Patent ID: 6504492
Filing Date: 2003-01-07
Classification: H01H,H03M

Abstract:
A keypad arrangement for providing electrical information to an electronic device in response to a manual pressing action of a user, comprising:a number of depressable keys within a certain keypad area; an arrangement of essentially continuous conducting means next to the depressable keys, the arrangement comprising a first elongated strip with a first specific resistance and a second elongated strip with a parallel non-touching second specific resistance covering a planar surface adjacent to the depressable keys; a connection creating means associated with each depressable key, the connection creating means comprising a conductive part associated with each key and supported in the vicinity of the first elongated strip and the second elongated strip so that a depression of a key is arranged to cause the corresponding conductive part to press against at least one part of said first elongated strip and said second elongated strip, the connection creating means providing, as a response to the depression of a key, an electrical connection through the essentially continuous conducting means so that the electrical characteristics of the created electrical connection uniquely identify the location of the depressed key in relation to the essentially continuous conducting means; and a supply voltage connection to said first enlongated strip and an output voltage connection from said second elongated strip.