| 摘要 |
PROBLEM TO BE SOLVED: To reduce manufacturing cost, simplify handling and manufacture and produce a light display surface of a large luminance value and uniform luminance. SOLUTION: A bar-shaped light guide 5, 18, 19, and a high diffusion and high reflection means 3 applied to an illumination chamber 7 are used. The bar-shaped light guide 5, 18, 19 and the high diffusion and high reflection means 3 in the illumination chamber 7 have a short molding cycle and the usage of a light guiding material can be small, so that manufacturing cost is reduced. The bar-shaped light guide 5, 18, 19 and the high diffusion and high reflection means 3 in the illumination chamber 7 have a light weight, so that handling and manufacture are simplified. Light passing in the illumination chamber 7 is highly diffused and highly reflected by the high diffusion and high reflection means 3, so that an absorption factor of light passing in the illumination chamber 7 made smaller than an absorption factor of light passing in the thick-walled light guide can produce a light display surface of a large luminance value and uniform luminance. |
