| 摘要 |
Keypad for telephone sets with a frame (1) holding the keys (3), a contact mat (4), made of elastic material, with lifting bellows (5) allocated to the keys (3) which act with contact parts (9) on contact paths of a printed circuit board (8) designed as contact elements (7). A keypad of the aforementioned type is to be produced which can be manufactured simply and cheaply. For this purpose, the contact parts (9) disposed in the lifting bellows (5) are made of a carbon-type material and the contact elements (7) are designed in the form of pins or bands with at least one end pressed through the printed circuit board (8). The printed circuit board (8) has conductor paths only on its side facing away from the keys (3), to which paths the contact elements (7) are electrically connected. A keypad designed in this way can be manufactured economically and is used in dialling keypads for telephone sets. <IMAGE>
|
