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1 US10466604B2
Electrophotographic photoconductor, image forming apparatus, and process cartridge
Publication/Patent Number: US10466604B2 Publication Date: 2019-11-05 Application Number: 16/025,351 Filing Date: 2018-07-02 Inventor: Toshine, Tetsuya   Hirose, Mitsuaki   Asano, Tomoharu   Assignee: Ricoh Company, Ltd.   IPC: G03G5/14 Abstract: Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat layer contains at least metal oxide particles, a binder, and a salicylic acid derivative such as 4-methylsalicylic acid, wherein the metal oxide particles have a volume resistivity of 1×105 Ω·cm or higher but 1×108 Ω·cm or lower, wherein the undercoat layer has a volume resistivity of 0.001×106 Ω·cm or higher but 0.02×106 Ω·cm or lower, and wherein the undercoat layer has a thickness of 2 micrometers or greater but 20 micrometers or less. Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat ...More ...Less
2 US2019011845A1
ELECTROPHOTOGRAPHIC PHOTOCONDUCTOR, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE
Publication/Patent Number: US2019011845A1 Publication Date: 2019-01-10 Application Number: 16/025,351 Filing Date: 2018-07-02 Inventor: Toshine, Tetsuya   Hirose, Mitsuaki   Asano, Tomoharu   Assignee: TOSHINE, Tetsuya   Hirose, Mitsuaki   Asano, Tomoharu   IPC: G03G5/05 Abstract: Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat layer contains at least metal oxide particles, a binder, and a salicylic acid derivative such as 4-methylsalicylic acid, wherein the metal oxide particles have a volume resistivity of 1×105 Ω·cm or higher but 1×108 Ω·cm or lower, wherein the undercoat layer has a volume resistivity of 0.001×106 Ω·cm or higher but 0.02×106 Ω·cm or lower, and wherein the undercoat layer has a thickness of 2 micrometers or greater but 20 micrometers or less. Provided is an electrophotographic photoconductor including: a conductive support; an undercoat layer; and a photoconductive layer, wherein the undercoat layer and the photoconductive layer are provided over the conductive support in the order of reciting, wherein the undercoat ...More ...Less
3 EP1150183B1
Volume hologram multilayer structure
Publication/Patent Number: EP1150183B1 Publication Date: 2017-03-15 Application Number: 01110096.3 Filing Date: 2001-04-30 Inventor: Toshine, Tetsuya   Ohtaki, Hiroyuki   Ueda, Kenji   Assignee: DAI NIPPON PRINTING CO., LTD.   IPC: G03H1/00 Abstract: The invention provides a hologram transfer foil 1 comprising, in order from top to bottom, a substrate 7, a volume hologram layer 2 releasably stacked on substrate 7 and comprising a volume hologram in a cured resin layer, a first heat seal layer 3 and a second heat seal layer 4. In use, the hologram transfer foil 1 is applied on the second heat seal layer 4 side over an application member. The adhesion force of volume hologram layer 2 to the application member is larger than a material fracture force for the volume hologram layer or the application member, so that the hologram transfer layer can be applied by thermo-compression to the application member. This hologram transfer foil is useful for illegal copying of the hologram layer because when the volume hologram is forcibly peeled from the application, a material fracture of the volume hologram layer or application member occurs. When a colored layer functioning as a back layer is provided, it is possible to obtain a hologram transfer foil which ensure to eliminate any adverse influence of a coloring component on the volume hologram layer. The invention provides a hologram transfer foil 1 comprising, in order from top to bottom, a substrate 7, a volume hologram layer 2 releasably stacked on substrate 7 and comprising a volume hologram in a cured resin layer, a first heat seal layer 3 and a second heat seal layer ...More ...Less
4 EP1022625B1
Hologram transfer film
Publication/Patent Number: EP1022625B1 Publication Date: 2017-06-28 Application Number: 00100238.5 Filing Date: 2000-01-18 Inventor: Shioda, Satoshi Dai Nippon Printing Co.ltd.   Hojo, Mikiko Dai Nippon Printing Co.ltd.   Otaki, Hiroyuki Dai Nippon Printing Co.ltd   Ueda, Kenji Dai Nippon Printing Co.ltd.   Toshine, Tetsuya Dai Nippon Printing Co.ltd.   Assignee: DAI NIPPON PRINTING CO., LTD.   IPC: G03H1/02 Abstract: Disclosed is a hologram transfer film which can realize easy and good transfer of a hologram and, at the same time, can realize stable transfer of the hologram in a transfer process. The hologram transfer film comprises: a substrate film; and a transfer layer provided on the substrate film, the transfer layer comprising a hologram-forming layer and a heat-sensitive adhesive layer provided in that order on the substrate film, the hologram-forming layer having a breaking strain of 0.5 to 15% at 25 DEG C and a breaking strain of 0.5 to 30% at 120 DEG C. Disclosed is a hologram transfer film which can realize easy and good transfer of a hologram and, at the same time, can realize stable transfer of the hologram in a transfer process. The hologram transfer film comprises: a substrate film; and a transfer layer provided on the ...More ...Less
5 EP2309339B1
Relief hologram or diffraction grating sheet and forgery-preventing sheet comprising the same
Publication/Patent Number: EP2309339B1 Publication Date: 2016-11-30 Application Number: 10010585.7 Filing Date: 2000-01-18 Inventor: Shioda, Satoshi   Hojo, Mikiko   Otaki, Hiroyuki   Ueda, Kenji   Toshine, Tetsuya   Assignee: Dai Nippon Printing Co., Ltd.   IPC: B42D15/00 Abstract: A photocurable resin composition for providing a formative layer (4) formed of a hologram or a diffraction grating on a substrate (2) having a Young's modulus at 1% elongation of not less than 2,000 MPa at 25°C and a Young's modulus at 1% elongation of not less than 350 MPa at 120°C, wherein the photocurable resin composition provides a cured product of which the Young's modulus at 1% elongation at 25°C and the Young's modulus at 1% elongation at 120°C are respectively lower than those of the substrate (2). A photocurable resin composition for providing a formative layer (4) formed of a hologram or a diffraction grating on a substrate (2) having a Young's modulus at 1% elongation of not less than 2,000 MPa at 25°C and a Young's modulus at 1% elongation of not less than 350 MPa at ...More ...Less
6 EP2453320B1
Multilayer volume hologram, and label for multilayer volume hologram fabrication
Publication/Patent Number: EP2453320B1 Publication Date: 2016-06-29 Application Number: 11192806.5 Filing Date: 2001-06-27 Inventor: Toshine, Tetsuya   Ohkawa, Hirotada   Ohtaki, Hiroyuki   Ueda, Kenji   Noujima, Fumiko   Assignee: DAI NIPPON PRINTING CO., LTD.   IPC: G03H1/00 Abstract: In the multilayer volume hologram 1 of the invention, the adhesive layer 5, volume hologram 6 and surface protective film 7 are laminated on the application member 2 in this order, and the breaking strength of the hologram layer should be larger than the peel strength between the surface protective film and the volume hologram layer and smaller than the peel strength with which the hologram layer is peeled off the application member and the breaking strength of the surface protective film. This multilayer volume hologram provides a more improved protection for the volume hologram. A portrait replacement or falsification of an information area ensures that the volume hologram layer can break down. Thus, more reliable counterfeit-prooffness is achievable. In the multilayer volume hologram 1 of the invention, the adhesive layer 5, volume hologram 6 and surface protective film 7 are laminated on the application member 2 in this order, and the breaking strength of the hologram layer should be larger than the peel strength between ...More ...Less
7 US9298113B2
Electrophotographic photoconductor, image forming apparatus, and process cartridge
Publication/Patent Number: US9298113B2 Publication Date: 2016-03-29 Application Number: 14/155,716 Filing Date: 2014-01-15 Inventor: Ishida, Toshihiro   Ikuno, Hiroshi   Toshine, Tetsuya   Toda, Naohiro   Iwamoto, Takafumi   Egawa, Kazuhiro   Assignee: Ricoh Company, Ltd.   IPC: G03G15/04 Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 Ω·cm or less. An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and ...More ...Less
8 EP2469341B1
Image bearing member and image forming method, image forming apparatus, and process cartridge
Publication/Patent Number: EP2469341B1 Publication Date: 2016-03-30 Application Number: 11195423.6 Filing Date: 2011-12-22 Inventor: Shimoyama, Keisuke   Ikuno, Hiroshi   Toshine, Tetsuya   Asano, Tomoharu   Kuboshima, Yasuhito   Tanaka, Yuuji   Assignee: Ricoh Company, Ltd.   IPC: G03G5/06 Abstract: An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound represented by Chemical structure I or a second compound represented by Chemical structure II; R1 to R3 independently represent phenyl groups, biphenly groups, and condensed polycyclic hydrocarbon groups, all of which may have a substitution group selected from the group consisting of an alkyl group having one to four carbon atoms, an alkoxy group having one to four carbon atoms, and a halogen atom, and at least one of R1 to R3 is the condensed polycyclic hydrocarbon group; and R3, R4, R8, R9, R13, and R14 independently represent hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, or aryl groups excluding a case in which all are hydrogen atoms, and R1, R2, R5, R6, R7, R10, R11 R12, and R15 independently represent hydrogen atoms, halogen atoms, substituted or non-substituted alkyl groups, substituted or non-substituted alkoxy groups, substituted or non-substituted aralkyl groups, substituted or non-substituted aryl groups, substituted or non-substituted alkylene groups, cyano groups, nitro groups, or -OCO=CH 2 R16, in which R16 represents a hydrogen atom, a substituted or non-substituted alkyl group, a substituted or non-substituted alkoxy group, or a substituted or non-substituted aryl group. An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound represented by Chemical ...More ...Less
9 EP1168110B1
Hologram transfer foil
Publication/Patent Number: EP1168110B1 Publication Date: 2016-04-20 Application Number: 01114769.1 Filing Date: 2001-06-25 Inventor: Toshine, Tetsuya C/o Dai Nippon Printing Co.ltd.   Ohtaki, Hiroyuki C/o Dai Nippon Printing Co.ltd.   Ueda, Kenji C/o Dai Nippon Printing Co.ltd.   Assignee: DAI NIPPON PRINTING CO., LTD.   IPC: G03H1/02 Abstract: The invention provides a hologram transfer foil comprising a substrate and a transfer layer laminated thereon, said transfer layer comprising a surface protective layer, a thermoplastic resin layer, a hologram layer and a heat seal layer in this order. The hologram transfer foil is applied on the heat seal layer side to an application member. In this case, a peel force between the substrate and the surface protective layer is smaller than that between adjacent layers in other layers. This hologram transfer foil enables a hologram image, etc. to be reconstructed in an uninterrupted manner, and is improved in terms of transferability and productivity. The invention provides a hologram transfer foil comprising a substrate and a transfer layer laminated thereon, said transfer layer comprising a surface protective layer, a thermoplastic resin layer, a hologram layer and a heat seal layer in this order. The hologram transfer foil ...More ...Less
10 US9037067B2
Image forming apparatus and process cartridge
Publication/Patent Number: US9037067B2 Publication Date: 2015-05-19 Application Number: 13/752,754 Filing Date: 2013-01-29 Inventor: Ikuno, Hiroshi   Sakon, Yohta   Ohmori, Masahiro   Egawa, Kazuhiro   Toshine, Tetsuya   Assignee: RICOH COMPANY, LTD.   IPC: G03G21/00 Abstract: An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the edge line of the cleaning blade includes a substrate of the elastic blade; a mixed layer having a thickness not less than 1.0 μm, formed of the substrate and at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer having a thickness not less than 0.1 μm, formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate. An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the ...More ...Less
11 US9170558B2
Image forming apparatus and process cartridge including a cleaning blade which includes a cured composition
Publication/Patent Number: US9170558B2 Publication Date: 2015-10-27 Application Number: 14/471,484 Filing Date: 2014-08-28 Inventor: Ikuno, Hiroshi   Toshine, Tetsuya   Gondoh, Masanobu   Nohsho, Shinji   Gohda, Shohei   Toyama, Kaori   Assignee: Ricoh Company, Ltd.   IPC: G03G21/16 Abstract: An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on the electrically conductive support, and a surface layer containing a binder resin and particles formed on a surface of the photoconductive layer, or contains the electrically conductive support, and the photoconductive layer formed on the electrically conductive support, wherein the cleaning unit contains a cleaning blade, which contains a cured composition containing a curing agent in a region of the cleaning blade, which is to be in contact with the image bearing member, and wherein the curing agent contains a polycyclic aliphatic hydrocarbon group, and a (meth)acryloyloxy group. An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on ...More ...Less
12 US9122183B2
Electrophotographic photoreceptor, image forming apparatus and process cartridge
Publication/Patent Number: US9122183B2 Publication Date: 2015-09-01 Application Number: 13/785,242 Filing Date: 2013-03-05 Inventor: Toshine, Tetsuya   Ikuno, Hiroshi   Toda, Naohiro   Iwamoto, Takafumi   Egawa, Kazuhiro   Ishida, Toshihiro   Assignee: Ricoh Company, Ltd.   IPC: G03G5/14 Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 Ω/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000. An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; ...More ...Less
13 US2015071678A1
IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
Publication/Patent Number: US2015071678A1 Publication Date: 2015-03-12 Application Number: 14/471,484 Filing Date: 2014-08-28 Inventor: Ikuno, Hiroshi   Toshine, Tetsuya   Gondoh, Masanobu   Nohsho, Shinji   Gohda, Shohei   Toyama, Kaori   Assignee: IKUNO, Hiroshi   Toshine, Tetsuya   Gondoh, Masanobu   Nohsho, Shinji   Gohda, Shohei   Toyama, Kaori   IPC: G03G15/00 Abstract: An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on the electrically conductive support, and a surface layer containing a binder resin and particles formed on a surface of the photoconductive layer, or contains the electrically conductive support, and the photoconductive layer formed on the electrically conductive support, wherein the cleaning unit contains a cleaning blade, which contains a cured composition containing a curing agent in a region of the cleaning blade, which is to be in contact with the image bearing member, and wherein the curing agent contains a polycyclic aliphatic hydrocarbon group, and a (meth)acryloyloxy group. An image forming apparatus, which contains: an image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a cleaning unit, wherein the image bearing member contains an electrically conductive support, a photoconductive layer formed on ...More ...Less
14 US2014199620A1
ELECTROPHOTOGRAPHIC PHOTOCONDUCTOR, IMAGE FORMING APPARATUS, AND PROCESS CARTRIDGE
Publication/Patent Number: US2014199620A1 Publication Date: 2014-07-17 Application Number: 14/155,716 Filing Date: 2014-01-15 Inventor: Ishida, Toshihiro   Ikuno, Hiroshi   Toshine, Tetsuya   Toda, Naohiro   Iwamoto, Takafumi   Egawa, Kazuhiro   Assignee: ISHIDA, Toshihiro   IKUNO, Hiroshi   TOSHINE, Tetsuya   TODA, Naohiro   IWAMOTO, Takafumi   EGAWA, Kazuhiro   IPC: G03G5/06 Abstract: An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and first inorganic fine particles, and wherein the first inorganic fine particles are inorganic fine particles having surfaces modified with at least one of a primary amino group and a secondary amino group, and a volume resistivity of the first inorganic fine particles is 1×108 Ω·cm or less. An electrophotographic photoconductor, including: an electroconductive substrate; and at least a photoconductive layer and a surface layer in this order over the electroconductive substrate, wherein the surface layer includes a resin having no charge transport properties, and ...More ...Less
15 US8867960B2
Image forming apparatus and process cartridge
Publication/Patent Number: US8867960B2 Publication Date: 2014-10-21 Application Number: 13/783,645 Filing Date: 2013-03-04 Inventor: Toda, Naohiro   Iwamoto, Takafumi   Ishida, Toshihiro   Toshine, Tetsuya   Sakon, Yohta   Ohmori, Masahiro   Assignee: Ricoh Company, Ltd.   IPC: G03G15/00 Abstract: An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion to remove toner from the surface layer A in motion while the front edge portion is in contact with the surface layer A, the front edge portion having a laminate structure formed of a substrate of the elastic blade, a mixed layer of the substrate and an acrylic and/or methacrylic resin, the mixed layer having a thickness of 1.0 μm or greater, and a surface layer B having an acrylic and/or methacrylic resin, the surface layer B having a thickness of 0.1 μm or greater. An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion ...More ...Less
16 US8652717B2
Image bearing member and image forming method, image forming apparatus, and process cartridge using the same
Publication/Patent Number: US8652717B2 Publication Date: 2014-02-18 Application Number: 13/329,525 Filing Date: 2011-12-19 Inventor: Shimoyama, Keisuke   Ikuno, Hiroshi   Toshine, Tetsuya   Asano, Tomoharu   Kuboshima, Yasuhito   Tanaka, Yuuji   Assignee: Ricoh Company, Ltd.   IPC: G03G15/04 Abstract: An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound consisting essentially of a nitrogen atom and a phenyl group, biphenyl group, and condensed polycyclic hydrocarbon group, or a second compound consisting essentially of a nitrogen atom and hydrogen atoms, halogen atoms, alkyl groups, alkoxy groups, or aryl groups, substituted or non-substituted alkyl groups, substituted or non-substituted alkoxy groups, substituted or non-substituted aralkyl groups, substituted or non-substituted aryl group, substituted or non-substituted alkylene groups, cyano groups, nitro groups, or —OCO═CH2R16, in which R16 represents a hydrogen atom, a substituted or non-substituted alkyl group, a substituted or non-substituted alkoxy group, or a substituted or non-substituted aryl group. An image bearing member having an electroconductive substrate, a photosensitive layer overlying the electroconductive layer, and a cross-linked surface layer overlying the photosensitive layer, which contains a cross-linked polymer and a first compound consisting essentially of ...More ...Less
17 US2014064810A1
IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
Publication/Patent Number: US2014064810A1 Publication Date: 2014-03-06 Application Number: 13/953,949 Filing Date: 2013-07-30 Inventor: Iwamoto, Takafumi   Ikuno, Hiroshi   Toshine, Tetsuya   Egawa, Kazuhiro   Ishida, Toshihiro   Sakon, Yohta   Ohmori, Masahiro   Toda, Naohiro   Assignee: Iwamoto, Takafumi   Ikuno, Hiroshi   Toshine, Tetsuya   Egawa, Kazuhiro   Ishida, Toshihiro   Sakon, Yohta   Ohmori, Masahiro   Toda, Naohiro   IPC: G03G21/00 Abstract: An image forming apparatus includes an electrophotographic photoreceptor; and a cleaning blade. The electrophotographic photoreceptor includes an outermost layer having a ten-point average roughness Rz of from 0.5 to 2.4 μm and an average interval between concavities and convexities Sm of from 30 to 300 μm, and the cleaning blade includes a reed-shaped elastic blade having a contact point to the electrophotographic photoreceptor. The contact point includes a substrate; a mixed layer overlying the substrate, including a material forming the substrate and at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 1.0 μm; and a surface layer overlying the mixed layer, including at least one of an acrylic resin and a methacrylic resin and having a thickness not less than 0.1 μm. An image forming apparatus includes an electrophotographic photoreceptor; and a cleaning blade. The electrophotographic photoreceptor includes an outermost layer having a ten-point average roughness Rz of from 0.5 to 2.4 μm and an average interval between concavities and ...More ...Less
18 US2013243506A1
IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
Publication/Patent Number: US2013243506A1 Publication Date: 2013-09-19 Application Number: 13/752,754 Filing Date: 2013-01-29 Inventor: Ikuno, Hiroshi   Sakon, Yohta   Ohmori, Masahiro   Egawa, Kazuhiro   Toshine, Tetsuya   Assignee: RICOH COMPANY, LTD.   IPC: G03G21/00 Abstract: An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the edge line of the cleaning blade includes a substrate of the elastic blade; a mixed layer having a thickness not less than 1.0 μm, formed of the substrate and at least one of an acrylic resin and a methacrylic resin, located at the surface of the substrate; and a surface layer having a thickness not less than 0.1 μm, formed of at least one of an acrylic resin and a methacrylic resin, located on the surface of the substrate. An image forming apparatus including at least a photoreceptor; and a cleaning blade formed of a strip-shaped elastic blade to contact an edge line to the surface of the photoreceptor, wherein the photoreceptor includes a surface layer comprising a particulate material, and the ...More ...Less
19 US2013243484A1
IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
Publication/Patent Number: US2013243484A1 Publication Date: 2013-09-19 Application Number: 13/783,645 Filing Date: 2013-03-04 Inventor: Toda, Naohiro   Iwamoto, Takafumi   Ishida, Toshihiro   Toshine, Tetsuya   Sakon, Yohta   Ohmori, Masahiro   Assignee: RICOH COMPANY, LTD.   IPC: G03G15/00 Abstract: An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion to remove toner from the surface layer A in motion while the front edge portion is in contact with the surface layer A, the front edge portion having a laminate structure formed of a substrate of the elastic blade, a mixed layer of the substrate and an acrylic and/or methacrylic resin, the mixed layer having a thickness of 1.0 μm or greater, and a surface layer B having an acrylic and/or methacrylic resin, the surface layer B having a thickness of 0.1 μm or greater. An image forming apparatus including an image bearing member having a surface layer A having a surface hardness of 200 N/mm2 or greater, the surface layer A containing fillers made of a metal oxide and a cleaning blade having a reed-like elastic blade having a front edge portion ...More ...Less
20 US2013244150A1
ELECTROPHOTOGRAPHIC PHOTORECEPTOR, IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
Publication/Patent Number: US2013244150A1 Publication Date: 2013-09-19 Application Number: 13/785,242 Filing Date: 2013-03-05 Inventor: Toshine, Tetsuya   Ikuno, Hiroshi   Toda, Naohiro   Iwamoto, Takafumi   Egawa, Kazuhiro   Ishida, Toshihiro   Assignee: Toshine, Tetsuya   Ikuno, Hiroshi   Toda, Naohiro   Iwamoto, Takafumi   Egawa, Kazuhiro   Ishida, Toshihiro   IPC: G03G15/00 Abstract: An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; and an inorganic particulate material, wherein the inorganic particulate material is a zinc oxide doped with a boron group, and wherein the electrophotographic photoreceptor has a surface specific resistivity (R1) not less than 1013 Ω/cm2 when the surface layer has an electric field intensity of 1×104 V/cm, and a ratio (R1/R15) of the surface specific resistivity (R1) to a surface specific resistivity (R15) when the surface layer has an electric field intensity of 1.5×105 V/cm of from 100 to 5,000. An electrophotographic photoreceptor, including an electroconductive substrate; a photosensitive layer overlying the electroconductive substrate; and a surface layer overlying the photosensitive layer, wherein the surface layer includes a resin having no charge transportability; ...More ...Less