Kyocera Corporation

Other

Hitachi, Ltd.

Takao Kawamura

Yasuo Nishiguchi

Yoshio Ozawa

Keijiro Minami

Susumu Kikuchi

Hisashi Mukataka

Naooki Miyamoto

Tsuyoshi Yasutomi

Ryoichi Shiraishi

Hiroshi Itoh

Akira Sasaki

Shunji Murano

Akiyoshi Hakoyama

Masafumi Suzaki

Katsumasa Mikami

Yukio Ikeda

Yoshihito Takahashi

Katsuhiro Yoshioka

Masakazu Hoda

Keijirou Minami

Hideaki Iwano

Chiaki Matsuyama

Hiromitsu Tajiri

Shinji Yamane

Yoshikazu Nakayama

Hisao Arimune

Takashi Maeda

Hitoshi Takemura

Takeo Honma

Ryushi Imoo

Hisashi Higuchi

Toshihiro Anzaki

Motokazu Ogawa

Yuuji Kurazono

Mitsuo Miyazaki

Masayuki Tone

Shigeki Tsukahara

Keibun Ejima

Sadayuki Orito

Moriyuki Arai

Sigeki Tsukahara

A magnetic carrier for use in a developer for developing latent electrostatic images is composed of magnetic carrier particles with a particle size of 35 .mu.m or less in an amount of 15 wt. % or more, and a developer is composed of the above carrier and a toner. An image formation method is composed of the steps of (a) uniformly charging the surface of a photoconductor to a predetermined polarity, (b) forming latent electrostatic images including low potential portions and high potential portions on the photoconductor by subjecting the charged surface of the photoconductor to selective light radiation corresponding to light images, thereby selectively reducing the potential of the surface of the photoconductor, and (c) developing the thus formed latent electrostatic images to visible toner images by bringing the developer into contact with the latent-electrostatic-images-bearing photoconductor.

Magnetic carrier developer comprising the carrier for developing latent

Magnetic carrier and developer comprising the carrier for developing

A granular charging agent capable of injecting the electric charge into a material to charge the surface of the material when coming in contact with the material with the application of a voltage to the charging agent, comprising magnetic particles which comprise electroconductive magnetic particles and high-resistivity magnetic particles of which resistivity is higher than that of the electroconductive magnetic particles. A granular charging agent may comprise magnetic particles, each magnetic particle comprising an electroconductive surface portion capable of forming a flow path of electric current and a surface portion with a resistivity higher than that of the electroconductive surface portion. In addition, a method of charging a material such as a photoconductor using the above-mentioned granular charging agent is disclosed.

Granular charging agent and charging method and image forming method

An optical print head in an image forming apparatus includes linearly arranged blocks and integrated circuits for driving disposed at one or both ends of the line of blocks. Each of the blocks includes a plurality of light emitting diodes. Positionally corresponding light emitting diodes in each block are connected to one of a plurality of meandering individual signal lines which are connected to the integrated circuits and each block is further connected to a corresponding common signal electrode to which power is selectively applied, thereby making possible illumination and drive of light emitting diodes in each block. The head may include a housing containing the blocks, individual signal lines and common signal electrodes and further include a flexible substrate located outside of the housing connected to and supplying power to the common signal electrodes.

Image forming apparatus having driving means at each end of array and

A particle charging apparatus for charging a photo-sensitive drum by magnetically holding magnetic particles in a charging zone and impressing a charging bias on the magnetic particles. Adjacent to an opposed pole which is disposed on the back side of the photo-sensitive drum on the charging zone upstream side for forming a vertical magnetic field, an opposite polarity magnet or magnetic member is disposed such that a mainly horizontal magnetic field is formed on the drum by the opposed and adjacent poles. A vertical magnetic field is formed on the charging zone downstream side by a main pole and the opposed pole. A non-magnetic sleeve with the main pole therein is rotated in the direction opposite that of the drum, thus causing magnetic particles in the vertical magnetic field to be circulated toward the charging zone upstream side. Leakage and spattering of magnetic particles out of the charging zone is effectively prevented by simple construction, and stable charging is permitted even with a reduced photo-sensitive drum size or with assembling errors of a charging sleeve or the like.

Charging apparatus for charging a photo-sensitive member by magnetically

This invention relates to an image forming apparatus based on the electrophotographic process, more particularly to the image forming apparatus having an exposure member inside of a photoreceptor member, which develops upon receiving light exposed with the exposure member. The image forming apparatus features to include the exposure member having a plurality of LED elements arrayed along a main scanning line of the photoreceptor member which is exposed with the LED elements in a time sharing manner by n bits unit, and the photoreceptor means having the photoconductive layer formed of amorphous silicon compounds for receiving the light. The photoreceptor member is electrified through brushing contact of the developer carried by the toner support member, and wherein the exposure portion of the exposure means is located in the developer brushing contact region.

Rear side exposure type electrographic image forming apparatus

Electrophotographic sensitive member

An electroconductive magnetic carrier which is composed of basic particles, each of the basic particles comprising a binder resin and a magnetic material dispersed in the binder resin, and an electroconductive layer formed on the surface of the basic particle, a developer which is composed of the above electroconductive magnetic carrier and (b) an electrically insulating toner, and an image formation method of forming toner images on a photoconductor by using this developer are described.

Electroconductive magnetic carrier, developer using the same and image

Disclosed is a magneto-optical recording element comprising a dielectric layer and an amorphous perpendicular magnetization film on a substrate, wherein the perpendicular magnetization film is a perpendicular magnetization film comprising at least Gd element as the rare earth metal element and Fe metal as the transition metal component, in which the Fe sub-lattice moments are dominant, the dielectric layer is a dielectric layer composed of amorphous silicon nitride, the magnetization Ms of the perpendicular magnetization film is set within a range represented by the following formula (1):

Magneto-optical recording element

The face pressure distribution shape of the graze portion of the thermal head is made to be consistent with the temperature distribution shape of the graze portion of the thermal head. The temperature distribution shape of the graze portion of the thermal head is made to be consistent with the face pressure distribution shape of the graze portion of the thermal head. The graze portion of the thermal head is formed projectingly in two steps, and the heating resistor element of the thermal head is provided on the top portion of the graze portion of the thermal head. A thermal transfer printer having no ink void and no ink transfer unevenness can be obtained.

Thermal transfer printer having an improved thermal head to improve ink

A parallel circuit which is composed of a plurality of series circuits connecting photodetectors to reading switches in series is connected to an input terminal of an operational amplifier. Both a feedback switch and a feedback capacitor are connected in parallel to the operational amplifier. The reading switches and the feedback switches are turned on/off alternately, and then an output of the operational amplifier associated with the operation of reading switches turned on is input to one of input terminals of a differential amplifier, and the output of the operational amplifier associated with the operation of the reading switches turned off is input to the other input terminal of the differential amplifier to obtain the reading signal with noise absorbed.

Reading apparatus with improved performance

In a thermal head comprising a ceramic substrate, a glaze layer partially formed on the ceramic substrate, heat-generating resistors and electrodes connected to both the ends of the heat-generating resistors, if the width of individual electrodes located outside the glaze layer is made narrower than the width of corresponding electrodes on the glaze layer, formation of a short circuit between adjacent individual electrodes because of the presence of voids on the ceramic substrate can be effectively prevented.

Thermal head

In an IC-loaded thermal head, a flip chip is used as IC, and respective terminals of IC elements are directly connected by wireless bonding to terminals of heat generators of the head and terminals for external connection.

A thin film type thermal head includes a head substrate member, a partial projected glaze portion mounted on the head substrate member, a plurality of heating resistor elements provided on the partial projected glaze portion with each of the heating resistor elements having a uniform thin thickness and two electrode end portions. A common electrode is provided on the partial projected glaze portion and an individual control electrode is also provided on the partial projected glaze portion. The partial projected glaze portion has at least two projected portions of different height with the plurality of heating resistor elements having a portion thereof disposed on at least the highest projected portion of the partial projected glaze portion with both electrode end portions of each of the heating resistor elements being disposed on the partial projected glaze portion other than the highest projected portion of the partial projected glaze portion so as to enable a recording dot to become narrow in the printing direction.

Growing community of inventors

Tokyo, Japan

Yasuo Nishiguchi