公开(公告)号：US20010050848A1

公开(公告)日：2001-12-13

申请号：US09871901

申请日：2001-06-04

Applicant: MINEBEA CO., LTD.

Inventor： Toshiaki Asakawa ,  Shigeyuki Adachi ,  Shinichi Niwa ,  Noboru Nishikawa

IPC: F21V008/00

CPC classification number: G02B6/0028 ,  G02B6/0038 ,  G02B6/005 ,  G02B6/0061

Abstract: A clear image can be achieved by preventing dusts from collecting in grooves formed in a transparent substrate and by improving contrast as well. A film is provided in such a manner as to cover a light reflection pattern formed in the surface of the transparent substrate. The film is sealingly fixed to the transparent substrate for preventing dusts from entering the light reflection pattern (particularly the grooves) during the process of assembling the spread illuminating apparatus. Also, the surface of the transparent substrate can be protected from scratches thanks to the film fixed. The amount of interface reflection can be reduced by using resin or the like as the film material, and contrast can be improved by setting the thickness of the film to a value smaller than prescribed.

Abstract translation: 可以通过防止灰尘聚集在形成在透明基板中的凹槽中并通过改善对比度来实现清晰的图像。 以覆盖在透明基板的表面上形成的光反射图案的方式设置膜。 在组装展开的照明装置的过程中，膜密封地固定到透明基板上，以防止灰尘进入光反射图案（特别是凹槽）。 此外，由于膜固定，可以保护透明基板的表面免受划痕。 通过使用树脂等作为膜材料可以减少界面反射量，并且可以通过将膜的厚度设定为小于规定值的值来提高对比度。