Patents by Inventor Yuki Nagamine

Yuki Nagamine 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: 11657934
    Abstract: An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: May 23, 2023
    Assignee: TDK CORPORATION
    Inventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
  • Patent number: 11302465
    Abstract: To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18<a<40 and 0.5?b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: April 12, 2022
    Assignee: TDK CORPORATION
    Inventors: Ryuji Hashimoto, Masashi Ito, Eiichiro Fukuchi, Yuki Nagamine
  • Patent number: 11205532
    Abstract: A permanent magnet includes R and T (R essentially includes Sm one or more of rare earth elements in addition to Sm, and T essentially includes Fe, or Fe and Co, one or more of transition metal elements in addition to Fe, or Fe and Co). A composition ratio of R in the permanent magnet is 20 at % or more and 40 at % or less. A remaining part is substantially only T, or only T and C. T amount is more than 1.5 times of R amount and less than 4.0 times of the R amount. Main phase grains included in the permanent magnet have an Nd5Fe17 type crystal structure. An average crystal grain size of the main phase grains of the permanent magnet is greater than 1 ?m. A number ratio of main phase grains having a crystal grain size of less than 0.4 ?m is less than 20%.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: December 21, 2021
    Assignee: TDK CORPORATION
    Inventors: Masashi Ito, Yuki Nagamine
  • Patent number: 11152142
    Abstract: An R-T-B based permanent magnet excellent in magnetic properties relatively reduces the amount of a heavy rare earth element used. An R-T-B based permanent magnet, wherein R represents a rare earth element, T an iron group element and B boron, includes main phase grains including an R2T14B crystal phase and grain boundaries formed between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than those in main phase grains. C/R(S)>C/R(C) is satisfied in which C/R(S) represents a C/R ratio (atomic ratio) in R—O—C—N concentrated parts present in a surface of a R-T-B based permanent magnet and C/R(C) represents a C/R ratio (atomic ratio) in the R—O—C—N concentrated parts present in the center of a R-T-B based permanent magnet, and a heavy rare earth element RH is included in the R-T-B based permanent magnet.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: October 19, 2021
    Assignee: TDK CORPORATION
    Inventors: Yuki Nagamine, Masashi Miwa, Yoshinori Fujikawa
  • Patent number: 11078123
    Abstract: A metal oxynitride thin film having a perovskite structure, in which the metal oxynitride thin film has a composition represented by a compositional formula A1+?BOx+?Ny wherein ? is larger than zero and 0.300 or less, x+? is larger than 2.450, and y is 0.300 or more and 0.700 or less, an AO structure having a layered structure parallel to a plane perpendicular to a c-axis of the perovskite structure and having a composition represented by a general formula AO, and the AO structure is bonded with the perovskite structure and incorporated in the perovskite structure.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: August 3, 2021
    Assignee: TDK CORPORATION
    Inventors: Kumiko Yamazaki, Yuki Nagamine, Takeshi Shibahara, Yuji Umeda, Junichi Yamazaki
  • Patent number: 10707018
    Abstract: A polycrystalline dielectric thin film and a capacitor element have a large relative dielectric constant. The polycrystalline dielectric thin film has a perovskite oxynitride as a principal component. The perovskite oxynitride is represented by compositional formula Aa1Bb1OoNn (a1+b1+o+n=5), and the a-axis length of the crystal lattice of the perovskite oxynitride is larger than a theoretical value.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: July 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Kumiko Yamazaki, Hiroshi Chihara, Yuki Nagamine, Junichi Yamazaki, Yuji Umeda
  • Patent number: 10696598
    Abstract: To provide a dielectric porcelain composition and an electronic component that demonstrate ferroelectricity. A dielectric porcelain composition that is characterized by having a perovskite-type oxynitride as a principal component and by including a polycrystalline body that demonstrates ferroelectricity.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: June 30, 2020
    Assignees: TDK CORPORATION, NATIONAL UNIVERSITY CORPORATION HOLLAIDO UNIVERSITY
    Inventors: Kumiko Yamazaki, Yuki Nagamine, Takeshi Shibahara, Shinichi Kikkawa, Yuji Masubuchi
  • Patent number: 10611693
    Abstract: A polycrystalline dielectric thin film and capacitor element has a small dielectric loss tan ?. The polycrystalline dielectric thin film, in which the main composition is a perovskite oxynitride. The perovskite oxynitride is expressed by the compositional formula AaBbOoNn (a+b+o+n=5), where a/b>1 and n?0.7.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: April 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Kumiko Yamazaki, Hiroshi Chihara, Yuki Nagamine, Junichi Yamazaki
  • Publication number: 20200020468
    Abstract: To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18<a<40 and 0.5?b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.
    Type: Application
    Filed: November 30, 2017
    Publication date: January 16, 2020
    Applicant: TDK CORPORATION
    Inventors: Ryuji HASHIMOTO, Masashi ITO, Eiichiro FUKUCHI, Yuki NAGAMINE
  • Patent number: 10479732
    Abstract: A dielectric thin film has a main component including an oxynitride having excellent dielectric property, and a capacitance element includes the dielectric thin film. The dielectric thin film has a main component made of an oxynitride expressed by a compositional formula of AaBbOoNn (a+b+o+n=5), wherein “A” is one or more selected from Sr, Ba, Ca, La, Ce, Pr, Nd, and Na, “B” is one or more selected from Ta, Nb, Ti, and W, and crystalline particles constituting the dielectric thin film are polycrystalline which are not oriented to a particular crystal plane orientation, and further the crystalline particles have columnar shape crystals.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: November 19, 2019
    Assignee: TDK CORPORATION
    Inventors: Takeshi Shibahara, Yuki Nagamine, Kumiko Yamazaki
  • Patent number: 10475586
    Abstract: The object of the present invention is to provide a dielectric thin film and a capacitance element having excellent dielectric property. A dielectric thin film comprising a main component comprised of an oxynitride expressed by a compositional formula of AaBbOoNn (a+b+o+n=5), wherein said “A” is one or more selected from the group consisting of Sr, Ba, Ca, La, Ce, Pr, Nd, and Na, said “B” is one or more selected from the group consisting of Ta, Nb, Ti, and W, and crystalline particles constituting said dielectric thin film are polycrystalline which are not aligned to a particular crystal plane orientation, and a size of a crystallite of the crystalline particles included in the dielectric thin film is 100 nm or less.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: November 12, 2019
    Assignee: TDK CORPORATION
    Inventors: Takeshi Shibahara, Yuki Nagamine, Yoshitomo Tanaka, Kumiko Yamazaki
  • Publication number: 20190333660
    Abstract: A permanent magnet includes R and T (R essentially includes Sm one or more of rare earth elements in addition to Sm, and T essentially includes Fe, or Fe and Co, one or more of transition metal elements in addition to Fe, or Fe and Co). A composition ratio of R in the permanent magnet is 20 at % or more and 40 at % or less. A remaining part is substantially only T, or only T and C. T amount is more than 1.5 times of R amount and less than 4.0 times of the R amount. Main phase grains included in the permanent magnet have an Nd5Fe17 type crystal structure. An average crystal grain size of the main phase grains of the permanent magnet is greater than 1 ?m. A number ratio of main phase grains having a crystal grain size of less than 0.4 ?m is less than 20%.
    Type: Application
    Filed: November 30, 2017
    Publication date: October 31, 2019
    Applicant: TDK CORPORATION
    Inventors: Masashi ITO, Yuki NAGAMINE
  • Patent number: 10453595
    Abstract: A rare earth permanent magnet includes a main phase composed of a main phase particle and a grain boundary present among a plurality of the main phase particles. The grain boundary includes a region whose electric resistance is higher than that of the main phase.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: October 22, 2019
    Assignee: TDK CORPORATION
    Inventors: Tetsuya Hidaka, Yuki Nagamine, Yoshinori Fujikawa
  • Publication number: 20190304640
    Abstract: An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R—O—C—N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R—O—C—N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R—O—C—N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventors: Yuki NAGAMINE, Masashi MIWA, Yoshinori FUJIKAWA
  • Publication number: 20190304638
    Abstract: An R-T-B based permanent magnet excellent in magnetic properties relatively reduces the amount of a heavy rare earth element used. An R-T-B based permanent magnet, wherein R represents a rare earth element, T an iron group element and B boron, includes main phase grains including an R2T14B crystal phase and grain boundaries formed between main phase grains. Grain boundaries include R-O-C-N concentrated parts where concentrations of R, O, C and N are all higher than those in main phase grains. C/R(S)>C/R(C) is satisfied in which C/R(S) represents a C/R ratio (atomic ratio) in R-O-C-N concentrated parts present in a surface of a R-T-B based permanent magnet and C/R(C) represents a C/R ratio (atomic ratio) in the R-O-C-N concentrated parts present in the center of a R-T-B based permanent magnet, and a heavy rare earth element RH is included in the R-T-B based permanent magnet.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventors: Yuki NAGAMINE, Masashi MIWA, Yoshinori FUJIKAWA
  • Publication number: 20190202744
    Abstract: To provide a dielectric porcelain composition and an electronic component that demonstrate ferroelectricity. A dielectric porcelain composition that is characterized by having a perovskite-type oxynitride as a principal component and by including a polycrystalline body that demonstrates ferroelectricity.
    Type: Application
    Filed: February 1, 2017
    Publication date: July 4, 2019
    Applicants: TDK CORPORATION, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Kumiko YAMAZAKI, Yuki NAGAMINE, Takeshi SHIBAHARA, Shinichi KIKKAWA, Yuji MASUBUCHI
  • Publication number: 20190144341
    Abstract: A metal oxynitride thin film having a perovskite structure, in which the metal oxynitride thin film has a composition represented by a compositional formula A1+?BOx+?Ny wherein ? is larger than zero and 0.300 or less, x+? is larger than 2.450, and y is 0.300 or more and 0.700 or less, an AO structure having a layered structure parallel to a plane perpendicular to a c-axis of the perovskite structure and having a composition represented by a general formula AO, and the AO structure is bonded with the perovskite structure and incorporated in the perovskite structure.
    Type: Application
    Filed: November 9, 2018
    Publication date: May 16, 2019
    Applicant: TDK CORPORATION
    Inventors: Kumiko YAMAZAKI, Yuki NAGAMINE, Takeshi SHIBAHARA, Yuji UMEDA, Junichi YAMAZAKI
  • Patent number: 10256016
    Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the main phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 25 to 35% for R, 60 to 70% for T and 2 to 10% for M.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: April 9, 2019
    Assignee: TDK CORPORATION
    Inventors: Yoshinori Fujikawa, Yuki Nagamine, Wakako Okawa, Chikara Ishizaka, Eiji Kato, Katsuo Sato
  • Publication number: 20190023616
    Abstract: A polycrystalline dielectric thin film and capacitor element has a small dielectric loss tan ?. The polycrystalline dielectric thin film, in which the main composition is a perovskite oxynitride. The perovskite oxynitride is expressed by the compositional formula AaBbOoNn (a+b+o+n=5), where a/b>1 and n?0.7.
    Type: Application
    Filed: February 1, 2017
    Publication date: January 24, 2019
    Applicant: TDK CORPORATION
    Inventors: Kumiko YAMAZAKI, Hiroshi CHIHARA, Yuki NAGAMINE, Junichi YAMAZAKI
  • Publication number: 20190019622
    Abstract: A polycrystalline dielectric thin film and a capacitor element have a large relative dielectric constant. The polycrystalline dielectric thin film has a perovskite oxynitride as a principal component. The perovskite oxynitride is represented by compositional formula Aa1Bb1OoNn (a1+b1+o+n=5), and the a-axis length of the crystal lattice of the perovskite oxynitride is larger than a theoretical value.
    Type: Application
    Filed: February 1, 2017
    Publication date: January 17, 2019
    Applicant: TDK CORPORATION
    Inventors: Kumiko YAMAZAKI, Hiroshi CHIHARA, Yuki NAGAMINE, Junichi YAMAZAKI, Yuji UMEDA