Keypads and key switches

H - Electricity – 01 – H

Patent

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Details

H01H 13/70 (2006.01) H01H 13/702 (2006.01)

Patent

CA 2479052

A keypad with both elevated (11) and non-elevated (22) key regions, and key switches (12) disposed beneath both types of key regions. The non-elevated key regions each provide corresponding character output based on an operation algorithm that considers activation of at least one adjacent elevated key region as well as activation of the switch below the non-elevated key region. The keypad includes a keymat (41) that is rigidly held at its perimeter in a stretched condition across a switch substrate (23). The key switches include metal snap domes (12) that have an elevated central region (212) forming a downwardly facing cavity (13) defined at its edge by a ridge (214) disposed above the switch contacts (21) that electrically engages multiple switch contacts in an annular contact zone (230).

L'invention concerne un bloc numérique à zones de clés soulevées (11) et non soulevées (22), et des commutateurs à clé (12) disposés au-dessous des deux types de zones de clés. Les zones de clés non soulevées fournissent chacune une sortie de caractère correspondant, basé sur un algorithme d'opération qui prend en compte l'activation d'au moins une zone de clés soulevées adjacente, ainsi que l'activation du commutateur au-dessous de la zone de clés non soulevée. Le bloc numérique comprend une matrice de clés (41) maintenue rigide sur son périmètre, à l'état tendu, au travers d'un substrat de commutateurs (23). Les commutateurs à clés comprennent des dômes métalliques à saut brusque (12) présentant une zone centrale soulevée (212) formant une cavité (13) orientée vers le bas, dont le bord détermine une moulure (214) disposée au-dessus des contacts des commutateurs (21), coopérant électriquement avec de multiples contacts de commutateurs dans une zone de contact annulaire (230).

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