| 摘要 |
<p>The contact elements (6) of the keyboard system are dished and sprung and are made of conductive material. After deflection they snap-over into opposite position to come into contact with stationary contacts (2) on a support plate (1). When the pressure is relieved they snap automatically into their original position. The inside of the contact element dish has protruding lugs (11), spaced from the respective stationary contact in the starting position. The dished inside has a second protruding lug (12) whose distance from a conductive layer (3) is greater than that of the first lugs from the stationary contacts. On deflection of the contact element first the first lugs contact the stationary contacts, while the second lugs contact the conductive layer only after snap-over of the contact element.</p> |
