Multiplexer for a piezo ceramic identification device

Details Multiplexer for a piezo ceramic identification device Multiplexer for a piezo ceramic identification device

2006-06-27

2006-06-27

Budd, Mark O. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S317000, C310S319000, C310S339000

Reexamination Certificate

active

07067962

ABSTRACT:
Provided is a multiplexer for a biometric apparatus. The multiplexer includes a plurality of first conductors coupled to the first ends of piezo ceramic elements in corresponding rows and a plurality of first switches each of which is coupled to a respective one of the first conductors and a plurality of second conductors coupled to the second ends of piezo ceramic elements in corresponding columns. The multiplexer also includes a plurality of second switches each of which is coupled to a respective one of the second conductors. The first conductors are approximately orthogonal to the second conductors, and the first switches are controlled to couple a signal output from an output port of the signal generator to a particular piezo ceramic element of the at least twenty five thousand piezo ceramic elements. The second switches are controlled to couple a signal associated with the particular piezo ceramic element of the at least twenty five thousand piezo ceramic elements to an input port of the processor.

REFERENCES:
patent: 4394773 (1983-07-01), Ruell
patent: 5760530 (1998-06-01), Kolesar
patent: 6720712 (2004-04-01), Scott et al.
patent: 6812621 (2004-11-01), Scott
patent: 6844660 (2005-01-01), Scott
patent: 6954025 (2005-10-01), Nishida et al.

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