Patent classifications
G
PHYSICS
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G10
MUSICAL INSTRUMENTS; ACOUSTICS
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G10K
SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
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9/00
Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
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G10K9/122
using piezoelectric driving means
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G10K9/125
with a plurality of active elements
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