Patents by Inventor Yuuki Aoki

Yuuki Aoki 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: 20240138263
    Abstract: A light emitting element of one or more embodiments includes a first electrode, a second electrode oppositely to the first electrode, and an emission layer between the first electrode and the second electrode. The light emitting element of one or more embodiments includes a polycyclic compound represented by a specific chemical structure in the emission layer, thereby showing improved emission efficiency and life characteristics.
    Type: Application
    Filed: September 18, 2023
    Publication date: April 25, 2024
    Inventors: Makoto YAMAMOTO, Keigo HOSHI, Yuji SUZAKI, Hirokazu KUWABARA, Nobutaka AKASHI, Ryuhei FURUE, Toshiyuki MATSUURA, Yoshiro SUGITA, Yuma AOKI, Yuuki MIYAZAKI
  • Publication number: 20230384730
    Abstract: A powder conveying device includes a drop conveyance passage, an intersecting conveyance passage, a conveying screw, and a floating member. Powder entering from an inflow port drops in the drop conveyance passage. The intersecting conveyance passage communicates with a lower end of the drop conveyance passage and extends in an intersecting direction that intersects the drop conveyance passage. The conveying screw is disposed in the intersecting conveyance passage and rotates in a specified direction to convey the powder in the intersecting direction. The floating member is movably installed in the drop conveyance passage and floats in the drop conveyance passage to move by contact with the conveying screw. The inflow port and the floating member interfere with each other to prevent the floating member from coming out of the inflow port of the drop conveyance passage.
    Type: Application
    Filed: May 23, 2023
    Publication date: November 30, 2023
    Inventors: Kazuhiro SHIMADA, Seiichi KOGURE, Hideki KIMURA, Hiroshi KIKUCHI, Yusuke ISHIZUKA, Yutaka TAKAHASHI, Takuya AKIYAMA, Yutaka GOTO, Yuuki AOKI
  • Patent number: 11789385
    Abstract: An image forming apparatus includes an image bearer; a nip forming member configured to form a transfer nip between the image bearer and the nip forming member; a nip pressure changer configured to change a nip pressure of the transfer nip; a transfer bias applier configured to apply, to the transfer nip, a transfer bias in which an AC component is superimposed on a DC component; and a DC component adjuster configured to adjust the DC component in the transfer bias, according to the nip pressure that is changed by the nip pressure changer.
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: October 17, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuuki Aoki, Seiichi Kogure, Hideki Kimura, Hiroshi Kikuchi, Yutaka Takahashi, Yusuke Ishizuka, Takuya Akiyama, Yutaka Goto, Kazuhiro Shimada
  • Publication number: 20230103454
    Abstract: A transfer device includes a transfer roller and a transfer counter roller. The transfer roller has an elastic layer, contacts with and separates from an image bearer including a belt-shaped elastic body, and nips a recording medium with the image bearer. The transfer counter roller has an elastic layer, is disposed facing the transfer roller, and nips the image bearer with the transfer roller. The transfer counter roller or the transfer roller is applied with a bias to transfer the toner image. Each of the elastic layers of the transfer roller and the transfer counter roller has an Asker C hardness of 75 or less. A difference in thickness between the elastic layers of the transfer roller and the transfer counter roller is ±3% or less.
    Type: Application
    Filed: August 31, 2022
    Publication date: April 6, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroshi Kikuchi, Seiichi Kogure, Hideki Kimura, Yutaka Takahashi, Kazuhiro Shimada, Yusuke Ishizuka, Takuya Akiyama, Yutaka Goto, Yuuki Aoki
  • Publication number: 20230061068
    Abstract: A biasing force adjusting device includes a roller, a roller holder, a first biasing member, and a second biasing member. The roller faces a mover. The roller holder holds the roller and is displaceable with respect to the mover. The first biasing member applies a first biasing force to the roller holder to press the roller against the mover. The second biasing member applies a second biasing force greater than the first biasing force to the roller holder to press the roller against the mover.
    Type: Application
    Filed: August 11, 2022
    Publication date: March 2, 2023
    Inventors: Yutaka GOTO, Seiichi KOGURE, Hiroshi KIKUCHI, Hideki KIMURA, Yutaka TAKAHASHI, Kazuhiro SHIMADA, Yusuke ISHIZUKA, Takuya AKIYAMA, Yuuki AOKI
  • Patent number: 11494602
    Abstract: An image forming apparatus includes a rotatable image bearer, a transfer rotator, a detector, and circuitry. The image bearer bears an image. The transfer rotator transfers the image from the image bearer onto a recording medium sandwiched and conveyed between the image bearer and the transfer rotator. The detector detects length information indicating a length, in a direction of conveyance of the recording medium, of the image on the recording medium. The circuitry corrects a correction value, based on the length information detected by the detector and a target value of the length information, to correct an image magnification, in the direction of conveyance of the recording medium, of the image to be formed on the recording medium. The circuitry controls an image forming operation of forming the image on the recording medium with the correction value.
    Type: Grant
    Filed: August 11, 2021
    Date of Patent: November 8, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takuya Akiyama, Seiichi Kogure, Atsushi Nakamoto, Daisuke Hamada, Yuuki Aoki, Yutaka Goto
  • Publication number: 20220317601
    Abstract: An image forming apparatus includes an image bearer; a nip forming member configured to form a transfer nip between the image bearer and the nip forming member; a nip pressure changer configured to change a nip pressure of the transfer nip; a transfer bias applier configured to apply, to the transfer nip, a transfer bias in which an AC component is superimposed on a DC component; and a DC component adjuster configured to adjust the DC component in the transfer bias, according to the nip pressure that is changed by the nip pressure changer.
    Type: Application
    Filed: March 29, 2022
    Publication date: October 6, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Yuuki Aoki, Seiichi Kogure, Hideki Kimura, Hiroshi Kikuchi, Yutaka Takahashi, Yusuke Ishizuka, Takuya Akiyama, Yutaka Goto, Kazuhiro Shimada
  • Patent number: 11366404
    Abstract: An image forming apparatus includes an image bearer, a transfer rotator, an adjuster, and circuitry. The image bearer bears a toner image. The transfer rotator contacts the image bearer to form a transfer nip between the transfer rotator and the image bearer. The transfer rotator transfers the toner image from the image bearer onto a sheet conveyed to the transfer nip. The adjuster adjusts at least one of a relative difference in linear velocity of the transfer rotator to the image bearer at the transfer nip and a relative contact pressure of the transfer rotator to the image bearer at the transfer nip. Based on a difference in image magnification, in a direction of conveyance of the sheet, of toner images transferred onto surfaces of one or more sheets conveyed to the transfer nip, the circuitry causes the adjuster to reduce the difference in image magnification.
    Type: Grant
    Filed: April 9, 2021
    Date of Patent: June 21, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Atsushi Nakamoto, Seiichi Kogure, Daisuke Hamada, Takuya Akiyama, Yuuki Aoki, Yutaka Goto
  • Publication number: 20220083828
    Abstract: An image forming apparatus includes a rotatable image bearer, a transfer rotator, a detector, and circuitry. The image bearer bears an image. The transfer rotator transfers the image from the image bearer onto a recording medium sandwiched and conveyed between the image bearer and the transfer rotator. The detector detects length information indicating a length, in a direction of conveyance of the recording medium, of the image on the recording medium. The circuitry corrects a correction value, based on the length information detected by the detector and a target value of the length information, to correct an image magnification, in the direction of conveyance of the recording medium, of the image to be formed on the recording medium. The circuitry controls an image forming operation of forming the image on the recording medium with the correction value.
    Type: Application
    Filed: August 11, 2021
    Publication date: March 17, 2022
    Inventors: Takuya AKIYAMA, Seiichi KOGURE, Atsushi NAKAMOTO, Daisuke HAMADA, Yuuki AOKI, Yutaka GOTO
  • Patent number: 11269271
    Abstract: A roller unit includes a roller, an arm, a holder, a tension spring, and a restriction member. The arm rotatably holds the roller. The holder swingably holds the arm. The tension spring includes a first hook at one end of the tension spring and a second hook at another end of the tension spring. The first hook is hooked on an arm-side hook of the arm. The second hook is hooked on a holder-side hook of the holder. The restriction member is configured to restrict movement of the tension spring in a state in which the first hook or the second hook is unhooked.
    Type: Grant
    Filed: January 13, 2021
    Date of Patent: March 8, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yutaka Goto, Seiichi Kogure, Atsushi Nakamoto, Daisuke Hamada, Takuya Akiyama, Yuuki Aoki
  • Publication number: 20210333725
    Abstract: An image forming apparatus includes an image bearer, a transfer rotator, an adjuster, and circuitry. The image bearer bears a toner image. The transfer rotator contacts the image bearer to form a transfer nip between the transfer rotator and the image bearer. The transfer rotator transfers the toner image from the image bearer onto a sheet conveyed to the transfer nip. The adjuster adjusts at least one of a relative difference in linear velocity of the transfer rotator to the image bearer at the transfer nip and a relative contact pressure of the transfer rotator to the image bearer at the transfer nip. Based on a difference in image magnification, in a direction of conveyance of the sheet, of toner images transferred onto surfaces of one or more sheets conveyed to the transfer nip, the circuitry causes the adjuster to reduce the difference in image magnification.
    Type: Application
    Filed: April 9, 2021
    Publication date: October 28, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Atsushi NAKAMOTO, Seiichi KOGURE, Daisuke HAMADA, Takuya AKIYAMA, Yuuki AOKI, Yutaka GOTO
  • Patent number: 11126114
    Abstract: A belt running device includes a plurality of rollers, a belt, a guide, a regulating member, and an abutting member. The belt is wound around the plurality of rollers and configured to rotate. The guide is provided at an end of an inner peripheral surface of the belt. The regulating member is provided at an end of at least one roller of the plurality of rollers in the axial direction of the at least one roller and configured to contact the guide and regulate a movement of the belt in the axial direction of the at least one roller. The abutting member is configured to contact an outer peripheral surface of the belt to press the belt inward in a vicinity of a contact start point at which the guide and the regulating member start to contact when the belt runs.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: September 21, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsushi Nakamoto, Seiichi Kogure, Daisuke Hamada, Takuya Akiyama, Yuuki Aoki, Yutaka Goto
  • Publication number: 20210223721
    Abstract: A roller unit includes a roller, an arm, a holder, a tension spring, and a restriction member. The arm rotatably holds the roller. The holder swingably holds the arm. The tension spring includes a first hook at one end of the tension spring and a second hook at another end of the tension spring. The first hook is hooked on an arm-side hook of the arm. The second hook is hooked on a holder-side hook of the holder. The restriction member is configured to restrict movement of the tension spring in a state in which the first hook or the second hook is unhooked.
    Type: Application
    Filed: January 13, 2021
    Publication date: July 22, 2021
    Inventors: Yutaka GOTO, Seiichi KOGURE, Atsushi NAKAMOTO, Daisuke HAMADA, Takuya AKIYAMA, Yuuki AOKI
  • Publication number: 20210063919
    Abstract: A belt running device includes a plurality of rollers, a belt, a guide, a regulating member, and an abutting member. The belt is wound around the plurality of rollers and configured to rotate. The guide is provided at an end of an inner peripheral surface of the belt. The regulating member is provided at an end of at least one roller of the plurality of rollers in the axial direction of the at least one roller and configured to contact the guide and regulate a movement of the belt in the axial direction of the at least one roller. The abutting member is configured to contact an outer peripheral surface of the belt to press the belt inward in a vicinity of a contact start point at which the guide and the regulating member start to contact when the belt runs.
    Type: Application
    Filed: August 21, 2020
    Publication date: March 4, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Atsushi Nakamoto, Seiichi Kogure, Daisuke Hamada, Takuya Akiyama, Yuuki Aoki, Yutaka Goto
  • Patent number: D765668
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: September 6, 2016
    Assignee: Nikon Corporation
    Inventors: Yuuki Aoki, Kenji Tonegawa, Miho Hara
  • Patent number: D791793
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: July 11, 2017
    Assignee: Nikon Corporation
    Inventors: Yuuki Aoki, Kenji Tonegawa, Miho Hara