Patent ID: 7064905

Claim:
An imaging lens comprising, in sequence from an object side to an image plane side: an aperture stop with a predetermined diameter; a first lens with an overall positive refractive power having a convex surface facing toward the object side; a second lens with an overall positive refractive power having a concave surface facing toward the object side; and a third lens with an overall negative refractive power having a concave surface facing toward the object side; wherein the imaging lens includes only three lenses, the first lens, the second lens, and the third lens; wherein said second lens is formed with aspherical surfaces on said object side surface and an image plane side surface; and wherein said third lens is formed with aspherical surfaces on said object side surface and an image plane side surface and is formed with an inflection point, where a curvature orientation changes, within an effective diameter range of said aspherical surface on said image plane side surface.