US 2015/0029603 A1Published application

Imaging lens

AssigneesOptical Logic Inc., Kantatsu Co., Ltd.

InventorsYoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Ichiro KURIHARA, Tomohiro YONEZAWA

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Abstract

An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; and a third lens having positive refractive power, arranged in the order from an object side to an image plane side. The first lens and the third lens have object-side surfaces and image plane-side surfaces, curvature radii of which are both positive. When the first lens has refractive power P1, the second lens has refractive power P2, the third lens has refractive power P3, the first lens has a focal length f1, and the third lens has a focal length f3, the imaging lens satisfies the following conditional expressions: 5.0<(P1+P3)/P2<8.5 6<f3/f1<30

Claims5

Dependent claims

An imaging lens comprising:

a first lens having positive refractive power;
a second lens having positive refractive power;
and
a third lens having positive refractive power, arranged in this order from an object side to an image plane side,
wherein said first lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have positive curvature radii,
said third lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have positive curvature radii, and
said first lens has a refractive power P1, said second lens has a refractive power P2, said third lens has a refractive power P3, said first lens has a focal length f1, and said third lens has a focal length f3 so that the following conditional expressions are satisfied:
5.0<(P1+P3)/P2<8.5
6<f3/f1<30.

6 more elements

Dependencies are inferred from the claim text.