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公开(公告)号：US11675282B2
公开(公告)日：2023-06-13
申请号：US16838328
申请日：2020-04-02
Applicant: CANON KABUSHIKI KAISHA
Inventor： Sosuke Yamaguchi , Masaki Yamada , Kazuhiro Yamauchi , Satoru Nishioka , Taichi Shintou
Abstract: The present invention provides an electrophotographic member having excellent deformation recovery even when stored or used under a high temperature and high humidity environment, which is useful in forming a high-quality electrophotographic image; a process cartridge; and an electrophotographic apparatus. The electrophotographic member of the present invention includes a conductive mandrel and an electro-conductive layer; the electro-conductive layer including a resin synthesized from an ion conducting agent and a compound being able to react with the ion conducting agent; the ion conducting agent including a specific anion and a cation having at least three hydroxyl groups; the compound being able to react with the hydroxyl group.
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公开(公告)号：US20220244658A1
公开(公告)日：2022-08-04
申请号：US17658685
申请日：2022-04-11
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masaki Yamada , Yuichi Kikuchi , Kenji Takashima , Tetsuo Hino , Kazuhiro Yamauchi , Takumi Furukawa
Abstract: Provided is an electrophotographic electro-conductive member including a support having an electro-conductive outer surface, and an electro-conductive layer. The electro-conductive layer has a matrix containing a crosslinked product of a first rubber and domains containing a crosslinked product of a second rubber and an electron conductive agent. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electro-conductive layer while changing a frequency, a slope at specific frequencies is −0.8 to −0.3 in a double logarithmic plot, and an impedance at specific frequency range is 1.0×104Ω to 1.0×1011Ω. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electrophotographic electro-conductive member while changing a frequency, an impedance at specific frequency range is 1.0×105Ω to 1.0×1011Ω.
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公开(公告)号：US11366402B2
公开(公告)日：2022-06-21
申请号：US17070054
申请日：2020-10-14
Applicant: CANON KABUSHIKI KAISHA
Inventor： Yuka Ishiduka , Tsutomu Nishida , Hideharu Shimozawa , Nobuhiro Nakamura , Hiroyuki Watanabe , Kenichi Kaku , Kazuhiro Yamauchi , Yuichi Kikuchi , Kazuhisa Shida , Atsushi Okuda
Abstract: There is provided a process cartridge detachably attachable to a main body of an electrophotographic apparatus, the process cartridge including an electrophotographic photosensitive member and a charging member, wherein an outer surface of the charging member is composed of at least a matrix and at least a part of domains, a volume resistivity of the matrix is 1.0×105 times or more of a volume resistivity of the domain, an average value Sd of circle equivalent diameters of the domains observed on the outer surface of the charging member is in a predetermined range, the electrophotographic photosensitive member contains a support, a photosensitive layer, and a protective layer in this order and when a surface roughness of the protective layer is measured, each of a protruding valley portion Rvk, a load length ratio Mr2, and Sd/Rvk is in a predetermined range.
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公开(公告)号：US11347156B2
公开(公告)日：2022-05-31
申请号：US16825611
申请日：2020-03-20
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masahiro Kurachi , Kazuhiro Yamauchi , Satoru Nishioka , Kenji Takashima , Yuichi Kikuchi
Abstract: The electro-conductive member has an electro-conductive support, and an electro-conductive layer in this order, the electro-conductive layer including a matrix and domains, the matrix constituted by a first rubber composition containing a cross-linked product of a first rubber, the domains having electro-conductivity, and dispersed in the matrix, each of the domains constituted by a second rubber composition containing a cross-linked product of a second rubber and an electro-conductive particle, the first rubber and the second rubber being diene-based rubbers, the first rubber having at least one monomer unit, the second rubber having at least one monomer unit different from the monomer unit which the first rubber has; a difference of absolute values of SP values between the first rubber and the second rubber is 0.2 (J/cm3)0.5 to 4.0 (J/cm3)0.5; and a tan δ1/tan δ2 is 0.45 to 2.00.
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公开(公告)号：US11340553B2
公开(公告)日：2022-05-24
申请号：US17070179
申请日：2020-10-14
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kaname Watariguchi , Kohei Makisumi , Fumiyuki Hiyama , Yuichi Kikuchi , Kazuhiro Yamauchi , Hirotaka Araki , Seiichi Miyazawa
Abstract: The process cartridge includes an electrophotographic photosensitive member having a first support and a photosensitive layer; and a charging member. In the photosensitive member when an electric current is measured which flows when a voltage is applied to a surface while being varied, a gradient a1 of a low electric field region and a gradient a2 of a high electric field region satisfy a2/a1≥1.50, in a graph. The charging member includes a second support having an electroconductive outer surface, and a second electroconductive layer including a matrix and a plurality of domains being dispersed in the matrix, at least a portion of the domain is exposed to an outer surface which includes at least the matrix and at least a portion of the domain, and a volume resistivity ρM of the matrix is 1.00×105 times or higher of a volume resistivity ρD of the domain.
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Patent Agency Ranking
6.发明授权公开(公告)号：US11175602B2
公开(公告)日：2021-11-16
申请号：US17072206
申请日：2020-10-16
Applicant: CANON KABUSHIKI KAISHA
Inventor： Satoru Nishioka , Masahiro Kurachi , Kenji Takashima , Yuichi Kikuchi , Kazuhiro Yamauchi , Kana Sato , Takumi Furukawa , Hiroaki Watanabe , Kenya Terada , Yuya Tomomizu , Toshimitsu Nakazawa
Abstract: An electroconductive member for electrophotography has an electroconductive support and an electroconductive layer in the order mentioned. The electroconductive layer has a matrix including a crosslinked product of a first rubber, and a domain including a crosslinked product of a second rubber and an electroconductive particle. The impedance of an outer surface of the electroconductive member is 1.0×103 to 1.0×108Ω. 80% by number or more of domains observed at each of a total of nine 15-μm square observation regions, which are disposed at any three points in a thickness region from the outer surface to a specific depth on each of cross sections in a thickness direction at three points: the center of the electroconductive layer in the longitudinal direction and points at a specific distance from both edges of the electroconductive layer toward the center, satisfy specific requirements.
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公开(公告)号：US20210116856A1
公开(公告)日：2021-04-22
申请号：US17068971
申请日：2020-10-13
Applicant: CANON KABUSHIKI KAISHA
Inventor： Takashi Mukai , Takashi Hiramatsu , Shuhei Tokiwa , Takayuki Namiki , Takumi Furukawa , Yuichi Kikuchi , Kazuhiro Yamauchi
Abstract: A process cartridge is provided, which is configured to recover, with a developing member, developer remaining on an image bearing member after transfer of a developer image to a transfer receiving member, wherein a charging member has a shaft that is conductive and an elastic layer supported on the shaft and being in contact with the image bearing member; the elastic layer has a matrix containing a first rubber, and a plurality of domains containing a second rubber and an electron-conductive agent and interspersed within the matrix. The electric resistance of the domains is lower than the electric resistance of the matrix. The matrix is exposed on an outer surface of the elastic layer and forms multiple depressed portions, and the domains include a domains exposed at a bottom section of the depressed portion.
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公开(公告)号：US20210116854A1
公开(公告)日：2021-04-22
申请号：US17065258
申请日：2020-10-07
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kohei Makisumi , Kaname Watariguchi , Fumiyuki Hiyama , Kazuhiro Yamauchi , Yuichi Kikuchi
Abstract: Provided is a process cartridge in which lateral running is suppressed while satisfactory potential fluctuation is maintained. The process cartridge includes: an electrophotographic photosensitive member including a support, a lowermost layer, and a photosensitive layer; and a charging member including a support and a conductive layer. In a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the lowermost layer while changing the AC voltage, is represented by fOPC (Hz), and in a case where a maximum frequency at which a phase of an impedance reaches 45°, when the impedance is measured by applying an AC voltage to the charging member while changing the AC voltage, is represented by fC (Hz), the fOPC and the fC each have a value within a certain range.
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公开(公告)号：US20210116832A1
公开(公告)日：2021-04-22
申请号：US17071109
申请日：2020-10-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Shohei Kototani , Noriyoshi Umeda , Tsuneyoshi Tominaga , Shohei Tsuda , Noboru Miyagawa , Kazuhiro Yamauchi
Abstract: An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging unit, and a developing unit, wherein the charging unit has a conductive member contactable with the electrophotographic photosensitive member, and a conductive layer of the conductive member has a matrix-domain structure; at least some of the domains are exposed at the outer surface; a volume resistivity R1 of the matrix and a volume resistivity R2 of the domains satisfy specific relationship; Martens hardness G1 of the matrix and Martens hardness G2 of the domains satisfy relationship G1
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公开(公告)号：US20210116829A1
公开(公告)日：2021-04-22
申请号：US17071535
申请日：2020-10-15
Applicant: CANON KABUSHIKI KAISHA
Inventor： Hiroyuki Tomono , Yoshitaka Suzumura , Takuya Mizuguchi , Osamu Matsushita , Masahiro Kurachi , Kazuhiro Yamauchi , Issei Imamura
Abstract: An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging device and a developing device, wherein the charging device comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member, the conductive layer at the outer surface of the conductive member comprises a matrix and a plurality of domains dispersed in the matrix, at least some of the domains are exposed at the outer surface of the conductive member, the matrix has a volume resistivity R1 of larger than 1.00×1012 Ω·cm, the volume resistivity R1 of the matrix is 1.0×105 times or more a volume resistivity R2 of the domains, the developing device comprises the toner comprising a toner particle and a silica fine particle, and a coverage ratio of the toner surface with the silica fine particles is from 62.0% by area to 100.0% by area as determined by X-ray photoelectron spectroscopy.
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