| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to avert the occurrence of unequal luminance and to effectively utilize an exit surface even when a reflector, etc., are held on a light transmission plate by double coated adhesive tapes by arranging a light shielding member for shielding illumination light at the end face of a member to be held on the exit surface or slope of the light transmission plate. SOLUTION: Even if the bright line by the edge E of the light scattering light transmission body 11 and the dark band by an incident surface 12 are obscured by shielding the edge E and forming the incident surface 12 as a rough surface, unequal luminance arises in exit light when the double coated adhesive taps 15 and 18 are stuck to the light scattering light transmission body 11 and are held at the slope and the exit surface and the reflector 19 is held on the exit surface. The illumination light leaking from the end face is, therefore, shielded by the double coated adhesive taps 15 and 18 and the light shielding member 17 arrange at the end face of a reflector 19. The bright glittering of the double coated adhesive taps 15 and 18 and the end face of the reflector 19 by incoming light, etc., is obviated. As a result, the occurrence of the brightline is effectively averted and the unequal luminance is decreased. |
