Imaging lens and imaging apparatus

1. An imaging lens substantially consisting of five lenses of:

a first lens having a meniscus shape with its convex surface facing an object side and negative refractive power;

a second lens at least one of the surfaces of which is aspherical;

a third lens at least one of the surfaces of which is aspherical;

a stop;

a fourth lens at least one of the surfaces of which is aspherical; and

a fifth lens at least one of the surfaces of which is aspherical, which are in this order from the object side,

wherein an image-side surface of the second lens has a concave shape facing an image side and the second lens has negative refractive power, and an object-side surface of the third lens has a convex shape facing the object side and the third lens has positive refractive power, and an image-side surface of the fourth lens has a convex shape facing the image side and the fourth lens has positive refractive power, and the fifth lens has a meniscus shape with its convex surface facing the image side and negative refractive power when it is assumed that each of the second lens through the fifth lens has a whole shape in which its object-side lens surface and its image-side lens surface in a lens cross section including an optical axis have arc shapes, each of which passes through three points of two effective-diameter outermost edge points and a point on the optical axis, and

wherein the following conditional formulas (1) and (2) are satisfied:

0.10 <f 34 /L< 0.17  (1); and

0.40 <d 1-4 /L< 0.50  (2), where

f 34 : a combined paraxial focal length of the third lens and the fourth lens,

L: a distance on the optical axis from an object-side surface of the first lens to an image plane (a distance between the fifth lens and the image plane is a distance in air), and

d 1 - 4 : a distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens.

2. An imaging apparatus comprising:

the imaging lens, as defined in claim 1 , mounted thereon.

3. The imaging lens, as defined in claim 1 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

4. The imaging lens, as defined in claim 1 , wherein the following conditional formula (5) is satisfied:

0.012 <d 6-8 /L< 0.04  (5), where

d 6 - 8 : a distance on the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.

5. The imaging lens, as defined in claim 4 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

6. The imaging lens, as defined in claim 1 , wherein the following conditional formula (4) is satisfied:

0.02 <d 4-5 /L< 0.05  (4), where

d 4 - 5 : a distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens.

7. The imaging lens, as defined in claim 6 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

8. The imaging lens, as defined in claim 6 , wherein the following conditional formula (5) is satisfied:

0.012 <d 6-8 /L< 0.04  (5), where

d 6 - 8 : a distance on the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.

9. The imaging lens, as defined in claim 8 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

10. The imaging lens, as defined in claim 1 , wherein the following conditional formula (3) is satisfied:

0.45 <d 3-11 /L< 0.54  (3), where

d 3 - 11 : a distance on the optical axis from an object-side surface of the second lens to an image-side surface of the fifth lens.

11. The imaging lens, as defined in claim 10 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

12. The imaging lens, as defined in claim 10 , wherein the following conditional formula (5) is satisfied:

0.012 <d 6-8 /L< 0.04  (5), where

d 6 - 8 : a distance on the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.

13. The imaging lens, as defined in claim 12 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

14. The imaging lens, as defined in claim 10 , wherein the following conditional formula (4) is satisfied:

0.02 <d 4-5 /L< 0.05  (4), where

d 4 - 5 : a distance on the optical axis from the image-side surface of the second lens to the object-side surface of the third lens.

15. The imaging lens, as defined in claim 14 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.

16. The imaging lens, as defined in claim 14 , wherein the following conditional formula (5) is satisfied:

0.012 <d 6-8 /L< 0.04  (5), where

d 6 - 8 : a distance on the optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.

17. The imaging lens, as defined in claim 16 , wherein the following conditional formula (6) is satisfied:

L/r 3<−6.0  (6), where

r 3 : a curvature radius of an object-side surface of the second lens in the vicinity of the optical axis.