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51.发明申请公开(公告)号：US20140004452A1
公开(公告)日：2014-01-02
申请号：US13930341
申请日：2013-06-28
发明人： Michiyo Sekiya , Kunihiko Sekido , Atsushi Okuda , Hiroyuki Tomono , Nobuhiro Nakamura , Yota Ito , Kenichi Kaku , Yuka Ishiduka
CPC分类号： G03G5/047 , G03G5/0542 , G03G5/0546 , G03G5/055 , G03G5/0575 , G03G5/0589 , G03G5/0592 , G03G5/0605 , G03G5/0607 , G03G5/0648 , G03G5/065 , G03G5/0651 , G03G5/0657 , G03G5/075 , G03G5/076 , G03G5/142 , G03G15/00 , G03G15/751
摘要： An electrophotographic photosensitive member has a laminated body and a hole transporting layer formed on the laminated body, wherein the laminated body has a support, an electron transporting layer and a charge generating layer in this order, and satisfies the following expressions (2) and (4): |Vl2−Vl1|≦0.35 (2) 0.10≦|(Vd2−Vl3)/Vd2|≦0.20 (4).
摘要翻译： 电子照相感光构件具有层叠体和形成在层叠体上的空穴传输层，其中层叠体依次具有支撑体，电子传输层和电荷产生层，并且满足以下表达式（2）和（ 4）：| Vl2-Vl1|@0.35（2）0.10 @ |（Vd2-V13）/Vd2|@0.20（4）。
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公开(公告)号：US12045006B2
公开(公告)日：2024-07-23
申请号：US17230550
申请日：2021-04-14
发明人： Shuhei Iwasaki , Tomohito Ishida , Nobuhiro Nakamura , Hiroyuki Watanabe , Tatsuya Yamaai , Yuka Ishiduka , Yota Ito , Takeshi Murakami
CPC分类号： G03G5/047 , G03G15/75 , G03G21/1814
摘要： There is provided an electrophotographic photosensitive member having drum shape, the electrophotographic photosensitive member including a support and a photosensitive layer, wherein an outer surface of the electrophotographic photosensitive member has wrinkles, and when an observation region having square form with one side of 100 μm is placed at an arbitrary position on the outer surface, a line that passes through a central point of the observation region and is parallel to a circumferential direction of the electrophotographic photosensitive member is defined as a first reference line L1, and 3,599 reference lines obtained by rotating the first reference line L1 at every 0.1° around the central point are defined as L2 to L3,600, respectively, each of L1 to L3,600 intersects with convex portions of the wrinkles at a plurality of locations and has at least two different intersection angles selected from the plurality of locations.
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53.发明授权公开(公告)号：US11150566B2
公开(公告)日：2021-10-19
申请号：US16891525
申请日：2020-06-03
发明人： Shuhei Iwasaki , Akira Sakakibara , Jumpei Kuno , Yota Ito , Kohei Makisumi
摘要： The present disclosure provides an electrophotographic photosensitive member that can simultaneously achieve the suppression of the occurrence of the black spot in a charged portion and the suppression of the deterioration in sensitivity of an exposed portion, even after stored in a high-temperature and high-humidity environment. An electrophotographic photosensitive member includes an electro-conductive support, an undercoat layer, a charge generation layer and a charge transport layer in this order, wherein an atomic concentration ratio R of the oxygen atom to the aluminum atom on the surface of the electro-conductive support, as measured by energy dispersive X-ray spectroscopy, satisfies the following Expression (1): 1.6≤R (1) and the undercoat layer includes a titanium oxide particle that is surface-treated with a particular silane compound.
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公开(公告)号：US11086241B2
公开(公告)日：2021-08-10
申请号：US16788134
申请日：2020-02-11
发明人： Jumpei Kuno , Akira Sakakibara , Yota Ito , Shuhei Iwasaki , Kohei Makisumi
摘要： An electrophotographic photoreceptor includes a support, an undercoat layer placed on the support, a charge generation layer placed on the undercoat layer, and a charge transport layer placed on the charge generation layer. The undercoat layer contains titanium oxide particles surface-treated with an organosilicon compound that is at least one member selected from the group consisting of compounds represented by formulas (1) to (8) and a polyamide resin. The charge generation layer contains hydroxygallium phthalocyanine.
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55.发明授权公开(公告)号：US10942462B2
公开(公告)日：2021-03-09
申请号：US16668896
申请日：2019-10-30
发明人： Yota Ito , Akira Sakakibara , Jumpei Kuno , Shuhei Iwasaki , Kohei Makisumi
摘要： The present disclosure provides an electrophotographic photosensitive member that reduces the accumulation of charge and the leakage which are caused by a repeated use in a long period of time. The electrophotographic photosensitive member has a support, an undercoat layer, a charge generation layer and a charge transport layer in this order, wherein the undercoat layer contains a polyamide resin, and a titanium oxide particle, wherein the titanium oxide particle has been surfacetreated with an organosilicon compound, wherein the undercoat layer satisfies 10≤α≤70, where α represents a degree [%] of hydrophobicity of the titanium oxide particle which has been surfacetreated with the organosilicon compound; and the undercoat layer satisfies 0.015≤(β×γ)≤0.040, where β represents an average primary particle size [μm] of the titanium oxide particles, and γ represents a weight percentage [wt %] of an Si element of the organosilicon compound with respect to the titanium oxide particle.
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56.发明授权公开(公告)号：US10831117B2
公开(公告)日：2020-11-10
申请号：US16686645
申请日：2019-11-18
发明人： Akira Sakakibara , Yota Ito , Jumpei Kuno , Shuhei Iwasaki , Kohei Makisumi
IPC分类号： G03G5/14
摘要： Provided is an electrophotographic photosensitive member that is improved in potential stability in long-term use under a high-temperature and high-humidity environment, and does not cause degradation in image quality, such as a low density. The electrophotographic photosensitive member includes: a support; an undercoat layer formed on the support; a charge-generating layer formed directly on the undercoat layer; and a charge-transporting layer formed on the charge-generating layer. The undercoat layer contains a polyamide resin, titanium oxide particles surface-treated with an organic silicon compound, and a compound represented by the following Formula (1), and has a content of the compound represented by the Formula (1) of 4 ppm or more and 80 ppm or less: in the Formula (1), R and R′ each independently represent a methyl group or an ethyl group.
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57.发明申请公开(公告)号：US20200174385A1
公开(公告)日：2020-06-04
申请号：US16686645
申请日：2019-11-18
发明人： Akira Sakakibara , Yota Ito , Jumpei Kuno , Shuhei Iwasaki , Kohei Makisumi
摘要： Provided is an electrophotographic photosensitive member that is improved in potential stability in long-term use under a high-temperature and high-humidity environment, and does not cause degradation in image quality, such as a low density. The electrophotographic photosensitive member includes: a support; an undercoat layer formed on the support; a charge-generating layer formed directly on the undercoat layer; and a charge-transporting layer formed on the charge-generating layer. The undercoat layer contains a polyamide resin, titanium oxide particles surface-treated with an organic silicon compound, and a compound represented by the following Formula (1), and has a content of the compound represented by the Formula (1) of 4 ppm or more and 80 ppm or less: in the Formula (1), R and R′ each independently represent a methyl group or an ethyl group.
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58.发明授权公开(公告)号：US10416581B2
公开(公告)日：2019-09-17
申请号：US15667715
申请日：2017-08-03
发明人： Yota Ito , Tsutomu Nishida , Shoma Hinata , Tatsuya Yamaai , Akira Sakakibara , Daisuke Miura
摘要： 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.
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59.发明申请公开(公告)号：US20190121251A1
公开(公告)日：2019-04-25
申请号：US16230617
申请日：2018-12-21
发明人： Tsutomu Nishida , Akira Sakakibara , Daisuke Miura , Yota Ito , Shoma Hinata , Tatsuya Yamaai , Nobuo Kosaka
摘要： 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.
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60.发明申请公开(公告)号：US20180031985A1
公开(公告)日：2018-02-01
申请号：US15663421
申请日：2017-07-28
发明人： Tsutomu Nishida , Akira Sakakibara , Daisuke Miura , Yota Ito , Shoma Hinata , Tatsuya Yamaai , Nobuo Kosaka
CPC分类号： G03G5/0564 , G03G5/0582 , G03G15/75
摘要： 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.
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