Imaging lens assembly

1. An imaging lens assembly, comprising:

a first lens with positive refractive power;

a second lens with negative refractive power;

a third lens with negative refractive power;

a fourth lens with positive refractive power;

a fifth lens with positive refractive power; and

a sixth lens with negative refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side, and satisfy the following conditions (1) to (5):

0.74≦ f 1 /f≦ 0.85  (1)

−10.00≦ f 3/ f≦− 5.00  (2)

0.50≦ f 5/ f≦ 0.85  (3)

2.20≦( R 3+ R 4)/( R 3 −R 4)≦5.00  (4)

−7.00≦( R 5+ R 6)/( R 5− R 6)≦−2.00  (5)

wherein f is the focal length of the imaging lens assembly; f 1 is the focal length of the first lens; f 3 is the focal length of the third lens; f 5 is the focal length of the fifth lens; R 3 is the curvature radius of the object side of the second lens; R 4 is the curvature radius of the image side of the second lens; R 5 is the curvature radius of the object side of the third lens; and R 6 is the curvature radius of the image side of the third lens.

2. The imaging lens assembly of claim 1 , further satisfying the following condition (6):

−5.00≦ d 2/ d 3≦−1.00  (6)

wherein d 2 is the axial distance between the image side of the first lens and the aperture stop, and d 3 is the axial distance between the aperture stop to the object side of the second lens.