Patents by Inventor Seiji Nagakusa

Seiji Nagakusa 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).

  • Optical measuring device having d.c. component elimination
    Patent number: 6922577
    Abstract: An optical measuring device includes a sensor which emits light flashes toward a subject of detection with a light emitting element which is supplied with electric power from a rechargeable battery for a certain duration at certain intervals and receives reflected light from the subject with a light sensitive element. A subtractor subtracts a d.c. component from a sensed signal provided by the light sensitive element, thereby extracting a variation component. The subtractor has its output signal amplified with an amplifier, with the output thereof being A/D-converted with an A/D converter.
    Type: Grant
    Filed: February 10, 2003
    Date of Patent: July 26, 2005
    Assignee: Denso Corporation
    Inventors: Tetsuya Nakashima, Yasuji Inobe, Seiji Nagakusa, Teiyuu Kimura
  • Optical measuring device having d.c. component elimination
    Publication number: 20030158486
    Abstract: An optical measuring device includes a sensor which emits light flashes toward a subject of detection with a light emitting element which is supplied with electric power from a rechargeable battery for a certain duration at certain intervals and receives reflected light from the subject with a light sensitive element. A subtractor subtracts a d.c. component from a sensed signal provided by the light sensitive element, thereby extracting a variation component. The subtractor has its output signal amplified with an amplifier, with the output thereof being A/D-converted with an A/D converter.
    Type: Application
    Filed: February 10, 2003
    Publication date: August 21, 2003
    Inventors: Tetsuya Nakashima, Yasuji Inobe, Seiji Nagakusa, Teiyuu Kimura