Patents by Inventor Kazuhiro KURAMOCHI
Kazuhiro KURAMOCHI 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: 10627730Abstract: An image forming method forms an image by performing charging, exposing, developing, and transferring in a rotation direction of a rotationally driven photoreceptor, wherein the charging is performed by a roller charging method, exposing a surface of the photoreceptor to light and eliminating charges on the surface of the photoreceptor are included between the developing and the transferring, the photoreceptor includes at least a charge transporting layer and a protective layer laminated on the charge transporting layer on a conductive support, and energy of light for irradiation in the exposing the surface of the photoreceptor to light is in a range of 0.0001 to 500 ?W/mm2 on the surface of the photoreceptor.Type: GrantFiled: August 9, 2018Date of Patent: April 21, 2020Assignee: KONICA MINOLTA, INC.Inventor: Kazuhiro Kuramochi
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Patent number: 10488808Abstract: An image forming apparatus includes: a transferer that transfers a toner image formed on a surface of a photo-conductor onto an image carrier; and an irradiator that irradiates the surface of the photo-conductor before transfer with light such that a potential of an image area where the toner image has been formed and a potential of a non-image area where the toner image has not been formed in the photo-conductor before transfer satisfy formula (1): 0?|Va|?|Vb|?200 [V]??(1) where |Va| represents the potential of the image area after the surface of the photo-conductor before transfer is irradiated with light, and |Vb| represents the potential of the non-image area after the surface of the photo-conductor before transfer is irradiated with light.Type: GrantFiled: December 28, 2018Date of Patent: November 26, 2019Assignee: KONICA MINOLTA, INC.Inventors: Takeshi Ishida, Kazuhiro Kuramochi, Seisuke Maeda
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Publication number: 20190212670Abstract: An image forming apparatus includes: a transferer that transfers a toner image formed on a surface of a photo-conductor onto an image carrier; and an irradiator that irradiates the surface of the photo-conductor before transfer with light such that a potential of an image area where the toner image has been formed and a potential of a non-image area where the toner image has not been formed in the photo-conductor before transfer satisfy formula (1): 0?|Va|?|Vb|?200 [V]??(1) where |Va| represents the potential of the image area after the surface of the photo-conductor before transfer is irradiated with light, and |Vb| represents the potential of the non-image area after the surface of the photo-conductor before transfer is irradiated with light.Type: ApplicationFiled: December 28, 2018Publication date: July 11, 2019Inventors: Takeshi ISHIDA, Kazuhiro KURAMOCHI, Seisuke MAEDA
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Patent number: 10324387Abstract: Provided is an electrophotographic photoreceptor obtained by laminating a photosensitive layer and a surface protective layer in this order on a conductive support, wherein the surface protective layer contains conductive fine particles and crosslinkable organic fine particles, and either the conductive fine particles or the crosslinkable organic fine particles have been subjected to surface modification with a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.Type: GrantFiled: April 9, 2018Date of Patent: June 18, 2019Assignee: KONICA MINOLTA, INC.Inventors: Takeshi Ishida, Seisuke Maeda, Kazuhiro Kuramochi
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Publication number: 20190094723Abstract: An image forming method forms an image by performing charging, exposing, developing, and transferring in a rotation direction of a rotationally driven photoreceptor, wherein the charging is performed by a roller charging method, exposing a surface of the photoreceptor to light and eliminating charges on the surface of the photoreceptor are included between the developing and the transferring, the photoreceptor includes at least a charge transporting layer and a protective layer laminated on the charge transporting layer on a conductive support, and energy of light for irradiation in the exposing the surface of the photoreceptor to light is in a range of 0.0001 to 500 ?W/mm2 on the surface of the photoreceptor.Type: ApplicationFiled: August 9, 2018Publication date: March 28, 2019Inventor: Kazuhiro KURAMOCHI
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Patent number: 10234776Abstract: An electrophotographic photoreceptor has a charge generating layer, a charge transporting layer, and an outermost surface layer laminated in this order on a conductive support, wherein the outermost surface layer contains composite structural particles obtained by coating inorganic particles with oxygen-deficient conductive tin oxide, and the composite structural particles have an L value of 80 to 95, and primary particles thereof have an average particle diameter of 35 to 200 nm.Type: GrantFiled: April 30, 2018Date of Patent: March 19, 2019Assignee: KONICA MINOLTA, INC.Inventors: Seisuke Maeda, Kazunori Kurimoto, Kazuhiro Kuramochi
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Patent number: 10203625Abstract: An electrophotographic image forming apparatus includes: an electrophotographic photosensitive body including an electroconductive substrate, and a charge generating layer, a charge transfer layer and a surface protective layer laminated on the substrate in this order, and a charging roller for causing contact electrification on the surface of the electrophotographic photosensitive body, wherein at least the surface protective layer contains inorganic microparticles having a fluorine compound on the surfaces and a binder resin, and the surface of the charging roller has a maximum height roughness Rz?0.5 ?m.Type: GrantFiled: December 11, 2017Date of Patent: February 12, 2019Assignee: KONICA MINOLTA, INC.Inventors: Kazuhiro Kuramochi, Seisuke Maeda, Kuniaki Kashiwakura
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Patent number: 10175591Abstract: In an electrophotographic photoreceptor, an electric charge generating layer and an electric charge transport layer are laminated on a conductive support body in this order, a layer configuring an outermost surface of the electrophotographic photoreceptor contains composite structure particles in which a core material is inorganic particles, and the inorganic particles are coated with tin oxide doped with aluminum, and an average particle diameter of primary particles of the composite structure particles is 50 nm to 200 nm.Type: GrantFiled: November 21, 2017Date of Patent: January 8, 2019Assignee: KONICA MINOLTA, INC.Inventors: Seisuke Maeda, Kazunori Kurimoto, Kazuhiro Kuramochi
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Publication number: 20180335707Abstract: An electrophotographic photoreceptor has a charge generating layer, a charge transporting layer, and an outermost surface layer laminated in this order on a conductive support, wherein the outermost surface layer contains composite structural particles obtained by coating inorganic particles with oxygen-deficient conductive tin oxide, and the composite structural particles have an L value of 80 to 95, and primary particles thereof have an average particle diameter of 35 to 200 nm.Type: ApplicationFiled: April 30, 2018Publication date: November 22, 2018Inventors: Seisuke MAEDA, Kazunori KURIMOTO, Kazuhiro KURAMOCHI
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Publication number: 20180307148Abstract: Provided is an electrophotographic photoreceptor obtained by laminating a photosensitive layer and a surface protective layer in this order on a conductive support, wherein the surface protective layer contains conductive fine particles and crosslinkable organic fine particles, and either the conductive fine particles or the crosslinkable organic fine particles have been subjected to surface modification with a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.Type: ApplicationFiled: April 9, 2018Publication date: October 25, 2018Inventors: Takeshi Ishida, Seisuke Maeda, Kazuhiro Kuramochi
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Patent number: 10101679Abstract: Provided is an electrographic photoconductor resistant to surface discharge and having good wear resistance. The electrographic photoconductor has a conductive support and a photosensitive layer disposed on the conductive support, the photosensitive layer containing a charge generation material and a charge transport material. A layer forming the surface of the electrographic photoconductor contains a resin binder forming the layer and a layered carbide dispersed in the resin binder. The layer forming the surface has a light transmittance in the range of 20 to 98% at a wavelength of 350 to 800 nm.Type: GrantFiled: November 8, 2016Date of Patent: October 16, 2018Assignee: KONICA MINOLTA, INC.Inventors: Seisuke Maeda, Kazunori Kurimoto, Kazuhiro Kuramochi
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Patent number: 10025208Abstract: An electrophotographic photoreceptor includes: a conductive support; and a photosensitive layer which contains an electric charge generating material and an electric charge transport material, wherein a layer configuring a surface of the electrophotographic photoreceptor contains a resin binder, and conductive particles A and B dispersed in the resin binder, the conductive particles A have a single peak and volume resistance ?1, the conductive particles B have a single peak and volume resistance ?2, when a particle diameter of the conductive particles A is set to d1, and a particle diameter of the conductive particles B is set to d2, Expression (1) is satisfied, and when the volume resistance of the conductive particles A is set to ?1, and the volume resistance of the conductive particles B is set to ?2, Expression (2) is satisfied: 4×d2?d1?20×d2??(1) 10×?1<?2??(2).Type: GrantFiled: March 6, 2017Date of Patent: July 17, 2018Assignee: KONICA MINOLTA, INC.Inventors: Seisuke Maeda, Kazuhiro Kuramochi
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Publication number: 20180164710Abstract: An electrophotographic image forming apparatus includes: an electrophotographic photosensitive body including an electroconductive substrate, and a charge generating layer, a charge transfer layer and a surface protective layer laminated on the substrate in this order, and a charging roller for causing contact electrification on the surface of the electrophotographic photosensitive body, wherein at least the surface protective layer contains inorganic microparticles having a fluorine compound on the surfaces and a binder resin, and the surface of the charging roller has a maximum height roughness Rz?0.5 ?m.Type: ApplicationFiled: December 11, 2017Publication date: June 14, 2018Inventors: Kazuhiro KURAMOCHI, Seisuke MAEDA, Kuniaki KASHIWAKURA
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Publication number: 20180143545Abstract: In an electrophotographic photoreceptor, an electric charge generating layer and an electric charge transport layer are laminated on a conductive support body in this order, a layer configuring an outermost surface of the electrophotographic photoreceptor contains composite structure particles in which a core material is inorganic particles, and the inorganic particles are coated with tin oxide doped with aluminum, and an average particle diameter of primary particles of the composite structure particles is 50 nm to 200 nm.Type: ApplicationFiled: November 21, 2017Publication date: May 24, 2018Inventors: Seisuke MAEDA, Kazunori KURIMOTO, Kazuhiro KURAMOCHI
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Patent number: 9946176Abstract: Provided is an electrophotographic photoreceptor containing a conductive support having thereon a photosensitive layer and a surface layer laminated in that order, wherein the surface layer contains a conductive filler having a number average primary particle size of 10 to 500 nm in a resin; and the conductive filler is treated with a surface treatment agent containing a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.Type: GrantFiled: March 18, 2016Date of Patent: April 17, 2018Assignee: KONICA MINOLTA, INC.Inventors: Seisuke Maeda, Kazuhiro Kuramochi
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Publication number: 20170285496Abstract: An electrophotographic photoreceptor includes: a conductive support; and a photosensitive layer which contains an electric charge generating material and an electric charge transport material, wherein a layer configuring a surface of the electrophotographic photoreceptor contains a resin binder, and conductive particles A and B dispersed in the resin binder, the conductive particles A have a single peak and volume resistance ?1, the conductive particles B have a single peak and volume resistance ?2, when a particle diameter of the conductive particles A is set to d1, and a particle diameter of the conductive particles B is set to d2, Expression (1) is satisfied, and when the volume resistance of the conductive particles A is set to ?1, and the volume resistance of the conductive particles B is set to ?2, Expression (2) is satisfied: 4×d2?d1?20×d2??(1) 10×?1<?2??(2)Type: ApplicationFiled: March 6, 2017Publication date: October 5, 2017Inventors: Seisuke MAEDA, Kazuhiro Kuramochi
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Publication number: 20170131645Abstract: Provided is an electrographic photoconductor resistant to surface discharge and having good wear resistance. The electrographic photoconductor has a conductive support and a photosensitive layer disposed on the conductive support, the photosensitive layer containing a charge generation material and a charge transport material. A layer forming the surface of the electrographic photoconductor contains a resin binder forming the layer and a layered carbide dispersed in the resin binder. The layer forming the surface has a light transmittance in the range of 20 to 98% at a wavelength of 350 to 800 nm.Type: ApplicationFiled: November 8, 2016Publication date: May 11, 2017Inventors: Seisuke MAEDA, Kazunori KURIMOTO, Kazuhiro KURAMOCHI
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Publication number: 20160282735Abstract: Provided is an electrophotographic photoreceptor containing a conductive support having thereon a photosensitive layer and a surface layer laminated in that order, wherein the surface layer contains a conductive filler having a number average primary particle size of 10 to 500 nm in a resin; and the conductive filler is treated with a surface treatment agent containing a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.Type: ApplicationFiled: March 18, 2016Publication date: September 29, 2016Inventors: Seisuke MAEDA, Kazuhiro KURAMOCHI