Hitachi, Ltd.

Ricoh Printing Systems, Ltd.

Akira Shimada

Shinya Kobayashi

Kazuhiro Wakamatsu

Toru Miyasaka

Masashi Yamamoto

Akira Sasaki

Takahiro Nakayama

Masaru Nakano

Masahiko Saito

Kenji Mori

Hiroyuki Tadokoro

Toshiya Satoh

Masayasu Anzai

Isamu Terashima

Shintaro Yamada

Shunichi Oohara

Tsuneaki Kawanishi

Kiyohiko Tanno

Masaharu Tadauchi

Katsumi Kumada

Shogo Matsumoto

Akiyoshi Hakoyama

Ryuuichi Shimizu

Kazuo Kikuchi

Nobuaki Fukasawa

Atsushi Onose

Tomoji Kitagishi

Syoji Sagae

Tetsuro Akasaki

Satoshi Narita

Hideo Hirane

Akiko Oikawa

Tatsunari Sato

Shin-ya Sato

Nobuo Tokoro

An image forming apparatus is able to form steady test-pattern toner images for calibration of reflection density detection characteristics with ample toner. The operation consists of forming a test-pattern toner image for calibration of the reflection density detection characteristics, which is formed of a plurality of toner images of different colors aside from a reference test-pattern toner image for controlling image forming conditions, detecting the detection characteristics of a reflection density sensor from the result of detection of the quantity of toner attached to the test-pattern toner image for calibration of the reflection density detection characteristics, and calibrating the output characteristics of the reflection density sensor.

Image forming apparatus and method of detecting the detection characteristics of a reflection density sensor

An organic light emitting element includes a transparent electrode, a light emitting layer and a metal electrode layer formed in that order. Further, a metal reflection film is formed on at least a side surface of the light emitting layer through an insulation film.

Organic light emitting element with insulation film and metal reflection film

An organic light emitting element comprising a substrate and a translucent reflection film, a transparent electrode, a hole transport layer, a light emitting layer and a metal electrode layered on the substrate in that order. At least the hole transport layer, the light emitting layer and the metal electrode are covered with an insulating film and a metal reflection film.

Organic light emitting element and method of producing the same

An image information changing part is added to correct image information of respective colors to be recorded according to information of errors among images to be combined so that color images may be combined exactly. An image recording method and an image recording apparatus having a high-speed, high-resolution and highly stable image combining method can be obtained.

Image recording method and image recording apparatus

An organic light emitting element including a light emitting organic thin film formed on a substrate, a pair of electrodes sandwiching the organic thin film light emitting layer therebetween. A peripheral side surface of the organic thin film light emitting layer has a shape so that emitted light is reflected by the side surface. The peripheral side surface of the organic thin film light emitting layer is in a range of about 40%-90% of a thickness of the organic thin film light emitting layer in a direction perpendicular to a surface of the substrate.

A picture image forming apparatus including a photoreceptor belt driven by a drive device, a plurality of developing devices for forming toner picture images on the photoreceptor belt, an intermediate transfer device, to a surface of which toner picture images on the photoreceptor belt are overlappingly transferred plural times when a picture image is to be formed on a single page, and a transfer roller for pushing a sheet against the intermediate transfer device in order to transfer toner picture images to the sheet. The intermediate transfer device is an intermediate transfer belt contacted by the photoreceptor belt to be driven thereby. A photoreceptor-side roller enables contact of the intermediate transfer belt and the photoreceptor belt, and the intermediate transfer belt is trained around the photoreceptor-side roller and a transfer-side roller for pushing the sheet against the transfer roller. A diameter d2 of the transfer-side roller is smaller than a diameter d1 of the photoreceptor-side roller.

Picture image forming apparatus with intermediate transfer belt trained around two rollers of different diameter

An image forming system including multiple photoconductors arranged in a line extending in a vertical direction and forming one body as one unit, and multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors. An image is transferred to a recording medium on an other side of the line of the multiple photoconductors.

Photoconductor unit and image forming system

A toner for use in a color electrophotographic system ensures a sufficient offset resistance without oil being supplied, and meets requirements for color development, transparency and durability to withstand commercial use. The toner for an electrophotographic system has a resin consisting of two or more resin mixtures having a different degree of crosslinking, the overall occupancy rate of mold releasing agent present as a domain in one particle of the toner is 1 to 10%, and the average dispersion diameter of the mold releasing agent is 10 to 50% of the toner particle diameter.

Electrophotographic toner, production method thereof and electrophotographic image forming system

An organic light emitting element, having a metal thin film on an upper surface of an organic thin film, is produced by mechanically cutting the metal thin film, using the cut metal thin film as a mask, and applying dry etching processing to the whole of the organic thin film and to a part of each of the thin films on the upper and lower surfaces of the organic thin film.

An image forming system having multiple photoconductors arranged in a line and forming one body as one unit, multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors, an intermediate transfer device arranged on the other side of the line of the multiple photoconductors and a form cassette arranged below the line of the multiple photoconductors. The image forming system further includes a transfer device and a fusing device arranged at an opposite side of the intermediate transfer device with respect to the line of the multiple photoconductors.

In order to provide an image forming system characterized by compact configuration, high speed printing, high picture quality recording and excellent maintainability without image misregistration, an image forming system is provided, wherein multiple photoconductors are arranged along one of the surfaces of the intermediate transfer belt which is elongated in the longitudinal direction, and a fusing device is located on the other surface, with the photoconductors being integrated in one unit.

An organic light emitting element having a metal thin film on an upper surface of an organic thin film, is produced by mechanically cutting the metal thin film, using the cut metal thin film as a mask, and applying dry etching processing to the whole of the organic thin film and to a part of each of the thin films on the upper and lower surfaces of the organic thin film.

Organic light emitting element with resonant structure

Image forming apparatus having a photosensitive drum 1, a charger 2 for uniformly charging the photosensitive drum 1, an exposing means 3 for forming an electro-static latent image on the photosensitive drum 1, an exposing unit 4 for forming a visual image by developing the electro-static latent image, a transfer roller for transferring the visual image to a printing medium 10, which comprises a transfer voltage supply circuit that supplies the transfer roller 5 one or more times with voltage in one polar direction and successively in the other polar direction during an interval after starting of operation of the image forming apparatus and before the time when the printing medium 10 is transported to the transfer roller 5. By controlling in such a way, an image forming apparatus is provided in which memory effect does not arise, the transfer roller 5 being prevented from having accumulated toner attached thereto, the toner attached to the transfer roller 5 being cleaned, and so the reverse side surface of the printing medium 10 is not stained.

Image forming apparatus having image transfer with toner cleaning

In an image forming apparatus using an electro-photographic process, using a plurality of colors of toner including black toner, a reflectance of a base medium on which a toner image is formed is higher than that of black toner itself and lower than that of color toner. A toner deposit amount sensor provided in the image forming apparatus has a light-receiving element provided in the regular reflection direction from a toner image on the base medium. The light-receiving element has a wide light-receiving area so as to receive at least a part of irregularly reflected light besides regularly reflected light. The light-receiving element is then stored in a container for preventing the element from being contaminated by scattered toner, except the time of toner deposit amount measurement. Measurement characteristics of the toner amount sensor are corrected when being stored in the container by using a correction plate provided in the container. Furthermore, the deposit amount of each color of toner is controlled by relations between image forming control parameters and the deposit amount of each color of toner is controlled by relations between image forming control parameters and the deposit amount of each one of the plurality of colors of toner and black toner, the relations being memorized in advance.

Image forming apparatus which measures deposit amounts of toner

A electrophotographic image fixing device fixes a toner image on a substrate. The substrate is passed between two pressing rollers disposed in opposition to each other to fix toner images on the substrate. The pressing rollers includes a surface constructed from an elastic material layer such that the elastic material layer can be deformed approximately 0.5-1.5% in terms of thickness. The pressing force against the toner applied side of the substrate is adjusted to 0.3-1 kg/cm.sup.2. As a result, an image with excellent toner fixing strength can be formed on a substrate such as an envelope without wrinkling the substrate during the fixing operation.

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Hitachi, Japan

Akira Shimada