Aperture capacitor pickup

Details Aperture capacitor pickup Aperture capacitor pickup

1978-10-17

1980-03-18

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

041940849

ABSTRACT:
The location and shape of a region of capacitive coupling between two conductive surfaces is determined by a grounded shield interposed between the two surfaces. The shield has an aperture which limits and defines the region of capacitive coupling, between the two surfaces, for a signal referenced to the ground. This principle is applied to provide a transparent capacitive aperture pickup for a digitizer by laminating together pieces of glass having transparent conductive coatings.

REFERENCES:
patent: 3419769 (1968-12-01), Elnekave et al.
patent: 3727117 (1973-04-01), Robinson
patent: 3876831 (1975-04-01), Wickham et al.

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