Graphical input apparatus for electrical equipment

Details Graphical input apparatus for electrical equipment Graphical input apparatus for electrical equipment

1976-10-14

1978-03-21

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

178 19, G08C 2100

Patent

active

040805140

ABSTRACT:
Two improvements are disclosed for a known graphical input tablet employing a resistive sheet stretched across, but spaced from, a resistive member, wherein the co-ordinates of a point are indicated by pressing the sheet into contact with the member at the point: firstly the resolution of the tablet is increased by the addition of conducting strips dividing the sheet and/or the member into regions, and a circuit for indicating in which region the contact occurs; and secondly by the addition of a circuit for indicating when two such contacts are made at the same time.

REFERENCES:
patent: 3633180 (1972-01-01), Pabst
patent: 3885097 (1975-05-01), Pobgee
patent: 3921165 (1975-11-01), Dym

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