Patents by Inventor Toshinari Tabata
Toshinari Tabata 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: 10084215Abstract: A first cell string provided in a first battery module has a larger allowable current value than a plurality of cell strings provided in second and third battery modules. The battery module is provided with a current limiting circuit that limits the charge and discharge currents of the second cell string. When the current value detected by a current sensor is zero, the switch is turned off. In this condition, when the terminal voltage value of the third cell string is different from the terminal voltage value of the second cell string, a second switch switches the connection between the second and third battery modules in order to interpose the current limiting circuit between the second and third cell strings.Type: GrantFiled: November 17, 2016Date of Patent: September 25, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Ryoji Yamato, Naoki Fujii, Gaku Kamitani, Midori Sunaga, Toshinari Tabata
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Patent number: 9775526Abstract: In the present invention, a pump driving circuit includes a step-up unit that steps up a first DC voltage from a power supply and outputs it as a second DC voltage, and an H bridge unit that has first and second series circuits that each include two switching elements connected in series between a high potential corresponding to the second DC voltage and a reference potential. According to a control signal from the control unit, the two switching elements of the first series circuit and the two switching elements of the second series circuit are switched on and off. A voltage generated between a first contact point between the two switching elements of the first series circuit, and a second contact point between the two switching elements of the second series circuit is used as a driving voltage for driving a pump.Type: GrantFiled: October 17, 2014Date of Patent: October 3, 2017Assignees: OMRON HEALTHCARE CO., LTD., MURATA MANUFACTURING CO., LTD.Inventors: Hiroyasu Ariga, Kenjiro Okaguchi, Toshinari Tabata, Gaku Kamitani
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Publication number: 20170149102Abstract: A first cell string provided in a first battery module has a larger allowable current value than a plurality of cell strings provided in second and third battery modules. The battery module is provided with a current limiting circuit that limits the charge and discharge currents of the second cell string. When the current value detected by a current sensor is zero, the switch is turned off. In this condition, when the terminal voltage value of the third cell string is different from the terminal voltage value of the second cell string, a second switch switches the connection between the second and third battery modules in order to interpose the current limiting circuit between the second and third cell strings.Type: ApplicationFiled: November 17, 2016Publication date: May 25, 2017Inventors: Ryoji Yamato, Naoki Fujii, Gaku Kamitani, Midori Sunaga, Toshinari Tabata
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Publication number: 20150038858Abstract: In the present invention, a pump driving circuit includes a step-up unit that steps up a first DC voltage from a power supply and outputs it as a second DC voltage, and an H bridge unit that has first and second series circuits that each include two switching elements connected in series between a high potential corresponding to the second DC voltage and a reference potential. According to a control signal from the control unit, the two switching elements of the first series circuit and the two switching elements of the second series circuit are switched on and off. A voltage generated between a first contact point between the two switching elements of the first series circuit, and a second contact point between the two switching elements of the second series circuit is used as a driving voltage for driving a pump.Type: ApplicationFiled: October 17, 2014Publication date: February 5, 2015Inventors: Hiroyasu ARIGA, Kenjiro OKAGUCHI, Toshinari TABATA, Gaku KAMITANI
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Patent number: 8508104Abstract: In a piezoelectric actuator driver circuit, a resistor provided to detect current is inserted in a current path for a piezoelectric actuator. A signal of a decreased voltage of the resistor is subjected to positive feedback to an amplifier circuit via a band-pass filter. An output signal of the amplifier circuit is subjected to negative feedback to the amplifier circuit via a band-elimination filter. The band-pass filter allows a signal of a fundamental resonant frequency of a piezoelectric device, which includes the piezoelectric actuator, to pass therethrough, and the band-elimination filter blocks the signal of the fundamental resonant frequency. Thus, a loop gain at a higher-order resonant frequency with respect to the fundamental resonant frequency becomes very low and a higher-order resonant mode can be effectively suppressed.Type: GrantFiled: August 1, 2012Date of Patent: August 13, 2013Assignee: Murata Manufacturing Co., Ltd.Inventors: Gaku Kamitani, Toshinari Tabata
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Publication number: 20120293041Abstract: In a piezoelectric actuator driver circuit, a resistor provided to detect current is inserted in a current path for a piezoelectric actuator. A signal of a decreased voltage of the resistor is subjected to positive feedback to an amplifier circuit via a band-pass filter. An output signal of the amplifier circuit is subjected to negative feedback to the amplifier circuit via a band-elimination filter. The band-pass filter allows a signal of a fundamental resonant frequency of a piezoelectric device, which includes the piezoelectric actuator, to pass therethrough, and the band-elimination filter blocks the signal of the fundamental resonant frequency. Thus, a loop gain at a higher-order resonant frequency with respect to the fundamental resonant frequency becomes very low and a higher-order resonant mode can be effectively suppressed.Type: ApplicationFiled: August 1, 2012Publication date: November 22, 2012Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Gaku KAMITANI, Toshinari TABATA
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Patent number: 8314531Abstract: In a piezoelectric-actuator driving circuit for driving a piezoelectric actuator, an amplifier circuit amplifies a signal output from a feedback circuit and supplies the amplified signal to a non-inverting amplifier circuit and an inverting amplifier circuit. The non-inverting amplifier circuit amplifies the output voltage of the amplifier circuit with a predetermined gain and applies the amplified voltage to a first terminal of the piezoelectric actuator. The inverting amplifier circuit inverts and amplifies the output voltage of the amplifier circuit with the same gain as that of the non-inverting amplifier circuit and then applies the amplified voltage to a second terminal of the piezoelectric actuator through resistors. The feedback circuit amplifies a difference between voltages at respective ends of the resistor and supplies the amplified difference to the amplifier circuit.Type: GrantFiled: September 16, 2010Date of Patent: November 20, 2012Assignee: Murata Manufacturing Co., Ltd.Inventors: Midori Sunaga, Toshinari Tabata, Gaku Kamitani
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Patent number: 8283836Abstract: In a piezoelectric actuator driver circuit, a resistor provided to detect current is inserted in a current path for a piezoelectric actuator. A signal of a decreased voltage of the resistor is subjected to positive feedback to an amplifier circuit via a band-pass filter. An output signal of the amplifier circuit is subjected to negative feedback to the amplifier circuit via a band-elimination filter. The band-pass filter allows a signal of a fundamental resonant frequency of a piezoelectric device, which includes the piezoelectric actuator, to pass therethrough, and the band-elimination filter blocks the signal of the fundamental resonant frequency. Thus, a loop gain at a higher-order resonant frequency with respect to the fundamental resonant frequency becomes very low and a higher-order resonant mode can be effectively suppressed.Type: GrantFiled: September 16, 2010Date of Patent: October 9, 2012Assignee: Murata Manufacturing Co., Ltd.Inventors: Gaku Kamitani, Toshinari Tabata
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Publication number: 20110068658Abstract: In a piezoelectric actuator driver circuit, a resistor provided to detect current is inserted in a current path for a piezoelectric actuator. A signal of a decreased voltage of the resistor is subjected to positive feedback to an amplifier circuit via a band-pass filter. An output signal of the amplifier circuit is subjected to negative feedback to the amplifier circuit via a band-elimination filter. The band-pass filter allows a signal of a fundamental resonant frequency of a piezoelectric device, which includes the piezoelectric actuator, to pass therethrough, and the band-elimination filter blocks the signal of the fundamental resonant frequency. Thus, a loop gain at a higher-order resonant frequency with respect to the fundamental resonant frequency becomes very low and a higher-order resonant mode can be effectively suppressed.Type: ApplicationFiled: September 16, 2010Publication date: March 24, 2011Applicant: Murata Manufacturing Co., Ltd.Inventors: Gaku Kamitani, Toshinari Tabata
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Publication number: 20110068657Abstract: In a piezoelectric-actuator driving circuit for driving a piezoelectric actuator, an amplifier circuit amplifies a signal output from a feedback circuit and supplies the amplified signal to a non-inverting amplifier circuit and an inverting amplifier circuit. The non-inverting amplifier circuit amplifies the output voltage of the amplifier circuit with a predetermined gain and applies the amplified voltage to a first terminal of the piezoelectric actuator. The inverting amplifier circuit inverts and amplifies the output voltage of the amplifier circuit with the same gain as that of the non-inverting amplifier circuit and then applies the amplified voltage to a second terminal of the piezoelectric actuator through resistors. The feedback circuit amplifies a difference between voltages at respective ends of the resistor and supplies the amplified difference to the amplifier circuit.Type: ApplicationFiled: September 16, 2010Publication date: March 24, 2011Applicant: MURATA MANUFACTURING CO., LTD.Inventors: Midori SUNAGA, Toshinari TABATA, Gaku KAMITANI
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Patent number: 6480010Abstract: A piezoelectric ceramic device is heated so that the temperature is increased to a temperature in the vicinity of the maximum temperature at which the device, when the temperature is returned to ordinary temperature, is returned to substantially the same piezoelectric characteristic before heating. In the state that the piezoelectric ceramic device is heated, and the temperature is increased, at least one of the piezoelectric phase characteristic and the impedance characteristic of the piezoelectric ceramic device is measured. The measurement is compared with a standard characteristic, whereby an internal defect of the piezoelectric ceramic device is detected, based on results of the comparison.Type: GrantFiled: December 22, 2000Date of Patent: November 12, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Masato Ikuta, Toshinari Tabata, Masao Nishimura
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Patent number: 6448525Abstract: Capacitor characteristics measurement apparatus and packing apparatus includes a turntable (1) intermittently driven at a constant pitch to supply capacitors (C) from a parts feeder (8) to a holder section (2) of the turntable (1) in a one-by-one manner. A capacitance measurement section (4) and an IR prediction section (5) are provided to determine whether each capacitor is acceptable or defective in quality based on the measured values obtainable from these sections (4, 5). The IR prediction section (5) applies a DC voltage to a capacitor while predicting the current value at termination of chargeup by use of its initial current value in the charge region of an insulation polarization component thereof upon application of the voltage thereto.Type: GrantFiled: April 7, 1998Date of Patent: September 10, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshinao Nishioka, Mitsuru Kitagawa, Masao Nishimura, Toshinari Tabata
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Publication number: 20020033361Abstract: Capacitor characteristics measurement apparatus and packing apparatus includes a turntable (1) intermittently driven at a constant pitch to supply capacitors (C) from a parts feeder (8) to a holder section (2) of the turntable (1) in a one-by-one manner. A capacitance measurement section (4) and an IR prediction section (5) are provided to determine whether each capacitor is acceptable or defective in quality based on the measured values obtainable from these sections (4, 5). The IR prediction section (5) applies a DC voltage to a capacitor while predicting the current value at termination of chargeup by use of its initial current value in the charge region of an insulation polarization component thereof upon application of the voltage thereto.Type: ApplicationFiled: October 17, 2001Publication date: March 21, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Yoshinao Nishioka, Mitsuru Kitagawa, Masao Nishimura, Toshinari Tabata
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Publication number: 20020024346Abstract: A piezoelectric ceramic device is heated so that the temperature is increased to a temperature in the vicinity of the maximum temperature at which the device, when the temperature is returned to ordinary temperature, is returned to substantially the same piezoelectric characteristic before heating. In the state that the piezoelectric ceramic device is heated, and the temperature is increased, at least one of the piezoelectric phase characteristic and the impedance characteristic of the piezoelectric ceramic device is measured. The measurement is compared with a standard characteristic, whereby an internal defect of the piezoelectric ceramic device is detected, based on results of the comparison.Type: ApplicationFiled: December 22, 2000Publication date: February 28, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Masato Ikuta, Toshinari Tabata, Masao Nishimura
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Patent number: 6204638Abstract: A capacitor can be charged at a high speed by applying a direct current voltage intermittently to the capacitor. The direct current voltage is intermittently applied to the capacitor such that a preceding applied voltage E1 is larger than a succeeding applied voltage E2. Thus, the charging is swiftly progresses and the capacitor can be charged at a higher speed than when the voltage is applied continuously.Type: GrantFiled: January 6, 1998Date of Patent: March 20, 2001Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshinao Nishioka, Toshinari Tabata
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Patent number: 6066940Abstract: When DC voltages are intermittently applied to a capacitor and when an initially applied voltage E.sub.1 is higher than a subsequently applied voltage E.sub.2, charging rapidly advances even during a period in which no voltage is applied. Higher-speed charging is performed than in a case in which the same voltage is continuously applied.Type: GrantFiled: November 6, 1998Date of Patent: May 23, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshinao Nishioka, Toshinari Tabata
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Patent number: 6043665Abstract: A method for accurately measuring the insulation resistance of a capacitor while reducing time taken for the measurement. To this end, a current calculation equation is first obtained based on an equivalent circuit of a capacitor; then, the calculation equation is modified or corrected based on the degree of coincidence between an actually measured current value m(t) and a calculated current value i(t), the former being within a charge-up region of a dielectric polarization component upon initial application of a voltage; next, the current value at a time point of chargeup termination is predicted or estimated by use of this modified calculation equation.Type: GrantFiled: December 4, 1997Date of Patent: March 28, 2000Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshinao Nishioka, Mitsuru Kitagawa, Masao Nishimura, Toshinari Tabata