Patents by Inventor Takaya Muraishi

Takaya Muraishi 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: 11647170
    Abstract: An image projection device includes a projector configured to project an image; and an operation unit configured to receive an operation performed by an operator. The projector is in a projecting state while the operation unit is receiving a pressing operation performed by the operator, and the projector is in a non-projecting state while the operation unit is not receiving a pressing operation performed by the operator.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: May 9, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoko Takahashi, Yuuji Wada, Yu Yoneda, Daisuke Tomita, Kunihiko Nishioka, Hideki Kosugi, Yasukazu Kitamura, Toshihiro Hamamura, Takaya Muraishi, Naomi Sugimoto, Yasunari Harada
  • Publication number: 20210127097
    Abstract: An image projection device includes a projector configured to project an image; and an operation unit configured to receive an operation performed by an operator. The projector is in a projecting state while the operation unit is receiving a pressing operation performed by the operator, and the projector is in a non-projecting state while the operation unit is not receiving a pressing operation performed by the operator.
    Type: Application
    Filed: October 21, 2020
    Publication date: April 29, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomoko TAKAHASHI, Yuuji WADA, Yu YONEDA, Daisuke TOMITA, Kunihiko NISHIOKA, Hideki KOSUGI, Yasukazu KITAMURA, Toshihiro HAMAMURA, Takaya MURAISHI, Naomi SUGIMOTO, Yasunari HARADA
  • Patent number: 8999501
    Abstract: A urethane foam member that after cutting into the desired shape from sheet urethane foam is applied with adhesive on one face of the urethane foam, an edge portion of the non-adhesive applied face at least at one side of the urethane foam member being of a low edge profile, to which permanent thermal distortion has been induced such that the thickness of the edge portion of the side is thinnest at the end portion thereof and the thickness gradually increases with distance from the end portion.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: April 7, 2015
    Assignees: Ricoh Company, Ltd, Bridgestone Corporation
    Inventors: Takaya Muraishi, Satoshi Hatori, Kaoru Yoshino, Norio Yamagami, Etsuo Kakizaki
  • Patent number: 8699898
    Abstract: An image forming apparatus including a setting memory storing multiple voltage settings; two or more voltage applying members each contacting a voltage applied member at respective contact positions close to each other, which are simultaneously being applied with respective voltages selected from the voltage settings; two or more current detectors each detecting a current flowing in the respective contact positions; and a setting changer performing a setting changing processing in which the voltage applied to one of the voltage applying members is changed based on the current detected by the corresponding current detector while a predetermined voltage is applied to the other voltage applying members, so that an optimum current flows in the corresponding contact position.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: April 15, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hisashi Kikuchi, Takaya Muraishi, Kenji Sugiura, Akira Asaoka, Yoshiki Hozumi, Yuu Sakakibara
  • Patent number: 8699908
    Abstract: A cleaning device including a rotatable cleaning member contacting a rotatable image carrier bearing a toner image to electrostatically remove toner from the image carrier while rotating, and a control unit to control rotation of the cleaning member to satisfy a relation of (60/R)>(L/V) during removal of a toner pattern formed on the image carrier at a predetermined timing and remaining attached to the image carrier without being transferred from the image carrier onto a transfer member using the cleaning member, where R (rpm) is a number of rotations of the cleaning member, L (mm) is a length of the toner pattern in a direction of rotation of the image carrier, and V (mm/s) is a speed of the image carrier.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: April 15, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hisashi Kikuchi, Takaya Muraishi, Kenji Sugiura, Akira Asaoka, Yoshiki Hozumi, Yuu Sakakibara
  • Patent number: 8682208
    Abstract: A cleaning device including: multiple cleaning members arranged consecutively in a direction of movement of a cleaning target to remove adhered substances from the cleaning target; multiple casings to individually hold and at least partially enclose the multiple cleaning members, respectively, the casings and the cleaning members together constituting multiple sub-units; and a sub-unit holder to hold the multiple sub-units, from which the sub-units are individually removable.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: March 25, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Akira Asaoka, Takaya Muraishi, Kenji Sugiura, Hisashi Kikuchi, Yoshiki Hozumi, Yuu Sakakibara
  • Publication number: 20130315617
    Abstract: An image forming apparatus including a belt cleaning device is provided. The belt cleaning device includes an image bearing belt having an elastic layer, a cleaning member, a cleaning facing member, and a side seal. A surface of the image bearing belt is movable. The cleaning member is in contact with the surface of the image bearing belt to remove a substance adhered thereto. The cleaning facing member is disposed on a back-surface side of the image bearing belt while facing the cleaning member with the image bearing belt therebetween. The side seal is disposed to an axial end part of the cleaning member and pressed against the surface of the image bearing belt. The cleaning facing member is out of contact with the back side of the image bearing belt within an area where the cleaning facing member faces the side seal with respect to an axial direction.
    Type: Application
    Filed: May 21, 2013
    Publication date: November 28, 2013
    Inventors: Kenji Sugiura, Takaya Muraishi, Hisashi Kikuchi, Akira Asaoka, Yoshiki Hozumi, Yuu Sakakibara
  • Patent number: 8483605
    Abstract: A cleaning device including a normally charged toner cleaning member provided in contact with a cleaning target at a contact position to remove normally charged toner from the cleaning target, a reversely charged toner cleaning member provided in contact with the cleaning target at a contact position upstream from the normally charged toner cleaning member to remove reversely charged toner from the cleaning target, and a pre-cleaning member provided in contact with the cleaning target at a contact position upstream from both the normally and reversely charged toner cleaning members to remove normally charged toner from the cleaning target. The contact position between the pre-cleaning member and the cleaning target has a width wider than a width of the contact position between the normally charged toner cleaning member and the cleaning target and a width of the contact position between the reversely charged toner cleaning member and the cleaning target.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: July 9, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Akira Asaoka, Takaya Muraishi, Kenji Sugiura, Hisashi Kikuchi, Yoshiki Hozumi, Yuu Sakakibara
  • Patent number: 8428488
    Abstract: A cleaning roller cleaning a surface of a cleaning component, wherein the cleaning roller is provided in a roller configuration having a cylindrical shape and has a portion in contact with the cleaning component, the portion being made of a melamine resin foam having a continuous foam structure, the melamine resin foam being provided by heating compression from an original configuration in a radial direction, and wherein the portion in contact with the cleaning component has a continuous foam structure and a tensile strength in a range of 1.7±0.5 kg/cm2, and an image forming apparatus incorporating the same.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: April 23, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruji Mizuishi, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya
  • Patent number: 8315535
    Abstract: A cleaning unit, which can be incorporated in a process cartridge removably installable in an image forming apparatus, includes a lubricant applicator to apply lubricant to an image carrier, a first blade disposed upstream from the lubricant applicator in a direction of rotation of the image carrier with its distal end held in contact with the image carrier to remove residual toner remaining on the image carrier, a second blade disposed downstream from the lubricant applicator in the direction of rotation of the image carrier with its distal end held in contact with the image carrier to regulate the amount of lubricant applied to the image carrier, a temperature measuring member to measure a temperature of or near the second blade, a heater, and a temperature controller to control the heater to heat the second blade so that the measured temperature falls within a given set temperature range.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: November 20, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Shintani, Nobuo Kuwabara, Satoshi Hatori, Daisuke Tomita, Akio Kosuge, Yoshinori Ozawa, Shinichi Kawahara, Takaya Muraishi, Yasushi Akiba
  • Patent number: 8280293
    Abstract: In an image forming apparatus including a plurality of image forming devices, a first image forming device in which a leveling blade that functions as a lubricant leveling blade is easily worn away over time uses an obtuse-angle blade as a first leveling blade, and a second image forming device being other image forming device among the plurality of image forming devices uses a right-angle blade as a second leveling blade.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: October 2, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Takeshi Shintani, Nobuo Kuwabara, Satoshi Hatori, Daisuke Tomita, Akio Kosuge, Shinichi Kawahara, Shinya Karasawa, Takaya Muraishi, Yasushi Akiba
  • Publication number: 20120224870
    Abstract: A novel image forming apparatus including a setting memory storing multiple voltage settings; two or more voltage applying members each contacting a voltage applied member at respective contact positions close to each other, which are simultaneously being applied with respective voltages selected from the voltage settings; two or more current detectors each detecting a current flowing in the respective contact positions; and a setting changer performing a setting changing processing in which the voltage applied to one of the voltage applying members is changed based on the current detected by the corresponding current detector while a predetermined voltage is applied to the other voltage applying members, so that an optimum current flows in the corresponding contact position.
    Type: Application
    Filed: December 7, 2011
    Publication date: September 6, 2012
    Inventors: Hisashi Kikuchi, Takaya Muraishi, Kenji Sugiura, Akira Asaoka, Yoshiki Hozumi, Yuu Sakakibara
  • Patent number: 8204422
    Abstract: An image forming apparatus includes a plurality of process cartridges provided for black and for another color. The process cartridges each including a set of a latent image carrier, a charging unit that charges a surface of the latent image carrier, and a lubricant applying unit that applies lubricant to the surface of the latent image carrier. The process cartridges for black and for the another color each has a cartridge frame with which the process cartridge is attachable to and removable from an apparatus body. The cartridge frames of the process cartridges for black and for the another color being of the same type. The process cartridge for black differs from the process cartridge for the another color in the configuration of the charging unit. The amounts of lubricant applied by the lubricant applying units to the respective latent image carriers differ with respect to the configuration of the charging unit.
    Type: Grant
    Filed: July 3, 2008
    Date of Patent: June 19, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Satoshi Hatori, Yasushi Akiba, Kaoru Yoshino, Takaya Muraishi, Akio Kosuge, Takeshi Shintani
  • Patent number: 8204423
    Abstract: Described embodiments include apparatuses and processes for cleaning a surface of a rotatable image carrier including a cleaning unit configured to prevent material from accumulating on a cleaning blade.
    Type: Grant
    Filed: January 8, 2009
    Date of Patent: June 19, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Hatori, Takaya Muraishi, Takeshi Shintani, Yasushi Akiba, Akio Kosuge, Kaoru Yoshino, Hiroyuki Nagashima, Fumihito Itoh, Hiroshi Ono, Nobuo Kuwabara
  • Publication number: 20120099883
    Abstract: A cleaning device including a rotatable cleaning member contacting a rotatable image carrier bearing a toner image to electrostatically remove toner from the image carrier while rotating, and a control unit to control rotation of the cleaning member to satisfy a relation of (60/R)>(L/V) during removal of a toner pattern formed on the image carrier at a predetermined timing and remaining attached to the image carrier without being transferred from the image carrier onto a transfer member using the cleaning member, where R (rpm) is a number of rotations of the cleaning member, L (mm) is a length of the toner pattern in a direction of rotation of the image carrier, and V (mm/s) is a speed of the image carrier.
    Type: Application
    Filed: October 12, 2011
    Publication date: April 26, 2012
    Inventors: Hisashi Kikuchi, Takaya Muraishi, Kenji Sugiura, Akira Asaoka, Yoshiki Hozumi, Yuu Sakakibara
  • Publication number: 20120087704
    Abstract: A cleaning device including a normally charged toner cleaning member provided in contact with a cleaning target at a contact position to remove normally charged toner from the cleaning target, a reversely charged toner cleaning member provided in contact with the cleaning target at a contact position upstream from the normally charged toner cleaning member to remove reversely charged toner from the cleaning target, and a pre-cleaning member provided in contact with the cleaning target at a contact position upstream from both the normally and reversely charged toner cleaning members to remove normally charged toner from the cleaning target. The contact position between the pre-cleaning member and the cleaning target has a width wider than a width of the contact position between the normally charged toner cleaning member and the cleaning target and a width of the contact position between the reversely charged toner cleaning member and the cleaning target.
    Type: Application
    Filed: October 5, 2011
    Publication date: April 12, 2012
    Inventors: Akira Asaoka, Takaya Muraishi, Kenji Sugiura, Hisashi Kikuchi, Yoshiki Hozumi, Yuu Sakakibara
  • Publication number: 20120034006
    Abstract: A cleaning device including: multiple cleaning members arranged consecutively in a direction of movement of a cleaning target to remove adhered substances from the cleaning target; multiple casings to individually hold and at least partially enclose the multiple cleaning members, respectively, the casings and the cleaning members together constituting multiple sub-units; and a sub-unit holder to hold the multiple sub-units, from which the sub-units are individually removable.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 9, 2012
    Inventors: Akira ASAOKA, Takaya MURAISHI, Kenji SUGIURA, Hisashi KIKUCHI, Yoshiki HOZUMI, Yuu SAKAKIBARA
  • Patent number: 8095059
    Abstract: Provided is an image forming apparatus containing: an image-bearing member; a toner removal unit configured to remove a toner remained on the image-bearing member; a coating unit configured to coat a surface of the image-bearing member with a lubricity imparting agent; a unit configured to change a coated state of the lubricity imparting agent which has been applied to the image-bearing member by the coating unit; and a controlling unit configured to control the coating unit so as to operate a coating mode for at least the period when the image-bearing member is rotated once or more in the course of image formation, wherein the coating mode is a mode in which an amount of the lubricity imparting agent applied onto the image-bearing member is increased compared to an applied amount of the lubricity imparting agent during an ordinal operation for image formation.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: January 10, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Shintani, Satoshi Hatori, Yasushi Akiba, Kaoru Yoshino, Akio Kosuge, Takaya Muraishi
  • Publication number: 20110262179
    Abstract: A cleaning roller cleaning a surface of a cleaning component, wherein the cleaning roller is provided in a roller configuration having a cylindrical shape and has a portion in contact with the cleaning component, the portion being made of a melamine resin foam having a continuous foam structure, the melamine resin foam being provided by heating compression from an original configuration in a radial direction, and wherein the portion in contact with the cleaning component has a continuous foam structure and a tensile strength in a range of 1.7±0.5 kg/cm2, and an image forming apparatus incorporating the same.
    Type: Application
    Filed: June 30, 2011
    Publication date: October 27, 2011
    Inventors: Haruji MIZUISHI, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya
  • Patent number: 8000627
    Abstract: The present invention provides a charging device which comprises a charging roller (14a) and a cleaning component (14b). The charging roller charges a surface of an image-recording medium (11) with a voltage which is applied from an external source. The cleaning component cleans a surface of the charging roller. The charging roller includes a resistance adjustment layer which is made of a resin composite and formed on an outer periphery of a core metal. The hardness of the charging roller is 45 degrees or more in JIS D hardness. The cleaning component has a portion which is in contact with the charging roller. This portion is made of resin foam which has a continuous foam structure. The density of the resin foam is 5 to 15 kg/m3 and its tensile strength is 1.7±0.5 kg/cm2.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: August 16, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruji Mizuishi, Tokuya Ojimi, Toshio Koike, Takeshi Shintani, Yuji Arai, Takuzi Yoneda, Ken Amemiya, Takaaki Tawada, Masami Tomita, Masanori Kawasumi, Takaya Muraishi, Hiroomi Harada, Hiromichi Ninomiya