Patents by Inventor Takeshi Uematsu

Takeshi Uematsu 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: 20220278554
    Abstract: A control circuit controls a power supply circuit to generate transmitting power having a frequency varying within a frequency range. The control circuit determines a stably transmitting frequency based on a detected output voltage of a power receiver apparatus, the stably transmitting frequency indicating a frequency of the transmitting power at which dependency of the output voltage on a load value of the power receiver apparatus is at least locally minimized within the frequency range. The control circuit determines a transmitting voltage based on the detected output voltage, the transmitting voltage indicating a voltage of the transmitting power at which the output voltage reaches a target voltage when generating transmitting power having the stably transmitting frequency. The control circuit controls the power supply circuit to generate transmitting power having the stably transmitting frequency and the transmitting voltage.
    Type: Application
    Filed: August 5, 2019
    Publication date: September 1, 2022
    Inventors: Taichi MISHIMA, Yuki ITO, Shingo NAGAOKA, Takeshi UEMATSU
  • Patent number: 11329513
    Abstract: A contactless power transmission apparatus includes a transmitter that includes a transmitter coil that supplies electric power to a receiver and a power supply circuit that supplies alternating current power to the transmitter coil. The receiver includes a resonant circuit including a receiver coil that receives electric power from the transmitter and a resonant capacitor connected in series to the receiver coil, a rectifier circuit that rectifies electric power output from the resonant circuit, and a coil connected in parallel to the resonant circuit between the resonant circuit and the rectifier circuit.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: May 10, 2022
    Assignee: OMRON Corporation
    Inventors: Goro Nakao, Yusuke Kawai, Atsushi Nomura, Toshiyuki Zaitsu, Takeshi Uematsu
  • Patent number: 11309741
    Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: April 19, 2022
    Assignees: OMRON CORPORATION, NATIONAL UNIVERSITY CORPORATION CHIBA UNIVERSITY
    Inventors: Taichi Mishima, Shingo Nagaoka, Takeshi Uematsu, Hiroo Sekiya
  • Publication number: 20220052554
    Abstract: A detection circuit detects at least one of a value of a current flowing through a power transmitting coil, and a value of a current or voltage generated by an auxiliary coil. A control circuit determines a transmitting frequency based on the value detected by the detection circuit, the transmitting frequency at least locally minimizing load dependence. The control circuit determines a voltage for the transmitting power at which an output voltage of a power receiver apparatus is equal to a predetermined target voltage when generating the transmitting power having the transmitting frequency determined, and controls the power supply circuit to generate the transmitting power having the transmitting frequency and voltage determined.
    Type: Application
    Filed: November 28, 2019
    Publication date: February 17, 2022
    Inventors: Shingo NAGAOKA, Taichi MISHIMA, Takeshi UEMATSU
  • Publication number: 20220052555
    Abstract: A first detector detects a value of a current or voltage generated by an auxiliary coil. A second detector detects a value of a current flowing through a power transmitting coil. A coupling coefficient estimator estimates a first coupling coefficient between the power transmitting coil and a power receiving coil, based on the value of the current or voltage generated by the auxiliary coil, and estimates a second coupling coefficient between the power transmitting coil and the power receiving coil, based on the value of the current flowing through the power transmitting coil. A control circuit controls a power supply circuit to stop power transmission to a power receiver apparatus when a difference between the coupling coefficients is greater than a threshold.
    Type: Application
    Filed: November 28, 2019
    Publication date: February 17, 2022
    Inventors: Shingo NAGAOKA, Taichi MISHIMA, Takeshi UEMATSU
  • Publication number: 20210351709
    Abstract: A resonant converter controller is provided. Each period in drive control has a drive time interval and a pause time interval for driving/pausing the resonant converter. The resonant converter controller circuit includes a first oscillating means for generating a clock signal, a second oscillating means for generating a sawtooth wave signal, a third oscillating means for generating a rectangular wave signal, comparison means for outputting a comparison signal indicating the drive time interval, by comparing the sawtooth wave signal with a threshold signal, which is generated based on a difference voltage between an output voltage of the resonant converter and a target voltage, and which indicates a ratio of the drive time interval to the pause time interval, and a logical operation means for generating a drive control signal based on the comparison signal and the rectangular wave signal to drive and control the resonant converter.
    Type: Application
    Filed: January 30, 2020
    Publication date: November 11, 2021
    Inventor: Takeshi UEMATSU
  • Patent number: 11162914
    Abstract: Provided are a pressure-resistance inspection apparatus for valves and its inspection method, and hydrogen gas detection unit capable of detecting external leakage and specifying its position of occurrence even for valves with different sizes and shapes by performing pressure-resistance inspection with a simple structure quickly with high accuracy while preventing errors in test results, without requiring post-treatment for the valves, and also capable of mass processing by automation. Provided are a cover 2 in which a test valve 1 is accommodated in a state of being isolated from outside and a sensor 22 inside this cover 2 and capable of moving to a position close to an outer surface of the test valve 1 filled with a search gas. This sensor 22 is a gas sensor capable of detecting external leakage of the search gas from the test valve 1.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: November 2, 2021
    Assignee: KITZ CORPORATION
    Inventors: Takeshi Uematsu, Naoki Kira
  • Publication number: 20210203187
    Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.
    Type: Application
    Filed: November 30, 2020
    Publication date: July 1, 2021
    Inventors: Taichi MISHIMA, Shingo NAGAOKA, Takeshi UEMATSU, Hiroo SEKIYA
  • Publication number: 20210044151
    Abstract: A contactless power transmission apparatus includes a transmitter that includes a transmitter coil that supplies electric power to a receiver and a power supply circuit that supplies alternating current power to the transmitter coil. The receiver includes a resonant circuit including a receiver coil that receives electric power from the transmitter and a resonant capacitor connected in series to the receiver coil, a rectifier circuit that rectifies electric power output from the resonant circuit, and a coil connected in parallel to the resonant circuit between the resonant circuit and the rectifier circuit.
    Type: Application
    Filed: February 1, 2019
    Publication date: February 11, 2021
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Yusuke KAWAI, Atsushi NOMURA, Toshiyuki ZAITSU, Takeshi UEMATSU
  • Publication number: 20190302045
    Abstract: Provided are a pressure-resistance inspection apparatus for valves and its inspection method, and hydrogen gas detection unit capable of detecting external leakage and specifying its position of occurrence even for valves with different sizes and shapes by performing pressure-resistance inspection with a simple structure quickly with high accuracy while preventing errors in test results, without requiring post-treatment for the valves, and also capable of mass processing by automation. Provided are a cover 2 in which a test valve 1 is accommodated in a state of being isolated from outside and a sensor 22 inside this cover 2 and capable of moving to a position close to an outer surface of the test valve 1 filled with a search gas. This sensor 22 is a gas sensor capable of detecting external leakage of the search gas from the test valve 1.
    Type: Application
    Filed: June 30, 2017
    Publication date: October 3, 2019
    Applicant: KITZ CORPORATION
    Inventors: Takeshi UEMATSU, Naoki KIRA
  • Patent number: 10025184
    Abstract: A liquid photocurable resin composition contains a (meth)acrylate oligomer component, an alkyl (meth)acrylate monomer component, and a photopolymerization initiator component. The (meth)acrylate oligomer component contains at least one oligomer selected from the group consisting of a polyurethane (meth)acrylate oligomer, a polyisoprene (meth)acrylate oligomer, a polybutadiene (meth)acrylate oligomer, and a polyether (meth)acrylate oligomer that have a weight average molecular weight of 1,000 to 200,000. The photopolymerization initiator contains a molecule cleavage-type photoradical polymerization initiator and a hydrogen-abstracting photoradical polymerization initiator at a ratio by mass of 10:1 to 10:35. The cured resin that is obtained by photoradical polymerization of the photocurable resin composition has a glass transition temperature of ?40 to 20° C. when the composition is cured at a curing ratio of the outermost surface of more than 90%.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: July 17, 2018
    Assignee: DEXERIALS CORPORATION
    Inventors: Mizuki Iwata, Takeshi Uematsu, Kazuhito Kawabata, Naoki Hayashi
  • Publication number: 20160091791
    Abstract: A liquid photocurable resin composition contains a (meth)acrylate oligomer component, an alkyl (meth)acrylate monomer component, and a photopolymerization initiator component. The (meth)acrylate oligomer component contains at least one oligomer selected from the group consisting of a polyurethane (meth)acrylate oligomer, a polyisoprene (meth)acrylate oligomer, a polybutadiene (meth)acrylate oligomer, and a polyether (meth)acrylate oligomer that have a weight average molecular weight of 1,000 to 200,000. The photopolymerization initiator contains a molecule cleavage-type photoradical polymerization initiator and a hydrogen-abstracting photoradical polymerization initiator at a ratio by mass of 10:1 to 10:35. The cured resin that is obtained by photoradical polymerization of the photocurable resin composition has a glass transition temperature of ?40 to 20° C. when the composition is cured at a curing ratio of the outermost surface of more than 90%.
    Type: Application
    Filed: May 21, 2014
    Publication date: March 31, 2016
    Inventors: Mizuki IWATA, Takeshi UEMATSU, Kazuhito KAWABATA, Naoki HAYASHI
  • Patent number: 7405952
    Abstract: A power supply device has first and second terminals, a transformer, a switching element and an auxiliary power supply element. The first and second terminals receive input power having an input voltage. The transformer has a primary winding and a secondary winding. The primary winding has a pair of winding terminals. One of the pair of winding terminals is connected to the first terminal. The switching element is connected between the second terminal and the other of the pair of winding terminals of the primary winding. The auxiliary power supply element feeds electric power to the transformer when the input voltage decreases to or less than a predetermined value. The auxiliary power supply element has a capacitor and a second switching element for storing energy from the primary winding into the first capacitor during a normal operation of the power supply device.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: July 29, 2008
    Assignee: TDK Corporation
    Inventor: Takeshi Uematsu
  • Patent number: 7362601
    Abstract: A power supply device includes two input ports, two output ports, a transformer having primary and secondary windings, a switch device, and a controller. The switch device includes a switching element connected in series with the primary winding, and a capacitor. The controller switches the switching element to energize the transformer and charge the capacitor. When an AC power failure such as instantaneous interruption occurs, energy stored in the capacitor is discharged to flow through the primary winding. Accordingly, the transformer is energized to maintain generating an output power from the power supply device for a certain time period. The capacitor is provided on a primary side of the transformer, generally higher voltage side, in the power supply device, so that a smaller capacitance of the capacitor can be used.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: April 22, 2008
    Assignee: TDK Corporation
    Inventor: Takeshi Uematsu
  • Patent number: 7330359
    Abstract: The present invention is directed to a power supply unit that provides large power supply to the load. The voltage detector 51 generates a voltage detection signal by detecting the voltage generated at the output terminals 21, 22. The current detector 52 generates a current detection signal by detecting the current that runs through the transformer 3. The control circuit 9 uses the voltage detection signal and the current detection signal and thereby controls, in at least one of the first and second switching elements SW1, SW2, the timing with which the switching element is turned ON and the length of time that the switching element remains ON, such that the transformer current flows in a continuous mode.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: February 12, 2008
    Assignee: TDK Corporation
    Inventor: Takeshi Uematsu
  • Patent number: 7218059
    Abstract: A discharge-lamp control device for lighting a discharge-lamp includes two electrodes, first and second driving units to supply power to the discharge-lamp through the electrodes, respectively. Each driving unit includes a transformer having primary and secondary coils and a capacitor connected in parallel to the secondary coil. The first driving unit has impedance characteristics with a minimum impedance at a first frequency and a maximum impedance at a second frequency lower than the first frequency. The second driving unit has impedance characteristics having a minimum impedance at a third frequency and a maximum impedance at a fourth frequency lower than the third frequency. The first frequency is set to be higher than the third frequency. The second frequency is set to be lower than the fourth frequency. An operating frequency of the driving circuit is selected within a frequency bandwidth from the fourth frequency to the third frequency.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: May 15, 2007
    Assignee: TDK Corporation
    Inventors: Ge Li, Koichiro Miura, Takeshi Uematsu
  • Publication number: 20060193154
    Abstract: A power supply device includes two input ports, two output ports, a transformer having primary and secondary windings, switching means, and a controller. The switching means includes a switching element connected in series with the primary winding, and a capacitor. The controller switches the switching element to energize the transformer and charge the capacitor. When an AC power failure such as instantaneous interruption occurs, energy stored in the capacitor is discharged to flow through the primary winding. Accordingly, the transformer is energized to maintain generating an output power from the power supply device for a certain time period. The capacitor is provided on a primary side of the transformer, generally higher voltage side, in the power supply device, so that a smaller capacitance of the capacitor can be used.
    Type: Application
    Filed: February 24, 2006
    Publication date: August 31, 2006
    Applicant: TDK CORPORATION
    Inventor: Takeshi Uematsu
  • Publication number: 20060187685
    Abstract: A power supply device has first and second terminals, a transformer, a switching element, and auxiliary power supply means. The first and second terminals receive input power having an input voltage. The transformer has a primary winding and a secondary winding. The primary winding has a pair of winding terminals. One of the pair of winding terminals is connected to the first terminal. The switching element is connected between the second terminal and the other of the pair of winding terminals of the primary winding. The auxiliary power supply means feeds electric power to the transformer when the input voltage decreases to or less than a predetermined value. The auxiliary power supply means has a capacitor and a second switching mean for storing energy from the primary winding into the first capacitor during a normal operation of the power supply device.
    Type: Application
    Filed: February 15, 2006
    Publication date: August 24, 2006
    Applicant: TDK Corporation
    Inventor: Takeshi Uematsu
  • Publication number: 20060164869
    Abstract: An inverter circuit has a switching element, an inductance, a transformer, a capacitor, and a controller. The switching element is connectable between a higher potential terminal and a lower potential terminal of a direct-current power supply. The inductance is connected between the higher potential terminal and the switching element. The transformer has a primary winding and a secondary winding. The secondary winding has two ends. The capacitor is connected to the primary winding in series. The series-connected capacitor and primary winding is connected in parallel to the switching element. The controller switches the switching element. Therefore, the inverter circuit converts a direct current supplied from the direct-current power supply to an alternating current. The number of switching element in the inverter circuit is only one so that the structure of the inverter circuit is simplified and the manufacturing cost thereof can be reduced.
    Type: Application
    Filed: January 20, 2006
    Publication date: July 27, 2006
    Applicant: TDK Corporation
    Inventor: Takeshi Uematsu
  • Patent number: 7078884
    Abstract: A selector sets respective phases of pulse driving signals in reverse when a proportion signal or integration signal does not exceed a threshold. Shifting the respective phases of the pulse driving signals from each other lowers the ripple voltage. When the load current increases drastically, the output voltage Vo tends to decrease remarkably because of the shortage of capacity in the power supply. In this case, when the proportion signal or integration signal exceeds its corresponding threshold, a phase control unit causes the pulse driving signals to synchronize their phases, i.e., the selector supplies the same ramp wave to the comparators, so that respective output voltages supplied from the DC voltage converter circuits attain the same phase, thereby restraining the output voltage supplied to the load from decreasing remarkably.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: July 18, 2006
    Assignee: TDK Corporation
    Inventors: Koichiro Miura, Takeshi Uematsu, Hiroshi Kawasaki, Takakazu Imai, Ken Matsuura