Patents by Inventor Shumpei Koshima

Shumpei Koshima 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).

  • Light emitting element driving device for preventing that overcurrent flows through light emitting element
    Patent number: 11706855
    Abstract: A light emitting element driving device includes a light emitting element to emit light in response to a supply of a first current, a first switching element to turn ON/OFF the first current supplied to the light emitting element, a second switching element to turn ON/OFF a second current not supplied to the light emitting element, a constant current circuit to adjust a total current amount of the first current and the second current to be constant, and a control circuit. The control circuit turns ON the first switching element in a state of flowing the second current to the second switching element by turning ON the second switching element, and after turning ON the first switching element, flows the first current to the light emitting element and the first switching element by turning OFF the second switching element.
    Type: Grant
    Filed: June 13, 2022
    Date of Patent: July 18, 2023
    Assignee: PFU LIMITED
    Inventors: Shumpei Koshima, Masaaki Sakai
  • LIGHT EMITTING ELEMENT DRIVING DEVICE FOR PREVENTING THAT OVERCURRENT FLOWS THROUGH LIGHT EMITTING ELEMENT
    Publication number: 20230020031
    Abstract: A light emitting element driving device includes a light emitting element to emit light in response to a supply of a first current, a first switching element to turn ON/OFF the first current supplied to the light emitting element, a second switching element to turn ON/OFF a second current not supplied to the light emitting element, a constant current circuit to adjust a total current amount of the first current and the second current to be constant, and a control circuit. The control circuit turns ON the first switching element in a state of flowing the second current to the second switching element by turning ON the second switching element, and after turning ON the first switching element, flows the first current to the light emitting element and the first switching element by turning OFF the second switching element.
    Type: Application
    Filed: June 13, 2022
    Publication date: January 19, 2023
    Inventors: Shumpei Koshima, Masaaki Sakai