Canon Kabushiki Kaisha

Takaomi Uezono

Hiroyuki Yamazaki

Atsushi Iwasaki

Takaaki Tsuruya

Minoru Hayasaki

Go Araki

Teruhiko Namiki

Satoshi Murasaki

Takao Kawazu

Yasuhisa Matsumoto

Hidenori Kanazawa

A fixing unit includes a rotary member that includes a conductive layer, a magnetic core inserted in an interior space of the rotary member, and an energizing coil that includes a conductor and that is wound helically around a circumference of the magnetic core. In a case where a distance between a first cross section of the conductor in a plane along the longitudinal direction and a second cross section of the conductor in the plane and adjacent to the first cross section in the longitudinal direction is L1 (mm), and a distance between the conductor and the magnetic core in a radial direction orthogonal to the helical axis is L2 (mm), following inequalities are satisfied, L1>0.1 and 0.1<L2<2.0.

Fixing unit and image forming apparatus

A heater for use in an image heating apparatus includes a substrate, first and second conductors provided on the substrate, and heating elements. The heating elements are arranged between, and electrically connected in parallel to, the first and second conductors. When n denotes a number of heating elements, connected to one second conductor, in one row of the heating elements, a width L denotes a sum (n×Wh) of widths, as seen in a longitudinal direction of the substrate, of shortest current paths of all respective heating elements connected to the one second conductor plus a sum of widths, as seen in the longitudinal direction, of respective gaps between adjacent shortest current paths, and a ratio R denotes a ratio of the sum (n×Wh) of widths to the width L, the heating elements are configured so as to satisfy 0.54≤the ratio R<1.

Heater and image heating apparatus

An image forming apparatus includes: a specification unit configured to perform surface specification processing for specifying a reflective surface that deflects light; a correction unit configured to perform correction processing for correcting image data in accordance with which reflective surface deflects light; and a control unit configured to control so as to cause scanning of a first photosensitive member to start before the surface specification processing completes, and control so as to, after the surface specification processing completes, cause the correction processing to be performed, with respect to image data for causing light to be emitted from a second light source and in accordance with a specification result of the surface specification processing, and cause scanning of the second photosensitive member to start.

Image forming apparatus performing processing in accordance with reflective surface of rotating polygonal mirror for scanning photosensitive member

An image forming apparatus includes: a photosensitive member; an exposure unit configured to divide one pixel into a plurality of pixel pieces and perform exposure on a pixel piece-by-pixel piece basis, to form an electrostatic latent image on the photosensitive member; a determination unit configured to determine, based on image data, an isolated pixel surrounded by blank pixels in the electrostatic latent image; a selection unit configured to select a correction target pixel from the blank pixels surrounding the isolated pixel; and a correction unit configured to correct the image data so as to expose a pixel piece of the correction target pixel.

Image forming apparatus that divides one pixel into plurality of pixel pieces and performs exposure on pixel piece-by-pixel piece basis

An opening and closing portion is opened and closed. A switch is turned off when a voltage applied to a drive terminal is smaller than a first voltage and to be turned on when the voltage is greater than or equal to a second voltage. A drive unit generates a drive voltage. A first line applies the drive voltage to the switch. A second line is arranged such that at least a part thereof is near the first line. A voltage drop element provided on the first line drops a voltage applied from the second line through the first line to the drive terminal when the first line and the second line short-circuit in a state where the portion is open, to lower the voltage applied to the drive terminal to be smaller than the first voltage.

Interlock mechanism in image forming apparatus and electrical device

An apparatus includes a CPU, wherein, when the apparatus is currently in a power OFF state, and if an operation different from that of a power source switch is performed, the CPU connects a load to a power source by the switch to discharge a capacitor.

Image forming apparatus for discharging electric charge charged to a capacitor and discharge device for discharging electric charge charged to a capacitor

In an electrophotographic image forming apparatus employing a contact development system, contact of a development roller against a photosensitive drum is started while forming an electrostatic latent image of a detection pattern for detection in each individual apparatus, and a developed toner image is detected at a predetermined position. At this time, a time from the time when contact of the development roller was started until the time when the toner image was detected is measured, and a delay time from a time when contact operation of the development roller was started until a time of actual contact is calculated by subtracting the time needed until the developed toner image reaches the detection position. The time when contact of the development roller is started is delayed by this time. The same sort of control is also performed for the separation time.

Growing community of inventors

Suntou-gun, Japan

Takaomi Uezono