Patents by Inventor Tomoyuki Ichikawa

Tomoyuki Ichikawa 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).

  • Patent number: 11362270
    Abstract: A magnetoresistance effect element includes a first ferromagnetic layer, a second ferromagnetic layer, and a tunnel barrier layer that is interposed between the first ferromagnetic layer and the second ferromagnetic layer. The tunnel barrier layer is a stacked body including one or more first oxide layers having a spinel structure and one or more second oxide layers having a spinel structure with a composition which is different from a composition of the first oxide layer.
    Type: Grant
    Filed: October 1, 2020
    Date of Patent: June 14, 2022
    Assignee: TDK CORPORATION
    Inventors: Shinto Ichikawa, Katsuyuki Nakada, Tomoyuki Sasaki
  • Patent number: 11355783
    Abstract: A method of manufacturing a lithium-ion secondary battery of the present invention includes at least four steps as follows: an initial charging step of charging the lithium-ion secondary battery, which has not been subjected to initial charging, under a temperature environment ranging of equal to or higher than ?20° C. and equal to or lower than 15° C.; an aging step of leaving the lithium-ion secondary battery under a temperature environment ranging of equal to or higher than 30° C. and equal to or lower than 80° C. after the initial charging step; a short circuit detecting step of detecting the presence or absence of a short circuit of the lithium-ion secondary battery by measuring a voltage drop quantity of the lithium-ion secondary battery and comparing the voltage drop quantity with a reference value; and a sorting step of sorting out a lithium-ion secondary battery in which no short circuit is detected.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: June 7, 2022
    Assignee: ENVISION AESC JAPAN LTD.
    Inventors: Tomoyuki Ichikawa, Shinsuke Enomoto, Naoyuki Iwata
  • Patent number: 11350505
    Abstract: A semiconductor light source includes multiple light-emitting elements coupled in series. A driving circuit receives an input voltage, and supplies a driving current to the semiconductor light source. A bypass circuit is coupled to a part of the multiple light-emitting elements. When a low-voltage state occurs, the bypass circuit is set to the enabled state, thereby bypassing the driving current. An auxiliary power supply circuit is coupled in series with the part of the multiple light-emitting elements. When an expected current does not flow through the auxiliary power supply circuit after the bypass circuit is set to the disabled state, a judgement unit judges that an open-circuit fault has occurred in the part of the multiple light-emitting elements.
    Type: Grant
    Filed: February 11, 2021
    Date of Patent: May 31, 2022
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventor: Tomoyuki Ichikawa
  • Publication number: 20220154905
    Abstract: A light source module is switchable between a high beam and a low beam, and is mounted on a vehicle. A first light source is arranged such that its output light is irradiated to a low-beam region by a first optical system. A second light source is arranged such that its output light is irradiated to a high-beam region by a second optical system. A lighting circuit supplies a driving current to the first light source in response to a turn-on instruction for either the high beam or the low beam. Furthermore, the lighting circuit supplies the output current to the second light source in response to a turn-on instruction for the high beam.
    Type: Application
    Filed: January 31, 2022
    Publication date: May 19, 2022
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Norikazu SAITO, Atsushi OZAWA
  • Publication number: 20220156677
    Abstract: A process management system includes a first acquirer, a second acquirer, and a processing unit. The first acquirer is configured to acquire first time information on an amount of time for which a person is present in a work area. The second acquirer is configured to acquire second time information on an amount of motion time for which the person makes a prescribed motion in the work area. The processing unit acquires, in accordance with the first time information and the second time information, work information on work which the person carries out, the work including the prescribed motion.
    Type: Application
    Filed: December 13, 2019
    Publication date: May 19, 2022
    Inventors: Masataka HAYASHI, Masashi NAKAYAMA, Tomoyuki ICHIKAWA
  • Publication number: 20220090767
    Abstract: A light-emitting module includes: a semiconductor light-emitting element; a circuit board on which a lighting control circuit configured to perform control to turn on and off the semiconductor light-emitting element is provided; and an element metal plate on which the semiconductor light-emitting element is mounted. The circuit board is a resin substrate in which a wiring portion connecting the semiconductor light-emitting element and the lighting control circuit is provided.
    Type: Application
    Filed: September 17, 2021
    Publication date: March 24, 2022
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tetsuya Suzuki, Tomoyuki Ichikawa
  • Publication number: 20220030684
    Abstract: An automotive lamp includes a first semiconductor light source and a second semiconductor light source configured to emit different colors, and to mix the two colors, so as to generate mixed-color light. A first driving circuit supplies a first driving current stabilized to a first target amount to the first semiconductor light source. A second driving circuit supplies a second driving current stabilized to a second target amount to the second semiconductor light source. Upon detecting an abnormal non-lighting state in the first semiconductor light source, the first abnormal state detection circuit stops the operation of the second driving circuit. Upon detecting an abnormal non-lighting state in the second semiconductor light source, the second abnormal state detection circuit stops the operation of the first driving circuit.
    Type: Application
    Filed: October 8, 2021
    Publication date: January 27, 2022
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventor: Tomoyuki ICHIKAWA
  • Publication number: 20220022300
    Abstract: A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.
    Type: Application
    Filed: September 29, 2021
    Publication date: January 20, 2022
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Ryosuke MATSUHANA, Satoshi KIKUCHI, Naoki KAWABATA, Norito TAKAHASHI
  • Publication number: 20220022299
    Abstract: A lighting circuit turns on a plurality of semiconductor light sources. Multiple current sources are each coupled to a corresponding semiconductor light source. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits each formed of the semiconductor light source and the current source. A converter controller employing a ripple control method turns on a switching transistor of the switching converter in response to a voltage across any one of the multiple current sources decreasing to a bottom limit voltage.
    Type: Application
    Filed: September 29, 2021
    Publication date: January 20, 2022
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Ryosuke MATSUHANA, Satoshi KIKUCHI, Naoki KAWABATA, Norito TAKAHASHI
  • Publication number: 20210410248
    Abstract: A semiconductor light source and a constant current circuit are arranged in series between an input terminal and a ground terminal. When an input voltage at the input terminal exceeds a predetermined threshold voltage, a load dump circuit cuts off or reduces a current that flows through the constant current circuit.
    Type: Application
    Filed: September 10, 2021
    Publication date: December 30, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Tetsuya SUZUKI, Atsushi OZAWA, Toru ITO
  • Patent number: 11197356
    Abstract: This lighting circuit comprises a current source and a thermal sensing element. The thermal sensing element senses the temperature of a semiconductor light source. The current source generates a drive current that shows a positive correlation with the temperature when the temperature is in a normal range and that shows a negative correlation with the temperature when the temperature falls within a temperature range higher than the normal range.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: December 7, 2021
    Assignee: KOITO MANUFACIURING CO., LTD.
    Inventors: Tomoyuki Ichikawa, Masato Harazaki
  • Publication number: 20210378070
    Abstract: A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature Tj.
    Type: Application
    Filed: August 16, 2021
    Publication date: December 2, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Satoshi KIKUCHI, Ryosuke MATSUHANA
  • Publication number: 20210376426
    Abstract: In an initial state, a battery is in the following state. A laminate has a thickness T0 from a first electrode to a first electrode. A first position is spaced from the end portion of a separator on the first position side by a distance L0 in a direction perpendicular to a thickness direction of the laminate. The end portion of a separator on the first position side protrudes toward the first position from the end portion of the second electrode on the first position side, by a distance G in the direction perpendicular to the thickness direction of the laminate. The laminate is designed such that, even if the laminate swells in the thickness direction of the laminate, the thickness of the laminate from the first electrode to the first electrode is smaller than 4×{(T0/2)2+L02?(L0?G)2}1/2.
    Type: Application
    Filed: October 19, 2017
    Publication date: December 2, 2021
    Applicant: Envision AESC Energy Devices Ltd.
    Inventor: Tomoyuki ICHIKAWA
  • Patent number: 11046236
    Abstract: The light source of the present disclosure spot-irradiates a distant place in front of a vehicle. The turn on/off circuit supplies a driving current ILD to the light source 120 to turn on the light source. The swivel mechanism swivels the light source. The turn on/off circuit reduces a light quantity of the light source as a swivel angle ? of the swivel mechanism is large.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: June 29, 2021
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventor: Tomoyuki Ichikawa
  • Publication number: 20210168918
    Abstract: A semiconductor light source includes multiple light-emitting elements coupled in series. A driving circuit receives an input voltage, and supplies a driving current to the semiconductor light source. A bypass circuit is coupled to a part of the multiple light-emitting elements. When a low-voltage state occurs, the bypass circuit is set to the enabled state, thereby bypassing the driving current. An auxiliary power supply circuit is coupled in series with the part of the multiple light-emitting elements. When an expected current does not flow through the auxiliary power supply circuit after the bypass circuit is set to the disabled state, a judgement unit judges that an open-circuit fault has occurred in the part of the multiple light-emitting elements.
    Type: Application
    Filed: February 11, 2021
    Publication date: June 3, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventor: Tomoyuki ICHIKAWA
  • Publication number: 20210160989
    Abstract: A driving circuit receives an input voltage, and supplies a driving current to a semiconductor light source. A plurality of m (m?2) bypass switches are coupled in parallel with multiple light-emitting elements, respectively. A bypass control unit generates m-phase gate pulse signals having a duty cycle that corresponds to the input voltage and phases shifted in increments of 360°/m, and controls the m bypass switches according to the m-phase gate pulse signals.
    Type: Application
    Filed: February 5, 2021
    Publication date: May 27, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventor: Tomoyuki ICHIKAWA
  • Publication number: 20210153314
    Abstract: This lighting circuit comprises a current source and a thermal sensing element. The thermal sensing element senses the temperature of a semiconductor light source. The current source generates a drive current that shows a positive correlation with the temperature when the temperature is in a normal range and that shows a negative correlation with the temperature when the temperature falls within a temperature range higher than the normal range.
    Type: Application
    Filed: July 16, 2019
    Publication date: May 20, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Masato HARAZAKI
  • Publication number: 20210144362
    Abstract: A video signal processing device includes: a video signal dividing unit configured to divide a video signal into first to k-th (k is an integer of 2 or greater) partial video signals for each frame; a video change detection unit configured to determine, for each of the first to k-th partial video signals, whether or not a video based on the partial video signals has changed between respective frames, and generate first to k-th video change detection signals representing the respective detection results; and a video sameness determination unit configured to generate a video sameness signal indicating that the video signal has not changed, if the number of video change detection signals that indicate the video has not changed, among the first to k-th video change detection signals, is greater than a prescribed number.
    Type: Application
    Filed: January 19, 2021
    Publication date: May 13, 2021
    Applicant: LAPIS Semiconductor Co., Ltd.
    Inventor: Tomoyuki ICHIKAWA
  • Publication number: 20210016706
    Abstract: A lighting circuit turns on multiple semiconductor light sources. Multiple current sources are each coupled in series with a corresponding one from among the semiconductor light sources. A switching converter supplies a driving voltage VOUT across each of multiple series connection circuits formed of the multiple semiconductor light sources and the multiple current sources. A converter controller controls a switching transistor of the switching converter based on a relation between a voltage across one from among the multiple current sources and a reference voltage having a positive correlation with the temperature Tj.
    Type: Application
    Filed: October 7, 2020
    Publication date: January 21, 2021
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Satoshi KIKUCHI, Ryosuke MATSUHANA
  • Patent number: 10874009
    Abstract: A load driving apparatus receives an input voltage from a power supply, and supplies electric power to a load under processor control. The processor outputs first and second signals via first and second pins in a conjunction such that they are negated when the load is instructed to suspend operation. An output circuit supplies electric power to the load. A protection switch is provided on a driving path that extends from the power supply to the load and returns to the power supply. When the first signal is asserted (negated), a control circuit sets the output circuit to an operation state (suspension state). The control circuit turns on the protection switch on assertion of the second signal, and turns it off on negation of this signal.
    Type: Grant
    Filed: December 2, 2018
    Date of Patent: December 22, 2020
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki Ichikawa, Toshiaki Tsuda