| 摘要 |
PROBLEM TO BE SOLVED: To enhance the surface luminance of a light guide plate at minimum cost. SOLUTION: This illuminates is equipped with a light guide plate 1 which has a diffuse reflection part 2 on its reverse surface side and a light projection part on its top surface side, a lamp 3 as a linear light source which faces the end surface of the light guide late 1, and a reflecting plate 4 which surrounds the lamp 3 and directs reflected light to the said end surface of the light guide plate 1. The end surface of the light guide plate 1 which faces the lamp 3 is formed into an uneven surface 5 where projections which are sectioned triangularly along the length of the lamp 3 are arrayed. When the surface facing the lamp 3 is flat, light which is not made incident on the light guide plate 1 because of total reflection can be made incident. |
