Patents by Inventor Atsuo Nagai
Atsuo Nagai 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: 10777359Abstract: A multilayer ceramic capacitor and a manufacturing method thereof are disclosed. The multilayer ceramic capacitor includes a base part including ceramic dielectrics, and inner electrodes formed in the ceramic dielectrics and arranged in interval by a staggered manner; two first outer electrodes of outer electrode layers are sintered and formed on two sides of the base part, and in electrical contact with the inner electrode terminals of the inner electrodes. Second outer electrodes are formed on outer parts of the two first outer electrodes. The inner electrodes and the first outer electrodes have barium titanate powder and nickel powder with average particle diameters in range of 0.2 ?m to 0.4 ?m, so that the inner electrodes are in good electrical contact with the first outer electrodes, to improve binding strength and reduce peeling of the first outer electrodes from the inner electrodes.Type: GrantFiled: January 24, 2020Date of Patent: September 15, 2020Assignee: Holy Stone Enterprise Co., Ltd.Inventors: Atsuo Nagai, Keisuke Seino, Sheng-Yi Chen
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Publication number: 20200161055Abstract: A multilayer ceramic capacitor and a manufacturing method thereof are disclosed. The multilayer ceramic capacitor includes a base part including ceramic dielectrics, and inner electrodes formed in the ceramic dielectrics and arranged in interval by a staggered manner; two first outer electrodes of outer electrode layers are sintered and formed on two sides of the base part, and in electrical contact with the inner electrode terminals of the inner electrodes. Second outer electrodes are formed on outer parts of the two first outer electrodes. The inner electrodes and the first outer electrodes have barium titanate powder and nickel powder with average particle diameters in range of 0.2 ?m to 0.4 ?m, so that the inner electrodes are in good electrical contact with the first outer electrodes, to improve binding strength and reduce peeling of the first outer electrodes from the inner electrodes.Type: ApplicationFiled: January 24, 2020Publication date: May 21, 2020Inventors: Atsuo NAGAI, Keisuke SEINO, Sheng-Yi CHEN
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Patent number: 10593481Abstract: A multilayer ceramic capacitor and a method of manufacturing the same are disclosed. A base part of the multilayer ceramic capacitor includes ceramic dielectric and inner electrodes formed inside the ceramic dielectric, and a terminal of each of the inner electrodes is exposed out of one of the two opposite sides of the base part, to form inner electrode terminals. First outer electrodes are formed on the two sides of the base part and the outside of the inner electrode terminals, and second outer electrodes are formed on the first outer electrodes. The first outer electrodes and the base part are formed together by sintering manner, and the second outer electrodes are formed by metal powder and resin material, thereby solving the problem that the vitreous component diffuses around, or solving the problem that plating solution permeates into the base part or the ceramic dielectric during plating process.Type: GrantFiled: January 29, 2019Date of Patent: March 17, 2020Assignee: HOLY STONE ENTERPRISE CO., LTD.Inventors: Atsuo Nagai, Sheng-Yi Chen
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Publication number: 20190172647Abstract: A multilayer ceramic capacitor and a method of manufacturing the same are disclosed. A base part of the multilayer ceramic capacitor includes ceramic dielectric and inner electrodes formed inside the ceramic dielectric, and a terminal of each of the inner electrodes is exposed out of one of the two opposite sides of the base part, to form inner electrode terminals. First outer electrodes are formed on the two sides of the base part and the outside of the inner electrode terminals, and second outer electrodes are formed on the first outer electrodes. The first outer electrodes and the base part are formed together by sintering manner, and the second outer electrodes are formed by metal powder and resin material, thereby solving the problem that the vitreous component diffuses around, or solving the problem that plating solution permeates into the base part or the ceramic dielectric during plating process.Type: ApplicationFiled: January 29, 2019Publication date: June 6, 2019Inventors: Atsuo NAGAI, Sheng-Yi CHEN
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Patent number: 10217568Abstract: A multilayer ceramic capacitor and a method of manufacturing the same are disclosed. A base part of the multilayer ceramic capacitor includes ceramic dielectric and inner electrodes formed inside the ceramic dielectric, and a terminal of each of the inner electrodes is exposed out of one of the two opposite sides of the base part, to form inner electrode terminals. First outer electrodes are formed on the two sides of the base part and the outside of the inner electrode terminals, and second outer electrodes are formed on the first outer electrodes. The first outer electrodes and the base part are formed together by sintering manner, and the second outer electrodes are formed by metal powder and resin material, thereby solving the problem that the vitreous component diffuses around, or solving the problem that plating solution permeates into the base part or the ceramic dielectric during plating process.Type: GrantFiled: January 25, 2018Date of Patent: February 26, 2019Assignee: HOLY STONE ENTERPRISE CO., LTD.Inventors: Atsuo Nagai, Sheng-Yi Chen
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Publication number: 20180233289Abstract: A multilayer ceramic capacitor and a method of manufacturing the same are disclosed. A base part of the multilayer ceramic capacitor includes ceramic dielectric and inner electrodes formed inside the ceramic dielectric, and a terminal of each of the inner electrodes is exposed out of one of the two opposite sides of the base part, to form inner electrode terminals. First outer electrodes are formed on the two sides of the base part and the outside of the inner electrode terminals, and second outer electrodes are formed on the first outer electrodes. The first outer electrodes and the base part are formed together by sintering manner, and the second outer electrodes are formed by metal powder and resin material, thereby solving the problem that the vitreous component diffuses around, or solving the problem that plating solution permeates into the base part or the ceramic dielectric during plating process.Type: ApplicationFiled: January 25, 2018Publication date: August 16, 2018Inventors: Atsuo Nagai, Sheng-Yi CHEN
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Patent number: 7786036Abstract: A dielectric ceramic composition containing at least 0.15 to 2.5 mol of a Mg compound in terms of MgO, 0 to 1.6 mol of a Ba compound in terms of BaCO3, 0.1 to 3.0 mol of a Ln (Ln includes two or three kinds of elements selected from Er, Dy, and Ho with Er being essential) compound in terms of Ln2O3, 0.01 to 0.4 mol of a Mn compound in terms of MnO4/3, 0.01 to 0.26 mol of a V compound in terms of V2O5, 0.3 to 3.5 mol of a Si compound in terms of SiO2, and 0.01 to 2.5 mol of an Al compound in terms of Al2O3 to 100 mol of barium titanate adjusted for a Ba/Ti molar ratio of 0.997 to 1.007.Type: GrantFiled: March 24, 2006Date of Patent: August 31, 2010Assignee: Panasonic CorporationInventors: Kazuhiro Komatsu, Kazuki Hirata, Atsuo Nagai, Tadashi Onomi, Kenji Oka
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Patent number: 7605051Abstract: A method for forming an internal electrode pattern having a predetermined shape includes the following: a step of forming a conductive layer by applying a metal paste on a first support, the metal paste containing metal powder and a binder; a step of forming a resin layer on a second support, the resin layer having a pattern negative to the internal electrode pattern; a step of compression bonding the first support and the second support to each other in such a manner that the conductive layer and the resin layer are opposite to each other; and a step of removing the second support from the first support so as to transfer a conductive layer to the second support, the conductive layer having the pattern negative to the internal electrode pattern, thereby forming the internal electrode pattern having the predetermined shape on the first support.Type: GrantFiled: March 22, 2006Date of Patent: October 20, 2009Assignee: Panasonic CorporationInventors: Fuyuki Abe, Shinya Okumura, Takahiko Tsujimura, Kengo Nakamura, Atsuo Nagai
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Patent number: 7470291Abstract: At least one conductive layer is formed by applying paste mainly containing metal on at least one insulating sheet. At least one sintered body is provided by firing the at least one insulating sheet having the at least one conductive layer formed thereon. The amount of the metal contained in the at least one conductive layer of the at least one sintered body is detected. A sintered body is selected from the at least one sintered body based on the detected amount of the metal. An outer electrode is formed on the selected sintered body, thus providing a ceramic electronic device. This method allows a defective to be detected in an early stage of manufacturing processes, hence providing a ceramic electronic device to be manufactured efficiently.Type: GrantFiled: July 13, 2004Date of Patent: December 30, 2008Assignee: Panasonic CorporationInventors: Jun Otsuki, Atsuo Nagai
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Publication number: 20080316676Abstract: Material powder having a tetragonal perovskite crystal structure essentially containing BaTiO3 is provided. The material powder has a c-axis/a-axis ratio ranging from 1.009 to 1.011 and an average particle diameter not larger than 0.5 ?m. A dielectric layer is provided by mixing the material powder with additive. The dielectric layer has a tetragonal perovskite crystal structure essentially containing BaTiO3. The dielectric layer has a c-axis/a-axis ratio ranging from 1.005 to 1.009 and an average particle diameter not larger than 0.5 ?m. An electrode is formed on the dielectric layer, thus, providing a ceramic capacitor. This ceramic capacitor has a large capacitance and a small capacitance-decreasing rate.Type: ApplicationFiled: September 7, 2005Publication date: December 25, 2008Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Hiroki Moriwake, Kazuki Hirata, Atsuo Nagai, Kazuhiro Komatsu
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Publication number: 20080127469Abstract: A method for forming an internal electrode pattern having a predetermined shape includes the following: a step of forming a conductive layer (12) by applying a metal paste on a first support (20), the metal paste containing metal powder and a binder; a step of forming a resin layer (13) on a second support (30), the resin layer having a pattern negative to the internal electrode pattern; a step of compression bonding the first support (20) and the second support (30) to each other in such a manner that the conductive layer (12) and the resin layer (13) are opposite to each other; and a step of removing the second support (30) from the first support (20) so as to transfer a conductive layer (121) to the second support (30), the conductive layer having the pattern negative to the internal electrode pattern, thereby forming the internal electrode pattern (14) having the predetermined shape on the first support (20).Type: ApplicationFiled: March 22, 2006Publication date: June 5, 2008Inventors: Fuyuki Abe, Shinya Okumura, Takahiko Tsujimura, Kengo Nakamura, Atsuo Nagai
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Publication number: 20080115876Abstract: A dielectric ceramic composition containing at least 0.15 to 2.5 mol of a Mg compound in terms of MgO, 0 to 1.6 mol of a Ba compound in terms of BaCO3, 0.1 to 3.0 mol of a Ln (Ln includes two or three kinds of elements selected from Er, Dy, and Ho with Er being essential) compound in terms of Ln2O3, 0.01 to 0.4 mol of a Mn compound in terms of MnO4/3, 0.01 to 0.26 mol of a V compound in terms of V2O5, 0.3 to 3.5 mol of a Si compound in terms of SiO2, and 0.01 to 2.5 mol of an Al compound in terms of Al2O3 to 100 mol of barium titanate adjusted for a Ba/Ti molar ratio of 0.997 to 1.007.Type: ApplicationFiled: March 24, 2006Publication date: May 22, 2008Inventors: Kazuhiro Komatsu, Kazuki Hirata, Atsuo Nagai, Tadashi Onomi, Kenji Oka
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Patent number: 7335328Abstract: A method of manufacturing a multilayer ceramic capacitor includes the steps of: preparing a mixture of a raw material powder mainly composed of barium titanate particles; forming the mixture and a binder into a green sheet; alternately layering the green sheet and an internal electrode to obtain a laminated body; and sintering the laminated body. The step of preparing the mixture includes the steps of: introducing the raw material powder and the dispersion medium into a mixing container, and stirring them with balls serving as a mixing medium, to obtain a slurry containing a raw material powder mixture; and drying the slurry. The mixing medium has a diameter that is equal to or less than 400 times the mean particle size of the barium titanate particles of the raw material. The present invention provides a multilayer ceramic capacitor having good DC bias characteristics by suppressing the variation in crystal particles.Type: GrantFiled: October 24, 2003Date of Patent: February 26, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuki Hirata, Kenji Oka, Kazuhiro Komatsu, Atsuo Nagai
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Publication number: 20060205210Abstract: At least one conductive layer is formed by applying paste mainly containing metal on at least one insulating sheet. At least one sintered body is provided by firing the at least one insulating sheet having the at least one conductive layer formed thereon. The amount of the metal contained in the at least one conductive layer of the at least one sintered body is detected. A sintered body is selected from the at least one sintered body based on the detected amount of the metal. An outer electrode is formed on the selected sintered body, thus providing a ceramic electronic device. This method allows a defective to be detected in an early stage of manufacturing processes, hence providing a ceramic electronic device to be manufactured efficiently.Type: ApplicationFiled: July 13, 2004Publication date: September 14, 2006Inventors: Jun Otsuki, Atsuo Nagai
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Patent number: 7049679Abstract: A solid electrolytic capacitor is obtained in which a sintered metal serves as an anode and a silver layer serves as a cathode. A surface of sintered metal made of tantalum or the like and having an open porosity ratio of more than 75% is oxidized so that an oxide film made of tantalum pentoxide or the like is deposited thereon. Cavities of the metal are filled with an electrically conductive material. Then, the metal is wound around a lead wire and made into a desired shape and size. The silver layer is formed on this porous metal body. Because a specific surface area of the sintered metal is large, a large capacity is obtained.Type: GrantFiled: November 1, 2002Date of Patent: May 23, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Atsuo Nagai, Hideki Kuramitsu, Emiko Igaki, Koichi Kojima
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Patent number: 7042706Abstract: A multilayer ceramic electronic component includes a laminate having ceramic layers and internal electrodes stacked alternately one on another, and at least one kind of metal oxide between respective one of the ceramic layers and corresponding one of the internal electrodes. A method of manufacturing a multilayer ceramic electronic component includes a first step of stacking ceramic sheets and metal layers alternately one on another to fabricate a laminate and a second step of firing the laminate. Respective one of the metal layers has, on the surface of a sheet-like first metal, a second metal more susceptible to oxidation than the first metal. The second step is performed at an oxygen partial pressure at which the first metal is hardly oxidized and the second metal is oxidized.Type: GrantFiled: October 22, 2002Date of Patent: May 9, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Atsuo Nagai, Jun Otsuki, Hideki Kuramitsu
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Patent number: 7014725Abstract: A first step of alternately stacking a ceramic sheet and an internal electrode with an adhesive layer between the ceramic sheet and the internal electrode to obtain a laminated body, and a second step of sintering the laminated body are provided. The adhesive layer includes a thermoplastic resin and at least one of Cr, Mg, Al, Si, a Cr compound, an Mg compound, an Al compound, an Si compound and an inorganic powder included in the ceramic sheet. This manufacturing method improves adhesion between a ceramic layer and the internal electrode after sintering and suppresses a structural defect such as delamination or a crack.Type: GrantFiled: October 22, 2002Date of Patent: March 21, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Atsuo Nagai, Jun Otsuki, Hideki Kuramitsu, Keiji Kobayashi
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Patent number: 6954350Abstract: A ceramic layered product 10 includes a plurality of ceramic layers 12 including a metallic element and a plurality of metal layers 14a, 14b, each of which is arranged between the ceramic layers 12. The metallic layers 14a, 14b include at least one element selected from the group consisting of Ni, Cu, Ag, and Pd in a total content of not less than 50 atm % as a main component, and at least one element selected from the metallic elements of the ceramic layers 12 in a content of not less than 1 atm % and less than 50 atm % as an additive component. This ceramic layered product can be less susceptible to fracture in the metal layers caused by firing.Type: GrantFiled: September 16, 2003Date of Patent: October 11, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuyoshi Honda, Yoriko Takai, Atsuo Nagai, Masako Murao, Keiji Kobayashi
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Patent number: 6947276Abstract: The present invention relates to a method of manufacturing a multilayer ceramic capacitor, having the steps of: (a) alternately layering internal electrodes and ceramic green sheets containing a ceramic material having barium titanate to form a laminated body; (b) sintering the laminated body to obtain a sintered body; and (c) forming an external electrode on end faces of the sintered body to obtain a multilayer ceramic capacitor. The barium titanate has a diffraction line derived from (002) plane and a diffraction line derived from (200) plane in an X-ray diffraction chart. The ratio I(200)/Ib of peak intensity I(200) at 2?(200) to diffraction intensity Ib at a midpoint angle between peak angle 2?(002) of the diffraction line derived from the (002) plane and peak angle 2?(200) of the diffraction line derived from the (200) plane is 2 to 10. The product r·Sa of mean particle size r (?m) of the barium titanate and specific surface area Sa (m2/g) is 1 to 2.Type: GrantFiled: October 24, 2003Date of Patent: September 20, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuki Hirata, Kenji Oka, Kazuhiro Komatsu, Atsuo Nagai
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Patent number: D720791Type: GrantFiled: April 1, 2013Date of Patent: January 6, 2015Assignee: Sony CorporationInventor: Atsuo Nagai