Patents by Inventor Keitaro Iguchi

Keitaro Iguchi 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).

  • Patent number: 7507982
    Abstract: A signal processing circuit provided with an outside-light component reducing circuit capable of reducing an outside light component in the frequency separation method is provided. This is a signal detecting circuit which irradiates a pulse light from an LED to a windshield of a vehicle, receives a reflected light by a PD, processes the pulse signal from the PD and inputs it to a processing unit in order to automatically control a wiper for eliminating raindrops on the windshield of the vehicle. This is provided with a current—voltage converter circuit for converting the pulse signal from the LED to a voltage signal, an outside-light component reducing circuit provided in parallel with the current—voltage converter circuit for reducing the outside light component included in the output signal of the current—voltage converter circuit and a band-pass filter circuit/amplifier circuit for reducing the noise in the output signal of the current—voltage converter circuit and amplifying the output signal.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: March 24, 2009
    Assignee: Niles Co. Ltd.
    Inventors: Kazuto Kokuryo, Keitaro Iguchi, Yoshiteru Makino
  • Publication number: 20070138868
    Abstract: A signal processing circuit provided with an outside-light component reducing circuit capable of reducing an outside light component in the frequency separation method is provided. This is a signal detecting circuit which irradiates a pulse light from an LED to a windshield of a vehicle, receives a reflected light by a PD, processes the pulse signal from the PD and inputs it to a processing unit in order to automatically control a wiper for eliminating raindrops on the windshield of the vehicle. This is provided with a current-voltage converter circuit for converting the pulse signal from the LED to a voltage signal, an outside-light component reducing circuit provided in parallel with the current-voltage converter circuit for reducing the outside light component included in the output signal of the current-voltage converter circuit and a band-pass filter circuit/amplifier circuit for reducing the noise in the output signal of the current-voltage converter circuit and amplifying the output signal.
    Type: Application
    Filed: May 13, 2004
    Publication date: June 21, 2007
    Inventors: Kazuto Kokuryo, Keitaro Iguchi, Yoshiteru Makino