Patents by Inventor Bunro Noguchi
Bunro Noguchi 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).
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Patent number: 11635705Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: GrantFiled: April 8, 2022Date of Patent: April 25, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Bunro Noguchi, Hisashi Yamauchi
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Publication number: 20230091090Abstract: An image forming apparatus comprising: an image bearing member, a developing member that forms a toner image with a toner including a metal soap having a polarity opposite to that of the toner, a supply member that supplies the toner to the developing member, and a control unit that executes a metal soap supply operation of supplying the metal soap from the developing member to the image bearing member when an operation other than the image forming operation is executed, wherein the metal soap supply operation includes a first mode and a second mode, and a potential difference between the supply member and the developing member, which causes an electrostatic force in the direction from the supply member to the developing member to act on the metal soap, is smaller in the metal soap supply operation in the second mode than in the first mode.Type: ApplicationFiled: September 8, 2022Publication date: March 23, 2023Inventors: Hisashi Taniguchi, Bunro Noguchi, Shinichi Agata, Kodai Hayashi, Keitaro Nakata
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Publication number: 20230093245Abstract: An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.Type: ApplicationFiled: November 9, 2022Publication date: March 23, 2023Inventors: Atsushi Toda, Hisashi Taniguchi, Bunro Noguchi, Shunsuke Matsushita
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Patent number: 11579556Abstract: An image forming apparatus includes first and second image forming portions and a belt. The first and second image forming portions include first and second image bearing members, and first and second transferring members, respectively. The belt nips and feeds a recording material. The first image forming portion is disposed upstream of the second image forming portion in a moving direction of the recording material, and a plurality of members including the first and second image bearing members are integrally assembled and are mountable on or dismountable from a main assembly of the image forming apparatus. A film thickness of a surface of the first image bearing member is larger than a film thickness of a surface of the second image bearing member, circumferential speed ratios or contact pressures of rotating components differ, and/or mass ratios of components of respective developers differ.Type: GrantFiled: February 10, 2022Date of Patent: February 14, 2023Assignee: Canon Kabushiki KaishaInventors: Kazunori Hashimoto, Bunro Noguchi, Keitaro Nakata
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Patent number: 11526115Abstract: An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein a diameter of the transfer roller is greater than a diameter of the development roller and the diameter of the transfer roller is greater than a diameter of the cleaning roller.Type: GrantFiled: November 23, 2021Date of Patent: December 13, 2022Assignee: Canon Kabushiki KaishaInventors: Atsushi Toda, Hisashi Taniguchi, Bunro Noguchi, Shunsuke Matsushita
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Publication number: 20220269214Abstract: An image forming apparatus includes first and second image forming portions and a belt. The first and second image forming portions include first and second image bearing members, and first and second transferring members, respectively. The belt nips and feeds a recording material between itself and the first image bearing member and between itself and the second image bearing member in a first transferring portion and a second transferring portion, respectively. The first image forming portion is disposed upstream of the second image forming portion in a moving direction of the recording material, and a plurality of members including the first and second image bearing members are integrally assembled and are mountable on or dismountable from a main assembly of the image forming apparatus. A film thickness of a surface of the first image bearing member is larger than a film thickness of a surface of the second image bearing member.Type: ApplicationFiled: February 10, 2022Publication date: August 25, 2022Inventors: Kazunori Hashimoto, Bunro Noguchi, Keitaro Nakata
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Publication number: 20220236661Abstract: An image forming apparatus includes a photosensitive member, a charging member for charging the photosensitive member, a cleaning member that comes into contact with the charging member and moves relative to the charging member to clean the charging member, an opening/closing member for exposing an inside of the apparatus, and a driving mechanism that moves the charging member and the cleaning member relative to each other in association with opening/closing of the opening/closing member.Type: ApplicationFiled: April 15, 2022Publication date: July 28, 2022Inventors: Bunro Noguchi, Hisashi Taniguchi, Atsushi Toda, Shunsuke Matsushita
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Publication number: 20220229380Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: ApplicationFiled: April 8, 2022Publication date: July 21, 2022Inventors: Bunro Noguchi, Hisashi Yamauchi
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Patent number: 11333992Abstract: An image forming apparatus includes a photosensitive member, a charging member for charging the photosensitive member, a cleaning member that comes into contact with the charging member and moves relative to the charging member to clean the charging member, an opening/closing member for exposing an inside of the apparatus, and a driving mechanism that moves the charging member and the cleaning member relative to each other in association with opening/closing of the opening/closing member.Type: GrantFiled: June 10, 2021Date of Patent: May 17, 2022Assignee: Canon Kabushiki KaishaInventors: Bunro Noguchi, Hisashi Taniguchi, Atsushi Toda, Shunsuke Matsushita
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Patent number: 11327415Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: GrantFiled: September 16, 2020Date of Patent: May 10, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Bunro Noguchi, Hisashi Yamauchi
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Publication number: 20220082987Abstract: An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.Type: ApplicationFiled: November 23, 2021Publication date: March 17, 2022Inventors: Atsushi Toda, Hisashi Taniguchi, Bunro Noguchi, Shunsuke Matsushita
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Patent number: 11209768Abstract: An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.Type: GrantFiled: March 22, 2021Date of Patent: December 28, 2021Assignee: Canon Kabushiki KaishaInventors: Atsushi Toda, Hisashi Taniguchi, Bunro Noguchi, Shunsuke Matsushita
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Publication number: 20210389689Abstract: An image forming apparatus includes a photosensitive member, a charging member for charging the photosensitive member, a cleaning member that comes into contact with the charging member and moves relative to the charging member to clean the charging member, an opening/closing member for exposing an inside of the apparatus, and a driving mechanism that moves the charging member and the cleaning member relative to each other in association with opening/closing of the opening/closing member.Type: ApplicationFiled: June 10, 2021Publication date: December 16, 2021Inventors: Bunro Noguchi, Hisashi Taniguchi, Atsushi Toda, Shunsuke Matsushita
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Publication number: 20210302902Abstract: An image forming apparatus includes a photosensitive drum, a development roller configured to supply developer to the photosensitive drum, a transfer roller configured to transfer a developer image formed on the photosensitive drum to a recording material, and a cleaning roller being in contact with the photosensitive drum, configured to clean a part of the recording material adhered to the photosensitive drum, wherein the diameter of the transfer roller is greater than the diameter of the development roller and the diameter of the cleaning roller is greater than the diameter of the development roller.Type: ApplicationFiled: March 22, 2021Publication date: September 30, 2021Inventors: Atsushi Toda, Hisashi Taniguchi, Bunro Noguchi, Shunsuke Matsushita
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Patent number: 11079712Abstract: An image forming apparatus including a holding apparatus configured to collect residual developer remaining on an intermediate transfer belt and temporarily hold the residual developer, and a cleaning member configured to remove toner borne on the photosensitive drum that moves the toner held by the holding apparatus to the intermediate transfer belt and discharging the toner. Toner from a development roller is supplied to the cleaning member before toner reversely transferred from the intermediate transfer belt is supplied to the cleaning member.Type: GrantFiled: June 24, 2019Date of Patent: August 3, 2021Assignee: Canon Kabushiki KaishaInventors: Bunro Noguchi, Taku Watanabe, Yusaku Iwasawa, Yuichiro Hirata
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Publication number: 20200409287Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: ApplicationFiled: September 16, 2020Publication date: December 31, 2020Inventors: Bunro Noguchi, Hisashi Yamauchi
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Patent number: 10802418Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: GrantFiled: September 5, 2019Date of Patent: October 13, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Bunro Noguchi, Hisashi Yamauchi
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Publication number: 20200004194Abstract: An image forming apparatus including a holding apparatus configured to collect residual developer remaining on an intermediate transfer belt and temporarily hold the residual developer, and a cleaning member configured to remove toner borne on the photosensitive drum that moves the toner held by the holding apparatus to the intermediate transfer belt and discharging the toner. Toner from a development roller is supplied to the cleaning member before toner reversely transferred from the intermediate transfer belt is supplied to the cleaning member.Type: ApplicationFiled: June 24, 2019Publication date: January 2, 2020Inventors: Bunro Noguchi, Taku Watanabe, Yusaku Iwasawa, Yuichiro Hirata
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Publication number: 20190391509Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.Type: ApplicationFiled: September 5, 2019Publication date: December 26, 2019Inventors: Bunro Noguchi, Hisashi Yamauchi
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Patent number: 10444701Abstract: Provided are a drive force transmission member and control unit. The drive force transmission member has multiple first engaging portions. Drive force is transmitted from the drive force transmission member to a drive force receiving member with each first engaging portion engaged with a second engaging portion of the drive force receiving member. The second engaging portions are movable in a radial direction centered on a rotation axis line of the drive force transmission member. The control unit performs rotation control of forward rotation of the drive force transmission member by ?° and thereafter backward rotation by ?° after a cartridge is mounted to an apparatus main body but before image formation. Each of the multiple first engaging portions is upstream in the forward rotation direction of the drive force transmission member from the second engaging portion out of the multiple second engaging portions with which engaging will be realized.Type: GrantFiled: February 9, 2018Date of Patent: October 15, 2019Assignee: Canon Kabushiki KaishaInventors: Toshiaki Takeuchi, Takahito Ueno, Masaki Seto, Bunro Noguchi