| 摘要 |
A light conductive bar has a plurality of flat portions parallel to a side surface thereof facing a light conductive plate and formed on a side surface thereof opposite to the side surface and a plurality of inclined surfaces descending from one end surface facing a spot-like light source toward the other end surface, wherein the flat portions step down gradually from the one end surface to the other end surface. When light introduced into the light conductive bar from the one end surface is repeatedly reflected at the flat portions and the side surface facing the light conductive plate, angles of reflections thereat can stay larger than the critical angle because the flat portions are parallel to the side surface. Accordingly, the light can travel to the other end surface without leakage, thereby improving the luminance of the apparatus.
|
