Membrane keyboard for songbook tone generator

Details Membrane keyboard for songbook tone generator Membrane keyboard for songbook tone generator

1986-02-05

1987-11-17

Witkowski, Stanley J.

Music

Instruments

84423R, 84433, 84471R, 84483R, 84DIG7, 200 5A, G10H 134, G10H 500

Patent

active

047065362

ABSTRACT:
A membrane keyboard for e.g. a low cost electronic tone generator of the type affixed to the binding of a songbook is disclosed. The keyboard includes a base carrying a set of interdigital upwardly facing printed circuit contacts for each key. A membrane overlay is vacuum formed of a thin plastic sheet to define a horizontal row of playing keys, each key being formed as a plateau area, with a vertical depression spring rib separating each key. Each key includes an elastomeric foam pad affixed to its underside area which carries a conductive lower surface aligned with with the interdigital traces of the key. The conductive surface bridges the traces to complete an electrical circuit when the membrane is depressed downwardly from its top surface.

REFERENCES:
patent: 3592098 (1971-07-01), Zadig
patent: 4276538 (1981-06-01), Eventoff et al.
patent: 4366463 (1982-12-01), Barker

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