Patents by Inventor Minoru Ryu
Minoru Ryu 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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Publication number: 20170365411Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within ±20% of an average of the concentrations of the base metal in the five regions, and the dielectric layer has a thickness of 0.6 ?m or less.Type: ApplicationFiled: March 13, 2017Publication date: December 21, 2017Inventors: Katsuya TANIGUCHI, Koichiro MORITA, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20170365405Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode that is coupled to one of the pair of external electrodes; a dielectric layer that is stacked on the first internal electrode and contains BaTiO3 and Ni; and a second internal electrode that is stacked on the dielectric layer, contains Ni, and is coupled to another one of the pair of external electrodes, wherein Ni is contained in five regions, which are equally divided region of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, and a Ni concentration in at least one of end regions located closest to the first internal electrode and the second internal electrode among the five regions is greater than a Ni concentration in a central region of the five regions by 10% or more.Type: ApplicationFiled: March 10, 2017Publication date: December 21, 2017Inventors: Yoshiki IWAZAKI, Katsuya TANIGUCHI, Minoru RYU, Koichiro MORITA
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Publication number: 20170365407Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions is within ±20% of an average of the concentrations of the base metal in the five regions, the five regions being obtained by dividing a region from a location 50 nm away from the first internal electrode of the dielectric layer to a location 50 nm away from the second internal electrode of the dielectric layer in a stacking direction between the first and second internal electrodes equally into five.Type: ApplicationFiled: March 13, 2017Publication date: December 21, 2017Inventors: Koichiro MORITA, Minoru RYU, Katsuya TANIGUCHI, Yoshiki IWAZAKI
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Publication number: 20170365412Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within ±20% of an average of the concentrations of the base metal in the five regions, and an average grain size in the dielectric layer is 200 nm or less.Type: ApplicationFiled: March 13, 2017Publication date: December 21, 2017Inventors: Katsuya TANIGUCHI, Koichiro MORITA, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20170365410Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the pair external electrodes, a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, being within ±20% of an average of the concentrations of the base metal in the five regions, an average grain number in the dielectric layer being three or less in the stacking direction between the first and second internal electrodes.Type: ApplicationFiled: March 13, 2017Publication date: December 21, 2017Inventors: Koichiro MORITA, Katsuya TANIGUCHI, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20170365408Abstract: A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the pair external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within ±20% of an average of the concentrations of the base metal in the five regions, and thicknesses of the first internal electrode and the second internal electrode are 0.2 ?m or greater.Type: ApplicationFiled: March 13, 2017Publication date: December 21, 2017Inventors: Koichiro MORITA, Katsuya TANIGUCHI, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20170345564Abstract: In an embodiment, a multilayer ceramic capacitor 10 has a first external electrode 12 and a second external electrode 13 that each contain metal grains MP and dielectric grains DP, where an oxide of the same metal element constituting the metal grain MP, or MO, is present at the interface between the metal grain MP and the dielectric grain DP. The multilayer ceramic capacitor can prevent the hardness of its external electrodes from dropping, even when the external electrodes contain metal grains and dielectric grains.Type: ApplicationFiled: May 19, 2017Publication date: November 30, 2017Inventors: Minoru RYU, Mikio TAHARA, Hirokazu ORIMO
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Publication number: 20170345567Abstract: In an embodiment, a multilayer ceramic capacitor 10 has a capacitor body comprising a capacitive part 11a constituted by multiple internal electrode layers 11al that are stacked with dielectric layers 11a2 in between, as well as dielectric cover parts 11b that respectively cover both sides of the capacitive part 11a in the stacking direction. Also, the dielectric layers 11a2 of the capacitive part 11a, and the dielectric cover parts 11b, contain elemental manganese, and the elemental manganese is distributed in such a way that its quantity gradually decreases in the depth direction from the exterior faces of the dielectric cover parts 11b toward the center of the dielectric layers 11a2 of the capacitive part 11a.Type: ApplicationFiled: May 19, 2017Publication date: November 30, 2017Inventors: Daisuke SAKATE, Sadanori SHIMODA, Fumi TANIGUCHI, Minoru RYU
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Patent number: 9721727Abstract: A multilayer ceramic capacitor has a laminate including dielectric layers laminated alternately with internal electrode layers of different polarities, wherein the dielectric layer contains ceramic grains having Ba, Ti, and X (wherein X represents at least one type of element selected from the group consisting of Mo, Ta, Nb, and W) and a variation in the concentration distribution of X above in the ceramic grain is within ±5%. The multilayer ceramic capacitor can offer excellent service life characteristics even when the thickness of the dielectric layer is 0.8 ?m or less, as well as excellent bias characteristics.Type: GrantFiled: November 18, 2015Date of Patent: August 1, 2017Assignee: TAIYO YUDEN CO., LTDInventors: Chie Kawamura, Tetsuo Shimura, Minoru Ryu, Koichiro Morita, Yukihiro Konishi, Yoshiki Iwazaki
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Publication number: 20170152187Abstract: Dielectric layers are prepared using a dielectric material that contains a ceramic powder having Ba, Ti, and additive element X which is solid-solubilized and is at least one element selected from the group consisting of Mo, Ta, Nb, and W, wherein the standard deviation of the ratio of the peak intensity of the additive element X (XK?) measured by STEM-EDX, and the sum of the peak intensity of the Ti and peak intensity of the Ba (BaL?+TiK?) measured by STEM-EDX, is less than 10.5% of the average ratio as measured at a total of five points including the three points that divide the maximum diameter of one grain of the ceramic powder into four equal parts, and two excluding the center point of the three points that divide the diameter crossing at right angles with the maximum diameter at its center point, into four equal parts.Type: ApplicationFiled: November 29, 2016Publication date: June 1, 2017Inventors: Kunihiko NAGAOKA, Kazumichi HIROI, Minoru RYU, Chie KAWAMURA
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Patent number: 9666371Abstract: A multilayer ceramic capacitor has a laminate comprising dielectric layers stacked alternately with internal electrode layers of different polarities, wherein: the dielectric layers contain ceramic grains whose primary component is BaTiO3; the ceramic grains contain at least one type of donor element (D) selected from the group that includes Nb, Mo, Ta, and W, and at least one type of acceptor element (A) selected from the group that includes Mg and Mn; and the ratio of the concentration of the donor element (D) and that of the acceptor element (A) (D/A) is greater than 1 at the center parts of the ceramic grains, while the D/A ratio is less than 1 at the outer edge parts of the ceramic grains (if A=0, then D/A=? and D=A=0 never occurs).Type: GrantFiled: January 20, 2016Date of Patent: May 30, 2017Assignee: TAIYO YUDEN CO., LTD.Inventors: Koichiro Morita, Chie Kawamura, Minoru Ryu, Katsuya Taniguchi, Kazumichi Hiroi, Yoshiki Iwazaki
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Publication number: 20170032894Abstract: A multilayer ceramic capacitor includes a laminate constituted by internal electrode layers of different polarities alternately layered via dielectric layers, wherein the multilayer ceramic capacitor is such that the dielectric layers contain ceramic grains whose primary component is BaTiO3, the ceramic grains contain Mo, Mn, rare earth R, and at least one of V and W, and the average valence number of Mo in the ceramic grains is 4.50 to 5.50. The multilayer ceramic capacitor can offer excellent service life characteristics and sufficiently suppress leak current even when the thickness of the dielectric layer is 0.8 ?m or less.Type: ApplicationFiled: July 26, 2016Publication date: February 2, 2017Inventors: Chie KAWAMURA, Yoichiro OGATA, Tetsuo SHIMURA, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20170032895Abstract: A multilayer ceramic capacitor includes a laminate constituted by internal electrode layers of different polarities alternately stacked via dielectric layers, wherein the multilayer ceramic capacitor is such that the dielectric layers contain ceramic grains whose primary component is BaTiO3, the ceramic grains contain Mo, Mn, and rare earth R, and the average valence number of Mo in the ceramic grains is 4.18 to 4.60. The multilayer ceramic capacitor can offer excellent service life characteristics and bias characteristics even when the thickness of the dielectric layer is 0.8 ?m or less.Type: ApplicationFiled: July 26, 2016Publication date: February 2, 2017Inventors: Yoichiro OGATA, Chie KAWAMURA, Tetsuo SHIMURA, Minoru RYU, Yoshiki IWAZAKI
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Publication number: 20160293308Abstract: In an embodiment, a magnetic body includes soft magnetic alloy grains 11 containing Fe, element L, and element M (where element L is Si or Zr and element M is a metal element other than Si or Zr that oxidizes more easily than Fe), as well as oxide film produced from oxidization of part of these grains 11; wherein at least some of the bonds between adjacent soft magnetic alloy grains 11 are by way of the oxide film; the oxide film has an inner film 12a, and an outer film 12b positioned on the outer side of the inner film 12a; and the inner film 12a contains more of element L than element M, while the outer film 12b contains more of element M than element L.Type: ApplicationFiled: March 31, 2016Publication date: October 6, 2016Inventors: Minoru RYU, Shinsuke TAKEOKA, Yoko ORIMO, Yoshiki IWAZAKI, Kenji OTAKE
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Publication number: 20160217924Abstract: A multilayer ceramic capacitor has a laminate comprising dielectric layers stacked alternately with internal electrode layers of different polarities, wherein: the dielectric layers contain ceramic grains whose primary component is BaTiO3; the ceramic grains contain at least one type of donor element (D) selected from the group that includes Nb, Mo, Ta, and W, and at least one type of acceptor element (A) selected from the group that includes Mg and Mn; and the ratio of the concentration of the donor element (D) and that of the acceptor element (A) (D/A) is greater than 1 at the center parts of the ceramic grains, while the D/A ratio is less than 1 at the outer edge parts of the ceramic grains (if A=0, then D/A=? and D=A=0 never occurs).Type: ApplicationFiled: January 20, 2016Publication date: July 28, 2016Inventors: Koichiro Morita, Chie Kawamura, Minoru Ryu, Katsuya Taniguchi, Kazumichi Hiroi, Yoshiki Iwazaki
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Publication number: 20160189865Abstract: A multilayer ceramic capacitor has a laminate including dielectric layers laminated alternately with internal electrode layers of different polarities, wherein the dielectric layer contains ceramic grains having Ba, Ti, and X (wherein X represents at least one type of element selected from the group consisting of Mo, Ta, Nb, and W) and a variation in the concentration distribution of X above in the ceramic grain is within ±5%. The multilayer ceramic capacitor can offer excellent service life characteristics even when the thickness of the dielectric layer is 0.8 ?m or less, as well as excellent bias characteristics.Type: ApplicationFiled: November 18, 2015Publication date: June 30, 2016Inventors: Chie KAWAMURA, Tetsuo SHIMURA, Minoru RYU, Koichiro MORITA, Yukihiro KONISHI, Yoshiki IWAZAKI
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Publication number: 20130188292Abstract: [Problems] To provide a ceramic composition that retains a high insulation resistance after being fired in a reductive atmosphere to form a laminated body. [Means for Solving the Problem] A novel ceramic composition according to an embodiment of the invention include: (NaxK1-x)(NbyTa1-y)O3 (0?x?1.0, 0.3<y?1.0) as main ingredient and Li and F in an amount ranging from 0.1 to 10.0 mol, calculated on lithium fluoride basis, relative to 100 mol of the main ingredient.Type: ApplicationFiled: July 25, 2012Publication date: July 25, 2013Inventors: KEISUKE KOBAYASHI, Clive A. Randall, Keiichi Hatano, Yutaka Doshida, Yoichi Mizuno, Minoru Ryu