Patents by Inventor Hiroshi Takikawa

Hiroshi Takikawa 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).

  • Light illumination device
    Patent number: 7728346
    Abstract: An LED illumination device can include a bridge connection circuit that includes five LED chips. The LED chips can be installed such that four LED chips, through which half-wave rectified current flows, are disposed in a generally cross-shaped opposed arrangement with the remaining LED chip interposed therebetween. The remaining LED chip can also have a full-wave rectified current flowing therethrough. Half-wave rectified currents having phases shifted by 180° (half the period) can flow through respective LED chips installed at a generally right angle. The placement range for the five LED chips can be limited, and the LED chips can be sealed with a wavelength conversion material.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: June 1, 2010
    Assignee: Stanley Electric Co., Ltd.
    Inventor: Hiroshi Takikawa
  • LIGHT ILLUMINATION DEVICE
    Publication number: 20070103899
    Abstract: An LED illumination device can include a bridge connection circuit that includes five LED chips. The LED chips can be installed such that four LED chips, through which half-wave rectified current flows, are disposed in a generally cross-shaped opposed arrangement with the remaining LED chip interposed therebetween. The remaining LED chip can also have a full-wave rectified current flowing therethrough. Half-wave rectified currents having phases shifted by 180° (half the period) can flow through respective LED chips installed at a generally right angle. The placement range for the five LED chips can be limited, and the LED chips can be sealed with a wavelength conversion material.
    Type: Application
    Filed: October 30, 2006
    Publication date: May 10, 2007
    Inventor: HIROSHI TAKIKAWA