Patents by Inventor Tatsuya Yamaai
Tatsuya Yamaai 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: 10983449Abstract: A method for manufacturing an electrophotographic photoconductor including a charge generating layer and a charge transport layer in this order on a cylindrical electrically-conductive support including the steps of: (i) immersing the support in a charge generating layer coating liquid, (ii) pulling the support out of the coating liquid, (iii) heat drying the support coated with the coating liquid to form the charge generating layer, (iv) cooling the charge generating layer, and (v) immersing the support on which the charge generating layer has been formed in a charge transport layer coating liquid while retaining gas inside of the support. The charge transport layer coating liquid contains a solvent having a boiling point of 34° C. or more and 85° C. or less, and the step (v) satisfies two specific conditions.Type: GrantFiled: March 24, 2020Date of Patent: April 20, 2021Assignee: Canon Kabushiki KaishaInventors: Akihiro Maruyama, Kazuko Araki, Daisuke Miura, Tatsuya Yamaai, Hiroto Hirayama, Shinobu Iijima, Daisuke Kawaguchi, Takahiro Nagase, Takahisa Taniguchi, Shintarou Goto, Taneyuki Kinoshita
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Publication number: 20200310262Abstract: A method for manufacturing an electrophotographic photoconductor including a charge generating layer and a charge transport layer in this order on a cylindrical electrically-conductive support including the steps of: (i) immersing the support in a charge generating layer coating liquid, (ii) pulling the support out of the coating liquid, (iii) heat drying the support coated with the coating liquid to form the charge generating layer, (iv) cooling the charge generating layer, and (v) immersing the support on which the charge generating layer has been formed in a charge transport layer coating liquid while retaining gas inside of the support. The charge transport layer coating liquid contains a solvent having a boiling point of 34° C. or more and 85° C. or less, and the step (v) satisfies two specific conditions.Type: ApplicationFiled: March 24, 2020Publication date: October 1, 2020Inventors: Akihiro Maruyama, Kazuko Araki, Daisuke Miura, Tatsuya Yamaai, Hiroto Hirayama, Shinobu Iijima, Daisuke Kawaguchi, Takahiro Nagase, Takahisa Taniguchi, Shintarou Goto, Taneyuki Kinoshita
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Patent number: 10663913Abstract: Provided is a process cartridge having a charging member and an electrophotographic photosensitive member to be charged by being in contact with the charging member, wherein the electrophotographic photosensitive member has a support and a photosensitive layer in this order, and a surface layer of the electrophotographic photosensitive member has a Martens hardness of 230 N/mm2 or less.Type: GrantFiled: November 21, 2018Date of Patent: May 26, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Tatsuya Yamaai, Kazunori Noguchi, Shuhei Iwasaki, Akira Sakakibara, Daisuke Miura, Harunobu Ogaki, Takumi Furukawa, Yuya Tomomizu
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Patent number: 10545453Abstract: Provided are a process cartridge and an electrophotographic apparatus each suppressed in fluctuation in charging potential at the time of its long-term use. The process cartridge includes: an electrophotographic photosensitive member having a surface layer containing a resin and a charge-transporting substance; and a charging member configured to charge the electrophotographic photosensitive member, wherein an average of Martens hardnesses of the surface layer of the electrophotographic photosensitive member measured at a pushing force of 7 mN is 245 N/mm2 or more, and wherein in a core defined by three-dimensional surface texture standards (ISO 25178-2:2012) of the surface of the charging member, an average of Martens hardnesses measured at a pushing force of 0.04 mN is 2 N/mm2 or more and 20 N/mm2 or less, and an average of adhesivenesses measured with a scanning probe microscope in a field of view of 2-micrometer square is 70 mV or less.Type: GrantFiled: November 20, 2018Date of Patent: January 28, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Shuhei Iwasaki, Kazunori Noguchi, Harunobu Ogaki, Tatsuya Yamaai, Daisuke Miura, Akira Sakakibara, Takumi Furukawa, Yuya Tomomizu
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Patent number: 10452021Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.Type: GrantFiled: November 21, 2018Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
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Patent number: 10416581Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups.Type: GrantFiled: August 3, 2017Date of Patent: September 17, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yota Ito, Tsutomu Nishida, Shoma Hinata, Tatsuya Yamaai, Akira Sakakibara, Daisuke Miura
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Publication number: 20190163119Abstract: Provided is a process cartridge having a charging member and an electrophotographic photosensitive member to be charged by being in contact with the charging member, wherein the electrophotographic photosensitive member has a support and a photosensitive layer in this order, and a surface layer of the electrophotographic photosensitive member has a Martens hardness of 230 N/mm2 or less.Type: ApplicationFiled: November 21, 2018Publication date: May 30, 2019Inventors: Tatsuya Yamaai, Kazunori Noguchi, Shuhei Iwasaki, Akira Sakakibara, Daisuke Miura, Harunobu Ogaki, Takumi Furukawa, Yuya Tomomizu
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Publication number: 20190163120Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.Type: ApplicationFiled: November 21, 2018Publication date: May 30, 2019Inventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
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Publication number: 20190163118Abstract: Provided are a process cartridge and an electrophotographic apparatus each suppressed in fluctuation in charging potential at the time of its long-term use. The process cartridge includes: an electrophotographic photosensitive member having a surface layer containing a resin and a charge-transporting substance; and a charging member configured to charge the electrophotographic photosensitive member, wherein an average of Martens hardnesses of the surface layer of the electrophotographic photosensitive member measured at a pushing force of 7 mN is 245 N/mm2 or more, and wherein in a core defined by three-dimensional surface texture standards (ISO 25178-2:2012) of the surface of the charging member, an average of Martens hardnesses measured at a pushing force of 0.04 mN is 2 N/mm2 or more and 20 N/mm2 or less, and an average of adhesivenesses measured with a scanning probe microscope in a field of view of 2-micrometer square is 70 mV or less.Type: ApplicationFiled: November 20, 2018Publication date: May 30, 2019Inventors: Shuhei Iwasaki, Kazunori Noguchi, Harunobu Ogaki, Tatsuya Yamaai, Daisuke Miura, Akira Sakakibara, Takumi Furukawa, Yuya Tomomizu
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Publication number: 20190121251Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.Type: ApplicationFiled: December 21, 2018Publication date: April 25, 2019Inventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
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Patent number: 10209637Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.Type: GrantFiled: July 28, 2017Date of Patent: February 19, 2019Assignee: Canon Kabushiki KaishaInventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
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Publication number: 20180059558Abstract: An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups.Type: ApplicationFiled: August 3, 2017Publication date: March 1, 2018Inventors: Yota Ito, Tsutomu Nishida, Shoma Hinata, Tatsuya Yamaai, Akira Sakakibara, Daisuke Miura
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Publication number: 20180031985Abstract: An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.Type: ApplicationFiled: July 28, 2017Publication date: February 1, 2018Inventors: Tsutomu Nishida, Akira Sakakibara, Daisuke Miura, Yota Ito, Shoma Hinata, Tatsuya Yamaai, Nobuo Kosaka
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Patent number: 9864284Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B.Type: GrantFiled: February 25, 2016Date of Patent: January 9, 2018Assignee: Canon Kabushiki KaishaInventors: Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka, Hiroyuki Tomono, Shoma Hinata, Yota Ito, Daisuke Miura, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama
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Patent number: 9753385Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).Type: GrantFiled: February 25, 2016Date of Patent: September 5, 2017Assignee: Canon Kabushiki KaishaInventors: Yota Ito, Daisuke Miura, Shoma Hinata, Hiroyuki Tomono, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama, Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka
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Patent number: 9581920Abstract: Provided is coating film-removing method for removing unnecessary coating film on outer peripheral surface of lower side of cylindrical substrate by dip coating, the method comprising: supplying solvent to inside of substrate; causing, through use of outer peripheral surface coating film-removing member configured to remove coating film at portion to be subjected to coating film removal in outer peripheral surface of the substrate, the outer peripheral surface coating film-removing member to abut against region ranging from upper end to lower end of coating film at the portion; and removing, under a state wherein the outer peripheral surface coating film-removing member abuts against the region, the coating film at the portion through rubbing by relatively rotating the substrate and the outer peripheral surface coating film-removing member while supplying the solvent, which is supplied to inside and then flows to lower end of the substrate, to abutting portion.Type: GrantFiled: January 14, 2016Date of Patent: February 28, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Nobuhiro Nakamura, Kazuko Sakuma, Takahisa Taniguchi, Tatsuya Yamaai, Atsushi Fujii, Akihiro Maruyama, Atsushi Okuda, Yuka Ishiduka, Kazunori Noguchi, Yuki Yamamoto
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Publication number: 20160252829Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).Type: ApplicationFiled: February 25, 2016Publication date: September 1, 2016Inventors: Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka, Hiroyuki Tomono, Shoma Hinata, Yota Ito, Daisuke Miura, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama
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Publication number: 20160252830Abstract: An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B (groups A and B defined in the disclosure).Type: ApplicationFiled: February 25, 2016Publication date: September 1, 2016Inventors: Yota Ito, Daisuke Miura, Shoma Hinata, Hiroyuki Tomono, Takashi Anezaki, Tatsuya Yamaai, Kazumichi Sugiyama, Masataka Kawahara, Hirotoshi Uesugi, Akihiro Maruyama, Hirofumi Kumoi, Masato Tanaka
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Publication number: 20160216619Abstract: Provided is coating film-removing method for removing unnecessary coating film on outer peripheral surface of lower side of cylindrical substrate by dip coating, the method comprising: supplying solvent to inside of substrate; causing, through use of outer peripheral surface coating film-removing member configured to remove coating film at portion to be subjected to coating film removal in outer peripheral surface of the substrate, the outer peripheral surface coating film-removing member to abut against region ranging from upper end to lower end of coating film at the portion; and removing, under a state wherein the outer peripheral surface coating film-removing member abuts against the region, the coating film at the portion through rubbing by relatively rotating the substrate and the outer peripheral surface coating film-removing member while supplying the solvent, which is supplied to inside and then flows to lower end of the substrate, to abutting portion.Type: ApplicationFiled: January 14, 2016Publication date: July 28, 2016Inventors: Nobuhiro Nakamura, Kazuko Sakuma, Takahisa Taniguchi, Tatsuya Yamaai, Atsushi Fujii, Akihiro Maruyama, Atsushi Okuda, Yuka Ishiduka, Kazunori Noguchi, Yuki Yamamoto