Patents by Inventor Fumiyuki Niwa

Fumiyuki Niwa 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).

  • Voltage supply circuit, power supply circuit, microphone unit using the same, and microphone unit sensitivity adjustment method
    Patent number: 7929716
    Abstract: A voltage supply circuit includes a power supply booster, an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to a sensor, and an output voltage setting part including a feedback resistor for the amplifier. The feedback resistor has resistance determined according to a set value of a bias voltage of the sensor.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: April 19, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Fumiyuki Niwa, Hiroshige Kinoshita, Masayuki Ida
  • Voltage supply circuit and microphone unit
    Patent number: 7864970
    Abstract: A voltage supply circuit includes a booster outputting a voltage boosted from a power supply voltage and an amplifier operating with a voltage output from the booster as a power supply and supplying a bias voltage to a sensor. An output voltage value of the booster that generates a power supply voltage of the amplifier is set according to a signal for specifying a sensitivity of the sensor.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: January 4, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Fumiyuki Niwa, Masayuki Ida, Hiroshige Kinoshita
  • Voltage supply circuit, power supply circuit, microphone unit using the same, and microphone unit sensitivity adjustment method
    Publication number: 20060147061
    Abstract: A voltage supply circuit includes a power supply booster, an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to a sensor, and an output voltage setting part including a feedback resistor for the amplifier. The feedback resistor has resistance determined according to a set value of a bias voltage of the sensor.
    Type: Application
    Filed: January 5, 2006
    Publication date: July 6, 2006
    Inventors: Fumiyuki Niwa, Hiroshige Kinoshita, Masayuki Ida
  • Voltage supply circuit and microphone unit
    Publication number: 20060147062
    Abstract: A voltage supply circuit includes a booster outputting a voltage boosted from a power supply voltage and an amplifier operating with a voltage output from the booster as a power supply and supplying a bias voltage to a sensor. An output voltage value of the booster that generates a power supply voltage of the amplifier is set according to a signal for specifying a sensitivity of the sensor.
    Type: Application
    Filed: January 5, 2006
    Publication date: July 6, 2006
    Inventors: Fumiyuki Niwa, Masayuki Ida, Hiroshige Kinoshita
  • Stepping motor driving apparatus having small time constant regenerative current path
    Patent number: 6114826
    Abstract: In an apparatus for driving a stepping motor in a micro step manner by a PWM control signal generated based on a sense voltage, including a sense resistor for generating the sense voltage, a driving current path including the sense resistor and the stepping motor is provided and is operated so that a driving current flows through the stepping motor, when the PWM control signal is activated. A regenerative current path including the sense resistor and is provided the stepping motor and is operated so that a regenerative current flows through the stepping motor, when the PWM control signal is not activated. A resistance of the regenerative current path is larger than a resistance of the driving current path.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: September 5, 2000
    Assignee: NEC Corporation
    Inventors: Haruo Nishiura, Fumiyuki Niwa