Manually activated position indicator

Details Manually activated position indicator Manually activated position indicator

1988-07-08

1989-10-10

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340709, 341 33, G08C 2100

Patent

active

048734004

ABSTRACT:
A manually activated position indicator with electrical output signals includes a plurality of adjacent electrodes (S, Al-, Al+, Bl-, Bl+, Ax-, Ax+, Bx-, Bx+,Ay-, Ay+, By-, By+), which are electrically insulated from one another and are covered on one side by an electrically insulating layer (3) the side of which opposite said electrodes is provided as a support surface for a finger (4) of the user of said position indicator wherein said electrodes form at least three groups, and all of the electrodes (S) of a first group are connected to a voltage source (5) that delivers an alternating voltage (Us). The electrodes of the other groups are connected to a signal evaluating circuit, and at least one electrode of said other groups is arranged adjacent to an electrode (S) of the first group.

REFERENCES:
patent: 4707573 (1987-11-01), Etherington et al.

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