Piezoelectric speaker
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United States of America Patent
Stats
-
May 12, 1998
Grant Date -
N/A
app pub date -
Mar 13, 1995
filing date -
Mar 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piezoelectric speaker includes a casing and cover member having a transverse wall extending therebetween which forms a sound transmission channel having a spiral curved or double reverse bend shape and being of substantially continuously increasing cross sectional area between an inlet portion of said channel and an outlet opening to atmosphere. A driver element comprising a diaphragm formed of fiber reinforced epoxy, polyester or ABS resin has a piezoelectric ceramic disk secured thereto and supported in a recess formed on the cover member. A sound transmission opening in the cover member communicates with the inlet portion of the sound transmission channel. The diaphragm may be formed integral with the cover member. The speaker has the capability of expanding the frequency band width of audible sound at relatively high sound pressure levels.
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