Fujinon Corporation

Yoko Yamamoto

Yu Kitahara

Masao Mori

Toshiaki Katsuma

Makoto Oomura

Taro Asami

Hiromitsu Yamakawa

An image reading lens system of Example 1 includes six lenses having first to sixth lenses being arranged in order from an object side and an aperture diaphragm. In the image reading lens system, the first lens, the third lens, and the sixth lens are formed of negative lenses, and the second lens, the fourth lens, and the fifth lens are formed of positive lenses. The first lens, the second lens, the third lens, and the fifth lens are made of glass, and surfaces of all these lenses are formed of spherical surfaces. The fourth lens and the sixth lens are made of resin, and surfaces of the fourth lens and surfaces of the sixth lens are formed of aspheric surfaces. A cemented lens is formed of the second lens and the third lens with a cemented surface interposed therebetween, and is disposed adjacent to the aperture diaphragm.

Image reading lens system and image reading apparatus

An imaging lens includes, in order from an object side, a first lens having a negative power and including a concave image-side surface, a second lens having a positive power, a stop, a third negative lens, which is a biconcave lens, a fourth lens having a positive power, and a fifth lens having a positive power and including a convex image-side surface. The imaging lens satisfies the following conditional expressions:0.18&#x3c;(4+5)/&#x3c;0.44, and0.18&#x3c;1/where f denotes a focal length of an entire lens system, Ddenotes a thickness of a center of the first lens, Ddenotes a distance from an image-side surface of the second lens to the stop on an optical axis, and Ddenotes a distance from the stop to an object-side surface of the third lens on the optical axis.

Imaging lens and imaging apparatus

A wide-angle imaging lens comprises, in order from an object:

Wide-angle imaging lens

An image reading lens is provided and includes: in order from an object side of the image reading lens, a first lens of a negative lens having a meniscus shape directing a concave surface toward the object side thereof; a second lens having a biconvex shape; a stop; a third lens of a positive lens having a meniscus shape directing a convex surface toward an image side thereof; and a fourth lens of a negative lens having a meniscus shape directing a concave surface toward the object side thereof. The image reading lens satisfies the following conditional expressions:2.4&#x3c;3/&#x3c;3.50.007&#x3c;2/&#x3c;0.028where f represents a focal length of the image reading lens, frepresent a focal length of the third lens, and Drepresents a spacing between an image-side surface of the first lens and an object-side surface of the second lens.

Image reading lens and image reading apparatus

An image reading lens is provided and includes: in order from an object side of the image reading lens, a first negative lens having a meniscus shape; a second lens having a double-convex shape; an aperture stop; a third positive lens having a meniscus shape with a convex surface on an image side of the image reading lens; and a fourth negative lens having a meniscus shape with a concave surface on the object side.

A lens is equipped with a reference mounting surface that is abutted to a surface of a lens support member at the time of mounting the lens, wherein the reference mounting surface is arranged between a plane which is normal to the optical axis of the lens and includes a principal point on the incident light side of the lens and a plane which is normal to the optical axis of the lens and includes a principal point on the outgoing light side of the lens.

Lens with reference mounting surface

An image scanning lens includes, arranged in order from the object side, a first lens element having negative refractive power and a meniscus shape with its convex surface on the object side, a biconvex second lens element and a biconcave third lens element that are cemented together, a stop, a biconcave fourth lens element and a biconvex fifth lens element that are cemented together, and a sixth lens element having negative refractive power and a meniscus shape with its convex surface on the image side. The image scanning lens may include only these six lens elements. The image scanning lens satisfies certain conditions related to the focal lengths of the first lens element, the second and third lens elements together, the entire image scanning lens, radii of curvature of various surfaces, and anomalous dispersion of various lens elements. An image reader with an image pickup device, such as a CCD, uses the image scanning lens.

Image scanning lens and image reader that uses same

A coupling optical system for coupling light into an optical fiber of an optical communications system includes a liquid that includes a dispersion of microscopic particles and two transparent media that hold the liquid between them along an optical axis. The refractive power of the liquid is variable according to the electromagnetic field applied to the liquid to vary the migration of the microscopic particles of the dispersion within the liquid. The position of a light collecting point of the coupling optical system is adjustable based on the variation in the refractive power of the liquid so that light can be efficiently coupled into optical fibers at different distances along the optical axis from the coupling optical system. At the light collecting point, the end surface of an optical fiber collects light from a light source or another optical fiber. One or more collimator lenses may help converge the light.

Coupling optical system for optical communications

An image scanning lens includes four lens components that may include five lens elements as follows: a first lens element having negative refractive power and a meniscus shape with its convex surface on the object side, a second lens element having positive refractive power and a meniscus shape with its convex surface on the object side, a stop, a third biconcave lens element cemented to a fourth biconvex lens element, and a fifth lens element having negative refractive power and a meniscus shape with its concave surface on the object side. The image scanning lens satisfies certain conditions related to the focal lengths of the first, second, and third lens components of the image scanning lens and to the anomalous dispersion of the second lens element. An image scanning device, such as an image scanner, with an image pickup device, such as a CCD, uses the image scanning lens.

Image scanning lens and image scanning device that uses same

An image scanning lens includes four lens components, each of which may be a lens element. From the object side of the image scanning lens, the first lens component has positive refractive power and a meniscus shape with the convex surface on the object side, the second lens component has a biconcave shape, the third lens component has a biconvex shape, and the fourth lens component has negative refractive power and a concave surface on the object side and may be a meniscus lens or a biconcave lens component. The image scanning lens satisfies certain conditions related to the focal lengths of the first, second, and fourth lens components of the image scanning lens and to the relative partial dispersions of the lens elements. An image scanning device, such as an image scanner, with an image pickup device, such as a CCD, uses the image scanning lens.

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Fuchu, Japan

Yoko Yamamoto