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1.发明公开公开(公告)号：US20240345495A1
公开(公告)日：2024-10-17
申请号：US18609415
申请日：2024-03-19
发明人： MICHIYO SEKIYA , AKIHIRO MARUYAMA , MASASHI NISHI , NANAMI KATO
CPC分类号： G03G5/047 , G03G5/0525 , G03G5/076 , G03G21/1814
摘要： Provided is an electrophotographic photosensitive member including in this order: a support; an electron-transporting layer; a charge-generating layer; and a hole-transporting layer, wherein the electron-transporting layer comprises a polymer having a specific structural unit, and wherein the polymer has a glass transition temperature Tg of −10 to 50° C.
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2.发明公开公开(公告)号：US20240118634A1
公开(公告)日：2024-04-11
申请号：US18524566
申请日：2023-11-30
发明人： SHUNTARO WATANABE , TOMOHITO ISHIDA , NOBUHIRO NAKAMURA , HIROYUKI WATANABE , TATSUYA YAMAAI , MASATADA HIROTA
CPC分类号： G03G5/047 , G03G5/14747 , G03G21/1839 , G03G2221/183
摘要： The electrophotographic photosensitive member includes a support and a photosensitive layer on the support, in which a surface layer of the electrophotographic photosensitive member contains a particle, the surface layer has a particle partially exposed from the surface layer among the particle contained in the surface layer, the particle has a volume average particle diameter of 50.0 nm or more and 350.0 nm or less; in a cross-section of the surface layer, the number of the particle partially exposed from the surface layer is 80% by number or more based on a total number of the particle contained in the surface layer; and a total volume of an exposed portion of the particle partially exposed from the surface layer is 30% by volume or more and 80% by volume or less based on an entire volume of the particle contained in the surface layer.
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3.发明公开公开(公告)号：US20230168596A1
公开(公告)日：2023-06-01
申请号：US18059015
申请日：2022-11-28
发明人： Yuichi YOSHIDA , Kiichiro OJI
CPC分类号： G03G5/0696 , G03G5/047 , G03G21/1814
摘要： An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a phthalocyanine pigment and a first resin. A ratio of the mass of the phthalocyanine pigment to the mass of the first resin is greater than 2.0 and less than 3.5. A ratio A830/A783 of a second absorbance A830 to a first absorbance A783 of the charge generating layer is at least 0.97 and no greater than 1.10. The first absorbance A783 is an absorbance of the charge generating layer with respect to first light with a wavelength of 783 nm. The second absorbance A830 is an absorbance of the charge generating layer with respect to second light with a wavelength of 830 nm.
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4.发明授权公开(公告)号：US11599034B2
公开(公告)日：2023-03-07
申请号：US17150603
申请日：2021-01-15
摘要： An electrophotographic photosensitive member that has an electroconductive support and a photosensitive layer on the electroconductive support, and reduces image failures. The surface layer of the electrophotographic photosensitive member includes a cured product of a composition of: a charge transporting compound having a specific polymerizable functional group; a polytetrafluoroethylene particle having a specific primary particle diameter; and a polymer having specific structural units and having weight average molecular weight.
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公开(公告)号：US20230059041A1
公开(公告)日：2023-02-23
申请号：US17816024
申请日：2022-07-29
发明人： Kenichi Kaku , Akihiro Maruyama , Shuhei Iwasaki , Tatsuya Yamaai , Kaname Watariguchi , Michiyo Sekiya , Kohei Makisumi , Hideharu Shimozawa
摘要： Provided is an electrophotographic apparatus which uses a light emitting diode array as an exposure unit and exposes a photosensitive member to a quantity of light from the LED array whose average light quantity satisfies 0.8×Emin or more and 1.1×Emin or less on condition that a normalized radius of curvature R of a normalized graph derived from the E-V curve of the photosensitive member has a minimum value of 0.24 or less, and a light quantity at the minimum value of the normalized radius of curvature R is Emin [μJ/cm2]. This electrophotographic apparatus prevents both the occurrence of image unevenness due to light quantity variation among the elements of the LED array and the generation of ghost images due to a rest potential.
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6.发明申请公开(公告)号：US20220100110A1
公开(公告)日：2022-03-31
申请号：US17481401
申请日：2021-09-22
发明人： Yuko IWASHITA , Kazunari HAMASAKI
摘要： An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer, and contains a charge generating material, an electron transport material, a binder resin, and a hole transport material. The electron transport material includes a compound represented by general formula (1). The binder resin includes a polycarbonate resin having an end group and a main chain represented by general formula (10).
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公开(公告)号：US11249406B2
公开(公告)日：2022-02-15
申请号：US16877795
申请日：2020-05-19
摘要： Shaping a photoconductive drum includes preparing a dispersion having a charge generation composition and dipping an elongated support element into the dispersion. Withdrawing from the dispersion portions of the support element at different speeds results in different thicknesses of charge generation composition on the support element. Faster withdrawal results in thicker charge generation composition than does slower withdrawal. Portions with thicker composition provide denser optical densities compared to thinner composition allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. Coating the support element with a charge transport layer occurs next, then curing. Oxidation of the support element may occur prior to application of the charge generation composition. A protective overcoat may also exist over the charge transport layer.
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公开(公告)号：US20220026820A1
公开(公告)日：2022-01-27
申请号：US17498346
申请日：2021-10-11
摘要： A photoconductive drum includes an elongated support element with a shaped charge generation layer. The layer extends from the support element at a single thickness along about two-thirds of a length thereof. Thicker charge generation portions provides denser optical densities compared to thinner portions allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. A charge transport layer overcoats the charge generation layer. Optionally, an oxidation layer underlies the charge generation layer as does a protective overcoat overlying the charge transport layer.
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公开(公告)号：US20210405548A1
公开(公告)日：2021-12-30
申请号：US17338895
申请日：2021-06-04
摘要： An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, in which a volume resistivity of the photoconductive layer after wear is 5.0×1010 Ω·cm or more and 2.0×1011 Ω·cm or less when a ratio of a thickness of the photoconductive layer after wear to a thickness of the photoconductive layer before wear (the thickness of the photoconductive layer after wear/the thickness of the photoconductive layer before wear) is 0.8.
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10.发明申请公开(公告)号：US20210364937A1
公开(公告)日：2021-11-25
申请号：US17315851
申请日：2021-05-10
发明人： Jumpei Kuno , Taichi Sato
摘要： The present disclosure provides an electrophotographic photosensitive member that can obtain a satisfactory image free from the image defect such as the interference fringes as an electrophotographic photosensitive member, and can achieve high fineness in an output image. The electrophotographic photosensitive member includes a support, an electroconductive layer and a photosensitive layer, in this order, wherein the electroconductive layer comprises a binder resin, a metal oxide particle and a silica particle, a content of the metal oxide particle in the electroconductive layer is 20.0 to 60.0% by volume with respect to total volume of the electroconductive layer, the metal oxide particle has an average primary particle diameter of 50 to 500 nm, and the silica particle has an average primary particle diameter of 10 to 300 nm.
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