Patents by Inventor Atsuhiro Sumiya
Atsuhiro Sumiya 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: 7272876Abstract: A method of producing a laminated dielectric element of high quality, free of delamination. A method of producing a laminated dielectric element 1 by alternately laminating dielectric ceramic layers 12 and base metal electrode layers 13, comprising the steps of printing electrodes by applying a paste material for the base metal electrodes onto the surfaces of at least one side of the ceramic green sheets, laminating and press-adhering the ceramic green sheets to fabricate a laminate thereof, dewaxing the laminate, reducing the electrodes to form base metal electrode layers by heating the laminate while flowing an atmospheric gas and by reducing the paste material for the base metal electrodes, and sintering the laminate.Type: GrantFiled: November 4, 2003Date of Patent: September 25, 2007Assignees: Nippon Soken, Inc., DENSO CorporationInventors: Atsuhiro Sumiya, Eturo Yasuda, Hitoshi Shindo, Akira Fujii, Takashi Yamamoto, Toshiatsu Nagaya, Kumi Sawaguchi, Ryoji Kai
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Publication number: 20060210781Abstract: This invention provides a stacked ceramic body that prevents reaction between components of dielectric layers and components of electrode layers of an unsintered stacked body during sintering and in which both components do not easily form a liquid phase, and a production method of such a stacked ceramic body. A print portion 13 is formed on a green sheet 1, 12 containing lead by use of an electrode paste consisting of copper oxide as its main component. A desired number of print sheets 10 are stacked to give an unsintered stacked body 15. Degreasing is conducted in an atmosphere to degrease organic components. The print portion 13 is subjected to reducing treatment in a reducing atmosphere containing hydrogen and is converted to a print portion 13 containing copper as its main component. The unsintered stacked body 15 is sintered in a reducing atmosphere.Type: ApplicationFiled: May 2, 2006Publication date: September 21, 2006Applicant: Denso CorporationInventors: Toshiatsu Nagaya, Takashi Yamamoto, Akira Fujii, Atsuhiro Sumiya, Hitoshi Shindo, Eturo Yasuda
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Patent number: 7083745Abstract: This invention provides a method of producing a laminate type dielectric device free from peeling of an electrode layer and a ceramic layer and from voids in both electrode layer and ceramic layer, and an electrode paste material. The invention relates also to an electrode paste material for constituting electrode layers of a laminate type dielectric device produced by at least the steps of alternately laminating ceramic layers 11 containing a lead element as a constituent component and electrode layers 2, and degreasing and baking the laminate, wherein the electrode paste material contains CuO as a principal component of a starting material of an electrically conductive material, a solvent, a binder, and a cooperative material consisting of at least one kind of the main components constituting the ceramic layer 11.Type: GrantFiled: December 28, 2001Date of Patent: August 1, 2006Assignees: DENSO Corporation, Nippon Soken, Inc.Inventors: Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda, Takashi Yamamoto, Toshiatsu Nagaya
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Patent number: 7063813Abstract: This invention provides a stacked ceramic body that prevents reaction between components of dielectric layers and components of electrode layers of an unsintered stacked body during sintering and in which both components do not easily form a liquid phase, and a production method of such a stacked ceramic body. A print portion 13 is formed on a green sheet 1, 12 containing lead by use of an electrode paste consisting of copper oxide as its main component. A desired number of print sheets 10 are stacked to give an unsintered stacked body 15. Degreasing is conducted in an atmosphere to degrease organic components. The print portion 13 is subjected to reducing treatment in a reducing atmosphere containing hydrogen and is converted to a print portion 13 containing copper as its main component. The unsintered stacked body 15 is sintered in a reducing atmosphere.Type: GrantFiled: December 13, 2002Date of Patent: June 20, 2006Assignee: Denso CorporationInventors: Toshiatsu Nagaya, Takashi Yamamoto, Akira Fujii, Atsuhiro Sumiya, Hitoshi Shindo, Eturo Yasuda
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Patent number: 6972060Abstract: This invention provides a method for producing a stacked ceramic body that does not require strict control of an oxygen partial pressure in a sintering gas. To produce a stacked ceramic body by alternately stacking dielectric layer and electrode layers, an unsintered stacked body 2 is prepared by alternately stacking unsintered dielectric layers containing a PZT type dielectric material and unsintered electrode layers containing an electrode material, and is sintered in a sintering gas to which a dielectric layer anti-reducing agent 21 and an electrode layer anti-oxidant 22 are introduced. Alternatively, sintering is conducted in a gas containing only the dielectric layer anti-reducing agent 21 or in a gas containing only the electrode layer anti-oxidant 22.Type: GrantFiled: April 3, 2003Date of Patent: December 6, 2005Assignee: Nippon Soken, Inc.Inventors: Eturo Yasuda, Atsuhiro Sumiya, Hitoshi Shindo, Toshiatsu Nagaya, Takashi Yamamoto
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Patent number: 6960271Abstract: A laminate type dielectric device is formed by alternately laminating dielectric ceramic layers and electrode layers and integrally baking the laminate product. The electode layers are mainly made of an electrically conductive base metal material having greater standard Gibbs free energy for the formation of a metal oxide at a baking temperature than that of the ceramic material constituting the dielectric ceramic layers. Segregation of the materials including the electrically conductive base metal material does not occur at portions sandwiched between adjacent positive and negative electrode layers among the dielectric ceramic layers.Type: GrantFiled: September 16, 2003Date of Patent: November 1, 2005Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Hitoshi Shindo, Etsuro Yasuda, Atsuhiro Sumiya, Takashi Yamamoto, Toshiatsu Nagaya
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Patent number: 6916754Abstract: A PZT dielectric ceramic material is sintered at a desired low temperature to prevent deterioration of the performance of the base material. An auxiliary oxide is used that is made by adding the oxide of at least one of tungsten and molybdenum to lead oxide in the following proportions: PbOx+(WO3y+MoO3z) where x+y+z=1, 0.005<y+z<0.4 and y, z?0. 0.5 mol % to 20 mol % of this auxiliary oxide is added to a mixture of a stock material of dielectric ceramic material or its calcination having a composition of ABO3 type dielectric ceramic material where 0.9 molar ratio or more lead is included in site A assuming the proportion of site B is 1, and the material is mixed, formed and sintered. The content of tungsten and molybdenum combined is less than 0.098 mole in proportion to 1 mole of lead and the density of the dielectric ceramic material after sintering is 7.5 g/cm3 larger.Type: GrantFiled: December 28, 2001Date of Patent: July 12, 2005Assignees: Nippon Soken, Inc., Denso CorporationInventors: Atsuhiro Sumiya, Hitoshi Shindo, Eturo Yasuda, Takumi Kataoka, Toshiatsu Nagaya, Akira Fujii, Takashi Yamamoto
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Patent number: 6809040Abstract: A method of manufacturing large-sized laminated dielectrics of high quality which permit adjustment of the atmosphere during sintering process to be accomplished easily, and which can eliminate the problems such as expansion due to reaction with the atmosphere gas. When a laminated body 1, consisting of oxide dielectric layers 2 and inner electrode layers 3 having a base metal such as Cu as a main component, is sintered in a reducing atmosphere, a mixed gas having CO2 gas as a main component and containing optional amount of CO gas and O2 gas is used. By using the equilibrium system of CO2⇄2CO+(1/2)O2 and adjusting the amounts of CO gas and O2 gas, oxygen partial pressure in the atmosphere gas can be easily and stably adjusted and fluctuation and variation in the atmosphere can be suppressed.Type: GrantFiled: August 1, 2002Date of Patent: October 26, 2004Assignee: Denso CorporationInventors: Atsuhiro Sumiya, Eturo Yasuda, Hitoshi Shindo, Yasunori Suzuki, Takashi Yamamoto, Toshiatsu Nagaya, Noriaki Kihara
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Publication number: 20040139599Abstract: A laminated dielectric element of high quality, free of delamination and a method of producing the same. A method of producing a laminated dielectric element 1 by alternately laminating dielectric ceramic layers 12 and base metal electrode layers 13, comprising the steps of printing electrodes by applying a paste material for the base metal electrodes onto the surfaces of at least one side of the ceramic green sheets, laminating and press-adhering the ceramic green sheets to fabricate a laminate thereof, dewaxing the laminate, reducing the electrodes to form base metal electrode layers by heating the laminate while flowing an atmospheric gas and by reducing the paste material for the base metal electrodes, and sintering the laminate.Type: ApplicationFiled: November 4, 2003Publication date: July 22, 2004Applicants: NIPPON SOKEN, INC., DENSO CORPORATIONInventors: Atsuhiro Sumiya, Eturo Yasuda, Hitoshi Shindo, Akira Fujii, Takashi Yamamoto, Toshiatsu Nagaya, Kumi Sawaguchi, Ryoji Kai
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Patent number: 6734607Abstract: An integrally fired, laminated electromechanical transducing element, fabricated using an inexpensive electrode material and having the electrode characteristic at least equivalent to that of the Ag—Pd electrode, is disclosed. Especially, in the integrally fired, laminated electromechanical transducing element according to the invention, (A) the rigidity of the internal electrode layers is low and the internal stress generated at the time of expansion or contraction of the ceramic layers is small, (B) the antimigration characteristic is superior, (C) the charge loss is small, the heat conductivity is high and the heat radiation characteristic is superior, and/or (D) the bonding strength between the ceramic layers and the electrode layers is high.Type: GrantFiled: December 28, 2001Date of Patent: May 11, 2004Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Toshiatsu Nagaya, Youta Iwamoto, Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda
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Publication number: 20040050477Abstract: This invention relates to a laminate type dielectric device capable of sufficiently bonding an electrode material such as Cu to a ceramic material by using an economical base metal material such as Cu, and fully exploiting the characteristics of a dielectric ceramic layer, a production method thereof, and an electrode paste material.Type: ApplicationFiled: September 16, 2003Publication date: March 18, 2004Applicants: Denso Corporation, Nippon Soken, Inc.Inventors: Hitoshi Shindo, Etsuro Yasuda, Atsuhiro Sumiya, Takashi Yamamoto, Toshiatsu Nagaya
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Patent number: 6690571Abstract: A laminate type dielectric device is formed by alternately laminating dielectric ceramic layers and electrode layers and integrally baking the laminate product. The electrode layers are mainly made of an electrically conductive base metal material having greater standard Gibbs free energy for the formation of a metal oxide at a baking temperature than that of the ceramic material constituting the dielectric ceramic layers. Segregation of the materials including the electrically conductive base metal material does not occur at portions sandwiched between adjacent positive and negative electrode layers among the dielectric ceramic layers.Type: GrantFiled: December 28, 2001Date of Patent: February 10, 2004Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Hitoshi Shindo, Etsuro Yasuda, Atsuhiro Sumiya, Takashi Yamamoto, Toshiatsu Nagaya
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Publication number: 20030188820Abstract: This invention provides a method for producing a stacked ceramic body that does not require strict control of an oxygen partial pressure in a sintering gas. To produce a stacked ceramic body by alternately stacking dielectric layer and electrode layers, an unsintered stacked body 2 is prepared by alternately stacking unsintered dielectric layers containing a PZT type dielectric material and unsintered electrode layers containing an electrode material, and is sintered in a sintering gas to which a dielectric layer anti-reducing agent 21 and an electrode layer anti-oxidant 22 are introduced. Alternatively, sintering is conducted in a gas containing only the dielectric layer anti-reducing agent 21 or in a gas containing only the electrode layer anti-oxidant 22.Type: ApplicationFiled: April 3, 2003Publication date: October 9, 2003Inventors: Eturo Yasuda, Atsuhiro Sumiya, Hitoshi Shindo, Toshiatsu Nagaya, Takashi Yamamoto
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Publication number: 20030027432Abstract: It is an object of the present invention to manufacture large-sized laminated dielectrics of high quality which permit adjustment of the atmosphere during sintering process to be accomplished easily, and which can eliminate the problems such as expansion due to reaction with the atmosphere gas.Type: ApplicationFiled: August 1, 2002Publication date: February 6, 2003Inventors: Atsuhiro Sumiya, Eturo Yasuda, Hitoshi Shindo, Yasunori Suzuki, Takashi Yamamoto, Toshiatsu Nagaya, Noriaki Kihara
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Publication number: 20020160904Abstract: An object of the present invention is to make it possible to sinter a PZT dielectric ceramic material at a desired low temperature and to prevent deterioration of the performance of the base material.Type: ApplicationFiled: December 28, 2001Publication date: October 31, 2002Inventors: Atsuhiro Sumiya, Hitoshi Shindo, Eturo Yasuda, Takumi Kataoka, Toshiatsu Nagaya, Akira Fujii, Takashi Yamamoto
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Publication number: 20020149297Abstract: A piezoelectric element having a structure capable of suppressing deformation during the fabrication thereof is disclosed. The piezoelectric element comprises a drive portion 101 including a plurality of ceramic layers 11 of a piezoelectric ceramic, a plurality of internal electrode layers 2 formed of a base metal as a main component for supplying electricity to the ceramic layers 11, and a dummy portion 103 formed at least on one end surface of the ceramic layers 11 of the drive portion 101 along the direction of stacking thereof, the ceramic layers 11 and the internal electrode layers 2 being stacked alternately. The dummy portion 103 is composed of ceramic and has at least one dummy electrode layer 3 of the same material as the internal electrode layers 2.Type: ApplicationFiled: April 11, 2002Publication date: October 17, 2002Inventors: Takashi Yamamoto, Atsuhiro Sumiya, Hitoshi Shindo, Eturo Yasuda, Shigehiko Sugiura
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Publication number: 20020149901Abstract: This invention relates to a laminate type dielectric device capable of sufficiently bonding an electrode material such as Cu to a ceramic material by using an economical base metal material such as Cu, and fully exploiting the characteristics of a dielectric ceramic layer, a production method thereof, and an electrode paste material.Type: ApplicationFiled: December 28, 2001Publication date: October 17, 2002Inventors: Hitoshi Shindo, Etsuro Yasuda, Atsuhiro Sumiya, Takashi Yamamoto, Toshiatsu Nagaya
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Publication number: 20020150508Abstract: An integrally fired, laminated electromechanical transducing element, fabricated using an inexpensive electrode material and having the electrode characteristic at least equivalent to that of the Ag—Pd electrode, is disclosed. Especially, in the integrally fired, laminated electromechanical transducing element according to the invention, (A) the rigidity of the internal electrode layers is low and the internal stress generated at the time of expansion or contraction of the ceramic layers is small, (B) the antimigration characteristic is superior, (C) the charge loss is small, the heat conductivity is high and the heat radiation characteristic is superior, and/or (D) the bonding strength between the ceramic layers and the electrode layers is high.Type: ApplicationFiled: December 28, 2001Publication date: October 17, 2002Inventors: Toshiatsu Nagaya, Youta Iwamoto, Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda
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Publication number: 20020121329Abstract: This invention provides a method of producing a laminate type dielectric device free from peeling of an electrode layer and a ceramic layer and from voids in both electrode layer and ceramic layer, and an electrode paste material. The invention relates also to an electrode paste material for constituting electrode layers of a laminate type dielectric device produced by at least the steps of alternately laminating ceramic layers 11 containing a lead element as a constituent component and electrode layers 2, and degreasing and baking the laminate, wherein the electrode paste material contains CuO as a principal component of a starting material of an electrically conductive material, a solvent, a binder, and a cooperative material consisting of at least one kind of the main components constituting the ceramic layer 11.Type: ApplicationFiled: December 28, 2001Publication date: September 5, 2002Inventors: Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda, Takashi Yamamoto, Toshiatsu Nagaya
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Publication number: 20020027215Abstract: A piezoelectric material exhibiting a high Curie point and a high displacement at a low drive voltage is provided. The piezoelectric material contains as a main component a composite oxide and is expressed by the general formula [Pb{1−x1−x2−&agr;(x1−x2)}, A1x1, A2x2]{(Tiy, Zrz) (1−&bgr;(x1−x2)−&ggr;), (Y0.5, Nb0.5)&ggr;}O3, where y +z=1, 1.15 <z/y<1.30 and 0<&ggr;<0.1; and A1, A2, x1, x2 satisfy any of the conditions (i) A1 is at least selected one of Ce and La, A2 is K, 0.02≦x1<0.08, 0≦x2≦0.05 (0.02≦x1+x2≦0.1, x1≦x2) and &agr;=0, &bgr;=0.25 or &agr;=0.5, &bgr;=0, and (ii) A1 is Sr, A2 is Ba, 0.03 ≦x1≦0.05, 0.03≦x2≦0.05 (|x1−x2|≦0.01), and &agr;=0, &bgr;=0.Type: ApplicationFiled: May 10, 2001Publication date: March 7, 2002Inventors: Hitoshi Shindo, Atsuhiro Sumiya, Eturo Yasuda, Takashi Yamamoto