Patents by Inventor Mitsuhiro Hashiguchi

Mitsuhiro Hashiguchi 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).

  • High-stability dimmer
    Patent number: 9220144
    Abstract: A time-division control circuit individually controls an effective voltage supplied to each lighting load by adjusting the periods during which switching circuits connected to N sets of lighting loads are kept on. A zero-cross signal having a value that changes at the zero-cross point of the AC voltage is generated. An oscillation signal is generated with a frequency equal to, or an integer multiple of the AC frequency. The phase difference between the zero-cross signal and the oscillation signal is measured and a common reference point that defines the timing for turning the switching circuits ON or OFF is determined on the basis of the measured phase difference. An ON/OFF signal for each switching circuit is transmitted at a timing for each of the N sets of switching circuits on the basis of the reference point and the effective voltage to be supplied to the lighting load.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: December 22, 2015
    Assignee: ELM INC.
    Inventors: Takakazu Miyahara, Hiroshi Kirihara, Mitsuhiro Hashiguchi
  • HIGH-STABILITY DIMMER
    Publication number: 20150156842
    Abstract: A time-division control circuit individually controls an effective voltage supplied to each lighting load by adjusting the periods during which switching circuits connected to N sets of lighting loads are kept on. A zero-cross signal having a value that changes at the zero-cross point of the AC voltage is generated. An oscillation signal is generated with a frequency equal to, or an integer multiple of the AC frequency. The phase difference between the zero-cross signal and the oscillation signal is measured and a common reference point that defines the timing for turning the switching circuits ON or OFF is determined on the basis of the measured phase difference. An ON/OFF signal for each switching circuit is transmitted at a timing for each of the N sets of switching circuits on the basis of the reference point and the effective voltage to be supplied to the lighting load.
    Type: Application
    Filed: May 14, 2013
    Publication date: June 4, 2015
    Inventors: Takakazu Miyahara, Hiroshi Kirihara, Mitsuhiro Hashiguchi
  • High stability dimmer
    Patent number: 8618743
    Abstract: The present invention is aimed at providing a dimmer capable of preventing malfunctions due to noise contamination or waveform distortion of the voltage of an AC power source.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: December 31, 2013
    Assignee: ELM Inc.
    Inventors: Takakazu Miyahara, Hiroshi Kirihara, Mitsuhiro Hashiguchi
  • HIGH STABILITY DIMMER
    Publication number: 20130300301
    Abstract: The present invention is aimed at providing a dimmer capable of preventing malfunctions due to noise contamination or waveform distortion of the voltage of an AC power source.
    Type: Application
    Filed: November 16, 2011
    Publication date: November 14, 2013
    Inventors: Takakazu Miyahara, Hiroshi Kirihara, Mitsuhiro Hashiguchi