| 摘要 |
PURPOSE: A writing board is provided to not reflect the light of indoor of sunlight to the front on surface of the writing plate if lit the light source of indoor, thereby letters does not be seen dually. CONSTITUTION: A writing board includes a writing board(110), a diffuse sheet(120), a light guiding plate(140), a supporting plate(160), a light source(150), a side frame(170). The writing board is positioned in front, and is comprised of glass or transparency pad. The diffuse sheet is positioned on rear surface of the writing plate. The light guiding plate is positioned on diffusion sheet. The supporting plate is positioned on rear surface of the light guiding plate. The light source has a plurality of LED elements(152) and circuit substrates(154) which emits light by power supply from side edge. The side frame fix-supports a wiring board, a diffuse sheet, a light guiding plate, a supporting plate into one by covering them.
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