Patents by Inventor Takaaki HIRASAWA

Takaaki HIRASAWA 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).

  • Power supply controlling apparatus and image forming apparatus
    Patent number: 11025793
    Abstract: A power supply controlling apparatus includes a first power supply unit that supplies DC power to a load using power supplied from a commercial power supply, a power detecting unit that detects an input voltage and an input current input from the commercial power supply to the first power supply unit, and a control unit that controls the input current to be a constant current having an upper limit current value in response to the input voltage by controlling DC power supplied to the load from the first power supply unit based on the input voltage and the input current which are detected by the power detecting unit.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: June 1, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Junpei Hosoya, Tomoyuki Yamashita, Norikazu Okada, Takaaki Hirasawa, Shunta Yamahori
  • POWER SUPPLY CONTROLLING APPARATUS AND IMAGE FORMING APPARATUS
    Publication number: 20200244832
    Abstract: A power supply controlling apparatus includes a first power supply unit that supplies DC power to a load using power supplied from a commercial power supply, a power detecting unit that detects an input voltage and an input current input from the commercial power supply to the first power supply unit, and a control unit that controls the input current to be a constant current having an upper limit current value in response to the input voltage by controlling DC power supplied to the load from the first power supply unit based on the input voltage and the input current which are detected by the power detecting unit.
    Type: Application
    Filed: January 24, 2020
    Publication date: July 30, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Junpei HOSOYA, Tomoyuki YAMASHITA, Norikazu OKADA, Takaaki HIRASAWA, Shunta YAMAHORI