Patents by Inventor Yoshio Kawashita
Yoshio Kawashita 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: 10325705Abstract: A bond magnet molding is provided that contains coated magnetic particles having at least two layers of an oxide layer of 1-20 nm on a surface of magnetic particles and an organic layer of 1-100 nm on an outer side of the oxide layer. The bond magnet molding preferably includes a Zn alloy as a binder. The Zn alloy has a strain rate sensitivity exponent (m value) of not less than 0.3 and an elongation at break of not less than 50%. The magnet particles have a nitrogen compound containing Sm and Fe that are solidified using the binder at a temperature not higher than a molding temperature.Type: GrantFiled: August 24, 2015Date of Patent: June 18, 2019Assignee: Nissan Motor Co., Ltd.Inventors: Yoshio Kawashita, Masaya Arai, Ryou Murakami, Shinichirou Fujikawa
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Patent number: 10287656Abstract: A rare earth magnet molding (1) of the present invention includes rare earth magnet particles (2), and an insulating phase (3) present among the rare earth magnet particles. Segregation regions (4) in which at least one element selected from the group consisting of Dy, Tb, Pr and Ho is segregated are distributed in the rare earth magnet particles (2). Accordingly, the rare earth magnet molding that has excellent resistance to heat in motor environments or the like while maintaining high magnetic characteristics (coercive force) is provided.Type: GrantFiled: August 4, 2010Date of Patent: May 14, 2019Assignee: NISSAN MOTOR CO., LTD.Inventors: Yoshio Kawashita, Kiyohiro Uramoto, Takashi Miyamoto, Yoshiteru Yasuda
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Publication number: 20180226180Abstract: A bond magnet molding is provided that contains coated magnetic particles having at least two layers of an oxide layer of 1-20 nm on a surface of magnetic particles and an organic layer of 1-100 nm on an outer side of the oxide layer. The bond magnet molding preferably includes a Zn alloy as a binder. The Zn alloy has a strain rate sensitivity exponent (m value) of not less than 0.3 and an elongation at break of not less than 50%. The magnet particles have a nitrogen compound containing Sm and Fe that are solidified using the binder at a temperature not higher than a molding temperature.Type: ApplicationFiled: August 24, 2015Publication date: August 9, 2018Inventors: Yoshio KAWASHITA, Masaya ARAI, Ryou MURAKAMI, Shinichirou FUJIKAWA
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Publication number: 20140349099Abstract: A molded rare-earth magnet which simultaneously satisfies increased film thickness, high density, and improved magnetic properties (in particular, coercive force, residual magnetic flux density, and tight adhesion) has a rare-earth magnet phase that contains as a main component a nitride which contains Sm and Fe, in which the molded rare-earth magnet has a density of 80% or higher of the theoretical density of a molded magnet constituted of the rare-earth magnet phase, and has a structure in which particles of Zn and/or Mn have been dispersed in the molded magnet.Type: ApplicationFiled: November 27, 2012Publication date: November 27, 2014Applicant: Nissan Motor Co., Ltd.Inventors: Yoshio Kawashita, Kazuhiko Takashima, Yoshitaka Uehara, Toshikazu Nanbu, Kiyohiro Uramoto
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Publication number: 20140312523Abstract: A thick magnet film contains a rare earth magnet phase represented by formula R-M-X, where R contains at least one of Nd and Sm, M contains at least one of Fe and Co, and X contains at least one of N and B. The thick magnet film has a density of equal to or more than 80% but less than 95% of the theoretical density when R contains Nd as a main component and has the density of equal to or more than 80% but less than 97% of the theoretical density when R contains Sm as a main component. The magnet can achieve an increase in thickness when formed into a film, an increase in density and an improvement in magnetic properties such as residual magnetic flux density.Type: ApplicationFiled: October 22, 2012Publication date: October 23, 2014Inventors: Yoshio Kawashita, Kazuhiko Takashima, Toshikazu Nanbu
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Patent number: 8692545Abstract: A magnetostrictive stress sensor (11, 12, 13, 14, 15, 16) includes: a magnetic member {20, (107, 108, 109, 110, 111, 112)} having a magnetostriction; a permanent magnet (30, 35, 113) adjacent to the magnetic member; a magnetic sensor (40, 104A, 104B) for detecting a leak magnetic flux on a side opposite to the permanent magnet with respect to the magnetic member, wherein the leak magnetic flux changes according to a stress acting on the magnetic member and the magnetic sensor detects the change of the leak magnetic flux, to thereby detect the stress acting on the magnetic member, and a direction (21, 108A, 109A) of the stress acting on the magnetic member is substantially orthogonal to a magnetizing direction (31, 31, 113A) of the permanent magnet.Type: GrantFiled: February 27, 2008Date of Patent: April 8, 2014Assignee: Nissan Motor Co., Ltd.Inventors: Munekatsu Shimada, Hiroshi Sakurai, Yoshio Kawashita, Kiyohiro Uramoto, Toshimitsu Matsuoka, Masao Aihara, Mitsuaki Fujita, Masaharu Ooshima
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Patent number: 8481179Abstract: This rare earth magnet having high strength and high electrical resistance has a structure including an R—Fe—B-based rare earth magnet particles 18 which are enclosed with a high strength and high electrical resistance composite layer 12. The high strength and high electrical resistance composite layer 12 is constituted from a glass-based layer 16 that has a structure comprising a glass phase or R oxide particles 13 dispersed in glass phase, and R oxide particle-based mixture layers 17 that are formed on both sides of the glass-based layer 16 and contain an R-rich alloy phase 14 which contains 50 atomic % or more of R in the grain boundary of the R oxide particles.Type: GrantFiled: January 28, 2011Date of Patent: July 9, 2013Assignee: Nissan Motor Co., Ltd.Inventors: Katsuhiko Mori, Ryoji Nakayama, Muneaki Watanabe, Koichiro Morimoto, Tetsurou Tayu, Yoshio Kawashita, Makoto Kano
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Publication number: 20120153759Abstract: A rare earth magnet molding (1) of the present invention includes rare earth magnet particles (2), and an insulating phase (3) present among the rare earth magnet particles. Segregation regions (4) in which at least one element selected from the group consisting of Dy, Tb, Pr and Ho is segregated are distributed in the rare earth magnet particles (2). Accordingly, the rare earth magnet molding that has excellent resistance to heat in motor environments or the like while maintaining high magnetic characteristics (coercive force) is provided.Type: ApplicationFiled: August 4, 2010Publication date: June 21, 2012Inventors: Yoshio Kawashita, Kiyohiro Uramoto, Takashi Miyamoto, Yoshiteru Yasuda
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Publication number: 20110128106Abstract: This rare earth magnet having high strength and high electrical resistance has a structure including an R—Fe—B-based rare earth magnet particles 18 which are enclosed with a high strength and high electrical resistance composite layer 12. The high strength and high electrical resistance composite layer 12 is constituted from a glass-based layer 16 that has a structure comprising a glass phase or R oxide particles 13 dispersed in glass phase, and R oxide particle-based mixture layers 17 that are formed on both sides of the glass-based layer 16 and contain an R-rich alloy phase 14 which contains 50 atomic % or more of R in the grain boundary of the R oxide particles.Type: ApplicationFiled: January 28, 2011Publication date: June 2, 2011Applicant: NISSAN MOTOR CO., LTD.Inventors: Katsuhiko Mori, Ryoji Nakayama, Muneaki Watanabe, Koichiro Morimoto, Tetsurou Tayu, Yoshio Kawashita, Makoto Kano
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Patent number: 7919200Abstract: This rare earth magnet having high strength and high electrical resistance has a structure including an R—Fe—B-based rare earth magnet particles 18 which are enclosed with a high strength and high electrical resistance composite layer 12. The high strength and high electrical resistance composite layer 12 is constituted from a glass-based layer 16 that has a structure comprising a glass phase or R oxide particles 13 dispersed in glass phase, and R oxide particle-based mixture layers 17 that are formed on both sides of the glass-based layer 16 and contain an R-rich alloy phase 14 which contains 50 atomic % or more of R in the grain boundary of the R oxide particles.Type: GrantFiled: June 9, 2006Date of Patent: April 5, 2011Assignee: Nissan Motor Co., Ltd.Inventors: Katsuhiko Mori, Ryoji Nakayama, Muneaki Watanabe, Koichiro Morimoto, Tetsurou Tayu, Yoshio Kawashita, Makoto Kano
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Publication number: 20100127698Abstract: A magnetostrictive stress sensor (11, 12, 13, 14, 15, 16) includes: a magnetic member {20, (107, 108, 109, 110, 111, 112)} having a magnetostriction; a permanent magnet (30, 35, 113) adjacent to the magnetic member; a magnetic sensor (40, 104A, 104B) for detecting a leak magnetic flux on a side opposite to the permanent magnet with respect to the magnetic member, wherein the leak magnetic flux changes according to a stress acting on the magnetic member and the magnetic sensor detects the change of the leak magnetic flux, to thereby detect the stress acting on the magnetic member, and a direction (21, 108A, 109A) of the stress acting on the magnetic member is substantially orthogonal to a magnetizing direction (31, 31, 113A) of the permanent magnet.Type: ApplicationFiled: February 27, 2008Publication date: May 27, 2010Inventors: Munekatsu Shimada, Hiroshi Sakurai, Yoshio Kawashita, Kiyohiro Uramoto, Toshimitsu Matsuoka, Masao Aihara, Mitsuaki Fujita, Masaharu Ooshima
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Patent number: 7632360Abstract: A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 ?m, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 ?m.Type: GrantFiled: May 13, 2004Date of Patent: December 15, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Katsuhiko Mori, Ryoji Nakayama, Hideaki Ono, Takae Ono, legal representative, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano, Yoshio Kawashita
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Patent number: 7608153Abstract: A rare earth magnet includes rare earth magnet particles; and amorphous and/or crystalline terbium oxide present at the boundary of the rare earth magnet particles and represented by the formula: TbOn, wherein 1.5<n?2. The rare earth magnet prevents decrease eddy current effectively.Type: GrantFiled: December 21, 2004Date of Patent: October 27, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, legal representative, Yoshio Kawashita, Makoto Kano, Munekatsu Shimada
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Publication number: 20070079904Abstract: A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 ?m, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 ?m.Type: ApplicationFiled: May 13, 2004Publication date: April 12, 2007Inventors: Katsuhiko Mori, Ryoji Nakayama, Hideaki Ono, Tetsurou Tayu, Munekatsu Shimada, Makoto Kano, Yoshio Kawashita
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Publication number: 20060292395Abstract: This rare earth magnet having high strength and high electrical resistance has a structure including an R—Fe—B-based rare earth magnet particles 18 which are enclosed with a high strength and high electrical resistance composite layer 12. The high strength and high electrical resistance composite layer 12 is constituted from a glass-based layer 16 that has a structure comprising a glass phase or R oxide particles 13 dispersed in glass phase, and R oxide particle-based mixture layers 17 that are formed on both sides of the glass-based layer 16 and contain an R-rich alloy phase 14 which contains 50 atomic % or more of R in the grain boundary of the R oxide particles.Type: ApplicationFiled: June 9, 2006Publication date: December 28, 2006Applicants: MITSUBISHI MATERIALS PMG CORPORATION, NISSAN MOTOR CO., LTDInventors: Katsuhiko Mori, Ryoji Nakayama, Muneaki Watanabe, Koichiro Morimoto, Tetsurou Tayu, Yoshio Kawashita, Makoto Kano
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Patent number: 6984271Abstract: A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles. Additionally, a rare earth oxide is present among the rare earth magnet particles, the rare earth oxide being represented by the following general formula (I): R2xR?2(1?x)O3??(I) where each of R and R? is one element selected from the group consisting of yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb) and lutetium (Lu), and 0<x<1.Type: GrantFiled: March 26, 2004Date of Patent: January 10, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Tetsurou Tayu, Takae Ono, legal representative, Makoto Kano, Munekatsu Shimada, Yoshio Kawashita, Takeshi Yamauchi, Hideaki Ono, deceased
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Publication number: 20050133117Abstract: A rare earth magnet includes rare earth magnet particles; and amorphous and/or crystalline terbium oxide present at the boundary of the rare earth magnet particles and represented by the formula: TbOn, wherein 1.5<n?2. The rare earth magnet prevents decrease eddy current effectively.Type: ApplicationFiled: December 21, 2004Publication date: June 23, 2005Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, Yoshio Kawashita, Makoto Kano, Munekatsu Shimada
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Publication number: 20040187963Abstract: A rare earth magnet to be used in a motor. The rare earth magnet comprises rare earth magnet particles.Type: ApplicationFiled: March 26, 2004Publication date: September 30, 2004Applicant: NISSAN MOTOR CO. LTD.Inventors: Tetsurou Tayu, Hideaki Ono, Takae Ono, Makoto Kano, Munekatsu Shimada, Yoshio Kawashita, Takeshi Yamauchi