Patents by Inventor Nobuo OOBA

Nobuo OOBA 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).

  • Variable focal length lens apparatus and control method
    Patent number: 11215739
    Abstract: A variable focal length lens apparatus includes a liquid lens apparatus in which the refractive index changes in accordance with an input drive signal, and a refractive power controller that controls refractive power of the lens system. The refractive power controller adjusts the voltage of the drive signal in accordance with effective power that is supplied to the liquid lens apparatus.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: January 4, 2022
    Assignee: MITUTOYO CORPORATION
    Inventors: Shiro Igasaki, Nobuo Ooba, Masaki Okayasu, Yuki Kurahashi
  • Variable focal length lens apparatus and control method
    Patent number: 11022727
    Abstract: A variable focal length lens apparatus includes a liquid lens apparatus in which the refractive index changes in accordance with an input drive signal, and a drive controller that outputs the drive signal to the liquid lens apparatus. The drive controller includes a resonance lock controller that changes a frequency of the drive signal by tracking the drive signal to a resonance frequency of the liquid lens apparatus, and a tracking delayer that delays a change in the frequency of the drive signal that is due to the resonance lock controller.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: June 1, 2021
    Assignee: MITUTOYO CORPORATION
    Inventors: Shiro Igasaki, Nobuo Ooba
  • VARIABLE FOCAL LENGTH LENS APPARATUS AND CONTROL METHOD
    Publication number: 20200073024
    Abstract: A variable focal length lens apparatus includes a liquid lens apparatus in which the refractive index changes in accordance with an input drive signal, and a drive controller that outputs the drive signal to the liquid lens apparatus. The drive controller includes a resonance lock controller that changes a frequency of the drive signal by tracking the drive signal to a resonance frequency of the liquid lens apparatus, and a tracking delayer that delays a change in the frequency of the drive signal that is due to the resonance lock controller.
    Type: Application
    Filed: August 23, 2019
    Publication date: March 5, 2020
    Applicant: MITUTOYO CORPORATION
    Inventors: Shiro IGASAKI, Nobuo OOBA
  • VARIABLE FOCAL LENGTH LENS APPARATUS AND CONTROL METHOD
    Publication number: 20200073025
    Abstract: A variable focal length lens apparatus includes a liquid lens apparatus in which the refractive index changes in accordance with an input drive signal, and a refractive power controller that controls refractive power of the lens system. The refractive power controller adjusts the voltage of the drive signal in accordance with effective power that is supplied to the liquid lens apparatus.
    Type: Application
    Filed: August 30, 2019
    Publication date: March 5, 2020
    Applicant: MITUTOYO CORPORATION
    Inventors: Shiro IGASAKI, Nobuo OOBA, Masaki OKAYASU, Yuki KURAHASHI