Patents by Inventor Teruhiko Fujiwara
Teruhiko Fujiwara 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: 20240047104Abstract: A permanent magnet having excellent magnetic properties and a device including such a permanent magnet are provided. A permanent magnet consists of a sintered compact having a composition consisting of R: 23 to 27 wt % (R is a sum total of rare-earth elements including at least Sm), Fe: 22 to 27 wt %, Mn: 0.3 to 2.5 wt %, Cu: 4.0 to 5.0 wt %, and a remainder consisting of Co and unavoidable impurities, in which the sintered compact contains a plurality of crystal grains and grain boundary phases, and a concentration of Cu in at least a part of the grain boundary phases is 45 at % or higher.Type: ApplicationFiled: July 18, 2023Publication date: February 8, 2024Inventors: Masaaki TAKEZAWA, Hiroaki MACHIDA, Teruhiko FUJIWARA, Hirokazu MAKUTA
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Publication number: 20230095210Abstract: A permanent magnet having excellent magnetic properties, and a device including such a permanent magnet are provided. A permanent magnet consists of a sintered compact having a composition consisting of, in a mass percentage composition, R: 23 to 27% (R is a rare-earth element including at least Sm); Fe: 22 to 27%; Mn: 0.01 to 2.5%; and a remainder consisting of Co and unavoidable impurities, in which the sintered compact contains a plurality of crystal grains and grain boundaries, an average crystal grain size (A. G.) of the crystal grains is equal to or larger than 100 ?m, and a coefficient of variation (C. V.) of crystal grain sizes is equal to or smaller than 0.60.Type: ApplicationFiled: September 26, 2022Publication date: March 30, 2023Inventors: Hiroaki MACHIDA, Teruhiko FUJIWARA, Hirokazu MAKUTA
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Patent number: 11380465Abstract: A rare-earth cobalt permanent magnet with good magnetic properties is provided. A rare-earth cobalt permanent magnet contains 23 to 27 mass % R, 3.5 to 5.0 mass % Cu, 18 to 25 mass % Fe, 1.5 to 3.0 mass % Zr in mass and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare-earth cobalt permanent magnet has a metal structure including a plurality of crystal grains and a continuously extending grain boundary. A content of Cu in the grain boundary is higher than a content of Cu in the crystal grains, and a content of Zr in the grain boundary is higher than a content of Zr in the crystal grains.Type: GrantFiled: October 7, 2016Date of Patent: July 5, 2022Assignees: KYUSHU INSTITUTE OF TECHNOLOGY, TOKIN CorporationInventors: Masaaki Takezawa, Teruhiko Fujiwara, Hiroaki Machida, Hideyuki Yoshikawa
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Publication number: 20210249165Abstract: A rare-earth cobalt permanent magnet having excellent magnetic characteristics, a method for manufacturing such a rare-earth cobalt permanent magnet, and a device including such a rare-earth cobalt permanent magnet are provided. A rare-earth cobalt permanent magnet consisting of 23 to 27 mass % of a rare-earth element R including Sm, 4.0 to 5.0 mass % of Cu, 22 to 27 mass % of Fe, 1.7 to 2.5 mass % of Zr, and a remainder consisting of Co and unavoidable impurities, in which the rare-earth cobalt permanent magnet includes a plurality of crystal grains and grain boundary parts, and a size of a cell structure constituting the crystal grain is 100 to 600 nm.Type: ApplicationFiled: January 27, 2021Publication date: August 12, 2021Inventors: Hiroaki MACHIDA, Teruhiko FUJIWARA, Hirokazu MAKUTA, Chieko FUJIMOTO, Yu KANAMORI
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Publication number: 20210241948Abstract: A rare-earth cobalt permanent magnet having excellent magnetic characteristics, a method for manufacturing such a rare-earth cobalt permanent magnet, and a device are provided. A rare-earth cobalt permanent magnet consists of, when a rear-earth element including at least Sm is represented by R, 23 to 27 mass % of R, 1.0 to 5.0 mass % of Cu, 18 to 25 mass % of Fe, 1.5 to 3.0 mass % of Zr, and a remainder consisting of Co and unavoidable impurities, in which the rare-earth cobalt permanent magnet includes a plurality of crystal grains and grain boundary parts, and a concentration of Cu is at least two times a concentration of Zr in the grain boundary parts.Type: ApplicationFiled: January 11, 2021Publication date: August 5, 2021Inventors: Hirokazu MAKUTA, Hiroaki MACHIDA, Teruhiko FUJIWARA, Yu KANAMORI
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Patent number: 10984932Abstract: An amorphous soft magnetic alloy of the formula (Fe1-?TM?)100-w-x-y-zPwBxLySiz TipCqMnrCus, wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0???0.3, 2?w?18 at %, 2?x?18 at %, 15?w+x?23 at %, 1<y?5 at %, 0?z?4 at %; p, q, r, and s represents an addition ratio such that the total mass of Fe, TM, P, B, L and Si is 100, and 0?p?0.3, 0?q?0.5, 0?r?2, 0?s?1 and r+s>0; the composition fulfills one of the following conditions: L is Cr, Zr, Mo or Nb; or L is a combination of Al and Cr, Zr, Mo or Nb, wherein 0<Al?5 at %, 1?Cr?4 at %, 0<Zr?5 at %, 2?Mo?5 at %, and 2?Nb?5 at %; the alloy has a crystallization start temperature (Tx) which is 550° C. or less, a glass transition temperature (Tg) which is 520° C. or less, and a supercooled liquid region represented by ?Tx=Tx?Tg, which is 20° C. or more.Type: GrantFiled: June 19, 2017Date of Patent: April 20, 2021Assignees: TOKIN CORPORATION, TOHOKU UNIVERSITYInventors: Akiri Urata, Teruhiko Fujiwara, Hiroyuki Matsumoto, Yasunobu Yamada, Akihisa Inoue
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Publication number: 20200365301Abstract: A rare-earth cobalt permanent magnet according to the present disclosure comprises: 24 to 26 mass % of a rare-earth element R including Sm; 25 to 27 mass % of Fe; 4.0 to 7.0 mass % of Cu; 2.0 to 3.5 mass % of Zr; and Co and an unavoidable impurity as a remainder. The rare-earth element R is any one of a combination of Sm and Nd, a combination of Sm and Pr, or a combination of Sm, Nd, and Pr. The rare-earth cobalt permanent magnet includes a cell phase that includes a crystalline phase of a Th2Zn17 structure and a cell wall that includes a crystalline phase of an RCo5 structure enclosing the cell phase, and the concentration of the rare-earth element R in the cell wall is higher than the concentration of the rare-earth element R in the cell phase by no less than 25 atomic %.Type: ApplicationFiled: May 14, 2020Publication date: November 19, 2020Inventors: Masaaki TAKEZAWA, Hiroaki MACHIDA, Teruhiko FUJIWARA, Yu KANAMORI
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Publication number: 20200243232Abstract: A rare-earth cobalt permanent magnet with good magnetic properties is provided. A rare-earth cobalt permanent magnet contains 23 to 27 mass % R, 3.5 to 5.0 mass % Cu, 18 to 25 mass % Fe, 1.5 to 3.0 mass % Zr in mass and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare-earth cobalt permanent magnet has a metal structure including a plurality of crystal grains and a continuously extending grain boundary. A content of Cu in the grain boundary is higher than a content of Cu in the crystal grains, and a content of Zr in the grain boundary is higher than a content of Zr in the crystal grains.Type: ApplicationFiled: October 7, 2016Publication date: July 30, 2020Inventors: Masaaki TAKEZAWA, Teruhiko FUJIWARA, Hiroaki MACHIDA, Hideyuki YOSHIKAWA
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Patent number: 10497496Abstract: There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 18 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. It has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase (11) and containing SmCo5 phase.Type: GrantFiled: September 4, 2015Date of Patent: December 3, 2019Assignee: TOKIN CORPORATIONInventors: Hiroaki Machida, Teruhiko Fujiwara, Hideyuki Yoshikawa
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Publication number: 20170294254Abstract: An amorphous soft magnetic alloy of the formula (Fe1-?TM?)100-w-x-y-zPwBxLySiz TipCqMnrCus, wherein TM is Co or Ni; L is Al, Cr, Zr, Mo or Nb; 0???0.3, 2?w?18 at %, 2?x?18 at %, 15?w+x?23 at %, 1<y?5 at %, 0?z?4 at %; p, q, r, and s represents an addition ratio such that the total mass of Fe, TM, P, B, L and Si is 100, and 0?p?0.3, 0?q?0.5, 0?r?2, 0?s?1 and r+s>0; the composition fulfills one of the following conditions: L is Cr, Zr, Mo or Nb; or L is a combination of Al and Cr, Zr, Mo or Nb, wherein 0<Al?5 at %, 1?Cr?4 at %, 0<Zr?5 at %, 2?Mo?5 at %, and 2?Nb?5 at %; the alloy has a crystallization start temperature (Tx) which is 550° C. or less, a glass transition temperature (Tg) which is 520° C. or less, and a supercooled liquid region represented by ?Tx=Tx?Tg, which is 20° C. or more.Type: ApplicationFiled: June 19, 2017Publication date: October 12, 2017Applicants: TOKIN CORPORATION, TOHOKU UNIVERSITYInventors: Akiri URATA, Teruhiko FUJIWARA, Hiroyuki MATSUMOTO, Yasunobu YAMADA, Akihisa INOUE
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Publication number: 20150380134Abstract: There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 18 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. It has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase (11) and containing SmCo5 phase.Type: ApplicationFiled: September 4, 2015Publication date: December 31, 2015Inventors: Hiroaki MACHIDA, Teruhiko FUJIWARA, Hideyuki YOSHIKAWA
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Publication number: 20150262740Abstract: There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 19 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. The rare earth-cobalt permanent magnet has a density of 8.15 to 8.39 g/cm3. It also has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase and containing SmCo5 phase. An average crystal grain diameter is within a range of 40 to 100 ?m. A half width of Cu content of the cell wall (12) is 10 nm or less.Type: ApplicationFiled: March 10, 2015Publication date: September 17, 2015Inventors: Teruhiko FUJIWARA, Hiroaki MACHIDA, Hideyuki YOSHIKAWA
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Patent number: 7714683Abstract: An inductance device comprises a magnetic core, a coil a conductor and a dielectric member. The coil is made of turns of insulated conductive wire. The conductor is distinct from the coil and is insulated from the magnetic core. The dielectric member is disposed between the conductor and the coil. The dielectric member, the conductor and the coil constitute a capacitor. The inductance device is used in, for example, a filter device or a noise filter.Type: GrantFiled: October 9, 2007Date of Patent: May 11, 2010Assignee: NEC TOKIN CorporationInventors: Masahiko Takahashi, Hiroshi Ono, Satoshi Arai, Teruhiko Fujiwara
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Patent number: 7695023Abstract: A rotating table provided with a determined gap Db and serving as a rotating body is rotatably mounted on a fixed base. Seal-member accommodating spaces serving as annular grooves are partitioned and formed in a fixed surface. Annular seal members are disposed in the seal-member accommodating spaces. When a vacuum is supplied to a communication passage, the absorbed seal members contact with the fixed surface and a rotated surface to seal gaps therebetween. When a positive pressure is supplied to the communication passage, the seal members are relocated in the seal-member accommodating spaces. The seal-member accommodating space has a taper portion, thereby preventing the seal members from biting. While the rotating table is being rotatably driven, no vacuum is supplied to the communication passage.Type: GrantFiled: February 10, 2004Date of Patent: April 13, 2010Assignee: Koganei CorporationInventor: Teruhiko Fujiwara
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Patent number: 7531050Abstract: A viscous material (4) is obtained by mixing an alloy magnetic powder, magnetized in advance, with a resin. The viscous material (4) thus obtained is applied to an upper surface of a center magnetic leg of an E-shaped core (2). A coil (3) and an I-shaped core are coupled to the E-shaped core (2). An orientation magnetic field is applied by a permanent magnet (5) while the resin is hardened. As a consequence, a bond magnet is obtained which is formed in tight contact with both of a pair of surfaces defining a magnetic gap between the E-shaped core (2) and the I-shaped core.Type: GrantFiled: September 19, 2003Date of Patent: May 12, 2009Assignee: Nec Tokin CorporationInventors: Shigun Oh, Teruhiko Fujiwara, Yasubumi Kikuchi, Takashi Yambe
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Publication number: 20080084254Abstract: An inductance device comprises a magnetic core, a coil a conductor and a dielectric member. The coil is made of turns of insulated conductive wire. The conductor is distinct from the coil and is insulated from the magnetic core. The dielectric member is disposed between the conductor and the coil. The dielectric member, the conductor and the coil constitute a capacitor. The inductance device is used in, for example, a filter device or a noise filter.Type: ApplicationFiled: October 9, 2007Publication date: April 10, 2008Applicant: NEC TOKIN CorporationInventors: Masahiko Takahashi, Hiroshi Ono, Satoshi Arai, Teruhiko Fujiwara
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Publication number: 20080012304Abstract: A rotating table provided with a determined gap Db and serving as a rotating body is rotatably mounted on a fixed base. Seal-member accommodating spaces serving as annular grooves are partitioned and formed in a fixed surface. Annular seal members are disposed in the seal-member accommodating spaces. When a vacuum is supplied to a communication passage, the absorbed seal members contact with the fixed surface and a rotated surface to seal gaps therebetween. When a positive pressure is supplied to the communication passage, the seal members are relocated in the seal-member accommodating spaces. The seal-member accommodating space has a taper portion, thereby preventing the seal members from biting. While the rotating table is being rotatably driven, no vacuum is supplied to the communication passage.Type: ApplicationFiled: February 10, 2004Publication date: January 17, 2008Applicant: Koganei CorporationInventor: Teruhiko Fujiwara
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Publication number: 20070175545Abstract: To provide an amorphous soft magnetic alloy having a supercooled liquid region and excellent in amorphous-forming ability and soft magnetic properties, by selecting and optimizing an alloy composition, and to further provide a ribbon, a powder, a high-frequency magnetic core, and a bulk member each using such an amorphous soft magnetic alloy. The amorphous soft magnetic alloy has a composition expressed by a formula of (Fe1-?TM?)100-w-x-y-zPwBxLySiz, wherein unavoidable impurities are contained, TM is at least one selected from Co and Ni, L is at least one selected from the group consisting of Al, V, Cr, Y, Zr, Mo, Nb, Ta, and W, 0??0.98, 2?w?16 at %, 2?x?16 at %, 0<y?10 at %, and 0?z?8 at %).Type: ApplicationFiled: February 1, 2007Publication date: August 2, 2007Applicants: NEC TOKIN Corporation, TOHOKU UNIVERSITYInventors: Akiri Urata, Teruhiko Fujiwara, Hiroyuki Matsumoto, Yasunobu Yamada, Akihisa Inoue
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Patent number: 7170378Abstract: A high-frequency core is a molded body obtained by molding a mixture of a soft magnetic metallic glass powder and a binder in an amount of 10% or less in mass ratio. The powder has an alloy composition represented by a general formula (Fe1-a-bNiaCob)100-x-y-z(M1-pM?p)xTyBz (where 0?a?0.30, 0?b?0.50, 0?a+b?0.50, 0?p?0.5, 1 atomic %?x?5 atomic %, 1 atomic %?y?12 atomic %, 12 atomic %?z?25 atomic %, 22?(x+y+z)?32, M being at least one selected from Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, and W, M? being at least one selected from Zn, Sn, R (R being at least one element selected from rare earth metals including Y), T being at least one selected from Al, Si, C, and P). An inductance component includes the high-frequency core and at least one turn of winding wound around the core.Type: GrantFiled: August 20, 2004Date of Patent: January 30, 2007Assignees: NEC Tokin CorporationInventors: Teruhiko Fujiwara, Akiri Urata, Akihisa Inoue
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Publication number: 20060280921Abstract: A viscous material (4) is obtained by mixing an alloy magnetic powder, magnetized in advance, with a resin. The viscous material (4) thus obtained is applied to an upper surface of a center magnetic leg of an E-shaped core (2). A coil (3) and an I-shaped core are coupled to the E-shaped core (2). An orientation magnetic field is applied by a permanent magnet (5) while the resin is hardened. As a consequence, a bond magnet is obtained which is formed in tight contact with both of a pair of surfaces defining a magnetic gap between the E-shaped core (2) and the I-shaped core.Type: ApplicationFiled: September 19, 2003Publication date: December 14, 2006Inventors: Shigun Oh, Teruhiko Fujiwara, Yasubumi Kikuchi, Takashi Yambe