Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1998-10-27
2000-10-24
Horabik, Michael
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 34, 345173, 345174, H03K 1794
Patent
active
06137427&
ABSTRACT:
A touchpad is formed of an electrically insulating membrane (10) with a first series of spaced apart conductors (12) on a first face of membrane (10) and a second series of spaced apart conductors (14) on or proximal thereto, in which there is no electrical contact between the first and second series of conductors (12, 14) Each conductor in the first and second series of conductors is sensitive to the proximity of a finger to modify the capacitance of the proximate conductor to detect the presence of the finger positioned close to that conductor. A scanning system operative to sample one of the conductors in turn from both the first and second series of conductors (12, 14) in order to measure and store a capacitance value associated with that respective conductor. The scanning system is operative to maintain all conductors (12-n, 14-n) at a common potential equal to the potential of the conductor being sampled when the remaining conductors are not actively being sampled by the scanning system.
REFERENCES:
patent: 4686332 (1987-08-01), Greanias et al.
patent: 5459463 (1995-10-01), Gruaz et al.
Edwards, Jr. Timothy
Horabik Michael
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