Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; 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 is formed in a meniscus shape to have an object side convex surface. The sixth lens is formed in a meniscus shape to have an object side concave surface. The second lens has a specific focal length. The third lens has a specific focal length. The sixth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens having negative refractive power; 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 is formed in a meniscus shape to have an object side convex surface. The third lens is formed in a meniscus shape. The fourth lens has an object side concave surface. The fifth lens has two aspheric surfaces. The sixth lens has two aspheric surfaces and the image plane side convex surface. The fifth lens has a specific thickness, and the sixth lens has a specific thickness. The fourth lens has a specific Abbe's number. The fifth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having positive refractive power; 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 is formed in a meniscus shape to have an object side convex surface. The second lens is formed in a meniscus shape. The third lens has at least one aspheric surface. The fourth lens has at least one aspheric surface and an object side concave surface. The fifth lens has two aspheric surfaces. The sixth lens has two aspheric surfaces and the image plane side convex surface. The fourth lens is arranged to be away from the fifth lens by a specific distance. The fourth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged from an object side to an image plane side. The first lens group includes a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having at least one aspheric surface, arranged with a space in between. The second lens group includes a fourth lens having positive refractive power and at least one aspheric surface, a fifth lens having two aspheric surfaces, and a sixth lens having two aspheric surfaces, arranged with a space in between. The fifth lens is formed in a shape so that a curvature radius of the surface on the image plane side is positive near an optical axis. The sixth lens is formed in a shape so that a curvature radius of the surface on the object side is negative near an optical axis.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a positive first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a negative fifth lens, and a positive sixth lens. The first lens is formed in a shape so that surfaces thereof on the object and image plane sides have positive curvature radii. The second lens is formed in a shape so that a surface thereof on the image plane side has a negative curvature radius. The fifth lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius. The sixth lens is formed in a shape so that surfaces thereof on the object and image plane sides are aspheric.

Abstract: It is possible to (i) cause a sixth lens to more effectively correct various aberrations and (ii) make an optical overall length shorter. A first lens (L1) has positive refractive power. A fifth lens (L5) and a sixth lens (L6) each have negative refractive power. An object-side surface (L1F) of the first lens (L1) is a convex surface. At least one of an object-side surface and an image plane-side surface of each of a second lens (L2), a third lens (L3), a fourth lens (L4), and the fifth lens (L5) is an aspheric surface. An object-side surface (L6F) of the sixth lens (L6) is a concave surface and is an aspheric surface. An image plane-side surface (L6R) of the sixth lens (L6) is an optically planar surface throughout a region corresponding to an effective diameter of the image plane-side surface (L6R) of the sixth lens (L6).

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens having negative refractive power; a fifth lens; and a sixth lens having negative refractive power, arranged from an object side to an image plane side. The first lens is formed so that a surface on the object side has a positive paraxial curvature radius. The second lens is formed so that a surface on the image plane side has a positive paraxial curvature radius. The sixth lens is formed so that surfaces are aspherical and have specific paraxial curvature radii. The first lens is arranged so that a surface on the object side is away from an image plane by a specific distance on an optical axis. The imaging lens has a specific angle of view. The fourth lens is arranged away from the fifth lens by a specific distance.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The second lens is formed so that surfaces have positive paraxial curvature radii. The fourth lens is formed so that a surface on the image plane side has a negative paraxial curvature radius. The sixth lens is formed so that surfaces are aspherical, and the surface on the image plane side has a negative paraxial curvature radius. The first lens is arranged so that a surface on the object side is away from an image plane by a specific distance on an optical axis, and the imaging lens has a specific angle of view so that specific conditional expressions are satisfied.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; a third lens; a fourth lens; a fifth lens; and a sixth lens having negative refractive power, arranged in this order from an object side to an image plane side. The sixth lens is formed in a shape so that a curvature radius of a surface thereof on the object side and a curvature radius of a surface thereof on the image plane side are negative. The surface of the sixth lens on the image plane side has the specific curvature radius so that a specific conditional expression is satisfied.

Abstract: There is provided an imaging lens having small ratio of the total track length to the focal length of an overall optical system, reducing telephoto ratio, properly correcting aberrations and having the high resolution. An imaging lens comprises five optical elements, in order from an object side to an image side, comprising, a first lens as a first optical element having positive refractive power, a second lens as a second optical element having negative refractive power and a convex surface facing the object side near an optical axis, a third lens as a third optical element having the refractive power, and a fourth lens as a fourth optical element having refractive power and the convex surface facing the object surface near the optical axis, wherein and an aberration correction optical element as a fifth optical element are arranged between said third lens and said fourth lens, said aberration correction optical element has both flat surfaces near the optical axis and aspheric surfaces.

Abstract: There is provided an imaging lens with high-resolution which realizes reducing size, the low-profileness, low F-number and small telephoto ratio. An imaging lens comprising in order from an object side to an image side, a first lens having positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens having the positive refractive power, and a sixth lens, wherein a below conditional expression is satisfied: 0.6<TTL/f<1.0 where TTL: total track length, and f: focal length of the overall optical system.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a fifth lens having positive refractive power, a sixth lens having two aspheric surfaces, and a seventh lens having two aspheric surfaces. The imaging lens has a total of seven single lenses. The first to seventh lenses are arranged respectively with a space in between. The third lens is formed in a shape so that a surface on the object side is convex. The fourth lens is formed in a shape so that a surface on the object side is concave. The fifth lens is formed in a shape so that a surface on the image plane side is concave.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a front side lens group and a rear side lens group. The front side lens group includes a fourth lens and a fifth lens. The rear side lens group includes a sixth lens having two aspheric surfaces and a seventh lens having two aspheric surfaces. The imaging lens has a total of seven single lenses. The first to seventh lenses are arranged respectively with a space in between. The third and fourth lenses have convex surfaces on the image plane side. The fifth lens has a convex surface on the object side. The rear side lens group has a specific focal length.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a front side lens group and a rear side lens group. The front side lens group includes a fourth lens and a fifth lens. The rear side lens group includes a sixth lens and a seventh lens both having two aspheric surfaces. The imaging lens has a total of seven single lenses. The first to seventh lenses are arranged respectively with a space in between. The third lens has convex surfaces on both sides. The fourth lens has a concave surface on the object side. The fifth lens has a concave surface on the image plane side. The rear side lens group has a specific focal length.

Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens; a fifth lens having negative refractive power; and a sixth lens having negative refractive power, 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 on the object side and a surface on the image plane side have negative curvature radii. The first lens has a specific focal length, the second lens has a specific focal length, the fourth lens is arranged to be away from the fifth lens by a specific distance on an optical axis, and the surface of the sixth lens on the image plane side has a specific curvature radius so that specific conditional expressions are satisfied.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a positive first lens, a positive second lens, and a negative third lens. The second lens group includes a fourth lens, a fifth lens, and a sixth lens. The first lens is formed in a shape so that surfaces thereof on the object and image plane sides have positive curvature radii. The fifth lens is formed in a shape so that a surface thereof on the object side has a positive curvature radius. The sixth lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side are aspheric. The first to third lenses are arranged specifically and have specific Abbe's numbers.

Abstract: There is provided a compact imaging lens which meets demand of low-profileness, reduction in telephoto ratio and low F-number, and properly corrects aberrations. An imaging lens comprising in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens having a convex surface facing the image side near an optical axis, and a fifth lens having positive refractive power, wherein a below conditional expression (1) is satisfied: 0.64<TTL/f<1.0??(1) where f: focal length of the overall optical system of the imaging lens, and TTL: distance along the optical axis from an object-side surface of the first lens to an image plane.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens having negative refractive power, a second lens having negative refractive power, and a third lens. The second lens group includes a fourth lens and a fifth lens having negative refractive power. The first lens is formed in a shape so that a curvature radius of a surface thereof on the image plane side is positive. The fifth lens is formed in a shape so that a surface thereof on the image plane side is aspheric.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having at least one aspheric surface, arranged with a space in between. The second lens group includes a fourth lens having positive refractive power and at least one aspheric surface, a fifth lens having two aspheric surfaces, and a sixth lens having two aspheric surfaces, arranged with a space in between. The sixth lens is formed in a shape so that a curvature radius of the surface thereof on the image plane side is negative near an optical axis thereof.

Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens having positive refractive power, a second lens, and a third lens having at least one aspheric surface, arranged with a space in between. The second lens group includes a fourth lens having at least one aspheric surface, a fifth lens having negative refractive power and two aspheric surfaces, and a sixth lens having two aspheric surfaces, arranged with a space in between. The second lens is formed in a shape so that a curvature radius of a surface on the image plane side is negative near an optical axis. The sixth lens is formed in a shape so that a curvature radius of the surface on the image plane side is negative near an optical axis.