Patents by Inventor Shoichiro YOKOO
Shoichiro YOKOO 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: 11951737Abstract: A distance between the first circuit and the second circuit is a first distance, a distance between the first circuit and the temperature detection circuit is a second distance longer than the first distance, and a distance between the second circuit and the temperature detection circuit is a third distance longer than the first distance.Type: GrantFiled: July 13, 2022Date of Patent: April 9, 2024Assignee: Seiko Epson CorporationInventors: Shoichiro Yokoo, Noritaka Ide, Eiju Hirai, Masaki Mori, Yu Shiozawa
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Patent number: 11904607Abstract: An amplifier circuit, a level shift circuit; and a demodulation circuit, in which in a second mode obtained by shifting a reference potential of the amplification modulation signal to a second potential having a potential higher than a first potential, the second gate driver included in the level shift circuit performs a constant voltage control that outputs a third gate signal controlling a third transistor to be conductive and a fourth gate signal controlling a fourth transistor to be non-conductive, and a charge control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.Type: GrantFiled: November 30, 2021Date of Patent: February 20, 2024Assignee: SEIKO EPSON CORPORATIONInventors: Shoichiro Yokoo, Noritaka Ide, Kunio Tabata
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Patent number: 11904606Abstract: A level shift circuit and when a reference potential of the amplification modulation signal is transitioned from a first potential to a second potential having a high potential, a second gate driver performs a first control that outputs a third gate signal controlling a third transistor to be non-conductive and a fourth gate signal controlling a fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive, and a second control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive after the first control, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.Type: GrantFiled: November 30, 2021Date of Patent: February 20, 2024Assignee: SEIKO EPSON CORPORATIONInventors: Noritaka Ide, Kunio Tabata, Shoichiro Yokoo
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Patent number: 11813860Abstract: A first switching circuit, a second switching circuit, a first bootstrap circuit that is coupled to the first switching circuit and the second switching circuit, and a smoothing circuit and outputs a drive signal are provided, in which the second switching circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor of which the first voltage is supplied, and which is driven based on the third gate signal, a fourth transistor which is driven based on the fourth gate signal, and a second bootstrap circuit that includes a second capacitive element supplying a third voltage to the second gate driver and coupled to a second output point and the second gate driver, and a second diode of which the first voltage is supplied and which is coupled to the second capacitive element.Type: GrantFiled: November 30, 2021Date of Patent: November 14, 2023Inventors: Kunio Tabata, Noritaka Ide, Shoichiro Yokoo
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Publication number: 20230302788Abstract: A liquid discharge apparatus includes a liquid discharge head that includes a plurality of capacitive loads driven by being supplied with a drive signal and discharges a liquid by driving the plurality of capacitive loads, and a capacitive load drive circuit, in which the capacitive load drive circuit includes a correction circuit, a modulation circuit, an amplification circuit, a demodulation circuit, and a feedback circuit, and the correction circuit outputs the correction base drive signal corrected according to the number of drive capacitive loads driven by the drive signal among the plurality of capacitive loads.Type: ApplicationFiled: March 22, 2023Publication date: September 28, 2023Inventors: Noritaka IDE, Kunio TABATA, Shoichiro YOKOO
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Publication number: 20230302787Abstract: A liquid discharge apparatus includes a correction circuit that outputs a correction base drive signal obtained, a level shift circuit that outputs a level shift amplified modulation signal, and a demodulation circuit that outputs the drive signal by demodulating the level shift amplified modulation signal, the correction circuit outputs the correction base drive signal corrected by a first correction value, in a first mode in which the level shift circuit outputs the level shift amplified modulation signal having the reference potential of the amplified modulation signal as a first potential, and outputs the correction base drive signal corrected by a second correction value different from the first correction value, in a second mode in which the level shift circuit outputs the level shift amplified modulation signal obtained by level-shifting the reference potential of the amplified modulation signal to a second potential different from the first potential.Type: ApplicationFiled: March 22, 2023Publication date: September 28, 2023Inventors: Noritaka IDE, Kunio TABATA, Shoichiro YOKOO
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Patent number: 11760087Abstract: A liquid discharging apparatus has: a head unit that discharges a liquid; and a control unit that controls the operation of the head unit. The head unit has: a driving circuit board that includes a driving signal output circuit that outputs a driving signal, and also includes a substrate on which the driving signal output circuit is mounted; a discharge head that includes a driving element driven by the driving signal, a switching circuit that selectively supplies the driving signal to the driving element, and a nozzle plate in which a nozzle is formed, the nozzle discharging the liquid by being driven by the driving element; a first flow path member through which the liquid to be discharged from the nozzle passes; and a first heat dissipating member coupled to the driving circuit board. The first heat dissipating member is coupled to the first flow path member.Type: GrantFiled: July 27, 2021Date of Patent: September 19, 2023Inventor: Shoichiro Yokoo
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Publication number: 20230020830Abstract: A distance between the first circuit and the second circuit is a first distance, a distance between the first circuit and the temperature detection circuit is a second distance longer than the first distance, and a distance between the second circuit and the temperature detection circuit is a third distance longer than the first distance.Type: ApplicationFiled: July 13, 2022Publication date: January 19, 2023Inventors: Shoichiro YOKOO, Noritaka IDE, Eiju HIRAI, Masaki MORI, Yu SHIOZAWA
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Publication number: 20230018898Abstract: A liquid discharge head unit includes a liquid discharge head that has a first detection resistor that is provided to correspond to a first piezoelectric element group, a second detection resistor that is provided to correspond to a second piezoelectric element group, a power supply circuit that causes a current to flow through the first detection resistor and the second detection resistor, a voltage detection circuit that detects a voltage, and a switching circuit that is configured to switch between a first state in which the voltage detection circuit is configured to detect a voltage generated in the first detection resistor due to the current flowing from the power supply circuit and a second state in which the voltage detection circuit is configured to detect a voltage generated in the second detection resistor due to the current flowing from the power supply circuit.Type: ApplicationFiled: July 13, 2022Publication date: January 19, 2023Inventors: Noritaka IDE, Shoichiro YOKOO, Eiju HIRAI, Yu SHIOZAWA, Masaki MORI
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Publication number: 20220169012Abstract: A level shift circuit and when a reference potential of the amplification modulation signal is transitioned from a first potential to a second potential having a high potential, a second gate driver performs a first control that outputs a third gate signal controlling a third transistor to be non-conductive and a fourth gate signal controlling a fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive, and a second control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive after the first control, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.Type: ApplicationFiled: November 30, 2021Publication date: June 2, 2022Inventors: Noritaka IDE, Kunio TABATA, Shoichiro YOKOO
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Publication number: 20220169014Abstract: A first switching circuit, a second switching circuit, a first bootstrap circuit that is coupled to the first switching circuit and the second switching circuit, and a smoothing circuit and outputs a drive signal are provided, in which the second switching circuit includes a second gate driver that outputs a third gate signal and a fourth gate signal, a third transistor of which the first voltage is supplied, and which is driven based on the third gate signal, a fourth transistor which is driven based on the fourth gate signal, and a second bootstrap circuit that includes a second capacitive element supplying a third voltage to the second gate driver and coupled to a second output point and the second gate driver, and a second diode of which the first voltage is supplied and which is coupled to the second capacitive element.Type: ApplicationFiled: November 30, 2021Publication date: June 2, 2022Inventors: Kunio TABATA, Noritaka IDE, Shoichiro YOKOO
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Publication number: 20220169013Abstract: An amplifier circuit, a level shift circuit; and a demodulation circuit, in which in a second mode obtained by shifting a reference potential of the amplification modulation signal to a second potential having a potential higher than a first potential, the second gate driver included in the level shift circuit performs a constant voltage control that outputs a third gate signal controlling a third transistor to be conductive and a fourth gate signal controlling a fourth transistor to be non-conductive, and a charge control that outputs the third gate signal controlling the third transistor to be non-conductive and the fourth gate signal controlling the fourth transistor to be conductive, and then outputs the third gate signal controlling the third transistor to be conductive and the fourth gate signal controlling the fourth transistor to be non-conductive.Type: ApplicationFiled: November 30, 2021Publication date: June 2, 2022Inventors: Shoichiro YOKOO, Noritaka IDE, Kunio TABATA
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Publication number: 20220032613Abstract: A liquid discharging apparatus has: a head unit that discharges a liquid; and a control unit that controls the operation of the head unit. The head unit has: a driving circuit board that includes a driving signal output circuit that outputs a driving signal, and also includes a substrate on which the driving signal output circuit is mounted; a discharge head that includes a driving element driven by the driving signal, a switching circuit that selectively supplies the driving signal to the driving element, and a nozzle plate in which a nozzle is formed, the nozzle discharging the liquid by being driven by the driving element; a first flow path member through which the liquid to be discharged from the nozzle passes; and a first heat dissipating member coupled to the driving circuit board. The first heat dissipating member is coupled to the first flow path member.Type: ApplicationFiled: July 27, 2021Publication date: February 3, 2022Applicant: Seiko Epson CorporationInventor: Shoichiro YOKOO