Electrographic apparatus

Details Electrographic apparatus Electrographic apparatus

1979-05-29

1981-09-15

Brown, Thomas W.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

042899257

ABSTRACT:
Electrographic apparatus includes a transducer pad having a flexible membrane mounted over a base member with facing surfaces of the membrane and base member being electrically conductive and having electrical voltages applied thereto whereby to provide electrical signals representing the coordinates of a location at which pressure is applied to the flexible membrane locally by a pen or stylus, wherein in order to maintain an appropriate tension in the flexible membrane, the membrane is attached to and mounted on an outwardly tensioned rectangular frame member. The frame member may comprise separate frame elements and spring members forcing the elements away from one another. Alternatively, the frame member may be resilient and be inwardly compressed during the attaching thereto of the flexible membrane whereby the inherent resilience of the frame member subsequently tensions the flexible membrane.

REFERENCES:
patent: 3522664 (1970-08-01), Lambright et al.
patent: 3735023 (1973-05-01), Hurst et al.
patent: 3959585 (1976-05-01), Mattes et al.
patent: 4070544 (1978-01-01), Lambden
patent: 4149029 (1979-04-01), Pobgee

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