Communications: electrical – Audible indication – Piezoelectric
Reexamination Certificate
2006-03-28
2006-03-28
Lee, Benjamin C. (Department: 2632)
Communications: electrical
Audible indication
Piezoelectric
C340S407100, C340S007600, C310S311000, C310S321000, C310S326000, C310S327000, C310S332000, C310S334000, C310S348000, C310S357000, C310S367000, C381S345000, C381S353000, C381S354000, C381S190000, C367S140000
Reexamination Certificate
active
07019621
ABSTRACT:
A piezoelectric transducer comprises a piezoelectric component, an acoustic member attached to one of the surfaces of the piezoelectric component and a dampening material of low elastic modulus attached to one or both surfaces of the piezoelectric transducer. The piezoelectric component may comprise either an unimorph or a bimorph structure including a piezoceramic wafer made of lead zirconate titanate and a layer of dampening material sandwiched between the piezoelectric component and the acoustic member.The acoustic member comprises a surrounding wall portion and an end portion which form an acoustic chamber when the member is mounted on a surface of the piezoelectrie component. The end portion has an orifice to form a passageway from the chamber through the end portion to the outside of the member.
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Bryant Robert G.
Fox Robert L.
Woodard Stanley E.
Lee Benjamin C.
Woodard Stanley E.
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