Patents by Inventor Taro AMAGAI

Taro AMAGAI 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: 11437892
    Abstract: An offset of an output voltage of a magnetic sensor caused by an external magnetic field is removed. A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor that is arranged at a predetermined mechanical angle with respect to the first magnetic sensor and detects the rotational position of the rotor; a signal amplifier that amplifies a difference between a first signal which is a signal output from the first magnetic sensor and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generator that converts an output signal of the signal amplifier into a pulse signal.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: September 6, 2022
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
  • Patent number: 11431230
    Abstract: An offset of an output voltage of a magnetic sensor caused by an external magnetic field is removed. A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor arranged at a position shifted by ?/N in a rotation direction of the rotor with respect to the first magnetic sensor when the number of pole pairs is N; a signal amplifier that amplifies a difference between a first signal which is a signal output from the first magnetic sensor and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: August 30, 2022
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
  • Publication number: 20220173734
    Abstract: Proposed is a drive circuit including: a driving NMOS transistor having a source set to a reference potential and a driving PMOS transistor having a source set to a first potential, the driving NMOS transistor and the driving PMOS transistor having a mutually common drain connected to a load; a first bipolar transistor configured to control on/off of the driving PMOS transistor; a first switching element that causes conduction or non-conduction between a gate and the source of the driving NMOS transistor; and a second switching element that causes conduction or non-conduction between a gate and the source of the driving PMOS transistor.
    Type: Application
    Filed: January 16, 2020
    Publication date: June 2, 2022
    Inventors: Masaki YOSHINAGA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Patent number: 11349374
    Abstract: A motor according to a disclosed embodiment includes: a plurality of magnetic sensors that output sine wave signals having a certain phase difference in order in accordance with rotation of a rotor; a signal amplifier that amplifies a difference between an output signal of each of the plurality of magnetic sensors and an average signal that is an average of the output signals of the plurality of magnetic sensors; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: May 31, 2022
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
  • Patent number: 11277083
    Abstract: A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor arranged at a rotation center of the rotor; a signal amplifier that amplifies a difference between a first signal, which is a signal output from the first magnetic sensor, and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: March 15, 2022
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
  • Patent number: 11183961
    Abstract: An arithmetic circuit includes an auto-zero amplification circuit that compensates an offset of an entered differential signal, and a comparator circuit that converts an output signal from the auto-zero amplification circuit to a digital signal. The auto-zero amplification circuit and comparator circuit are provided in the same package.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: November 23, 2021
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Taro Amagai, Akiko Ikeda
  • Patent number: 11047929
    Abstract: A signal processing circuit amplifies a signal of a magnetic sensor that changes according to the magnitude of a magnetic force. The signal of the magnetic sensor is a pair of signals inverted from each other with respect to a reference voltage. The signal processing circuit includes: a high-pass filter that performs a high-pass filtering process on the complementary signals from the magnetic sensor; a differential amplifier that receives the complementary signals having been subjected to the high-pass filtering process by the high-pass filter as a differential input signal and amplifies the differential input signal at a predetermined amplification factor based on the reference voltage; and a comparator that outputs a binary signal indicating a comparison result between an output signal of the differential amplifier and the reference voltage.
    Type: Grant
    Filed: April 1, 2020
    Date of Patent: June 29, 2021
    Assignee: NIDEC CORPORATION
    Inventors: Masaki Yoshinaga, Taro Amagai, Akiko Ikeda, Kengo Araki
  • Publication number: 20200366162
    Abstract: A motor according to a disclosed embodiment includes: a plurality of magnetic sensors that output sine wave signals having a certain phase difference in order in accordance with rotation of a rotor; a signal amplifier that amplifies a difference between an output signal of each of the plurality of magnetic sensors and an average signal that is an average of the output signals of the plurality of magnetic sensors; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Application
    Filed: April 13, 2020
    Publication date: November 19, 2020
    Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Publication number: 20200336048
    Abstract: An offset of an output voltage of a magnetic sensor caused by an external magnetic field is removed. A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor arranged at a position shifted by ?/N in a rotation direction of the rotor with respect to the first magnetic sensor when the number of pole pairs is N; a signal amplifier that amplifies a difference between a first signal which is a signal output from the first magnetic sensor and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Application
    Filed: April 6, 2020
    Publication date: October 22, 2020
    Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Publication number: 20200336047
    Abstract: An offset of an output voltage of a magnetic sensor caused by an external magnetic field is removed. A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor that is arranged at a predetermined mechanical angle with respect to the first magnetic sensor and detects the rotational position of the rotor; a signal amplifier that amplifies a difference between a first signal which is a signal output from the first magnetic sensor and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generator that converts an output signal of the signal amplifier into a pulse signal.
    Type: Application
    Filed: April 6, 2020
    Publication date: October 22, 2020
    Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Publication number: 20200321895
    Abstract: A motor according to a disclosed embodiment includes: a first magnetic sensor that detects a rotational position of a rotor; a second magnetic sensor arranged at a rotation center of the rotor; a signal amplifier that amplifies a difference between a first signal, which is a signal output from the first magnetic sensor, and a second signal which is a signal output from the second magnetic sensor; and a pulse signal generation unit that converts an output signal of the signal amplifier into a pulse signal.
    Type: Application
    Filed: March 31, 2020
    Publication date: October 8, 2020
    Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Publication number: 20200319266
    Abstract: A signal processing circuit amplifies a signal of a magnetic sensor that changes according to the magnitude of a magnetic force. The signal of the magnetic sensor is a pair of signals inverted from each other with respect to a reference voltage. The signal processing circuit includes: a high-pass filter that performs a high-pass filtering process on the complementary signals from the magnetic sensor; a differential amplifier that receives the complementary signals having been subjected to the high-pass filtering process by the high-pass filter as a differential input signal and amplifies the differential input signal at a predetermined amplification factor based on the reference voltage; and a comparator that outputs a binary signal indicating a comparison result between an output signal of the differential amplifier and the reference voltage.
    Type: Application
    Filed: April 1, 2020
    Publication date: October 8, 2020
    Inventors: Masaki YOSHINAGA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
  • Publication number: 20190196580
    Abstract: A light emitting apparatus emits light toward a real space in which a user wearing a head-mounted display is present. The light emitting apparatus includes a first light emitting unit that emits first light, which is used as a reference signal, a second light emitting unit that emits second light, which is used as a scanning signal that scans the real space at a timing based on the reference signal, and a controller that controls the first light emitting unit. The reference signal includes notification information to be submitted to the head-mounted display.
    Type: Application
    Filed: October 24, 2018
    Publication date: June 27, 2019
    Inventors: Tetsuo ENOMOTO, Akiko IKEDA, Taro AMAGAI
  • Publication number: 20190097564
    Abstract: An arithmetic circuit includes an auto-zero amplification circuit that compensates an offset of an entered differential signal, and a comparator circuit that converts an output signal from the auto-zero amplification circuit to a digital signal. The auto-zero amplification circuit and comparator circuit are provided in the same package.
    Type: Application
    Filed: September 10, 2018
    Publication date: March 28, 2019
    Inventors: Masaki YOSHINAGA, Taro AMAGAI, Akiko IKEDA