Kantatsu Co., Ltd.

Optical Logic Inc.

Tokyo Visionary Optics Co., Ltd.

Hitoshi Hirano

Yoji Kubota

Kenichi Kubota

Tomohiro Yonezawa

Hisao Fukaya

Yoshio Ise

Ichiro Kurihara

Sayuri Noda

Sumio Fukuda

Yukio Sekine

An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

Imaging lens

An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

Imaging lens with positive-negative-negative-positive refractive power lenses on object side

There is provided a compact imaging lens configured to properly correct aberrations. The imaging lens includes, in order from an object side to an image side, a first lens Lwith positive refractive power, a second lens Lwith negative refractive power, a third lens Lwith positive refractive power, a fourth lens Lwith positive refractive power, a fifth lens L, a sixth lens L, a seventh lens Lwith positive refractive power, and an eighth lens Lwith negative refractive power. The eighth lens Lis formed in a shape of a meniscus lens in a paraxial region, and has an aspheric image-side surface having at least one inflection point. In addition, the following conditional expressions are satisfied:−5.00<2/<−2.0010.00<4/<25.00

An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

An imaging lens includes a first lens; a second lens; a third lens having negative refractive power; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave at a paraxial region thereof. The seventh lens is formed in a shape so that a surface thereof on the image plane side is aspheric. The first lens and the second lens have a specific composite focal length. The third lens have a specific focal length.

An imaging lens includes a first lens; a second lens; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The first lens has at least one aspheric surface. The fifth lens has two aspheric surfaces. The sixth lens is formed in a shape so that a surface thereof on the object side is convex at a paraxial region thereof and a surface thereof on the image plane side is concave at a paraxial region thereof. The seventh lens has two aspheric surfaces.

There is provided a compact imaging lens configured to properly correct aberrations. The imaging lens includes, in order from an object side to an image side, a first lens Lhaving negative refractive power, a second lens Lhaving negative refractive power, a third lens Lhaving positive refractive power, a fourth lens L, a fifth lens L, a sixth lens L, a seventh lens L, and an eighth lens Lhaving negative refractive power. The eighth lens Lhas an aspheric image-side surface having at least one inflection point.

There is provided a compact imaging lens configured to properly correct aberrations. The imaging lens includes, in order from an object side to an image side, a first lens Lwith positive refractive power, a second lens Lwith negative refractive power, a third lens Lwith positive refractive power, a fourth lens Lwith negative refractive power, a fifth lens L, a sixth lens L, a seventh lens Lwith positive refractive power, and an eighth lens Lwith negative refractive power. The fourth lens is formed in a shape of a meniscus lens having an object-side surface being concave in a paraxial region. The eighth lens Lhas an aspheric image-side surface having at least one inflection point. Furthermore, the following conditional expression is satisfied:0.04&#x3c;34/&#x3c;0.15where

An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens, arranged in this order from an object side to an image plane side. The imaging lens has a total of nine lenses. The eighth lens has at least one aspheric surface. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape. The ninth lens is formed in the shape so that the surface thereof on the image plane side has a specific paraxial curvature radius.

There is provided a compact imaging lens configured to properly correct aberrations. The imaging lens includes, in order from an object side to an image side, a first lens Lwith positive refractive power, a second lens Lwith negative refractive power, a third lens Lwith positive refractive power, a fourth lens Lwith negative refractive power, a fifth lens L, a sixth lens L, a seventh lens Lwith positive refractive power, and an eighth lens Lwith negative refractive power. The fourth lens is formed in a shape of a meniscus lens having an object-side surface being concave in a paraxial region. The eighth lens Lhas an aspheric image-side surface having at least one inflection point. Furthermore, the following conditional expression is satisfied:0.04&#x3c;34/&#x3c;0.15wheref: a focal length of the overall optical system of the imaging lens, andD34: a distance along the optical axis between the third lens and the fourth lens.

An imaging lens includes a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens having positive refractive power; an eighth lens; and a ninth lens, arranged in this order from an object side to an image plane side. The imaging lens has a total of nine lenses. The eighth lens is formed in a shape so that a surface thereof on the object side has an aspherical shape. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape.

An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side with spaces in between each of the lenses. The first lens has one aspheric surface. The third lens has one aspheric surface. The fourth lens has one aspheric surface. The fifth lens has two aspheric surfaces and the surface thereof on the object side is convex toward the object side near an optical axis thereof. The sixth lens has two aspheric surfaces and the surface thereof on the image plane side is convex toward the image plane side near an optical axis thereof. The second lens and the third lens have a specific focal length. The second lens and the fifth lens have a specific Abbe's number.

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Nagano, Japan

Hitoshi Hirano