Patents by Inventor Takumi Kawamata

Takumi Kawamata 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).

  • Method for calculating position or angle of inspection target, storage medium, apparatus, and system
    Patent number: 11835370
    Abstract: A method for calculating a position or an angle of an inspection target based on a sine wave signal and a cosine wave signal output from an encoder or a laser interferometer, includes acquiring a temporary movement speed of the inspection target, calculating an amplitude correction value corresponding to the temporary movement speed using information representing a relationship between a movement speed of the inspection target and amplitudes of the sine wave signal and the cosine wave signal acquired in advance, correcting the amplitudes of the sine wave signal and the cosine wave signal using the amplitude correction value, and calculating an offset error in a Lissajous waveform using the sine wave signal and the cosine wave signal the amplitudes of which are corrected with the amplitude correction value and calculating the position or the angle of the inspection target using the offset error.
    Type: Grant
    Filed: January 14, 2022
    Date of Patent: December 5, 2023
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoshi Kubo, Takumi Kawamata
  • METHOD FOR CALCULATING POSITION OR ANGLE OF INSPECTION TARGET, STORAGE MEDIUM, APPARATUS, AND SYSTEM
    Publication number: 20220228889
    Abstract: A method for calculating a position or an angle of an inspection target based on a sine wave signal and a cosine wave signal output from an encoder or a laser interferometer, includes acquiring a temporary movement speed of the inspection target, calculating an amplitude correction value corresponding to the temporary movement speed using information representing a relationship between a movement speed of the inspection target and amplitudes of the sine wave signal and the cosine wave signal acquired in advance, correcting the amplitudes of the sine wave signal and the cosine wave signal using the amplitude correction value, and calculating an offset error in a Lissajous waveform using the sine wave signal and the cosine wave signal the amplitudes of which are corrected with the amplitude correction value and calculating the position or the angle of the inspection target using the offset error.
    Type: Application
    Filed: January 14, 2022
    Publication date: July 21, 2022
    Inventors: Satoshi Kubo, Takumi Kawamata