Patents by Inventor Tomohiko Kohda

Tomohiko Kohda 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: 20230330999
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Application
    Filed: June 21, 2023
    Publication date: October 19, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 11724514
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Grant
    Filed: April 26, 2022
    Date of Patent: August 15, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Patent number: 11420447
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Grant
    Filed: May 22, 2020
    Date of Patent: August 23, 2022
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Publication number: 20220250392
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Application
    Filed: April 26, 2022
    Publication date: August 11, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 11331930
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Grant
    Filed: February 24, 2021
    Date of Patent: May 17, 2022
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Publication number: 20210178776
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Application
    Filed: February 24, 2021
    Publication date: June 17, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 10786996
    Abstract: A liquid discharge head includes a channel section, and a driving section. The channel section supplies a liquid to a plurality of nozzles to discharge the liquid. The driving section causes the nozzles to discharge the liquid. The channel section includes an individual chamber to supply the liquid to the nozzles and a common chamber to supply the liquid to the individual chamber. A laminated portion of each of a plurality of plate-shaped components which are constituent components of the individual chamber does not have a cut-out portion in a portion corresponding to a bonding position of a damper member disposed between the individual chamber and the common chamber.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: September 29, 2020
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomohiko Kohda
  • Publication number: 20200282740
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Application
    Filed: May 22, 2020
    Publication date: September 10, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 10730292
    Abstract: A liquid discharge head includes a plurality of nozzles, a plurality of individual liquid chambers, a common liquid chamber, a deformable damper, and a damper chamber. The plurality of nozzles is arrayed in a nozzle array direction, to discharge liquid. The plurality of individual liquid chambers is communicated with the plurality of nozzles. The common liquid chamber supplies liquid to the plurality of individual liquid chambers. The deformable damper constitutes part of a wall face of the common liquid chamber. The damper chamber is disposed along the nozzle array direction with the damper interposed between the damper chamber and the common liquid chamber. The damper chamber extends to an outer area in the nozzle array direction than an individual liquid chamber of the plurality of individual liquid chambers at each end in the nozzle array direction.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: August 4, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiko Kohda, Satoru Tobita, Ryo Kasahara, Ryohta Matsufuji, Norimasa Sohgawa
  • Patent number: 10696057
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: June 30, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Patent number: 10668726
    Abstract: A liquid ejection head is provided. The liquid ejection head includes at least two nozzle lines configured to have a plurality of nozzles for ejecting liquid disposed in respective lines, a plurality of individual liquid chambers configured to be in communication with corresponding nozzles of the nozzle lines, and at least two circulation channels corresponding to the nozzle lines, configured to be in communication with the individual liquid chambers. The at least two circulation channels are in communication with each other through a bridging channel disposed in a direction intersecting with the nozzle line direction, and the bridging channel and the circulation channels are disposed at different positions in a thickness direction of a member which forms the bridging channel and the circulation channels.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: June 2, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takahiro Yoshida, Tomohiko Kohda, Takeshi Shimizu, Kanshi Abe, Ryo Kasahara, Takayuki Nakai, Shiomi Andou
  • Publication number: 20200094573
    Abstract: A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.
    Type: Application
    Filed: November 26, 2019
    Publication date: March 26, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 10538101
    Abstract: A liquid discharging head includes: a nozzle plate having a plurality of nozzles from which liquid is discharged; a channel member including a plurality of individual liquid chambers that lead to the plurality of nozzles, respectively, and including a plurality of circulation channels that lead to the plurality of individual liquid chambers, respectively; and a common liquid chamber member for forming a common liquid chamber that supplies liquid to the plurality of individual liquid chambers and for forming a circulation common liquid chamber that leads to the plurality of circulation channels.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: January 21, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Publication number: 20190283436
    Abstract: A liquid discharge head includes a channel section, and a driving section. The channel section supplies a liquid to a plurality of nozzles to discharge the liquid. The driving section causes the nozzles to discharge the liquid. The channel section includes an individual chamber to supply the liquid to the nozzles and a common chamber to supply the liquid to the individual chamber. A laminated portion of each of a plurality of plate-shaped components which are constituent components of the individual chamber does not have a cut-out portion in a portion corresponding to a bonding position of a damper member disposed between the individual chamber and the common chamber.
    Type: Application
    Filed: March 15, 2019
    Publication date: September 19, 2019
    Inventor: Tomohiko Kohda
  • Publication number: 20190084313
    Abstract: A liquid discharging head includes: a nozzle plate having a plurality of nozzles from which liquid is discharged; a channel member including a plurality of individual liquid chambers that lead to the plurality of nozzles, respectively, and including a plurality of circulation channels that lead to the plurality of individual liquid chambers, respectively; and a common liquid chamber member for forming a common liquid chamber that supplies liquid to the plurality of individual liquid chambers and for forming a circulation common liquid chamber that leads to the plurality of circulation channels.
    Type: Application
    Filed: November 15, 2018
    Publication date: March 21, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomohiko KOHDA, Takahiro YOSHIDA, Shiomi ANDOU, Takayuki NAKAI, Kanshi ABE, Takeshi SHIMIZU, Ryo KASAHARA
  • Patent number: 10160226
    Abstract: A liquid discharging head includes: a nozzle plate having a plurality of nozzles from which liquid is discharged; a channel member including a plurality of individual liquid chambers that lead to the plurality of nozzles, respectively, and including a plurality of circulation channels that lead to the plurality of individual liquid chambers, respectively; and a common liquid chamber member for forming a common liquid chamber that supplies liquid to the plurality of individual liquid chambers and for forming a circulation common liquid chamber that leads to the plurality of circulation channels.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: December 25, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomohiko Kohda, Takahiro Yoshida, Shiomi Andou, Takayuki Nakai, Kanshi Abe, Takeshi Shimizu, Ryo Kasahara
  • Publication number: 20180290446
    Abstract: A liquid discharge head includes a plurality of nozzles, a plurality of individual liquid chambers, a common liquid chamber, a deformable damper, and a damper chamber. The plurality of nozzles is arrayed in a nozzle array direction, to discharge liquid. The plurality of individual liquid chambers is communicated with the plurality of nozzles. The common liquid chamber supplies liquid to the plurality of individual. liquid chambers. The deformable damper constitutes part of a wall face of the common liquid chamber. The damper chamber is disposed along the nozzle array direction with the damper interposed between the damper chamber and the common liquid chamber. The damper chamber extends to an outer area in the nozzle array direction than an individual liquid chamber of the plurality of individual liquid chambers at each end in the nozzle array direction.
    Type: Application
    Filed: June 15, 2018
    Publication date: October 11, 2018
    Applicant: RICOH COMPANY, LTD.
    Inventors: Tomohiko KOHDA, Satoru TOBITA, Ryo KASAHARA, Ryohta MATSUFUJI, Norimasa SOHGAWA
  • Publication number: 20180257374
    Abstract: A liquid ejection head is provided. The liquid ejection head includes at least two nozzle lines configured to have a plurality of nozzles for ejecting liquid disposed in respective lines, a plurality of individual liquid chambers configured to be in communication with corresponding nozzles of the nozzle lines, and at least two circulation channels corresponding to the nozzle lines, configured to be in communication with the individual liquid chambers. The at least two circulation channels are in communication with each other through a bridging channel disposed in a direction intersecting with the nozzle line direction, and the bridging channel and the circulation channels are disposed at different positions in a thickness direction of a member which forms the bridging channel and the circulation channels.
    Type: Application
    Filed: May 16, 2018
    Publication date: September 13, 2018
    Applicant: RICOH COMPANY, LTD.
    Inventors: Takahiro YOSHIDA, Tomohiko KOHDA, Takeshi SHIMIZU, Kanshi ABE, Ryo KASAHARA, Takayuki NAKAI, Shiomi ANDOU
  • Patent number: 10022963
    Abstract: A liquid discharge head includes a plurality of nozzles, a plurality of individual liquid chambers, a common liquid chamber, a deformable damper, and a damper chamber. The plurality of nozzles is arrayed in a nozzle array direction, to discharge liquid. The plurality of individual liquid chambers is communicated with the plurality of nozzles. The common liquid chamber supplies liquid to the plurality of individual liquid chambers. The deformable damper constitutes part of a wall face of the common liquid chamber. The damper chamber is disposed along the nozzle array direction with the damper interposed between the damper chamber and the common liquid chamber. The damper chamber extends to an outer area in the nozzle array direction than an individual liquid chamber of the plurality of individual liquid chambers at each end in the nozzle array direction.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: July 17, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomohiko Kohda, Satoru Tobita, Ryo Kasahara, Ryohta Matsufuji, Norimasa Sohgawa
  • Patent number: 10005281
    Abstract: A liquid ejection head is provided. The liquid ejection head includes at least two nozzle lines configured to have a plurality of nozzles for ejecting liquid disposed in respective lines, a plurality of individual liquid chambers configured to be in communication with corresponding nozzles of the nozzle lines, and at least two circulation channels corresponding to the nozzle lines, configured to be in communication with the individual liquid chambers. The at least two circulation channels are in communication with each other through a bridging channel disposed in a direction intersecting with the nozzle line direction, and the bridging channel and the circulation channels are disposed at different positions in a thickness direction of a member which forms the bridging channel and the circulation channels.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: June 26, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takahiro Yoshida, Tomohiko Kohda, Takeshi Shimizu, Kanshi Abe, Ryo Kasahara, Takayuki Nakai, Shiomi Andou