Tracer for electrographic surfaces

Details Tracer for electrographic surfaces Tracer for electrographic surfaces

1986-10-22

1987-11-17

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

047075724

ABSTRACT:
An improved tracer for use with electrographic surfaces which employs reticle components including crosshairs and a sighting circle which additionally functions to provide capacitive coupling. Formed of a conductive material such as chromium, these components are geometric regular shape and somewhat concentrated at the center portion of the reticle targeting center. As such, the device is capable of achieving a close correspondence between actual physical targeting location and resultant digitized coordinate readout. These components further achieve an avoidance of inaccuracies due to active surface border influences. The reticle-capacitive coupling components are placed on one side of a transparent disk, the opposite or upwardly disposed surface of which is coated with a transparent electrically conductive material such as indium tin oxide. This upwardly disposed conductive layer is coupled with ground and there results a dissipation of spurious signals which otherwise may influence the performance of the device.

REFERENCES:
patent: 4194084 (1980-03-01), Hetzel
patent: 4600807 (1986-07-01), Kable
patent: 4639547 (1987-01-01), Jacob-Grinschgl

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