Patents by Inventor Shinya Obara
Shinya Obara 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: 8431294Abstract: Provided is an electrostatic charge image developing toner capable of reproducing color exhibiting high lightness and chroma, and obtaining a wide color reproduction range. Disclosed is the toner possessing a toner particle containing at least a binder resin and a colorant, wherein the colorant possesses a yellowish color nonfluorescent dye exhibiting a peak wavelength of an absorption spectrum being in a wavelength range of 400-480 nm, and a fluorescent dye exhibiting a peak wavelength of an emission spectrum being in a wavelength range of 480-560 nm, wherein the nonfluorescent dye has a content of 2-8 parts by weight, based on 100 parts by weight of the binder resin, and the fluorescent dye has a content of 0.05-0.2 parts by weight, based on 100 parts by weight of the resin, provided that a content ratio of the nonfluorescent dye to the fluorescent dye is 15-150.Type: GrantFiled: December 7, 2010Date of Patent: April 30, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Hidehito Haruki, Hiroyuki Yasukawa, Shinya Obara
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Publication number: 20130004890Abstract: A toner used for electrostatic latent image development which is excellent in fixing separability with maintaining sufficient low temperature fixability even in a high-speed machine and is also superior in crashing resistance, comprising toner particles, each comprising a core particle and a shell layer provided on the surface of the core particle, wherein the core particle comprises a binder resin containing a styrene-acrylic resin and a first styrene-acrylic modified polyester, and the shell comprises a second styrene-acrylic modified polyester resin.Type: ApplicationFiled: June 20, 2012Publication date: January 3, 2013Applicant: Konica Minolta Business Technologies, Inc.Inventors: Shinya OBARA, Tatsuya NAGASE, Noboru UEDA, Junya ONISHI, Tatsuya FUJISAKI, Kenshi MIYAJIMA
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Publication number: 20120264046Abstract: Disclosed is a toner for electrostatic image development that satisfies both low-temperature fixing ability and excellent high-temperature storage stability, achieves excellent charge property and shatter resistance, and consequently can form a high-quality image even by a high-performance machine such as a high-speed machine. The toner is composed of toner particles obtained by forming a shell layer containing a styrene-acryl-modified polyester resin on the surface of each of core particles comprising a binder resin containing at least a styrene-acrylic resin. The styrene-acryl-modified polyester resin is obtained bonding a styrene-acrylic polymer segment to a terminal of a polyester segment, and the content of the styrene-acrylic polymer segment in the styrene-acryl-modified polyester resin is 5% by mass or more and 30% by mass or less.Type: ApplicationFiled: April 13, 2012Publication date: October 18, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Junya ONISHI, Shiro HIRANO, Satoshi UCHINO, Noboru UEDA, Shinya OBARA
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Patent number: 8236472Abstract: Provided is a method for forming an image with a set of electrostatic charge image developing toners using a digital electrophotographic method, provided that the set of electrostatic charge image developing toners comprises a black toner and a light gray toner, the method comprising the steps of: forming an electrostatic latent image on an image support; developing the electrostatic latent image with the black toner to form a black toner image; developing the electrostatic latent image with the light gray toner to form a light gray toner image; and fixing the black toner image and the light gray toner image, wherein the black toner and the light gray toner each independently contains a wax having an endothermic peak in the range of 60 to 105° C.; and the light gray toner has a transmittance in the range of 40 to 90%.Type: GrantFiled: November 24, 2009Date of Patent: August 7, 2012Assignee: Konica Minolta Business Technologies, Inc.Inventors: Tatsuya Fujisaki, Kaori Soeda, Shinya Obara, Natsuko Kusaka
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Patent number: 8178267Abstract: A set of toners comprising a yellow toner, a magenta toner, a cyan toner and a black toner for forming a full color image with an electrophotographic method, wherein the yellow toner comprises toner particles containing at least one pigment selected from the group consisting of C.I. Pigment Yellow 74, C.I. Pigment Yellow 139, C.I. Pigment Yellow 155, C.I. Pigment Yellow 180 and C.I.Type: GrantFiled: May 20, 2009Date of Patent: May 15, 2012Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naohiro Hirose, Meizo Shirose, Kaori Soeda, Shiro Hirano, Shinya Obara
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Publication number: 20120094227Abstract: A toner for developing an electrostatic latent image is disclosed, the toner being composed of toner particles which comprises toner mother particles containing a binding resin having a hydrophilic polar group, a coloring agent and a releasing agent, and an external additive, wherein a mass of Na atoms in a neighborhood of surface of the toner particles measured by the measuring method described below is 50 to 750?g in 1 g of toner particles. Measuring Method (a) Extracting Na atoms in the neighborhood of surface of the toner particles by stirring the toner particles and dilute hydrochloric acid, (b) Preparing sample for measurement by filtering the liquid extracting Na atoms, and (c) Measuring the mass of Na atoms in the sample via Induction Coupling Plasma Optical Emission Spectrometer.Type: ApplicationFiled: October 11, 2011Publication date: April 19, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shinya OBARA, Masahiro ANNO, Satoshi UCHINO, Hidehito HARUKI
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Patent number: 8084175Abstract: Provided is a set of toners comprising a yellow toner, a magenta toner, a cyan toner and a black toner for forming a full color image with an electrophotographic method, wherein the yellow toner comprises toner particles containing at east one pigment selected from the group consisting of C. I. Pigment Yellow 74, C. I. Pigment Yellow 139, C. I. Pigment Yellow 180, C. I. Pigment Yellow 185 and C. I.Type: GrantFiled: May 19, 2009Date of Patent: December 27, 2011Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naohiro Hirose, Kaori Soeda, Shinya Obara, Tatsuya Fujisaki, Yohei Ohno
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Patent number: 8029965Abstract: An objective is to provide a developing roller possessing a surface layer capable of suppressing the residual potential during repetitive use with no damage of interlayer adhesiveness, preventing toner leakage and contaminations caused by adhesion matter on the surface, and preventing developing unevenness because of even toner electrification; and also to provide an image forming method employing the developing roller. Also disclose is a developing roller possessing a conductive shaft, and a resin layer provided around an outer circumferential surface of the conductive shaft, wherein the resin layer possesses a surface layer containing a silicone copolymer resin as a principal component and a layer containing a polyamide resin as a principal component, that is provided immediately below the surface layer.Type: GrantFiled: January 11, 2008Date of Patent: October 4, 2011Assignee: Konica Minolta Business Technologies, Inc.Inventors: Satoshi Uchino, Shinya Obara, So Matsuya
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Patent number: 7981586Abstract: An electrophotographic image forming method is disclosed. The method includes steps of conveying a developer comprising a toner to a developing zone by a developing roller, and developing an electrostatic latent image formed on an electrostatic latent image carrying member by the developer, and the developing roller has an electroconductive shaft and a resin layer provided around the shaft, the resin layer comprises a surface layer containing silicone copolymer resin as the principal component and a layer containing resin-silica hybrid composite as a principal component provided directly under the surface layer.Type: GrantFiled: September 6, 2007Date of Patent: July 19, 2011Assignee: Konica Minolta Business Technologies, Inc.Inventors: Satoshi Uchino, Masahiro Anno, Takeo Oshiba, Okushi Okuyama, Shinya Obara
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Publication number: 20110151367Abstract: Provided is an electrostatic charge image developing toner capable of reproducing color exhibiting high lightness and chroma, and obtaining a wide color reproduction range. Disclosed is the toner possessing a toner particle containing at least a binder resin and a colorant, wherein the colorant possesses a yellowish color nonfluorescent dye exhibiting a peak wavelength of an absorption spectrum being in a wavelength range of 400-480 nm, and a fluorescent dye exhibiting a peak wavelength of an emission spectrum being in a wavelength range of 480-560 nm, wherein the nonfluorescent dye has a content of 2-8 parts by weight, based on 100 parts by weight of the binder resin, and the fluorescent dye has a content of 0.05-0.2 parts by weight, based on 100 parts by weight of the resin, provided that a content ratio of the nonfluorescent dye to the fluorescent dye is 15-150.Type: ApplicationFiled: December 7, 2010Publication date: June 23, 2011Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Hidehito HARUKI, Hiroyuki YASUKAWA, Shinya OBARA
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Publication number: 20110151371Abstract: A toner for electrostatic latent image development is disclosed, comprising colored particles containing a binder resin and a colorant, and an external-additive, wherein the external additive comprises boron nitride particles exhibiting a number average primary particle size of 10 to 500 nm. The production method of the toner is also disclosed.Type: ApplicationFiled: December 3, 2010Publication date: June 23, 2011Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shinya OBARA, Masahiro ANNO, Satoshi UCHINO, Hitomi MOTANI, Hidehito HARUKI
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Patent number: 7831183Abstract: A developing roller comprising: a shaft comprising an aluminum alloy; and a coating layer directly formed on a periphery of the shaft, the coating layer comprising a conducting agent and a binder comprising a resin, wherein the aluminum alloy comprises 0.2 to 0.8% by mass of silicon and 0.05 to 1.5% by mass of maganese, based on the total mass of the aluminum alloy.Type: GrantFiled: September 17, 2007Date of Patent: November 9, 2010Assignee: Konica Minolta Business Technologies, Inc.Inventors: Takeo Oshiba, Masahiro Anno, Okushi Okuyama, Satoshi Uchino, Shinya Obara, Ryuichi Hiramoto, So Matsuya
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Publication number: 20100159383Abstract: The method for manufacturing a color print by an electrophotographic image forming process employs forming toner images by non-contact developing electrostatic latent images on electrostatic latent image holding members in developing devices. For each color, cyan, magenta and yellow, there is a separate electrostatic latent image, a separate electrostatic latent image holding member and a separate developing device. In each developing device the holding member is arranged in a non-contact position with respect to the electrostatic latent image holding member at a development portion. The non-contact developing is carried out by flying the toner from the toner holding member to the electrostatic latent image holding member. The cyan toner exhibits a maximum chroma at lightness L*C of from 53-70.Type: ApplicationFiled: December 17, 2009Publication date: June 24, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Shinya OBARA, Shiro HIRANO, Natsuko KUSAKA, Hidehito HARUKI
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Publication number: 20100136476Abstract: Provided is a method for forming an image with a set of electrostatic charge image developing toners using a digital electrophotographic method, provided that the set of electrostatic charge image developing toners comprises a black toner and a light gray toner, the method comprising the steps of: forming an electrostatic latent image on an image support; developing the electrostatic latent image with the black toner to form a black toner image; developing the electrostatic latent image with the light gray toner to form a light gray toner image; and fixing the black toner image and the light gray toner image, wherein the black toner and the light gray toner each independently contains a wax having an endothermic peak in the range of 60 to 105° C.; and the light gray toner has a transmittance in the range of 40 to 90%.Type: ApplicationFiled: November 24, 2009Publication date: June 3, 2010Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tatsuya FUJISAKI, Kaori SOEDA, Shinya OBARA, Natsuko KUSAKA
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Publication number: 20090291378Abstract: Provided is a set of toners comprising a yellow toner, a magenta toner, a cyan toner and a black toner for forming a full color image with an electrophotographic method, wherein the yellow toner comprises toner particles containing at east one pigment selected from the group consisting of C. I. Pigment Yellow 74, C. I. Pigment Yellow 139, C. I. Pigment Yellow 180, C. I. Pigment Yellow 185 and C. I.Type: ApplicationFiled: May 19, 2009Publication date: November 26, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naohiro HIROSE, Kaori SOEDA, Shinya OBARA, Tatsuya FUJISAKI, Yohei OHNO
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Publication number: 20090291377Abstract: A set of toners comprising a yellow toner, a magenta toner, a cyan toner and a black toner for forming a full color image with an electrophotographic method, wherein the yellow toner comprises toner particles containing at least one pigment selected from the group consisting of C. I. Pigment Yellow 74, C. I. Pigment Yellow 139, C. I. Pigment Yellow 155, C. I. Pigment Yellow 180 and C. I.Type: ApplicationFiled: May 20, 2009Publication date: November 26, 2009Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Naohiro HIROSE, Meizo Shirose, Kaori Soeda, Shiro Hirano, Shinya Obara
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Publication number: 20090245892Abstract: In the present invention, provided can be a developing roller through which neither fog nor contamination inside the apparatus is generated, and no insufficient image density is produced, even though printing a large number of paper sheets (5000 paper sheets, for example). Also disclosed is a developing roller possessing a conductive shaft and a coating layer provided on an outer circumference of the conductive shaft, wherein the coating layer possesses a resin and a surface roughness particle, and the coating layer surface has a surface roughness Ra of 0.5-2.5 ?m and a Young's modulus Y of 1-200 MPa.Type: ApplicationFiled: March 25, 2009Publication date: October 1, 2009Applicant: Konica Minolta Business Technologies, Inc.Inventors: Shinya OBARA, Akira OHIRA, Takeo OSHIBA
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Publication number: 20080220363Abstract: A developing roller for electrophotographic image forming apparatus is disclosed. The developing roller has a shaft and a resin layer, and the resin layer comprises a binder resin, a resin particle having a particle diameter of 5 ?m to 30 ?m and a content of from 10% to 50% by weight with respect to the resin layer, and inorganic oxide particles having a number based average primary particle diameter of 5 nm to 100 nm and a content of 1% to 40% by weight with respect to the resin layer. An image forming method employing the developer roller is also disclosed.Type: ApplicationFiled: March 4, 2008Publication date: September 11, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Satoshi UCHINO, Masahiro ANNO, Takeo OSHIBA, Okushi OKUYAMA, Shinya OBARA, Ryuichi HIRAMOTO, So MATSUYA
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Publication number: 20080220361Abstract: An objective is to provide a developing roller possessing a surface layer capable of suppressing the residual potential during repetitive use with no damage of interlayer adhesiveness, preventing toner leakage and contaminations caused by adhesion matter on the surface, and preventing developing unevenness because of even toner electrification; and also to provide an image forming method employing the developing roller. Also disclose is a developing roller possessing a conductive shaft, and a resin layer provided around an outer circumferential surface of the conductive shaft, wherein the resin layer possesses a surface layer containing a silicone copolymer resin as a principal component and a layer containing a polyamide resin as a principal component, that is provided immediately below the surface layer.Type: ApplicationFiled: January 11, 2008Publication date: September 11, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Satoshi Uchino, Shinya Obara, So Matsuya
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Publication number: 20080070147Abstract: An electrophotographic image forming method is disclosed. The method includes steps of conveying a developer comprising a toner to a developing zone by a developing roller, and developing an electrostatic latent image formed on an electrostatic latent image carrying member by the developer, and the developing roller has an electroconductive shaft and a resin layer provided around the shaft, the resin layer comprises a surface layer containing silicone copolymer resin as the principal component and a layer containing resin-silica hybrid composite as a principal component provided directly under the surface layer.Type: ApplicationFiled: September 6, 2007Publication date: March 20, 2008Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Satoshi UCHINO, Masahiro ANNO, Takeo OSHIBA, Okushi OKUYAMA, Shinya OBARA