Patents by Inventor Noriko Nagamine
Noriko Nagamine has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9372428Abstract: Provided is a charging member having a rough surface, thereby suppressing adhesion of dirt on the surface. A charging member having a supporting member, an elastic layer and a surface layer, in which the surface layer contains a polymer compound, which has a Si—O-M bond and at least one structural unit selected from structural units represented by the following general formula (1) and the following general formula (2), and has a structural unit represented by the following general formula (3); the charging member has cracks developing from the surface thereof and reaching the elastic layer; and the cracks each have convexly raised edges, by which the surface thereof is roughened.Type: GrantFiled: January 6, 2012Date of Patent: June 21, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Noriaki Kuroda, Noriko Nagamine, Yuya Tomomizu
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Patent number: 8870728Abstract: Provided are a charging member capable of maintaining excellent wear resistance even after repeated use, and a process cartridge and an electrophotographic apparatus each having the charging member. The charging member is characterized in that its surface layer has a polysiloxane to which a silsesquioxane is bonded.Type: GrantFiled: April 5, 2011Date of Patent: October 28, 2014Assignee: Canon Kabushiki KaishaInventors: Yoko Kuruma, Noriaki Kuroda, Noriko Nagamine
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Patent number: 8755714Abstract: A charging member is provided with a surface layer that can not easily wear even due to its contact with a photosensitive member and also has an appropriate elasticity contributing to the formation of an appropriate nip between it and the photosensitive member.Type: GrantFiled: February 8, 2012Date of Patent: June 17, 2014Assignee: Canon Kabushiki KaishaInventors: Noriko Nagamine, Noriaki Kuroda, Yuya Tomomizu
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Patent number: 8523748Abstract: A charging member is provided which has a surface layer that can more surely keep bleeding from occurring. It is a charging member having a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having a constituent unit represented by the following formula (1) and a constituent unit represented by the following formula (2), and having an Si—O—Zr linkage.Type: GrantFiled: December 12, 2011Date of Patent: September 3, 2013Assignee: Canon Kabushiki KaishaInventors: Noriko Nagamine, Noriaki Kuroda
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Patent number: 8501325Abstract: Provided is a charging member provided with a surface layer capable of suppressing the bleeding of a low-molecular weight component from an elastic layer with improved reliability. The charging member comprises a support, an elastic layer, and a surface layer, and the surface layer contains a polymer having an Si—O—Ta bond and having a structural unit represented by the following structural formula (1) and a structural unit represented by the following structural formula (2).Type: GrantFiled: February 10, 2012Date of Patent: August 6, 2013Assignee: Canon Kabushiki KaishaInventors: Yuya Tomomizu, Noriaki Kuroda, Noriko Nagamine
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Patent number: 8469867Abstract: A charging member that achieves a high level of compatibility between the suppression of the bleeding of a low-molecular weight component from its elastic layer to its surface and charging performance for an electrophotographic photosensitive member. The charging member has a substrate, an elastic layer, and a surface layer. The surface layer contains a polymer having a Si-O-Ti bond, and the polymer has a constitutional unit represented by the following general formula (1) and a constitutional unit represented by the following general formula (2).Type: GrantFiled: May 12, 2011Date of Patent: June 25, 2013Assignee: Canon Kabushiki KaishaInventors: Noriaki Kuroda, Noriko Nagamine, Yuya Tomomizu
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Patent number: 8447214Abstract: To provide a charging member to the surface of which any toners and so forth can be kept from adhering and which can exhibit a stable charging performance. The charging member has a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having an Si—O—B linkage and having a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (2).Type: GrantFiled: February 21, 2012Date of Patent: May 21, 2013Assignee: Canon Kabushiki KaishaInventors: Yuya Tomomizu, Noriaki Kuroda, Noriko Nagamine
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Patent number: 8401425Abstract: Provided is a charging member capable of suppressing adhesion of toner or the like to a surface. The charging member comprises: a support; an elastic layer; and a surface layer, and the surface layer contains a polymer having an Si—O—Sr bond and having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2).Type: GrantFiled: February 8, 2012Date of Patent: March 19, 2013Assignee: Canon Kabushiki KaishaInventors: Noriaki Kuroda, Noriko Nagamine
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Publication number: 20120148306Abstract: To provide a charging member to the surface of which any toners and so forth can be kept from adhering and which can exhibit a stable charging performance. The charging member has a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having an Si—O—B linkage and having a constitutional unit represented by the following formula (1) and a constitutional unit represented by the following formula (2).Type: ApplicationFiled: February 21, 2012Publication date: June 14, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Yuya Tomomizu, Noriaki Kuroda, Noriko Nagamine
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Publication number: 20120141159Abstract: A charging member is provided with a surface layer that can not easily wear even due to its contact with a photosensitive member and also has an appropriate elasticity contributing to the formation of an appropriate nip between it and the photosensitive member.Type: ApplicationFiled: February 8, 2012Publication date: June 7, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriko Nagamine, Noriaki Kuroda, Yuya Tomomizu
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Publication number: 20120141160Abstract: Provided is a charging member provided with a surface layer capable of suppressing the bleeding of a low-molecular weight component from an elastic layer with improved reliability. The charging member comprises a support, an elastic layer, and a surface layer, and the surface layer contains a polymer having an Si—O—Ta bond and having a structural unit represented by the following structural formula (1) and a structural unit represented by the following structural formula (2).Type: ApplicationFiled: February 10, 2012Publication date: June 7, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Yuya Tomomizu, Noriaki Kuroda, Noriko Nagamine
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Publication number: 20120134709Abstract: Provided is a charging member capable of suppressing adhesion of toner or the like to a surface. The charging member comprises: a support; an elastic layer; and a surface layer, and the surface layer contains a polymer having an Si—O—Sr bond and having a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2).Type: ApplicationFiled: February 8, 2012Publication date: May 31, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriaki Kuroda, Noriko Nagamine
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Publication number: 20120121296Abstract: Provided is a charging member, which has excellent follow-up property to the rotation of a photosensitive drum and can charge an electrophotographic photosensitive member more stably. The charging member is a charging member, comprising a mandrel, an elastic layer formed on an outer periphery of the mandrel, and a surface layer formed on an outer periphery of the elastic layer, in which the surface layer comprises at least one selected from hydroxylated fullerene and oxidized fullerene, and a binder.Type: ApplicationFiled: November 14, 2011Publication date: May 17, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriaki Kuroda, Noriko Nagamine
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Publication number: 20120107565Abstract: Provided is a charging member having a rough surface, thereby suppressing adhesion of dirt on the surface. A charging member having a supporting member, an elastic layer and a surface layer, in which the surface layer contains a polymer compound, which has a Si—O-M bond and at least one structural unit selected from structural units represented by the following general formula (1) and the following general formula (2), and has a structural unit represented by the following general formula (3); the charging member has cracks developing from the surface thereof and reaching the elastic layer; and the cracks each have convexly raised edges, by which the surface thereof is roughened.Type: ApplicationFiled: January 6, 2012Publication date: May 3, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriaki Kuroda, Noriko Nagamine, Yuya Tomomizu
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Publication number: 20120093539Abstract: Provided is a charging member having a high relative dielectric constant and a small surface free energy, the charging member being capable of maintaining its high relative dielectric constant over a long time period. Also provided are a process cartridge and an electrophotographic apparatus effective in increasing a printing speed and lengthening the lifetime of the electrophotographic apparatus. The charging member is a charging member comprising a support, an elastic layer, and a surface layer, wherein the surface layer comprises a cured product layer of a coating agent containing a reaction product between a hydrolyzable silane compound and titanium oxide particles having hydroxyl groups on surfaces thereof at a content of from 0.7 mass % to 35 mass %. The electrophotographic apparatus and the process cartridge each include the charging member.Type: ApplicationFiled: December 9, 2011Publication date: April 19, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriko Nagamine, Noriaki Kuroda
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Publication number: 20120082481Abstract: A charging member is provided which has a surface layer that can more surely keep bleeding from occurring. It is a charging member having a substrate, an elastic layer and a surface layer; the surface layer containing a high-molecular compound having a constituent unit represented by the following formula (1) and a constituent unit represented by the following formula (2), and having an Si—O—Zr linkage.Type: ApplicationFiled: December 12, 2011Publication date: April 5, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Noriko Nagamine, Noriaki Kuroda
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Publication number: 20120076535Abstract: A charging member is provided in which exudation of a low molecular weight component from an elastic layer to the surface is suppressed, and at the same time, charging performance of the electrophotographic photosensitive member are provided at a high level.Type: ApplicationFiled: December 5, 2011Publication date: March 29, 2012Inventors: Noriko Nagamine, Noriaki Kuroda, Yuya Tomomizu
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Patent number: 8092358Abstract: The present invention provides a charging member which can maintain excellent wear resistance even though being used repeatedly. In the charging member having a surface layer, the surface layer is a surface layer constituted by at least one selected from silsesquioxanes having structures represented by a compound (1), a compound (2), a compound (3), a compound (4), a compound (5) and a compound (6), and a polysiloxane having a first unit represented by SiO0.5R1(OR2)(OR3), a second unit represented by SiO1.0R4(OR5) and a third unit represented by SiO1.5R6, wherein the silsesquioxane is contained in the polysiloxane.Type: GrantFiled: April 5, 2011Date of Patent: January 10, 2012Assignee: Canon Kabushiki KaishaInventors: Yoko Kuruma, Noriaki Kuroda, Noriko Nagamine
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Publication number: 20110217072Abstract: The present invention relates to a charging member that achieves a high level of compatibility between the suppression of the bleeding of a low-molecular weight component from its elastic layer to its surface and charging performance for an electrophotographic photosensitive member. The charging member has a substrate, an elastic layer, and a surface layer. The surface layer contains a polymer having a Si—O—Ti bond, and the polymer has a constitutional unit represented by the following general formula (1) and a constitutional unit represented by the following general formula (2).Type: ApplicationFiled: May 12, 2011Publication date: September 8, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Noriaki Kuroda, Noriko Nagamine, Yuya Tomomizu
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Publication number: 20110182617Abstract: The present invention provides a charging member which can maintain excellent wear resistance even though being used repeatedly. In the charging member having a surface layer, the surface layer is a surface layer constituted by at least one selected from silsesquioxanes having structures represented by a compound (1), a compound (2), a compound (3), a compound (4), a compound (5) and a compound (6), and a polysiloxane having a first unit represented by SiO0.5R1(OR2)(OR3), a second unit represented by SiO1.0R4(OR5) and a third unit represented by SiO1.5R6, wherein the silsesquioxane is contained in the polysiloxane.Type: ApplicationFiled: April 5, 2011Publication date: July 28, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Yoko Kuruma, Noriaki Kuroda, Noriko Nagamine