Patent ID: 8385009

Claim:
A scanner lens, comprising: a first lens provided with a first focal length; a second lens; a third lens, wherein the first, second, and third lenses are sequentially arranged from an object end to an imaging end and are respectively provided with a plus diopter, a minus diopter, and a plus diopter, the first lens comprises an aspheric lens, a surface, facing the object end, of the first lens is provided with a curvature radius, the ratio of the curvature radius to the first focal length ranges between 0.005 and 0.25, and the ratio of the first focal length to a system focal length of the scanner lens ranges between 1 and 2; and an aperture stop disposed between the second and third lenses, wherein the first lens, second lens, third lens, and aperture stop are arranged with a view angle with a minimum of 70°.