Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-12-22
1998-06-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310319, H01L 4108
Patent
active
057605300
ABSTRACT:
A two-dimensional, electrically-multiplexed robotic tactile sensor realized by capacitively coupling a piezoelectric film such as a polyvinylidene fluoride (PVDF) polymer film to a monolithic silicon integrated circuit. The disclosed integrated circuit incorporates 64 identical sensor electrodes arranged in a symmetrical 8.times.8 matrix and physically adjacent electronic amplification for each sensor electrode signal. The response of a typical tactile sensor is linear for loads spanning the range of 0.8 to 135 grams of force and provides a response bandwidth of 20-25 Hz. Stability and response reproducibility limitations often associated with piezoelectric-based tactile sensors are resolved by a pre-charge voltage bias sequence for the PVDF film which initializes the pre-and post-load sensor responses. Recognition of sharp-edge, square, trapezoid, isosceles triangle, circle, toroid, slotted screw, and cross-slotted screw shapes using the sensor is also disclosed.
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Budd Mark O.
Hollins Gerald B.
Kundert Thomas L.
The United States of America as represented by the Secretary of
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