Imaging lens and imaging apparatus

1. An imaging lens consisting of, in order from the object side to the image side:

a first lens having a negative refractive power and a concave surface toward the image side;

a second lens having a negative refractive power;

a third lens having a positive refractive power and a convex surface toward the image side;

a fourth lens having a convex surface toward the image side;

a fifth lens having a positive refractive power and a convex surface toward the image side; and

a sixth lens having a negative refractive power and a concave surface toward the object side; and

in which Conditional Formulae (1) and (2) below are satisfied:

0.15< f 1/ f 2<1.3  (1)

1.8< f 3/ f< 4.5  (2)

wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f is the focal length of the entire lens system.

2. An imaging lens as defined in claim 1 , wherein:

the surface toward the image side of the second lens is concave.

3. An imaging lens as defined in claim 1 , wherein:

the surface toward the image side of the second lens is of a shape in which a line normal to the surface at an arbitrary point at 30% or greater of the image height of the surface intersects with the optical axis toward the image side of the surface.

4. An imaging lens as defined in claim 1 , in which Conditional Formula (3) below is satisfied:

−1.9< f 12/ f<− 0.8  (3)

wherein f12 is the combined focal length of the first lens and the second lens.

5. An imaging lens as defined in claim 1 , in which Conditional Formula (4) below is satisfied:

−10< f 2/ f<− 2  (4).

6. An imaging lens as defined in claim 1 , in which Conditional Formula (5) below is satisfied:

−18< r 6/ f<− 1.7  (5)

wherein r6 is the radius of curvature of the surface toward the image side of the third lens.

7. An imaging lens as defined in claim 1 , in which Conditional Formula (6) below is satisfied:

0.9< f 5/ f< 3  (6)

wherein f5 is the focal length of the fifth lens.

8. An imaging lens as defined in claim 1 , in which Conditional Formula (7) below is satisfied:

−3< f 6/ f<− 1  (7)

wherein f6 is the focal length of the sixth lens.

9. An imaging lens as defined in claim 1 , in which Conditional Formula (8) below is satisfied:

L 56/ f< 0.6  (8)

wherein L56 is the distance along the optical axis between the fifth lens and the sixth lens.

10. An imaging lens as defined in claim 1 , in which Conditional Formula (9) below is satisfied:

0.6<max| f/fx|< 0.85  (9)

wherein fx is the focal length of an xth lens, and x is an integer from 1 to 6.

11. An imaging lens as defined in claim 1 , wherein:

the combined refractive power of the fourth lens and the fifth lens is positive; and

stop is positioned between the third lens and the fourth lens.

12. An imaging lens as defined in claim 1 , in which Conditional Formulae (10) and (11) below are satisfied:

55<ν5  (10)

ν6<30  (11)

wherein ν5 is the Abbe's number of the fifth lens, and ν6 is the Abbe's number of the sixth lens.

13. An imaging lens as defined in claim 1 , in which at least one of Conditional Formulae (1-1) and (2-1) below is satisfied:

0.15< f 1/ f 2<1.1  (1-1)

2< f 3/ f< 4  (2-1).

14. An imaging lens as defined in claim 4 , in which Conditional Formula (3-1) below is satisfied:

−1.6< f 12/ f<− 0.9  (3-1).

15. An imaging lens as defined in claim 5 , in which Conditional Formula (4-1) below is satisfied:

−8.5< f 2/ f<− 2.5  (4-1).

16. An imaging lens as defined in claim 6 , in which at least one of Conditional Formulae (5-1) and/or (5-2) below is satisfied:

−15.5< r 6/ f<− 1.9  (5-1)

−3< r 6/ f<− 1.9  (5-2).

17. An imaging lens as defined in claim 7 , in which Conditional Formula (6-1) below is satisfied:

1.1< f 5/ f< 2.5  (6-1).

18. An imaging lens as defined in claim 8 , in which Conditional Formula (7-1) below is satisfied:

−2.5< f 6/ f<− 1.2  (7-1).

19. An imaging lens as defined in claim 12 , in which at least one of Conditional Formulae (10-1) and/or (11-1) below is satisfied:

60<ν5  (10-1)

ν6<25  (11-1).

20. An imaging apparatus equipped with an imaging lens as defined in claim 1 .