Patents by Inventor Noboru Menjo
Noboru Menjo 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: 9266311Abstract: There is provided the manufacturing method of a laminated magnet film end product, including the steps of: a first step of preparing magnet films, each of the magnet films having a thickness of 40 ?m to 300 ?m, and having a nanocrystalline structure which is magnetically isotropic; a second step of applying a self-bonding resin composition with film formability on each of the magnet films so as to prepare a plurality of self-bonding magnet films, each being composed of a magnet film and a self-bonding layer; a third step of mechanically processing each of the plurality of the self-bonding magnet films so as to be solid or hollow disc; a fourth step of preparing a laminated magnet film by laminating the plurality of self-bonding magnetic films; a fifth step of melting each self-bonding layer of the laminated magnet film and then cooling and solidifying each self-bonding layer so as to integrally rigidify the laminated magnet film; and a sixth step of magnetizing the rigidified laminated magnet film.Type: GrantFiled: April 21, 2011Date of Patent: February 23, 2016Assignee: MINEBEA CO., LTD.Inventors: Fumitoshi Yamashita, Shinsaku Nishimura, Noboru Menjo
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Patent number: 8404141Abstract: A rare earth bonded magnet is provided which is produced such that a mixture which comprises: a rare earth magnet powder; a resin binder comprising a thermosetting resin; an organic phosphorus compound; and a coupling agent is compress-molded, heated and cured, wherein the organic phosphorus compound and the coupling agent are represented by the following respective chemical formulas (structural formulas):Type: GrantFiled: March 18, 2010Date of Patent: March 26, 2013Assignee: Minebea Co., Ltd.Inventors: Noboru Menjo, Kinji Uchiyama, Yuki Takeda
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Patent number: 8269391Abstract: A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t1 having an in-plane remanence Mr of 0.95 T or more and a coercivity HcJ of 400 kA/m or more and a non-magnetic material with a thickness t2 adapted to isolate two adjacent isotropic magnets where the ratio of t1/t2 is eight or more and which are stacked on one another in multiple layers in the rotation axis direction, wherein at least two pole pairs are provided and a mean magnetic path of in-plane direction having a permeance (B/?oH) of five or more achieved by the magnet alone is provided, whereby eddy current is reduced. Also disclosed are a radial gap type brushless DC motor, a PM stepping motor and an electric generator which incorporate the above described micro rotor.Type: GrantFiled: June 1, 2010Date of Patent: September 18, 2012Assignee: Minebea Co., Ltd.Inventors: Fumitoshi Yamashita, Shinsaku Nishimura, Noboru Menjo
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Publication number: 20110266894Abstract: There is provided the manufacturing method of a laminated magnet film, including the steps of: a first step of preparing a magnet film, 40 ?m to 300 ?m in thickness, provided with a nanocrystalline structure magnetically isotropic; a second step of applying a self-bonding resin composition with film formability on the magnet film preparing a self-bonding magnet film composed of the magnet film and a self-bonding layer; a third step of mechanically processing the self-bonding magnet film being solid or hollow; a fourth step of preparing the laminated magnet film by laminating the self-bonding magnet films; a fifth step of melting the self-bonding layer of the laminated magnet film and then cooling and solidifying the self-bonding layer to integrally rigidify the laminated magnet film; and a sixth step of magnetizing the rigidified laminated magnet film.Type: ApplicationFiled: April 21, 2011Publication date: November 3, 2011Applicant: MINEBEA CO., LTD.Inventors: Fumitoshi YAMASHITA, Shinsaku NISHIMURA, Noboru MENJO
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Publication number: 20100308679Abstract: A micro rotor is disclosed and includes a plurality of circular or annular plate-shaped thick film magnets which each include an isotropic magnet with a thickness t1 having an in-plane remanence Mr of 0.95 T or more and a coercivity HcJ of 400 kA/m and a non-magnetic material with a thickness t2 adapted to isolate two adjacent isotropic magnets where the ratio of t1/t2 is eight or more and which are stacked on one another in multiple layers in the rotation axis direction, wherein at least two pole pairs are provided and a mean magnetic path of in-plane direction having a permeance (B/?oH) of five or more achieved by the magnet alone is provided, whereby eddy current is reduced. Also disclosed are a radial gap type brushless DC motor, a PM stepping motor and an electric generator which incorporate the above described micro rotor.Type: ApplicationFiled: June 1, 2010Publication date: December 9, 2010Applicant: MINEBEA CO., LTD.Inventors: Fumitoshi YAMASHITA, Shinsaku NISHIMURA, Noboru MENJO
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Publication number: 20100245006Abstract: A rare earth bonded magnet is provided which is produced such that a mixture which comprises: a rare earth magnet powder; a resin binder comprising a thermosetting resin; an organic phosphorus compound; and a coupling agent is compress-molded, heated and cured, wherein the organic phosphorus compound and the coupling agent are represented by the following respective chemical formulas (structural formulas):Type: ApplicationFiled: March 18, 2010Publication date: September 30, 2010Applicant: MINEBEA CO., LTD.Inventors: Noboru Menjo, Kinji Uchiyama, Yuki Takeda
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Publication number: 20090096561Abstract: In order to achieve excellent heat resistance, durability and weatherability for use in an extended range of temperature environments, a rare earth bonded magnet is formed such that a material mixture comprising: a rare earth magnetic powder having a particle diameter ranging from 30 ?m to 500 ?m; a resin binder constituted by a thermosetting resin; and an organic phosphorous compound, is compression-molded and hardened, wherein the organic phosphorous compound is uniformly dispersed in the resin binder.Type: ApplicationFiled: March 26, 2008Publication date: April 16, 2009Applicant: MINEBEA CO., LTD.Inventors: Noboru Menjo, Kinji Uchiyama, Yuki Takeda, Osamu Kobayashi
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Patent number: 7300600Abstract: In a rare earth bonded magnet comprising a mixture of rare earth magnetic powder, thermosetting resin, and lubricant, the lubricant is constituted by amino-acid compound, specifically either N-lauroyl-L-lysine or N-lauroyl-asparaginic acid. The content of the amino-acid compound as lubricant in the mixture is set to range between 0.01 wt % and 1.0 wt % of the magnetic powder. Since the amino-acid compound has a high decomposition point, the resultant magnet after heat-curing treatment has a sufficient mechanical strength. Also, the amino-acid compound is nonhygroscopic, and therefore oxidation resistance and humidity resistance are good enough. Further, since the amino-acid compound produces a small amount of outgas, the resultant magnet can be suitably and reliably used in a hard disk drive which has stringent requirements, especially on outgas.Type: GrantFiled: February 25, 2005Date of Patent: November 27, 2007Assignee: Minebea Co., LtdInventors: Shinsaku Nishimura, Noboru Menjo, Toshihiko Miura
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Publication number: 20050211947Abstract: In a rare earth bonded magnet comprising a mixture of rare earth magnetic powder, thermosetting resin, and lubricant, the lubricant is constituted by amino-acid compound, specifically either N-lauroyl-L-lysine or N-lauroyl-asparaginic acid. The content of the amino-acid compound as lubricant in the mixture is set to range between 0.01 wt % and 1.0 wt % of the magnetic powder. Since the amino-acid compound has a high decomposition point, the resultant magnet after heat-curing treatment has a sufficient mechanical strength. Also, the amino-acid compound is nonhygroscopic, and therefore oxidation resistance and humidity resistance are good enough. Further, since the amino-acid compound produces a small amount of outgas, the resultant magnet can be suitably and reliably used in a hard disk drive which has stringent requirements, especially on outgas.Type: ApplicationFiled: February 25, 2005Publication date: September 29, 2005Applicant: MINEBEA CO., LTD.Inventors: Shinsaku Nishimura, Noboru Menjo, Toshihiko Miura