Patent ID: 7764443

Claim:
An imaging module comprising, an imaging lens system comprising, in the order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power; and a fourth lens of negative refraction power, and an image sensor aligned with the imaging lens system and placed at the image side of the imaging lens system, wherein the imaging module satisfies the formulas: 2.4 <F 1 /TTL< 3.0, −7.0 <F 2 /TTL<− 5.5, 0.95 <F 3 /TTL< 2.0, and −3.5 <F 4 /TTL<− 2.5, wherein TTL is the distance from the object surface of the first lens to the sensing surface of the image sensor on the optical axis of the imaging lens system, F 1 is the focal length of the first lens, F 2 is the focal length of the second lens, F 3 is the focal length of the third lens, and F 4 is the focal length of the fourth lens.