| 摘要 |
PURPOSE:To simplify the constitution, to reduce the manufacture cost and to stabilize the operation by providing a couple of switching electrodes parted and opposed to each other on the way of the 2nd lead pattern and arranging a movable electrode so as to be cpmmected and disconnected to a couple of the switching electrodes. CONSTITUTION:The keyboard switch consists of thc lst and 2nd fixed electrodes 6,8, the lst and 2nd lead patterns 7,9, an insulation film 5 provided with a couple of switching electrodes 10,11 and the moving electrode 4 connected and disconnected to/from a couple of switching electrodes 10,11 while being fitted to a rubber spring 3. In depressing the key l, the rubber spring 3 is depressed and the moving electrode 4 is moved downward. In depressing the key 1 further, a cone part is buckled to conduct both the electrodes 10,11. Then an AC signal based on the capacitance formed by the lst fixed electrode 6, the insulation film 5 and the 2nd fixed electrode 8 is sent between the lst and 2nd lead patterns 7,9.
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