Piezoelectric force sensing

Details Piezoelectric force sensing Piezoelectric force sensing

2007-12-11

2010-10-19

Budd, Mark (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S338000

Reexamination Certificate

active

07816838

ABSTRACT:
A system and method for measuring absolute pressure applied to a piezoelectric element by measuring a transition time of a voltage pulse applied to a piezoelectric element. The transition time (such as the rise time and/or fall time of the voltage pulse) is affected by the capacitance of the piezoelectric element, which in turn is affected by the amount of pressure currently being applied to the piezoelectric element. The system may also provide haptic feedback via the same piezoelectric element.

REFERENCES:
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patent: 4428228 (1984-01-01), Banzhaf et al.
patent: 4479070 (1984-10-01), Frische et al.
patent: 5062294 (1991-11-01), Iwata
patent: 7305889 (2007-12-01), Fortin et al.
patent: 2005/0199069 (2005-09-01), Fortin et al.
patent: 2007/0103449 (2007-05-01), Laitinen et al.
patent: 2007/0138584 (2007-06-01), Fortin et al.
“Introduction to Piezoelectric Force Sensors”, Dytran Instruments, Inc., published prior to filing of this application, 3 pages.

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