H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/1, 340/187,
H05K 1/02 (2006.01) H01H 9/14 (2006.01) H01H 13/70 (2006.01)
Patent
CA 1200320
Abstract of The Disclosure An improved planar contact array switch having reduced susceptibility to electrostatic discharge includes a printed circuit board which carries at least one switch contact foil pair. Sandwiched between the circuit board and an insulative overlay is a dome-shaped disc which, when depressed, completes an electrical circuit between the switch contact foil pair. Bordering the periphery of the printed circuit board so as to bound the area occupied by each of the switch contact foil pair is a ground foil which advantageously is provided with at least one inwardly ex- tending charge conductive foil which runs adjacent to each of the switch contact foil pairs for conducting any electro- static discharge which penetrates the overlay within the area bordered by the ground foil. To facilitate the conduc- tion of electrostatic discharges to the perimeter ground foil through the charge conductive foil, a spark gap is provided between each of the switch contact foil pairs and the charge conductive foil so that an electrostatic dis- charge may jump the spark gap and be conducted via the charge conductive foil on the ground plane to circuit ground.
449229
Allen-Bradley Company Inc.
Fetherstonhaugh & Co.
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