Patents by Inventor Rika Ando

Rika Ando 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).

  • Lens array sheet, surface light source, and transmission type display device
    Patent number: 5841572
    Abstract: A lens array sheet according to the present invention, comprising a transparent substrate, a lens array having lens elements that are one-dimensionally or two-dimensionally formed on the front surface of the transparent substrate, and a cluster having a large number of cluster members randomly formed in a prism shape on the rear surface of the transparent substrate, each of the length, the width, and the height of each of the cluster members being in the range from the wave length of source light to 500 .mu.m. Thus, a lens array sheet that effectively uses light energy of the light source, maintains the light condensing effect, prevents the luminance from deteriorating, homogeneously distributes the luminance on the light emitting surface, prevents equal-thickness interference fringes and wasteful light dispersion to out of the angular range of visual angle can be provided. In addition, a surface light source having the lens array sheet is provided.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: November 24, 1998
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Rika Ando, Haruo Ono, Hisanori Ishida, Michiko Takeuchi, Toshikazu Nishio, Nobu Masubuchi
  • Lens array sheet surface light source, and transmission type display device
    Patent number: 5808784
    Abstract: A lens array sheet according to the present invention, comprising a transparent substrate, a lens array having lens elements that are one-dimensionally or two-dimensionally formed on the front surface of the transparent substrate, and a cluster having a large number of cluster members randomly formed in a prism shape on the rear surface of the transparent substrate, each of the length, the width, and the height of each of the cluster members being in the range from the wave length of source light to 500 .mu.m. Thus, a lens array sheet that effectively uses light energy of the light source, maintains the light condensing effect, prevents the luminance from deteriorating, homogeneously distributes the luminance on the light emitting surface, prevents equal-thickness interference fringes and wasteful light dispersion to out of the angular range of visual angle can be provided. In addition, a surface light source having the lens array sheet is provided.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: September 15, 1998
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Rika Ando, Haruo Ono, Hisanori Ishida, Michiko Takeuchi, Toshikazu Nishio, Nobu Masubuchi