Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1991-08-29
1992-09-22
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200314, 200512, H01H 1370
Patent
active
051499231
ABSTRACT:
Disclosed is a keypad for use with compact and portable cellular telephone systems in which each key is backlit. A partially translucent overlay layer of flexible material includes a raised key. Under the key, in a preferred embodiment, is an actuation layer, which, during operation, is depressed downward by the key. Below the actuation layer, is a tactile feedback layer including a dome for each key, in which, after being depressed to a predetermined degree, the dome inverts causing a conductor located below the dome to short conductive traces on a substrate upon which the keypad is mounted. In a preferred embodiment, the keys are backlit by a light source extending through the substrate upon which the keypad is mounted. The tactile feedback layer includes a structure for reducing pressure on the light source when the tactile layer is in the inverted condition, resulting in a thinner keypad with a brighter backlit key and a longer life light source.
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Lucas Duralith Corporation
Scott J. R.
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