| 摘要 |
PURPOSE: A signboard for advertisement is provided to facilitate the change of advertisement contents and to prevent the inflow of moisture. CONSTITUTION: A printed circuit board(30) comprises a power supply circuit. The printed circuit board comprises a plurality of mounting hole units. A lighting-emitting unit(50) is installed in the mounting hole unit. The lighting-emitting unit irradiates light. A stopper unit(70) prevents moisture from flowing in the mounting hole unit. |
