Imaging lens and imaging apparatus provided with the imaging lens
View Patent ↗An imaging lens substantially consisting of six lenses, composed of a first lens having a positive refractive power and a convex surface on the object side, a second lens having a negative refractive power and a concave surface on the image side, a third lens having a positive refractive power and a convex surface on the object side, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power and a concave surface on the image side, and a sixth lens having a negative refractive power with the image side surface having an aspherical shape which is concave on the image side near the optical axis and convex in a peripheral region.
1. An imaging lens substantially consisting of six lenses, composed of:
a first lens having a positive refractive power and a convex surface on the object side;
a second lens having a negative refractive power and a concave surface on the image side;
a third lens having a positive refractive power and a convex surface on the object side;
a fourth lens having a positive refractive power;
a fifth lens having a negative refractive power and a concave surface on the image side; and
a sixth lens having a negative refractive power with the image side surface having an aspherical shape which is concave on the image side near the optical axis and convex in a peripheral region, arranged in this order from the object side.
2. The imaging lens of claim 1 , wherein the third lens is a bi-convex lens.
3. The imaging lens of claim 1 , wherein the image side surface of the fifth lens has an aspherical shape which is concave on the image side near the optical axis and convex in a peripheral region.
4. The imaging lens of claim 1 , further satisfying a conditional expression given below:
vd 2<35 (2),
where vd2 is an Abbe number of the second lens with respect to the d-line.
5. An imaging apparatus provided with the imaging lens of claim 1 .
6. The imaging lens of claim 1 , wherein an aperture stop is disposed on the object side of the object side surface of the second lens.
7. The imaging lens of claim 6 , wherein the aperture stop is disposed on the object side of the object side surface of the first lens.
8. The imaging lens of claim 1 , wherein the lens satisfies a conditional expression given below:
vd 5<35 (1),
where, vd5 is an Abbe number of the fifth lens with respect to the d-line.
9. The imaging lens of claim 8 , further satisfying a conditional expression given below:
vd 5<33 (1-1).
10. The imaging lens of claim 9 , further satisfying a conditional expression given below:
vd 5<31 (1-2).
11. The imaging lens of claim 1 , further satisfying a conditional expression given below:
0.4 <f 6 /f 2<1.3 (4),
where:
f2 is a focal length of the second lens; and
f6 is a focal length of the sixth lens.
12. The imaging lens of claim 11 , further satisfying a conditional expression given below:
0.5 <f 6 /f 2<1.2 (4-1).
13. The imaging lens of claim 12 , further satisfying a conditional expression given below:
0.55 <f 6 /f 2<1.1 (4-2).
14. The imaging lens of claim 1 , further satisfying a conditional expression given below:
0.9 <f 3 /f 1 (3),
where:
f1 is a focal length of the first lens; and
f3 is a focal length of the third lens.
15. The imaging lens of claim 14 , further satisfying a conditional expression given below:
1.0 <f 3 /f 1<10 (3-1).
16. The imaging lens of claim 15 , further satisfying a conditional expression given below:
1.0 <f 3 /f 1<8 (3-2).
17. The imaging lens of claim 16 , further satisfying a conditional expression given below:
1.0 <f 3 /f 1<5 (3-3).