Patent ID: 7859771

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 refractive power, a second lens of negative refractive power, a third lens of positive refractive power, and a fourth lens of negative refractive power; and an image sensor placed aligned with the imaging lens system and placed at the image side of the imaging lens system, wherein the imaging module satisfying the formulas: D/T≧ 1.1, −3.5 <R 2 /F 1<−1.5, −2.5 <R 3/ F 2<−0.5, and 1.5 <|R 7/ F 4|<3.5, wherein D is the diagonal length of the sensing area of the image sensor, T is the length from the object surface of the first lens to the sensing surface of the image sensor, R 2 is the radius of curvature of the image side surface of the first lens, F 1 is the focal length of the first lens, R 3 is the radius of curvature of the object side surface of the second lens, F 2 is the focal length of the second lens, R 7 is the radius of curvature of the object side surface of the fourth lens, F 4 is the focal length of the fourth lens.