| 摘要 |
PROBLEM TO BE SOLVED: To obtain light availability equivalent to it without sticking a reflection tape, etc., to a side surface of a light guide body by making the opposite side surface of the light receiving surface of light transmission body making one side surface of plate material made of synthetic resin specified with crisscross lengths and thickness the light receiving surface, and making one side plane part a light emission surface translucent coarse surface. SOLUTION: The planar light guide body 1 consisting of the plate material made of the synthetic resin such as polycarbonate, acrylic resin, etc., of the crisscross lengths of 7-70 mm together, and of the thickness of 0.5-2.0 mm is arranged making its one side surface the light receiving surface 1a, and making one side plane part the light emission surface and opposing the light emission surface to a rear surface of a liquid crystal display panel. Then, a point light source 2 such as a light emitting diode, etc., irradiates light on the light receiving surface 1a. At this time, the side surface 1c of the opposite side of the light receiving surface 1a is made the translucent coarse surface consisting of minute ruggedness, and a difference A between heights of its recessed part and its projected part is made 1-20 μm on average, and a pitch B between adjacent recessed parts (or projected parts) is made 10-300 μm on average, and a B/A is made within the range of 5-100. |
