Patents by Inventor Hirokazu Chazono
Hirokazu Chazono 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: 7572406Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: GrantFiled: November 30, 2006Date of Patent: August 11, 2009Assignee: Taiyo Yuden Co., Ltd.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Patent number: 7566439Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: GrantFiled: November 30, 2006Date of Patent: July 28, 2009Assignee: Taiyo Yuden Co., Ltd.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Patent number: 7354642Abstract: A multilayer displacement element is formed by alternately stacking a plurality of ceramic layers and a multiplicity of internal electrodes, wherein each of the ceramic layers is composed of ceramic grains containing barium titanate as a main component and each of the internal electrodes is a metallic film with a mesh shape. The meshed shape of metallic films leads to a reduced contact area between the metallic films and the ceramic layers. Therefore, the displacement of the ceramic layers can be less restricted by the metallic films and thus the amount of displacement of the ceramic layers can be increased. The ceramic grains preferably have an average diameter equal to or larger than 3.5 ?m and it is desirable that the ratio of one grain to one layer for the ceramic layer be equal to or larger than 20%.Type: GrantFiled: July 15, 2004Date of Patent: April 8, 2008Assignee: Taiyo Yuden Co., Ltd.Inventors: Hisamitsu Shizuno, Hirokazu Chazono, Hiroshi Kishi
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Patent number: 7271114Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: GrantFiled: March 24, 2004Date of Patent: September 18, 2007Assignee: Taiyo Yuden Co., Ltd.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Publication number: 20070104640Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: ApplicationFiled: November 30, 2006Publication date: May 10, 2007Applicant: TAIYO YUDEN CO., LTD.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Publication number: 20070104970Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: ApplicationFiled: November 30, 2006Publication date: May 10, 2007Applicant: TAIYO YUDEN CO., LTD.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Patent number: 7020941Abstract: A method for manufacturing a multilayer ceramic capacitor includes the steps of forming a ceramic slurry, forming ceramic green sheets from the ceramic slurry, printing internal electrode patterns on the ceramic green sheets, generating a laminated body by stacking the ceramic green sheets provided with the internal electrode patterns printed thereon, dicing the laminated body to thereby form chip-shaped ceramic bodies and sintering the chip-shaped ceramic bodies. The ceramic slurry includes a glass component containing one or more additive elements selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.Type: GrantFiled: November 6, 2003Date of Patent: April 4, 2006Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Publication number: 20040262037Abstract: A multilayer displacement element is formed by alternately stacking a plurality of ceramic layers and a multiplicity of internal electrodes, wherein each of the ceramic layers is composed of ceramic grains containing barium titanate as a main component and each of the internal electrodes is a metallic film with a mesh shape. The meshed shape of metallic films leads to a reduced contact area between the metallic films and the ceramic layers. Therefore, the displacement of the ceramic layers can be less restricted by the metallic films and thus the amount of displacement of the ceramic layers can be increased. The ceramic grains preferably have an average diameter equal to or larger than 3.5 &mgr;m and it is desirable that the ratio of one grain to one layer for the ceramic layer be equal to or larger than 20%.Type: ApplicationFiled: July 15, 2004Publication date: December 30, 2004Applicant: TAIYO YUDEN CO., LTD.Inventors: Hisamitsu Shizuno, Hirokazu Chazono, Hiroshi Kishi
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Publication number: 20040188002Abstract: A ceramic powder having a perovskite structure is manufactured by synthesizing a ceramic powder by a dry synthesis process and then heat-treating the synthesized ceramic powder in a solution. The dry synthesis method includes a solid phase synthesis method, an oxalate method, a citric acid method and a gas phase synthesis method.Type: ApplicationFiled: March 24, 2004Publication date: September 30, 2004Applicant: TAIYO YUDEN CO., LTD.Inventors: Chie Kawamura, Atsushi Tanada, Hirokazu Chazono
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Publication number: 20040110357Abstract: A method for manufacturing a multilayer ceramic capacitor includes the steps of forming a ceramic slurry, forming ceramic green sheets from the ceramic slurry, printing internal electrode patterns on the ceramic green sheets, generating a laminated body by stacking the ceramic green sheets provided with the internal electrode patterns printed thereon, dicing the laminated body to thereby form chip-shaped ceramic bodies and sintering the chip-shaped ceramic bodies. The ceramic slurry includes a glass component containing one or more additive elements selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.Type: ApplicationFiled: November 6, 2003Publication date: June 10, 2004Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 6721167Abstract: A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved.Type: GrantFiled: June 12, 2003Date of Patent: April 13, 2004Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Publication number: 20040066603Abstract: A multi-layer capacitor includes a plurality of dielectric layers, a pair of external electrodes and a multiplicity of internal electrode layers, each internal electrode layer being interposed between every two neighboring dielectric layers. Said two neighboring internal electrode layers and the dielectric layer disposed therebetween form a unit capacitor so that the multiplicity of internal electrode layers and the dielectric layers therebetween constitute a stack of three or more vertically stacked unit capacitors. The electrostatic capacitance of the unit capacitor located at a center of the stack is greater than those of the unit capacitors located at an upper end and a lower end of the stack.Type: ApplicationFiled: July 2, 2003Publication date: April 8, 2004Applicant: Taiyo Yuden Co. , Ltd.Inventors: Kenji Saito, Hirokazu Chazono
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Patent number: 6710998Abstract: A multi-layer capacitor includes a plurality of dielectric layers, a pair of external electrodes and a multiplicity of internal electrode layers, each internal electrode layer being interposed between every two neighboring dielectric layers. Said two neighboring internal electrode layers and the dielectric layer disposed therebetween form a unit capacitor so that the multiplicity of internal electrode layers and the dielectric layers therebetween constitute a stack of three or more vertically stacked unit capacitors. The electrostatic capacitance of the unit capacitor located at a center of the stack is greater than those of the unit capacitors located at an is upper end and a lower end of the stack.Type: GrantFiled: July 2, 2003Date of Patent: March 23, 2004Assignee: Taiyo Yuden Co., Ltd.Inventors: Kenji Saito, Hirokazu Chazono
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Patent number: 6673461Abstract: A multilayer ceramic capacitor is formed by alternately stacking a plurality of dielectric layers and a multiplicity of internal electrodes, which are connected to a pair of external electrodes. Each of the dielectric layers is obtained from a dielectric ceramic compound composed of ceramic grains and a glass component connecting the ceramic grains, and the glass component contains one or more additive elements in a form of a solid solution. The additive elements are selected from the group consisting of Mn, V, Cr, Mo, Fe, Ni, Cu and Co.Type: GrantFiled: March 30, 2001Date of Patent: January 6, 2004Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 6656865Abstract: A ceramic capacitor containing at least one dielectric layer formed from a dielectric ceramic composition comprising a sintered body containing ceramic particles having a core/shell structure in an amount of 15% or more based on the total ceramic particles of the sintered body, the core/shell structured particle being composed of a core portion, which is BaTiO3 crystal, and a shell portion surrounding the core portion, which is made of a solid solution comprising BaTiO3 as a major component, has excellent temperature characteristics and a long life-time.Type: GrantFiled: June 29, 2001Date of Patent: December 2, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Kenji Saito, Koichiro Morita, Youichi Mizuno, Yasunobu Kawamoto, Yoshikazu Okino, Noriyuki Kohzu, Hirokazu Chazono
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Publication number: 20030218856Abstract: A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved.Type: ApplicationFiled: June 12, 2003Publication date: November 27, 2003Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 6614644Abstract: A multilayer ceramic capacitor includes sintered laminated bodies having a plurality of dielectric layers alternately stacked with a multiplicity of internal electrodes, and a pair of external electrodes electrically coupled to the internal electrodes. The dielectric layer is of sintered ceramic grains. The ceramic grains include a core portion surrounded by a shell portion or a solid solution. The ceramic grains contain additive elements such as acceptor elements and/or rare earth elements. The additive elements are non-uniformly distributed in the core and/or shell portion of the ceramic grain or in the solid solution. Such non-uniform distribution of the additive elements in ceramic grains promotes or facilitates the re-oxidation process of the ceramic grains and also increases electrical resistance thereof. Accordingly, the operating life characteristics of the multilayer ceramic capacitors, especially those incorporating therein thin dielectric layers, can be improved.Type: GrantFiled: February 15, 2001Date of Patent: September 2, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Patent number: 6563690Abstract: A multilayer ceramic capacitor includes a multilayer ceramic body having alternately stacked ceramic layers and internal electrodes, the ceramic layers containing therein an acceptor representing one or more metallic elements for facilitating a reoxidation process of the multilayer ceramic body, and a pair of external electrodes installed at two opposite sides of the multilayer ceramic body, wherein the acceptor concentration in the ceramic layers stacked at a central portion of the multilayer ceramic body is higher than that in the remaining ceramic layers of the multilayer ceramic body.Type: GrantFiled: February 15, 2001Date of Patent: May 13, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Kishi, Hirokazu Chazono, Hisamitsu Shizuno
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Patent number: 6514603Abstract: A multilayer ceramic capacitor comprises dielectric ceramic layers and conductive layers, the dielectric ceramic layers including core-shell structured ceramic particles. The ceramic particles disposed nearer to the conductive layers have shell portions having thickness larger than those of the ceramic particles disposed farther from the conductive layers.Type: GrantFiled: February 2, 2001Date of Patent: February 4, 2003Assignee: Taiyo Yuden Co., Ltd.Inventor: Hirokazu Chazono
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Publication number: 20020036882Abstract: A multilayer ceramic capacitor includes a multilayer ceramic body having alternately stacked ceramic layers and internal electrodes, the ceramic layers containing therein an acceptor representing one or more metallic elements for facilitating a reoxidation process of the multilayer ceramic body, and a pair of external electrodes installed at two opposite sides of the multilayer ceramic body, wherein the acceptor concentration in the ceramic layers stacked at a central portion of the multilayer ceramic body is higher than that in the remaining ceramic layers of the multilayer ceramic body.Type: ApplicationFiled: February 15, 2001Publication date: March 28, 2002Applicant: Taiyo Yuden Co., Ltd.Inventors: Hiroshi Kishi, Hirokazu Chazono, Hisamitsu Shizuno