Patents by Inventor Kei HANZAWA

Kei HANZAWA 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).

  • Illumination device, display apparatus, and timepiece
    Patent number: 9523960
    Abstract: There is provided an illumination device including: a light guide plate in which a light diffusion pattern of diffusing incident light is formed to have density that is coarse on one side and gets denser toward the other side; a first light source which is provided on a side corresponding to the one side of the light diffusion pattern in the light guide plate; and a second light source which is provided on a side corresponding to the other side of the light diffusion pattern in the light guide plate.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: December 20, 2016
    Assignee: CASIO COMPUTER CO., LTD.
    Inventors: Kei Hanzawa, Eiji Yamakawa
  • ILLUMINATION DEVICE, DISPLAY APPARATUS, AND TIMEPIECE
    Publication number: 20150009783
    Abstract: There is provided an illumination device including: a light guide plate in which a light diffusion pattern of diffusing incident light is formed to have density that is coarse on one side and gets denser toward the other side; a first light source which is provided on a side corresponding to the one side of the light diffusion pattern in the light guide plate; and a second light source which is provided on a side corresponding to the other side of the light diffusion pattern in the light guide plate.
    Type: Application
    Filed: July 3, 2014
    Publication date: January 8, 2015
    Inventors: Kei HANZAWA, Eiji YAMAKAWA