A method for making low profile microswitches, particularly usef

Details A method for making low profile microswitches, particularly usef A method for making low profile microswitches, particularly usef

1983-10-06

1988-09-06

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

29450, H01H 1106

Patent

active

047682841

ABSTRACT:
A keyboard unit is shown having a substrate in which portions of the substrate are physically displaced to provide a cavity, an embossment and a plurality of protuberances for each switching station. The embossment, in registry with a button contact area, projects upwardly from the floor of the cavity a selected distance with a discontinuous annulus contact area extending around its respective cavity in generally the same plane as that in which the top surface of the substrate lies. The cavity includes a channel shaped portion extending through the discontinued portion of the discontinuous annulus. The protuberances project upwardly from the general plane of the substrate's top surface and serve to laterally locate a snap-acting disc over the contact areas. The disc may be selectively coated with highly electrically conductive material to optimize electrical switching. A piece of flexible, electrically insulative sheet may be placed over the unit to seal it from the environment.

REFERENCES:
patent: 3458930 (1969-08-01), Melkeraaen et al.
patent: 3725907 (1973-04-01), Boulanger
patent: 3967084 (1976-06-01), Pounds
patent: 4074088 (1978-02-01), Keough et al.

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