Capacitively coupled tablet

Details Capacitively coupled tablet Capacitively coupled tablet

1978-05-23

1980-03-18

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

041940830

ABSTRACT:
A capacitively coupled tablet for use with a probe comprises two sets of conductors spaced apart along coordinate axes to form a matrix, and an overlay disposed above the conductors and forming a plurality of key segments associated with the individual points of intersection of the matrix. A plurality of isolated electrode plates are disposed between the sets of conductors and the overlay at positions corresponding to each of the key segments, the electrode plates each being formed of a conductive material and having a size commensurate with the key segment. When a probe is applied against a particular key segment from over the overlay, the probe is capacitively coupled with selected conductors of the respective sets through the electrode plates.

REFERENCES:
patent: 3567859 (1971-03-01), Ellis et al.
patent: 3585368 (1971-06-01), Nunamaker
patent: 3593319 (1971-07-01), Barber
patent: 3757322 (1973-09-01), Barkan et al.
patent: 3951250 (1976-04-01), Pointon et al.
patent: 3974332 (1976-08-01), Abe et al.

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