EP 1005691 A1 20000607 - ACOUSTIC TRANSDUCER
Title (en)
ACOUSTIC TRANSDUCER
Title (de)
SCHALLWANDLER
Title (fr)
TRANSDUCTEUR
Publication
Application
Priority
- DE 19736808 A 19970823
- DE 19750179 A 19971113
- EP 9805260 W 19980819
Abstract (en)
[origin: US6353277B1] An acoustic transducer, especially an air transducer, including a piezoceramic disk (10). The object of the invention is to provide an improved transducer of this type for more efficiently converting electromagnetic waves into mechanical waves and vice versa. To this end, a combination of a piezoceramic disk (10) and a membrane (8) is provided, the membrane being configured as a monomorphic flexural resonator and being composed of an epoxy-hollow glass sphere mixture or of a material which is similar in terms of its acoustic properties. The planar vibration mode (4) in the piezoceramic is converted into a thickness vibration (6) using Poisson's ratio. After the conversion, this thickness vibration is then adapted to the propagation medium, especially air, by a coupling layer having a low acoustic impedance.
IPC 1-7
IPC 8 full level
H04R 17/10 (2006.01); B06B 1/06 (2006.01); H01L 41/09 (2006.01); H04R 17/00 (2006.01)
CPC (source: EP US)
B06B 1/0603 (2013.01 - EP US); B06B 1/0611 (2013.01 - EP US); B06B 1/0644 (2013.01 - EP US); B06B 1/0688 (2013.01 - EP US); H04R 17/00 (2013.01 - EP US)
Citation (search report)
See references of WO 9910874A1
Designated contracting state (EPC)
CH DE FR GB LI NL
DOCDB simple family (publication)
US 6353277 B1 20020305; EP 1005691 A1 20000607; JP 2001514455 A 20010911; JP 3416648 B2 20030616; WO 9910874 A1 19990304
DOCDB simple family (application)
US 48619100 A 20000707; EP 9805260 W 19980819; EP 98945260 A 19980819; JP 2000508107 A 19980819