EP 0354520 A3 19910403 - ELECTROACOUSTIC TRANSDUCER
Title (en)
ELECTROACOUSTIC TRANSDUCER
Publication
Application
Priority
DE 3827165 A 19880810
Abstract (en)
[origin: EP0354520A2] The invention relates to an electroacoustic transducer comprising a circular transducer plate (6) provided with a piezoelectric layer and arranged in a transducer housing, clamped between support bodies in the edge region. <??>It is the object to dampen higher-order partial oscillations. <??>This object is achieved by the fact that at least one rest area of a support body has a rotationally asymmetrical shape. Applicable in transducers of telephones. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 17/00 (2006.01)
CPC (source: EP US)
H04R 17/00 (2013.01 - EP US); H04R 2499/11 (2013.01 - EP US)
Citation (search report)
[X] PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 244 (E-346)[1967], 30. September 1985; & JP-A-60 96 094 (MATSUSHITA DENKI SANGYO K.K.) 29-05-1985
Designated contracting state (EPC)
AT CH DE FR GB LI NL
DOCDB simple family (publication)
EP 0354520 A2 19900214; EP 0354520 A3 19910403; EP 0354520 B1 19940420; AT E104823 T1 19940515; CN 1015289 B 19920101; CN 1040297 A 19900307; DE 58907495 D1 19940526; JP H0281600 A 19900322; US 5030872 A 19910709
DOCDB simple family (application)
EP 89114587 A 19890807; AT 89114587 T 19890807; CN 89103976 A 19890614; DE 58907495 T 19890807; JP 20492889 A 19890809; US 38899489 A 19890803