Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Patent
1995-03-13
1998-05-12
Kuntz, Curtis
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
381156, 381173, 381191, H04R 2500
Patent
active
057518270
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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Barnie Rexford N.
Griggs Dennis T.
Kuntz Curtis
Primo Microphones, Inc.
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