| 摘要 |
PURPOSE:To keep the stable sensing pressure for a long period by pushing out an action rod piercing through a coil-shaped spring matter with an end of said spring matter, also pressing a contact member set at said tip end to a fixed contact member and separating both contact members from each other when the action rod is pushed inside. CONSTITUTION:An action rod 34 of a holder 14 for input pen of an electronic blackboard is put through a coil-shaped spring matter 29 having an end 30 fixed into a hole 31 of a terminal plate 22 with electrical insulation. The head part of the lever 34 touches the other end of the matter 29, and this touch degree is defined at a distance l by a flange. Ih this case, a mobile contact member 32 is pressed to a fixed contact member 19 by the spring power. When a pen top touches a blackboard, the holder 14 is pressed and the rod 34 moves inside by a distance l against the spring power. Thus the member 32 is separated from the member 19, and both members produce a slight slip by the touch/separation actions between them. Thus the contact surface is always polished.
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