Patents by Inventor Mitsuhiro Iwasaki

Mitsuhiro Iwasaki 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: 20250070642
    Abstract: In a drive circuit of a voltage-driven power semiconductor switching element, a drive circuit capable of performing efficient switching control according to a drive condition with a relatively simple configuration is provided. The drive circuit includes the voltage-driven switching element, an on-circuit that injects a charge into a gate of the voltage-driven switching element in response to a drive signal, and an off-circuit that extracts the charge from the gate of the voltage-driven switching element in response to a drive signal. In the drive circuit, the injection of the charge into the gate of the voltage-driven switching element or the extraction of the charge from the gate by pulse driving of the on-circuit or the off-circuit, and switching time of the voltage-driven switching element is controlled.
    Type: Application
    Filed: December 14, 2021
    Publication date: February 27, 2025
    Applicant: Hitachi Astemo, Ltd.
    Inventors: Yoshiaki MIZUHASHI, Masahiro DOI, Mitsuhiro IWASAKI
  • Patent number: 12164352
    Abstract: There is provided an electronic control device in which a microcomputer and a power source IC are mounted, the electronic control device having high reliability and being capable of performing fixation diagnosis of a safety control signal of the power source IC before activation of the microcomputer. The electronic control device includes a microcomputer, and a power source IC that communicates with the microcomputer. The power source IC includes a monitoring circuit that monitors the microcomputer, a safety processing circuit that outputs a safety control signal when the monitoring circuit determines an occurrence of an abnormality in the microcomputer, and a diagnosis circuit that diagnoses whether or not the safety control signal has a fixation failure. The diagnosis circuit detects whether or not the fixation failure has occurred, based on states of the safety control signal before and after the safety control signal is activated after activation of a power source.
    Type: Grant
    Filed: May 7, 2021
    Date of Patent: December 10, 2024
    Assignee: Hitachi Astemo, Ltd.
    Inventors: Mitsuhiro Iwasaki, Yuri Moizumi, Masahiro Doi, Takeo Yamashita
  • Publication number: 20240371212
    Abstract: To provide a highly reliable electronic control device in which an excitation amplifier that outputs an excitation signal to a resolver, a microcomputer, and a power supply IC are mounted, the electronic control device being capable of performing abnormality diagnosis of the excitation amplifier before activation and during operation of a system. An electronic control device includes a power supply IC; a microcomputer to which a power supply voltage is supplied from the power supply IC; an excitation amplifier that excites the resolver; and a diagnostic circuit that monitors an input signal and an output signal of the excitation amplifier and diagnoses abnormality; where the diagnostic circuit compares the input signal with the output signal to perform abnormality diagnosis of the excitation amplifier, and transmits a diagnosis result to the microcomputer.
    Type: Application
    Filed: March 4, 2022
    Publication date: November 7, 2024
    Inventors: Mitsuhiro IWASAKI, Masahiro DOI, Takeo YAMASHITA, Shinichirou HIDA, Yoshiaki MIZUHASHI
  • Publication number: 20230324971
    Abstract: There is provided an electronic control device in which a microcomputer and a power source IC are mounted, the electronic control device having high reliability and being capable of performing fixation diagnosis of a safety control signal of the power source IC before activation of the microcomputer. The electronic control device includes a microcomputer, and a power source IC that communicates with the microcomputer. The power source IC includes a monitoring circuit that monitors the microcomputer, a safety processing circuit that outputs a safety control signal when the monitoring circuit determines an occurrence of an abnormality in the microcomputer, and a diagnosis circuit that diagnoses whether or not the safety control signal has a fixation failure. The diagnosis circuit detects whether or not the fixation failure has occurred, based on states of the safety control signal before and after the safety control signal is activated after activation of a power source.
    Type: Application
    Filed: May 7, 2021
    Publication date: October 12, 2023
    Inventors: Mitsuhiro IWASAKI, Yuri MOIZUMI, Masahiro DOI, Takeo YAMASHITA
  • Publication number: 20230268822
    Abstract: Provided is an inverter device that quickly detects an abnormality of a power device, which is an output unit of the inverter device, and of gate drive to be able to safely control and stop the inverter device. The inverter device includes a gate voltage detection unit 19 that detects a gate voltage VG of the power device with respect to a given threshold voltage, and a drain voltage detection unit 30 that detects a drain voltage with respect to a given threshold voltage. A microcontroller 10 compares a gate drive signal 40 with a gate voltage detection signal 41 to make a diagnosis and compares the gate drive signal 40 with a drain voltage detection signal 42 to make a diagnosis, thereby making a diagnosis on normal drive and detection of the gate voltage VG and on normal drive and detection of the power device. In addition, by generating a gate drive signal to the power device, from a gate voltage detection signal from a counter power device, a dead time is reduced.
    Type: Application
    Filed: February 5, 2021
    Publication date: August 24, 2023
    Applicant: Hitachi Astemo, Ltd.
    Inventors: Masahiro DOI, Takeo YAMASHITA, Mitsuhiro IWASAKI
  • Publication number: 20230114063
    Abstract: An electronic control device for power conversion having an integrated safety function and improved reliability includes: a power module for converting DC power into AC power and supply the AC power to a motor; a gate driver for controlling the power module; a microcontroller for controlling the gate driver: a power supply IC for supplying power to at least one of the gate driver and the microcontroller: a discharge circuit for discharging a high voltage supplied to the power module; and a sensor. The power supply IC includes a microcomputer abnormality detection circuit for detecting an abnormality of the microcontroller and a safety processing circuit for determining necessity of safety processing based on an output of at least one of the microcomputer abnormality detection circuit and the sensor and performs the safety processing. The safety processing circuit stops the motor or discharges a high voltage using the discharge circuit.
    Type: Application
    Filed: December 28, 2020
    Publication date: April 13, 2023
    Applicant: Hitachi Astemo, Ltd.
    Inventors: Mitsuhiro IWASAKI, Masahiro DOI, Takeo YAMASHITA, Hitomi AOYAMA, Shinichirou HIDA
  • Publication number: 20220326614
    Abstract: Provided is a high-sensitive photosensitive resin composition which contains a black colorant and by which development and pattern formation are possible even with a low exposure amount. A positive-type photosensitive resin composition according to one embodiment contains: a first resin (A) having a plurality of phenolic hydroxyl groups, at least some of which are protected with an acid-labile group; a second resin (B) having an epoxy group and a phenolic hydroxyl group; at least one colorant (C) selected from the group consisting of a black dye and a black pigment; and a photoacid generator (D).
    Type: Application
    Filed: June 3, 2020
    Publication date: October 13, 2022
    Applicant: SHOWA DENKO K.K.
    Inventors: Yasuhiro ISHIDA, Kentaro FURUE, Yoshikazu ARAI, Mitsuhiro IWASAKI, Hideo HORIBE
  • Patent number: 7038075
    Abstract: The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) wherein R2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: May 2, 2006
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Masahide Tanaka, Kozo Matsui, Tadashi Katsura, Mitsuhiro Iwasaki, Hiroshi Maeda, Nobushige Itaya
  • Publication number: 20040138496
    Abstract: The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) 1
    Type: Application
    Filed: December 4, 2003
    Publication date: July 15, 2004
    Applicant: Sumika Fine Chemicals Co., Ltd.
    Inventors: Masahide Tanaka, Kozo Matsui, Tadashi Katsura, Mitsuhiro Iwasaki, Hiroshi Maeda, Nobushige Itaya
  • Patent number: 6730803
    Abstract: The &bgr;-keto ester compound, &bgr;-hydroxy acid compound and acetonide form of a 1,3-diol derivative of the formulas (I), (V) and (VIII) wherein each symbol is as defined in the specification, are useful as a synthetic intermediate for an epothilone derivative being developed as a pharmaceutical agent having an antitumor activity.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: May 4, 2004
    Assignee: Sumika Fine Chemicals Co., Ltd.
    Inventors: Mitsuhiro Iwasaki, Kiyoshi Sugi, Hideto Miyamoto, Nobushige Itaya
  • Patent number: 6683207
    Abstract: The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) wherein R2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: January 27, 2004
    Assignee: Sumika Fine Chemicals Co., Ltd.
    Inventors: Masahide Tanaka, Kozo Matsui, Tadashi Katsura, Mitsuhiro Iwasaki, Hiroshi Maeda, Nobushige Itaya
  • Publication number: 20030176507
    Abstract: The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) 1
    Type: Application
    Filed: December 16, 2002
    Publication date: September 18, 2003
    Applicant: Sumika Fine Chemicals Co., Ltd.
    Inventors: Masahide Tanaka, Kozo Matsui, Tadashi Katsura, Mitsuhiro Iwasaki, Hiroshi Maeda, Nobushige Itaya
  • Publication number: 20030144533
    Abstract: The &bgr;-keto ester compound, &bgr;-hydroxy acid compound and acetonide form of a 1,3-diol derivative of the formulas (I), (V) and (VIII) 1
    Type: Application
    Filed: September 30, 2002
    Publication date: July 31, 2003
    Applicant: Sumika Fine Chemicals Co., Ltd.
    Inventors: Mitsuhiro Iwasaki, Kiyoshi Sugi, Hideto Miyamoto, Nobushige Itaya
  • Patent number: 4644980
    Abstract: A device for weft insertion has a weft guide channel defined by a number of reed teeth or weft yarn guide members arranged in juxtaposition to the reed, and at least two main nozzles that are used selectively for weft insertion. At least one weft-inserting main nozzle adapted to project the weft yarn towards the weft yarn guide channel has its fluid jet opening directed parallel to the longitudinal axis of the weft guide channel, the other weft-inserting main nozzles having their jet axes inclined with respect to the longitudinal axis of the weft yarn guide channel and directed both downstream of the channel and towards the recessed wall surface opposite to the open side of the channel.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: February 24, 1987
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Kinpei Mitsuya, Mitsuhiro Iwasaki
  • Patent number: D284014
    Type: Grant
    Filed: July 10, 1984
    Date of Patent: May 27, 1986
    Assignee: Shachihata Industrial Co., Ltd.
    Inventors: Mitsuhiro Iwasaki, Takashi Ichikawa