Patents by Inventor Masashi Nakazato
Masashi Nakazato 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: 9866195Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: GrantFiled: July 11, 2017Date of Patent: January 9, 2018Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Masashi Nakazato, Motoyasu Nakao, Yuji Shintomi
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Publication number: 20170310298Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: ApplicationFiled: July 11, 2017Publication date: October 26, 2017Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shoji NAGUMO, Masashi NAKAZATO, Motoyasu NAKAO, Yuji SHINTOMI
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Patent number: 9748917Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: GrantFiled: July 15, 2014Date of Patent: August 29, 2017Assignee: Murata Manufacturing Co., Ltd.Inventors: Shoji Nagumo, Masashi Nakazato, Motoyasu Nakao, Yuji Shintomi
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Patent number: 9188616Abstract: A capacitance detecting circuit includes a constant current source supplying a constant current to a voltage detection point, a time measuring unit measuring time of charge until the voltage of the voltage detection point reaches a prescribed voltage, a storage unit and an operation unit. The storage unit stores first data obtained in advance concerning the time of charge of a capacitance element having a known capacitance value, and second data obtained in advance concerning the time of charge of a capacitance component. The operation unit generates third data representing the time of charge of an object of detection from a difference between the first measurement value of the time measuring unit when the capacitance component is connected to the voltage detection point and the second data, and based on the ratio between the third data and the first data and the known capacitance value, calculates the capacitance value of the object of detection.Type: GrantFiled: October 8, 2014Date of Patent: November 17, 2015Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shoji Nagumo, Masashi Nakazato, Yujie Dai, Xiaoxing Zhang, Yingjie Lu
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Publication number: 20150311881Abstract: A stray capacitance is generated between an antenna element and a ground electrode. A capacitance detection circuit detects the stray capacitance. An antenna matching circuit, is provided along a wireless communication signal path, which is a transmission path between the antenna element and a feeder circuit. A feedback control circuit transmits a control signal to the variable matching circuit on the basis of a detection result of the capacitance detection circuit in accordance with the stray capacitance. The capacitance detection circuit includes a constant current source and a timing circuit to measure the time taken to charge the antenna from the constant current source and for the voltage to reach a predetermined voltage.Type: ApplicationFiled: July 15, 2014Publication date: October 29, 2015Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Shoji NAGUMO, Masashi NAKAZATO, Motoyasu NAKAO, Yuji SHINTOMI
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Publication number: 20150084652Abstract: A capacitance detecting circuit includes a constant current source supplying a constant current to a voltage detection point, a time measuring unit measuring time of charge until the voltage of the voltage detection point reaches a prescribed voltage, a storage unit and an operation unit. The storage unit stores first data obtained in advance concerning the time of charge of a capacitance element having a known capacitance value, and second data obtained in advance concerning the time of charge of a capacitance component. The operation unit generates third data representing the time of charge of an object of detection from a difference between the first measurement value of the time measuring unit when the capacitance component is connected to the voltage detection point and the second data, and based on the ratio between the third data and the first data and the known capacitance value, calculates the capacitance value of the object of detection.Type: ApplicationFiled: October 8, 2014Publication date: March 26, 2015Inventors: Shoji Nagumo, Masashi Nakazato, Yujie Dai, Xiaoxing Zhang, Yingjie Lu