Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Patent
1997-01-13
1998-09-01
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
381173, 381191, 310324, H04R 2500
Patent
active
058021957
ABSTRACT:
A piezoelectric loudspeaker suitable for midrange frequencies uses a dome shaped piezoelectric actuator to drive a speaker membrane directly. The dome shaped actuator is made from a reduced and internally biased oxygen wafer, and generates excursion of the apex of the dome in the order of 0.02-0.05 inches when a rated drive voltage of 350 V rms is applied between the convex and the concave surfaces of the dome shaped actuator. The load capacity exceeds 10 lbs. The edge of the rim of the dome shaped actuator must be free to rock when the dome height varies to ensure low distortion in the loudspeaker. This is achieved by mounting the rim of the dome shaped actuator on a support surface by prestress only. An exceptionally simple design uses a planar speaker membrane with the center part of one side pressed against the rim of a dome shaped actuator by prestress from a stretched latex surround member.
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Rainbows offer up to ten times the strain and 100 times the load capacity of conventional piezoelectric bimorphs. Brochure by Aura Ceramics, Inc., New Hope, MN 55428.
Rainbow--Handling instructions and Operation. Aura Ceramics, Inc. Oct. 13, 1993.
Hellbaum Richard F.
Jalink, Jr. Antony
Regan Curtis R.
Rohrbach Wayne W.
Barnie Rexford N.
Edwards Robin W.
Kuntz Curtis A.
The United States of America as represented by the Administrator
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