Patents by Inventor Tetsuya Kojima

Tetsuya Kojima 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).

  • Publication number: 20190300379
    Abstract: An object of the present invention is to provide ferrite particles having a high magnetic permeability in a frequency band of 1 MHz to 1 GHz. Another object is to provide a resin composition containing the ferrite particles and an electromagnetic wave shielding material composed of the resin composition. The ferrite particles are composed of a single crystalline body having an average particle size of 1 to 2000 nm and has a spherical particle shape, wherein the ferrite particles contain substantially no Zn, 3 to 25 wt % of Mn, and 43 to 65 wt % of Fe, and a real part ?? of a complex magnetic permeability measured using a molding composed of the ferrite particles and a binder resin has a maximal value in a frequency band of 100 MHz to 1 GHz.
    Type: Application
    Filed: May 31, 2017
    Publication date: October 3, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Publication number: 20190252815
    Abstract: A connector includes terminals (14) connected to terminal ends of electrical wires (12); a housing (20) including a terminal housing chamber (21) in which the terminals (14) are housed and an electrical wire lead-out portion (24) from which the electrical wires (12) are led out. A first cover (50A) covers the electrical wires (12) led out from the electrical wire lead-out portion (24), and a second cover (50B) causes the electrical wires (12) to be inserted between the second cover 50B itself and the first cover (50A) in a state of being assembled to the first cover (50A). At least one of the first and second covers (50A, 50B) includes electrical wire pressing portions (56A, 56B) that press the electrical wires (12) led out from the electrical wire lead-out portion (24) when the first and second covers (50A, 50B) are assembled together.
    Type: Application
    Filed: February 11, 2019
    Publication date: August 15, 2019
    Inventors: Teruo Hara, Hajime Kawase, Masaaki Tabata, Tetsuya Miyamura, Yasuo Omori, Shunya Takeuchi, Hiroki Kobayashi, Hisashi Kojima, Takeshi Misaiji, Hiroshi Kobayashi
  • Patent number: 10354867
    Abstract: A method for manufacturing an epitaxial wafer comprising a silicon carbide substrate and a silicon carbide voltage-blocking-layer, the method includes: epitaxially growing a buffer layer on the substrate, doping a main dopant for determining a conductivity type of the buffer layer and doping an auxiliary dopant for capturing minority carriers in the buffer layer at a doping concentration less than the doping concentration of the main dopant, so that the buffer layer enhances capturing and extinction of the minority carriers, the minority carriers flowing in a direction from the voltage-blocking-layer to the substrate, so that the buffer layer has a lower resistivity than the voltage-blocking-layer, and so that the buffer layer includes silicon carbide as a main component; and epitaxially growing the voltage-blocking-layer on the buffer layer.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: July 16, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Hidekazu Tsuchida, Tetsuya Miyazawa, Yoshiyuki Yonezawa, Tomohisa Kato, Kazutoshi Kojima, Takeshi Tawara, Akihiro Otsuki
  • Publication number: 20190161362
    Abstract: An object of the present invention is to provide ferrite particles having a high saturation magnetisation, and being excellent in the dispersibility in a resin, a solvent or a resin composition, a resin composition including the ferrite particles, and a resin film composed of the resin composition. The ferrite particles are a single crystalline body having an average particle size of 1 to 2000 nm, and Mn-based ferrite particles having a spherical shape, and have a saturation magnetisation of 45 to 95 Am2/kg. The resin composition includes the ferrite particles as a filler. The resin film is composed of the resin composition.
    Type: Application
    Filed: February 22, 2017
    Publication date: May 30, 2019
    Applicant: POWDERTECH CO., LTD.
    Inventors: Takashi KOJIMA, Kazutaka ISHII, Takao SUGIURA, Tetsuya IGARASHI, Koji AGA
  • Publication number: 20190148592
    Abstract: To provide a Group III nitride semiconductor light-emitting device exhibiting the improved light extraction efficiency as well as reducing the influence of polarization that a p-type conductivity portion and an n-type conductivity portion occur in the AlGaN layer caused by the Al composition variation, and a production method therefor. A first p-type contact layer is a p-type AlGaN layer. A second p-type contact layer is a p-type AlGaN layer. The Al composition in the first p-type contact layer is reduced with distance from a light-emitting layer. The Al composition in the second p-type contact layer is reduced with distance from the light-emitting layer. The Al composition in the second p-type contact layer is lower than that in the first p-type contact layer. The Al composition variation rate to the unit thickness in the second p-type contact layer is higher than that in the first p-type contact layer.
    Type: Application
    Filed: November 8, 2018
    Publication date: May 16, 2019
    Inventors: Tetsuya TAKEUCHI, Satoshi KAMIYAMA, Motoaki IWAYA, Isamu AKASAKI, Hisanori KOJIMA, Toshiki YASUDA, Kazuyoshi IIDA
  • Publication number: 20190119817
    Abstract: A coating is formed by coating a treatment solution containing a 20-400 ppm total, calculated as titanium and calculated as zirconium, of a titanium fluoride compound and/or a zirconium fluoride compound on the surface of an aluminum material so that the total of titanium and zirconium is 4-25 mg/m2, and drying.
    Type: Application
    Filed: March 22, 2017
    Publication date: April 25, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Tetsuya KOJIMA, Yosuke OTA
  • Publication number: 20190113786
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least pan of the alignment film contacts the organic insulating film.
    Type: Application
    Filed: December 12, 2018
    Publication date: April 18, 2019
    Applicant: Japan Display Inc.
    Inventors: Tetsuya KOJIMA, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 10197858
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least part of the alignment film contacts the organic insulating film.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: February 5, 2019
    Assignee: Japan Display Inc.
    Inventors: Tetsuya Kojima, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Publication number: 20180217423
    Abstract: According to one embodiment, the organic insulating film and the alignment film are provided on the first substrate. The alignment film is located between the liquid crystal layer and the organic insulating film and contacts the liquid crystal layer. The organic insulating film has a restricting portion on an inner side from the sealant and on an outer side from the display area. The restricting portion includes a recess and a projection extending in predetermined directions. The alignment film is formed on the restricting portion.
    Type: Application
    Filed: January 30, 2018
    Publication date: August 2, 2018
    Applicant: Japan Display Inc.
    Inventors: Daiichi SUZUKI, Hirofumi WAKEMOTO, Mitsutaka OKITA, Tetsuya KOJIMA
  • Publication number: 20180217422
    Abstract: According to one embodiment, a display device includes a first substrate, a second substrate, a sealant, a liquid crystal layer, an organic insulating film, an alignment film and an inorganic insulating film. The second substrate is opposed to the first substrate. The sealant attaches the first substrate and the second substrate to each other. The liquid crystal layer is arranged between the first substrate and the second substrate. The organic insulating film, the alignment film and the inorganic insulating film are provided on the first substrate. The alignment film contacts the liquid crystal layer. The inorganic insulating film is located between the alignment film and the organic insulating film. At least part of the alignment film contacts the organic insulating film.
    Type: Application
    Filed: January 22, 2018
    Publication date: August 2, 2018
    Applicant: Japan Display Inc.
    Inventors: Tetsuya Kojima, Hirofumi Wakemoto, Mitsutaka Okita, Daiichi Suzuki
  • Patent number: 9720767
    Abstract: A storage apparatus includes a channel control unit, a storage device, and a processor. The channel control unit includes a plurality of operation units. The processor specifies, when receiving a request for read of a plurality of pieces of element data from a host computer, the plurality of pieces of element data to the plurality of operation units, respectively. The plurality of operation units respectively reads the plurality of pieces of element data from the storage device, calculates a plurality of partial codes that is a plurality of guarantee codes on the basis of the plurality of pieces of element data, and transmits the plurality of partial codes to the processor. The processor calculates, on the basis of the plurality of partial codes, a sequence code that is a guarantee code of sequence data including the plurality of pieces of element data which is concatenated.
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: August 1, 2017
    Assignee: HITACHI, LTD.
    Inventors: Shinichi Kasahara, Masahiro Ide, Tetsuya Kojima
  • Patent number: 9391705
    Abstract: A non-contact connector is the solving means that a plurality of new light sources discretely distributed over a circumferential direction are generated from one light source on a rotator, and the lining is performed as the new light source with the characteristic which are not in an original light source. At the time of rotation of the light source, at least one in two or more new light sources maintain connection with an external output terminal and switch the remaining new light sources, so an always-on connection state is secured and the hit of the time-axis of the line signal at the time of an optical path change is avoided.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: July 12, 2016
    Assignee: CHUBU NIHON MARUKO CO., LTD.
    Inventors: Tetsuya Kojima, Hiroyuki Koitabashi
  • Patent number: 9331623
    Abstract: The present invention provides a brushless motor in which the voltage utilization ratio can be increased and the torque and output of the motor can thereby be increased, and also provides a drive method for a brushless motor. The brushless motor includes an armature constituted by an armature core having armature windings of a plurality of phases, and a field pole constituted by a field pole core having a plurality of permanent magnets. A voltage, in which at least a 5th order harmonic component is superimposed on a 1st order fundamental wave of a voltage under predetermined phase difference condition and amplitude condition in order to increase a 1st order fundamental wave peak of the applied voltage over an applied voltage peak, is applied to the armature windings.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: May 3, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yu Hirotani, Ryuichi Takiguchi, Yuji Takizawa, Tetsuya Kojima, Masatsugu Nakano, Satoru Akutsu
  • Patent number: 9231510
    Abstract: A control device for rotary machine includes: a voltage instruction generation section for generating a voltage instruction; a voltage application section for applying voltage to a rotary machine based on the voltage instruction; a current detection section for detecting rotary machine current of the rotary machine; and an inductance calculation section for calculating an inductance of the rotary machine from the voltage instruction and the rotary machine current. The voltage instruction generation section generates voltage instructions of constant DC voltages. The voltage application section applies voltages to the rotary machine based on the voltage instructions. The inductance calculation section calculates the inductance from a voltage instruction for measurement arbitrarily selected from the voltage instructions, and the rotary machine currents detected by the current detection section before and after application of the voltage instruction for measurement.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: January 5, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yosuke Hachiya, Tetsuya Kojima, Shoji Adachi
  • Publication number: 20150339184
    Abstract: A storage apparatus includes a channel control unit, a storage device, and a processor. The channel control unit includes a plurality of operation units. The processor specifies, when receiving a request for read of a plurality of pieces of element data from a host computer, the plurality of pieces of element data to the plurality of operation units, respectively. The plurality of operation units respectively reads the plurality of pieces of element data from the storage device, calculates a plurality of partial codes that is a plurality of guarantee codes on the basis of the plurality of pieces of element data, and transmits the plurality of partial codes to the processor. The processor calculates, on the basis of the plurality of partial codes, a sequence code that is a guarantee code of sequence data including the plurality of pieces of element data which is concatenated.
    Type: Application
    Filed: January 24, 2013
    Publication date: November 26, 2015
    Applicant: HITACHI, LTD.
    Inventors: Shinichi KASAHARA, Masahiro IDE, Tetsuya KOJIMA
  • Patent number: 9130481
    Abstract: In a power converting apparatus having a plurality of phases on an AC side and configured to perform conversion between DC power and AC power, a current detector detects currents flowing through a DC source line through which a plurality of phase currents commonly flow. A control unit sets a current detection period and a succeeding current control period in each successive control cycle. Using first gate signals based on reference gate signals for PWM control, the control unit calculates values of the individual phase currents from the first gate signals and the detected currents during the current detection period. Then, during the current control period, the control unit performs PWM control using phase voltage commands generated by correcting phase voltage target values so as to cancel out voltage errors that occur during the current detection period.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: September 8, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kosuke Nakano, Tetsuya Kojima
  • Publication number: 20150222362
    Abstract: A non-contact connector is the solving means that a plurality of new light sources discretely distributed over a circumferential direction are generated from one light source on a rotator, and the lining is performed as the new light source with the characteristic which are not in an original light source. At the time of rotation of the light source, at least one in two or more new light sources maintain connection with an external output terminal and switch the remaining new light sources, so an always-on connection state is secured and the hit of the time-axis of the line signal at the time of an optical path change is avoided.
    Type: Application
    Filed: February 27, 2013
    Publication date: August 6, 2015
    Inventors: Tetsuya Kojima, Hiroyuki Koitabashi
  • Publication number: 20150192811
    Abstract: A display device includes a first substrate, a second substrate, liquid crystal interposed between the first substrate and the second substrate, a sealing material formed in a closed pattern surrounding the liquid crystal in order to attach together the first substrate and the second substrate, and a barrier arranged along the pattern of the sealing material outside the sealing material to fill a gap between the first substrate and the second substrate.
    Type: Application
    Filed: December 30, 2014
    Publication date: July 9, 2015
    Inventors: Tetsuya KOJIMA, Toshiyuki HIGANO
  • Patent number: 8963462
    Abstract: Provided are rotational position detection means detecting the rotational position of a multiplex-winding rotary machine; failure determination means determining failure of the rotational position detection means; control means calculating a voltage instruction for each winding group, based on the rotational position detected by the rotational position detection means; and voltage application means applying voltage to each winding group, based on the voltage instruction. According to the failure determination by the failure determination means, the control means outputs a voltage instruction for rotational position estimation to the voltage application means, and estimates the rotational position ?e, based on at least one of voltage and current obtained from the winding group in accordance with the voltage instruction.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: February 24, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Tetsuya Kojima
  • Publication number: 20140340015
    Abstract: The present invention provides a brushless motor in which the voltage utilization ratio can be increased and the torque and output of the motor can thereby be increased, and also provides a drive method for a brushless motor. The brushless motor includes an armature constituted by an armature core having armature windings of a plurality of phases, and a field pole constituted by a field pole core having a plurality of permanent magnets. A voltage, in which at least a 5th order harmonic component is superimposed on a 1st order fundamental wave of a voltage under predetermined phase difference condition and amplitude condition in order to increase a 1st order fundamental wave peak of the applied voltage over an applied voltage peak, is applied to the armature windings.
    Type: Application
    Filed: January 11, 2013
    Publication date: November 20, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yu Hirotani, Ryuichi Takiguchi, Yuji Takizawa, Tetsuya Kojima, Masatsugu Nakano, Satoru Akutsu