens. According to the lens, the
head size of the lens is small, the screen-to-body ratio of a
mobile phone is improved, the performance of the lens is not reduced, resolution is high, and the lens has a
large aperture and can meet the requirement of a user for shooting clearer images.