| 摘要 |
PURPOSE:To enable reading a document and writing a memo even when an overhead projector (OHP) is used without bothering other attendants by linedly providing a transparent plate on an illuminating window of a board to irradiate the transparent plate with a lower side light source. CONSTITUTION:A transparent plate 15 is linedly provided on an illuminating window 14 of a board 1, and a document or a sheet, placed on the transparent plate 15, is illuminated from the lower side with a light source 2, provided in the lower part, to enable reading the document and writing a memo on a sheet in a dark condition when an OHP is used. Moreover the light-source light is reduced in its brightness with the document or the sheet, and has no effect on a light source of the OHP, unbothering to OHP attendants. |
