Patents by Inventor Yasunobu Ogata

Yasunobu Ogata 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: 20210116843
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: December 29, 2020
    Publication date: April 22, 2021
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 10915040
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Grant
    Filed: December 26, 2019
    Date of Patent: February 9, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Publication number: 20200133164
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: December 26, 2019
    Publication date: April 30, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 10564572
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Grant
    Filed: April 30, 2019
    Date of Patent: February 18, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Publication number: 20190258191
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: April 30, 2019
    Publication date: August 22, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 10365584
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: July 30, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Patent number: 10317817
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: June 11, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Publication number: 20180253032
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: May 4, 2018
    Publication date: September 6, 2018
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 10025227
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: July 17, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Publication number: 20170219957
    Abstract: A toner container is detachably attachable to a developing device. The developing device includes an inlet to be poured with a toner, an inlet shutter to move between a closed position, at which the inlet is closed, and an open position, at which the inlet is open, a biasing mechanism to bias the inlet shutter toward the closed position, an engaged structure provided in the inlet shutter, an engaging structure to engage with the engaged structure and to retain the inlet shutter at the open position against a biasing force of the biasing mechanism, and an engagement releasing structure provided in the inlet shutter and to release an engaging state between the engaged structure and the engaging structure. The toner container includes a contacting surface to contact with the engagement releasing structure and to make the engagement releasing structure release the engaging state.
    Type: Application
    Filed: April 18, 2017
    Publication date: August 3, 2017
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 9690231
    Abstract: A toner container includes a container body that is used to house a toner and that is detachably attachable to a mounting portion in a developing device; and an operating member that is used to open and close a shutter. The shutter as well as the operating member includes an engaging portion that can engage with a linking member which is disposed in the mounting portion and which can perform a reciprocating linear movement. In the state in which the container body is not mounted in the mounting portion, the shutter and the operating member are in a non-linked state with each other. In contrast, in the state in which the container body is mounted in the mounting portion, the shutter and the operating member become able to be linked to each other via the linking member.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: June 27, 2017
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Tomofumi Yoshida, Kohta Sakaya, Shinichi Arasawa, Jin Sam Park, Goo Chul Jung, Yasunobu Ogata
  • Publication number: 20160189836
    Abstract: The present invention relates to Fe16N2 particles in the form of a single phase which are obtained by subjecting iron oxide or iron oxyhydroxide whose surface may be coated with at least alumina or silica, if required, as a starting material, to reducing treatment and nitridation treatment, a process for producing the Fe16N2 particles in the form of a single phase for a heat treatment time of not more than 36 hr, and further relates to an anisotropic magnet or a bonded magnet which is obtained by magnetically orienting the Fe16N2 particles in the form of a single phase. The Fe16N2 particles according to the present invention can be produced in an industrial scale and have a large BHmax value.
    Type: Application
    Filed: March 3, 2016
    Publication date: June 30, 2016
    Inventors: Migaku TAKAHASHI, Tomoyuki OGAWA, Yasunobu OGATA, Naoya KOBAYASHI
  • Patent number: 9378876
    Abstract: Ferromagnetic particles including an Fe16N2 compound phase in an amount of not less than 80% as measured by Mössbauer spectrum and each having an outer shell in which FeO is present in the form of a film having a thickness of not more than 5 nm. Ferromagnetic particles may be made by subjecting iron oxide or iron oxyhydroxide having an average major axis diameter of 40 to 5000 nm and an aspect ratio (major axis diameter/minor axis diameter) of 1 to 200 as a starting material to dispersing treatment to prepare aggregated particles; subjecting the iron compound particles passed through a mesh to hydrogen reducing treatment at a temperature of 160 to 420° C.; and then subjecting the resulting particles to nitridation treatment at a temperature of 130 to 170° C.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: June 28, 2016
    Assignees: TODA KOGYO CORPORATION, TOHOKU UNIVERSITY
    Inventors: Migaku Takahashi, Tomoyuki Ogawa, Yasunobu Ogata, Naoya Kobayashi, Chammika Ruwan Polwatta Gallage, Kaori Kohara
  • Publication number: 20160109827
    Abstract: A toner container includes a container body that is used to house a toner and that is detachably attachable to a mounting portion in a developing device; and an operating member that is used to open and close a shutter. The shutter as well as the operating member includes an engaging portion that can engage with a linking member which is disposed in the mounting portion and which can perform a reciprocating linear movement. In the state in which the container body is not mounted in the mounting portion, the shutter and the operating member are in a non-linked state with each other. In contrast, in the state in which the container body is mounted in the mounting portion, the shutter and the operating member become able to be linked to each other via the linking member.
    Type: Application
    Filed: May 30, 2014
    Publication date: April 21, 2016
    Inventors: Tomofumi YOSHIDA, Kohta SAKAYA, Shinichi ARASAWA, Jin Sam PARK, Goo Chul JUNG, Yasunobu OGATA
  • Patent number: 9261816
    Abstract: A developer amount detector to detect an amount of developer inside a developer container includes a light-emitting element; a light-receiving element; a first light guide including a first end disposed to face the light-emitting element and a second end disposed inside the developer container, covered with a translucent cover including a light-emitting face; a second light guide including a first end disposed to face the light-receiving element, a second end disposed inside the developer container, covered with a translucent cover including a light-receiving face to face the light-emitting face across a gap; and a cleaner including a sliding portion to slidingly contact the light-emitting face and the light-receiving face. The cover of each of the first and second light guides includes a material lower in chargeability with the sliding portion than a material of a body of each of the first and second light guides.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: February 16, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohta Sakaya, Shinichi Arasawa, Yasuhide Ohkubo, Yasunobu Ogata
  • Publication number: 20150132018
    Abstract: A developer amount detector to detect an amount of developer inside a developer container includes a light-emitting element; a light-receiving element; a first light guide including a first end disposed to face the light-emitting element and a second end disposed inside the developer container, covered with a translucent cover including a light-emitting face; a second light guide including a first end disposed to face the light-receiving element, a second end disposed inside the developer container, covered with a translucent cover including a light-receiving face to face the light-emitting face across a gap; and a cleaner including a sliding portion to slidingly contact the light-emitting face and the light-receiving face. The cover of each of the first and second light guides includes a material lower in chargeability with the sliding portion than a material of a body of each of the first and second light guides.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 14, 2015
    Inventors: Kohta SAKAYA, Shinichi ARASAWA, Yasuhide OHKUBO, Yasunobu OGATA
  • Patent number: 9014593
    Abstract: A sealing assembly to contact a rotator includes a sealing member to slidably contact a surface of an end of the rotator in an axial direction of the rotator. The sealing member has an end in a circumferential direction thereof to contact the surface of the rotator with a first pressure. The end in the circumferential direction is fixed to a bearing surface formed on the opening on at least one of an upstream side and a downstream side in a rotation direction of the rotator. The sealing member has an intermediate portion between an upstream end and a downstream end in the circumferential direction to contact the surface of the rotator with a second pressure lower than the first pressure.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: April 21, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasunobu Ogata, Tetsumaru Fujita, Rie Mitani, Takahiro Sanada
  • Publication number: 20140153958
    Abstract: A sealing assembly to contact a rotator includes a sealing member to slidably contact a surface of an end of the rotator in an axial direction of the rotator. The sealing member has an end in a circumferential direction thereof to contact the surface of the rotator with a first pressure. The end in the circumferential direction is fixed to a bearing surface formed on the opening on at least one of an upstream side and a downstream side in a rotation direction of the rotator. The sealing member has an intermediate portion between an upstream end and a downstream end in the circumferential direction to contact the surface of the rotator with a second pressure lower than the first pressure.
    Type: Application
    Filed: November 20, 2013
    Publication date: June 5, 2014
    Inventors: Yasunobu OGATA, Tetsumaru Fujita, Rie Mitani, Takahiro Sanada
  • Publication number: 20140085023
    Abstract: The present invention relates to ferromagnetic particles capable of exhibiting a high purity and excellent magnetic properties from the industrial viewpoints and a process for producing the ferromagnetic particles, and also provides an anisotropic magnet, a bonded magnet and a compacted magnet which are obtained by using the ferromagnetic particles. The ferromagnetic particles comprising an Fe16N2 compound phase in an amount of not less than 80% as measured by Mössbauer spectrum and each having an outer shell in which FeO is present in the form of a layer having a thickness of not more than 5 nm according to the present invention can be produced by subjecting aggregated particles of an iron compound as a starting material whose primary particles have a ratio of [(average deviation of major axis lengths of particles)/(average major axis length of particles)] of not more than 50%, Uc of not more than 1.55, Cg of not less than 0.95, Cg2 of not less than 0.
    Type: Application
    Filed: April 26, 2012
    Publication date: March 27, 2014
    Applicants: TOHOKU UNIVERSITY, TODA KOGYO CORPORATION
    Inventors: Migaku Takahashi, Tomoyuki Ogawa, Yasunobu Ogata, Naoya Kobayashi, Chammika Ruwan Polwatta Gallage, Kaori Kohara
  • Publication number: 20140001398
    Abstract: The present invention relates to ferromagnetic particles capable of exhibiting a high purity and excellent magnetic properties from the industrial viewpoints and a process for producing the ferromagnetic particles, and also provides an anisotropic magnet, a bonded magnet and a compacted magnet which are obtained by using the ferromagnetic particles.
    Type: Application
    Filed: January 19, 2012
    Publication date: January 2, 2014
    Applicant: TOHOKU UNIVERSITY
    Inventors: Migaku Takahashi, Tomoyuki Ogawa, Yasunobu Ogata, Naoya Kobayashi, Chammika Ruwan Polwatta Gallage, Kaori Kohara