Patents by Inventor Yuki Kawai

Yuki Kawai 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: 20240195326
    Abstract: Adders (52, 54) output an upper limit (Iup) and a lower limit (Ilw) of a hysteresis band, using a hysteresis width (BW) set in accordance with a target value (ftrg) of switching frequency and current command value (ia*). A hysteresis comparator (60) outputs a result of comparison of reactor current (ia) with the upper limit (Iupc) and the lower limit (Ilwc) after dead time compensation by dead time compensation units (72, 74). A dead time generator (70) generates a gate signal (S1a, S1b) of a switching element such that a dead time is given, based on an output signal of the hysteresis comparator (60). The dead time compensation units (72, 74) add a compensation amount with a different polarity to a different one of the upper limit (Iup) and the lower limit (Ilw) between when the reactor current (ia) is positive and when it is negative.
    Type: Application
    Filed: April 23, 2021
    Publication date: June 13, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuki ITOGAWA, Yu KAWAI, Takeshi AMIMOTO
  • Patent number: 12008468
    Abstract: Each of learning nodes calculates gradients of a loss function from an output result obtained by inputting learning data to a learning target neural network, converts a calculation result into a packet, and transmits the packet to a computing interconnect device. The computing interconnect device receives the packet transmitted from each of the learning nodes, acquires a value of the gradients stored in the packet, calculates a sum of the gradients, converts a calculation result into a packet, and transmits the packet to each of the learning nodes. Each of the learning nodes receives the packet transmitted from the computing interconnect device and updates a constituent parameter of a neural network based on a value stored in the packet.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: June 11, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Junichi Kato, Kenji Kawai, Huycu Ngo, Yuki Arikawa, Tsuyoshi Ito, Takeshi Sakamoto
  • Publication number: 20240170725
    Abstract: Provided is an electrolytic solution that includes: an electrolyte containing lithium salt; and a nonaqueous solvent containing cyclic alkylene carbonate and methyl propionate, the electrolyte contains lithium salt other than LiPF6 in an amount of not less than 30 mol % with respect to a total amount of the lithium salt, and the nonaqueous solvent contains 75 volume % or more of the methyl propionate.
    Type: Application
    Filed: January 18, 2022
    Publication date: May 23, 2024
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tomoyuki KAWAI, Yuki ICHIKAWA, Hiroshi IWATA, Satomi YOKOCHI, Keisuke NATSUI, Yuuhi SATO, Kumiko KOJIMA, Kisena YOSHIDA
  • Publication number: 20240136102
    Abstract: A winding of a transmission coil included in a power transmission device of a contactless power feed apparatus and serving to transmit AC power to a power reception device contactlessly is formed of a wiring pattern provided on a substrate. The transmission coil is divided into partial coils arranged coaxially. Each of the partial coils is formed such that, among the partial coils, a number of turns of a winding included in a partial coil is larger as the partial coil is located more outwardly.
    Type: Application
    Filed: September 6, 2023
    Publication date: April 25, 2024
    Applicant: OMRON Corporation
    Inventors: Goro NAKAO, Yuki ITO, Taichi MISHIMA, Yusuke KAWAI, Hiroyuki IBUKI, Yoshihisa ISHIKAWA
  • Patent number: 11962257
    Abstract: A blower in one aspect of the present disclosure includes: a housing including a first discharge port; a motor in the housing; a fan in the housing; an attachment fitting portion; and a motor drive circuit. The attachment fitting portion is configured to detachably attach, to the first discharge port, an attachment including a second discharge port. The motor drive circuit (i) delivers a designated power to the motor and (ii) performs a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.
    Type: Grant
    Filed: August 29, 2022
    Date of Patent: April 16, 2024
    Assignee: MAKITA CORPORATION
    Inventors: Yuki Kawai, Naoya Asami
  • Publication number: 20240118637
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer provided on the conductive substrate, a charge generation layer provided on the undercoat layer, a charge transport layer provided on the charge generation layer, and a surface protective layer provided on the charge transport layer, in which a dark decay is 85 V/sec or greater in a case where the electrophotographic photoreceptor is contact-charged with a DC voltage.
    Type: Application
    Filed: August 7, 2023
    Publication date: April 11, 2024
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Satoshi MIZOGUCHI, Takeshi KAWAI, Masaki HIRAKATA, Yuki YONETOKU, Hideya KATSUHARA
  • Publication number: 20240101396
    Abstract: A method for using a lifting magnet and a lifting magnet. The lifting magnet includes a plurality of electromagnet coils that are each independently ON/OFF-controllable and voltage-controllable, and a magnetic pole that is excited by application of a voltage to the electromagnet coils. An electromagnet coil to be used for lifting steel plates is determined based on a total thickness of the steel plates to be lifted. An amount of passing magnetic flux ?r in the magnetic pole in a case where magnetic flux passes through only the steel plates to be lifted when the electromagnet coil is used is calculated. An application voltage to be applied to the electromagnet coil used for lifting the steel plates is determined based on the amount of passing magnetic flux ?r. The application voltage is applied to the electromagnet coil.
    Type: Application
    Filed: December 15, 2021
    Publication date: March 28, 2024
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuki TAKAKI, Yusaku TAKEMURA, Atsushi KURIMOTO, Ayaka KAWAI
  • Publication number: 20240096182
    Abstract: An action detection system (10) includes an action specification unit (18) configured to start specification of at least one action ID based on at least part of skeleton information extracted from video data that is a captured video of a user in response to detection of the user visiting checkout machine determined in advance, a determination unit (20) configured to determine whether or not an action sequence including the specified at least one action ID corresponds to registration action sequences registered in advance, and a processing control unit (21) configured to execute processing determined in advance in accordance with a determination result.
    Type: Application
    Filed: July 28, 2021
    Publication date: March 21, 2024
    Applicant: NEC Corporation
    Inventors: Ryo KAWAI, Noboru YOSHIDA, Jianquan LIU, Shunsuke TSUDA, Yuki TSURUOKA
  • Patent number: 11932235
    Abstract: A hybrid vehicle control method controls a hybrid vehicle having an electric power source, a vehicle electrical equipment and drive motor to which electric power is supplied from the electric power source. The vehicle electrical equipment and the drive motor are electrically connected to the electric power source via at least a shared harness. When a temperature of the harness is equal to or greater than a predetermined temperature, upper limit values of electric power supplied from the electric power source to the vehicle electrical equipment and the drive motor are both reduced, and a degree of reduction in the upper limit value for the vehicle equipment is greater than a degree of reduction in the upper limit value for the drive motor.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: March 19, 2024
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Sadaharu Narita, Yuki Kawai, Shunsuke Baba
  • Publication number: 20230075030
    Abstract: A blower in one aspect of the present disclosure includes: a housing including a first discharge port; a motor in the housing; a fan in the housing; an attachment fitting portion; and a motor drive circuit. The attachment fitting portion is configured to detachably attach, to the first discharge port, an attachment including a second discharge port. The motor drive circuit (i) delivers a designated power to the motor and (ii) performs a constant power control that maintains a magnitude of an electric power delivered to the motor at a magnitude of the designated power.
    Type: Application
    Filed: August 29, 2022
    Publication date: March 9, 2023
    Applicant: MAKITA CORPORATION
    Inventors: Yuki KAWAI, Naoya ASAMI
  • Publication number: 20230071190
    Abstract: A blower in one aspect of the present disclosure includes: a housing including a suction port and a discharge port; a motor in the housing; a fan in the housing; a motor drive circuit; and a control circuit. The control circuit detects an insufficient airflow from the suction port to the discharge port based on an operation parameter. The operation parameter is associated with an operation of the motor.
    Type: Application
    Filed: August 30, 2022
    Publication date: March 9, 2023
    Applicant: MAKITA CORPORATION
    Inventors: Yuki KAWAI, Naoya ASAMI
  • Patent number: 11571099
    Abstract: An interlocking adapter in one aspect of the present disclosure includes a current path, an electric load, a switch, and a controller. The controller turns on and off the switch in synchronization with a change of an alternating-current voltage received from an electric outlet of an electric apparatus in response to reception of an interlocking command signal from a working machine so as to supply a load current from the electric outlet to the electric load. The controller turns on and off the switch at a specified ratio of a time every ½ cycle of the alternating-current voltage.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: February 7, 2023
    Assignee: MAKITA CORPORATION
    Inventors: Hitoshi Suzuki, Yuki Kawai, Itsuku Kato, Yasutaka Hotta
  • Patent number: 11554409
    Abstract: A rebar tying tool (2; 302; 402) include a feed mechanism (24), which includes a first motor (32; 304) and feeds a wire (W), and a twisting mechanism, which includes a second motor (76; 306) and twists together one or more portions of the wire. A control unit (202; 350) controls the first motor and the second motor and includes a general-purpose I/O port (202c; 350c) and a motor-control-signal output port (202a; 350a). A motor-control-signal-output-destination-switching circuit (204; 310; 406) inputs motor-control signals (UH, VH, WH, UL, VL, WL) from the control unit via the motor-control-signal output port and selectively outputs the inputted motor-control signals to either the first motor or the second motor in response to input of a switching signal (SW).
    Type: Grant
    Filed: December 8, 2020
    Date of Patent: January 17, 2023
    Assignee: MAKITA CORPORATION
    Inventors: Shunta Mizuno, Masahiro Watanabe, Yuki Kawai
  • Patent number: 11529669
    Abstract: A rebar tying tool includes: a feed mechanism (24), which includes a first brushless motor (32) and performs an advancing process that advances a wire (W) and a draw-back process that draws back the wire (W); a first inverter circuit (212), which is electrically connected to the first brushless motor; and a control unit (202), which controls the first brushless motor via the first inverter circuit. The first brushless motor comprises a first Hall-effect sensor (180), which is disposed on a first sensor board (178). In the advancing process, the control unit performs lead-angle control on the first brushless motor at a first lead angle. In the draw-back process, the control unit performs lead-angle control on the first brushless motor at a second lead angle. The first lead angle is set to be larger than the second lead angle.
    Type: Grant
    Filed: December 8, 2020
    Date of Patent: December 20, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Shunta Mizuno, Yuki Kawai
  • Publication number: 20220371577
    Abstract: A hybrid vehicle control method controls a hybrid vehicle having an electric power source, a vehicle electrical equipment and drive motor to which electric power is supplied from the electric power source. The vehicle electrical equipment and the drive motor are electrically connected to the electric power source via at least a shared harness. When a temperature of the harness is equal to or greater than a predetermined temperature, upper limit values of electric power supplied from the electric power source to the vehicle electrical equipment and the drive motor are both reduced, and a degree of reduction in the upper limit value for the vehicle equipment is greater than a degree of reduction in the upper limit value for the drive motor.
    Type: Application
    Filed: August 19, 2020
    Publication date: November 24, 2022
    Inventors: Sadaharu NARITA, Yuki KAWAI, Shunsuke BABA
  • Patent number: 11509129
    Abstract: An electric working machine according to one aspect of the present disclosure comprises a motor, a rectifier circuit, a capacitor, a series switching element, a resistive element, a drive circuit, a peak voltage value acquirer, and a controller. The capacitor smooths power rectified by the rectifier circuit. The series switching element is coupled in series with the capacitor. The resistive element is coupled in parallel with the series switching element. The controller brings the series switching element into conduction in a case where AC power is inputted to the rectifier circuit and where a specified conducting condition based on a peak voltage value acquired by the peak voltage value acquirer is satisfied.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: November 22, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Yuki Kawai, Itsuku Kato
  • Patent number: 11466466
    Abstract: An electric power tool disclosed herein may include an actuator; a control unit; and a main switch. When the main power is on, the control unit may be capable of executing at least one sequence operation in which the actuator is operated according to a predetermined sequence. When the operation to switch the main power from on to off is performed on the main switch during execution of the at least one sequence operation: the main power may be kept on and electric power supply to the actuator may be continued until the at least one sequence operation under execution is completed; and the electric power supply to the actuator may be cut off and the main power may be switched from on to off after the at least one sequence operation under execution has been completed.
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: October 11, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Yuki Kawai, Kunihisa Shima
  • Patent number: 11149451
    Abstract: A tying machine may include a feeding mechanism configured to feed a tying string, a battery, and a voltage detection circuit configured to detect a voltage of the battery. The feeding mechanism may include a feeding motor to which power is supplied from the battery. The tying machine may be configured to set a duty ratio for driving the feeding motor when feeding the tying string, in accordance with the voltage of the battery detected by the voltage detection circuit.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: October 19, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Kunihisa Shima, Yuki Kawai
  • Patent number: 11117185
    Abstract: A fastening tool includes a housing, a fastener-abutment part, a pin-gripping part held within the fastener-abutment part to be movable in a front-rear direction relative to the fastener-abutment part, a detection-target part provided to move together with the pin-gripping part, a detection device configured to detect the detection-target part, a motor, and a driving mechanism configured to move the pin-gripping part rearward from an initial position relative to the fastener-abutment part. The driving mechanism is further configured to move the pin-gripping part forward relative to the fastener-abutment part so as to return the pin-gripping part to the initial position based on a detection result of the detection device. The fastening tool is configured such that a first moving distance is adjustable, the first moving distance being a distance by which the pin-gripping part is moved from a detection position to the initial position.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: September 14, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Michisada Yabuguchi, Yuki Kawai, Hiroki Ikuta
  • Patent number: 11065674
    Abstract: A fastening tool includes a fastener-abutment part, a pin-gripping part, a motor, a driving mechanism, an input-accepting part and a motor-control part. The fastener-abutment part is configured to abut on a cylindrical part of a fastener. The pin-gripping part is configured to grip a portion of a pin of the fastener. The driving mechanism is configured to be driven by power of the motor to move the pin-gripping part rearward along a driving axis relative to the fastener-abutment part, thereby fastening a workpiece via the fastener. The input-accepting part is configured to accept setting information for a control condition of the motor inputted via an operation part configured to be externally operated by a user. The motor-control part is configured to control operation of the driving mechanism by controlling driving of the motor according to the control condition based on the setting information accepted by the input-accepting part.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: July 20, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Yuki Kawai, Michisada Yabuguchi, Hiroki Ikuta, Toshihito Yabunaka