Patents by Inventor Tatsuya Kitamura

Tatsuya Kitamura 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: 20190131883
    Abstract: A power conversion device that supplies power to a load using a module incorporating a semiconductor element is such that a sealing wall that holds a sealing resin is provided on a metal case that cools the module, a feedback current channel, which is one wiring member forming a current channel that passes into and out of the semiconductor element, is the metal case, and another wiring member is disposed in proximity to and parallel with the sealing wall of the metal case.
    Type: Application
    Filed: February 17, 2017
    Publication date: May 2, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya KITAMURA, Kohei ONDA
  • Patent number: 10038224
    Abstract: A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: July 31, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yohei Tan, Tatsuya Kitamura, Takahiko Yamamuro
  • Publication number: 20180045513
    Abstract: A range sensor includes a light source, a light receiver, a controller, and a range information generator. The light source repeatedly emits illumination light onto a target. The light receiver receives light from the start of a time period during which the illumination light is emitted. The controller controls the light source and the light receiver so that each of the amounts of light received by the light receiver is cumulated in synchronization with emission of the illumination light. The range information generator generates range information indicating the range to the target based on the cumulative amounts of received light. The controller changes the cumulative number that is the number of cumulating operations in which the light receiver cumulates each of the amounts of received light, in accordance with the magnitudes of the cumulative amounts of received light.
    Type: Application
    Filed: October 16, 2017
    Publication date: February 15, 2018
    Inventors: Tatsuya KITAMURA, Hironari YAMAMOTO
  • Publication number: 20170373353
    Abstract: A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.
    Type: Application
    Filed: January 21, 2016
    Publication date: December 28, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yohei TAN, Tatsuya KITAMURA, Takahiko YAMAMURO
  • Patent number: 9539909
    Abstract: Phase coils are each configured by winding a conductor wire in a concentrated winding consecutively on three circumferentially consecutive tooth portions, six inverter units of an inverter module are each disposed in close proximity to a motor so as to face each of the phase coils axially, and the motor and the inverter module are electrically connected by connecting an alternating-current output terminals of each of the plurality of inverter units to output wires of the phase coils that face the inverter units axially.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: January 10, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Moriyuki Hazeyama, Yoshihiro Miyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
  • Patent number: 8866353
    Abstract: A first inverter ventilation aperture is disposed so as to pass through a portion of a fin base that faces a bearing, a first rotor ventilation aperture is disposed so as to pass through a portion of a bottom surface portion that faces the bearing, and a first cooling airflow ventilation channel is formed in which a cooling airflow flows radially inward through radiating fins, then flows toward a first surface side of a mount portion through the first inverter ventilation aperture, flows axially through an interior portion of a stator core, and then flows out between the bottom surface portion and a base portion through the first rotor ventilation aperture, and subsequently flows radially outward between the bottom surface portion and the base portion due to rotational driving of a centrifugal fan.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: October 21, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihiro Miyama, Moriyuki Hazeyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
  • Patent number: 8598920
    Abstract: A gate driving circuit for driving a voltage-driven switching device is provided with a current limiting circuit for limiting a gate current ig that flows into a gate terminal through a gate resistor at turn-on to a current limit value IL which defines an upper limit value. The current limit value IL is set at a value which is larger than a gate current value I2 at turn-on of the switching device during a period when the Miller effect occurs but is smaller than a gate current value I1 at a point in time when a main current begins to flow at turn-on in a case where the gate current ig is not limited by the current limiting circuit. This arrangement makes a variation in a collector current of the switching device moderate at turn-on thereof when the collector current begins to flow, thereby reducing high-frequency noise.
    Type: Grant
    Filed: May 7, 2010
    Date of Patent: December 3, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroshi Nakatake, Shinichi Kinouchi, Tatsuya Kitamura
  • Patent number: 8519751
    Abstract: A gate drive circuit capable of turning on a semiconductor switching element at high speed, which includes: a buffer circuit including a turn-on-drive switching element and a turn-off-drive switching element that are complementarily turned on and off, for driving the semiconductor switching element; a first DC voltage supply including a positive electrode connected to the source or emitter of the turn-on-drive switching element and a negative electrode connected to a reference potential; and a second DC voltage supply including a positive electrode connected to the source or emitter of the turn-off-drive switching element and a negative electrode connected to the reference potential.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: August 27, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Kitamura, Hiroshi Nakatake, Yasushi Nakayama
  • Publication number: 20120319542
    Abstract: Phase coils are each configured by winding a conductor wire in a concentrated winding consecutively on three circumferentially consecutive tooth portions, six inverter units of an inverter module are each disposed in close proximity to a motor so as to face each of the phase coils axially, and the motor and the inverter module are electrically connected by connecting an alternating-current output terminals of each of the plurality of inverter units to output wires of the phase coils that face the inverter units axially.
    Type: Application
    Filed: January 20, 2011
    Publication date: December 20, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Moriyuki Hazeyama, Yoshihiro Miyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
  • Publication number: 20120299407
    Abstract: A first inverter ventilation aperture is disposed so as to pass through a portion of a fin base that faces a bearing, a first rotor ventilation aperture is disposed so as to pass through a portion of a bottom surface portion that faces the bearing, and a first cooling airflow ventilation channel is formed in which a cooling airflow flows radially inward through radiating fins, then flows toward a first surface side of a mount portion through the first inverter ventilation aperture, flows axially through an interior portion of a stator core, and then flows out between the bottom surface portion and a base portion through the first rotor ventilation aperture, and subsequently flows radially outward between the bottom surface portion and the base portion due to rotational driving of a centrifugal fan.
    Type: Application
    Filed: January 20, 2011
    Publication date: November 29, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshihiro Miyama, Moriyuki Hazeyama, Masaya Inoue, Yoshiko Obiraki, Tatsuya Kitamura
  • Publication number: 20120153998
    Abstract: A gate drive circuit capable of turning on a semiconductor switching element at high speed, which includes: a buffer circuit including a turn-on-drive switching element and a turn-off-drive switching element that are complementarily turned on and off, for driving the semiconductor switching element; a first DC voltage supply including a positive electrode connected to the source or emitter of the turn-on-drive switching element and a negative electrode connected to a reference potential; and a second DC voltage supply including a positive electrode connected to the source or emitter of the turn-off-drive switching element and a negative electrode connected to the reference potential.
    Type: Application
    Filed: September 2, 2010
    Publication date: June 21, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tatsuya Kitamura, Hiroshi Nakatake, Yasushi Nakayama
  • Publication number: 20120013371
    Abstract: A gate driving circuit for driving a voltage-driven switching device is provided with a current limiting circuit for limiting a gate current ig that flows into a gate terminal through a gate resistor at turn-on to a current limit value IL which defines an upper limit value. The current limit value IL is set at a value which is larger than a gate current value I2 at turn-on of the switching device during a period when the Miller effect occurs but is smaller than a gate current value I1 at a point in time when a main current begins to flow at turn-on in a case where the gate current ig is not limited by the current limiting circuit. This arrangement makes a variation in a collector current of the switching device moderate at turn-on thereof when the collector current begins to flow, thereby reducing high-frequency noise.
    Type: Application
    Filed: May 7, 2010
    Publication date: January 19, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hiroshi Nakatake, Shinichi Kinouchi, Tatsuya Kitamura
  • Patent number: 7617102
    Abstract: A speaker identifying apparatus includes: a module for performing a principal component analysis on predetermined vocal tract geometrical parameters of a plurality of speakers and calculating an average and principal component vectors representing speaker-dependent variation; a module for performing acoustic analysis on the speech data being uttered for each of the speakers to calculate cepstrum coefficients; a module for calculating principal component coefficients for approximating the vocal tract geometrical parameter of each of the plurality of speakers by a linear sum of principal component coefficients; a module for determining, by multiple regression analysis, a coefficient sequence for estimating principal component coefficients by a linear sum of the plurality of prescribed features, for each of the plurality of speakers; a module for calculating a plurality of features from speech data of the speaker to be identified, and estimating principal component coefficients for calculating the vocal tract ge
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: November 10, 2009
    Assignee: Advanced Telecommunications Research Institute International
    Inventors: Parham Mokhtari, Tatsuya Kitamura, Hironori Takemoto, Seiji Adachi, Kiyoshi Honda
  • Publication number: 20070106511
    Abstract: A speaker identifying apparatus includes: a module for performing a principal component analysis on predetermined vocal tract geometrical parameters of a plurality of speakers and calculating an average and principal component vectors representing speaker-dependent variation; a module for performing acoustic analysis on the speech data being uttered for each of the speakers to calculate cepstrum coefficients; a module for calculating principal component coefficients for approximating the vocal tract geometrical parameter of each of the plurality of speakers by a linear sum of principal component coefficients; a module for determining, by multiple regression analysis, a coefficient sequence for estimating principal component coefficients by a linear sum of the plurality of prescribed features, for each of the plurality of speakers; a module for calculating a plurality of features from speech data of the speaker to be identified, and estimating principal component coefficients for calculating the vocal tract ge
    Type: Application
    Filed: September 27, 2006
    Publication date: May 10, 2007
    Inventors: Parham Mokhtari, Tatsuya Kitamura, Hironori Takemoto, Seiji Adachi, Kiyoshi Honda
  • Patent number: 6599467
    Abstract: The invention provides a process for forging a titanium-based material comprises the steps of: preparing a titanium-based sintered workpiece including at least one of ceramics particles and pores in a total amount of 1% or more by volume, the ceramics particles being thermodynamically stable in a titanium alloy; and heating the workpiece to a forging temperature and forging the same. In the production process, the pores or the ceramics particles inhibit the grain growth during forging. Accordingly, it is possible to carry out the forging at a relatively high temperature at which the titanium-based material exhibits a small resistance to deformation. Moreover, the titanium-based material can maintain an appropriate microstructure even after the forging. Consequently, the impact value and the fatigue strength are inhibited from decreasing.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: July 29, 2003
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisan Kogyo Kabushiki Kaisha
    Inventors: Toshiya Yamaguchi, Akio Hotta, Yoshinori Shibata, Tadahiko Furuta, Takashi Saito, Satoru Iwase, Takashi Haruta, Tatsuya Kitamura
  • Publication number: 20030041071
    Abstract: The present invention provides a database for implementing in a straightforward manner the sharing of a variety of touchpoint information between departments in an enterprise or the sharing of a variety of touchpoint information between enterprises.
    Type: Application
    Filed: August 21, 2002
    Publication date: February 27, 2003
    Applicant: KOMATSU LTD.
    Inventors: Hideyuki Wakai, Takashi Kurihara, Hirobumi Miwa, Tatsuya Kitamura, Akihiro Takiguchi, Junbo Song
  • Patent number: 5774629
    Abstract: An apparatus for correctly inferring the causes of a failure of driving machine or the like. Each time a true cause is found, the data on the degree of relevance of the cause is so corrected that the degree of the other causes becomes high and those of the other causes become low. On the basis of the data on the failure rate and the data on the degree of the relevance, the certainty of each cause is inferred by a first inferring means. The data on the predicted failure rate of each cause and the data on the actual failure rate are compared, and the certainty of each cause is inferred by a second inferring means in such a way that the certainty of a cause having less errors becomes higher. The certainties inferred by the first and second inferring means are weighted in a predetermined way. Based upon these weighted certainties, final certainties are inferred.
    Type: Grant
    Filed: December 20, 1995
    Date of Patent: June 30, 1998
    Assignee: Komatsu Ltd.
    Inventors: Hiroyoshi Yamaguchi, Tatsuya Kitamura, Kunitoshi Suzuki
  • Patent number: 5621158
    Abstract: A measurement value judgment method for comparing measurement values from sensors provided at various locations of a system with pre-set reference values, and judging, based on the results of the comparison so made, whether the system is normal or abnormal, comprises the steps of judging a quantity of state relative to the load on the system and changing the reference values in response to the results of the judgement, the thereby judging accurately whether or not the system and sensors are in an abnormal status by accurately identifying the operating state of the system.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: April 15, 1997
    Assignee: Komatsu Ltd.
    Inventors: Tatsuya Kitamura, Tatsuya Ariga