Global Patent Index - EP 1005691 A1

EP 1005691 A1 2000-06-07 - ACOUSTIC TRANSDUCER

Title (en)

ACOUSTIC TRANSDUCER

Title (de)

SCHALLWANDLER

Title (fr)

TRANSDUCTEUR

Publication

EP 1005691 A1 (DE)

Application

EP 98945260 A

Priority

  • DE 19736808 A
  • DE 19750179 A
  • EP 9805260 W

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 (main, further and additional classification)

G10K 9/122; H04R 17/10

IPC 8 full level (invention and additional information)

H04R 17/10 (2006.01); B06B 1/06 (2006.01); H01L 41/09 (2006.01); H04R 17/00 (2006.01)

CPC (invention and additional information)

B06B 1/0644 (2013.01); B06B 1/0603 (2013.01); B06B 1/0611 (2013.01); B06B 1/0688 (2013.01); H04R 17/00 (2013.01)

Citation (search report)

See references of WO 9910874A1

Designated contracting state (EPC)

CH DE FR GB LI NL

EPO simple patent family

US 6353277 B1 20020305; EP 1005691 A1 20000607; JP 2001514455 A 20010911; JP 3416648 B2 20030616; WO 9910874 A1 19990304

INPADOC legal status


2008-08-20 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20080301

2007-01-17 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWAN

2003-11-19 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DERANGEWAND

2000-06-07 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000112

2000-06-07 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH DE FR GB LI NL