Oki Electric Industry Co., Ltd.

Hiroshi Tohyama

Hiroshi Furuya

Atsushi Takahashi

Satoru Yamada

Yukio Nakamura

Hiroshi Hamano

Hiromi Takahashi

Yoshitaka Terao

Hideo Sawai

Mio Chiba

Shigeki Ogura

Yuji Terouchi

Hiromasa Kanno

Yuko Kasamura

Susumu Ozawa

Masao Ikehata

Yuuji Terouchi

An LED array chip comprises a semiconductor substrate having a front surface and a side surface. The first surface and the front surface come together at an end of the chip to define an end portion of said semiconductor substrate that has an acute angle between the first surface and the front surface. The end of the chip defines an outermost dimension of the chip. The first surface extends further away from the front surface than the diffuison depth of the light emitting elements. A method of manufacturing an LED array chip includes the steps of: forming grooves between adjacent LED arrays of the plurality of LED arrays, each of the grooves having opposing side walls each of which makes an acute angle with the front surface; and dicing the semiconductor wafer except for the opposing side walls of each of the grooves to separate the plurality of LED arrays into individual LED array chips.

LED array chip

Light emitted from an array of light-emitting elements in an electrophotographic printer is transmitted through a birefringent plate that deflects light polarized in a first plane but does not deflect light polarized in a second plane perpendicular to the first plane, and through a polarization switching device that is controlled by an electrical signal so as to selectably transmit light polarized in either the first plane or the second plane. The transmitted light illuminates a photosensitive medium. Each light-emitting element can illuminate two dots on the photosensitive medium, depending on the state of the polarization switching device, thereby doubling the dot resolution.

Double-resolution optical system for electrophotographic printer

A method is for driving a gas discharge type light emission apparatus having an electrode block line(s) constituted by electrode blocks. Scanning of adjacent cathodes, one being in one of two adjacent electrode blocks and the other being in the other electrode block, is effected such that subsequent to the scanning of one adjacent cathode, at least one cathode other than the other adjacent cathode is scanned prior to the scanning of the other adjacent cathode. By the method, crosstalk between adjacent electrode blocks is prevented without the provision of a partitioning member between the adjacent electrode blocks. A gas discharge type light emission apparatus includes an anode(s) on a front substrate and cathodes on a rear substrate. The anodes and cathodes face one another via a discharge gas medium to constitute discharge cells. The anodes are made of a light-blocking material and including windows at positions corresponding to the cathodes. The windows are also provided at positions corresponding to boundaries between adjacent anodes. By providing windows, discharge light emission having a clear shape and a high resolution can be obtained.

Gas discharge type light emission apparatus and method of driving the

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Tokyo, Japan

Hiroshi Tohyama