Patents by Inventor Rinichiro Yamamoto

Rinichiro Yamamoto 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).

  • Spectrum measuring equipment utilizing double-image polarizing element
    Patent number: 5080486
    Abstract: In spectrum measuring equipment the light to be measured is separated by a double-image polarizing element into two polarized wave components whose planes of polarization cross each other perpendicular and which have different optical axes. The two polarized wave components are applied to a dispersing element so that their planes of polarization intersect the direction of light separation at .+-.45.degree. thereto, respectively. The sum of optical powers of the two polarized wave components separated by the dispersing element is measured by a photodetector, so that spectrum measurement independent of the polarization of the light to be measured can be achieved.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: January 14, 1992
    Assignees: Fujitsu Limited, Advantest Corporation
    Inventors: Masataka Shirasaki, Hirochika Nakajima, Yukimitsu Watanabe, Rinichiro Yamamoto