Patents by Inventor Kengo Araki
Kengo Araki 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).
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Patent number: 11437892Abstract: 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: GrantFiled: April 6, 2020Date of Patent: September 6, 2022Assignee: NIDEC CORPORATIONInventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
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Patent number: 11431230Abstract: 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: GrantFiled: April 6, 2020Date of Patent: August 30, 2022Assignee: NIDEC CORPORATIONInventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
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Publication number: 20220173734Abstract: 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: ApplicationFiled: January 16, 2020Publication date: June 2, 2022Inventors: Masaki YOSHINAGA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Patent number: 11349374Abstract: 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: GrantFiled: April 13, 2020Date of Patent: May 31, 2022Assignee: NIDEC CORPORATIONInventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
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Patent number: 11277083Abstract: 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: GrantFiled: March 31, 2020Date of Patent: March 15, 2022Assignee: NIDEC CORPORATIONInventors: Masaki Yoshinaga, Tomohiro Fukumura, Taro Amagai, Akiko Ikeda, Kengo Araki
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Patent number: 11047929Abstract: 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: GrantFiled: April 1, 2020Date of Patent: June 29, 2021Assignee: NIDEC CORPORATIONInventors: Masaki Yoshinaga, Taro Amagai, Akiko Ikeda, Kengo Araki
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Publication number: 20200366162Abstract: 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: ApplicationFiled: April 13, 2020Publication date: November 19, 2020Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Publication number: 20200336048Abstract: 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: ApplicationFiled: April 6, 2020Publication date: October 22, 2020Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Publication number: 20200336047Abstract: 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: ApplicationFiled: April 6, 2020Publication date: October 22, 2020Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Publication number: 20200321895Abstract: 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: ApplicationFiled: March 31, 2020Publication date: October 8, 2020Inventors: Masaki YOSHINAGA, Tomohiro FUKUMURA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Publication number: 20200319266Abstract: 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: ApplicationFiled: April 1, 2020Publication date: October 8, 2020Inventors: Masaki YOSHINAGA, Taro AMAGAI, Akiko IKEDA, Kengo ARAKI
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Patent number: 4481138Abstract: A substance having opiate and analgesic activity is obtained from swine duodenum. The opioid substance of the present invention comprises a heptadecapeptide having the following primary amino acid structure: Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln.Type: GrantFiled: July 21, 1982Date of Patent: November 6, 1984Assignee: Eisai Co., Ltd.Inventors: Shinro Tachibana, Kengo Araki, Shizuko Ohya, Seiji Yoshida