Imaging lens and imaging device
An imaging lens according to the present invention includes a negative first lens, a meniscus-shaped negative second lens having a concave surface facing to an object side, a positive third lens, a positive fourth lens having a convex surface on the object side, a positive fifth lens, a negative sixth lens, and a positive seventh lens arranged in order from the object side. Furthermore, an imaging device according to the present invention includes the imaging lens.
1. An imaging lens comprising:
a first lens having negative refractive power;
a meniscus-shaped second lens having a concave surface facing to an object side and having negative refractive power;
a third lens having a convex shape on the object side and having positive refractive power;
a fourth lens having a convex surface on the object side and having positive refractive power;
a fifth lens having positive refractive power;
a sixth lens having negative refractive power; and
a seventh lens having positive refractive power, wherein
the first lens to the seventh lens are arranged in above order from the object side, and
the imaging lens satisfies a following conditional expression:
f0/(4×YS1)≤1.0
where
f0: focal length of the imaging lens
YS1: maximum ray height of upper line of axial ray on an object side surface of the first lens.
2. The imaging lens according to claim 1 , wherein
the imaging lens satisfies a following conditional expression:
0< f 1/ f 2<1.0
where
f1: focal length of the first lens
f2: focal length of the second lens.
3. The imaging lens according to claim 1 , wherein
the imaging lens satisfies a following conditional expression:
0<− f 12/ f 4567<1.0
where
f12: composite focal length of the first lens and the second lens
f4567: composite focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.
4. The imaging lens according to claim 1 , wherein
at least one of the fourth lens, the fifth lens, and the seventh lens is formed of a glass material which satisfies a following condition:
−15< dndt _ p/dndt 6<0
where
dndt_p: temperature coefficient of a relative refractive index of the glass material relative to a d line
dndt6: temperature coefficient of a relative refractive index of a glass material of the sixth lens relative to the d line.
5. The imaging lens according to claim 1 , wherein
the fifth lens and the sixth lens are bonded to each other.
6. The imaging lens according to claim 1 , wherein
at least one of the fourth lens to the seventh lens is supported by a lens supporting portion so that a position of the lens can be changed along an optical axis direction.
7. The imaging lens according to claim 1 , wherein
the imaging lens satisfies a following conditional expression:
0.1<{( Yim /tan (θ im ))/ f 0} 2 <0.4
where
Yim: image height of an effective image circle
θim: incident half angle of view of the effective image circle
f0: focal length of the imaging lens.
8. An imaging device comprising:
the imaging lens according to claim 1 ; and
an image sensor configured to receive an optical image formed by the imaging lens and convert the image into an electrical image signal.
9. An imaging lens comprising:
a first lens having negative refractive power;
a meniscus-shaped second lens having a concave surface facing to an object side and having negative refractive power;
a third lens having positive refractive power;
a fourth lens having a convex surface on the object side and having positive refractive power;
a fifth lens having positive refractive power;
a sixth lens having negative refractive power; and
a seventh lens having positive refractive power, wherein
the first lens to the seventh lens are arranged in above order from the object side, and
at least one of the fourth lens to the seventh lens is supported so that a position of the lens can be changed along a direction perpendicular to an optical axis.
10. An imaging lens comprising:
a first lens having negative refractive power;
a meniscus-shaped second lens having a concave surface facing to an object side and having negative refractive power;
a third lens having positive refractive power;
a fourth lens having a convex surface on the object side and having positive refractive power;
a fifth lens having positive refractive power;
a sixth lens having negative refractive power; and
a seventh lens having positive refractive power, wherein
the first lens to the seventh lens are arranged in above order from the object side, and
the imaging lens satisfies a following conditional expression:
0.1<{( Yim /tan (θ im ))/ f 0} 2 <0.4
where
Yim: image height of an effective image circle
θim: incident half angle of view of the effective image circle
f0: focal length of the imaging lens.