Piezoelectric bending transducer and the use thereof
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United States of America Patent
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Jan 7, 1992
Grant Date -
N/A
app pub date -
Jun 22, 1990
filing date -
Jun 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piezoelectric bending transducer is described which is suitable for installation in a valve channel. It is composed of at least one ceramic layer which is metalized on both sides and has piezoelectric properties and which is polarized such that on application of a voltage it undergoes a change in length, and of at least one rigid molding which is joined to the whole surface thereof and has approximately the same surface dimensions and which on application of a voltage does not undergo an elongation or undergoes an opposite elongation. The piezoceramic layer contains an unmetallized area which has a roughness R.sub.a of less the 0.5 .mu.m and covers an orifice in the valve channel.
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