Pressure sensitive resistor cell

Details Pressure sensitive resistor cell Pressure sensitive resistor cell

1996-02-06

1998-12-29

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1801, 178 1803, 345173, 345174, G08C 2100, G09G 500

Patent

active

058544518

ABSTRACT:
A simple-structured pressure sensitive resistor cell which is free from the influence of contact resistance when performing coordinate detection, and which permits reduction of power consumption. In a waiting state, a logic circuit makes a primary detection that a resistor plate is being pressed, and then an A/D converter is started. When the contact resistance becomes negligibly small, a secondary detection of the stylus pressure is made by the A/D converter. The A/D converter is held OFF while the cell is in the waiting state, so that power consumption is reduced, and the waiting state can be changed to a coordinate detecting mode after the contact resistance becomes so low as not to affect the coordinate detection.

REFERENCES:
patent: 4821029 (1989-04-01), Logan et al.
patent: 5313051 (1994-05-01), Brigida et al.
patent: 5451724 (1995-09-01), Nakazawa et al.
patent: 5453941 (1995-09-01), Yoshikawa
patent: 5455574 (1995-10-01), Itaya et al.
patent: 5518078 (1996-05-01), Tsujioka et al.

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