Patent ID: 8031413

Claim:
A single focus wide-angle lens module, comprising a fixed aperture diaphragm, a first lens, a second lens, a third lens and a fourth lens, arranged from an object side to an image side in a sequence of: the first lens, having a concave surface on the image side and at least one aspheric surface; the fixed aperture diaphragm; the second lens, having a positive refractive power, a concave surface on the object side and at least one aspheric surface; the third lens, having a meniscus shape, a negative refractive power, a concave surface on the object side and at least one aspheric surface; the fourth lens, having a positive refractive power, a convex surface on the object side and at least one aspheric surface; wherein 1.2<|f 3 |/|f 4 |<2.2, and f 3 is a focal length value of the third lens, f 4 is a focal length value of the fourth lens.