| 摘要 |
<p>PURPOSE:To use both sides of an electronic blackboard, by arranging rotatably the blackboard and returning a detecting signal from a control circuit to the control circuit only when one side is used, to detect the using side of the board. CONSTITUTION:The board B is set up rotatably on an unshown supporting board by an axis AX and connectors CN1, CN2 are fitted to both the upper and lower ends. These connectors CN1, CN2 are selectively connected to a connector CN connected to a control circuit CONT. Two terminals of the connector CN2 are shorted to return a detecting signal from the control circuit CONT. The control circuit CONT detects whether the using side is B1 or B2 according to the presence of the return of the detecting signal. When the side B2 is in using, the Y coordinate is converted by YA=YL-YC. (where YA=real Y coordinate, YL=the whole length in the Y direction, YC=Y coordinate from a sensor). Consequently, transmission of the coordinate to the opposite by using both sides, CRT display and storage in a floppy disc can be precisely performed.</p> |
