| 摘要 |
The invention relates to a momentary-contact switch device having a plurality of momentary-contact switches which are grouped to form a key panel and act by means of their operating elements on a contact mat (2) which has linear-movement bellows (1) and elastic properties. Each linear-movement bellows (1) carries in its interior a contact pimple (3) which, when the key is pressed down, suddenly bridges over contact points (5, 6) which are arranged on an insulating board. The object of the invention is to increase the number of switching circuits. This is achieved in that a contact film (4) which is provided with conductor tracks and contact points (5, 6) applied on both sides is arranged underneath the contact mat (2). Arranged underneath the contact film (4) is a rigid printed-circuit board (7) which is isolated from the contact film (4) by means of an intermediate film (8). In the region of the contact points (5, 6, 9), the intermediate film (8) has recesses (14). If required, outside the contact points (5, 6, 9), the printed-circuit board (7) is provided with conductor tracks (10, 11) on both sides, and is used for holding electrical components (13). It can be used in information technology keyboards (Fig.). <IMAGE>
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