Patents by Inventor Yukihiro Toyota

Yukihiro Toyota 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).

  • Reflective cholesteric filter
    Patent number: 6906764
    Abstract: A polarized light extraction optical element is formed by a light-transmitting base material and a polarization separation layer laminated thereonto, this polarization separation layer being a liquid crystal layer made of a cholesteric liquid crystal. The thickness of the liquid crystal layer is smaller than the thickness that would be required to achieve a maximum reflectivity, so that part of one of the right and left circularly polarized light components is reflected with a reflectivity smaller than the maximum reflectivity.
    Type: Grant
    Filed: October 23, 2002
    Date of Patent: June 14, 2005
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Keiji Kashima, Yukihiro Toyota, Masanori Umeya, Mariko Goto
  • Reflective cholesteric filter
    Publication number: 20030038918
    Abstract: A polarized light extraction optical element is formed by a light-transmitting base material and a polarization separation layer laminated thereonto, this polarization separation layer being a liquid crystal layer made of a cholesteric liquid crystal. The thickness of the liquid crystal layer is smaller than the thickness that would be required to achieve a maximum reflectivity, so that part of one of the right and left circularly polarized light components is reflected with a reflectivity smaller than the maximum reflectivity.
    Type: Application
    Filed: October 23, 2002
    Publication date: February 27, 2003
    Applicant: DAI NIPPON PRINTING CO., LTD.
    Inventors: Keiji Kashima, Yukihiro Toyota, Masanori Umeya, Mariko Goto
  • Polarized light extraction optical element
    Publication number: 20020113923
    Abstract: A polarized light extraction optical element is formed by a light-transmitting base material and a polarization separation layer laminated thereonto, this polarization separation layer being a liquid crystal layer made of a cholesteric liquid crystal. The thickness of the liquid crystal layer is smaller than the thickness that would be required to achieve a maximum reflectivity, so that part of one of the right and left circularly polarized light components is reflected with a reflectivity smaller than the maximum reflectivity.
    Type: Application
    Filed: April 4, 2002
    Publication date: August 22, 2002
    Inventors: Keiji Kashima, Yukihiro Toyota, Masanori Umeya, Mariko Goto