| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss caused by diffusion and reflection and to emit light having high luminance in uniform distribution by forming plural projecting parts for totally reflecting light made incident from an incident end face part to a surface part side on a rear surface part. SOLUTION: This light transmission plate 12 is provided with the surface part 15 from which the light is emitted, the rear surface part 21 positioned on an opposite side to the part 15, and the incident end face part 13 which is positioned on one end side of the parts 15 and 21 and connected to the parts 15 and 21, and also to which the light from a light source lamp 14 is introduced. In the plate 12, the light made incident from the part 13 is emitted from the part 15. A recessed surface and a projecting surface deflecting the light emitted from the part 15 in a specified direction are wavily formed on the part 15, and plural projecting parts 23 respectively having an inclined surface for totally reflecting the light made incident from the part 13 toward the part 15 side are formed on the part 21. |
