Patents by Inventor Hisamitsu Shizuno
Hisamitsu Shizuno 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: 11424076Abstract: A multi-layer ceramic capacitor having a weight of 8 mg or more includes a capacitance forming unit and a protective unit. The capacitance forming unit includes internal electrodes that are laminated in a first direction and includes end portions, positions of the end portions in a second direction orthogonal to the first direction being aligned with one another within a range of 0.5 ?m in the second direction. The protective unit covers the capacitance forming unit in the first direction and the second direction and includes an outer surface, a shortest distance between the outer surface and the end portion of an outermost layer in the internal electrodes in the first direction exceeding 10 ?m.Type: GrantFiled: February 23, 2021Date of Patent: August 23, 2022Assignee: Taiyo Yuden Co., Ltd.Inventors: Yuto Yamato, Takayuki Hattori, Takashi Asai, Hisamitsu Shizuno, Keisuke Ishii
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Publication number: 20210183583Abstract: A multi-layer ceramic capacitor having a weight of 8 mg or more includes a capacitance forming unit and a protective unit. The capacitance forming unit includes internal electrodes that are laminated in a first direction and includes end portions, positions of the end portions in a second direction orthogonal to the first direction being aligned with one another within a range of 0.5 ?m in the second direction. The protective unit covers the capacitance forming unit in the first direction and the second direction and includes an outer surface, a shortest distance between the outer surface and the end portion of an outermost layer in the internal electrodes in the first direction exceeding 10 ?m.Type: ApplicationFiled: February 23, 2021Publication date: June 17, 2021Inventors: Yuto YAMATO, Takayuki HATTORI, Takashi ASAI, Hisamitsu SHIZUNO, Keisuke ISHII
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Patent number: 10964482Abstract: A multi-layer ceramic capacitor having a weight of 8 mg or more includes a capacitance forming unit and a protective unit. The capacitance forming unit includes internal electrodes that are laminated in a first direction and includes end portions, positions of the end portions in a second direction orthogonal to the first direction being aligned with one another within a range of 0.5 ?m in the second direction. The protective unit covers the capacitance forming unit in the first direction and the second direction and includes an outer surface, a shortest distance between the outer surface and the end portion of an outermost layer in the internal electrodes in the first direction exceeding 10 ?m.Type: GrantFiled: December 14, 2018Date of Patent: March 30, 2021Assignee: Taiyo Yuden Co., Ltd.Inventors: Yuto Yamato, Takayuki Hattori, Takashi Asai, Hisamitsu Shizuno, Keisuke Ishii
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Publication number: 20190189352Abstract: A multi-layer ceramic capacitor having a weight of 8 mg or more includes a capacitance forming unit and a protective unit. The capacitance forming unit includes internal electrodes that are laminated in a first direction and includes end portions, positions of the end portions in a second direction orthogonal to the first direction being aligned with one another within a range of 0.5 ?m in the second direction. The protective unit covers the capacitance forming unit in the first direction and the second direction and includes an outer surface, a shortest distance between the outer surface and the end portion of an outermost layer in the internal electrodes in the first direction exceeding 10 ?m.Type: ApplicationFiled: December 14, 2018Publication date: June 20, 2019Inventors: YUTO YAMATO, TAKAYUKI HATTORI, TAKASHI ASAI, HISAMITSU SHIZUNO, KEISUKE ISHII
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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: 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: 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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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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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: 6620754Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y), an oxide of Mg, one or more oxides selected from oxides of Mn, V and Cr, an oxide of Mo and/or W and SiO2 or a glass component including SiO2, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3, the amount of the oxide of Mg is 0.2 to 1.5 mol % in terms of MgO and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, and the amount of the oxide of Mo and/or W is 0.025 to 0.25 mol % in terms of MoO3 and WO3.Type: GrantFiled: June 29, 2001Date of Patent: September 16, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Youichi Mizuno, Hisamitsu Shizuno, Kenji Saito, Yasunobu Kawamoto
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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: 6524983Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y) and one or more oxides selected from oxides of Mn, V and Cr, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3 and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, wherein the ratio of Ba to Ti ranges between 0.970 and 1.030.Type: GrantFiled: June 29, 2001Date of Patent: February 25, 2003Assignee: Taiyo Yuden Co., Ltd.Inventors: Yasunobu Kawamoto, Koichiro Morita, Kenji Saito, Hisamitsu Shizuno
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Publication number: 20020049131Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y) and one or more oxides selected from oxides of Mn, V and Cr, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3 and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, wherein the ratio of Ba to Ti ranges between 0.970 and 1.030.Type: ApplicationFiled: June 29, 2001Publication date: April 25, 2002Inventors: Yasunobu Kawamoto, Koichiro Morita, Kenji Saito, Hisamitsu Shizuno
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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
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Publication number: 20020016247Abstract: The ceramic capacitor in accordance with the present invention is fabricated by employing a dielectric ceramic composition in forming dielectric layers thereof, wherein the dielectric ceramic composition contains an oxide of Ba and Ti, an oxide of Re (Re used herein represents one or more rare-earth elements selected from Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Y), an oxide of Mg, one or more oxides selected from oxides of Mn, V and Cr, an oxide of Mo and/or W and SiO2 or a glass component including SiO2, wherein the amount of the oxide of Ba and Ti is 100 mol % in terms of BaTiO3, the amount of the oxide of Re is 0.25 to 1.5 mol % in terms of Re2O3, the amount of the oxide of Mg is 0.2 to 1.5 mol % in terms of MgO and the amount of one or more oxides of Mn, V or Cr is 0.03 to 0.6 mol % in terms of Mn2O3, V2O5, Cr2O3, respectively, and the amount of the oxide of Mo and/or W is 0.025 to 0.25 mol % in terms of MoO3 and WO3.Type: ApplicationFiled: June 29, 2001Publication date: February 7, 2002Inventors: Youichi Mizuno, Hisamitsu Shizuno, Kenji Saito, Yasunobu Kawamoto
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Publication number: 20010055193Abstract: 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: February 15, 2001Publication date: December 27, 2001Applicant: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi
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Publication number: 20010036054Abstract: 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: ApplicationFiled: March 30, 2001Publication date: November 1, 2001Applicant: Taiyo Yuden Co., Ltd.Inventors: Hirokazu Chazono, Hisamitsu Shizuno, Hiroshi Kishi