Patents by Inventor Taroh Shirai

Taroh Shirai 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).

  • Illumination light and illumination device
    Patent number: 9572213
    Abstract: An illumination light includes: a bridge diode that performs full-wave rectification on an alternating-current signal; a switching converter that includes a switching device and that converts the alternating-current signal on which the full-wave rectification has been performed, into a direct-current signal; a controller that controls on/off timing of the switching device; and a semiconductor light emitting element that is connected to the switching converter and the controller and to which the direct-current signal is output.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: February 14, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Ryohsuke Nishi, Taroh Shirai, Norihiro Yamamoto
  • ILLUMINATION LIGHT AND ILLUMINATION DEVICE
    Publication number: 20160066376
    Abstract: An illumination light includes: a bridge diode that performs full-wave rectification on an alternating-current signal; a switching converter that includes a switching device and that converts the alternating-current signal on which the full-wave rectification has been performed, into a direct-current signal; a controller that controls on/off timing of the switching device; and a semiconductor light emitting element that is connected to the switching converter and the controller and to which the direct-current signal is output.
    Type: Application
    Filed: August 26, 2015
    Publication date: March 3, 2016
    Applicant: RICOH COMPANY, LTD.
    Inventors: Ryohsuke Nishi, Taroh Shirai, Norihiro Yamamoto