Patents by Inventor Takemi Yonezawa

Takemi Yonezawa 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: 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: 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: 10566979
    Abstract: An oscillator includes an oscillation source, multiple temperature control elements, and a controller adapted to perform control to suppress an increase in current consumed in one or more of the temperature control elements during at least part of a period from when operation of the oscillation source initiates to when the oscillation source reaches a specified temperature.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: February 18, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kensaku Isohata, Takayuki Kikuchi, Takemi Yonezawa
  • Patent number: 10305488
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency set by the frequency control data by using a resonator, and a processor that is configured to perform a signal process on input frequency control data to output frequency control data. The processor is configured to obtain a pre-estimated value x^?(k) at a time step k by adding a post-estimated value x^(k?1) and a correction value D(k?1) at a time step k?1 together during a process of updating a pre-estimated value in a Kalman filter process, and perform aging correction on the frequency control data on the basis of a result of the Kalman filter process.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: May 28, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10305489
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency, the oscillation frequency being a frequency set by using frequency control data, and a processor that is configured to perform a signal process on input frequency control data, and. The processor is configured to acquire the frequency control data from which an environmental change component is removed of the environmental change component and an aging change component by using environmental change component information, and perform aging correction on the basis of the frequency control data from which the environmental change component is removed.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: May 28, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10298175
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency using a resonator, the oscillation frequency being a frequency set by using frequency control data, and a processor configured to perform a signal process on input frequency control data based on a phase comparison result between an input signal based on the oscillation signal and a reference signal. The processor is configured to estimate a true value for an observed value of the frequency control data based on the phase comparison result through a Kalman filter process in a period before a hold-over state is detected, and generate aging-corrected frequency control data, in a case where the hold-over state is detected, by holding the true value at a timing corresponding to a timing of detecting the hold-over state, and by performing a calculation based on the true value.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: May 21, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10291234
    Abstract: A circuit device includes a processor adapted to perform a signal processing of temperature compensation of an oscillation frequency based on temperature detection data from an external temperature sensor disposed outside the circuit device to output frequency control data, and an oscillation signal generation circuit adapted to generate an oscillation signal with the oscillation frequency corresponding to the frequency control data using the frequency control data and a resonator disposed in a thermostatic oven.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 14, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10177770
    Abstract: A circuit device includes a digital interface, a processor, an oscillation signal generation circuit, a clock signal generation circuit that generates a clock signal having frequency obtained through multiplication of a frequency of the oscillation signal, and terminal groups of the digital interface and the clock signal generation circuit. The terminal group of the digital interface is disposed in a first region along a first side of the circuit device, and the terminal group of the clock signal generation circuit is disposed in any one of second, third and fourth regions of the circuit device.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: January 8, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10084462
    Abstract: A circuit device includes an oscillation signal generation circuit, a reference signal input terminal to which a reference signal is input, and an internal phase comparator that performs phase comparison between an input signal based on the oscillation signal and the reference signal. The oscillation signal generation circuit generates the oscillation signal using the frequency control data based on a result of the phase comparison from an external phase comparator which performs phase comparison between an input signal based on the oscillation signal and the reference signal in a first mode, and generates the oscillation signal using the frequency control data based on a result of the phase comparison from the internal phase comparator in a second mode.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: September 25, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Takemi Yonezawa
  • Patent number: 10067156
    Abstract: A physical quantity sensor includes a physical quantity sensor element and an IC connected to the physical quantity sensor element. The IC includes an analog power supply circuit that is switched to enable or disable, a signal processing unit to which a voltage is supplied from the analog power supply circuit and which processes a signal from the physical quantity sensor element, and a control circuit that sets the analog power supply circuit to enable within a processing period based on an external trigger and makes the signal processing unit process a physical quantity signal from the physical quantity sensor element intermittently for every processing period.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: September 4, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Takemi Yonezawa, Noriyuki Murashima
  • Patent number: 10027331
    Abstract: An oscillator includes a resonator; an oscillation circuit which oscillates the resonator; a D/A conversion circuit which receives digital data for controlling a frequency of the oscillation circuit; a first temperature sensor; and a temperature compensation circuit which is connected to the first temperature sensor. The oscillation circuit includes a first variable capacitor element and a second variable capacitor element. An output voltage of the D/A conversion circuit is applied to the first variable capacitor element. An output voltage of the temperature compensation circuit is applied to the second variable capacitor element.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: July 17, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Takemi Yonezawa, Masaaki Okubo, Kenji Hayashi
  • Publication number: 20180198452
    Abstract: An oscillator includes an oscillation source, multiple temperature control elements, and a controller adapted to perform control to suppress an increase in current consumed in one or more of the temperature control elements during at least part of a period from when operation of the oscillation source initiates to when the oscillation source reaches a specified temperature.
    Type: Application
    Filed: March 9, 2018
    Publication date: July 12, 2018
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Kensaku ISOHATA, Takayuki KIKUCHI, Takemi YONEZAWA
  • Patent number: 9941888
    Abstract: An oscillator includes an oscillation source, multiple temperature control elements, and a controller adapted to perform control to suppress an increase in current consumed in one or more of the temperature control elements during at least part of a period from when operation of the oscillation source initiates to when the oscillation source reaches a specified temperature.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: April 10, 2018
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Kensaku Isohata, Takayuki Kikuchi, Takemi Yonezawa
  • Patent number: 9772370
    Abstract: A physical quantity detecting sensor includes a physical quantity detecting sensor element and an IC connected to the physical quantity detecting sensor element. The IC includes: a logic circuit; an analog circuit; a first regulator that supplies a logic power supply voltage generated based on a power supply voltage to the logic circuit; a second regulator that is switched to enable or disable and supplies an analog power supply voltage, which is generated based on the power supply voltage when the second regulator is set to enable, to the analog circuit; and a switch for supplying the logic power supply voltage to the analog circuit when the second regulator is set to disable.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: September 26, 2017
    Assignee: Seiko Epson Corporation
    Inventors: Noriyuki Murashima, Takemi Yonezawa
  • Publication number: 20170194965
    Abstract: A circuit device includes a processor adapted to perform a signal processing of temperature compensation of an oscillation frequency based on temperature detection data from an external temperature sensor disposed outside the circuit device to output frequency control data, and an oscillation signal generation circuit adapted to generate an oscillation signal with the oscillation frequency corresponding to the frequency control data using the frequency control data and a resonator disposed in a thermostatic oven.
    Type: Application
    Filed: December 21, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA
  • Publication number: 20170194968
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency, the oscillation frequency being a frequency set by using frequency control data, and a processor that is configured to perform a signal process on input frequency control data, and. The processor is configured to acquire the frequency control data from which an environmental change component is removed of the environmental change component and an aging change component by using environmental change component information, and perform aging correction on the basis of the frequency control data from which the environmental change component is removed.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA
  • Publication number: 20170194966
    Abstract: A circuit device includes a digital interface, a processor, an oscillation signal generation circuit, a clock signal generation circuit that generates a clock signal having frequency obtained through multiplication of a frequency of the oscillation signal, and terminal groups of the digital interface and the clock signal generation circuit. The terminal group of the digital interface is disposed in a first region along a first side of the circuit device, and the terminal group of the clock signal generation circuit is disposed in any one of second, third and fourth regions of the circuit device.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA
  • Publication number: 20170194967
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency set by the frequency control data by using a resonator, and a processor that is configured to perform a signal process on input frequency control data to output frequency control data. The processor is configured to obtain a pre-estimated value x??(k) at a time step k by adding a post-estimated value x?(k?1) and a correction value D(k?1) at a time step k?1 together during a process of updating a pre-estimated value in a Karman filter process, and perform aging correction on the frequency control data on the basis of a result of the Karman filter process.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA
  • Publication number: 20170194971
    Abstract: A circuit device includes an oscillation signal generation circuit, a reference signal input terminal to which a reference signal is input, and an internal phase comparator that performs phase comparison between an input signal based on the oscillation signal and the reference signal. The oscillation signal generation circuit generates the oscillation signal using the frequency control data based on a result of the phase comparison from an external phase comparator which performs phase comparison between an input signal based on the oscillation signal and the reference signal in a first mode, and generates the oscillation signal using the frequency control data based on a result of the phase comparison from the internal phase comparator in a second mode.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA
  • Publication number: 20170194907
    Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency using a resonator, the oscillation frequency being a frequency set by using frequency control data, and a processor configured to perform a signal process on input frequency control data based on a phase comparison result between an input signal based on the oscillation signal and a reference signal. The processor is configured to estimate a true value for an observed value of the frequency control data based on the phase comparison result through a Karman filter process in a period before a hold-over state is detected, and generate aging-corrected frequency control data, in a case where the hold-over state is detected, by holding the true value at a timing corresponding to a timing of detecting the hold-over state, and by performing a calculation based on the true value.
    Type: Application
    Filed: December 20, 2016
    Publication date: July 6, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventor: Takemi YONEZAWA