Imaging lens assembly

1. An imaging lens assembly LA comprising, arranged in succession from an object side to an image side:

a first lens L 1 having a positive refractive power,

a second lens L 2 having a negative refractive power,

a third lens L 3 having a negative refractive power,

a fourth lens L 4 having a positive or a negative refractive power,

a fifth lens L 5 having a positive refractive power,

and a sixth lens L 6 having a negative refractive power,

wherein the following conditions (1)˜(4) are satisfied:

1.40≦( R 3+ R 4)/( R 3− R 4)≦2.00  (1)

−60.00≦( R 5+ R 6)/( R 5− R 6)≦−1.00  (2)

−2.20≦( R 7+ R 8)/( R 7− R 8)≦−0.05  (3)

0.06≦ d 11/ f≦ 0.15  (4)

where,

R3 is a curvature radius of the object side of the second lens L 2 ;

R4 is a curvature radius of the image side of the second lens L 2 ;

R5 is a curvature radius of the object side of the third lens L 3 ;

R6 is a curvature radius of the image side of the third lens L 3 ;

R7 is a curvature radius of the object side of the fourth lens L 4 ;

R8 is a curvature radius of the image side of the fourth lens L 4 ;

d11 is an axial distance between the image side of the fifth lens L 5 and the object side of sixth lens L 6 ;

f is a focal length of the imaging lens assembly LA.

2. The imaging lens assembly LA as claimed in claim 1 further satisfying the following conditions (5)˜(6):

0.60≦ f 1/ f≦ 0.80  (5)

−1.20≦( R 1+ R 2)/( R 1− R 2)≦−0.80  (6)

Where:

f is the focal length of the imaging lens assembly LA;

f1 is a focal length of the first lens L 1 ;

R1 is a curvature radius of the object side of the first lens L 1 ;

R2 is a curvature radius of the image side of the first lens L 1 .

3. The imaging lens assembly LA as claimed in claim 1 further satisfying the following condition (7):

−2.00≦ f 2/ f≦− 1.10  (7)

Where:

f is the focal length of the imaging lens assembly LA;

f2 is a focal length of the second lens L 2 .

4. The imaging lens assembly LA as claimed in claim 1 further satisfying the following condition (8):

−70.00≦ f 3/ f≦− 7.00  (8)

Where:

f is the focal length of the imaging lens assembly LA;

f3 is a focal length of the third lens L 3 .

5. The imaging lens assembly LA as claimed in claim 1 further satisfying the following conditions (9)˜(10):

0.50≦ f 5/ f≦ 0.80  (9)

1.60≦( R 9+ R 10)/( R 9− R 10)≦3.00  (10)

Where:

f is the focal length of the imaging lens assembly LA;

f5 is a focal length of the fifth lens L 5 ;

R9 is a curvature radius of the object side of the fifth lens L 5 ;

R10 is a curvature radius of the image side of the fifth lens L 5 .

6. The imaging lens assembly LA as claimed in claim 1 further satisfying the following conditions (11)˜(12):

−1.00≦ f 6/ f≦− 0.40  (11)

0.05≦( R 11+ R 12)/( R 11− R 12)≦0.80  (12)

Where:

f is the focal length of the imaging lens assembly LA;

f6 is a focal length of the sixth lens L 6 ;

R11 is a curvature radius of the object side of the sixth lens L 6 ;

R10 is a curvature radius of the image side of the sixth lens L 6 .