| 摘要 |
PROBLEM TO BE SOLVED: To automatically perform page ejection for an electronic blackboard provided with an endless sheet 3 and an image sensor 7 without providing a photosensor used exclusively for page ejection. SOLUTION: Page marks 12 are provided on a face of the endless sheet 3, and the image sensor 7 for reading characters and figures drawn on the endless sheet 3 is used combinedly for reading the page marks 12.
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