Patents by Inventor Mikio KOZUMA

Mikio KOZUMA 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).

  • Publication number: 20230030335
    Abstract: To provide a light source device for a fiber optic gyroscope capable of broadening the bandwidth of the laser light and improving stability of a scale factor. A light source device for a fiber optic gyroscope configured to drive a fiber optic gyroscope includes: a laser light source 10, a stabilizing part 20, and a bandwidth broadening part 30. The laser light source 10 emits a laser light of a predetermined frequency. The stabilizing part 20 stabilizes the predetermined frequency of the laser light emitted from the laser light source 10. The bandwidth broadening part 30 makes the laser light stabilized by the stabilizing part 20 into a light having a continuous broadband spectrum.
    Type: Application
    Filed: November 19, 2020
    Publication date: February 2, 2023
    Inventor: Mikio KOZUMA
  • Publication number: 20230011067
    Abstract: An atomic interferometer includes: an optical system including an optical modulating device that includes: an optical fiber for a first laser beam to propagate therein; and a frequency shifter connected to the optical fiber and configured to shift the frequency of the first laser beam, the optical system being configured to generate a moving standing light wave from counter-propagation of the first laser beam from the optical modulating device and a second laser beam; and an interference system for making an atomic beam interact with three or more moving standing light waves including the moving standing light wave.
    Type: Application
    Filed: September 24, 2020
    Publication date: January 12, 2023
    Applicants: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Ryotaro INOUE, Mikio KOZUMA, Atsushi TANAKA
  • Patent number: 11466987
    Abstract: The present invention reduces measurement time. A gyroscope of the present invention includes a planar ion trap part, a microwave irradiation part, a laser irradiation part and a measurement part. The planar ion trap part includes two rf electrodes and two DC electrode rows, and forms ion traps that trap one ion on a substrate, a normal direction of the surface of the planar ion trap part corresponds to a z direction. The rf electrodes are disposed in the x direction on the substrate at a predetermined interval. The DC electrode rows are disposed in the x direction on the substrate so as to sandwich the two rf electrodes. The DC electrode rows each include at least five DC electrodes in the x direction. The trapped ions are spaced so as not to interfere with each other. The microwave irradiation part irradiates the ions with ?/2 microwave pulses.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: October 11, 2022
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, OSAKA UNIVERSITY, JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Mikio Kozuma, Ryotaro Inoue, Takashi Mukaiyama, Utako Tanaka, Seiichi Morimoto, Kazunori Yoshioka, Atsushi Tanaka, Yuichiro Kamino
  • Publication number: 20220290988
    Abstract: A geoid calculation data is collected easily. A geoid calculation data collection device of the present invention comprises an inertial measurement data acquisition part, a comparison data acquisition part, and a recording part. In the inertial measurement data acquisition part, data related to velocity, position, and attitude angle is acquired as inertially-derived data based on an output of an inertial measurement part having a three-axis gyro and a three-axis accelerometer attached to a moving body. In the comparison data acquisition part, data related to velocity is acquired as comparison data from a source other than the inertial measurement part. In the recording part, inertially-derived data and comparison data are recorded in association with each other. In the inertial measurement part, a bias stability is acquired that allows error arising from plumb line deviation to be distinguished to a predetermined degree.
    Type: Application
    Filed: May 27, 2022
    Publication date: September 15, 2022
    Applicants: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Toshiyuki HOSOYA, Atsushi TANAKA
  • Patent number: 11378397
    Abstract: A change in geoid height is measured easily. A geoid measurement method of the present invention executes an inertial measurement data acquiring step, a comparison data acquiring step, a state variable estimating step, and a geoid calculating step. In the inertial measurement data acquiring step, data related to velocity, position, and attitude angle is acquired as inertially-derived data based on the output of an inertial measurement part having a three-axis gyro and a three-axis accelerometer attached to a moving body. In the comparison data acquiring step, data related to velocity is acquired as comparison data from a source other than the inertial measurement part. In the state variable estimating step, state variables including a plumb line deviation are estimated by using the inertially-derived data and the comparison data to apply a Kalman filter in which the plumb line deviation is included in the state variables.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: July 5, 2022
    Assignees: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Mikio Kozuma, Ryotaro Inoue, Toshiyuki Hosoya, Atsushi Tanaka
  • Publication number: 20210389114
    Abstract: An atomic beam is irradiated with a first laser beam, a second laser beam, and a third laser beam. The first laser beam and the third laser beam each have a wavelength corresponding to a transition between a ground state and a first excited state. The second laser beam has a wavelength corresponding to a transition between the ground state and a second excited state. First, atoms each having a smaller velocity component than a predetermined velocity in a direction orthogonal to the traveling direction of the atomic beam are changed from the ground state to the first excited state by the first laser beam. Subsequently, a momentum is provided for individual atoms in the ground state by the second laser beam, which removes the atoms from the atomic beam. Finally, atoms in the first excited state are returned from the first excited state to the ground state by the third laser beam.
    Type: Application
    Filed: October 9, 2019
    Publication date: December 16, 2021
    Applicants: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Toshiyuki HOSOYA, Atsushi TANAKA
  • Publication number: 20210233676
    Abstract: Provided is a cold atomic beam generation technology that causes a cold atomic beam to travel in a direction different from the traveling direction of a pushing laser beam. The pushing laser beam is used to generate a cold atomic beam from atoms trapped in a space. Next, the cold atomic beam is deflected by using a zero magnetic field line of a quadrupole magnetic field in a two-dimensional magneto-optical trap mechanism or by using a drift direction of a standing light wave in a moving molasses mechanism.
    Type: Application
    Filed: June 6, 2019
    Publication date: July 29, 2021
    Applicants: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Ryotaro INOUE, Mikio KOZUMA, Atsushi TANAKA
  • Publication number: 20210199435
    Abstract: A change in geoid height is measured easily. A geoid measurement method of the present invention executes an inertial measurement data acquiring step, a comparison data acquiring step, a state variable estimating step, and a geoid calculating step. In the inertial measurement data acquiring step, data related to velocity, position, and attitude angle is acquired as inertially-derived data based on the output of an inertial measurement part having a three-axis gyro and a three-axis accelerometer attached to a moving body. In the comparison data acquiring step, data related to velocity is acquired as comparison data from a source other than the inertial measurement part. In the state variable estimating step, state variables including a plumb line deviation are estimated by using the inertially-derived data and the comparison data to apply a Kalman filter in which the plumb line deviation is included in the state variables.
    Type: Application
    Filed: June 4, 2019
    Publication date: July 1, 2021
    Applicants: JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Toshiyuki HOSOYA, Atsushi TANAKA
  • Publication number: 20200333139
    Abstract: A gyroscope of the present invention includes a moving standing light wave generator to generate three moving standing light waves, an atomic beam source to continuously generate an atomic beam in which individual atoms are in the same state, an interference device that exerts a Sagnac effect through interaction between the atomic beam and the three moving standing light waves and a monitor to detect angular velocity or acceleration by monitoring an atomic beam from the interference device. The atoms are alkaline earth metal atoms, alkaline earth-like metal atoms, stable isotopes of alkaline earth metal atoms or stable isotopes of alkaline earth-like metal atoms.
    Type: Application
    Filed: July 25, 2018
    Publication date: October 22, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, OSAKA UNIVERSITY, JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Takashi MUKAIYAMA, Seiichi MORIMOTO, Kazunori YOSHIOKA, Atsushi TANAKA, Yuichiro KAMINO
  • Publication number: 20200318968
    Abstract: A gyroscope of the present invention includes a moving standing light wave generator to generate three moving standing light waves, an atomic beam source to continuously generate an atomic beam in which individual atoms are in the same state, an interference device that exerts a Sagnac effect through interaction between the atomic beam and the three moving standing light waves, and a monitor to detect angular velocity or acceleration by monitoring an atomic beam from the interference device. Each moving standing light wave satisfies an n-th order Bragg condition, where n is a positive integer of 2 or more.
    Type: Application
    Filed: July 25, 2018
    Publication date: October 8, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, OSAKA UNIVERSITY, JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Takashi MUKAIYAMA, Seiichi MORIMOTO, Kazunori YOSHIOKA, Atsushi TANAKA, Yuichiro KAMINO
  • Publication number: 20200300630
    Abstract: The present invention reduces measurement time. A gyroscope of the present invention includes a planar ion trap part, a microwave irradiation part, a laser irradiation part and a measurement part. The planar ion trap part includes two rf electrodes and two DC electrode rows, and forms ion traps that trap one ion on a substrate, a normal direction of the surface of the planar ion trap part corresponds to a z direction. The rf electrodes are disposed in the x direction on the substrate at a predetermined interval. The DC electrode rows are disposed in the x direction on the substrate so as to sandwich the two rf electrodes. The DC electrode rows each include at least five DC electrodes in the x direction. The trapped ions are spaced so as not to interfere with each other. The microwave irradiation part irradiates the ions with ?/2 microwave pulses.
    Type: Application
    Filed: July 25, 2018
    Publication date: September 24, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, OSAKA UNIVERSITY, JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Takashi MUKAIYAMA, Utako TANAKA, Seiichi MORIMOTO, Kazunori YOSHIOKA, Atsushi TANAKA, Yuichiro KAMINO
  • Publication number: 20200256677
    Abstract: A gyroscope includes an atomic beam source to generate an atomic beam in which individual atoms are in the same state, a moving standing light wave generator to generate M moving standing light waves, an interference device to obtain an atomic beam resulting from the interaction between the atomic beam and the M moving standing light waves, a monitor to detect angular velocity by monitoring the atomic beam from the interference device and an accelerometer. The accelerometer acquires information on acceleration applied to the gyroscope and the moving standing light wave generator adjusts the drift velocity of at least M?1 moving standing light waves among the M moving standing light waves in response to the acceleration information.
    Type: Application
    Filed: July 25, 2018
    Publication date: August 13, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, OSAKA UNIVERSITY, JAPAN AVIATION ELECTRONICS INDUSTRY, LIMITED, MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Mikio KOZUMA, Ryotaro INOUE, Takashi MUKAIYAMA, Seiichi MORIMOTO, Kazunori YOSHIOKA, Atsushi TANAKA, Yuichiro KAMINO