Tablet digitizer with untethered stylus

Details Tablet digitizer with untethered stylus Tablet digitizer with untethered stylus

1991-01-14

1991-12-10

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 20, 310319, 310339, G08C 2100

Patent

active

050720767

ABSTRACT:
A Prior Art current digitizer which uses a resistive film and a stylus connected to a current source for locating a stylus by current measurement. A preferred embodiment of a voltage digitizer design which uses a polyvinylidene difluoride (KYNAR) film coated with a conductive resistive coating so that the transient voltage between the coating on the upper and lower surfaces of the PVDF piezoelectric film can be measured. A resistive element forming a voltage divider is provided between resistance films leads at each corner with the film resistance.

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