Patents by Inventor Fumio Nishitani

Fumio Nishitani 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 adjusting sheet for a planar lighting device and a planar lighting device and a liquid crystal display using the sheet
    Patent number: 5764315
    Abstract: A light adjusting sheet for a planar lighting device includes a plurality of convex and concave ridges or regions arranged alternately and approximately parallel to each other on one surface. Each of the convex regions and concave regions are formed by two flat surfaces. The ridges may have a cross section of a sine curve. Another light adjusting sheet consists of a plurality of single sheets each having the above configuration, stacked together. A planar lighting device includes the light adjusting sheet of the above configuration, wherein peak lines of the convex ridges and bottom lines of the concave ridges are arranged to make a predetermined angle with an axis of a linear light source. The liquid crystal display includes a liquid crystal display element placed on front of the planar lighting device of the above configuration.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: June 9, 1998
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Tomohiro Yokota, Fumio Nishitani, Hiroshi Ogawara, Akihito Kubo, Makoto Fujigami
  • Light adjusting sheet having a sinusoidal surface and a non-optically flat surface and useable with an LCD
    Patent number: 5552907
    Abstract: A light adjusting sheet for a planar lighting device includes a plurality of convex and concave streaks arranged alternately and approximately parallel to each other on one surface. The streaks may have a cross section of a sine curve. Another light adjusting sheet consists of a plurality of single sheets each having the above configulation, stacked together. A planar lighting device includes the light adjusting sheet of the above configulation, wherein peak lines of the convex streaks and bottom lines of the concave streaks are arranged to make a predetermined angle with an axis of a linear light source. The liquid crystal display includes a liquid crystal display element placed on front of the planar lighting device of the above configulation.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: September 3, 1996
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Tomohiro Yokota, Fumio Nishitani, Hiroshi Ogawara, Akihito Kubo, Makoto Fujigami
  • Liquid crystal display using a plurality of light adjusting sheets angled at 5 degrees or more
    Patent number: 5394255
    Abstract: A light adjusting sheet for a planar lighting device includes a plurality of convex and concave streaks arranged alternately and approximately parallel to each other on one surface. The streaks may have a cross section of a sine curve. Another light adjusting sheet consists of a plurality of single sheets each having the above configulation, stacked together. A planar lighting device includes the light adjusting sheet of the above configulation, wherein peak lines of the convex streaks and bottom lines of the concave streaks are arranged to make a predetermined angle with an axis of a linear light source. The liquid crystal display includes a liquid crystal display element placed on front of the planar lighting device of the above configulation.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: February 28, 1995
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Tomohiro Yokota, Fumio Nishitani, Hiroshi Ogawara, Akihito Kubo, Makoto Fujigami