| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection device which functions as a blackboard and a whiteboard by making it possible to write and erase board written items without lowering the sharpness of a sheet with an original drawing. SOLUTION: The projection device projects on a screen, etc., an image of characters, a pattern, etc., drawn on a translucent sheet such as an OHP sheet placed on a stage. The original sheet where the image is already drawn and a sheet for writing which transmits the image while placed on the original sheet and makes it possible to write the image later are put one over the other with the writing sheet above and held on the stage by a holding means.
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