Patents by Inventor Toshiatsu Nagaya
Toshiatsu Nagaya 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: 8004161Abstract: A multilayered piezoelectric element and a method of producing the multilayered piezoelectric element are disclosed. The multilayered piezoelectric element is made of piezoelectric ceramic layers and electrode formation layers which are alternately laminated. The piezoelectric ceramic layers are made of crystal oriented ceramic as polycrystalline material. The crystal oriented ceramic is made mainly of an isotropic perovskite type compound in which the specific {100} crystal plane of each of crystal grains that form the polycrystalline material is oriented. The electrode formation layers have electrode parts forming inner electrodes containing a conductive metal. The isotropic perovskite type compound is expressed by a general formula (1): [Agh{Lix(K1-yNay)1-x}1-h]j(Nb1-z-wTazSbw)O3-k ??(1), where 0?x?0.2, 0?y?1, 0?z?0.4, 0?w?0.2, x+z+w>0, 0<h?0.05, 0.94?j?1, and 0?k?0.5).Type: GrantFiled: May 29, 2009Date of Patent: August 23, 2011Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Toshiatsu Nagaya, Kouji Noda, Masatoshi Ikeda, Masaya Nakamura, Daisuke Shibata
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Publication number: 20090295255Abstract: A multilayered piezoelectric element and a method of producing the multilayered piezoelectric element are disclosed. The multilayered piezoelectric element is made of piezoelectric ceramic layers and electrode formation layers which are alternately laminated. The piezoelectric ceramic layers are made of crystal oriented ceramic as polycrystalline material. The crystal oriented ceramic is made mainly of an isotropic perovskite type compound in which the specific {100} crystal plane of each of crystal grains that form the polycrystalline material is oriented. The electrode formation layers have electrode parts forming inner electrodes containing a conductive metal. The isotropic perovskite type compound is expressed by a general formula (1): [Agh{Lix(K1-yNay)1-x}1-h]j(Nb1-z-wTazSbw)O3-k . . . (1), where 0?x?0.2, 0?y?1, 0?z?0.4, 0?w?0.2, x+z+w>0, 0<h?0.05, 0.94?j?1, and 0?k?0.5).Type: ApplicationFiled: May 29, 2009Publication date: December 3, 2009Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Toshiatsu NAGAYA, Kouji Noda, Masatoshi Ikeda, Masaya Nakamura, Daisuke Shibata
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Publication number: 20090242099Abstract: A method of producing a piezostack device including multiple piezoelectric ceramic layers of a crystal-orientated ceramic and multiple electrode-containing layers laminated alternately. A raw material mixture is prepared in the mixing step, as an anisotropically shaped powder of oriented particles and a reactive raw powder are mixed. The anisotropically shaped powder and the reactive raw powder are then mixed in amounts at a stoichiometric ratio giving an isotropic perovskite compound, and a Nb2O5 powder and/or a Ta2O5 powder were added thereto. The raw material mixture is molded into a sheet shape in the sheet-forming step, while the crystal faces of the anisotropically shaped powder particles are almost oriented. An electrode material is printed on the green sheet in the printing step. The green sheets obtained after the printing step are laminated in the laminating step. The composite thus obtained is sintered in the sintering step, to give a piezostack device.Type: ApplicationFiled: March 31, 2009Publication date: October 1, 2009Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Toshiatsu NAGAYA, Masaya Nakamura, Daisuke Shibata, Kouji Noda, Masatoshi Ikeda
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Publication number: 20090121374Abstract: A method of manufacturing a crystal oriented ceramics is disclosed. The method comprises preparing step, mixing step, shaping step and sintering method. At least one of anisotropically shaped powder, used as raw material, and a compact, formed by shaping step, is selected to have an orientation degree of 80% or more with a full width at half maximum (FWHM) of 15° or less according to a rocking curve method. A microscopic powder, having an average grain diameter one-third or less that of anisotropically shaped powder, is prepared for mixing therewith to prepare raw material mixture. The raw material mixture is shaped into the compact so as to allow oriented planes of anisotropically shaped powder to be oriented in a nearly identical direction. In a sintering step, anisotropically shaped powder and microscopic powder are sintered with each other to obtain the crystal oriented ceramics.Type: ApplicationFiled: October 29, 2008Publication date: May 14, 2009Applicant: DENSO CORPORATIONInventors: Daisuke Shibata, Masaya Nakamura, Hideki Kimura, Toshiatsu Nagaya, Hirotaka Yamaguchi
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Patent number: 7531947Abstract: A stacked piezoelectric element obtained by alternately stacking a piezoelectric ceramic layer and an electrode layer, wherein said electrode layer mainly comprises an electrically conducting base metal electrode material, and the region held between the electrode layer positioned at the top of each ceramic layer and the electrode layer positioned at the bottom of each ceramic layer contains a material having no piezoelectricity, in which a constituent element of said material having no piezoelectricity is uniformly dispersed so as not to have local distribution of a distributed strength exceeding 2 times the distributed strength which is distributed in a largest number of places and is not 0.Type: GrantFiled: September 7, 2005Date of Patent: May 12, 2009Assignees: Nippon Soken, Inc., Denso CorporationInventors: Hitoshi Shindo, Eturo Yasuda, Masatoshi Ikeda, Masaya Nakamura, Tatsuhiko Nonoyama, Toshiatsu Nagaya
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Patent number: 7470390Abstract: To provide a production method of a polycrystalline ceramic body with excellent density, a preparation step, a mixing step, a forming step and a heat-treating step are performed. In the preparation step, a coarse particle ceramic powder, and a fine particle powder having an average particle diameter of ? or less of the average particle diameter of the coarse particle ceramic powder are prepared. In the mixing step, the coarse particle ceramic powder and the fine particle powder are mixed to produce a raw material mixture. In the forming step, the raw material mixture is formed to a shaped body. In the heat-treating step, the shaped body is heated and thereby sintered to produce a polycrystalline ceramic body. In the heat-treating step, a temperature elevating process and a first holding process are performed and at the same time, a second holding process and/or a cooling process are performed.Type: GrantFiled: October 25, 2005Date of Patent: December 30, 2008Assignee: Denso CorporationInventors: Masaya Nakamura, Toshiatsu Nagaya, Tatsuhiko Nonoyama, Hisaaki Takao, Yasuyoshi Saito, Takahiko Homma, Kazumasa Takatori
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Patent number: 7443085Abstract: A piezoelectric actuator 1 includes a piezoelectric element 2, which has a pair of electrodes formed on the surface of a piezoelectric ceramic member, as a drive source. The piezoelectric actuator 1 satisfies at least one of the following requirements (a) to (c): (a) the variation width WC in an apparent dynamic capacity C [F] due to a change in temperature should fall within ±11% over a specific temperature range from ?30° C. to 80° C.; (b) the variation width WL in a displacement L [?m] due to a change in temperature should fall within ±14% over the specific temperature range from ?30° C. to 80° C.; and (c) the variation width WL/C in a quotient L/C due to a change in temperature should fall within ±12% over the specific temperature range from ?30° C. to 80° C., wherein C [F] denotes the apparent dynamic capacity and L [?m] denotes the displacement.Type: GrantFiled: March 13, 2007Date of Patent: October 28, 2008Assignee: Denso CorporationInventors: Toshiatsu Nagaya, Tatsuhiko Nonoyama, Masaya Nakamura, Yasuyoshi Saito, Hisaaki Takao, Takahiko Homma, Kazumasa Takatori
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Patent number: 7352113Abstract: The piezoelectric actuator includes a piezoelectric element (2) including a sheet of piezoelectric ceramic and electrodes formed at least part of the surface of the sheet of piezoelectric ceramic, and a holding member (4) holding the piezoelectric element (2); The piezoelectric at least one of the requirements (a) to (e) described below; (a) The bulk density shall be equal to or smaller than 5 g/cm3, and the Young's modulus Y11E calculated according to a resonance-antiresonance method shall be equal to or larger than 90 GPa; (b) The coefficient of thermal conductivity shall be equal to or larger than 2 Wm?1K?1; (c) The coefficient of thermal expansion shall be equal to or larger than 3.0 ppm/° C. over a temperature range from ?30° C. to 160° C.; (d) The pyroelectric coefficient shall be equal to or smaller than 400 ?Cm?2K?1 over the temperature range from ?30° C. to 160° C.Type: GrantFiled: March 13, 2007Date of Patent: April 1, 2008Assignee: DENSO CorporationInventors: Toshiatsu Nagaya, Tatsuhiko Nonoyama, Masaya Nakamura, Yasuyoshi Saito, Hisaaki Takao, Takahiko Homma, Kazumasa Takatori
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Publication number: 20080066496Abstract: An anisotropically shaped powder composed of oriented grains with a specific crystal plane {100} of each crystal grain being oriented, a related manufacturing method and a method of manufacturing a crystal oriented ceramics using such an anisotropically shaped powder are disclosed. The anisotropically shaped powder includes a principal component of an isotropic perovskite-based pentavalent metal acid alkali compound represented by a general formula (1): (KaNa1?a)(Nb1?bTab)O3 (wherein 0?a?0.8 and 0.02?b?0.4). In manufacturing the anisotropically shaped powder, a bismuth-layer-like perovskite-based compound of a specific composition is acid treated; a source of K or the like is added to the resulting acid-treated substance; and the resulting mixture is heated.Type: ApplicationFiled: August 23, 2007Publication date: March 20, 2008Applicant: DENSO CORPORATIONInventors: Toshiatsu Nagaya, Masaya Nakamura, Tatsuhiko Nonoyama, Daisuke Shibata, Hisaaki Takao, Yasuyoshi Saito
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Publication number: 20070228874Abstract: A piezoelectric actuator 1 includes a piezoelectric element 2, which has a pair of electrodes formed on the surface of a piezoelectric ceramic member, as a drive source. The piezoelectric actuator 1 satisfies at least one of the following requirements (a) to (c): (a) the variation width WC in an apparent dynamic capacity C [F] due to a change in temperature should fall within ±11% over a specific temperature range from ?30° C. to 80° C.; (b) the variation width WL in a displacement L [?m] due to a change in temperature should fall within ±14% over the specific temperature range from ?30° C. to 80° C.; and (c) the variation width WL/C in a quotient L/C due to a change in temperature should fall within ±12% over the specific temperature range from ?30° C. to 80° C., wherein C [F] denotes the apparent dynamic capacity and L [?m] denotes the displacement.Type: ApplicationFiled: March 13, 2007Publication date: October 4, 2007Applicant: DENSO CorporationInventors: Toshiatsu Nagaya, Tatsuhiko Nonoyama, Masaya Nakamura, Yasuyoshi Saito, Hisaaki Takao, Takahiko Homma, Kazumasa Takatori
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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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Patent number: 7267783Abstract: This invention provides a piezoelectric ceramic composition that does not contain lead, can be sintered at a normal pressure and is excellent in at least one of a piezoelectric constant, an electro-mechanical coupling coefficient, a dielectric loss, a relative dielectric constant and a Curie point, its production method, and a piezoelectric device and a dielectric device each utilizing the piezoelectric ceramic composition. The invention relates to a piezoelectric composition expressed by the general formula {Lix(K1?yNay)1?x}(Nb1?zSbz)O3, each of x, y and z respectively falling within composition ranges of 0?x?0.2, 0?y?1.0 and 0?z?0.2 (with the exception of x=z=0), and its production method. The invention further relates to a piezoelectric device having a piezoelectric body formed of the piezoelectric ceramic composition described above and a dielectric device having a dielectric body formed of the piezoelectric ceramic composition described above.Type: GrantFiled: March 19, 2003Date of Patent: September 11, 2007Assignee: DENSO CORPORATIONInventors: Tatsuhiko Nonoyama, Toshiatsu Nagaya, Yasuyoshi Saito, Kazumasa Takatori, Takahiko Homma, Hisaaki Takao
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Publication number: 20070176516Abstract: A piezoelectric sensor capable of preventing fluctuation in the sensitivity of the piezoelectric sensor over a wide temperature range is provided. This is a piezoelectric sensor comprising a piezoelectric element and a holding member for holding the piezoelectric element, the piezoelectric element comprising a piezoelectric ceramic having formed on the surfaces thereof a pair of electrodes. The piezoelectric ceramic satisfies the following requirement (a) and/or requirement (b): (a) in the temperature range from ?30° C. to 160° C., the thermal expansion coefficient is 3.0 ppm/° C. or more, and (b) in the temperature range from ?30° C. to 160° C., the pyroelectric coefficient is 400 ?Cm?2K?1 or less.Type: ApplicationFiled: March 8, 2007Publication date: August 2, 2007Applicant: Denso CorporationInventors: Toshiatsu Nagaya, Tatsuhiko Nonoyama, Masaya Nakamura, Yasuyoshi Saito, Hisaaki Takao, Takahiko Homma, Kazumasa Takatori
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Publication number: 20070159028Abstract: The present invention provides a piezoelectric actuator that enjoys excellent practicality. The piezoelectric actuator includes a piezoelectric element (2) including a sheet of piezoelectric ceramic and electrodes formed at least part of the surface of the sheet of piezoelectric ceramic, and a holding member (4) holding the piezoelectric element (2). The piezoelectric at least one of the requirements (a) to (e) described below. (a) The bulk density shall be equal to or smaller than 5 g/cm3, and the Young's modulus Y11E calculated according to a resonance-antiresonance method shall be equal to or larger than 90 GPa. (b) The coefficient of thermal conductivity shall be equal to or larger than 2 Wm?1K?1. (c) The coefficient of thermal expansion shall be equal to or larger than 3.0 ppm/° C. over a temperature range from ?30° C. to 160° C. (d) The pyroelectric coefficient shall be equal to or smaller than 400 ?Cm?2K?1 over the temperature range from ?30° C. to 160° C.Type: ApplicationFiled: March 13, 2007Publication date: July 12, 2007Applicant: DENSO CORPORATIONInventors: Toshiatsu Nagaya, Tatsuhiko Nonoyama, Masaya Nakamura, Yasuyoshi Saito, Hisaaki Takao, Takahiko Homma, Kazumasa Takatori
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Patent number: 7150838Abstract: This invention provides a piezoelectric ceramic composition that does not contain lead, can be sintered at a normal pressure and has a high electro-mechanical coupling coefficient and a small dielectric loss, its production method, and a piezoelectric device utilizing the piezoelectric ceramic composition. The invention relates to a piezoelectric composition containing a compound expressed by the general formula {Lix(K1-yNay)1-x}(Nb1-zTaz)O3, each of x, y and z respectively falling within composition range of 0?x?0.2, 0?y?1.0 and 0?z?0.4, as its main component, and further containing nickel or a nickel-containing compound. To provide a piezoelectric device that does not contain lead, can be sintered at a normal pressure and has a high electro-mechanical coupling coefficient Kp and a small dielectric loss, the piezoelectric ceramic composition of the invention is expressed by the general formula {Lix(K1-yNay)1-x}(Nb1-z-nTaz(Mn0.5W0.Type: GrantFiled: March 19, 2003Date of Patent: December 19, 2006Assignee: Denso CorporationInventors: Tatsuhiko Nonoyama, Toshiatsu Nagaya, Yasuyoshi Saito, Kazumasa Takatori, Hisaaki Takao, Takahiko Homma
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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: 7101491Abstract: A piezoelectric ceramic composition not containing lead, able to be sintered at ordinary pressure, and superior to the past in at least one of the properties unique to piezoelectric ceramic compositions such as the piezoelectric d31 constant, that is, a piezoelectric ceramic composition having a compound of a general formula {Lix(K1-yNay)1-x}(Nb1-z-wTazSbw)O3 where x, y, z, and w are in the ranges of 0?x?0.2, 0?y?1, 0<z?0.4, and 0<w?0.2 as a main ingredient, where the piezoelectric ceramic composition contains at least one metal element selected from (1) palladium, silver, gold, ruthenium, rhodium, rhenium, osmium, iridium, and platinum, (2) nickel, iron, manganese, copper, and zinc, or (3) magnesium, calcium, strontium, and barium as an added element, and a method of production of the same and a piezoelectric element and dielectric element utilizing that piezoelectric ceramic composition.Type: GrantFiled: July 16, 2003Date of Patent: September 5, 2006Assignees: DENSO Corporation, Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Tatsuhiko Nonoyama, Toshiatsu Nagaya, Yasuyoshi Saito, Kazumasa Takatori, Hisaaki Takao, Takahiko Homma
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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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Publication number: 20060091588Abstract: To provide a production method of a polycrystalline ceramic body with excellent density, a preparation step, a mixing step, a forming step and a heat-treating step are performed. In the preparation step, a coarse particle ceramic powder, and a fine particle powder having an average particle diameter of ? or less of the average particle diameter of the coarse particle ceramic powder are prepared. In the mixing step, the coarse particle ceramic powder and the fine particle powder are mixed to produce a raw material mixture. In the forming step, the raw material mixture is formed to a shaped body. In the heat-treating step, the shaped body is heated and thereby sintered to produce a polycrystalline ceramic body. In the heat-treating step, a temperature elevating process and a first holding process are performed and at the same time, a second holding process and/or a cooling process are performed.Type: ApplicationFiled: October 25, 2005Publication date: May 4, 2006Applicant: DENSO CorporationInventors: Masaya Nakamura, Toshiatsu Nagaya, Tatsuhiko Nonoyama, Hisaaki Takao, Yasuyoshi Saito, Takahiko Homma, Kazumasa Takatori