Canon Kabushiki Kaisha

Kazuhiko Hirooka

Kimiyoshi Hayashi

Yoshiyuki Suzuki

Tetsuya Nozaki

Hiroyuki Ichikawa

Masahito Yamamoto

Hideki Adachi

Yoshihiro Funamizu

Masanori Sakai

Yasushi Murayama

Tatsuhito Kataoka

Hajime Kaji

Akio Ohno

Mitsuo Nimura

Masao Watanabe

Katsumi Takahashi

Hitoshi Arai

Kenichi Suda

Tadashi Suzuki

Kenichi Takeda

Mitsuhiko Sato

Toshio Honma

Yoshihiko Suzuki

Shokyo Koh

Yoshihito Osari

Keiju Kuboki

Kunio Yoshihara

Yoshio Mizuno

Isamu Sato

Masatoshi Tanabe

Masashi Oyumi

Akihiko Satoh

Ritsushi Tanabe

Michiharu Masuda

The color determination circuit detects hue of the color image information, and the controller decides a color component to be separated (separation color) in accordance with the detected hue. Output color by the printer is set in correspondence with the separation color. The two-color-separating circuit separates the color image information into image information on at least two color components in accordance with the decided separation colors. The separated image information on the each color is transmitted to the printer via printer density correction circuits and , and a buffer . Thereby it is possible to provide an image processing apparatus capable of setting and changing the separation color and the output color by automatic operation or by simple manual operation, thus the expression of the image forming can be improved.

Image processing system which forms two-color images

An image forming apparatus is provided with a sheet support on which sheets are supported thereon, a sheet feeding unit for feeding the sheets from the sheet support, a first conveying unit for conveying the sheets fed by the sheet feeding unit to the vicinity of an image forming device for forming images on the sheets, a second conveying unit for feeding the sheets conveyed by the first conveying unit to the image forming device so as to be cable of forming images thereon, and a control for controlling the sheet conveying speed of the sheet feeding unit, the first conveying unit and the second conveying unit, and the control controls so that the sheet conveying speed may become higher in the order of the sheet feeding unit, the second conveying unit and the first conveying unit.

Image forming apparatus with control of conveying speeds

There is provided a sheet detecting apparatus which detects the position of a sheet as it is conveyed through a conveying path and has reached a predetermined position. The surface condition and thickness of the sheet are also detected and a correction system is provided for correcting the position detecting result in accordance with the detected thickness and surface condition. Also provided is a conveying apparatus in which the conveyance of the sheet is controlled on the basis of the corrected sheet position detection.

Sheet detecting apparatus with correction means for sheet surface condition and sheet thickness

A sheet conveying apparatus is provided with a sheet feeding device for feeding sheets from a sheet supporting device on which the sheets are supported, a first sheet conveying device, a second sheet conveying device and a third sheet conveying device successively disposed downstream of the sheet supporting device with respect to the feeding direction of the sheets for conveying the sheets, a sheet interval judging device for detecting the passage of the sheets between the second sheet conveying device and the third sheet conveying device, and judging whether the interval between the sheets is a predetermined interval, and control device for controlling the sheet feeding device, the first sheet conveying device and the second sheet conveying device so that the sheets can be conveyed at the predetermined interval on the basis of the judgement of the sheet interval judging device.

Sheet conveying apparatus and image forming apparatus provided with the same

An image forming apparatus discriminates a color of an inputted color image for each pixel and generates a first color component and a second color component. The apparatus compares values of the first and the second color components, and selects and outputs the color component having a larger value. Meanwhile a color component which is not selected is diffused to neighboring pixels. When pixels neighboring a pixel of interest in a predetermined area are filled with one color component, the other color component is selected and outputted regardless of the values of the first and second color components.

Image forming apparatus which outputs a color image by separating color

There is disclosed an image forming apparatus, such as a copying machine, capable of various image forming modes. The image forming mode can be selected by feeding a mode registration format sheet into the apparatus. The format sheet can be a marking sheet, on which the operator can designate the desired image forming mode, and can be printed by the image forming apparatus itself in response to an instruction by the operator, so that the format sheet need not be prepared elsewhere in advance. Also the content of the format sheet, printed by the image forming apparatus, is varied according to the available copying modes, depending on the connection status of external processing units such as document feeder and sorter to the image forming apparatus.

Image forming apparatus

When an original image of a full color is reconstructed by two colors, it is intended to prevent that a part of the original image is not reconstructed. An image of a full color original is read by a CCD, thereby forming signals of R, G and B. In an image processing unit, the R, G, and B signals are converted into red and black signals. The red and black signals are sent to a printer unit and an image is formed in red and black.

Image processing apparatus for receiving multicolor image information

An image forming apparatus having a timer function includes a main switch for manually switching between supply and interruption of electric power to the apparatus, a detector for detecting whether the main switch is in a power-interruption state or in a power-supply state, a memory for storing a state indicating that the main switch is in a power-interruption state when it has been detected that the main switch is in a power-interruption state, a controller for placing the apparatus in a standby state in which an image can be formed or in a shutdown state in which an image cannot be formed during a preset time period, and a power supply for supplying power to the controller, wherein the apparatus is placed in a standby state even by a set shutdown time period in the case a power-interruption state is stored and wherein the apparatus is placed in a shutdown state during the set shutdown time period in the case the power-interruption state is not stored.

Image forming apparatus having a function of turning on a power supply

An image forming apparatus arranged to synthesize a plurality of images having different numbers of steps of tone representation, and thereafter form an image at different degrees of resolution corresponding to the respective numbers of steps of tone representation. According to one representative embodiment, an image forming apparatus inputs first and second image information to be synthesized with each other, the number of tone-levels of the second image information being less than the number of such levels of the first information. An image synthesizer, which is capable of changing an image forming resolution, forms a synthesized image from the first and second image information, and a controller controls the image forming resolution of the image synthesizer such that the first image information is formed at a first resolution and the second information is formed at a second resolution higher than the first resolution.

Image forming apparatus with selectively controlled resolution

An image processing apparatus connected with an image forming apparatus which forms an image at different degrees of resolution inputs image data from an external source and generates a control signal to control the degree of resolution at which the image forming apparatus forms the image from the image data. The control signal is a signal to control a driving power of the image forming apparatus. The image data input by the input means is output to the image forming apparatus, along with the control signal.

Method and apparatus for forming images at different degrees of

An apparatus for forming an image onto a transfer sheet a plurality of times includes an image forming unit for forming an image onto a sheet which is conveyed; first and second conveying units for conveying the sheet from the image forming unit to the image forming unit, wherein the second conveying unit stops the first sheet conveyed by the first conveying unit at a predetermined position and, after the second sheet which is conveyed subsequently to the first sheet conveyed by the first conveying unit was conveyed to a predetermined position on the first sheet, the second conveying unit conveys the first and second sheets in a partially overlapped state and separates the first sheet and supplies the separated first sheet to the image forming unit; and a sheet detecting sensor for detecting the front edge of the sheet which is conveyed by the first conveying unit. After the first sheet was conveyed by the first conveying unit by a first predetermined amount after the front edge of the first sheet had been detected by the sensor, the second conveying unit conveys the first sheet conveyed by the first conveying unit and stops the first sheet at the predetermined position, and after the second sheet was conveyed by the first conveying unit by a second predetermined amount different from the first predetermined amount after the front edge of the second sheet had been detected by the sensor, the second conveying unit conveys the first and second sheets.

Image forming apparatus to form images onto a sheet a plurality of times

An image forming apparatus responsive to environmental conditions has an image forming device for forming a dot image on a recording member. The image forming device includes exposure apparatus for exposing the recording member. A detector detects a humidity condition of the apparatus, and control circuitry regulates the amount of light of the exposure apparatus in accordance with an output of the detector. The control circuitry is adapted, when the humidity detected by the detector is lower than a predetermined value, to select an amount of light of the exposure apparatus larger than that in the case where the humidity is higher than the predetermined value.

Image forming apparatus having a converter for image data characteristics

An image processing apparatus includes an input unit for inputting images, and storage units for storing the images input from the input unit. The storage units store a plurality of images having common partial images. The apparatus further includes a determination unit for determining positions of the respective overlapped common partial images of the plurality of images stored in the storage units, a synthesis unit for forming an image by synthesizing the plurality of images according to a result of the determination by the determination unit, and an output unit for outputting the image synthesized by the synthesis unit.

Image processing method and apparatus for processing oversized original

An image processing apparatus having: an unit for receiving a digital multi-value pixel data; a D/A converter for converting the inputted multi-value pixel data into an analog signal; a generator for generating an analog pattern signal synchronously with an input of the digital multi-value pixel data; a sample/hold circuit for sampling and holding the analog signal converted by the D/A converter, synchronously with an input of the digital multi-value pixel data; and a binarizing circuit for generating a binarized pulse signal having a width corresponding to the value of the digital multi-value pixel data by comparing the analog signal held the said sample/hold circuit with the pattern signal generated by the pattern signal generator. A D/A converter having: a digital/analog conversion unit for converting a digital signal into an analog signal at the same speed as the period of generating the digital signal; and a sample/hold circuit for holding and outputting the analog signal converted by the digital/analog conversion unit, synchronously with the period of generating the digital signal.

Growing community of inventors

Tokyo, Japan

Kazuhiko Hirooka