Patents by Inventor Masahiro Mita
Masahiro Mita 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: 10044251Abstract: An object is to provide a linear motor in which even when the overall length of the linear motor is long, the amount of magnets to be employed does not increase and hence size reduction and weight reduction of a stator is realized.Type: GrantFiled: March 17, 2014Date of Patent: August 7, 2018Assignee: Hitachi Metals, Ltd.Inventors: Masahiro Masuzawa, Masahiro Mita
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Patent number: 9755552Abstract: A frequency converter includes: a primary winding 12 in which a plurality of windings on which a polyphase alternating voltage is applied are arranged periodically along a particular direction; a secondary winding 22 which is magnetically coupled to the primary winding 12 and in which a plurality of windings are arranged along the particular direction with a repetition period different from the primary winding 12; and a frequency modulation part 3 which is arranged on a magnetic path between the primary winding 12 and the secondary winding 22 and in which a plurality of magnetic materials 31 are arranged periodically. Then, the pitch of the plurality of magnetic materials 31 and the winding arrangement period of the primary winding 12 and the secondary winding 22 are different from each other so that an alternating voltage having a frequency different from the frequency of the polyphase alternating voltage is induced in the secondary winding 22.Type: GrantFiled: March 22, 2013Date of Patent: September 5, 2017Assignee: Hitachi Metals, Ltd.Inventor: Masahiro Mita
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Patent number: 9729040Abstract: The magnetic gear device is equipped with a first magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in a specific direction; a second magnet row which is opposed to the first magnet row and in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in the specific direction at a pitch shorter (or longer) than that of the first magnet row; and a magnetic body row which is disposed between the first magnet row and the second magnet row and in which a plurality of magnetic bodies are arranged at substantially equal intervals in the specific direction, wherein a distance between the plurality of magnetic bodies and the second magnet row in the opposing direction is shorter (or longer) than a distance between the plurality of magnetic bodies and the first magnet row.Type: GrantFiled: June 27, 2012Date of Patent: August 8, 2017Assignee: Hitachi Metals, Ltd.Inventors: Junichi Sutani, Hiromitsu Ohhashi, Masahiro Mita
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Patent number: 9580797Abstract: A racetrack-shaped magnetic-field-generating apparatus for magnetron sputtering comprising a linear portion and corner portions, the linear portion comprising a magnetic base, a center permanent magnet disposed on its surface, and side permanent magnets disposed on both sides thereof with a gap; the center and side permanent magnets being vertically magnetized with opposite polarities; the corner portions comprising a non-magnetic base, a center magnetic pole member disposed on its surface, a semicircular or semi-polygonal, peripheral magnetic pole member, and plural permanent magnets arranged between both magnetic pole members with their magnetization directions in parallel to a target surface; and the magnetic poles of plural permanent magnets opposing the center magnetic pole member having the same polarity as those of the center permanent magnet opposing the target.Type: GrantFiled: January 12, 2012Date of Patent: February 28, 2017Assignee: HITACHI METALS, LTD.Inventors: Yoshihiko Kuriyama, Masahiro Mita
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Publication number: 20160301294Abstract: An object is to provide a linear motor in which even when the overall length of the linear motor is long, the amount of magnets to be employed does not increase and hence size reduction and weight reduction of a stator is realized.Type: ApplicationFiled: March 17, 2014Publication date: October 13, 2016Inventors: Masahiro Masuzawa, Masahiro Mita
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Patent number: 9273557Abstract: Provided is a motor device capable of suppressing undesired vibrations occurring at the time of starting a motor, by canceling a torque in a motor device system so as to reduce a reaction torque acting on a motor base. The motor device is equipped with a dual axis motor having first and second rotating shafts and projecting at either end, a rotational direction converter having an input shaft to which the torque of the dual axis motor is inputted and an output shaft that outputs the torque by rotating in a direction opposite to that of the input shaft, and a flywheel provided at an end portion of the first rotating shaft, for balancing out the reaction torque acting on the input shaft and the output shaft of the rotational direction converter when the dual axis motor rotates.Type: GrantFiled: February 2, 2012Date of Patent: March 1, 2016Assignee: Hitachi Metals, Ltd.Inventor: Masahiro Mita
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Publication number: 20160006335Abstract: Provided is a magnetic gear device capable of improving the forces transmitted between a first magnet row and a magnetic body row and between a second magnet row and the magnetic body row.Type: ApplicationFiled: December 28, 2013Publication date: January 7, 2016Applicant: HITACHI METALS, LTD.Inventors: Hiromitsu OHHASHI, Junichi SUTANI, Masahiro MITA
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Patent number: 9166464Abstract: A magnetic gear device including: an internal rotor and an external rotor in which a plurality of magnetic pole pairs are each placed in a circumferential direction substantially at equal intervals; and a holding member that is placed between the internal rotor and the external rotor and holds a plurality of magnetic materials in the circumferential direction substantially at equal intervals, wherein the number of magnetic materials is a difference between or a total of the numbers of magnetic pole pairs, the holding member includes a plurality of circular rings that hold the magnetic materials, and connecting rods that are placed in the circumferential direction substantially at equal intervals and connect the plurality of circular rings, the plurality of circular rings face each other via the magnetic materials, and each number of magnetic pole pairs is set to have the number of connecting rods as a divisor.Type: GrantFiled: June 20, 2011Date of Patent: October 20, 2015Assignee: Hitachi Metals, Ltd.Inventor: Masahiro Mita
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Publication number: 20150043264Abstract: A frequency converter is provided that has high reliability, low electromagnetic noise, and a high efficiency. A frequency converter includes: a primary winding 12 in which a plurality of windings on which a polyphase alternating voltage is applied are arranged periodically along a particular direction; a secondary winding 22 which is magnetically coupled to the primary winding 12 and in which a plurality of windings are arranged along the particular direction with a repetition period different from the primary winding 12; and a frequency modulation part 3 which is arranged on a magnetic path between the primary winding 12 and the secondary winding 22 magnetically coupled to each other and in which a plurality of magnetic materials 31 are arranged periodically along the particular direction.Type: ApplicationFiled: March 22, 2013Publication date: February 12, 2015Inventor: Masahiro Mita
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Publication number: 20150035388Abstract: An object is to provide a linear motor in which even when the moving range of a movable element is long, the quantity of magnets to be employed is not increased. A linear motor comprising; a movable element is in a plurality of magnets and armature cores linked alternately along a moving direction are arranged in the inside of a coil and then adjacent magnets with an armature core in between are magnetized in opposite directions; the stator includes two opposite plate-shaped parts elongated in the moving direction of the movable element and linked magnetically; in each of opposite faces of the two plate-shaped parts, tooth parts composed of magnetic material having a substantially rectangular parallelepiped shape similar to a bar shape are arranged at given intervals; and the movable element moves along an arrangement direction of the tooth parts between the two opposite plate-shaped parts.Type: ApplicationFiled: February 12, 2013Publication date: February 5, 2015Inventors: Masahiro Mita, Masahiro Masuzawa, Makoto Kawakami
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Patent number: 8847839Abstract: A resonance-type, receiving antenna comprising a circular-ring-shaped, magnetic core constituting a closed magnetic path having one gap, one or more coils wound around the circular-ring-shaped, magnetic core, and a capacitor connected in parallel to both ends of each coil; an angle between a straight line extending from a geographical center of the circular-ring-shaped, magnetic core to a center of the gap and a straight line extending from the geographical center to a center of the coil being in a range of 10° to 90°.Type: GrantFiled: December 11, 2009Date of Patent: September 30, 2014Assignee: Hitachi Metals, Ltd.Inventors: Masaki Nakamura, Hirokazu Araki, Masahiro Mita
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Publication number: 20140167546Abstract: The magnetic gear device is equipped with a first magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in a specific direction; a second magnet row which is opposed to the first magnet row and in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in the specific direction at a pitch shorter (or longer) than that of the first magnet row; and a magnetic body row which is disposed between the first magnet row and the second magnet row and in which a plurality of magnetic bodies are arranged at substantially equal intervals in the specific direction, wherein a distance between the plurality of magnetic bodies and the second magnet row in the opposing direction is shorter (or longer) than a distance between the plurality of magnetic bodies and the first magnet row.Type: ApplicationFiled: June 27, 2012Publication date: June 19, 2014Applicant: HITACHI METALS, LTD.Inventors: Junichi Sutani, Hiromitsu Ohhashi, Masahiro Mita
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Publication number: 20130315705Abstract: Provided is a motor device capable of suppressing undesired vibrations occurring at the time of starting a motor, by canceling a torque in a motor device system so as to reduce a reaction torque acting on a motor base. The motor device is equipped with a dual axis motor having first and second rotating shafts and projecting at either end, a rotational direction converter having an input shaft to which the torque of the dual axis motor is inputted and an output shaft that outputs the torque by rotating in a direction opposite to that of the input shaft, and a flywheel provided at an end portion of the first rotating shaft, for balancing out the reaction torque acting on the input shaft and the output shaft of the rotational direction converter when the dual axis motor rotates.Type: ApplicationFiled: February 2, 2012Publication date: November 28, 2013Applicant: HITACHI METALS, LTD.Inventor: Masahiro Mita
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Patent number: 8587295Abstract: An angle detection apparatus comprising a magnet rotor having a multi-pole segment magnet, and a magnetic sensor for detecting the direction of a magnetic flux generated from the multi-pole segment magnet; the multi-pole segment magnet having pluralities of magnetic poles along the rotation direction of the magnet rotor, the magnetic sensor comprising a magnetosensitive plane having pluralities of spin-valve, giant-magnetoresistive devices each having a pinned layer having a fixed magnetization direction and a free layer having a magnetization direction rotating in response to the magnetic flux direction; and the magnetic sensor being positioned relative to the magnet rotor, such that the magnetosensitive plane crosses the magnetic flux, with perpendicular magnetic flux density components having different amplitudes on the magnetosensitive plane.Type: GrantFiled: February 26, 2010Date of Patent: November 19, 2013Assignee: Hitachi Metals, Ltd.Inventors: Kyohei Aimuta, Masahiro Mita
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Publication number: 20130299349Abstract: A racetrack-shaped magnetic-field-generating apparatus for magnetron sputtering comprising a linear portion and corner portions, the linear portion comprising a magnetic base, a center permanent magnet disposed on its surface, and side permanent magnets disposed on both sides thereof with a gap; the center and side permanent magnets being vertically magnetized with opposite polarities; the corner portions comprising a non-magnetic base, a center magnetic pole member disposed on its surface, a semicircular or semi-polygonal, peripheral magnetic pole member, and plural permanent magnets arranged between both magnetic pole members with their magnetization directions in parallel to a target surface; and the magnetic poles of plural permanent magnets opposing the center magnetic pole member having the same polarity as those of the center permanent magnet opposing the target.Type: ApplicationFiled: January 12, 2011Publication date: November 14, 2013Applicant: HITACHI METALS, LTD.Inventors: Yoshihiko Kuriyama, Masahiro Mita
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Patent number: 8564283Abstract: An apparatus for detecting a rotation angle using a magnet rotor comprising a magnet having 2N poles, wherein N is a natural number, and a sensor device for detecting the direction of a magnetic flux from the magnet rotor, at least one of two output voltages obtained in radial and rotational directions by the sensor device being multiplied by a correction coefficient, and the rotation angle being calculated from the two corrected output voltages to increase the detection accuracy of the rotation angle.Type: GrantFiled: February 3, 2009Date of Patent: October 22, 2013Assignee: Hitachi Metals, Ltd.Inventors: Masahiro Mita, Kyohei Aimuta, Osamu Shimoe, Rihito Kagawa
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Publication number: 20130127278Abstract: A magnetic gear device including: an internal rotor and an external rotor in which a plurality of magnetic pole pairs are each placed in a circumferential direction substantially at equal intervals; and a holding member that is placed between the internal rotor and the external rotor and holds a plurality of magnetic materials in the circumferential direction substantially at equal intervals, wherein the number of magnetic materials is a difference between or a total of the numbers of magnetic pole pairs, the holding member includes a plurality of circular rings that hold the magnetic materials, and connecting rods that are placed in the circumferential direction substantially at equal intervals and connect the plurality of circular rings, the plurality of circular rings face each other via the magnetic materials, and each number of magnetic pole pairs is set to have the number of connecting rods as a divisor.Type: ApplicationFiled: June 20, 2011Publication date: May 23, 2013Applicant: HITACHI METALS, LTD.Inventor: Masahiro Mita
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Patent number: 8157929Abstract: Disclosed are: a magnetic shielding material having excellent magnetic shielding property at a low magnetic field; and a magnetic shielding component and a magnetic shielding room each using the magnetic shielding material. Specifically disclosed is a magnetic shielding material comprising the following components (by mass): Ni: 70.0-85.0%, Cu: 0.6% or less, Mo: 10.0% or less and Mn: 2.0% or less, with the remainder being substantially Fe. The magnetic shielding material has a relative magnetic permeability of 40,000 or more under a magnetic field of 0.05 A/m and a squareness ratio (Br/B0.8) of 0.85 or less, wherein the squareness ratio (Br/B0.8) is a ratio of a remanent magnetic flux density (Br) to a maximum magnetic flux density (B0.8) in a DC hysteresis curve produced under the maximum magnetic field of 0.8 A/m.Type: GrantFiled: February 12, 2008Date of Patent: April 17, 2012Assignee: Hitachi Metals, Ltd.Inventors: Shin-ichiro Yokoyama, Yasuyuki Ilda, Hakaru Sasaki, Yoji Ishikura, Hiromitsu Itabashi, Masahiro Mita, Yoshiyuki Fujihara
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Publication number: 20120086619Abstract: A resonance-type, receiving antenna comprising a circular-ring-shaped, magnetic core constituting a closed magnetic path having one gap, one or more coils wound around the circular-ring-shaped, magnetic core, and a capacitor connected in parallel to both ends of each coil; an angle between a straight line extending from a geographical center of the circular-ring-shaped, magnetic core to a center of the gap and a straight line extending from the geographical center to a center of the coil being in a range of 10° to 90°.Type: ApplicationFiled: December 11, 2009Publication date: April 12, 2012Applicant: HITACHI METALS, LTD.Inventors: Masaki Nakamura, Hirokazu Araki, Masahiro Mita
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Publication number: 20120038348Abstract: An angle detection apparatus comprising a magnet rotor having a multi-pole segment magnet, and a magnetic sensor for detecting the direction of a magnetic flux generated from the multi-pole segment magnet; the multi-pole segment magnet having pluralities of magnetic poles along the rotation direction of the magnet rotor, the magnetic sensor comprising a magnetosensitive plane having pluralities of spin-valve, giant-magnetoresistive devices each having a pinned layer having a fixed magnetization direction and a free layer having a magnetization direction rotating in response to the magnetic flux direction; and the magnetic sensor being positioned relative to the magnet rotor, such that the magnetosensitive plane crosses the magnetic flux, with perpendicular magnetic flux density components having different amplitudes on the magnetosensitive plane.Type: ApplicationFiled: February 26, 2010Publication date: February 16, 2012Applicant: HITACHI METALS, LTD.Inventors: Kyohei Aimuta, Masahiro Mita