Patents by Inventor Hiroshi Yoshinaga

Hiroshi Yoshinaga 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).

  • Publication number: 20210311420
    Abstract: A fixing device includes a fixing rotator that rotates in a rotation direction and a pressure rotator that presses against the fixing rotator to form a nip between the fixing rotator and the pressure rotator, through which a recording medium bearing a toner image formed with glitter toner is conveyed. A brush includes a loop that contacts a surface of the fixing rotator.
    Type: Application
    Filed: March 9, 2021
    Publication date: October 7, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroshi YOSHINAGA, Takamasa HASE
  • Patent number: 11099509
    Abstract: A fixing device includes an endless belt that rotates and is heated by a heat source. A thermal conduction aid includes a contact portion, an upstream bent portion, and a downstream bent portion. The contact portion contacts the endless belt. The upstream bent portion and the downstream bent portion are disposed upstream and downstream from the contact portion in a rotation direction of the endless belt, respectively, and are extended in a longitudinal direction of the thermal conduction aid. A recess is disposed in at least one of the upstream bent portion and the downstream bent portion. The recess spans a center of the thermal conduction aid in the longitudinal direction thereof and is recessed from an edge of the at least one of the upstream bent portion and the downstream bent portion in a short direction thereof.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: August 24, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Ippei Fujimoto, Yoshiki Yamaguchi, Takashi Seto, Hiroshi Yoshinaga
  • Publication number: 20210223730
    Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.
    Type: Application
    Filed: April 8, 2021
    Publication date: July 22, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Takamasa HASE, Hiroshi YOSHINAGA, Takeshi UCHITANI, Yutaka IKEBUCHI, Takuya SESHITA, Shuutaroh YUASA
  • Publication number: 20210191301
    Abstract: A fixing device includes an endless belt that rotates and is heated by a heat source. A thermal conduction aid includes a contact portion, an upstream bent portion, and a downstream bent portion. The contact portion contacts the endless belt. The upstream bent portion and the downstream bent portion are disposed upstream and downstream from the contact portion in a rotation direction of the endless belt, respectively, and are extended in a longitudinal direction of the thermal conduction aid. A recess is disposed in at least one of the upstream bent portion and the downstream bent portion. The recess spans a center of the thermal conduction aid in the longitudinal direction thereof and is recessed from an edge of the at least one of the upstream bent portion and the downstream bent portion in a short direction thereof.
    Type: Application
    Filed: December 3, 2020
    Publication date: June 24, 2021
    Inventors: Ippei FUJIMOTO, Yoshiki YAMAGUCHI, Takashi SETO, Hiroshi YOSHINAGA
  • Patent number: 11003119
    Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: May 11, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Takamasa Hase, Hiroshi Yoshinaga, Takeshi Uchitani, Yutaka Ikebuchi, Takuya Seshita, Shuutaroh Yuasa
  • Patent number: 10935911
    Abstract: A fixing device includes an endless belt rotatable in a predetermined direction of rotation and a nip formation assembly disposed opposite an inner circumferential surface of the endless belt. An opposed rotary body is pressed against the nip formation assembly via the endless belt to form a fixing nip between the endless belt and the opposed rotary body through which a recording medium bearing a toner image is conveyed. A belt holder contacts and supports each lateral end of the endless belt in an axial direction thereof. The belt holder is isolated from the opposed rotary body with a first interval interposed therebetween in the axial direction of the endless belt.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: March 2, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Teppei Kawata, Masahiko Satoh, Masaaki Yoshikawa, Kenji Ishii, Hiroshi Yoshinaga, Tadashi Ogawa, Takahiro Imada, Hiromasa Takagi, Kazuya Saito, Naoki Iwaya, Kensuke Yamaji, Takamasa Hase, Toshihiko Shimokawa, Shuutaroh Yuasa, Takuya Seshita, Takeshi Uchitani, Arinobu Yoshiura, Hajime Gotoh, Akira Suzuki
  • Patent number: 10928763
    Abstract: A fixing device includes a rotator that rotates and a fixing device cover. The fixing device cover includes an interior face that is disposed opposite the rotator, a first aperture that is disposed opposite the rotator, and a recess that surrounds the first aperture and extends in a gravity direction. A frame is interposed between the interior face of the fixing device cover and the rotator. The frame includes a second aperture that is disposed opposite the rotator and the first aperture. A rib is mounted on the frame and extends from the second aperture toward the interior face of the fixing device cover.
    Type: Grant
    Filed: April 10, 2020
    Date of Patent: February 23, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Shimada, Hiroshi Yoshinaga, Hitoshi Fujiwara
  • Publication number: 20200341419
    Abstract: A fixing device includes a rotator that rotates and a fixing device cover. The fixing device cover includes an interior face that is disposed opposite the rotator, a first aperture that is disposed opposite the rotator, and a recess that surrounds the first aperture and extends in a gravity direction. A frame is interposed between the interior face of the fixing device cover and the rotator. The frame includes a second aperture that is disposed opposite the rotator and the first aperture. A rib is mounted on the frame and extends from the second aperture toward the interior face of the fixing device cover.
    Type: Application
    Filed: April 10, 2020
    Publication date: October 29, 2020
    Inventors: Hiroyuki SHIMADA, Hiroshi YOSHINAGA, Hitoshi FUJIWARA
  • Patent number: 10809652
    Abstract: A fixing device includes a first rotator, a second rotator disposed opposite the first rotator to form a nip with the first rotator, a heater including a base and a heat generator, and a non-contact temperature detector to detect a temperature of the heater. The heater contacts an inner circumferential surface of the first rotator. The non-contact temperature detector is disposed opposite the inner circumferential surface of the first rotator via the base and disposed at a predetermined distance from the heater.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: October 20, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yoshinaga, Tomoya Adachi, Yuusuke Furuichi, Yukimichi Someya, Mitsuko Sugano
  • Publication number: 20200117126
    Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.
    Type: Application
    Filed: December 13, 2019
    Publication date: April 16, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Takamasa HASE, Hiroshi Yoshinaga, Takeshi Uchitani, Yutaka Ikebuchi, Takuya Seshita, Shuutaroh Yuasa
  • 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
  • Patent number: 10551777
    Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: February 4, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takamasa Hase, Hiroshi Yoshinaga, Takeshi Uchitani, Yutaka Ikebuchi, Takuya Seshita, Shuutaroh Yuasa
  • Publication number: 20200033776
    Abstract: A fixing device includes a first rotator, a second rotator disposed opposite the first rotator to form a nip with the first rotator, a heater including a base and a heat generator, and a non-contact temperature detector to detect a temperature of the heater. The heater contacts an inner circumferential surface of the first rotator. The non-contact temperature detector is disposed opposite the inner circumferential surface of the first rotator via the base and disposed at a predetermined distance from the heater.
    Type: Application
    Filed: July 24, 2019
    Publication date: January 30, 2020
    Inventors: Hiroshi YOSHINAGA, Tomoya ADACHI, Yuusuke FURUICHI, Yukimichi SOMEYA, Mitsuko SUGANO
  • Patent number: 10527981
    Abstract: A fixing device includes a rotatable pressing roller, a fixing rotator to rotate in contact with the pressing roller, a nip formation pad, and a slide sheet disposed between the nip formation pad and the fixing rotator. The slide sheet includes a base material layer made of a woven fabric of spun yarn. In the base material layer, a distance between adjacent spun yarns is equal to or less than 0.4 times a width of the spun yarn in a cross-section of the slide sheet in a direction of slide movement of the fixing rotator, and, in a cross-section of the slide sheet in a longitudinal direction of the slide sheet and a direction perpendicular to the slide movement of the fixing rotator, a thickness of the spun yarn is equal to or greater than 0.2 times a width of the spun yarn.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: January 7, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Yutaka Naitoh, Hiroshi Yoshinaga, Daisuke Inoue, Natsuki Watanabe, Takahiro Imada
  • Publication number: 20190377286
    Abstract: A fixing device includes a rotatable pressing roller, a fixing rotator to rotate in contact with the pressing roller, a nip formation pad, and a slide sheet disposed between the nip formation pad and the fixing rotator. The slide sheet includes a base material layer made of a woven fabric of spun yarn. In the base material layer, a distance between adjacent spun yarns is equal to or less than 0.4 times a width of the spun yarn in a cross-section of the slide sheet in a direction of slide movement of the fixing rotator, and, in a cross-section of the slide sheet in a longitudinal direction of the slide sheet and a direction perpendicular to the slide movement of the fixing rotator, a thickness of the spun yarn is equal to or greater than 0.2 times a width of the spun yarn.
    Type: Application
    Filed: April 30, 2019
    Publication date: December 12, 2019
    Inventors: Yutaka Naitoh, Hiroshi Yoshinaga, Daisuke Inoue, Natsuki Watanabe, Takahiro Imada
  • Patent number: 10488798
    Abstract: A fixing device includes an endless fixing rotator, a heater, a nip formation assembly, and an opposed rotator. The endless fixing rotator is rotatable in a direction of rotation. The heater heats the fixing rotator. The nip formation assembly is disposed opposite an inner circumferential surface of the fixing rotator. The opposed rotator is pressed against the nip formation assembly via the fixing rotator to form a fixing nip between the fixing rotator and the opposed rotator. The nip formation assembly includes a nip former to contact the inner circumferential surface of the fixing rotator, maintain a constant thickness against pressure from the opposed rotator, and transfer heat. The opposed rotator is shorter than the nip former in a longitudinal direction of the opposed rotator. The opposed rotator is disposed within an area opposite the nip former.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: November 26, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroshi Yoshinaga, Ippei Fujimoto, Kenji Ishii, Takayuki Seki, Kazunari Sawada, Ryohei Matsuda
  • 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
  • Patent number: 10331062
    Abstract: An image forming apparatus includes a fixing device that includes a heater to heat a fixing rotator, an opposed rotator to press against the fixing rotator to form a fixing nip therebetween, and at least one rotary body to convey a recording medium to the fixing nip. A controller rotates the fixing rotator in a forward direction to fix a toner image on the recording medium. The controller stops the heater and rotates the fixing rotator in a predetermined rotation direction when a failure occurs while the fixing device is activated. The controller determines that the predetermined rotation direction is the forward direction or a backward direction according to the at least one rotary body that sandwiches the recording medium, if the fixing nip and the at least one rotary body sandwich the recording medium simultaneously when the failure occurs while the fixing device is activated.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: June 25, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yoshinaga, Kenji Ishii, Hiroyuki Shimada, Ippei Fujimoto, Takashi Seto, Takayuki Seki, Kazunari Sawada
  • Patent number: 10317823
    Abstract: A fixing device includes a fixing rotator and a lateral end heater to heat a lateral end span of the fixing rotator in an axial direction thereof. A thermal conduction aid contacts the fixing rotator. A nip formation pad contacts the thermal conduction aid. A lateral end temperature detector detects a temperature of the fixing rotator in a lateral end detection span in the axial direction of the fixing rotator. The thermal conduction aid contacts the nip formation pad in a first span including the lateral end detection span in the axial direction of the fixing rotator with a first contact area. The thermal conduction aid contacts the nip formation pad in a second span disposed outboard from the first span in the axial direction of the fixing rotator with a second contact area smaller than the first contact area.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: June 11, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Ippei Fujimoto, Hiroshi Yoshinaga, Kenji Ishii, Hiroyuki Shimada, Takashi Seto, Takayuki Seki, Kazunari Sawada
  • Patent number: 10295937
    Abstract: A fixing device includes a heat generator being disposed inside a loop formed by a rotator and including a heat generating portion to radiate radiant heat. A reflector is disposed inside the loop formed by the rotator and includes a reflection face to reflect the radiant heat radiated from the heat generator toward the rotator. A support supports the reflector. A holder holds each lateral end of the support in a longitudinal direction of the support, which is perpendicular to the rotation direction of the rotator. A fastener attaches the reflector to the support at an attachment position disposed at each lateral end of the reflector in a longitudinal direction of the reflector. The attachment position is disposed outboard from a lateral edge of the heat generating portion of the heat generator and disposed inboard from the holder in the longitudinal direction of the reflector.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: May 21, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazunari Sawada, Ippei Fujimoto, Kenji Ishii, Hiroyuki Shimada, Takashi Seto, Hiroshi Yoshinaga, Takayuki Seki