| 摘要 |
PROBLEM TO BE SOLVED: To increase a ratio of light emitted toward a direction vertical to a light-emitting surface in making the light be emitted from the light-emitting surface in a light transmission plate comprising a translucent plate material and to make the light transmission plate be easily manufactured. SOLUTION: In the light transmission plate using the translucent plate material 11, a projecting part 12 comprising a translucent material different from the translucent plate material is arranged on the light-emitting surface 11a to emit the light and also the projecting part is formed on the light-emitting surface with printing. |
