(19)
(11) EP 0 582 557 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.01.1995 Bulletin 1995/03

(43) Date of publication A2:
09.02.1994 Bulletin 1994/06

(21) Application number: 93830348.4

(22) Date of filing: 03.08.1993
(51) International Patent Classification (IPC)5: G10K 9/12, B06B 1/06
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IE LI LU MC NL PT SE

(30) Priority: 05.08.1992 IT RM920591

(71) Applicant: IMAPO S.r.l.
I-80125 Agnano (NA) (IT)

(72) Inventors:
  • Brachi, Massimo
    I-84133 Salerno (IT)
  • Lamberti, Nicola
    I-84081 Orignano di Baronissi (SA) (IT)
  • Pappalardo, Massimo
    I-00198 Roma (IT)

(74) Representative: Fiammenghi-Domenighetti, Delfina et al
Fiammenghi-Fiammenghi Via Quattro Fontane 31
00184 Roma
00184 Roma (IT)


(56) References cited: : 
   
       


    (54) Piezomembrane constrained in the center and its employment to provide an acoustic howler


    (57) A piezoelectrictric transducer device with a piezomembrane coupled, by means of a central pin, to a loading plate, which in turn is constrained on its external circumferance, is employed to provide an acoustic howler in which the loading plate is integrant part of the howler casing.






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