Patent ID: 7663813

Claim:
An imaging lens module, comprising a fixed diaphragm and an optical module, and the optical module comprising first, second, third, fourth and fifth lenses arranged from an object side to an image side in a sequence of: the first lens, having a negative refractive power, a convex surface disposed towards the object side, and a concave surface disposed towards the image side; the diaphragm; the second lens, having a positive refractive power, a convex surface disposed towards the image side; the third lens, being a negative meniscus lens, with the absolute value of a radius of curvature facing the image side smaller than the absolute value of a radius of curvature facing the object side; the fourth lens, being a positive lens, with the absolute value of a radius of curvature facing the image side greater than the absolute value of a radius of curvature facing the object side, wherein the third and fourth lenses are adhered to form a composite lens; and the fifth lens, having a positive refractive power; wherein 1<|f|/|f 2 |<1.5, and |f 2 | is the absolute value of the focal length of the second lens, and |f| is the absolute value of the focal length of the whole lens module.