EP 0264557 A3 19891206 - PIEZOELECTRIC SOUND TRANSDUCER
Title (en)
PIEZOELECTRIC SOUND TRANSDUCER
Publication
Application
Priority
DE 3629093 A 19860827
Abstract (en)
[origin: EP0264557A2] A piezoceramic sound transducer having a metal diaphragm which carries in its centre a ceramic disc, and comprising a support ring moulded onto the outside circumference of the diaphragm, the metal diaphragm exhibiting at least one concentric annular groove at a distance from the support ring. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 17/00 (2006.01); H04R 17/02 (2006.01); H04R 17/10 (2006.01)
CPC (source: EP KR)
H04R 17/00 (2013.01 - EP); H04R 17/02 (2013.01 - KR)
Citation (search report)
- [X] FR 854121 A 19400405 - CSF
- [A] US 4449019 A 19840515 - KAKEHI SASUGA [JP], et al
- [A] DE 1112548 B 19610810 - KRONE KG
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0264557 A2 19880427; EP 0264557 A3 19891206; DE 3629093 A1 19880310; IL 83648 A0 19880131; JP S6367900 A 19880326; KR 880003535 A 19880517; KR 900006323 B1 19900828
DOCDB simple family (application)
EP 87111434 A 19870807; DE 3629093 A 19860827; IL 8364887 A 19870825; JP 20734487 A 19870820; KR 870009213 A 19870824