Patents by Inventor Tatsuhito Kataoka
Tatsuhito Kataoka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7298502Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.Type: GrantFiled: June 9, 2005Date of Patent: November 20, 2007Assignee: Canon Kabushiki KaishaInventors: Tatsuhito Kataoka, Hirokazu Kodama
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Patent number: 7088937Abstract: An image fixing apparatus has a first rotatable member heated by a first heater and a first temperature detecting element for detecting its temperature; a first controller for controlling electric supply to the first heater to maintain a detected temperature of the first temperature detecting element at a first target temperature; a second rotatable member heated by a second heater and forming a fixing nip with the first rotatable member; a second temperature detecting element for detecting a temperature of the second rotatable member; a second controller for controlling electric supply to the second heater to maintain the detected temperature of the second temperature detecting element at a second target temperature; and a phase controller for controlling electric energy supply phase so as to avoid overlapping of a phase of an electric power supply to the first heater and a phase of an electric power supply to the second heater.Type: GrantFiled: May 4, 2005Date of Patent: August 8, 2006Assignee: Canon Kabushiki KaishaInventor: Tatsuhito Kataoka
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Patent number: 6990299Abstract: An image fixing apparatus has a first rotatable member heated by a first heater and a first temperature detecting element for detecting its temperature; a first controller for controlling electric supply to the first heater to maintain a detected temperature of the first temperature detecting element at a first target temperature; a second rotatable member heated by a second heater and forming a fixing nip with the first rotatable member; a second temperature detecting element for detecting a temperature of the second rotatable member, a second controller for controlling electric supply to the second heater to maintain the detected temperature of the second temperature detecting element at a second target temperature; and a phase controller for controlling electric energy supply phase so as to avoid overlapping of a phase of an electric power supply to the first heater and a phase of an electric power supply to the second heater.Type: GrantFiled: August 20, 2003Date of Patent: January 24, 2006Assignee: Canon Kabushiki KaishaInventor: Tatsuhito Kataoka
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Publication number: 20050237374Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.Type: ApplicationFiled: June 9, 2005Publication date: October 27, 2005Inventors: Tatsuhito Kataoka, Hirokazu Kodama
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Publication number: 20050201769Abstract: An image fixing apparatus has a first rotatable member heated by a first heater and a first temperature detecting element for detecting its temperature; a first controller for controlling electric supply to the first heater to maintain a detected temperature of the first temperature detecting element at a first target temperature; a second rotatable member heated by a second heater, and forming a fixing nip with the first rotatable member; a second temperature detecting element for detecting a temperature of the second rotatable member; a second controller for controlling electric supply to the second heater to maintain the detected temperature of the second temperature detecting element at a second target temperature; and a phase controller for controlling electric energy supply phase so as to avoid overlapping of a phase of an electric power supply to the first heater and a phase of an electric power supply to the second heater.Type: ApplicationFiled: May 4, 2005Publication date: September 15, 2005Applicant: CANON KABUSHIKI KAISHAInventor: Tatsuhito Kataoka
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Patent number: 6930786Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.Type: GrantFiled: November 29, 2000Date of Patent: August 16, 2005Assignee: Canon Kabushiki KaishaInventors: Tatsuhito Kataoka, Hirokazu Kodama
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Publication number: 20040258437Abstract: An image information detection sensor includes a light-emitting element, a light-emitting pinhole which focuses light from the light-emitting element as detection light into a toner image detection region without using any lens, a light-receiving pinhole which transmits detection light reflected in the toner image detection region, and a light-receiving element which receives detection light having passed through the light-receiving pinhole. The spot diameter of an LED is reduced by minimizing the hole diameter of the light-emitting pinhole as far as a sufficient detection level can be obtained. The hole diameter of the light-receiving pinhole is set larger than that on the light-emitting side so as to receive a larger quantity of regularly reflected light, and if possible, all light.Type: ApplicationFiled: April 8, 2004Publication date: December 23, 2004Applicant: Canon Kabushiki KaishaInventors: Toshihumi Kakutani, Hajime Kaji, Tatsuhito Kataoka
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Patent number: 6654572Abstract: An image fixing apparatus includes a first rotatable member for being heated by a first heater; a first temperature detecting element for detecting a temperature of the first rotatable member; first control for controlling electric energy supply through the first heater so as to maintain a detected temperature of the first temperature detecting element at a first target temperature; a second rotatable member for being heated by the second heater, the second rotatable member constituting a fixing nip with the first rotatable member; a second temperature detecting element for detecting a temperature of the second rotatable member; a second control for controlling electric energy supply to the second heater so as to maintain the detected temperature of the second temperature detecting element at a second target temperature; and phase control for controlling electric energy supply phase so as to avoid overlapping of a phase of an electric power supply to the first heater and a phase of an electric power supply toType: GrantFiled: December 13, 2001Date of Patent: November 25, 2003Assignee: Canon Kabushiki KaishaInventor: Tatsuhito Kataoka
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Patent number: 6614506Abstract: An image forming apparatus for sequentially superimposes images formed by a plurality of image forming stations for forming images of different colors, respectively, on a transferring material born and transported by a transferring material transporting member, which forms a misregister detection mark on the transferring material transporting member, illuminates to read the mark, calculates a misregister amount of the read misregister detection mark, and corrects the misregister of an image based on calculated results, wherein the apparatus adjusts an illuminating light amount according to a color of a misregister detection mark.Type: GrantFiled: May 30, 2001Date of Patent: September 2, 2003Assignee: Canon Kabushiki KaishaInventors: Hirokazu Kodama, Tatsuhito Kataoka
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Patent number: 6519427Abstract: An object of the present invention is to provide a heating apparatus that has a heat generating member a heating member heated by the heat generating member a temperature detecting member for detecting a temperature of the heating member and power supply control device for controlling power supply to the heat generating member on the basis of a detection output of the temperature detecting member, the power supply control device including a first power supply control for applying an AC voltage of a limited phase to the heat generating member and a second power supply control for applying an AC voltage of an unlimited phase to the heat generating member, wherein turning ON/OFF of power supply to the heat generating member on the basis of the detection output of the temperature detecting member is not effected during the first power supply control.Type: GrantFiled: November 20, 2001Date of Patent: February 11, 2003Assignee: Canon Kabushiki KaishaInventor: Tatsuhito Kataoka
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Publication number: 20020085852Abstract: An image fixing apparatus includes a first rotatable member for being heated by a first heater; a first temperature detecting element for detecting a temperature of the first rotatable member; first control means for controlling electric energy supply through the first heater so as to maintain a detected temperature of the first temperature detecting element at a first target temperature; a second rotatable member for being heated by the second heater, the second rotatable member constituting a fixing nip with the first rotatable member; a second temperature detecting element for detecting a temperature of the second rotatable member; a second control means for controlling electric energy supply to the second heater so as to maintain the detected temperature of the second temperature detecting element at a second target temperature; and phase control means for controlling electric energy supply phase so as to avoid overlapping of a phase of an electric power supply to the first heater and a phase of an electrType: ApplicationFiled: December 13, 2001Publication date: July 4, 2002Inventor: Tatsuhito Kataoka
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Patent number: 6397035Abstract: 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.Type: GrantFiled: October 13, 1999Date of Patent: May 28, 2002Assignee: Canon Kabushiki KaishaInventors: Tatsuhito Kataoka, Kazuhiko Hirooka, Yoshihiro Funamizu, Katsumi Takahashi
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Patent number: 6396858Abstract: A laser driving method is adapted for driving a plurality of laser emitting devices. A first current to be supplied to each of the plurality of laser emitting devices is always generated. A plurality of second currents controlled according to a control signal supplied from the outside are generated when necessary. The plurality of second currents are supplied to the respective laser emitting devices under supply of the respective first currents, thereby making the laser emitting devices emit respective laser beams. The plurality of laser emitting devices are caused to emit the laser beams in time division at predetermined timing to detect each of emitted light amounts by one laser monitor. Adjustment is made to at least one of the first current and the second current supplied to each of the laser emitting devices according to a plurality of detected light amounts detected.Type: GrantFiled: February 26, 1999Date of Patent: May 28, 2002Assignee: Canon Kabushiki KaishaInventors: Takayuki Kawakami, Tomobumi Nakayama, Isamu Sato, Tatsuhito Kataoka, Katsuhide Koga, Yukio Yokoyama
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Publication number: 20020061202Abstract: An object of the present invention is to provide a heating apparatus that has a heat generating member a heating member heated by the heat generating member a temperature detecting member for detecting a temperature of the heating member and power supply control device for controlling power supply to the heat generating member on the basis of a detection output of the temperature detecting member, the power supply control means including a first power supply control for applying an AC voltage of a limited phase to the heat generating member and a second power supply control for applying an AC voltage of an unlimited phase to the heat generating member, wherein turning ON/OFF of power supply to the heat generating member on the basis of the detection output of the temperature detecting member is not effected during the first power supply control.Type: ApplicationFiled: November 20, 2001Publication date: May 23, 2002Inventor: Tatsuhito Kataoka
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Publication number: 20020018678Abstract: An image forming apparatus is provided with sheet supporting means on which sheets are supported thereon, sheet feeding means for feeding the sheets from the sheet supporting means, sheet conveying means for conveying the sheets fed by the sheet feeding means to the vicinity of image forming means for forming images on the sheets, image forming and conveying means for feeding the sheets conveyed by the sheet conveying means to the image forming means so as to be capable of forming images thereon, and control means for controlling the sheet conveying speed of the sheet feeding means, the sheet conveying means and the image forming and conveying means, and the control means controls so that the sheet conveying speed may become higher in the order of the sheet feeding means, the image forming and conveying means and the sheet conveying means.Type: ApplicationFiled: October 13, 1999Publication date: February 14, 2002Inventors: TATSUHITO KATAOKA, KAZUHIKO HIROOKA, YOSHIHIRO FUNAMIZU, KATSUMI TAKAHASHI
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Publication number: 20020008859Abstract: An image forming apparatus for sequentially superimposes images formed by a plurality of image forming stations for forming images of different colors, respectively, on a transferring material born and transported by a transferring material transporting member, which forms a misregister detection mark on the transferring material transporting member, illuminates to read the mark, calculates a misregister amount of the read misregister detection mark, and corrects the misregister of an image based on calculated results, wherein the apparatus adjusts an illuminating light amount according to a color of a misregister detection mark.Type: ApplicationFiled: May 30, 2001Publication date: January 24, 2002Inventors: Hirokazu Kodama, Tatsuhito Kataoka
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Publication number: 20010046242Abstract: A laser driving method is adapted for driving a plurality of laser emitting devices. A first current to be supplied to each of the plurality of laser emitting devices is always generated. A plurality of second currents controlled according to a control signal supplied from the outside are generated when necessary. The plurality of second currents are supplied to the respective laser emitting devices under supply of the respective first currents, thereby making the laser emitting devices emit respective laser beams. The plurality of laser emitting devices are caused to emit the laser beams in time division at predetermined timing to detect each of emitted light amounts by one laser monitor. Adjustment is made to at least one of the first current and the second current supplied to each of the laser emitting devices according to a plurality of detected light amounts detected.Type: ApplicationFiled: February 26, 1999Publication date: November 29, 2001Inventors: TAKAYUKI KAWAKAMI, TOMOBUMI NAKAYAMA, KAZUMI NAKAYAMA, ISAMU SATO, TATSUHITO KATAOKA, KATSUHIDE KOGA, YUKIO YOKOYAMA
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Patent number: 6311039Abstract: 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.Type: GrantFiled: October 22, 1999Date of Patent: October 30, 2001Assignee: Canon Kabushiki KaishaInventors: Yoshihiro Funamizu, Kazuhiko Hirooka, Tatsuhito Kataoka, Katsumi Takahashi
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Patent number: 6266078Abstract: An image forming apparatus, including a driving circuit for a multichip laser chip, which can limit or interrupt emission of laser light sources in accordance with a result of comparison of an optical output of each laser light source with a limiting value during time-division control is provided. The apparatus includes a plurality of laser light source, a light-amount control device for controlling an optical output of a laser beam from each of the plurality of laser light sources to a constant amount of light by performing time division processing, and a light detection device for detecting optical outputs of the plurality of laser light sources. The light detection device includes sensor units whose number is smaller than the number of the plurality of laser light sources.Type: GrantFiled: December 23, 1998Date of Patent: July 24, 2001Assignee: Canon Kabushiki KaishaInventors: Katsuhide Koga, Tomobumi Nakayama, Isamu Sato, Tatsuhito Kataoka, Yukio Yokoyama, Takayuki Kawakami
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Publication number: 20010005266Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.Type: ApplicationFiled: November 29, 2000Publication date: June 28, 2001Inventors: Tatsuhito Kataoka, Hirokazu Kodama