Pressure sensitive three-dimensional tablet and manipulation dat

Details Pressure sensitive three-dimensional tablet and manipulation dat Pressure sensitive three-dimensional tablet and manipulation dat

1997-03-25

1998-12-22

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1803, 178 1805, 345173, 345174, 345179, G08C 2100, G09G 500

Patent

active

058522603

ABSTRACT:
When a pair of opposed resistance sheets of a pressure sensitive 3D tablet are pressed into contact with each other by a tablet manipulation, an equal current is applied to a reference resistor R.sub.C, and the position of contact (x.sub.p,y.sub.p) between both sheets and a first potential difference V.sub.A, based on the resistance value r.sub.C of the reference resistor R.sub.C and a second potential difference based on the contact resistance r.sub.p at the contact position, are detected. Since the contact resistance r.sub.p can be detected by r.sub.P =r.sub.C *V.sub.B /V.sub.A, the X- and Y-coordinates (x.sub.p) and (y.sub.p) and the contact resistance r.sub.p at the position of contact between the resistance sheets can be detected as 3D independent parameters.

REFERENCES:
patent: 4794634 (1988-12-01), Torihata et al.
patent: 5008497 (1991-04-01), Asher
patent: 5369227 (1994-11-01), Stone

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