Patents by Inventor Kimio Nagasaka

Kimio Nagasaka 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).

  • Patent number: 11002808
    Abstract: A gas cell includes a cell having a principal chamber having a coating material film formed on an inside wall, a reservoir arranged with the principal chamber along the longitudinal direction and communicating with to the principal chamber, a reinforcement section extending from the reservoir side of the principal chamber in an X-axis direction along the reservoir, an opening section disposed on an opposite side of the reservoir to the principal chamber, and a sealing section adapted to block the opening section, and an alkali metal gas encapsulated in the principal chamber, and the reinforcement section is provided with one of at least one hole and at least one groove.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: May 11, 2021
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Eiichi Fujii, Kimio Nagasaka
  • Patent number: 11005487
    Abstract: An atomic oscillator includes an atom cell that includes walls defining an internal space in which alkali metal atoms are contained, a light emitting element that emits light for exciting the alkali metal atoms, and a light detecting element that detects the light transmitted through the atom cell, in which the atom cell includes a first portion in which gaseous alkali metal atoms are contained and through which light from the light emitting element passes along an x-axis, a second portion in which liquid or solid alkali metal atoms are contained, and a third portion that is positioned between the first portion and the second portion and couples the first portion and the second portion, and in the third portion, a distance between two walls facing each other along a y-axis orthogonal to the x-axis decreases from the first portion toward the second portion along the y-axis at a constant decrease rate.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: May 11, 2021
    Inventors: Yukihiro Hashi, Kimio Nagasaka, Yoshiyuki Maki, Takemi Yonezawa
  • Publication number: 20210063970
    Abstract: A quantum interference device includes a light emitting element; and an atomic cell on which light from the light emitting element is incident. The atomic cell accommodates alkali metal atoms therein, and a coating film containing a polydiyne compound or a polydiene compound is disposed on an inner wall of the atomic cell.
    Type: Application
    Filed: August 27, 2020
    Publication date: March 4, 2021
    Inventor: Kimio NAGASAKA
  • Patent number: 10826510
    Abstract: An atomic oscillator includes: a light-emitting element; an atom cell that includes a first surface on which light beams from the light-emitting element are incident and a second surface from which the light beams incident on the first surface are emitted and accommodates alkali metal atoms in a gas state; a shield that accommodates the atom cell and has a magnetic shielding property, the shield having an opening; a heat transfer member that is in contact with a portion of the atom cell via an opening of the shield and has a thermal conductivity higher than a thermal conductivity of the atom cell; a temperature control element that is in contact with the heat transfer member and controls a temperature of the atom cell; and a light-receiving element that receives the light beams emitted from the second surface.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: November 3, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Kimio Nagasaka, Yukihiro Hashi, Takahiro Kan, Tomohiro Tamura, Teppei Higuchi
  • Publication number: 20200313683
    Abstract: An atomic oscillator includes an atom cell that includes walls defining an internal space in which alkali metal atoms are contained, a light emitting element that emits light for exciting the alkali metal atoms, and a light detecting element that detects the light transmitted through the atom cell, in which the atom cell includes a first portion in which gaseous alkali metal atoms are contained and through which light from the light emitting element passes along an x-axis, a second portion in which liquid or solid alkali metal atoms are contained, and a third portion that is positioned between the first portion and the second portion and couples the first portion and the second portion, and in the third portion, a distance between two walls facing each other along a y-axis orthogonal to the x-axis decreases from the first portion toward the second portion along the y-axis at a constant decrease rate.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Inventors: Yukihiro HASHI, Kimio NAGASAKA, Yoshiyuki MAKI, Takemi YONEZAWA
  • Patent number: 10739416
    Abstract: A gas cell includes a cell main body having a first chamber defined by an inner wall, and a first paraffin film provided on the inner wall, wherein in the first chamber, a gas which interacts with an electromagnetic wave is stored, the first paraffin film is a pure paraffin film, and a paraffin constituting the first paraffin film is arranged such that the directions of the molecular axes are aligned.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: August 11, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kimio Nagasaka, Eiichi Fujii, Yasushi Tsuchiya
  • Patent number: 10725127
    Abstract: In a magnetic field measurement apparatus, a light source irradiates a gas cell with linearly polarized light serving as pump light and probe light in a Z axis direction, and a magnetic field generator applies, to the gas cell, a magnetic field Ax which is a time function f(t) having the amplitude A0 taking n fixed values fi (where i=1, . . . , and n), and a magnetic field Ay which is a time function g(t) having the amplitude A0 taking m fixed values gj (where j=1, . . . , and m) in each of X axis and Y axis directions. A calculation controller calculates a magnetic field C (Cx, Cy, Cz) of a measurement region using the X axis and Y axis components Ax and Ay of an artificial magnetic field A, and a spin polarization degree Mx corresponding to a measurement value W? from a magnetic sensor.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: July 28, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kimio Nagasaka, Mitsutoshi Miyasaka
  • Publication number: 20200212919
    Abstract: An atomic oscillator includes: a light-emitting element; an atom cell that includes a first surface on which light beams from the light-emitting element are incident and a second surface from which the light beams incident on the first surface are emitted and accommodates alkali metal atoms in a gas state; a shield that accommodates the atom cell and has a magnetic shielding property, the shield having an opening; a heat transfer member that is in contact with a portion of the atom cell via an opening of the shield and has a thermal conductivity higher than a thermal conductivity of the atom cell; a temperature control element that is in contact with the heat transfer member and controls a temperature of the atom cell; and a light-receiving element that receives the light beams emitted from the second surface.
    Type: Application
    Filed: December 27, 2019
    Publication date: July 2, 2020
    Inventors: Kimio NAGASAKA, Yukihiro HASHI, Takahiro KAN, Tomohiro TAMURA, Teppei HIGUCHI
  • Publication number: 20190154769
    Abstract: In a magnetic field measurement apparatus, a light source irradiates a gas cell with linearly polarized light serving as pump light and probe light in a Z axis direction, and a magnetic field generator applies, to the gas cell, a magnetic field Ax which is a time function f(t) having the amplitude A0 taking n fixed values fi (where i=1, . . . , and n), and a magnetic field Ay which is a time function g(t) having the amplitude A0 taking m fixed values gj (where j=1, . . . , and m) in each of X axis and Y axis directions. A calculation controller calculates a magnetic field C (Cx, Cy, Cz) of a measurement region using the X axis and Y axis components Ax and Ay of an artificial magnetic field A, and a spin polarization degree Mx corresponding to a measurement value W? from a magnetic sensor.
    Type: Application
    Filed: January 29, 2019
    Publication date: May 23, 2019
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Kimio NAGASAKA, Mitsutoshi MIYASAKA
  • Patent number: 10254356
    Abstract: In a magnetic field measurement apparatus, a light source irradiates a gas cell with linearly polarized light serving as pump light and probe light in a Z axis direction, and a magnetic field generator applies, to the gas cell, a magnetic field Ax which is a time function f(t) having the amplitude A0 taking n fixed values fi (where i=1, . . . , and n), and a magnetic field Ay which is a time function g(t) having the amplitude A0 taking m fixed values gj (where j=1, . . . , and m) in each of X axis and Y axis directions. A calculation controller calculates a magnetic field C (Cx, Cy, Cz) of a measurement region using the X axis and Y axis components Ax and Ay of an artificial magnetic field A, and a spin polarization degree Mx corresponding to a measurement value W? from a magnetic sensor.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: April 9, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kimio Nagasaka, Mitsutoshi Miyasaka
  • Patent number: 10234517
    Abstract: A magnetism measuring device includes: a wall forming a cell portion; an opening which is open to a portion of the wall; a sealing material which seals the opening; a coating layer which covers the sealing material on an inside of the cell portion; and an alkali metal gas which is sealed in the cell portion.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: March 19, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Eiichi Fujii, Kimio Nagasaka
  • Patent number: 10168394
    Abstract: A method for manufacturing a magnetism measurement device which measures a magnetic field generated from a living body, includes: arranging an ampoule made of borosilicate glass and having a hollow part filled with a solid alkali metal, in a void in a cell section made of quartz glass, and then sealing the cell section; and casting a pulse laser beam on the ampoule through the cell section and thus forming a penetration hole in the ampoule. The pulse laser beam has an energy of 20 ?J/pulse to 200 ?J/pulse. The absorption coefficient of quarts glass for the pulse laser beam is lower than the absorption coefficient of borosilicate glass for the pulse laser beam.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: January 1, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Eiichi Fujii, Kimio Nagasaka
  • Patent number: 10145905
    Abstract: A gas cell sealing method includes bonding step in which a bonding portion of a gas cell main body having an opening and a lid for closing the opening where a sealant for bonding the gas cell main body and the lid is provided is heated by converging a laser beam from a laser light source through an optical element, and the lid is bonded to the gas cell main body by applying pressure in a direction that presses the lid against the gas cell main body, the pressure being applied while the laser beam is being converged to the bonding portion.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: December 4, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Eiichi Fujii, Kimio Nagasaka
  • Patent number: 10107876
    Abstract: A magnetism measurement apparatus that measures a magnetic field includes a gas cell including a primary chamber, a reservoir, and a exhaust hole that allows the primary chamber and the reservoir to communicate with each other. The primary chamber and the reservoir are filled with an alkali metal gas, and at least one of an alkali metal solid and an alkali metal liquid is placed in the reservoir.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: October 23, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Eiichi Fujii, Kimio Nagasaka, Mitsutoshi Miyasaka
  • Patent number: 10024931
    Abstract: In a magnetic field measurement apparatus, a light source irradiates a gas cell with linearly polarized light serving as pump light and probe light in a Z axis direction, and a magnetic field generator applies alternating magnetic fields which have the same cycle and different phases to the gas cell in each of X axis and Y axis directions. A calculation controller calculates a magnetic field C (Cx, Cy, Cz) of a measurement region using X axis and Y axis components Ax and Ay of the alternating magnetic fields, and a spin polarization degree Mx corresponding to a measurement value W? from a magnetic sensor.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: July 17, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kimio Nagasaka, Mitsutoshi Miyasaka, Satoshi Takahashi
  • Publication number: 20180143265
    Abstract: A gas cell includes a cell main body having a first chamber defined by an inner wall, and a first paraffin film provided on the inner wall, wherein in the first chamber, a gas which interacts with an electromagnetic wave is stored, the first paraffin film is a pure paraffin film, and a paraffin constituting the first paraffin film is arranged such that the directions of the molecular axes are aligned.
    Type: Application
    Filed: November 13, 2017
    Publication date: May 24, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Kimio NAGASAKA, Eiichi FUJII, Yasushi TSUCHIYA
  • Publication number: 20180128886
    Abstract: A magnetic sensor includes a light flux emitting unit, a first cell onto which a light flux, which propagates in a first direction, is incident and that accommodates a medium which changes optical characteristics of the light flux depending on a magnitude of a magnetic field, a first light flux bender that bends some of the plurality of light fluxes in a second direction different from the first direction, a second cell onto which the light flux, which is bent in the second direction in the first light flux bender, is incident and that accommodates a medium which changes optical characteristics of the light flux depending on the magnitude of the magnetic field, a first light detection element that detects optical characteristics of the light flux emitted from the first cell, and a second light detection element that detects optical characteristics of the light flux emitted from the second cell.
    Type: Application
    Filed: October 27, 2017
    Publication date: May 10, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Kimio NAGASAKA
  • Patent number: 9964604
    Abstract: A light source unit irradiates a gas cell disposed in a measurement region with linearly polarized light in which the direction of travel is a z-axis direction and the vibration direction of an electric field is a y-axis direction. A polarimeter detects optical characteristics of light passing through the gas cell. A magnetic field generator applies an artificial magnetic field, capable of varying an x-axis component, a y-axis component, and a z-axis component, to the measurement region. A calculation control unit generates a plurality of artificial magnetic fields, calculates a magnetization value or a value corresponding to the magnetization value on the basis of the detection results of the polarimeter, and calculates an original magnetic field present in the measurement region, using an artificial magnetic field when the magnetization value or the value corresponding to the magnetization value satisfies a condition for external value.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: May 8, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Kimio Nagasaka
  • Publication number: 20180059194
    Abstract: A gas cell includes a cell having a principal chamber having a coating material film formed on an inside wall, a reservoir arranged with the principal chamber along the longitudinal direction and communicating with to the principal chamber, a reinforcement section extending from the reservoir side of the principal chamber in an X-axis direction along the reservoir, an opening section disposed on an opposite side of the reservoir to the principal chamber, and a sealing section adapted to block the opening section, and an alkali metal gas encapsulated in the principal chamber, and the reinforcement section is provided with one of at least one hole and at least one groove.
    Type: Application
    Filed: August 25, 2017
    Publication date: March 1, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Eiichi FUJII, Kimio NAGASAKA
  • Publication number: 20170299662
    Abstract: A magnetic field measurement apparatus includes a plurality of magnetic sensors, a calibration unit that estimates a magnetic field on the basis of detected vectors of the magnetic sensors, positional information of the magnetic sensors, and measured values of the magnetic sensors, and updates the detected vectors on the basis of the estimated magnetic field, and a magnetic field calculation unit that calculates a magnetic field to be measured on the basis of the measured values of the magnetic sensors and the detected vectors updated by the calibration unit.
    Type: Application
    Filed: April 4, 2017
    Publication date: October 19, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Kimio NAGASAKA