| 摘要 |
<p>A key switch consisting of a switch mounted on a circuit board. The switch has at least three contact elements mounted on a plunger which is normally biased away from the circuit board. When pressure is applied to a key mounted on the side of the plunger opposite the contacts, the contact elements are lowered into engagement with corresponding contact points on the circuit board permitting a coded output to be generated. If one of the contact points on the board is a common point and the contact element on the plunger adapted to engage the common point is recessed, a simple and effective means is provided for preventing spurious outputs from the switch.</p> |
