Patent ID: 8369031

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 the following sequence: the first lens, having a negative refractive power and a concave surface toward the image side and at least one aspheric surface; the fixed aperture diaphragm; the second lens, having a positive refractive power and a concave surface toward the object side, the second lens being made of glass; the third lens, having a meniscus shape, a positive refractive power, a concave surface toward the object side, and at least one aspheric surface; and the fourth lens, having a positive refractive power, a convex surface toward the object side, and at least one aspheric surface, wherein 0<|f2|/|f3|<0.8, and f2 is a focal length value of the second lens, f3 is a focal length value of the third lens.