Patents by Inventor Teruaki Mitsuya

Teruaki Mitsuya 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: 8045871
    Abstract: An image forming apparatus for performing an image forming operation is disclosed that includes an image carrier on which a toner image is formed, an intermediate transfer member configured to transfer the toner image to a recording medium, the intermediate transfer member having a toner image forming area including an output image forming area and a non-output image forming area located outside of the output image forming area, the toner image forming area being wider than the output image forming area, and a detecting part configured to measure a physical quantity regarding an image quality of a first reference image formed in the output image forming area and a second reference image formed in the non-output image forming area.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: October 25, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Susumu Monma, Shinya Kobayashi, Shinichi Akatsu, Teruaki Mitsuya, Makoto Yagawara, Hideharu Miki, Isao Nakajima
  • Patent number: 7945198
    Abstract: In a fixing device in which fixing defects can be suppressed and which can be reduced in size, and an image forming apparatus comprising the fixing device, setting is performed such that the surface temperature of an outer peripheral belt surface serving as a non-heated belt surface of a fixing belt is substantially equal at a heating region inlet at the upstream end of a heating region and a heating region outlet at the downstream end of the heating region such that the temperature difference between the surface temperature of the outer peripheral belt surface at the heating region inlet and the surface temperature of the outer peripheral belt surface at the heating region outlet is no more than 5 [° C.].
    Type: Grant
    Filed: April 6, 2007
    Date of Patent: May 17, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Teruaki Mitsuya, Takashi Suzuki, Keisuke Kubota, Yoshihiro Sonohara, Daisuke Hara
  • Patent number: 7574164
    Abstract: An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 ?m and a volume resistivity not lower than 106 ?·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: August 11, 2009
    Assignee: Ricoh Company Ltd.
    Inventors: Hisao Okada, Hiroyuki Mabuchi, Teruaki Mitsuya, Tsuneaki Kawanishi, Akio Tsujita
  • Patent number: 7548718
    Abstract: A fixing device, which fixes an unfixed toner image on a recording medium, includes a heating roller, a fixing roller, a pressurizing roller, and an endless belt that stretches over the heating roller and the fixing roller. A heat source and a heat pipe are arranged in a heating roller. The heat pipe substantially uniformly heats the surface of the heating roller.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: June 16, 2009
    Assignee: Ricoh Company, Limited
    Inventors: Keisuke Kubota, Teruaki Mitsuya, Takashi Suzuki, Yoshihiro Sonohara
  • Patent number: 7496307
    Abstract: An axis-to-axis distance between a heating roller and a back-up roller is expanded beforehand in inserting a thick paper to prevent a rush/exhaust impact when fixing the thick paper without changing a condition of pressing mechanism.
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: February 24, 2009
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Teruaki Mitsuya, Takashi Suzuki
  • Publication number: 20080317486
    Abstract: An image forming apparatus for performing an image forming operation is disclosed that includes an image carrier on which a toner image is formed, an intermediate transfer member configured to transfer the toner image to a recording medium, the intermediate transfer member having a toner image forming area including an output image forming area and a non-output image forming area located outside of the output image forming area, the toner image forming area being wider than the output image forming area, and a detecting part configured to measure a physical quantity regarding an image quality of a first reference image formed in the output image forming area and a second reference image formed in the non-output image forming area.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 25, 2008
    Inventors: Susumu MONMA, Shinya KOBAYASHI, Shinichi AKATSU, Teruaki MITSUYA, Makoto YAGAWARA, Hideharu MIKI, Isao NAKAJIMA
  • Publication number: 20080170896
    Abstract: A release-promoting agent is configured to be applied to a heating member in a fixing device that presses the heating member against a recording medium on which a toner image is formed and fixes the toner image to the recording medium, to promote release of the toner image from the heating member. The release-promoting agent is formed with a mixture of a dimethyl polysiloxane and an amino group-containing dimethyl polysiloxane represented by respectively, where b?0, and c>1000.
    Type: Application
    Filed: October 30, 2006
    Publication date: July 17, 2008
    Inventors: Keisuke Kubota, Teruaki Mitsuya, Takashi Suzuki, Yoshihiro Sonohara
  • Patent number: 7324778
    Abstract: A fixing device wherein supposing that the total load given to a heating roller and a pressure roller is W (kgf) and the area of the pressure contact portion of the heating roller with respect to the pressure roller (nip area) is S (cm2), the nip pressure (=W/S) is 2.7 kgf/cm2 or more and the length of the pressure contact portion in the direction parallel to the direction of conveyance of a recording material is defined to be 14 mm or more.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: January 29, 2008
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Takashi Suzuki, Teruaki Mitsuya, Keisuke Kubota, Masato Miwa, Yoshitaka Fujinuma, Tsutomu Nakagawa
  • Publication number: 20080013995
    Abstract: A fixing device, which fixes an unfixed toner image on a recording medium, includes a heating roller, a fixing roller, a pressurizing roller, and an endless belt that stretches over the heating roller and the fixing roller. A heat source and a heat pipe are arranged in a heating roller. The heat pipe substantially uniformly heats the surface of the heating roller.
    Type: Application
    Filed: July 11, 2007
    Publication date: January 17, 2008
    Inventors: Keisuke KUBOTA, Teruaki Mitsuya, Takashi Suzuki, Yoshihiro Sonohara
  • Publication number: 20070237554
    Abstract: In a fixing device in which fixing defects can be suppressed and which can be reduced in size, and an image forming apparatus comprising the fixing device, setting is performed such that the surface temperature of an outer peripheral belt surface serving as a non-heated belt surface of a fixing belt is substantially equal at a heating region inlet at the upstream end of a heating region and a heating region outlet at the downstream end of the heating region such that the temperature difference between the surface temperature of the outer peripheral belt surface at the heating region inlet and the surface temperature of the outer peripheral belt surface at the heating region outlet is no more than 5 [° C.].
    Type: Application
    Filed: April 6, 2007
    Publication date: October 11, 2007
    Inventors: Teruaki Mitsuya, Takashi Suzuki, Keisuke Kubota, Yoshihiro Sonohara, Daisuke Hara
  • Publication number: 20070212085
    Abstract: An axis-to-axis distance between a heating roller and a back-up roller is expanded beforehand in inserting a thick paper to prevent a rush/exhaust impact when fixing the thick paper without changing a condition of pressing mechanism.
    Type: Application
    Filed: February 8, 2007
    Publication date: September 13, 2007
    Applicant: RICOH PRINTING SYSTEMS, LTD.
    Inventors: Teruaki Mitsuya, Takashi Suzuki
  • Publication number: 20070172262
    Abstract: An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 ?m and a volume resistivity not lower than 106 ?·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
    Type: Application
    Filed: September 23, 2005
    Publication date: July 26, 2007
    Applicant: Ricoh Printing Systems, Ltd.
    Inventors: Hisao Okada, Hiroyuki Mabuchi, Teruaki Mitsuya, Tsuneaki Kawanishi, Akio Tsujita
  • Publication number: 20070071467
    Abstract: An image formation apparatus is disclosed. The image formation apparatus includes a fixing unit whose heater temperature is controlled to be in a non-offsetting range so that no offset is produced, the non-offsetting range being defined for each different paper thickness. Nip time remains constant even when the thickness of the paper to be printed on next is changed. Printing is suspended until the heater temperature, approaching the non-offsetting range, reaches an inconspicuous offset range on either side of the non-offsetting range, inconspicuous offset being produced if printing is performed in the inconspicuous offset range.
    Type: Application
    Filed: June 28, 2006
    Publication date: March 29, 2007
    Inventors: Teruaki Mitsuya, Masahiro Yagi, Toshio Ogiso, Shunichi Oohara, Shigeru Obata, Toru Hanashima, Osamu Saito
  • Patent number: 7106983
    Abstract: A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: September 12, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Masayoshi Nakayama, Teruaki Mitsuya, Hisao Okada, Keisuke Kubota, Takashi Rokutanda
  • Patent number: 7090956
    Abstract: In an image forming method, when viewed from the moving direction of a photosensitive body 1, there is disposed, on the upstream side, a first developing roller 61 opposed to and adjacent to the photosensitive body 1 and rotatable in the opposite direction to the photosensitive body 1, while the peripheral speed ratio of the roller 61 to the photosensitive body 1 ranges from 0.8 to 2.0; on the downstream side of the roller 61, there is disposed a second developing roller 62 rotatable in the same direction to the photosensitive body 1, while the peripheral speed ratio of the roller 62 to the photosensitive body 1 ranges from 1.05 to 2.0; and the shape coefficient SF1 of the toners of two-component developing agent ranges from 120 to 170, while the shape coefficient SF2 ranges from 110 to 130.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: August 15, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Katsuhiko Suzuki, Masami Ishikawa, Tsuneaki Kawanishi, Teruaki Mitsuya, Hisao Okada, Masayoshi Ishii
  • Patent number: 6993275
    Abstract: In an electrophotographic recording device, a multicolor toner image is formed by images in each color superimposed on one another. In order to detect image misalignment, image-forming units form a color registration detection pattern, and sensors detect the pattern and output detection signals. A control unit detects the position of the patterns based on only portions of the detection signals corresponding to leading edges of the patterns.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: January 31, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Teruaki Mitsuya, Hiroyuki Mabuchi, Toru Miyasaka, Mieko Ishii
  • Publication number: 20060002749
    Abstract: A fixing device wherein supposing that the total load given to the heating roller and the pressure roller is W (kgf) and the area of the pressure contact portion of the heating roller with respect to the pressure roller (nip area) is S (cm2), the nip pressure (=W/S) is 2.7 kgf/cm2 or more and the length of the pressure contact portion in the direction parallel to the direction of conveyance of the recording material is defined to be 14 mm or more.
    Type: Application
    Filed: July 1, 2005
    Publication date: January 5, 2006
    Applicant: RICOH PRINTING SYSTEMS, LTD.
    Inventors: Takashi Suzuki, Teruaki Mitsuya, Keisuke Kubota, Masato Miwa, Yoshitaka Fujinuma, Tsutomu Nakagawa
  • Patent number: 6907220
    Abstract: A cooling device used in an electrophotographic image forming device includes a cooling roller, which is a heat roller, and a backup roller pressed against the cooling roller to form a nip portion therebetween. After being discharged from a fixing device that thermally fixes a toner image onto a recording sheet, the recording sheet passes through the nip portion, whereby the cooling roller cools the recording sheet. The cooling roller is maintained at 100° C. or higher.
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: June 14, 2005
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Teruaki Mitsuya, Takashi Suzuki, Heigo Ueki, Daisuke Hara
  • Publication number: 20050063721
    Abstract: A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.
    Type: Application
    Filed: August 12, 2004
    Publication date: March 24, 2005
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Masayoshi Nakayama, Teruaki Mitsuya, Hisao Okada, Keisuke Kubota, Takashi Rokutanda
  • Patent number: 6829449
    Abstract: A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: December 7, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Hiroyoshi Matsumoto, Teruaki Mitsuya, Tsuneaki Kawanishi, Hisao Okada, Natsuki Kuribayashi, Masayoshi Ishii, Keisuke Kubota