Patents by Inventor Makoto Hangaishi

Makoto Hangaishi 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).

  • Ad converting device, dial-type input device, and resistance-voltage conversion circuit
    Patent number: 8525722
    Abstract: An AD converting device includes a resistance-voltage conversion circuit which changes a first integrated voltage in proportion to a product of a varied resistance of a variable resistance and an electrical current applied to the variable resistance and changes a second integrated voltage and a reference voltage in proportion to a product of a total resistance of the variable resistance and the electrical current.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: September 3, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiro Yasuda, Makoto Hangaishi
  • AD CONVERTING DEVICE, DIAL-TYPE INPUT DEVICE, AND RESISTANCE-VOLTAGE CONVERSION CIRCUIT
    Publication number: 20120235845
    Abstract: An AD converting device includes a resistance-voltage conversion circuit which changes a first integrated voltage in proportion to a product of a varied resistance of a variable resistance and an electrical current applied to the variable resistance and changes a second integrated voltage and a reference voltage in proportion to a product of a total resistance of the variable resistance and the electrical current.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 20, 2012
    Applicant: Ricoh Company, Ltd.
    Inventors: Toshiro YASUDA, Makoto Hangaishi
  • Differential output circuit and semiconductor device having the same
    Patent number: 7304506
    Abstract: A differential output circuit first and second transistors forming a differential pair and having control electrodes input with binary signals, a constant current circuit supplying a constant current to the first and second transistors, and a protection circuit protecting the first and second transistors from external noise. The protection circuit has transistors respectively coupled in parallel to the first and second transistors and input with a first power supply voltage, and transistors respectively coupled between a second power supply voltage and first and second output terminals of the differential output circuit.
    Type: Grant
    Filed: February 24, 2006
    Date of Patent: December 4, 2007
    Assignee: Ricoh Company, Ltd.
    Inventor: Makoto Hangaishi
  • Differential output circuit and semiconductor device having the same
    Publication number: 20060192588
    Abstract: A differential output circuit first and second transistors forming a differential pair and having control electrodes input with binary signals, a constant current circuit supplying a constant current to the first and second transistors, and a protection circuit protecting the first and second transistors from external noise. The protection circuit has transistors respectively coupled in parallel to the first and second transistors and input with a first power supply voltage, and transistors respectively coupled between a second power supply voltage and first and second output terminals of the differential output circuit.
    Type: Application
    Filed: February 24, 2006
    Publication date: August 31, 2006
    Inventor: Makoto Hangaishi
  • Differential amplifying method and apparatus capable of responding to a wide input voltage range
    Patent number: 6777984
    Abstract: A differential amplifying apparatus includes first and second differential pair circuits having opposite conductivity, first and second current sources, first and second current mirror circuits, and a first voltage amplifying circuit. The first current source is connected between the first differential pair circuit and a first power source terminal, biasing the first differential pair circuit. The second current source is connected between the second differential pair circuit and a second power source terminal, biasing the second differential pair circuit. The first current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The second current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The first voltage amplifying circuit amplifies voltages from the first differential pair circuit and outputs amplified voltages.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: August 17, 2004
    Assignee: Ricoh Company, LTD
    Inventor: Makoto Hangaishi
  • Differential amplifying method and apparatus capable of responding to a wide input voltage range
    Publication number: 20030076163
    Abstract: A differential amplifying apparatus includes first and second differential pair circuits having opposite conductivity, first and second current sources, first and second current mirror circuits, and a first voltage amplifying circuit. The first current source is connected between the first differential pair circuit and a first power source terminal, biasing the first differential pair circuit. The second current source is connected between the second differential pair circuit and a second power source terminal, biasing the second differential pair circuit. The first current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The second current mirror circuit is connected between a corresponding output terminal of the second differential pair circuit and the first power source terminal. The first voltage amplifying circuit amplifies voltages from the first differential pair circuit and outputs amplified voltages.
    Type: Application
    Filed: September 20, 2002
    Publication date: April 24, 2003
    Applicant: Ricoh Company, Ltd.
    Inventor: Makoto Hangaishi