Pressure sensitive coordinate input device with improved voltage

Details Pressure sensitive coordinate input device with improved voltage Pressure sensitive coordinate input device with improved voltage

1992-05-14

1994-06-28

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 20, G08C 2100

Patent

active

053248953

ABSTRACT:
The invention provides a coordinates input device capable of detecting coordinates with high accuracy by eliminating errors that could be contained in detected voltage depending on the condition of the pressure applied to a coordinates input section. When pressure is applied to a plane resistive sheet of the coordinates input section, the maximum voltage applied to the coordinates input section is detected by means of an A/D converter prior to the detection of the coordinates, and correction is made by a reference voltage regulating circuit so that a reference voltage becomes equal to the maximum voltage. Thereafter, the A/D converter converts the detected voltage to digital data on the basis of the corrected reference voltage, for calculation of the coordinates. Errors that could be contained in the detected voltage when detecting the coordinates can thus be eliminated.

REFERENCES:
patent: 3885097 (1975-05-01), Pobgee
patent: 4386232 (1983-05-01), Slater
patent: 5008497 (1991-04-01), Asher

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