Patents by Inventor Nobuto Morigasaki

Nobuto Morigasaki 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).

  • Patent number: 11501919
    Abstract: A dielectric composition includes main phases and Ca-RE-Si—O segregation phases. The main phases include a main component expressed by ABO3. “A” includes at least one selected from barium and calcium. “B” includes at least one selected from titanium and zirconium. “RE” represents at least one of rare earth elements. A molar ratio of (Si/Ca) is larger than one. A molar ratio of (Si/RE) is larger than one, provided that the molar ratio of (Si/RE) is a molar ratio of silicon included in the segregation phases to the rare earth elements included therein. An average length of major axes of the segregation phases is 1.30-2.80 times as large as an average particle size of the main phases. An average length of minor axes of the segregation phases is 0.21-0.48 times as large as an average particle size of the main phases.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: November 15, 2022
    Assignee: TDK CORPORATION
    Inventors: Toshihiro Iguchi, Nobuto Morigasaki
  • Publication number: 20220254568
    Abstract: A dielectric composition includes main-phase particles each including a main component having a perovskite crystal structure represented by a general formula of ABO3. At least a part of the main-phase particles has a core-shell structure. The dielectric composition includes RA, RB, M, and Si. Each of A, B, RA, RB, and M is one or more elements selected from a specific element group. SRA/SRB>CRA/CRB is satisfied, where CRA is an RA content (mol %) to the main component in terms of RA2O3, and CRB is an RB content (mol %) to the main component in terms of RB2O3, in the dielectric composition, and SRA is an average RA content (mol %), and SRB is an average RB content (mol %), in a shell part of the core-shell structure.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 11, 2022
    Applicant: TDK CORPORATION
    Inventors: Taku MURAKAMI, Nobuto MORIGASAKI, Takuma ARIIZUMI, Toshihiko KANEKO, Yasuhiro ITO
  • Publication number: 20220254569
    Abstract: A dielectric composition includes a main phase and segregation phases each including RE (at least one rare earth element). The main phase includes a main component having a perovskite crystal structure of ABO3 (A is one or more selected from Ba, Sr, and Ca, and B is one or more selected from Ti, Zr, and Hf). The segregation phases are classified into first segregation phases whose atomic ratio of Si to RE is 0 or more and 0.20 or less and second segregation phases whose atomic ratio of Si to the RE is more than 0.20. 0?S1/S2?0.10 is satisfied on a cross section of the dielectric composition, where S1 is an area ratio of the first segregation phases, and S2 is an area ratio of the second segregation phases. An atomic ratio of Si to RE in the second segregation phases is 0.80 or less on average.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 11, 2022
    Applicant: TDK CORPORATION
    Inventors: Takuma ARIIZUMI, Taku MURAKAMI, Nobuto MORIGASAKI, Toshihiko KANEKO, Yasuhiro ITO
  • Publication number: 20220254567
    Abstract: A dielectric composition includes a main-phase particle and segregation particles. The main-phase particle includes a main component having a perovskite crystal structure represented by a general formula of ABO3. The dielectric composition includes RA, RB, M, and Si. Each of A, B, RA, RB, and M is one or more elements selected from a specific element group. Each of an RA content CRA to the main component, an RB content CRB to the main component, an M content to the main component, and a Si content to the main component is within a predetermined range. 0.50<(?/?)/(CRA/CRB)?1.00 is satisfied, where a is an average RA content (mol %) and f3 is an average RB content (mol %) of specific segregation particles mainly including RA, RB, Si, Ba, and Ti in the segregation particles.
    Type: Application
    Filed: January 31, 2022
    Publication date: August 11, 2022
    Applicant: TDK CORPORATION
    Inventors: Taku MURAKAMI, Nobuto MORIGASAKI, Takuma ARIIZUMI, Toshihiko KANEKO, Yasuhiro ITO
  • Publication number: 20220254570
    Abstract: A dielectric composition includes a main phase, first segregation phases, and second segregation phases. The main phase includes a main component having a perovskite crystal structure of ABO3 (A is one or more selected from Ba, Sr, and Ca, and B is one or more selected from Ti, Zr, and Hf). The first segregation phases include RE (one or more selected from rare earth elements), A, Si, Ti, and O. The second segregation phases include RE, A, Ti, and O and do not substantially include Si. 0.10<S2/S1?1.50 is satisfied on a cross section of the dielectric composition, where S1 is an area ratio of the first segregation phases, and S2 is an area ratio of the second segregation phases.
    Type: Application
    Filed: February 1, 2022
    Publication date: August 11, 2022
    Applicant: TDK CORPORATION
    Inventors: Takuma ARIIZUMI, Taku MURAKAMI, Nobuto MORIGASAKI, Toshihiko KANEKO, Yasuhiro ITO
  • Publication number: 20220246354
    Abstract: An electronic component includes an element body having a functional layer and an internal electrode layer, and an external electrode formed on a surface of the element body and connected to the internal electrode layer electrically. The chlorine concentration of the element body of the electronic component is 10 ppm or less.
    Type: Application
    Filed: January 6, 2022
    Publication date: August 4, 2022
    Applicant: TDK CORPORATION
    Inventors: Kosuke TAKANO, Toshihiko KANEKO, Nobuto MORIGASAKI, Yasushi KAWASHIMA, Momoyo SASAKI
  • Publication number: 20220194859
    Abstract: A dielectric ceramic composition contains dielectric particles containing a main component represented by a composition formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 and grain boundaries present between the dielectric particles. The values of m, x, y, and z in the composition formula are all molar ratios. In the composition formula, 0.9?m?1.4, 0?x<1.0, 0<y?1.0, 0.9?(x+y)?1.0, and 0.9?z?1.0 are satisfied. The dielectric particles contain specific structural particles having a predetermined intragranular structure, and each of the specific structural particles intragranularly includes a first region and a second region having different Ca concentrations from each other. C2/C1 is less than 0.8 in which C1 is an average value of the Ca concentration in the first region and C2 is an average value of the Ca concentration in the second region.
    Type: Application
    Filed: December 15, 2021
    Publication date: June 23, 2022
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Yasuhiro ITO, Nobuto MORIGASAKI, Toshihiko KANEKO, Toshihiro IGUCHI
  • Publication number: 20210304966
    Abstract: A dielectric ceramic composition includes a barium titanate, an oxide of an R element, an oxide of an M element, and an oxide containing Si. The R element is one or more elements selected from Eu, Gd, Tb, Dy, Y, Ho, and Yb. The M element is one or more elements selected from Mg, Ca, Mn, V, and Cr. A ratio of an amount of the oxide of the R element in terms of R2O3 to an amount of the oxide containing Si in terms of SiO2 is 0.8:1 to 2.2:1. A ratio of an amount of the oxide of the M element in terms of MO to the amount of the oxide containing Si in terms of SiO2 is 0.2:1 to 1.8:1.50% or more of the number of dielectric particles constituting the dielectric ceramic composition is core-shell dielectric particles having a core-shell structure.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 30, 2021
    Applicant: TDK CORPORATION
    Inventors: Taku MURAKAMI, Nobuto MORIGASAKI, Dan SAKURAI, Takuma ARIIZUMI, Toshihiko KANEKO
  • Patent number: 11114247
    Abstract: The object of the present invention is to provide the multilayer ceramic capacitor having no deterioration of dielectric properties even in case an inhibitor of an internal electrode layer is pushed out to a dielectric layer when sintering. The multilayer ceramic capacitor 1 including a capacitor element body 10 comprising a dielectric layer 2 and an internal electrode layer 3 stacked in an alternating manner, wherein when Za represents Zr concentration of an dielectric particle in a center part 6 of the dielectric layer 2 and Zb represents Zr concentration of a dielectric particle near the internal electrode layer, 0<(Za/Zb)<1 is satisfied.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: September 7, 2021
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Toshihiko Kaneko, Nobuto Morigasaki, Toshinari Takahashi, Yasuhiro Ito
  • Patent number: 11072564
    Abstract: A dielectric ceramic composition having improved insulation specific resistance and a highly accelerated lifetime. The dielectric ceramic composition includes a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO3, where A is Ba and the like, and B is Ti and the like), and a rare earth element component R, in which a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more. The rare earth element has a specified concentration gradient or concentration variation.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: July 27, 2021
    Assignee: TDK CORPORATION
    Inventors: Takuma Ariizumi, Toshihiko Kaneko, Nobuto Morigasaki, Yasuhiro Ito
  • Patent number: 11056280
    Abstract: The object of the present invention is to provide a multilayer ceramic electronic component having improved highly accelerated lifetime and specific permittivity. A multilayer ceramic electronic component comprising a multilayer body in which an internal electrode layer and a dielectric layer are stacked in alternating manner, wherein the dielectric layer comprises a dielectric ceramic composition having a main component expressed by a general formula ABO3 (A is Ba and the like, and B is Ti and the like) and a rare earth component R, a segregation phase including the rare earth component R exists in the dielectric layer, an area ratio of the segregation phases in a cross section along a stacking direction is 104 ppm to 961 ppm, and 96% or more of a total area of the segregation phases contact with the internal electrode layer.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: July 6, 2021
    Assignee: TDK CORPORATION
    Inventors: Takuma Ariizumi, Toshihiko Kaneko, Nobuto Morigasaki, Yasuhiro Ito
  • Publication number: 20210202169
    Abstract: A dielectric composition includes main phases and Ca-RE-Si—O segregation phases. The main phases include a main component expressed by ABO3. “A” includes at least one selected from barium and calcium. “B” includes at least one selected from titanium and zirconium. “RE” represents at least one of rare earth elements. A molar ratio of (Si/Ca) is larger than one. A molar ratio of (Si/RE) is larger than one, provided that the molar ratio of (Si/RE) is a molar ratio of silicon included in the segregation phases to the rare earth elements included therein. An average length of major axes of the segregation phases is 1.30-2.80 times as large as an average particle size of the main phases. An average length of minor axes of the segregation phases is 0.21-0.48 times as large as an average particle size of the main phases.
    Type: Application
    Filed: December 11, 2020
    Publication date: July 1, 2021
    Applicant: TDK CORPORATION
    Inventors: Toshihiro IGUCHI, Nobuto MORIGASAKI
  • Patent number: 10804033
    Abstract: The object of the present invention is to provide a dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime. The dielectric ceramic composition of the present invention has a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9?m?1.1, 0?x?0.5, 0?y?0.3, 0?(x+y)?0.6, and 0.03?z?0.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: October 13, 2020
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Toshihiko Kaneko, Nobuto Morigasaki, Toshinari Takahashi, Yasuhiro Ito
  • Patent number: 10614957
    Abstract: A dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime, even under high electric field intensity. A dielectric ceramic composition having a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9<m<1.1, 0<x<0.5, 0<y<0.3, 0<(x+y)<0.6, and 0.03<z<0.3), and a first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), wherein the dielectric ceramic composition includes dielectric particles and a particle boundary.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: April 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Toshihiko Kaneko, Nobuto Morigasaki, Toshinari Takahashi, Yasuhiro Ito
  • Publication number: 20200039887
    Abstract: The object of the present invention is to provide a dielectric ceramic composition having even improved insulation specific resistance and highly accelerated lifetime. A dielectric ceramic composition comprising a dielectric particle having a core-shell structure including a main component expressed by a general formula ABO3 (A is Ba and the like; and B is Ti and the like) and a rare earth element component R, in which a shell part of the core-shell structure has an average rare earth element concentration C of 0.3 atom % or more, and a rare earth element concentration gradient S is ?0.010 atom %/nm?S?0.009 atom %/nm or a rare earth element concentration variation satisfies ?/C?0.15 (a is a standard deviation of a rare earth element concentration and C is an average rare earth element concentration).
    Type: Application
    Filed: July 15, 2019
    Publication date: February 6, 2020
    Applicant: TDK CORPORATION
    Inventors: Takuma ARIIZUMI, Toshihiko KANEKO, Nobuto MORIGASAKI, Yasuhiro ITO
  • Publication number: 20200043657
    Abstract: The object of the present invention is to provide a multilayer ceramic electronic component having improved highly accelerated lifetime and specific permittivity. A multilayer ceramic electronic component comprising a multilayer body in which an internal electrode layer and a dielectric layer are stacked in alternating manner, wherein the dielectric layer comprises a dielectric ceramic composition having a main component expressed by a general formula ABO3 (A is Ba and the like, and B is Ti and the like) and a rare earth component R, a segregation phase including the rare earth component R exists in the dielectric layer, an area ratio of the segregation phases in a cross section along a stacking direction is 104 ppm to 961 ppm, and 96% or more of a total area of the segregation phases contact with the internal electrode layer.
    Type: Application
    Filed: July 15, 2019
    Publication date: February 6, 2020
    Applicant: TDK CORPORATION
    Inventors: Takuma ARIIZUMI, Toshihiko KANEKO, Nobuto MORIGASAKI, Yasuhiro ITO
  • Publication number: 20190237255
    Abstract: A dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime, even under high electric field intensity. A dielectric ceramic composition having a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9<m<1.1, 0<x<0.5, 0<y<0.3, 0<(x+y)<0.6, and 0.03<z<0.3), and a first sub component made of an oxide of a rare earth element R (note that, R is at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), wherein the dielectric ceramic composition includes dielectric particles and a particle boundary.
    Type: Application
    Filed: January 17, 2019
    Publication date: August 1, 2019
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Toshihiko KANEKO, Nobuto MORIGASAKI, Toshinari TAKAHASHI, Yasuhiro ITO
  • Publication number: 20190237264
    Abstract: The object of the present invention is to provide the multilayer ceramic capacitor having no deterioration of dielectric properties even in case an inhibitor of an internal electrode layer is pushed out to a dielectric layer when sintering. The multilayer ceramic capacitor 1 including a capacitor element body 10 comprising a dielectric layer 2 and an internal electrode layer 3 stacked in an alternating manner, wherein when Za represents Zr concentration of an dielectric particle in a center part 6 of the dielectric layer 2 and Zb represents Zr concentration of a dielectric particle near the internal electrode layer, 0<(Za/Zb)<1 is satisfied.
    Type: Application
    Filed: January 17, 2019
    Publication date: August 1, 2019
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Toshihiko KANEKO, Nobuto MORIGASAKI, Toshinari TAKAHASHI, Yasuhiro ITO
  • Publication number: 20190237254
    Abstract: The object of the present invention is to provide a dielectric ceramic composition having good properties, particularly good IR property and high temperature accelerated lifetime. The dielectric ceramic composition of the present invention has a main component made of a perovskite type compound expressed by a compositional formula of (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, m, x, y, and z of the above compositional formula all represent molar ratios, and each satisfies 0.9?m?1.1, 0?x?0.5, 0?y?0.3, 0?(x+y)?0.6, and 0.03?z?0.
    Type: Application
    Filed: December 21, 2018
    Publication date: August 1, 2019
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Toshihiko KANEKO, Nobuto MORIGASAKI, Toshinari TAKAHASHI, Yasuhiro ITO
  • Patent number: 10074480
    Abstract: A dielectric ceramic composition having good characteristic even under high electric field intensity, and particularly good IR characteristic and high temperature accelerated lifetime. The present invention is a dielectric ceramic composition comprising, a main component comprising a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, a first sub component comprising oxides of a rare earth element, a second sub component as a sintering agent, wherein said dielectric ceramic composition is a complete solid solution particle wherein the rare earth element is solid dissolved to entire dielectric particle, or a core-shell particle having high ratio of the diffusion phase, and comprises the dielectric particle having 5 to 20 atom % of the average concentration of the rare earth element in the diffusion phase, and having uniform concentration distribution of the rare earth element in the diffusion phase.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: September 11, 2018
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Nobuto Morigasaki, Tatsuya Ishii, Takuma Ariizumi, Shinsuke Hashimoto, Yasuhiro Ito