| 摘要 |
<p>PURPOSE:To detect an input/partial erasing mode easily and to make its operation easy by detecting the existence of conduction between electrode groups in the 1st electrode divided into two groups to discriminate the partial erasing mode. CONSTITUTION:The 1st and 2nd electrode groups 2, 3 and a partial erasing mode detecting circuit 4 are formed on an input part 1 of an electronic blackboard device and input information is displayed on a television monitor 12 through a transmission part 5, a transmission line 10 and a receiving part 11 in the electronic blackboard device. Respective electrodes in the 1st electrode group 2 are alternately connected in common, the even-order electrodes are connected to a terminal 6 as the 1st electrode group and the odd-order electrodes are connected to a terminal as the 2nd electrode group. If a substance such as a blackboard eraser having a large contact surface is used for an input pressure source applied to the input part 1, these electrodes are contacted at plural positions simultaneously. A detecting circuit 4 detects the conduction between the terminals 6 and 7, and at the conduction informs the partial erasing mode to a transmission part 5.</p> |
