Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-09-08
1996-06-04
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310330, 310324, H01L 4108
Patent
active
055236448
ABSTRACT:
A motion sensor includes a piezoelectric transducer and a ball positioned against the transducer, with the ball rollably engaged with the transducer. The transducer generates an electrical signal in response to motion of the ball on the transducer. In a preferred embodiment, the transducer includes a piezoelectric ceramic composite disc which is bonded to a metallic, preferably brass, plate. The ball is positioned against the brass plate for rolling engagement of the ball on the brass plate. When motion of the ball relative to the transducer occurs, the low frequency rolling movement of the ball on the transducer induces the transducer to generate an electrical signal. In an alternate embodiment, the ball is dispensed with, and the transducer is suspended beneath a circuit board by a stiff wire connected to a first end of the transducer and a flexible wire connected to a second end of the transducer. Both wires are attached to the circuit board, so that the transducer can vibrate about its first end in response to movement of the sensor.
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