Imaging lens and imaging apparatus
View Patent ↗Provided are an imaging lens that has a small amount of focus shift caused by temperature fluctuation and an imaging apparatus that has this imaging lens. The imaging lens consists of, in order from an object side: a first lens that is convex toward the object side and has a negative refractive power; a second lens that has a negative refractive power; a third lens that has a positive refractive power; a fourth lens that has a positive refractive power; a fifth lens that has a positive refractive power; and a sixth lens that has a negative refractive power. The imaging lens satisfies the following conditional expressions (1) to (4). −0.89< f/f 12<−0.53 (1) −0.19< f/f 1<−0.1 (2) −0.70< f/f 2<−0.45 (3) 2.4< f 1/ f 2<5.7 (4)
1. An imaging lens consisting of, in order from an object side:
a first lens that is convex toward the object side and has a negative refractive power;
a second lens that has a negative refractive power;
a third lens that has a positive refractive power;
a fourth lens that has a positive refractive power;
a fifth lens that has a positive refractive power; and
a sixth lens that has a negative refractive power,
wherein the following conditional expressions (1) to (4) are satisfied.
−0.89< f/f 12<−0.53 (1)
−0.19< f/f 1<−0.1 (2)
−0.70< f/f 2<−0.45 (3)
2.4< f 1/ f 2<5.7 (4)
where f is a focal length of a whole system,
f12 is a composite focal length of the first lens and the second lens,
f1 is a focal length of the first lens, and
f2 is a focal length of the second lens.
2. The imaging lens according to claim 1 ,
wherein the following conditional expression (1-1) is satisfied.
−0.81< f/f 12<−0.61 (1-1)
3. The imaging lens according to claim 1 ,
wherein the following conditional expression (2-1) is satisfied.
−0.17< f/f 1<−0.11 (2-1)
4. The imaging lens according to claim 2 ,
wherein the following conditional expression (2-1) is satisfied.
−0.17< f/f 1<−0.11 (2-1)
5. The imaging lens according to claim 1 ,
wherein the following conditional expression (3-1) is satisfied.
−0.64< f/f 2<−0.47 (3-1)
6. The imaging lens according to claim 2 ,
wherein the following conditional expression (3-1) is satisfied.
−0.64< f/f 2<−0.47 (3-1)
7. The imaging lens according to claim 3 ,
wherein the following conditional expression (3-1) is satisfied.
−0.64< f/f 2<−0.47 (3-1)
8. The imaging lens according to claim 4 ,
wherein the following conditional expression (3-1) is satisfied.
−0.64< f/f 2<−0.47 (3-1)
9. The imaging lens according to claim 1 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
10. The imaging lens according to claim 2 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
11. The imaging lens according to claim 3 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
12. The imaging lens according to claim 4 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
13. The imaging lens according to claim 5 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
14. The imaging lens according to claim 6 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
15. The imaging lens according to claim 7 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
16. The imaging lens according to claim 8 ,
wherein the following conditional expression (4-1) is satisfied.
2.7< f 1/ f 2<5.2 (4-1)
17. An imaging apparatus comprising the imaging lens according to claim 1 .
18. An imaging apparatus comprising the imaging lens according to claim 2 .
19. An imaging apparatus comprising the imaging lens according to claim 3 .
20. An imaging apparatus comprising the imaging lens according to claim 4 .