Keyboard switch
First Claim
1. In a keypad switch of the type including a key having shorting pucks on its underside and supported above exposed trace patterns on a printed circuit card by a flexible membrane whereby pressure on the key collapses the membrane and permits the shorting pucks to contact with the exposed trace patterns thereby closing the switch, the improvement wherein said shorting pucks include a central circuit puck electrically isolated from an annular puck thereabout, said annular puck being co-planar and concentric with said circular puck, and wherein said exposed trace patterns are formed in a circular region and an annular region co-planar and concentric with said circular region, exposed trace patterns in said circular region being electrically isolated from trace patterns in said annular region, said circular region and said annular region being correspondingly aligned with said circular puck and said annular puck.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved multiple circuit keypad switch of the type in which a rigid key having a shorting puck on its underside is supported over exposed traces of a printed circuit card by a flexible membrane so that the puck shorts designated exposed traces to close all circuits when the key is depressed, the improvement arising from the layout of the exposed traces in which individual circuits are arranged in concentric rings and the shorting puck contains shorting elements arranged in corresponding concentric rings.
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Citations
6 Claims
- 1. In a keypad switch of the type including a key having shorting pucks on its underside and supported above exposed trace patterns on a printed circuit card by a flexible membrane whereby pressure on the key collapses the membrane and permits the shorting pucks to contact with the exposed trace patterns thereby closing the switch, the improvement wherein said shorting pucks include a central circuit puck electrically isolated from an annular puck thereabout, said annular puck being co-planar and concentric with said circular puck, and wherein said exposed trace patterns are formed in a circular region and an annular region co-planar and concentric with said circular region, exposed trace patterns in said circular region being electrically isolated from trace patterns in said annular region, said circular region and said annular region being correspondingly aligned with said circular puck and said annular puck.
Specification