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A capacitive keyboard is assembled with flat base plates and pivot plates to facilitate automatic assembly thereof.
English (United States)
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100% of the total text.
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Automatic Keyboard Assembly Technique
A capacitive keyboard is assembled with flat base plates and pivot plates to
facilitate automatic assembly thereof.
The keyboard assembly 11 includes a housing 13, keybuttons 15 and pivot
plates 17. A buckling spring 19 is caused to deflect upon keybutton depression,
causing its associated pivot plate 17 to pivot to a position adjacent a flat circuit
board 21. Motion of the pivot plate 17 changes the sensed capacitance on the
circuit board 21.
In order to facilitate automatic assembly of the keyboard, the pivot plates 17
for the entire keyboard are on a one-piece molding. After the spring is assembled
to each pivot plate, the multiple pivot plates are sheared from the screw and then
pushed into the preassembled keybuttons and base with one stroke of a press.
The board 21 is thereafter placed onto the assembly 11 in order to complete it.
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