Canon Kabushiki Kaisha

Seiji Uchiyama

Makoto Takeuchi

Akio Noguchi

Yukihide Ushio

Yoji Serizawa

Kazuro Yamada

Shimpei Matsuo

Hiroshi Mano

Masaki Ojima

Takashi Kawana

Kaoru Seto

Junichi Kato

Tetsuo Saito

Atsushi Kashihara

Hiromichi Yamada

Masahiro Goto

Koichi Hiroshima

Shinichi Tsukida

Takahiro Inoue

Koichi Suwa

Manabu Takano

Hiroshi Atobe

Hiroshi Sasame

Masaharu Ohkubo

Kazushi Watanabe

Atsushi Numagami

Akihiko Takeuchi

Akira Kuroda

Minoru Hayasaki

Aoji Isono

Toshio Miyamoto

Michio Uchida

Yuki Nishizawa

Katsunori Yokoyama

Michio Itoh

Yukio Inagi, Isaka

Daisuke Murata

Kazurou Yamada

Shinpei Matsuo

Youji Serizawa

Kenichi Fujii

Yoshihiro Ito

Yoichiro Maebashi

Takashi Soya

Michio Ito

Hiroyuki Nakamura

Toshiki Nakayama

Toshio Yoshimoto

Hiroki Tezuka

Hiromiichi Yamada

A fixing device configured to fix an image on a recording material, includes: a rotary member including an electroconductive layer; a coil which has a spiral shaped portion and is disposed in the inside of the rotary member; and a core disposed in the spiral shaped portion; with magnetic resistance of the core being, with an area from one end to the other end of the maximum passage region of the image on the recording material regarding the generatrix direction, equal to or smaller than 30% of combined magnetic resistance made up of magnetic resistance of the electroconductive layer and magnetic resistance of a region between the electroconductive layer and the core.

Image fixing device

An image forming apparatus is provided in which, by detecting an image formed on a recording medium, at least one of the density and chromaticity of the image can be properly controlled. The image forming apparatus includes an image forming unit for forming a toner image on an image carrier, a transfer unit for transferring the toner image formed by the image forming unit onto a transfer material in a transfer position, a fusing unit for fusing the toner image transferred by the transfer unit on the transfer material, a feed-direction changing unit for changing over a feed direction of the transfer material so that the transfer material having the toner image fused by the fusing unit is reversed and fed to the transfer position, a detecting unit for detecting, in a predetermined detecting position, the toner image fused on the transfer material by the fusing unit, and a control unit for controlling the image forming unit based on result detected by the detecting unit.

Image forming apparatus which performs image formation control based on the image after fixing

In an optical printer which performs image recording by using plural laser beams, there is a case where abnormality can not be normally confirmed even if a test pattern is recorded. In order to prevent such a problem, an electrophotographic apparatus is provided to drive each of the plural laser beams according to inputted image data, and to perform scanning on scan paths mutually different on an identical recording medium with the plural laser beams. In this apparatus, any one of the plural laser beams is driven within a predetermined area to record the test pattern.

Electrophotographic apparatus and test pattern recording method

An output apparatus capable of receiving multi-level dot information of a first recording dot density, generating multi-level dot information of a second recording dot density, and transmitting the thus-generated second dot information in a visible way. The output apparatus comprises: a receiving device capable of receiving multi-level dot information of a first recording dot density; a generating device capable of generating multi-level interpolation dot information by applying a predetermined calculation to the thus-received multi-level dot information; and a dot density conversion device capable of generating multi-level dot information of a second, higher recording dot density from said interpolation dot information and the received multi-level dot information, whereby high density image data can be generated from low density image data.

Dot image data output apparatus

An output apparatus capable of receiving multi-level dot information of a first recording dot density, generating multi-level dot information of a second recording dot density, and transmitting the thus-generated second dot information in a visible way. The output apparatus comprises: a receiving device capable of receiving multi-level dot information of a first recording dot density; a generating device capable of generating multi-level interpolation dot information by applying a predetermined calculation to the thus-received multi-level dot information; and a dot density conversion device capable of generating multi-level dot information of second higher recording dot density from said interpolation dot information and the received multi-level dot information, whereby high density image data can be generated from low density image data.

Dot image output apparatus

An electrical connector electrically connectable with a main assembly connector, provided in a main assembly of an electrophotographic image forming apparatus includes storing member for storing information; a plurality of electrical contacts for separably connecting with a contact of the main assembly connector, when they are connected electrically with the main assembly connector; wherein the storing member is electrically connected with each of the electrical contacts with lead lines.

Electrical connector, process cartridge and electrophotographic image

A laser beam printer which detects the position of a laser beam in order to scan a photosensitive member. The laser beam is detected at a predetermined position, wherein the laser beam is detected at a time during which a rotating polygon mirror is rotating at a speed less than a predetermined speed. Laser beam detection signals are then output. A timing of the output of the detection signals is predicted, wherein the detection signals are not output at a constant interval because the rotating polygon mirror is rotating at a speed less than the predetermined speed. A signal to turn on the laser beam is generated based on the predicted timing. In another aspect, a line for the detection signals is completed or broken at a timing based on an output interval of the detection signals.

Timings of rotational speed in a laser beam printer

In a laser beam printer, automatic optical quantity (APC) control is performed based on an optical quantity detection output to generate a laser beam having a predetermined quantity of light. In each scanning cycle, APC is effected by utilizing a period (unblanking period) in which the laser device is forcibly actuated to generate a horizontal synchronization signal. The unblanking period may be changed according to the print paper size or image formation/non-image-formation periods. Also, light quantity control may be effected through a plurality of scanning cycles before image formation and may be effected by utilizing the unblanking period during the period corresponding to the intervals of print sheets. Techniques also provided to prevent a transfer unit from being contaminated by toner images formed as a byproduct of APC.

Image recording apparatus using optical beam for applying a transfer

The present invention provides a process cartridge removably mounted to an electrophotographic image forming apparatus. The process cartridge includes; a cartridge frame, an electrophotographic photosensitive member provided within the cartridge frame, a process device for acting on the electrophotographic photosensitive member, a memory device for storing information to be transmitted to the electrophotographic image forming apparatus, a positioning portion for positioning the cartridge frame with respect to the image forming apparatus when the process cartridge is mounted to the image forming apparatus, and an exposure opening provided in the cartridge frame and to pass information light from the image forming apparatus to be illuminated on the electrophotographic photosensitive member when the process cartridge is mounted to the image forming apparatus.

Process cartridge and electrophotographic image forming apparatus

The present invention is structured in such a manner that, when multivalued pixel data which constitutes a multivalued image are supplied, a predetermined number of interpolated pixel data are generated and inserted between the supplied and successive pixels. At this time, the gradient of each of the interpolated pixels is calculated and determined in accordance with the gradient of the supplied neighboring multivalued pixels. Thus, the image is recorded on a recording medium in accordance with image data including the interpolated pixel. As a result, print information processed so as to be printed by a low resolution printer can be printed with the same size and high quality as when printed by a high resolution printer according to the present invention.

Image recording apparatus

Image recording with adaptation of resolution to printer

A data processing apparatus includes an image data generating section for generating image data, and an interpolation image data forming section for forming and outputting interpolation image data based on the image data generated by the image data generating section. The interpolation image data forming section includes a memory for storing the image data generated by the image data generating section.

Data processing apparatus

An image forming apparatus which converts character or pattern information into bit map information (pixel information) and forms an image based thereon. The image forming apparatus includes a light-beam generator for generating a modulated light beam, a light-beam deflector for scanning an image carrier, a device for feeding a sheet to registration rollers and a driver for driving the image carrier. A time period is provided to operate the light-beam deflector and the feeding device before the driver starts to drive the image carrier to form an image.

Image forming apparatus with image carrier and sheet feed drive control

Growing community of inventors

Tokyo, Japan

Seiji Uchiyama