Digitizer system with intertwined loopback conductor grid

Details Digitizer system with intertwined loopback conductor grid Digitizer system with intertwined loopback conductor grid

1988-02-12

1989-05-16

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

048312169

ABSTRACT:
In a digitizer system, a primary set of conductors is formed by looping spaced conductors in pairs through four quarter sections of a grid active area in such a way that the unexcited or directional polarities of each pair are different in each quarter section. A secondary set of conductors is formed by looping at least one additional conductor back and forth through the active area in the spaces between the conductor pairs of the primary set. A coil in a pen tip is movable relative to the grid, and used to inductively couple signals in the conductors of the grid. This intertwined conductor loopback arrangement permits coverage of relatively large grid active areas with a minimal number of multiplexers for switching the conductors to signal processing circuitry.

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

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