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1.发明申请公开(公告)号：US20180314173A1
公开(公告)日：2018-11-01
申请号：US15960916
申请日：2018-04-24
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuyoshi Shimada , Kumiko Takizawa , Eileen Takeuchi , Ikuyo Kuroiwa , Wataru Kitamura , Kan Tanabe , Haruhiko Mitsuda
CPC classification number: G03G7/0086 , B82Y30/00 , G03F7/092 , G03G5/144 , G03G15/0216 , G03G15/75
Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus that are excellent in charging properties and can suppress residual potential in the case where a strontium titanate particle is used as a metal oxide particle in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member in which an undercoat layer contains a strontium titanate particle having a maximum peak at a position of 2θ=32.20±0.20 (θ represents a Bragg angle) in a CuKα characteristic X-ray diffraction pattern, the maximum peak having a half-value width of 0.10 deg or more and 0.50 deg or less, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
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公开(公告)号：US20170285499A1
公开(公告)日：2017-10-05
申请号：US15469935
申请日：2017-03-27
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuyoshi Shimada , Ryoichi Tokimitsu , Mai Murakami , Kan Tanabe , Wataru Kitamura , Haruhiko Mitsuda
IPC: G03G15/00
CPC classification number: G03G5/144 , G03G5/0517 , G03G5/14 , G03G5/142 , G03G15/0216 , G03G2215/00957 , G03G2215/025
Abstract: The present invention provides an electrophotographic apparatus in which the deterioration of electrical properties in repetitive use is suppressed even in the case where an electrophotographic photosensitive member absorbs moisture under a high-temperature and high-humidity environment. An undercoat layer of the electrophotographic photosensitive member provided in the electrophotographic apparatus contains (α) a metal oxide particle, (β) a particular benzophenone compound and (γ) a compound represented by the following formula (2). wherein R11 to R15 each independently represent a hydrogen atom, a hydroxy group, a halogen atom, an alkyl group, an alkoxy group or an amino group and A1 represents an alkenyl group having 2 or more and 4 or less carbon atoms.
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公开(公告)号：US20230259045A1
公开(公告)日：2023-08-17
申请号：US18156611
申请日：2023-01-19
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ryoichi Tokimitsu , Haruhiko Mitsuda , Jun Ohira , Toshiyasu Shirasuna , Ikuyo Kuroiwa , Tsuyoshi Shimada , Takanori Ueno , Kenichi Ikari , Eileen Takeuchi
CPC classification number: G03G5/071 , G03G5/14791 , G03G5/14726 , G03G5/0564
Abstract: Provided is an electrophotographic photosensitive member including a surface layer, which is excellent in dispersibility of fluorine atom-containing resin particles and is suppressed from causing a ghost image. Specifically, provided is an electrophotographic photosensitive member including a surface layer, wherein the surface layer contains a fluorine atom-containing resin particle, a binder material, and a polymer A having specific structural units.
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4.发明授权公开(公告)号：US10921723B2
公开(公告)日：2021-02-16
申请号：US16597152
申请日：2019-10-09
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kumiko Takizawa , Tsuyoshi Shimada , Takanori Ueno , Ikuyo Kuroiwa , Haruhiko Mitsuda , Kan Tanabe , Tatsuya Ikezue
Abstract: Provided is an electrophotographic photosensitive member that can achieve both of abrasion resistance and the suppression of a ghost. The electrophotographic photosensitive member includes: a support; an undercoat layer; a charge-generating layer; and a charge-transporting layer, the undercoat layer, the charge-generating layer, and the charge-transporting layer being arranged in the stated order on the support, wherein the charge-transporting layer includes a charge-transporting substance, and a polymer containing a structure represented by the following general formula (1) and a structure represented by the following general formula (2), wherein the charge-generating layer includes a phthalocyanine crystal and a binder resin, and wherein the undercoat layer includes strontium titanate particles and a binder resin.
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5.发明授权公开(公告)号：US10241429B2
公开(公告)日：2019-03-26
申请号：US15960916
申请日：2018-04-24
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuyoshi Shimada , Kumiko Takizawa , Eileen Takeuchi , Ikuyo Kuroiwa , Wataru Kitamura , Kan Tanabe , Haruhiko Mitsuda
Abstract: There is provided an electrophotographic photosensitive member, a process cartridge and an electrophotographic apparatus that are excellent in charging properties and can suppress residual potential in the case where a strontium titanate particle is used as a metal oxide particle in an undercoat layer of the electrophotographic photosensitive member. An electrophotographic photosensitive member in which an undercoat layer contains a strontium titanate particle having a maximum peak at a position of 2θ=32.20±0.20 (θ represents a Bragg angle) in a CuKα characteristic X-ray diffraction pattern, the maximum peak having a half-value width of 0.10 deg or more and 0.50 deg or less, and a process cartridge and an electrophotographic apparatus each provided with the electrophotographic photosensitive member.
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Patent Agency Ranking
公开(公告)号：US20220404725A1
公开(公告)日：2022-12-22
申请号：US17834317
申请日：2022-06-07
Applicant: CANON KABUSHIKI KAISHA
Inventor： Haruhiko Mitsuda , Ryoichi Tokimitsu , Takeshi Hashimoto
Abstract: An image forming method includes a charging step, an image exposure step, a developing step, a transferring step, a cleaning step, and a fixing step. A toner contains toner particles, the toner particles contain a resin A including a unit A1 including an alkyl group having 18 to 36 carbon atoms in the side chain, and the electrophotographic photoreceptor includes a surface layer containing (i) fluorine-containing resin particles and (ii) a fluorine-based polymer B.
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7.发明授权公开(公告)号：US10935898B2
公开(公告)日：2021-03-02
申请号：US16655494
申请日：2019-10-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Ikuyo Kuroiwa , Kumiko Takizawa , Tsuyoshi Shimada , Kan Tanabe , Haruhiko Mitsuda , Takanori Ueno , Tatsuya Ikezue , Wataru Kitamura
Abstract: An electrophotographic photosensitive member includes a support, an undercoat layer, a photosensitive layer, and a surface layer, the undercoat layer containing a binder resin and strontium titanate particles, the surface layer being a cured film of a composition containing at least one compound selected from a guanamine compound and a melamine compound, and a charge transport material having at least one substituent selected from —OH, —OCH3, —NH2, —SH, and —COOH.
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公开(公告)号：US10908521B2
公开(公告)日：2021-02-02
申请号：US16660611
申请日：2019-10-22
Applicant: CANON KABUSHIKI KAISHA
Inventor： Haruhiko Mitsuda , Tatsuya Ikezue , Kumiko Takizawa , Kan Tanabe , Ikuyo Kuroiwa , Takanori Ueno , Tsuyoshi Shimada
Abstract: An electrophotographic photoconductor includes, in sequence, a support member; an undercoating layer containing a binder resin and an inorganic particle; and a photosensitive layer, wherein the binder resin of the undercoating layer is an alkyd-melamine resin, and the inorganic particle of the undercoating layer contains a strontium titanate particle.
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公开(公告)号：US10732525B2
公开(公告)日：2020-08-04
申请号：US16387422
申请日：2019-04-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuyoshi Shimada , Kan Tanabe , Haruhiko Mitsuda
Abstract: An electrophotographic apparatus includes an electrophotographic photosensitive member, a charging roller disposed so as to come into contact with the electrophotographic photosensitive member, and a charging device operable to apply only a DC voltage to charge the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a support member, an undercoat layer over the support member, and a photosensitive layer over the undercoat layer and having a plurality of discrete recesses in the surface thereof. The undercoat layer contains zinc oxide particles and a binder resin. The undercoat layer has cavities therein, and the cavities account for 5.00% or less of the volume of the undercoat layer.
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公开(公告)号：US20190332022A1
公开(公告)日：2019-10-31
申请号：US16387422
申请日：2019-04-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tsuyoshi Shimada , Kan Tanabe , Haruhiko Mitsuda
Abstract: An electrophotographic apparatus includes an electrophotographic photosensitive member, a charging roller disposed so as to come into contact with the electrophotographic photosensitive member, and a charging device operable to apply only a DC voltage to charge the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a support member, an undercoat layer over the support member, and a photosensitive layer over the undercoat layer and having a plurality of discrete recesses in the surface thereof. The undercoat layer contains zinc oxide particles and a binder resin. The undercoat layer has cavities therein, and the cavities account for 5.00% or less of the volume of the undercoat layer.
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