Patents by Inventor Hiroshi Yoshikawa

Hiroshi Yoshikawa 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: 20240094758
    Abstract: The stabilized voltage generation circuit includes: a first voltage generation circuit configured to generate a first voltage with positive temperature characteristics; and a second voltage generation circuit including a first MOSFET having a gate of a first conductivity type and a second MOSFET having a gate of a second conductivity type different from the first conductivity type and configured to generate a second voltage with negative temperature characteristics based on the difference in gate threshold voltage between the first and second MOSFETs. The output voltage is generated based on the sum voltage of the first and second voltages.
    Type: Application
    Filed: November 28, 2023
    Publication date: March 21, 2024
    Inventor: Hiroshi YOSHIKAWA
  • Publication number: 20230196722
    Abstract: A learning apparatus trains an estimator that executes a recognition task. The learning apparatus comprises: an obtaining unit configured to obtain a plurality of training data items including input data and supervisory data corresponding to the input data; a calculating unit configured to calculate statistic information relating to a predetermined perspective in the plurality of training data items; a determining unit configured to determine a degree of importance of each training data item included in the plurality of training data items based on the statistic information; and a control unit configured to control training of the estimator based on the degree of importance. The determining unit determines the degree of importance of each training data item such that unevenness of the plurality of training data items with respect to the predetermined perspective is reduced.
    Type: Application
    Filed: December 15, 2022
    Publication date: June 22, 2023
    Inventors: Hiroshi YOSHIKAWA, Takamasa TSUNODA
  • Publication number: 20230109640
    Abstract: A skeleton detection system includes, a first storage unit configured to store reference operation information related to at least one cycle of a reference operation being a repetitive operation performed by an operator, a skeleton information detection unit configured to detect skeleton information about the operator from a working video obtained by capturing the operator during work, and a target identification unit configured to identify, as a target, among pieces of skeleton information about a plurality of operators during work, detected by the skeleton information detection unit, skeleton information about an operator indicating an operation satisfying a target requirement that a difference between the reference operation information and inspection target information being operation information during work falls within a preset allowable operation range.
    Type: Application
    Filed: December 12, 2022
    Publication date: April 6, 2023
    Applicants: DAICEL CORPORATION, HITACHI, LTD.
    Inventors: Yasutsugu Toyoda, Yasuhiko Inadomi, Yuki Ishito, Toshihiro Yamada, Hiroshi Yoshikawa
  • Publication number: 20230019417
    Abstract: A garbage disposal support apparatus capable of reducing the load on a person disposing of garbage is achieved. A garbage disposal support apparatus includes: a position obtaining unit configured to obtain position information about a person having an object; an object image obtaining unit configured to obtain image information about the object that the person has; a garbage determination unit configured to check the image information about the object that the person has against garbage image information stored in a database, and determine whether the object is garbage or not; a route generation unit configured to generate route information to a disposal place of the garbage, based on the position information about the person and on disposal place information stored in the database, if the object is garbage; and a transmitter unit configured to transmit the route information to a display apparatus.
    Type: Application
    Filed: September 13, 2022
    Publication date: January 19, 2023
    Inventors: Masaya MIHARA, Hiroshi TAKESHITA, Ayako KONDO, Tomoki SUGIYAMA, Tadashi FURUKAWA, Toshitaka MURATA, Toshihide KOBAYASHI, Hiroshi YOSHIKAWA, Ryohei SUNAGA
  • Publication number: 20230010300
    Abstract: There is provided a technique that includes: a first voltage generation circuit configured to generate a first voltage having a positive temperature characteristic; a second voltage generation circuit that includes a first MOSFET having a gate of a first conductive type and a second MOSFET having a gate of a second conductive type different from the first conductive type, and configured to generate a second voltage having a negative temperature characteristic based on a difference in gate threshold voltages between the first MOSFET and the second MOSFET; and a comparator configured to output a temperature detection signal indicating a high/low relationship between a detection target temperature and a predetermined temperature, based on the first voltage and the second voltage.
    Type: Application
    Filed: June 10, 2022
    Publication date: January 12, 2023
    Inventor: Hiroshi Yoshikawa
  • Publication number: 20220382229
    Abstract: A machining condition searching method includes: generating a machining condition to be set in a machining device; collecting a machining state; collecting the machining result performed under the machining condition; calculating an evaluation value of the machining on the basis of the machining result; constructing an evaluation value prediction model predicting, on the basis of the machining condition, the machining state, and the evaluation value, an evaluation value corresponding to the machining condition that has not been tried; and constructing the evaluation value prediction model on the basis of a change degree in the relationship between the machining condition and the evaluation value, and performs weighting based on the machining state on the evaluation value prediction model. The machining condition to be tried next is generated using a predictive value of the evaluation value. Each of the above processes is repeatedly performed until it is determined to end a search.
    Type: Application
    Filed: August 11, 2022
    Publication date: December 1, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hideyuki MASUI, Hiroshi YOSHIKAWA, Jun MARUTA, Koki NAKANE, Takayuki NAKAGAWA
  • Patent number: 11513013
    Abstract: A stress distribution measurement device includes: a first magnetostrictive sensor and a second magnetostrictive sensor each including an excitation coil that excites AC magnetism in a measurement target using alternating current, and a detection coil to which alternating current is induced due to the AC magnetism flowing in the measurement target; an excitation circuit that applies a first excitation voltage to the excitation coil of the first magnetostrictive sensor and applies a second excitation voltage to the excitation coil of the second magnetostrictive sensor, the second excitation voltage having a phase or a waveform different from the first excitation voltage; and a detection circuit that includes a first detector that performs synchronous detection of current flowing in the detection coil of the first magnetostrictive sensor based on the first excitation voltage and a second detector that performs synchronous detection of current flowing in the detection coil of the second magnetostrictive sensor b
    Type: Grant
    Filed: September 1, 2020
    Date of Patent: November 29, 2022
    Assignee: Hitachi, Ltd.
    Inventors: Masanori Kitaoka, Hisashi Endo, Hiroshi Yoshikawa, Toshihiro Yamada, Nobuhiro Kakeno
  • Publication number: 20220283035
    Abstract: A burner work measurement system configured to measure work using a burner is provided. The burner work measurement system includes one or more cameras configured to capture the work and a control unit configured to perform computing processing on images captured by the cameras, the control unit is configured to create work data obtained by calculating, based on the images captured by the cameras, at least one of a positional relation between a work object and the burner or flame, a positional relation between the work object and a brazing filler metal, and a positional relation between the burner or the flame and the brazing filler metal.
    Type: Application
    Filed: August 28, 2020
    Publication date: September 8, 2022
    Applicants: Hitachi, Ltd., Daikin Industries, Ltd.
    Inventors: Akihide TANAKA, Hiroshi YOSHIKAWA, Shinya KANEKO, Isamu TAKAHASHI, Naoya OKIZAKI, Xudong ZHANG, Yasunori HAMA
  • Patent number: 11325209
    Abstract: To improve quality control of welding, there is included in resistance welding: a magnetic field measuring unit (205) disposed around a welded part and configured to measure a local current at the welded part; a high-speed camera (202) configured to capture an image for measuring local temperature at the welded part from variation of luminance of emission by capturing light emission state of the welded part; a comparison determination unit (106) configured to determine whether or not at least one of current information and temperature information has an abnormal value by comparing the current information calculated based on magnetic field information acquired from the magnetic field measuring unit with past current information and comparing the temperature information measured from an image of the high-speed camera (202) with past temperature information.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: May 10, 2022
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Endoh, Hiroshi Yoshikawa, Toshihiro Yamada
  • Publication number: 20220057789
    Abstract: A manufacturing monitoring assistance device includes: a model creation unit creating a computation model when a product as a sample is normal, based on a three-dimensional form acquired from the product; a simulation unit creating a corrective computation model when the product is abnormal, by adding a sample of an abnormal portion in the product to the created computation model, and performing a simulation on each of the computation model and the corrective computation model; and a monitoring method determination unit determining a method for monitoring a manufacturing process for the product, based on an abnormality index being a difference between an output from a sensor as a result of the simulation performed on the computation model and an output from a sensor as a result of the simulation performed on the corrective computation model, and causing an output device to display the determined method and the abnormality index.
    Type: Application
    Filed: January 30, 2020
    Publication date: February 24, 2022
    Applicant: HITACHI, LTD.
    Inventors: Masanori KITAOKA, Hisashi ENDOU, Nobuhiro KAKENO, Hiroshi YOSHIKAWA, Toshihiro YAMADA
  • Patent number: 11150196
    Abstract: The disclosure provides a joining process line monitoring system capable of preventing joining quality deterioration and operation delay.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: October 19, 2021
    Assignee: HITACHI, LTD.
    Inventors: Hisashi Endou, Masanori Miyagi, Hiroshi Yoshikawa, Toshihiro Yamada, Nobuhiro Kakeno, Yasunori Hama
  • Patent number: 11146748
    Abstract: An imaging device includes pixel units, a control unit, and a correction unit. The control unit causes each pixel unit to output first and second signal. The first signal is a potential of a floating diffusion held when the charge accumulated in a photoelectric conversion unit is transferred upon a transfer switch being closed. The second signal is a potential of the floating diffusion held when a reset switch is closed with the transfer switch being open. The correction unit generates, with respect to the first and second signals output by each pixel unit, the pixel signal by subtracting a correction amount from a signal intensity of the first signal. The correction amount is a product of a signal intensity of the second signal and a coefficient determined in advance in accordance with a position of each pixel unit.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: October 12, 2021
    Assignee: JVCKENWOOD CORPORATION
    Inventor: Hiroshi Yoshikawa
  • Patent number: 11029254
    Abstract: There are provided a welding monitoring system which can multidimensionally monitor a welding portion with high accuracy and a monitoring method thereof, by using a relatively simple configuration.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: June 8, 2021
    Assignee: HITACHI, LTD.
    Inventors: Ryoji Nakagawa, Hisashi Endou, Hiroshi Yoshikawa, Toshihiro Yamada, Nobuhiro Kakeno
  • Patent number: 10979694
    Abstract: To perform a high-accuracy three-dimensional measurement by performing an appropriate calibration in accordance with various temperature changes, an information processing apparatus that decides a temperature-dependent parameter of a projection apparatus configured to project a pattern onto a measurement target object to perform a three-dimensional measurement includes a holding unit configured to hold a relationship in which the temperature-dependent parameter of the projection apparatus is set as a temperature function, a temperature input unit configured to input a temperature of the projection apparatus, and a temperature-dependent parameter decision unit configured to decide the temperature-dependent parameter of the projection apparatus based on the temperature of the projection apparatus which is input by the temperature input unit and the relationship.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: April 13, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Kotake, Masakazu Tohara, Hiroshi Yoshikawa
  • Publication number: 20210063316
    Abstract: The disclosure provides a joining process line monitoring system capable of preventing joining quality deterioration and operation delay.
    Type: Application
    Filed: August 30, 2018
    Publication date: March 4, 2021
    Inventors: Hisashi ENDOU, Masanori MIYAGI, Hiroshi YOSHIKAWA, Toshihiro YAMADA, Nobuhiro KAKENO, Yasunori HAMA
  • Publication number: 20210063255
    Abstract: A stress distribution measurement device includes: a first magnetostrictive sensor and a second magnetostrictive sensor each including an excitation coil that excites AC magnetism in a measurement target using alternating current, and a detection coil to which alternating current is induced due to the AC magnetism flowing in the measurement target; an excitation circuit that applies a first excitation voltage to the excitation coil of the first magnetostrictive sensor and applies a second excitation voltage to the excitation coil of the second magnetostrictive sensor, the second excitation voltage having a phase or a waveform different from the first excitation voltage; and a detection circuit that includes a first detector that performs synchronous detection of current flowing in the detection coil of the first magnetostrictive sensor based on the first excitation voltage and a second detector that performs synchronous detection of current flowing in the detection coil of the second magnetostrictive sensor b
    Type: Application
    Filed: September 1, 2020
    Publication date: March 4, 2021
    Inventors: Masanori KITAOKA, Hisashi ENDO, Hiroshi YOSHIKAWA, Toshihiro YAMADA, Nobuhiro KAKENO
  • Patent number: 10935500
    Abstract: There are provided a welding monitoring system which can multidimensionally monitor a welding portion with high accuracy and a monitoring method thereof, by using a relatively simple configuration.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: March 2, 2021
    Assignee: HITACHI, LTD.
    Inventors: Ryoji Nakagawa, Hisashi Endou, Hiroshi Yoshikawa, Toshihiro Yamada, Nobuhiro Kakeno
  • Publication number: 20200361023
    Abstract: Provided is a welding management system that appropriately manages welding. The welding management system (100) includes a plurality of local magnetic sensors (10a to 10f) provided around a target joining position (K) and a correction magnetic sensor (20) curved to surround the target joining position (K). A data processing unit (30) generates information of a joining state of the target joining position (K) based on a difference between a detection value of each of the plurality of the local magnetic sensors (10a to 10f) and a detection value of the correction magnetic sensor (20).
    Type: Application
    Filed: March 30, 2018
    Publication date: November 19, 2020
    Inventors: Ryoji NAKAGAWA, Hisashi ENDOU, Hiroshi YOSHIKAWA, Toshihiro YAMADA, Nobuhiro KAKENO, Hideya ISAKA
  • Patent number: 10804776
    Abstract: An injection molding device includes: a lower die that supports a rotor core; an intermediate die including a magnetizing mechanism; and an upper die including an injection die having a gate formed therein through which a molten bonded-magnet material supplied from a supply source is injected into a magnet insertion hole in the rotor core. The injection die has a cylindrical protruding portion at an end surface of which the gate is open. In the protruding portion, a magnetic-flux applying member containing ferromagnetic material is embedded with its side surface exposed at an outer peripheral surface of the protruding portion. The magnetizing mechanism is formed in an annular shape that can accommodate, inside its inner periphery, the rotor core and a distal end portion of the protruding portion by disposing yokes and permanent magnets alternately in the circumferential direction. Magnetic-path surfaces of the yokes radially face the side surface.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: October 13, 2020
    Assignee: JTEKT CORPORATION
    Inventors: Koji Tachi, Hiroshi Yoshikawa, Naotake Kanda, Taiki Takeuchi, Shohei Ogi
  • Patent number: 10767656
    Abstract: In an axial flow fan according to the present invention, a plurality of blades rotate about a rotation axis of the blades to convey a fluid. In the axial flow fan, the plurality of blades each have a leading edge at a leading side in a rotational direction, a trailing edge at a trailing side in the rotational direction, and an outer peripheral edge connecting the leading edge and the trailing edge. The leading edge of one of the plurality of blades and the trailing edge of another blade adjacent to the leading edge of the blade in the rotational direction are connected by a plate-shaped connection portion. The plurality of blades each have at least one plate-shaped reinforcement rib extending from a periphery of the rotation axis toward the outer peripheral edge of the blade.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: September 8, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Hamada, Koji Sachimoto, Yosuke Kikuchi, Hajime Ikeda, Takashi Kobayashi, Seiji Hirakawa, Hiroshi Yoshikawa, Hidetomo Nakagawa, Hiroaki Makino