Patents by Inventor Hiroyuki Kiyoi

Hiroyuki Kiyoi 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).

  • Patent number: 7938527
    Abstract: To provide an ink jet recording method including: performing image recording on a recording medium to obtain an ink adhesion quantity of 15 g/m2 or less of an ink containing at least a colorant, the recording medium having at least one coating layer on at least one surface of a substrate including cellulose pulp; and dry-to-touch drying the recorded image and bringing a heat source into direct contact with the recording medium for image fixing, wherein the recording medium is formed such that a transfer quantity of pure water into the recording medium in a contact interval of 100 ms that is measured with a dynamic scanning liquid absorptometer is 1 mL/m2 or more to 30 mL/m2 or less and a transfer quantity of pure water into the recording medium in a contact interval of 400 ms is 2 mL/m2 or more to 35 mL/m2 or less.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: May 10, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Tohru Ohshima, Naoya Morohoshi, Kiyofumi Nagai, Hiroyuki Kiyoi, Masanori Hirano, Shigetaka Sakakibara
  • Publication number: 20100265292
    Abstract: To provide an ink jet recording method including: performing image recording on a recording medium to obtain an ink adhesion quantity of 15 g/m2 or less of an ink containing at least a colorant, the recording medium having at least one coating layer on at least one surface of a substrate including cellulose pulp; and dry-to-touch drying the recorded image and bringing a heat source into direct contact with the recording medium for image fixing, wherein the recording medium is formed such that a transfer quantity of pure water into the recording medium in a contact interval of 100 ms that is measured with a dynamic scanning liquid absorptometer is 1 mL/m2 or more to 30 mL/m2 or less and a transfer quantity of pure water into the recording medium in a contact interval of 400 ms is 2 mL/m2 or more to 35 mL/m2 or less.
    Type: Application
    Filed: September 18, 2007
    Publication date: October 21, 2010
    Inventors: Tohru Ohshima, Naoya Morohoshi, Kiyofumi Nagai, Hiroyuki Kiyoi, Masanori Hirano, Shigetaka Sakakibara
  • Patent number: 5832330
    Abstract: In a fixing system used to an electrophotographic recording apparatus, when a fixing roller is heated to a temperature above a preset fixing temperature by a heater and then a thermistor senses that the surface temperature of the fixing roller falls below the fixing temperature, a heater controller energizes the heater for a predetermined driving time and then deenergizes of the heater for a predetermined heater interrupting time to thereby control the surface temperature of the fixing roller. The heater driving time and the heater interrupting time may be stored in a memory region in accordance with respective sizes of recording papers. The duty ratio of the heater may be changed when a predetermined number of images have been recorded or when the fixing system is continuously operated for longer than a predetermined time.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: November 3, 1998
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroyuki Kiyoi
  • Patent number: 5682577
    Abstract: In a fixing system used to an electrophotographic recording apparatus, when a fixing roller is heated to a temperature above a preset fixing temperature by a heater and then a thermistor senses that the surface temperature of the fixing roller falls below the fixing temperature, a heater controller energizes the heater for a predetermined driving time and then deenergizes of the heater for a predetermined heater interrupting time to thereby control the surface temperature of the fixing roller. The heater driving time and the heater interrupting time may be stored in a memory region in accordance with respective sizes of recording papers. The duty ratio of the heater may be changed when a predetermined number of images have been recorded or when the fixing system is continuously operated for longer than a predetermined time.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: October 28, 1997
    Assignee: Richoh Company, Ltd.
    Inventor: Hiroyuki Kiyoi
  • Patent number: 5126799
    Abstract: A xerographic image recording apparatus includes a photosensitive body moved along a circuitous path, an electric discharging unit for eliminating electric charges from the photosensitive body, a precharging unit for charging the photosensitive body electrically, an image writing unit for writing an image on the photosensitive body, an image developing unit for coating the photosensitive body by the toner to form a toner image on the photosensitive body, a recording sheet feeding unit for feeding a recording sheet along a sheet path, an image transfer unit for transferring the toner image onto a recording sheet, a cleaning unit for removing the toner remaining on the photosensitive body after the transfer of image on the recording sheet is completed, a toner supply tank for supplying the toner to the image developing unit, and a toner recovery tank for collecting the toner removed by the cleaning unit from the photosensitive body, wherein the toner supply tank and the toner recovery tank are assembled into a
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: June 30, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Yozo Matsuura, Shiroh Kondoh, Kazuhiro Yuasa, Hiroshi Saitoh, Hiroyuki Kiyoi, Masanori Yoshimura, Masahiro Kawabe, Yoshiya Itoh
  • Patent number: RE35528
    Abstract: A xerographic image recording apparatus includes a photosensitive body moved along a circuitous path, an electric discharging unit for eliminating electric charges from the photosensitive body, a precharging unit for charging the photosensitive body electrically, an image writing unit for writing an image on the photosensitive body, an image developing unit for coating the photosensitive body by the toner to form a toner image on the photosensitive body; a recording sheet feeding unit for feeding a recording sheet along a sheet path, an image transfer unit for transferring the toner image onto a recording sheet, a cleaning unit for removing the toner remaining on the photosensitive body after the transfer of image on the recording sheet is completed, a toner supply tank for supplying the toner to the image developing unit, and a toner recovery tank for collecting the toner removed by the cleaning unit from the photosensitive body, wherein the toner supply tank and the toner recovery tank are assembled into a
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: June 10, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Yozo Matsuura, Shiroh Kondoh, Kazuhiro Yuasa, Hiroshi Saitoh, Hiroyuki Kiyoi, Masanori Yoshimura, Masahiro Kawabe, Yoshiya Itoh