Patents by Inventor Yukitoshi Hattori

Yukitoshi Hattori 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).

  • Planar lighting device and method of making light guides used therein
    Patent number: 6206535
    Abstract: A light guide member (2) includes a first light guide section (2A), which is a non-scattering light guide region, and a second light guide section (2B) which is a scattering light guide section and is made of material of the same composition as that of the first light guide section (2A), but mixed with scattering particles. Therefore, while the concentration of the scattering particles in the second light guide section (2A) is retained as high as possible, the gradient of the light scattering power can be increased to thereby allow a light exit surface to exhibit a high brightness and uniformity in luminance over the entire surface thereof. Also, the first light guide section (2A) and the second light guide section (2B) are formed by bonding them in the thicknesswise direction by the effect of a cohesive strength exhibited by material themselves therefore.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: March 27, 2001
    Assignee: Hayashi Telempu Co., Ltd.
    Inventors: Yukitoshi Hattori, Takeya Sakai, Masaya Morino, Hiroshi Nakayama