Patents by Inventor Mari Miyauchi
Mari Miyauchi 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: 8592334Abstract: A dielectric ceramic composition comprises, a main component including barium titanate, a first subcomponent including MgO, a second subcomponent including sintering aids of SiO2 compound, a third subcomponent including at least one of V2O5, Nb2O5 and WO3, a fourth A subcomponent including RA oxide (note that, RA is at least one selected from Tb, Gd and Dy), a fourth B subcomponent including RB oxide (note that, RB is at least one selected from Ho, Y and Yb), and a fifth subcomponent including MnO or Cr2O3.Type: GrantFiled: March 30, 2009Date of Patent: November 26, 2013Assignee: TDK CorporationInventors: Kosuke Takano, Mari Miyauchi, Nobuto Morigasaki, Hideaki Seki, Makoto Maeda, Takahiro Yamada
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Patent number: 8192851Abstract: A dielectric ceramic composition comprises a main component including BaTiO3, a first subcomponent including BaZrO3, a second subcomponent including an oxide of Mg, a third subcomponent including an oxide of rare earth, a fourth subcomponent including an oxide of at least one element selected from Mn, Cr, Co and Fe, and a fifth subcomponent including an oxide of at least one element selected from Si, Al, Ge, B and Li. At least a part of dielectric particles constituting the dielectric ceramic composition comprises a surface diffusion structure comprised of a central layer and a diffusion layer therearound. CR and CRmax, respectively defined as a concentration of said “R” in a proximity point to a boundary face of the dielectric particle and a maximum concentration of the “R” in the diffusion layer, satisfy a relation of CRmax/CR>1.Type: GrantFiled: February 21, 2008Date of Patent: June 5, 2012Assignee: TDK CorporationInventors: Sanshiro Aman, Takashi Kojima, Mari Miyauchi, Masakazu Hosono, Dan Sakurai, Kosuke Takano, Nobuto Morigasaki
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Patent number: 8008221Abstract: A dielectric ceramic composition of the present invention comprises; BamTiO2+m (note that, m is 0.99?m?1.01), and BanZrO2+n (note that, n is 0.99?n?1.01); wherein said dielectric ceramic composition consists of plurality of dielectric particles and a grain boundary phase existing between said dielectric particles adjacent to each other, when said dielectric particle having BamTiO2+m as a main component is set to a first dielectric particle, said dielectric particle having BanZrO2+n as a main component is set to a second dielectric particle, an average crystal diameter of said first dielectric particle is set to D1 (?m), and an average crystal diameter of said second dielectric particle is set to D2 (?m), then a ratio (D2/D1) of said D2 with respect to said D1 is 0.04 to 0.33, said D2 is 0.02 to 0.25 ?m, and in said dielectric ceramic composition a ratio of the total number of said second dielectric particle with respect to the total number of said first dielectric particle is 0.10 to 2.Type: GrantFiled: December 4, 2008Date of Patent: August 30, 2011Assignee: TDK CorporationInventors: Sanshiro Aman, Mari Miyauchi, Hideaki Seki
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Patent number: 7790645Abstract: The present invention relates to a dielectric ceramic composition comprising BaTiO3, BaZrO3, and the oxide of R wherein, when A is the content of BaZrO3, and C is the content of the oxide R, with respect to 100 moles of BaTiO3, then A is 40?A?65 moles and C is 4?C?15 moles; plus said dielectric composition satisfies the equation (1) and (2). The present invention can provide a dielectric ceramic composition good in IR lifetime, and capable to be suitably used for medium-high voltage which has a high rated voltage (for example, 100V or more). 0.0038A?0.147?B?0.004A+0.04??Equation (1) (note that, B is a ratio of the X-ray diffraction maximum intensity among peaks of said BaZrO3 with respect to the X-ray diffraction maximum intensity among peaks of said BaTiO3). 0.0041C?0.0115?D?0.0046C+0.084??Equation (2) (note that, D is a ratio of the X-ray diffraction maximum intensity among peaks of the oxide of said R with respect to the X-ray diffraction maximum intensity among peaks of said BaTiO3).Type: GrantFiled: September 25, 2008Date of Patent: September 7, 2010Assignee: TDK CorporationInventors: Hideaki Seki, Sanshiro Aman, Mari Miyauchi
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Publication number: 20090246508Abstract: A dielectric ceramic composition comprises, a main component including barium titanate, a first subcomponent including MgO, a second subcomponent including sintering aids of SiO2 compound, a third subcomponent including at least one of V2O5, Nb2O5 and WO3, a fourth A subcomponent including RA oxide (note that, RA is at least one selected from Tb, Gd and Dy), a fourth B subcomponent including R oxide (note that, R is at least one selected from Ho, Y and Yb), and a fifth subcomponent including MnO or Cr2O3.Type: ApplicationFiled: March 30, 2009Publication date: October 1, 2009Applicant: TDK CORPORATIONInventors: Kosuke Takano, Mari Miyauchi, Nobuto Morigasaki, Hideaki Seki, Makoto Maeda, Takahiro Yamada
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Patent number: 7580242Abstract: The invention aims at providing a dielectric ceramic composition including BamTiO2+m where “m” satisfies 0.99?m?1.01 and BanZrO2+n where “n” satisfies 0.99?n?1.01, an oxide of Mg, an oxide of R where R is at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, an oxide of at least one element selected from Mn, Cr, Co and Fe, and an oxide of at least one element selected from Si, Li, Al, Ge and B. 35 to 65 moles of BanZrO2+n, 4 to 12 moles of an oxide of Mg, 4 to 15 moles of an oxide of R, 0.5 to 3 moles of an oxide of Mn, Cr, Co and Fe, and 3 to 9 moles of an oxide of Si, Li, Al, Ge and B are included therein per 100 moles of the BamTiO2+m.Type: GrantFiled: February 21, 2008Date of Patent: August 25, 2009Assignee: TDK CorporationInventors: Sanshiro Aman, Takashi Kojima, Mari Miyauchi, Masakazu Hosono, Dan Sakurai, Kosuke Takano, Nobuto Morigasaki
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Publication number: 20090149312Abstract: A dielectric ceramic composition of the present invention comprises; BamTiO2+m (note that, m is 0.99?m?1.01), and BanZrO2+n (note that, n is 0.99?n?1.01); wherein said dielectric ceramic composition consists of plurality of dielectric particles and a grain boundary phase existing between said dielectric particles adjacent to each other, when said dielectric particle having BamTiO2+m as a main component is set to a first dielectric particle, said dielectric particle having BanZrO2+n as a main component is set to a second dielectric particle, an average crystal diameter of said first dielectric particle is set to D1 (?m), and an average crystal diameter of said second dielectric particle is set to D2 (?m), then a ratio (D2/D1) of said D2 with respect to said D1 is 0.04 to 0.33, said D2 is 0.02 to 0.25 ?m, and in said dielectric ceramic composition a ratio of the total number of said second dielectric particle with respect to the total number of said first dielectric particle is 0.10 to 2.Type: ApplicationFiled: December 4, 2008Publication date: June 11, 2009Applicant: TDK CORPORATIONInventors: Sanshiro Aman, Mari Miyauchi, Hideaki Seki
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Publication number: 20090088315Abstract: The present invention relates to a dielectric ceramic composition comprising BaTiO3, BaZrO3, and the oxide of R wherein, when A is the content of BaZrO3, and C is the content of the oxide R, with respect to 100 moles of BaTiO3, then A is 40?A?65 moles and C is 4?C?15 moles; plus said dielectric composition satisfies the equation (1) and (2). The present invention can provide a dielectric ceramic composition good in IR lifetime, and capable to be suitably used for medium-high voltage which has a high rated voltage (for example, 100V or more). 0.0038A?0.147?B?0.004A+0.04??Equation (1) (note that, B is a ratio of the X-ray diffraction maximum intensity among peaks of said BaZrO3 with respect to the X-ray diffraction maximum intensity among peaks of said BaTiO3). 0.0041C?0.0115?D?0.0046C+0.084??Equation (2) (note that, D is a ratio of the X-ray diffraction maximum intensity among peaks of the oxide of said R with respect to the X-ray diffraction maximum intensity among peaks of said BaTiO3).Type: ApplicationFiled: September 25, 2008Publication date: April 2, 2009Applicant: TDK CORPORATIONInventors: Hideaki Seki, Sanshiro Aman, Mari Miyauchi
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Publication number: 20080297979Abstract: A dielectric ceramic composition comprising BamTiO2+m (note that “m” satisfies 0.99?m?1.01) and BanZrO2+n (note that “n” satisfies 0.99?n?1.01), an oxide of Mg, an oxide of R (note that R is at least one selected from Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu), an oxide of at least one element selected from Mn, Cr, Co and Fe, and an oxide of at least one element selected from Si, Li, Al, Ge and B. With respect to 100 moles of said BamTiO2+m, 35 to 65 moles of BanZrO2+n, 4 to 12 moles of an oxide of Mg, 4 to 15 moles of an oxide of R, 0.5 to 3 moles of an oxide of Mn, Cr, Co and Fe, and 3 to 9 moles of an oxide of Si, Li, Al, Ge and B are included therein.Type: ApplicationFiled: February 21, 2008Publication date: December 4, 2008Applicant: TDK CORPORATIONInventors: Sanshiro Aman, Takashi Kojima, Mari Miyauchi, Masakazu Hosono, Dan Sakurai, Kosuke Takano, Nobuto Morigasaki
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Publication number: 20080226944Abstract: A dielectric ceramic composition comprises a main component including BaTiO3, a first subcomponent including BaZrO3, a second subcomponent including an oxide of Mg, a third subcomponent including an oxide of rare earth, a fourth subcomponent including an oxide of at least one element selected from Mn, Cr, Co and Fe, and a fifth subcomponent including an oxide of at least one element selected from Si, Al, Ge, B and Li. At least a part of dielectric particles constituting the dielectric ceramic composition comprises a surface diffusion structure comprised of a central layer and a diffusion layer therearound. CR and CRmax, respectively defined as a concentration of said “R” in a proximity point to a boundary face of the dielectric particle and a maximum concentration of the “R” in the diffusion layer, satisfy a relation of CRmax/CR>1.Type: ApplicationFiled: February 21, 2008Publication date: September 18, 2008Applicant: TDK CORPORATIONInventors: Sanshiro Aman, Takashi Kojima, Mari Miyauchi, Masakazu Hosono, Dan Sakurai, Kosuke Takano, Nobuto Morigasaki
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Patent number: 7335329Abstract: A method of producing a multilayer ceramic capacitor having internal electrode layers and dielectric layers with dielectric particles is disclosed. An average particle diameter of the dielectric particles, when measured parallel with the direction of the internal electrode layers, is larger than a thickness of the dielectric layer. A ratio (R/d) between the average particle diameter (R) and the thickness (d) of the dielectric layer is 1<R/d<3.Type: GrantFiled: August 5, 2003Date of Patent: February 26, 2008Assignee: TDK CorporationInventors: Yukie Nakano, Shunichi Yuri, Mari Miyauchi, Daisuke Iwanaga
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Patent number: 7158364Abstract: The present invention relates to a multilayer ceramic capacitor comprising: an element main body in which a dielectric layer and an inner electrode layer are alternately laminated, the inner electrode layer comprises: a composite structure having an inner electrode main layer of a base metal; and ceramic particles buried in the inner electrode main layer, therefore the inner electrode layer can be prevented from being interrupted by spheroidizing during the forming of the inner electrode layer, that is, drop of an electrode effective area can be inhibited, and high electrostatic capacity is obtained.Type: GrantFiled: March 1, 2005Date of Patent: January 2, 2007Assignee: TDK CorporationInventors: Mari Miyauchi, Akira Sato, Kaori Shiozawa
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Publication number: 20060254693Abstract: A method of production of a multilayer ceramic electronic device having internal electrode layers and dielectric layers having thicknesses of less than 2 ?m, having a step of firing a stack formed using a dielectric layer paste including a dielectric paste dielectric material and an internal electrode layer paste including a sintering inhibiting dielectric material, the dielectric paste dielectric material including a main ingredient material and sub ingredient material, the sintering inhibiting dielectric material in the internal electrode paste including at least a sintering inhibiting main ingredient material, the sintering inhibiting main ingredient material being substantially the same in composition as the main ingredient material included in the dielectric paste dielectric material and having a lattice constant over 3.991 ? and less than 4.064 ?.Type: ApplicationFiled: April 27, 2006Publication date: November 16, 2006Applicant: TDK CorporationInventors: Takako Murosawa, Mari Miyauchi, Kazunori Noguchi, Akira Sato
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Publication number: 20060198078Abstract: The present invention relates to a multilayer ceramic capacitor comprising: an element main body in which a dielectric layer and an inner electrode layer are alternately laminated, the inner electrode layer comprises: a composite structure having an inner electrode main layer of a base metal; and ceramic particles buried in the inner electrode main layer, therefore the inner electrode layer can be prevented from being interrupted by spheroidizing during the forming of the inner electrode layer, that is, drop of an electrode effective area can be inhibited, and high electrostatic capacity is obtained.Type: ApplicationFiled: March 1, 2005Publication date: September 7, 2006Applicant: TDK CorporationInventors: Mari Miyauchi, Akira Sato, Kaori Shiozawa
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Patent number: 7072170Abstract: There is provided a multilayer ceramic capacitor 1, having an internal electrode layer 3 and an interlayer dielectric layer 2 having a thickness of 3.5 ?m or less, wherein the interlayer dielectric layer 2 is composed of contact dielectric particles 2a contacting said internal electrode layer and noncontact dielectric particles 2b not contacting said internal electrode layer; and when assuming that an average particle diameter of the contact dielectric particles 2a is D50e and an average particle diameter of the noncontact dielectric particles 2b is D50d, D50e<0.450 ?m and (D50e/D50d)=1.20 to 3.00 (note that 1.20 and 3.00 are excluded) are satisfied, wherein an improvement of a bias characteristic at 85° C. can be expected even when the interlayer dielectric layer 2 is made thin.Type: GrantFiled: November 26, 2004Date of Patent: July 4, 2006Assignee: TDK CorporationInventors: Mari Miyauchi, Kazunori Noguchi, Takako Hibi, Akira Sato
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Patent number: 7046502Abstract: A multilayer ceramic capacitor having an internal electrode layer and a dielectric layer having a thickness of less than 2 ?m is provided, wherein the dielectric layer contains a plurality of dielectric particles, and when it is assumed that standard deviation of a particle distribution of the entire dielectric particles in the dielectric layer is ? (no unit), an average particle diameter of the entire dielectric particles in the dielectric layer is D50 (unit: ?m), and a rate that dielectric particles (coarse particles) having an average particle diameter of 2.25 times of the D50 exist in the entire dielectric particles is p (unit: %), the ? and p satisfy ?<0.130 and p<12%; by which a TC bias characteristic can be expected to be improved while maintaining various electric characteristics, particularly a sufficient permittivity, even when the interlayer dielectric layer is made thin.Type: GrantFiled: March 30, 2005Date of Patent: May 16, 2006Assignee: TDK CorporationInventors: Takako Murosawa, Mari Miyauchi, Kazunori Noguchi, Akira Sato
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Patent number: 7006345Abstract: The invention aims to provide a multilayer ceramic capacitor with high dielectric constant, a high capacitance, and an excellent reliability by eliminating oxygen vacancy in dielectric layers and suppressing oxidation of Ni inner electrodes. The multilayer ceramic capacitor comprises a multilayered dielectric body composed by alternately piling up dielectric layers containing mainly barium titanate and inner electrode layers containing mainly Ni and a first hetero-phase containing Mg—Si—O as constituent elements exists in the capacitor.Type: GrantFiled: January 7, 2005Date of Patent: February 28, 2006Assignee: TDK CorporationInventors: Yukie Nakano, Mari Miyauchi, Akira Sato
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Patent number: 6995968Abstract: In order to provide dielectric ceramic composition having low IR defect rate and high relative dielectric constant even when the multilayer ceramic capacitor is made thinner, dielectric ceramic composition including a main component expressed by a composition formula {{Ba(1-x)Cax}O}A{Ti(1-y-z)ZryMgz}BO2 and subcomponents of Mn oxide, Y oxide, V oxide and Si oxide is provided. In the above formula, A, B, x, y and z are as follows: 0.995?A/B?1.020, 0.0001?x?0.07, preferably 0.001?x<0.05, 0.1?y?0.3 and 0.0005?z?0.01, preferably 0.003?z?0.01.Type: GrantFiled: September 29, 2004Date of Patent: February 7, 2006Assignee: TDK CorporationInventors: Kazushige Ito, Shunichi Yuri, Yukie Nakano, Mari Miyauchi, Takako Hibi, Daisuke Iwanaga, Masakazu Hosono
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Patent number: 6987662Abstract: A multilayer ceramic capacitor 1 having internal electrode layers 3, internal dielectric layers 2 having the thickness of less than 2 ?m, and external dielectric layers 20 wherein; the internal dielectric layers 2 and the external dielectric layers 20 include a plural number of dielectric particles 2a, 20a, and when y1 is ratio(D50a/D50b) of D50a and D50b where D50a is an average particle size of dielectric particles 2a included in the internal dielectric layers 2 and D50b is an average particle size of dielectric particles 20a included in the external dielectric layer 20 and located at least 5 ?m away from an internal electrode layer 3a, arranged outermost part of all the internal electrode layers, to the stacked direction, and x is thickness of the internal dielectric layer 2, y1 and x satisfy the following equations, y1??0.75x+2.275 and y1??0.75x+1.675.Type: GrantFiled: January 27, 2005Date of Patent: January 17, 2006Assignee: TDK CorporationInventors: Takako Hibi, Kazunori Noguchi, Mari Miyauchi, Akira Sato
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Patent number: RE40665Abstract: A multilayer ceramic capacitor 1 having internal electrode layers 3, internal dielectric layers 2 having the thickness of less than 2 ?m, and external dielectric layers 20 wherein; the internal dielectric layers 2 and the external dielectric layers 20 include a plural number of dielectric particles 2a, 20a, and when y1 is ratio(D50a/D50b) of D50a and D50b where D50a is an average particle size of dielectric particles 2a included in the internal dielectric layers 2 and D50b is an average particle size of dielectric particles 20a included in the external dielectric layer 20 and located at least 5 ?m away from an internal electrode layer 3a, arranged outermost part of all the internal electrode layers, to the stacked direction, and x is thickness of the internal dielectric layer 2, y1 and x satisfy the following equations, y1??0.75x+2.275 and y1??0.75x+1.675.Type: GrantFiled: May 10, 2006Date of Patent: March 17, 2009Assignee: TDK CorporationInventors: Takako Murosawa, Kazunori Noguchi, Mari Miyauchi, Akira Sato