Keyboard apparatus and method for making same

Details Keyboard apparatus and method for making same Keyboard apparatus and method for making same

1981-12-28

1987-10-13

Recla, Henry J.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 29622, H01R 900

Patent

active

047000325

ABSTRACT:
A keyboard is assembled by providing first and second electrically conductive strips of layers and first and second electrically insulative strips of layers, forming the layers into a desired configuration and laminating them together with the respective insulative layers intemediate and on top of the conductive layers. Switching areas are delineated on at least one of the conductive layers and are joined to each other and are provided with output leads by conductive paths configured from the conductive layer. The interposed insulative layer is formed with a plurality of apertures located so that an aperture can be aligned with each switching area. After the layers are laminated together they are blanked out from the strips and holes are punched out through the four layers to sever selected conductive paths and form a preselected circuit pattern.

REFERENCES:
patent: 1794831 (1931-03-01), Caruso
patent: 3237282 (1966-03-01), Reith
patent: 3697711 (1972-10-01), Tetrick
patent: 3742157 (1973-06-01), Leposavic
patent: 3950846 (1976-04-01), Johnson
patent: 4158115 (1979-06-01), Parkinson et al.
patent: 4258096 (1981-03-01), LaMarche

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