Patents by Inventor Yoshiki Yamaguchi

Yoshiki Yamaguchi 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: 10962908
    Abstract: A heating device includes a first rotator, a heater, a second rotator to contact an outer surface of the first rotator, a nip formation pad inside a loop of the first rotator to form a nip, a thermal equalizer to cover a surface of the nip formation pad opposite the first rotator and transport heat in an axial direction of the first rotator, and a lubricant disposed between the thermal equalizer and the first rotator. The thermal equalizer has a plurality of concave portions on a surface opposite the inner surface of the first rotator. The concave portion has a shape substantially symmetrical with respect to a first center line extending in a longitudinal direction of the thermal equalizer and a second center line in a cross section of the concave portion viewed from a direction perpendicular to a direction of movement of the first rotator.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: March 30, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshiki Yamaguchi, Ippei Fujimoto
  • Patent number: 10942475
    Abstract: A fixing device includes a fixing rotator that rotates and includes an inner face. A pressure rotator is disposed opposite the fixing rotator and rotates. A nip former sandwiches the fixing rotator together with the pressure rotator to form a nip between the fixing rotator and the pressure rotator. The nip former includes an outer face disposed opposite the inner face of the fixing rotator. The inner face of the fixing rotator and the outer face of the nip former sandwich a lubricant. At least one of the inner face of the fixing rotator and the outer face of the nip former includes a projection having a volume smaller than 0.3 ml/m2 and a recess having a spatial volume greater than 0.08 ml/m2. The volume and the spatial volume are three-dimensional surface roughness parameters, respectively, defined by the International Organization for Standardization 25178 standard in an initial state before the fixing rotator rotates.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: March 9, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Ippei Fujimoto, Yoshiki Yamaguchi, Takashi Seto, Hiroyuki Shimada
  • Publication number: 20200409292
    Abstract: A fixing device includes a fixing rotator that rotates and includes an inner face. A pressure rotator is disposed opposite the fixing rotator and rotates. A nip former sandwiches the fixing rotator together with the pressure rotator to form a nip between the fixing rotator and the pressure rotator. The nip former includes an outer face disposed opposite the inner face of the fixing rotator. The inner face of the fixing rotator and the outer face of the nip former sandwich a lubricant. At least one of the inner face of the fixing rotator and the outer face of the nip former includes a projection having a volume smaller than 0.3 ml/m2 and a recess having a spatial volume greater than 0.08 ml/m2. The volume and the spatial volume are three-dimensional surface roughness parameters, respectively, defined by the International Organization for Standardization 25178 standard in an initial state before the fixing rotator rotates.
    Type: Application
    Filed: April 28, 2020
    Publication date: December 31, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Ippei FUJIMOTO, Yoshiki YAMAGUCHI, Takashi SETO, Hiroyuki SHIMADA
  • Publication number: 20200387094
    Abstract: A heating device includes a first rotator, a heater, a second rotator to contact an outer surface of the first rotator, a nip formation pad inside a loop of the first rotator to form a nip, a thermal equalizer to cover a surface of the nip formation pad opposite the first rotator and transport heat in an axial direction of the first rotator, and a lubricant disposed between the thermal equalizer and the first rotator. The thermal equalizer has a plurality of concave portions on a surface opposite the inner surface of the first rotator. The concave portion has a shape substantially symmetrical with respect to a first center line extending in a longitudinal direction of the thermal equalizer and a second center line in a cross section of the concave portion viewed from a direction perpendicular to a direction of movement of the first rotator.
    Type: Application
    Filed: April 14, 2020
    Publication date: December 10, 2020
    Inventors: Yoshiki YAMAGUCHI, lppei FUJIMOTO
  • Patent number: 10845740
    Abstract: A temperature detector for being positioned with respect to a counterpart includes a temperature detecting element that detects a temperature of a detecting target and a holding body that holds the temperature detecting element. A projecting engagement engages the counterpart and is mounted on the holding body.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: November 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuusuke Furuichi, Hiroshi Seo, Yoshiki Yamaguchi
  • Patent number: 10782637
    Abstract: A fixing device includes a fixing rotator, a pressure rotator, a heat source, a nip formation pad, and a support. The nip formation pad presses against the pressure rotator to form a fixing nip between the fixing rotator and the pressure rotator. The support supports the nip formation pad toward the fixing nip. A longitudinal end portion of the pressure rotator has an outer diameter greater than that of a longitudinal center portion of the pressure rotator. The pressure rotator includes a grip that contacts the nip formation pad via the fixing rotator outside a recording medium with a maximum width conveyable passing through the fixing nip and applies a frictional force to the fixing rotator. The nip formation pad includes a nip face having an inflection point from which a longitudinal direction of the nip face is curved toward the support within an area opposite the grip.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: September 22, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Ippei Fujimoto, Yoshiki Yamaguchi
  • Publication number: 20200292974
    Abstract: A fixing device includes a fixing rotator, a pressure rotator, a heat source, a nip formation pad, and a support. The nip formation pad presses against the pressure rotator to form a fixing nip between the fixing rotator and the pressure rotator. The support supports the nip formation pad toward the fixing nip. A longitudinal end portion of the pressure rotator has an outer diameter greater than that of a longitudinal center portion of the pressure rotator. The pressure rotator includes a grip that contacts the nip formation pad via the fixing rotator outside a recording medium with a maximum width conveyable passing through the fixing nip and applies a frictional force to the fixing rotator. The nip formation pad includes a nip face having an inflection point from which a longitudinal direction of the nip face is curved toward the support within an area opposite the grip.
    Type: Application
    Filed: February 27, 2020
    Publication date: September 17, 2020
    Inventors: Ippei FUJIMOTO, Yoshiki Yamaguchi
  • Publication number: 20200285182
    Abstract: A nip forming member includes a base material and a thermal conductive member that overlaps the base material and has a higher thermal conductivity than a thermal conductivity of the base material. The base material has protrusions projecting to one side or another side in a short direction on a part of a longitudinal direction on both sides in the short direction. The thermal conductive member has fitting holes into which the protrusions are fitted in both sides in the short direction.
    Type: Application
    Filed: March 6, 2020
    Publication date: September 10, 2020
    Inventors: Yoshiharu Takahashi, Naoki Iwaya, Hitoshi Fujiwara, lppei Fujimoto, Yoshiki Yamaguchi
  • Publication number: 20200271740
    Abstract: Provided is an orientation agent for NMR spectroscopy containing a nanosheet which is easy to prepare, excellent in handleability, economic efficiency and versatility, and is capable of being stably aligned to the magnetic field. The nanosheet is coated with a compound having a molecular weight of 1,500 or more and containing 35 or more functional groups per molecule, said functional groups being composed of at least one selected from a hydroxy group, an amino group, an amide group, a carbonyl group, a carboxyl group, a sulfo group, a phosphate group, an imidazole group and a guanidine group.
    Type: Application
    Filed: May 22, 2018
    Publication date: August 27, 2020
    Applicants: RIKEN, NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Noriyuki UCHIDA, Yasuhiro ISHIDA, Kento UENO, Zhifang SUN, Qiaochu LI, Yoshiki YAMAGUCHI, Takayoshi SASAKI, Yasuo EBINA, Takuzo AIDA
  • Patent number: 10691049
    Abstract: A fixing device includes a fixing rotator and a pressure rotator that is disposed opposite the fixing rotator. A nip former is disposed inside a loop formed by the fixing rotator and disposed opposite the pressure rotator via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. The fixing rotator slides over the nip former. A flange supports the fixing rotator at both lateral ends of the fixing rotator in a longitudinal direction of the fixing rotator. The nip former includes a base and a thermal conductor that has a thermal conductivity greater than a thermal conductivity of the base. The base is greater than the thermal conductor in the longitudinal direction of the fixing rotator. The base includes a groove that is disposed outboard at least from the thermal conductor in the longitudinal direction of the fixing rotator.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: June 23, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Ippei Fujimoto, Hiroyuki Shimada, Yoshiki Yamaguchi, Takashi Seto, Takayuki Seki
  • Publication number: 20200183307
    Abstract: A temperature detector for being positioned with respect to a counterpart includes a temperature detecting element that detects a temperature of a detecting target and a holding body that holds the temperature detecting element. A projecting engagement engages the counterpart and is mounted on the holding body.
    Type: Application
    Filed: October 18, 2019
    Publication date: June 11, 2020
    Inventors: Yuusuke FURUICHI, Hiroshi SEO, Yoshiki YAMAGUCHI
  • Patent number: 10571837
    Abstract: A fixing device includes a fixing rotator that is flexible, endless, and rotatable. A heater heats the fixing rotator. A pressure rotator is disposed opposite the fixing rotator. A nip former defines a fixing nip between the fixing rotator and the pressure rotator. A support supports the nip former. The nip former includes a back face that contacts the support and has a nonlinear shape in a longitudinal direction of the nip former.
    Type: Grant
    Filed: January 4, 2019
    Date of Patent: February 25, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yoshiki Yamaguchi, Ippei Fujimoto, Hiroyuki Shimada, Takayuki Seki, Takashi Seto, Yoshiyuki Fukuda, Hiroshi Yoshinaga
  • Publication number: 20200033777
    Abstract: A fixing device includes a fixing rotator and a pressure rotator that is disposed opposite the fixing rotator. A nip former is disposed inside a loop formed by the fixing rotator and disposed opposite the pressure rotator via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. The fixing rotator slides over the nip former. A flange supports the fixing rotator at both lateral ends of the fixing rotator in a longitudinal direction of the fixing rotator. The nip former includes a base and a thermal conductor that has a thermal conductivity greater than a thermal conductivity of the base. The base is greater than the thermal conductor in the longitudinal direction of the fixing rotator. The base includes a groove that is disposed outboard at least from the thermal conductor in the longitudinal direction of the fixing rotator.
    Type: Application
    Filed: May 22, 2019
    Publication date: January 30, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Ippei FUJIMOTO, Hiroyuki SHIMADA, Yoshiki YAMAGUCHI, Takashi SETO, Takayuki SEKI
  • Publication number: 20190286025
    Abstract: A fixing device includes a fixing rotator that is flexible, endless, and rotatable. A heater heats the fixing rotator. A pressure rotator is disposed opposite the fixing rotator. A nip former defines a fixing nip between the fixing rotator and the pressure rotator. A support supports the nip former. The nip former includes a back face that contacts the support and has a nonlinear shape in a longitudinal direction of the nip former.
    Type: Application
    Filed: January 4, 2019
    Publication date: September 19, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Yoshiki YAMAGUCHI, lppei FUJIMOTO, Hiroyuki SHIMADA, Takayuki SEKI, Takashi SETO, Yoshiyuki FUKUDA, Hiroshi YOSHINAGA
  • Publication number: 20190177440
    Abstract: The present invention provides a new compound having excellent safety which can be used as an anti-inflammatory agent, an anti-cancer agent against lung cancer, and the like. The compound or the salt thereof of the present invention is a compound represented by Formula (A) or Formula (B): where: X1 is a hexose or a hydroxyl group, and X2 is a phosphate group or a hydroxyl group.
    Type: Application
    Filed: September 13, 2017
    Publication date: June 13, 2019
    Inventors: Nobuhiro TODA, Yasuhiro HIDAKA, Akiyoshi HAYASHI, Takashi NISHIZAWA, Shinichiro NAKAMURA, Osamu KANIE, Yoshiki YAMAGUCHI
  • Publication number: 20190113528
    Abstract: An object of the present invention is to develop a biomarker for discriminating dementia, particularly, Alzheimer's disease and mild cognitive impairment which can progress to Alzheimer's disease, from other central nervous system diseases, or capable of determining a pathological condition of dementia, and provide a method for diagnosing dementia early and a method for determining a pathological condition of dementia, using the biomarker. A transferrin glycoprotein containing a glycan having at least one mannose at a non-reducing end or a transferrin fragment containing the glycan is used as a diagnostic marker for Alzheimer's disease.
    Type: Application
    Filed: May 9, 2017
    Publication date: April 18, 2019
    Inventors: Yasuhiro HASHIMOTO, Kyoka HOSHI, Hiromi ITO, Takashi HONDA, Yoshiki YAMAGUCHI, Masamichi NAGAE
  • Patent number: 10176659
    Abstract: A paper sheet authentication apparatus determines the type of the paper sheet by using a characteristic other than a fluorescent light characteristic, sequentially emits excitation lights of different wavelengths on the paper sheet, measures an intensity of light per wavelength within a predetermined range emitted by a fluorescent material applied to the paper sheet, and acquires fluorescent light characteristic data as the result. The paper sheet authentication apparatus performs the authentication of the paper sheet by using fluorescent light characteristic data of a genuine paper sheet previously stored per type of the paper sheet or a threshold calculated therefrom and the acquired fluorescent light characteristic data.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: January 8, 2019
    Assignee: GLORY LTD.
    Inventors: Yoshiki Yamaguchi, Takeshi Sato
  • Patent number: 10001735
    Abstract: A fixing device may include an endless fixing member; a heater inside the fixing member; and a nip forming unit configured to form a nip through which a recording sheet is conveyed, the nip forming unit including a supporting member and a contact member supported by the supporting member, the supporting member including at least one contact surface and the contact member including a plurality of protrusions protruding towards the supporting member such that two or more of the plurality of protrusions are configured to contact one of the at least one contact surface of the supporting member, each of the plurality of protrusions having a height associated there with such that the height of the plurality of protrusions increases in a direction from ends of the contact member towards a center of the contact member.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: June 19, 2018
    Assignee: Ricoh Company, Limited
    Inventors: Takahiro Imada, Masaaki Yoshikawa, Kenji Ishii, Hiroshi Yoshinaga, Yuji Arai, Naoki Iwaya, Tetsuo Tokuda, Hiromasa Takagi, Yoshiki Yamaguchi, Ippei Fujimoto, Takuya Seshita, Yutaka Ikebuchi, Arinobu Yoshiura, Toshihiko Shimokawa, Hajime Gotoh
  • Patent number: 9983526
    Abstract: A fixing device includes a heat source; a fixing member looped into a generally cylindrical shape to rotate in a circumferential direction thereof and partially heated by the heat source and to heat a surface of a recording medium bearing an unfixed toner image to fix the unfixed toner image thereon in a fixing process; a rotary pressing member disposed facing the fixing member to form a nip therebetween, through which the recording medium is transported in a transport direction; and a rotation driver to rotate one of the fixing member and the pressing member. In a case in which the fixing member is halted for a reason other than the fixing process while power of the fixing device is on, electric power is not supplied to the heat source and the fixing member is rotated by a predetermined amount or more after the fixing member is halted.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: May 29, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeshi Uchitani, Masahiko Satoh, Kenji Ishii, Tadashi Ogawa, Teppei Kawata, Arinobu Yoshiura, Toshihiko Shimokawa, Kensuke Yamaji, Takamasa Hase, Shuutaroh Yuasa, Masaaki Yoshikawa, Hiromasa Takagi, Takahiro Imada, Hajime Gotoh, Akira Suzuki, Takuya Seshita, Hiroshi Yoshinaga, Kazuya Saito, Shinichi Namekata, Takayuki Seki, Yuji Arai, Ryuuichi Mimbu, Yoshiki Yamaguchi, Shuntaroh Tamaki, Yutaka Ikebuchi
  • Patent number: 9811043
    Abstract: An image forming apparatus includes an image forming device to transfer an image to a recording sheet; a fixing device to feed the recording sheet and fix the image onto the recording sheet; a branching device to switch between an ejection path to eject the recording sheet fed downstream of the fixing device, to outside the apparatus, and a reversing path for duplex printing; and a back curl correction structure disposed in a sheet feeding path between the fixing device and the branching device. The back curl correction structure includes a drive roller; a driven roller; an auxiliary nip portion; a guide member; and a guide moving device to move the guide member to a first position and a second position depending on the condition of the recording sheet.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: November 7, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryuuichi Mimbu, Yoshio Hattori, Haruyuki Honda, Toshihiko Shimokawa, Yoshiki Yamaguchi