Patents by Inventor Koichiro Inomata
Koichiro Inomata 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: 4975213Abstract: In a method for producing a resin-bonded rare earth-iron-boron magnet, a powder is subjected to a heat-treatment below its melting point. The powder can be either: (1) a mixture of both: (a) a powder of a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, which stands for at least one selected from the group of Y (yttrium) and rare earth elements, about 2 to about 28 atomic precent of B(boron), and at least 50 atomic percent of Fe(iron) and (b) at least one of the group consisting of R, R-oxides, which are oxides of R, and R-compound, which are the compounds consisting essentially of more than 30 atomic percent of R and the balance substantially of at least one of Fe and Co; or (2) a rare earth-iron-boron magnetic alloy comprising about 8 to about 30 atomic percent of R, about 2 to about 28 atomic percent of B, about 0.1 to about 13 atomic percent of Ga, and at least 50 atomic percent of Fe. The resultant heat-treatment powder is then bonded with a resin.Type: GrantFiled: January 6, 1989Date of Patent: December 4, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Isao Sakai, Akihiko Tsutai, Masashi Sahashi, Tetsuhiko Mizoguchi, Koichiro Inomata
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Patent number: 4935075Abstract: A permanent magnet essentially consists of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 13% by weight or less of gallium and iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements.The magnet having this composition has a high coercive force iHC and a high residual magnetic flux density and therefore has a high maximum energy product.Type: GrantFiled: February 16, 1989Date of Patent: June 19, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Isao Sakai, Hiromi Niu, Koichiro Inomata, Akihiko Tsutai
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Patent number: 4878964Abstract: A permanent magnetic alloy essentially consists of 10 to 40% by weight of R, 0.1 to 0.8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rate-earth elements.An alloy having this composition has a high coercive force .sub.I H.sub.C and a high residual magnetic flux density and therefore has a high maximum energy product.Type: GrantFiled: September 27, 1988Date of Patent: November 7, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Koichiro Inomata, Toru Higuchi, Isao Sakai
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Patent number: 4859254Abstract: A permanent magnet according to the present invention is characterized in that it is composed of an alloy comprising mainly of iron, and R (rare earth element including yttrium), cobalt, and boron, wherein the alloy is formed principally of ferromagnetic Fe-rich phase of tetragonal system and includes a nonmagnetic Laves phase. Compared with the prior rare earth-Fe based magnet, it has higher Curie temperature and has excellent magnetic characteristics, especially the temperature characteristics.Type: GrantFiled: September 10, 1986Date of Patent: August 22, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Isao Sakai, Hiromi Niu, Koichiro Inomata
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Patent number: 4859256Abstract: To obtain a high permeability magnetic core, the core is made of a 5 to 25 .mu.m thick ribbon of a Co-based amorphous alloy with a Curie temperature Tc between 120.degree. C. and 270.degree. C., and further heat treated at a temperature below Tc within a magnetic field (1 Oe or more) applied in the lateral direction of the thin ribbon. Further, the saturation magnetostriction constant of the ribbon should be -2 to 1.times.10.sup.-6.Type: GrantFiled: January 30, 1987Date of Patent: August 22, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Takao Sawa, Susumu Hashimoto, Koichiro Inomata
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Patent number: 4849017Abstract: A magnetic refrigerant for magnetic refrigeration which comprises a sintered body containing at least one of rare earth elements selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and yttrium and a balance consisting essentially of at least one of aluminum, nickel and cobalt.This invention provides sintered magnetic bodies which are suited for use as magnetic refrigerants, and also provides significant contribution to the performance improvement of magnetic refrigerators and to the materialization of regenerator-type magnetic refrigerants.Type: GrantFiled: January 30, 1986Date of Patent: July 18, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Masashi Sahashi, Koichiro Inomata
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Patent number: 4827235Abstract: A magnetic field generator comprises a permanent magnet, and pole pieces magnetically connected to the permanent magnet. The pole pieces are disposed to face each other to generate a magnetic field between them, and have a specific resistance of 20 .mu..OMEGA.-cm or more. The permanent magnet comprises a sintered alloy including iron as a main component, a rare earth element including yttrium, cobalt, and boron. The permanent magnet includes, as its main part, a strong magnetic Fe-rich phase of a tetragonal system, as well as a non-magnetic Laves phase, and preferably has a maximum energy product of 38 MGOe or more.Type: GrantFiled: July 14, 1987Date of Patent: May 2, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Koichiro Inomata, Tetsuhiko Mizoguchi, Naoyuki Sori, Hideki Yamamiya, Isao Sakai
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Patent number: 4793874Abstract: A permanent magnetic alloy essentially consists of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements.An alloy having this composition has a high coercive force .sub.I H.sub.C and a high residual magnetic flux density and therefore has a high maximum energy product.Type: GrantFiled: February 6, 1987Date of Patent: December 27, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Koichiro Inomata, Toru Higuchi, Isao Sakai
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Patent number: 4762008Abstract: A torque detecting apparatus utilizing a magnetoelastic effect comprising one or more pairs of thin magnetic metal strips affixed to a torque-transmitting shaft subjected to torque detection and having magnetic anisotropy induced in a predetermined direction, and one or more pairs of detecting cores paired with the above one or more pairs of thin magnetic metal strips, fixed in contact with the thin magnetic metal strips, each of the cores of the one or more pairs of detecting cores having a detecting coil wound therearound, In one embodiment, the torque detecting apparatus utilizes a magnetoelastic effect of thin magnetic metal strip wherein the absolute value of saturated magnetostriction constant .lambda.s of the thin magnetic metal strip is less than 1.times.10.sup.-6.Type: GrantFiled: March 30, 1987Date of Patent: August 9, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Tadahiko Kobayashi, Masashi Sahashi, Koichiro Inomata
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Patent number: 4750371Abstract: A torque sensor of noncontact type, by which can be stably measured the torque of a shaft with a sufficient S/N ratio under the influence of external magnetic noise, such as an induction magnetic flux which is produced in an induction motor, and which can be readily disposed in a comparatively small space. When provided on an induction motor, the torque sensor is mounted on the induction motor in noncontacting relationship. The torque sensor detects the torque of the shaft and includes a pair of magnetic material members provided on respective circumferential portions of the peripheral surface of a shaft. A pair of magnetic detectors are disposed at opposite locations at which external magnetic fields having opposite phase exist. The detectors detect the variation of the magnetic characteristics of the magnetic materials, and a signal processing circuit produces a mean value of output signals obtained from the magnetic detectors.Type: GrantFiled: September 30, 1986Date of Patent: June 14, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Tadahiko Kobayashi, Masashi Sahashi, Koichiro Inomata, Tomokazu Domon
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Patent number: 4664724Abstract: A permanent magnetic alloy essentially consists of 10 to 40% by weight of R, 0.1 to 8% by weight of boron, 50 to 300 ppm by weight of oxygen and the balance of iron, where R is at least one component selected from the group consisting of yttrium and the rare-earth elements.An alloy having this composition has a high coercive force .sub.I H.sub.C and a high residual magnetic flux density and therefore has a high maximum energy product.Type: GrantFiled: September 9, 1985Date of Patent: May 12, 1987Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Koichiro Inomata, Toru Higuchi, Isao Sakai
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Patent number: 4631796Abstract: There are disclosed a torque sensor having a rotary shaft and a thin strip of an amorphous magnetic alloy which has a great magnetic strain constant windingly fixed on the rotary shaft and detecting a torque in a non-contact style by a variation in magnetic properties of the thin strip of the amorphous alloy, characterized in that the amorphous alloy is an iron-based amorphous alloy having a crystallization temperature of 450.degree. C. or more, and a method for manufacturing the same, characterized in that an inductive magnetic anisotropy had been previously given to the thin strip and then the thin strip is windingly fixed on the rotary shaft.The torque sensor according to the present invention permits measuring a large torque with a good accuracy in an extensive temperature, and is manufactured with ease.Type: GrantFiled: September 29, 1983Date of Patent: December 30, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Koichiro Inomata, Takao Sawa, Osamu Arakawa
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Patent number: 4627298Abstract: In a torque sensor of a noncontact type for sensing a rotary torque applied to a shaft, a magnetic ribbon of a film shape formed of a magnetic material and applied in advance with an induced magnetic anisotropy in the direction of an angle .theta. along the circumference of a shaft is bonded to the shaft along its circumference. A U-shaped first core member having end faces opposite to the ribbons is provided in the vicinity of the shaft. An exciting coil for producing a magnetic flux and a detecting coil are wound around the core member, and the magnetic flux produced by the exciting coil and introduced through the ribbon to the core member is detected by the detecting coil. When an exciting current of a predetermined frequency is supplied from an oscillator to the exciting coil to produce a magnetic flux, an output signal is generated from the detecting coil and is measured by a voltmeter.Type: GrantFiled: August 24, 1984Date of Patent: December 9, 1986Assignee: Kabushiki Kaisha ToshibaInventors: Masashi Sahashi, Koichiro Inomata, Tadahiko Kobayashi
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Patent number: 4590807Abstract: In a torque sensor of a noncontact type for sensing a torque applied to a shaft, a magnetic ribbon is bonded to a circumferential portion of the peripheral surface of the shaft, and a core member made of a magnetic material is arranged above the shaft surface so that its end faces are faced to the magnetic ribbon. A exciting coil and a detecting coil wound around the core so that a magnetic flux produced by the exciting coil and delivered to the detecting coil is detected by the detecting coil. The magnetic ribbon has a length L0 equal to or smaller than one half of the circumferential length Ls of the shaft 4 and satisfying an inequality given byL1.ltoreq.L0.ltoreq.2L1where L1 is the center-to-center distance between the end faces of the core.Type: GrantFiled: December 17, 1984Date of Patent: May 27, 1986Assignee: Kabushiki Kaisha ToshibaInventors: Tadahiko Kobayashi, Masashi Sahashi, Koichiro Inomata, Tomokazu Domon, Hironori Fukuda
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Patent number: 4578125Abstract: Disclosed is a comprising a powdered alloy composed of 23 to about 29% by weight of samarium, 0.2 to about 7% by weight of titanium, 3 to about 9% by weight of copper, 10 to about 25% by weight of iron, and the balance of cobalt principally; said powdered alloy being sintered to obtain a sintered body, followed by(a) annealing the sintered body at a cooling rate of not more than 5.degree. C./min from an annealing-initiating temperature of from 600.degree. to 900.degree. C., or(b) subjecting the sintered body to a multi-stepwise aging processing initiated from a higher temperature to a lower temperature within the temperature range of from 350.degree. to 900.degree. C.The magnet is excellent in all the magnetic properties such as residual magnetic flux density, coercive force and maximum energy product, and also excellent in antioxidation property.Type: GrantFiled: June 28, 1982Date of Patent: March 25, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Masashi Sahashi, Koichiro Inomata, Naoyuki Sori, Hideki Yamamiya
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Patent number: 4569775Abstract: A method for preparing a magnetic powder for high density magnetic recording includes melting a mixture containing the fundamental component of a hexagonal ferrite, a substituting component for reducing the coercive force, and boron trioxide as a glass forming substance in predetermined amounts. The resultant molten material is rapidly cooled to obtain an amorphous body which is then heat-treated to produce desired substituted type hexagonal ferrite particles in the glass matrix.Type: GrantFiled: September 8, 1982Date of Patent: February 11, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Osamu Kubo, Tadashi Ido, Tutomu Nomura, Koichiro Inomata
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Patent number: 4537517Abstract: A detector is disclosed including a temperature sensitive amorphous magnetic alloy which shows a Curie point of not higher than 200.degree. C. and whose composition is represented by the formula:(M.sub.1-a Ni.sub.a).sub.100-z X.sub.zwherein M=Co or Fe; X=at least one of P, B, C and Si; 0.2.ltoreq.a.ltoreq.0.8 when M is Co, or 0.4.ltoreq.a.ltoreq.0.9 when M is Fe; and 15.ltoreq.z.ltoreq.30.Type: GrantFiled: October 18, 1983Date of Patent: August 27, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Koichiro Inomata, Shinichi Murata
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Patent number: 4517017Abstract: Disclosed is a temperature sensitive amorphous magnetic alloy which shows a Curie point of not higher than 200.degree. C. and whose composition is represented by the formula:(M.sub.1-a Ni.sub.a).sub.100-z X.sub.zwhereinM=Co or Fe;X=at least one of P, B, C and Si;0.2.ltoreq.a.ltoreq.0.8 when M is Co, or 0.4.ltoreq.a.ltoreq.0.9 when M is Fe; and15.ltoreq.z.ltoreq.30.Type: GrantFiled: February 8, 1982Date of Patent: May 14, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Koichiro Inomata, Shinichi Murata
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Patent number: 4504327Abstract: There are disclosed a corrosion-resistant and wear-resistant magnetic amorphous alloy characterized by having, on the surface thereof, an oxide layer including a crystalline oxide and a method for preparing the same characterized by carrying out the oxidation treatment of the magnetic amorphous alloy at a high temperature and at a high pressure in order to form an oxide layer including a crystalline oxide on the surface of the magnetic amorphous alloy.The magnetic amorphous alloy according to this invention possesses a remarkable corrosion resistance and wear resistance and had an improved magnetic permeability in the mega-Hertz zone.Type: GrantFiled: August 1, 1983Date of Patent: March 12, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Koichiro Inomata, Hiroshi Tateishi, Emiko Higashinakagawa, Kanemitsu Sato
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Patent number: 4473417Abstract: There is disclosed an amorphous alloy for a magnetic core material represented by the formula(Co.sub.1-x.sbsb.1.sub.-x.sbsb.2 Fe.sub.x.sbsb.1 M.sub.x.sbsb.2).sub.x.sbsb.3 B.sub.x.sbsb.4 Si.sub.100-x.sbsb.3.sub.-x.sbsb.4wherein M is at least one element selected from the group consisting of Ti, V, Cr, Mn, Ni, Zr, Nb, Mo, Ru, Hf, Ta, W and Re, and x.sub.1, x.sub.2, x.sub.3 and x.sub.4 are numbers which satisfy relations of 0.ltoreq.x.sub.1 .ltoreq.0.10, 0.ltoreq.x.sub.2 .ltoreq.0.10, 70.ltoreq.x.sub.3 .ltoreq.79 and 5.ltoreq.x.sub.4 .ltoreq.9, respectively.According to the present invention, it could be provided an amorphous alloy suitable for a magnetic core material of a magnetic amplifier in which its coercive force is as low as 0.4 oersted or less at a high frequency of 20 KHz or more, particularly even at 50 KHz, and its rectangular ratio is as much as 85% or more.Type: GrantFiled: August 6, 1982Date of Patent: September 25, 1984Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Koichiro Inomata, Michio Hasegawa, Masakatsu Haga, Takao Sawa