Telegraphy – Systems – Position coordinate determination for writing
Patent
1987-03-20
1988-11-22
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
178 19, 338 2, G08C 2100
Patent
active
047867647
ABSTRACT:
A stylus switch is activated automatically when the tip of the stylus is pressed against a digitizer tablet with sufficient force. The pressure switch includes a transducer in the form of an ink layer having electrical resistance which varies as a function of the pressure applied thereon. Electrodes of conductive ink contact the ink layer of the transducer, providing a circuit element including a variable resistance. The current which flows between the two conductive ink electrodes varies as a function of the force with which the stylus tip is pressed against the data tablet, thus providing an analog output which can be detected as a function of pressure or which can be detected to determine when the pressing force exceeds a predetermined value. Processing of the data representing the coordinates of the stylus tip is enabled only when the tip is being pressed with at least a predetermined force, i.e. the amount of force applied by a stylus user during writing. The ink layers of the electrodes and transducer, as well as the stylus anode, are applied on a single piece of flexible plastic film which is wrapped around a central assembly and inside a coaxial barrel. A collapsible dome of metal is arranged to provide tactile feedback to the user when the predetermined force is obtained.
REFERENCES:
patent: 3528295 (1970-09-01), Johnson et al.
patent: 4311980 (1982-01-01), Prudenziati
patent: 4492819 (1985-01-01), Rodgers et al.
patent: 4532376 (1985-07-01), Rockwell
Matthews Henry G.
Padula Michael J.
Schreyer Stafford D.
Summagraphics Corporation
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