Nippon Sheet Glass Company, Limited

Fuji Xerox Co., Ltd.

Shuya Ogi

Koichiro Iki

Takashi Fukuzawa

Minoru Toyama

Masahide Wakisaka

Kiyotaka Sasaki

Eiichi Nakaoka

Seiji Ohno

Tomitaka Takagi

There is provided a method of manufacturing an image sensor unit, the image sensor unit including: a linear light source that illuminates a document along a main scanning direction; a rod lens array that includes a plurality of rod lenses arranged in the main scanning direction and condenses a light reflected from the document; and a linear image sensor that receives a light condensed by the rod lens array. When a rod lens having an optically discontinuous portion on a surface and/or interior of the rod lens is included, the rod lens array is arranged such that the optically discontinuous portion is not located toward the document.

Image sensor unit with erecting equal-magnification lens array having a lens with optically discontinuous portion

An erecting equal-magnification lens array plate comprises first and second lens array plates stacked on one another, a fourth surface light-shielding wall, and an intermediate light-shielding wall. An intermediate through hole formed in the intermediate light-shielding wall is formed such that the hole diameter is progressively smaller in a tapered fashion away from the first lens array plate toward the second lens array plate. An angle of inclination &#x3b8; of an interior wall surface of the intermediate through hole with respect to a optical axis is given by&#x3b8;&#x2267;tan(4/(Gap+24))/2where Gap denotes a gap between the lens array plates, Ldenotes a thickness of the second lens array plate, Hdenotes a height of the fourth surface light-shielding wall, and Ddenotes a diameter of the opening of the fourth surface through hole formed in the fourth surface light-shielding wall facing the image plane.

Erecting equal-magnification lens array plate, optical scanning unit, image reading device, and image writing device

A method for driving a self-scanning light-emitting element array is provided in which two light-emitting elements may be illuminated simultaneously in one chip. In a self-scanning light-emitting element array including a transfer element array and light-emitting element array, a magnitude of the write signal for illuminating adjacent two light-emitting elements simultaneously is two times that of the write signal for illuminating one light-emitting element. The self-scanning light-emitting element array is composed of a plurality of self-scanning light-emitting element array chips arranged in a linear manner, and the two-phase clock pulses are applied commonly to the plurality of self-scanning light-emitting element array chips.

Self-scanned light-emitting device array, its driving method, and driving circuit

An aligning tool having a plurality of grooves formed side by side is provided; gradient index rod lenses are placed in alignment within the grooves at an average spacing of 1 &#x3bc;m-5 &#x3bc;m; the gradient index rod lenses are fixed to form an integral unit as they maintain the aligned state; thereafter the end faces of each rod lens are polished.

Rod lens array and a process for producing the same

An optical write-in head for obtaining a clear image even in printing at a relatively high recording density without generating strip-like irregularities in most cases. The optical write-in head applies light carrying image information to a photosensitive substance. The optical write-in head includes an array light source having a plurality of dot light sources, each of which selectively emits the light corresponding to the image information, and a lens array facing the array light source. The lens array has a plurality of lens elements which corresponds to the plurality of dot light sources respectively. An angular aperture &#x3b8; of each of the lens elements is set in a range of about 14&#xb0; to 18&#xb0;.

Optical write-in head, image forming apparatus using the same, and method for inspecting the apparatus

An aligning tool having a plurality of grooves formed side by side is provided; gradient index rod lenses are placed in alignment within the grooves at an average spacing of 1 &mgr;m-5 &mgr;m; the gradient index rod lenses are fixed to form an integral unit as they maintain the aligned state; thereafter the end faces of each rod lens are polished.

A miniaturized lens array for unity magnification imaging comprises a plurality of rod lenses arranged in one row. An arrangement pitch D of the rod lenses is defined to satisfy (2 m&plus;1)&middot;D&lE;2.1 mm or 2.5 mm. An angle of aperture &thgr; of the rod lens is defined to satisfy &agr;D/6&times;&lcub;n&middot;cos (&minus;&agr;/2/m)&plus;(4 m /&agr; &minus;1) &rcub;&lE;&thgr;&lE;&agr;D/2&times;(4/m /&agr; &minus;1) . The arrangement pitch D and angle of aperture &thgr; are defined in this manner, and it is therefore possible to obtain the lens array whose difference between a total width and effective lens width is equal to or smaller than 2.1 mm or 2.5 mm.

Lens array for unity magnification imaging, and image reading apparatus using the same array

Rod lens array

In an image forming apparatus, an object surface ( ) is disposed facing one end face of a rod lens array ( ), while an image surface ( ) is disposed facing the other end face thereof. A lens working distance of the rod lens array on the object side is substantially equal to that on the image side. An actual object-image distance Tco is set between the conjugate length TC1 at which the average value MTFave of the MTF of the rod lens array in the lens array direction is maximized and the conjugate length TC2 at which the &Dgr;MTF(&equals;(MTFmax&minus;MTFmin)/MTFave) is minimized, and a shift quantity &Dgr;TC(&equals;&verbar;TCo&minus;TC1&verbar;) is set within 0 mm<&Dgr;TC<&plus;02 mm for the conjugate length TC1 at which the MTFave is maximized.

Growing community of inventors

Osaka, Japan

Shuya Ogi