Canon Kabushiki Kaisha

Isami Itoh

Tomohito Ishida

Tatsuya Tada

Takeshi Ikeda

Yukio Nagase

Yasukazu Ayaki

Tetsuya Atsumi

Masatsugu Toyonori

Sumito Tanaka

Nobuyuki Itoh

Tatsuomi Murayama

Sho Ikemoto

Nobuyuki Ito

Kenichi Takeda

Takeshi Yamamoto

Kazuhisa Kemmochi

Goro Noto

Masao Nakano

Yasushi Hozumi

Makoto Nonomura

An information processing apparatus, which communicates with an image forming apparatus and a reader, including: a display; and a controller configured to: obtain read image data output from the reader; determine an error of the read image data based on the read image data and reference data; cancel image forming operation of the image forming apparatus in a case where the error is determined in succession a predetermined number of times; cancel reading operation of the reader in the case where the error is determined in succession the predetermined number of times; notify, on the display, the cancellation of the image forming operation and the reading operation in the case where the error is determined in succession the predetermined number of times; and receive a user's instruction information about the predetermined number of times.

Information processing apparatus with automatic detection and interruption of defective image forming operations

An image forming apparatus includes an image processor configured to perform image processing on image data based on a conversion condition to output converted image data; an image forming unit configured to form an image based on the converted image data output from the image processor, the image forming unit being controlled based on an image forming condition; and a controller configured to perform tone correction control, density evenness control, and total density control, which is a combination of the tone correction control and the density evenness control. In the tone correction control, the controller controls the image forming unit to form a test image on a sheet and obtains reading data related to the test image on the sheet.

Image forming apparatus

An image forming apparatus comprises an output unit to output output data converted from input data by a halftone process with a first or second matrix in accordance with attribute information on pixels of the input data. The thresholds in the first matrix, whose thresholds are arranged to express the tone level of output data by the number of dots or dot area modulation for input data, and the second matrix, whose thresholds are arranged to express the tone level of output data by dot area modulation for the input data, are arranged such that the average dot size of output data obtained by the halftone process with the second matrix on input data with the first density is smaller than the average dot size of output data obtained by the halftone process with the first matrix on the input data with the first density.

Image forming apparatus, image forming method, and storage medium

The present image forming apparatus, upon accepting, in accordance with a user input, an instruction for execution of processing for adjusting an image forming condition, forms a predetermined test pattern on a sheet, and detects the density of the predetermined test pattern. Furthermore, the image forming apparatus obtains an area ratio of halftone dots in a highlight region of a formed image from the detected density, and, based on the area ratio of halftone dots, decides a smallest dot size for a screen that represents a halftone of the highlight region by a dither pattern.

Image forming apparatus, method for controlling same, and storage medium

An image forming apparatus forms a measurement image, controls a sensor to measure light reflected from a first area of an intermediate transfer member, controls the sensor to measure light reflected from a measurement image, and controls the sensor to measure light reflected from a second area of the intermediate transfer member. The apparatus determines first information relating to a tendency of the measurement results of the first area, determines second information relating to a tendency of the measurement results of the second area, and selects a computational equation for computing a correction value of a measurement result of the measurement image. The apparatus generates a correction value. The apparatus adjusts an image forming condition.

Image forming apparatus that adjusts image forming conditions

An image forming apparatus includes temperature sensors that measure temperatures at different locations in the longitudinal direction of a photosensitive drum. The image forming apparatus also includes an image processing circuit configured to change an exposure condition in the longitudinal direction of the photosensitive drum based on measured values obtained by the temperature sensors. A related image forming method includes calculating a temperature at a third location between the first and second location based on the measured temperatures at the first location and the second location, and controlling an exposure condition for exposure at the third location in accordance with image information, including changing the exposure condition for the exposure at the third location based on the calculated temperature at the third location.

Image forming apparatus that measures temperatures at first and second locations and that changes the exposure condition for exposure at a third location based on the measured temperatures, and corresponding image forming method

Image forming apparatus that measures temperatures at a first location and a second location different from the first location in a longitudinal direction of a photoconductor, and that changes an exposure at a third location between the first and second locations based on respective temperature of or near the surface of the photo conductor at the first and second locations, and corresponding image forming method

An image heating apparatus for allowing a surface of a heated toner image borne on a recording material to be glossed without generating a batter in the heated toner image is provided. In an image heating apparatus () including heating means (and) for heating an unfixed toner image (ta) borne on a recording material (P) and pressure means (and) for pressurizing an unfixed toner image (tb) heated by the heating means to gloss a surface of the unfixed toner image, the pressure means includes: pressure force changing means (L andR) for changing a pressure force when the pressure means pressurizes the unfixed toner image; temperature detecting means (and) for detecting a temperature of the pressure means; and pressurization control means (). The pressurization control means controls the pressure changing means according to temperature information of the temperature detecting means to change the pressure force of the pressure means before the pressure means pressurizes the unfixed toner image.

Image heating apparatus with temperature control in relation to glass transition of toner

An optical filter which can remove dust stuck to the incidence surface of incidence of light and reduce the mounting space. A filter body is adapted to have predetermined transmittivity as well as a piezoelectric characteristic. At least two electrodes are formed on the filter body. A drive voltage is applied between the at least two electrodes to vibrate the filter body.

Image-pickup apparatus for dust prevention

An image forming apparatus is provided in which on-surface potential unevenness of an image carrier can be suppressed, and with which an output image having excellent on-surface uniformity of color or the like can be obtained. The image forming apparatus includes: a photoconductive image carrier; charger which charges the image carrier; image exposing unit which exposes an image on a surface of the image carrier after the charging to form a latent electrostatic image; developing unit which develops the latent electrostatic image by adhering toner to the latent electrostatic image to form a toner image; and transfer charger which transfers the obtained toner image to a final supporting member such as plain paper.

Image forming apparatus which corrects charge potential on an image carrier

The present invention further improves gradation characteristics from a highlight region to a high-density region. First, the correction processing receives image data, and an image attribute discrimination discriminates whether the data are related to a character/thin line or others on the basis of attribute information on a pixel of interest. If it is discriminated that the data are related to a character/thin line, a pattern matching to data stored in a line buffer is performed to obtain a pixel distance, and in accordance with the pixel distance, a correction amount is determined on the basis of an LUT set in a correction amount determination. Subsequently, on the basis of the determined correction amount, corrected image data are generated and output to the following step.

Semiconductor laser drive control device

An image forming apparatus includes an electrophotographic photoconductive body for forming an electrostatic latent image thereon; an exposure device for exposing the electrophotographic photoconductive body to form an electrostatic latent image; a storage device for storing information related to potential characteristics at a plurality of areas divided on a surface of the electrophotographic photoconductive body in advance; an information obtaining device for obtaining the information related to potential characteristics, wherein light quantities exposed by the exposure device are determined according to the information related to potential characteristics stored by the storage device and the information related to potential characteristics obtained by the information obtaining device.

Image forming apparatus and method featuring correction for compensating differences in surface potential characteristics of an image supporting body

The image forming apparatus has an image forming portion capable of forming an image on a transferring medium by the use of a hypochromatic toner and a hyperchromatic toner of substantially the same color. The image forming portion is provided with a developing device for developing with the hypochromatic toner and the hyperchromatic toner, wherein, in an image area in which the hyperchromatic toner and the hypochromatic toner are mixedly present, the recording rate of the hyperchromatic toner is 1/16, the minimum size Wmini of a toner image of the hyperchromatic toner is 50 &#x3bc;m or less on the transferring medium. Thereby, it is achieved to reduce graininess.

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Mishima, Japan

Isami Itoh