Patents by Inventor Ryosuke MATSUHANA

Ryosuke MATSUHANA 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: 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: 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: 20210233404
    Abstract: In an automatic parking system, a marker recognizing unit performs recognition of a predetermined number of markers located respectively at predetermined locations in a parking garage. A marker deter miner performs determination of whether there is a problem in recognition of at least one marker in the predetermined number of markers in accordance with information resulting from the recognition performed by the marker detector. An output unit outputs marker state information resulting from the determination performed by the marker determiner.
    Type: Application
    Filed: January 25, 2021
    Publication date: July 29, 2021
    Inventors: Ryosuke MATSUHANA, Yosuke HATTORI
  • 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
  • Publication number: 20200275542
    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: May 14, 2020
    Publication date: August 27, 2020
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Tomoyuki ICHIKAWA, Ryosuke MATSUHANA, Satoshi KIKUCHI, Naoki KAWABATA, Norito TAKAHASHI