Canon Kabushiki Kaisha

Hakaru Muto

Asao Watanabe

Yuzo Kato

Sadasuke Kurahayashi

Shin Tsuda

Tetsuya Kobayashi

Yujiro Ando

Yasushi Takatori

Toshihiko Ochiai

Akio Noguchi

Isao Yamaguchi

Eihiro Sakaki

Shigeru Kameyama

Hiromi Kubota

Sadasuke Kurabayashi

The invention detects vibrations of a motor by a vibration detection means, compares the detected vibration detection value with a reference value using control means, and changes the voltage to be applied to each of coils of the respective excitation phases until the vibration detection value reaches the reference value, thereby controlling the excitation currents that flow through the coils of the respective excitation phases to reduce the vibrations of the motor.

Motor drive control apparatus and method, and image forming apparatus

An image forming apparatus has a fixing device for fixing an image formed on a recording medium, a device for detecting an operating environment of the image forming apparatus, a selecting device for selecting a fixing device temperature in accordance with a detection result, and a control device for controlling the temperature of the fixing device to a selected fixing device temperature. The image forming apparatus is capable of efficiently bringing out the functions of a print engine thereof at a minimum cost without the need for adding a new high-speed device, achieving a higher printing speed and ensuring a good fixing property regardless of the thickness of paper used, while preventing wasteful energy consumption and adverse influences by heat.

Image forming apparatus with fixing temperature control

An image recording apparatus includes a rotationally driven image carrier; a position signal output device for outputting a position signal indicating that the image carrier is at a predetermined rotational position; a scanning device for scanning a photosensitive drum with a light beam which is modulated in accordance with the image signal; a beam detection signal generating device for generating a beam detection signal upon detection of the light beam at a predetermined position, so as to regulate the timing of the light beam modulation by the image signal for each line of scan; an image transferring/superposing device for successively transferring and superposing on the image carrier a plurality of color image components which are successively formed on the photosensitive drum based on the image signals which are input in response to the position signals for formation of respective color image components; a measuring device for measuring the time difference between the position signal and the detection signal for each color image component, and a control device for controlling at least the rotation of the image carrier based on the time difference measured by the measuring device.

Image recording apparatus and image recording method

An image forming apparatus capable of forming a tone image including an image bearing member; electrically independent plural electrodes; a rotatable magnetic field generator having plural magnetic poles to supply magnetic toner particles to a region between the image bearing member and the recording electrodes; a detector for detecting the positions of the magnetic poles of the magnetic field generator; and a controller, responsive to an output of the detector, for controlling application timing of a voltage on the recording electrodes.

Image forming apparatus including rotatable magnetic field generating

The present invention permits an extension of a recording electrode used with a recording system in which a toner image is formed on a recording medium in response to the recording electrode by applying toner to a space between the recording medium and the recording electrode and by applying a voltage, without deteriorating an image quality. Each electrode member is constituted, by a plurality of conductive portions arranged in a longitudinal direction and a plurality of insulating portions for ensuring the electrical insulation between the adjacent conductive portions, and the recording electrode is constituted by connecting m electrode members with electrically connecting the adjacent conductive portions to each other. The present invention also provides a recording system using such recording electrode.

Recording electrode and image forming apparatus using the same

An image forming apparatus includes recording electrodes electrically isolated from each other, a recording medium movable relative to the recording electrodes and a developer supplying device for supplying a conductive developer into between the recording electrodes and the recording medium. The invention is particularly related to the removal of the developer from the recording medium. The amount of electricity produced in the means for removing the developer is detected, and in response to the detection, a bias voltage applied to the removing means is controlled.

Image forming apparatus

An image forming apparatus includes recording electrodes electrically isolated from each other; a recording medium movable relative to the recording electrodes; developer supplier for supplying a conductive developer into between the recording electrodes and the recording medium; developer remover contactable to the recording medium to remove the developer from the recording medium; humidity detector for detecting an ambient humidity; and a bias applying device for applying a different bias voltage to the developer remover in accordance with an output of the humidity detector.

In the transmission of binary image signals obtained by scanning of an original document, a high signal compression ratio without deterioration in image quality is achieved by subjecting the binary image signals to a selective thinning process in which the signals of a run-length within a determined range are converted into signals of a determined length and by subsequently coding thus selectively thinned signals. A further improved signal compression is also established without deterioration of image quality by conducting, prior to the selective thinning process, preliminary processes such as elimination of isolated dots in the image or smoothing in the principal and auxiliary scanning directions. Furthermore signal compression ratios are increased by preparing state signals representing the correlation between the first image signals present on a first scan line and the second image signals present on a second scan line to encode and transmit the first image signals and the state signals, and still to allow regeneration of the second image signals at the reception end. Transmission of signals either with coding of a high compression or with a coding of a higher popularity can also be achieved through simple switching of the coding system. Furthermore there is also provided effective thinning on graphic information which could not be easily handled with the conventional thinning processes.

Information processing apparatus

This invention relates to the reduction in time required for signal transmission in facsimile apparatus, and consists of a transmitting apparatus adapted for eliminating the signal indicating the line thickness from the binary image signal obtained by scanning the original to be transmitted and transmitting thus obtained band-compressed transmission signal, and a receiving apparatus adapted for adding a signal approximately equal to the above-mentioned signal indicating the line thickness to the above-mentioned transmission signal thereby forming received image.

Facsimile apparatus

A recording apparatus comprises a recording medium, a recording unit disposed in proximity to the recording medium for effecting recording on the recording medium by application of a voltage thereto, a first power source providing a voltage to be applied when recording is effected on the recording medium by the recording unit, a first switching unit provided between the recording unit and the first power source and being switchable in accordance with a voltage applied to its control terminal, a second power source having one end thereof connected to the junction between the switching unit and the first power source and effective to determine the voltage of a control signal applied to the control terminal, and an isolator for receiving recording signals to be applied to the switching unit.

Growing community of inventors

Yokohama, Japan

Hakaru Muto