Patents by Inventor Tsuyoshi Nagano

Tsuyoshi Nagano 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: 20210013792
    Abstract: A gate driver for driving a gate of a switching element in accordance with an input signal is provided. The gate driver is configured to change a gate driving condition in accordance with a detected value of power supply voltage. Each time when the switching element is turned off, the gate driver stores a time width from a time when the input signal is switched to an off command to a time when switch-off surge occurs in the switching device. If it is determined that the gate driving condition should be changed during turn-off operation of the switching element, the gate driver switches the gate driving condition when a time corresponding to the time width stored at a previous turn-off is elapsed after a current turn-off of the switching element is started.
    Type: Application
    Filed: February 21, 2020
    Publication date: January 14, 2021
    Inventors: Kunio MATSUBARA, Tsuyoshi NAGANO
  • Publication number: 20210006146
    Abstract: A gate driver includes: a timing determination unit configured to measure an on-time of a switching element and configured to determine, based on the on-time, a certain timing during a turn-off period of the switching element as an intermediate timing; and a driving condition changing unit configured to change a gate driving condition of the switching element at the intermediate timing determined by the timing determination unit.
    Type: Application
    Filed: September 23, 2020
    Publication date: January 7, 2021
    Inventors: Tsuyoshi NAGANO, Kunio MATSUBARA
  • Publication number: 20200392361
    Abstract: The present invention relates to [1] a process for producing a pigment water dispersion liquid of polymer particles containing an azomethine metal complex pigment (A), said process including the step of subjecting a mixture containing the azomethine metal complex pigment (A), an uncrosslinked aromatic group-containing polymer (b) and water to dispersion treatment using a medialess disperser at an accumulated input energy of not more than 5.0 kWh/kg, [2] a pigment water dispersion liquid containing an azomethine metal complex pigment (A) and a polymer dispersant (B), in which in an optical absorption spectrum of the pigment water dispersion liquid, a ratio of a maximum absorbance (A1max) in a wavelength range of not less than 440 nm and less than 465 nm to a maximum absorbance (A2max) in a wavelength range of not less than 420 nm and less than 440 nm [(A1max)/(A2max)] is not less than 1.000, and [3] a water-based ink for ink-jet printing, containing the aforementioned pigment water dispersion liquid.
    Type: Application
    Filed: December 20, 2018
    Publication date: December 17, 2020
    Applicant: KAO CORPORATION
    Inventors: Kaname MITSUYOSHI, Tsuyoshi EGAWA, Tomohiko NAGANO, Yusuke SHIMIZU
  • Publication number: 20200389167
    Abstract: A gate drive apparatus is provided. The gate drive apparatus includes a gate drive unit configured to drive a gate of a switching device; a parameter measuring unit configured to measure a parameter corresponding to current flowing through the switching device; a discrepancy detection unit configured to detect discrepancy between current flowing through the switching device during an on-state of the switching device and a reference value, based on the parameter; and a control unit that, if the discrepancy is not detected, switches a change speed of a gate voltage of the switching device at a timing when a reference time has elapsed since a turn-off start of the switching device during a next turn-off time period of the switching device, and if the discrepancy is detected, keeps the change speed of the gate voltage during the next turn-off time period of the switching device.
    Type: Application
    Filed: February 19, 2020
    Publication date: December 10, 2020
    Inventors: Tsuyoshi NAGANO, Kunio MATSUBARA
  • Publication number: 20200389164
    Abstract: Provided is a driving apparatus that includes a gate driving circuit that turns off a first semiconductor element upon receiving a turn-off signal, a measuring circuit that measures a parameter according to a voltage applied to the second semiconductor element, a timing generating circuit that generates a timing signal if the parameter satisfies a first condition during a time period in which the first semiconductor element is tuned off; and a driving condition change circuit that, in response to the timing signal, further decreases a changing speed of a gate voltage of the first semiconductor element than a reference speed during the time period in which the first semiconductor element is tuned off, wherein the gate driving circuit turns off the first semiconductor element in response to that the parameter satisfies a second condition during a time period in which the first semiconductor element is tuned on.
    Type: Application
    Filed: February 19, 2020
    Publication date: December 10, 2020
    Inventors: Kunio MATSUBARA, Tsuyoshi NAGANO
  • Patent number: 10855272
    Abstract: A gate drive apparatus is provided. The gate drive apparatus includes a gate drive unit configured to drive a gate of a switching device; a parameter measuring unit configured to measure a parameter corresponding to current flowing through the switching device; a discrepancy detection unit configured to detect discrepancy between current flowing through the switching device during an on-state of the switching device and a reference value, based on the parameter; and a control unit that, if the discrepancy is not detected, switches a change speed of a gate voltage of the switching device at a timing when a reference time has elapsed since a turn-off start of the switching device during a next turn-off time period of the switching device, and if the discrepancy is detected, keeps the change speed of the gate voltage during the next turn-off time period of the switching device.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: December 1, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Tsuyoshi Nagano, Kunio Matsubara
  • Patent number: 10819212
    Abstract: A gate driver includes: a gate drive unit configured to drive a gate of a switching element in accordance with an input signal that commands to turn on or to turn off the switching element; a timing determination unit configured to measure an on-time width from when the input signal is switched to an on-command to when the input signal is switched to an off-command, and configured to determine, based on the measured on-time width, an intermediate timing that is before switch-off surge voltage of the switching element reaches a peak; and a driving condition changing unit configured to change a gate driving condition of the switching element at the intermediate timing determined by the timing determination unit.
    Type: Grant
    Filed: February 25, 2020
    Date of Patent: October 27, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Tsuyoshi Nagano, Kunio Matsubara
  • Publication number: 20200255683
    Abstract: The present invention relates to an ink set for ink-jet printing which contains at least a water-based ink (I) and a water-based ink (II) in which the water-based ink (I) contains a pigment (A1) having a barbituric acid-derived structure, and the water-based ink (II) contains a diketopyrrolopyrrole pigment (A2), an ink-jet printing method using the ink set, and an ink-jet printed material.
    Type: Application
    Filed: October 15, 2018
    Publication date: August 13, 2020
    Applicant: KAO CORPORATION
    Inventors: Tsuyoshi EGAWA, Kaname MITSUYOSHI, Tomohiko NAGANO
  • Patent number: 10637465
    Abstract: In recent years, it has been desired to further shorten the dead time. Provided is a driving device that drives on/off a main switching element to which a free wheeling diode is anti-parallel connected, wherein the driving device includes a determination unit configured to output a determination signal indicating whether free wheeling current is flowing from a source terminal to a drain terminal of the main switching element; and a drive control unit configured to reduce a switching speed when the main switching element is driven from an on-state to an off-state on condition that the determination signal indicating that the free wheeling current is flowing is output.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: April 28, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kunio Matsubara, Tsuyoshi Nagano
  • Publication number: 20200123402
    Abstract: The present invention relates to [1] a water-based ink for ink-jet printing which can be prevented from suffering from increased viscosity and flocculation of the ink upon storage thereof even when used in the form of a system containing a large amount of a solvent, said water-based ink for ink-jet printing containing crosslinked polymer particles containing a pigment having an indanthrone skeleton, an organic solvent and water, in which a crosslinking rate of the crosslinked polymer is not less than 10 mol % and not more than 90 mol %, and a content of the organic solvent in the water-based ink is not less than 30% by mass and not more than 65% by mass, and [2] an ink-jet printing method including the steps of loading the water-based ink as described in the above [1] to an ink-jet printing apparatus, and ejecting the water-based ink in the form of droplets of the ink onto a printing medium to form characters or images on the printing medium.
    Type: Application
    Filed: July 9, 2018
    Publication date: April 23, 2020
    Applicant: KAO CORPORATION
    Inventors: Tomohiko NAGANO, Kaname MITSUYOSHI, Tsuyoshi EGAWA
  • Patent number: 10608626
    Abstract: A driving apparatus is provided, the driving apparatus including: a gate driving unit that drives a semiconductor element; a sampling unit that samples, in an on-period of the semiconductor element, an observation value that changes according to an on-current flowing through the semiconductor element; and a changing unit that changes a driving condition under which the gate driving unit drives a gate of the semiconductor element when the semiconductor element is turned off according to the observation value sampled in an on-period of the semiconductor element.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: March 31, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kunio Matsubara, Tsuyoshi Nagano
  • Publication number: 20200036371
    Abstract: A driving device is provided, which drives on/off a main switching element to which a diode is anti-parallel connected, wherein the driving device includes a detection unit configured to detect a voltage between a drain terminal and a source terminal; a determination unit configured to output a determination signal indicating whether a free wheeling current is flowing from the source terminal to the drain terminal based on a detected voltage detected by the detection unit; and a drive control unit configured to perform control such that the main switching element is set in an on-state on condition that an on command signal for turning on the main switching element is input and on condition that the determination signal indicating that the free wheeling current is flowing is output.
    Type: Application
    Filed: June 3, 2019
    Publication date: January 30, 2020
    Inventors: Kunio MATSUBARA, Tsuyoshi NAGANO
  • Publication number: 20200036380
    Abstract: In recent years, it has been desired to further shorten the dead time. Provided is a driving device that drives on/off a main switching element to which a free wheeling diode is anti-parallel connected, wherein the driving device includes a determination unit configured to output a determination signal indicating whether free wheeling current is flowing from a source terminal to a drain terminal of the main switching element; and a drive control unit configured to reduce a switching speed when the main switching element is driven from an on-state to an off-state on condition that the determination signal indicating that the free wheeling current is flowing is output.
    Type: Application
    Filed: June 3, 2019
    Publication date: January 30, 2020
    Inventors: Kunio MATSUBARA, Tsuyoshi NAGANO
  • Patent number: 10547300
    Abstract: A driving device is provided, which drives on/off a main switching element to which a diode is anti-parallel connected, wherein the driving device includes a detection unit configured to detect a voltage between a drain terminal and a source terminal; a determination unit configured to output a determination signal indicating whether a free wheeling current is flowing from the source terminal to the drain terminal based on a detected voltage detected by the detection unit; and a drive control unit configured to perform control such that the main switching element is set in an on-state on condition that an on command signal for turning on the main switching element is input and on condition that the determination signal indicating that the free wheeling current is flowing is output.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: January 28, 2020
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kunio Matsubara, Tsuyoshi Nagano
  • Publication number: 20200019150
    Abstract: A collection device includes a reception unit, a first inspection unit, and a first transmission request unit. The reception unit receives a data unit including operation data indicating an operation state of a plant and a guarantee value for guaranteeing authenticity of the operation data. The first inspection unit inspects the authenticity of the data unit by inspecting a quality of the data unit on the basis of the guarantee value and by inspecting the presence or absence of a loss of the data on the basis of a reception interval of the data unit. The first transmission request unit requests a transmission side of the data unit to retransmit the data unit when inspection results of the first inspection unit indicate no authenticity.
    Type: Application
    Filed: September 1, 2017
    Publication date: January 16, 2020
    Inventors: Masato SHIDA, Yukihiko INOUE, Kuniaki AOYAMA, Ichiro NAGANO, Shun NIIZUMA, Akihisa ENDO, Takahiro YAMAUCHI, Tsuyoshi KINOSHITA, Shinsaku ENDO
  • Publication number: 20190384275
    Abstract: A diagnostic device includes a storage unit that stores first information including a first abnormal event which occurred in the past in a plant, a first attribution event that is a cause of the first abnormal event, and a first occurrence probability of the first attribution event, in which a causal relationship between the first abnormal and attribution events is indicated by a tree structure, and second information including a second abnormal event which is supposed to occur in the plant but does not occur yet, a second attribution event that is a cause of the second abnormal event, and a second occurrence probability of the second attribution event, in which a causal relationship between the second abnormal and attribution events is indicated by a tree structure; and an estimation unit that estimates the cause of the sign of the abnormality, based on the first and second information.
    Type: Application
    Filed: September 1, 2017
    Publication date: December 19, 2019
    Inventors: Masato SHIDA, Yukihiko INOUE, Kuniaki AOYAMA, Ichiro NAGANO, Shun NIIZUMA, Tomohiro BABA, Akihisa ENDO, Takahiro YAMAUCHI, Tsuyoshi KINOSHITA, Shinsaku ENDO, Yasuoki TOMITA, Katsuhiko ABE
  • Publication number: 20190190511
    Abstract: A driving apparatus is provided, the driving apparatus including: a gate driving unit that drives a semiconductor element; a sampling unit that samples, in an on-period of the semiconductor element, an observation value that changes according to an on-current flowing through the semiconductor element; and a changing unit that changes a driving condition under which the gate driving unit drives a gate of the semiconductor element when the semiconductor element is turned off according to the observation value sampled in an on-period of the semiconductor element.
    Type: Application
    Filed: October 23, 2018
    Publication date: June 20, 2019
    Inventors: Kunio MATSUBARA, Tsuyoshi NAGANO
  • Patent number: 7916393
    Abstract: The optical level control device independently controls the intensities of two beams having different wavelengths that are emitted from a laser oscillator, and the optical level control device includes a wavelength-dependent wavelength plate and a polarization beam splitter. The wavelength-dependent wavelength plate functions as a half-wave plate with respect to the first light wave and as a full-wave plate with respect to the second light wave. Only the rotation angle of the polarization beam splitter about the optical axis is adjusted to set the intensity of the second light wave transmitted rectilinearly through the polarization beam splitter. The polarization beam splitter is then fixed at the adjusted angle, and the rotation angle of the wavelength plate about the optical axis is adjusted to set the intensity of the first light wave.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: March 29, 2011
    Assignee: Laserfront Technologies, Inc.
    Inventors: Tsuyoshi Nagano, Yoshinori Ohta
  • Patent number: 7804644
    Abstract: The optical level control device independently controls the intensities of two beams having different wavelengths that are emitted from a laser oscillator, and the optical level control device includes a wavelength-dependent wavelength plate and a polarization beam splitter. The wavelength-dependent wavelength plate functions as a half-wave plate with respect to the first light wave and as a full-wave plate with respect to the second light wave. Only the rotation angle of the polarization beam splitter about the optical axis is adjusted to set the intensity of the second light wave transmitted rectilinearly through the polarization beam splitter. The polarization beam splitter is then fixed at the adjusted angle, and the rotation angle of the wavelength plate about the optical axis is adjusted to set the intensity of the first light wave.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: September 28, 2010
    Assignee: Laserfront Technologies, Inc.
    Inventors: Tsuyoshi Nagano, Yoshinori Ohta
  • Publication number: 20090161706
    Abstract: The optical level control device independently controls the intensities of two beams having different wavelengths that are emitted from a laser oscillator, and the optical level control device comprises a wavelength-dependent wavelength plate and a polarization beam splitter. The wavelength-dependent wavelength plate functions as a half-wave plate with respect to the first light wave and as a full-wave plate with respect to the second light wave. Only the rotation angle of the polarization beam splitter about the optical axis is adjusted to set the intensity of the second light wave transmitted rectilinearly through the polarization beam splitter. The polarization beam splitter is then fixed at the adjusted angle, and the rotation angle of the wavelength plate about the optical axis is adjusted to set the intensity of the first light wave.
    Type: Application
    Filed: January 16, 2009
    Publication date: June 25, 2009
    Applicant: Laserfront Technologies, Inc.
    Inventors: Tsuyoshi NAGANO, Yoshinori Ohta