Patents by Inventor Nozomi FUJISHIGE

Nozomi FUJISHIGE 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).

  • Optical path shifting device, image display device, and method for controlling optical path shifting device
    Patent number: 11537032
    Abstract: An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: December 27, 2022
    Assignee: Seiko Epson Corporation
    Inventors: Shinichi Wakabayashi, Akira Nemura, Takao Hirakura, Daisuke Yanagihara, Nozomi Fujishige, Kazunori Maeta
  • OPTICAL PATH SHIFTING DEVICE, IMAGE DISPLAY DEVICE, AND METHOD FOR CONTROLLING OPTICAL PATH SHIFTING DEVICE
    Publication number: 20200159093
    Abstract: An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.
    Type: Application
    Filed: November 14, 2019
    Publication date: May 21, 2020
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Shinichi WAKABAYASHI, Akira NEMURA, Takao HIRAKURA, Daisuke YANAGIHARA, Nozomi FUJISHIGE, Kazunori MAETA