Patent ID: 8379326

Claim:
An imaging lens comprising only four lenses: a first lens: a second lens; a third lens; an aperture stop; and a fourth lens, which are sequentially arranged from the object side of the imaging lens, wherein the first lens has negative power, and an object-side surface of the first lens is convex and an image-side surface of the first lens is concave, and wherein an object-side surface and an image-side surface of the second lens are aspheric, and the second lens has negative power in the vicinity of the optical axis of the imaging lens, and the object-side surface of the second lens is convex in the vicinity of the optical axis, and the image-side surface of the second lens is concave in the vicinity of the optical axis, and wherein an object-side surface and an image-side surface of the third lens are aspheric, and the third lens has positive power in the vicinity of the optical axis of the imaging lens, and the object-side surface of the third lens is convex in the vicinity of the optical axis, and the image-side surface of the third lens is concave in the vicinity of the optical axis, and wherein an object-side surface and an image-side surface of the fourth lens are aspheric, and the fourth lens has positive power in the vicinity of the optical axis of the imaging lens, and the object-side surface of the fourth lens is concave in the vicinity of the optical axis, and the image-side surface of the fourth lens is convex in the vicinity of the optical axis.