Patents by Inventor Takuma ARIIZUMI

Takuma ARIIZUMI 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).

  • 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: 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: 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: 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: 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: 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: 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: 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
  • 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
  • Patent number: 10059630
    Abstract: The object of the present invention is to provide the dielectric ceramic composition having good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition according to the present invention comprises a main component comprising a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, said “m”, “x”, “y” and “z” all show a mol ratio, and each satisfies 0.94?m?1.1, 0?x?0.2, 0?y?0.2, 0.06?z<0.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: August 28, 2018
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Nobuto Morigasaki, Tatsuya Ishii, Takuma Ariizumi
  • Patent number: 9966190
    Abstract: A dielectric ceramic composition has good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition has a main component having a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, a first sub component having oxides of a rare earth element R, a second sub component as a sintering agent, wherein the dielectric particles has dielectric particles having high diffusion rate of the rare earth element, preferably of a complete solid solution particle, and when a concentration of Ti atom in the diffusion phase is 100 atom %, then an average concentration of the rare earth element R in the diffusion phase is 5 atom % or more, and an average concentration of Zr in the diffusion phase is 10 atom % or more.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: May 8, 2018
    Assignee: TDK CORPORATION
    Inventors: Dan Sakurai, Nobuto Morigasaki, Tatsuya Ishii, Takuma Ariizumi, Shinsuke Hashimoto, Yasuhiro Ito
  • Publication number: 20170283328
    Abstract: The object of the present invention is to provide the dielectric ceramic composition having good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition according to the present invention comprises a main component comprising a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3 (note that, said “m”, “x”, “y” and “z” all show a mol ratio, and each satisfies 0.94?m?1.1, 0?x?0.2, 0?y?0.2, 0.06?z<0.
    Type: Application
    Filed: March 22, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Nobuto MORIGASAKI, Tatsuya ISHII, Takuma ARIIZUMI
  • Publication number: 20170287635
    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: Application
    Filed: March 22, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Nobuto MORIGASAKI, Tatsuya ISHII, Takuma ARIIZUMI, Shinsuke HASHIMOTO, Yasuhiro ITO
  • Publication number: 20170287636
    Abstract: A dielectric ceramic composition has good characteristics even under the high electric field intensity, and particularly good IR characteristic and the high temperature accelerated lifetime. The dielectric ceramic composition has a main component having a perovskite type compound shown by a compositional formula (Ba1-x-ySrxCay)m(Ti1-zZrz)O3, a first sub component having oxides of a rare earth element R, a second sub component as a sintering agent, wherein the dielectric particles has dielectric particles having high diffusion rate of the rare earth element, preferably of a complete solid solution particle, and when a concentration of Ti atom in the diffusion phase is 100 atom %, then an average concentration of the rare earth element R in the diffusion phase is 5 atom % or more, and an average concentration of Zr in the diffusion phase is 10 atom % or more.
    Type: Application
    Filed: March 22, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventors: Dan SAKURAI, Nobuto MORIGASAKI, Tatsuya ISHII, Takuma ARIIZUMI, Shinsuke HASHIMOTO, Yasuhiro ITO