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 having one aspheric surface and positive refractive power; a second lens having one aspheric surface and negative refractive power; a third lens having one aspheric surface; a fourth lens having one aspheric surface; a fifth lens having one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces, arranged in this order from an object side to an image plane side respectively with a space in between. The imaging lens has a total of seven lenses. The first lens is formed in a meniscus shape so that a surface on the object side is convex near an optical axis. The sixth lens is formed in a shape so that a surface on the image plane side is concave near an optical axis. The fifth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens; a second lens; a third lens; 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 imaging lens has a total of seven lenses. The first to seventh lenses are arranged respectively with a space in between. The first lens is formed in a shape so that a surface on the object side is convex near an optical axis. The second lens is formed in a shape so that a surface on the image plane side is concave near an optical axis. The fifth lens is formed in a shape so that a surface on the image plane side is concave near an optical axis. The seventh lens is formed in a shape so that a surface on the image plane side has one inflexion point.

Abstract: An imaging lens includes a first lens having at least one aspheric surface and positive refractive power; a second lens having at least one aspheric surface and negative refractive power; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens having at least one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces, arranged in this order from an object side to an image plane side respectively with a space in between. The imaging lens has a total of seven lenses. The fifth lens is disposed away from the sixth lens by a specific distance on an optical axis.

Abstract: An imaging lens includes a first lens having at least one aspheric surface and positive refractive power; a second lens having at least one aspheric surface; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens having at least one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces and negative refractive power, arranged in this order from an object side to an image plane side respectively with a space in between. The imaging lens has a total of seven lenses. The fourth lens and the sixth lens have specific Abbe's numbers.

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, and a sixth lens. The second lens has a convex surface facing the image plane side near an optical axis thereof. The fifth lens has a concave surface facing the image plane side near an optical axis thereof. The sixth lens has a concave surface facing the object side near an optical axis thereof. The fifth lens has refractive power weaker than those of the fourth lens and the sixth lens. The second lens has a specific Abbe's number.

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; a second lens; a third lens; 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 and a surface thereof on the object side have positive curvature radii near an optical axis thereof. The seventh lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius near an optical axis thereof. The seventh lens is formed in the shape so that the surface thereof on the image plane side is aspheric. The fourth lens has a specific focal length.

Abstract: 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; and a seventh lens having negative refractive power, arranged in this order from an object side to an image plane side. The seventh lens is formed in a meniscus shape near an optical axis thereof. The fourth lens has a specific focal length.

Abstract: An imaging lens includes a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, arranged from an object side to an image plane side. The imaging lens has a total of seven lenses. The first to seventh lenses are arranged respectively with a space in between. The first lens is formed in a shape so that a surface on the object side is convex near an optical axis. The third lens has a meniscus shape near an optical axis. The fourth lens is formed in a shape so that a surface on the image plane side is convex near an optical axis. The seventh lens is formed in a shape so that a surface on the image plane side has one inflexion point and is concave near an optical axis. The fourth lens has a specific Abbe's number.

Abstract: An imaging lens includes a first lens; a second lens; a third lens; 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 imaging lens has a total of seven lenses. The first to seventh lenses are arranged respectively with a space in between. The first lens is formed in a shape so that a surface on the object side is convex near an optical axis. The third lens is formed in a shape so that a surface on the object side is convex near an optical axis. The seventh lens is formed in a shape so that a surface on the image plane side has at least one inflexion point and is concave near an optical axis. The fourth lens and the fifth lens have specific Abbe's numbers.

Abstract: An imaging lens includes a first lens having at least one aspheric surface; a second lens having at least one aspheric surface; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens having at least one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces, arranged in this order from an object side to an image plane side respectively with a space in between. The imaging lens has a total of seven lenses. The first lens is formed in a shape so that a surface on the object side is convex near an optical axis. The seventh lens is formed in a shape so that a surface on the image plane side is concave near the optical axis. The fifth lens and the sixth lens have specific Abbe's numbers.

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 at least one aspheric surface and positive refractive power; a second lens having at least one aspheric surface; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens having at least one aspheric surface; a sixth lens having two aspheric surfaces; and a seventh lens having two aspheric surfaces and negative refractive power, arranged in this order from an object side to an image plane side respectively with a space in between. The imaging lens has a total of seven lenses. The fifth lens is disposed away from the sixth lens by a specific distance on an optical axis. The second 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 negative refractive power; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The first lens is formed in a meniscus shape near an optical axis thereof. The third lens is formed in a meniscus shape so that a surface thereof directing to the object side is convex near an optical axis thereof. The sixth lens is formed in a meniscus shape near an optical axis thereof.

Abstract: An imaging lens includes a first lens having positive refractive power; 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 first lens is formed in a meniscus shape near an optical axis thereof. The third lens is formed in a meniscus shape so that a surface thereof directing to the object side is convex near an optical axis thereof. The sixth lens is formed in a meniscus shape near an optical axis thereof.

Abstract: An imaging lens includes a stop; a first lens having positive refractive power; a second lens having negative refractive power; a third lens; 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 is formed in a meniscus shape near an optical axis thereof. The third lens is formed in a shape so that a surface thereof directing to the image plane side is concave near an optical axis thereof. The sixth lens is formed in a meniscus shape near an optical axis thereof.

Abstract: An imaging lens includes a first lens group; a second lens group; and a third lens group. The first lens group includes a stop, a first lens having positive refractive power, a second lens, and a third lens. The second lens group includes a fourth lens and a fifth lens. The third lens group includes a sixth lens and a seventh lens. The first to seventh lenses are arranged on an optical axis with a space in between respectively. The fifth lens is formed in a meniscus shape near an optical axis thereof. The seventh lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius. The surface of the seventh lens on the image plane side is formed in an aspheric shape having at least one inflexion point. The third lens has a specific Abbe's number.

Abstract: An imaging lens includes, in this order from an object side, an aperture stop ST, a positive first lens L1, a negative second lens L2 having a meniscus shape that directs a convex surface on the object side near an optical axis, a positive third lens L3, a positive fourth lens L4 having a meniscus shape that directs a concave surface on the object side near an optical axis, and a negative fifth lens L5 having a meniscus shape that directs a convex surface on the object side near an optical axis.

Abstract: An imaging lens includes, in this order from an object side, an aperture stop ST, a positive first lens L1, a negative second lens L2 having a meniscus shape that directs a convex surface on the object side near an optical axis, a positive third lens L3, a positive fourth lens L4 having a meniscus shape that directs a concave surface on the object side near an optical axis, and a negative fifth lens L5 having a meniscus shape that directs a convex surface on the object side near an optical axis.