Abstract: The present invention provides a zoom lens provided with, in order from an object side: a first lens group having a positive refractive power whose position on the optical axis is fixed during a zooming operation and a focusing operation; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a negative refractive power; and a sixth lens group having a positive refractive power. The first lens group includes a reflection optical element. At least the fifth lens group is used for focusing on an object at a finite distance. The maximum lateral magnification of the predetermined lens groups between a wide-angle end and a telephoto end of the zoom lens and focal lengths of the zoom lens satisfy a predetermined condition.

Abstract: A zoom lens including a first lens unit exhibiting a positive refractive power and always being statically positioned along an optical axis when a power of the zoom lens is varied or the focusing is conducted and including a reflective optical element for bending an optical path, a second lens unit exhibiting a negative refractive power and including a negative lens, a negative lens and a positive lens, along the optical axis in this order from an object side, a third lens unit exhibiting a positive refractive power, a fourth lens unit exhibiting a positive refractive power, and including at least two positive lenses, and a fifth lens unit exhibiting a negative refractive power, wherein the second lens unit, the fourth lens unit and the fifth lens unit are moved for varying the power of the zoom lens.

Abstract: The present invention provides a zoom lens provided with, in order from an object side: a first lens group having a positive refractive power whose position on the optical axis is fixed during a zooming operation and a focusing operation; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; a fifth lens group having a negative refractive power; and a sixth lens group having a positive refractive power. The first lens group includes a reflection optical element. At least the fifth lens group is used for focusing on an object at a finite distance. The maximum lateral magnification of the predetermined lens groups between a wide-angle end and a telephoto end of the zoom lens and focal lengths of the zoom lens satisfy a predetermined condition.

Abstract: An image pickup lens for forming image of a subject on a solid-state image pickup element includes: a first lens having a positive refractive power in a meniscus shape whose convex surface faces to an object side of the image pickup lens; an aperture stop; a second lens having a positive refractive power in a meniscus shape whose convex surface faces to an image side of the image pickup lens; a third lens having a negative refractive power whose concave surface faces to an object side of the image pickup lens. The first lens, the aperture stop, the second lens and the third lens are arranged in this order form an object side of the image pickup lens. The first lens and the third lens satisfy a predefined conditional expression.

Abstract: An image pickup lens for forming a subject image on an photoelectric converter of a solid-sate image pickup element, includes: an aperture stop; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power. The aperture stop and the first to fourth lenses are arranged in this order from an object side of the image pickup lens, and the image pickup lens satisfies predefined condition.

Abstract: A zoom lens including a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power and a fifth lens group having a negative refractive power, in an order from an object; wherein a variable power from a wide angle end to a telephoto end is performed by changing distances among the respective lens groups, and the fourth lens group comprises a three cemented lens comprising a positive c1 lens, a negative c2 lens, and a positive c3 lens from an order from the object.

Abstract: An image-capturing lens includes a plastic lens formed with use of a material in which particles each having the maximum length of 30 nanometer or less are dispersed in a plastic material.

Abstract: An image pickup lens for forming image of a subject on a solid-state image pickup element includes: a first lens having a positive refractive power in a meniscus shape whose convex surface faces to an object side of the image pickup lens; an aperture stop; a second lens having a positive refractive power in a meniscus shape whose convex surface faces to an image side of the image pickup lens; a third lens having a negative refractive power whose concave surface faces to an object side of the image pickup lens. The first lens, the aperture stop, the second lens and the third lens are arranged in this order form an object side of the image pickup lens. The first lens and the third lens satisfy a predefined conditional expression.

Abstract: An image pickup lens for forming a subject image on an photoelectric converter of a solid-sate image pickup element, includes: an aperture stop; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power. The aperture stop and the first to fourth lenses are arranged in this order from an object side of the image pickup lens, and the image pickup lens satisfies predefined condition.

Abstract: An imaging lens includes sequentially, from an object side, a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes only a first lens having a meniscus shape with a concave surface facing the object side. The second lens group has positive refracting power as a whole and includes sequentially, from the object side, a second-first lens having positive refracting power and a second-second lens cemented to or separated from the second-first lens and having negative refracting power. The third lens group includes only a third lens having a meniscus shape with a concave surface facing the object side. The fourth lens group includes only a fourth lens.

Abstract: An image-capturing lens includes a plastic lens formed with use of a material in which particles each having the maximum length of 30 nanometer or less are dispersed in a plastic material.

Abstract: A zoom lens including a first lens unit exhibiting a positive refractive power and always being statically positioned along an optical axis when a power of the zoom lens is varied or the focusing is conducted and including a reflective optical element for bending an optical path, a second lens unit exhibiting a negative refractive power and including a negative lens, a negative lens and a positive lens, along the optical axis in this order from an object side, a third lens unit exhibiting a positive refractive power, a fourth lens unit exhibiting a positive refractive power, and including at least two positive lenses, and a fifth lens unit exhibiting a negative refractive power, wherein the second lens unit, the fourth lens unit and the fifth lens unit are moved for varying the power of the zoom lens.

Abstract: An image-capturing lens includes a plastic lens formed with use of a material in which particles each having the maximum length of 30 nanometer or less are dispersed in a plastic material.

Abstract: A picture-taking lens for forming an image of an object image on a solid picture-taking element, comprising in order from the object side: a first lens having a positive refractive power and directing a convex surface toward the object side; an aperture stop, a second lens having a positive refractive power and a meniscus shape directing a convex surface toward the image side; and a third lens having a negative refractive power and directing a concave surface toward the image side, wherein the picture-taking lens satisfies the following conditional expression: 0.20<R1/f<0.42, 0.10<D2/f<0.40, where R1 is a radius of curvature of the object side surface of the first lens, D2 is an air gap on the axis between the first lens and the second lens, f is a focal length of a whole system of the picture-taking lens.

Abstract: An image pickup lens includes: a first lens which is a positive lens having a positive refractive power; a second lens which is a negative lens having a negative refractive power; a third lens which is a positive lens; a fourth lens having at least one surface with an aspherical shape, wherein the first lens, the second lens, the third lens and the fourth lens are arranged from an object side of the image pickup lens in this order and the image pickup lens is designed using a predefined condition.

Abstract: An image pickup lens includes: a first lens which is a positive lens having a positive refractive power; a second lens which is a negative lens having a negative refractive power; a third lens which is a positive lens; a fourth lens having at least one surface with an aspherical shape, wherein the first lens, the second lens, the third lens and the fourth lens are arranged from an object side of the image pickup lens in this order and the image pickup lens is designed using a predefined condition.

Abstract: An image pickup apparatus comprises a substrate; an image pickup element to convert a converged light flux to electronic signals; an image-taking optical element positioned so as to converge a light flux from an object onto the image pickup element; a light shielding member to house the image pickup element and the image-taking optical element; a controlling device to control an output of the electronic signals and controlling the image pickup element; and a refracting power-variable optical element.

Abstract: An image-capturing lens includes a plastic lens formed with use of a material in which particles each having the maximum length of 30 nanometer or less are dispersed in a plastic material.

Abstract: An image pickup lens includes in order from an object side of the image pickup lens: a first lens having positive refractive power whose convex surface faces the object side of the image pickup lens; an aperture stop; a second lens having positive refractive power whose convex surface faces an image side of the image pickup lens; and a meniscus shaped third lens having negative refractive power whose concave surface faces the image side of the image pickup lens, wherein the image pickup lens satisfies the following conditional expressions: 0.8<f1/f<2.0 ??(1) 20<((?1+?2)/2)??3<70 ??(2) where f1 is a focal length of the first lens, f is a focal length of a total system of the image pickup lens, and ?1, ?2 and ?3 are the Abbe constants of the first to third lenses respectively.

Abstract: An imaging lens includes sequentially, from an object side, a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes only a first lens having a meniscus shape with a concave surface facing the object side. The second lens group has positive refracting power as a whole and includes sequentially, from the object side, a second-first lens having positive refracting power and a second-second lens cemented to or separated from the second-first lens and having negative refracting power. The third lens group includes only a third lens having a meniscus shape with a concave surface facing the object side. The fourth lens group includes only a fourth lens.