(19)
(11) EP 1 819 191 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
24.10.2007 Bulletin 2007/43

(88) Date of publication A3:
22.08.2007 Bulletin 2007/34

(43) Date of publication:
15.08.2007 Bulletin 2007/33

(21) Application number: 07109446.0

(22) Date of filing: 14.12.2005
(51) International Patent Classification (IPC): 
H04R 1/44(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(62) Application number of the earlier application in accordance with Art. 76 EPC:
05027342.4 / 1799009

(71) Applicant: Undersea Systems International, Inc. Dba Ocean Technology Systems
Costa Mesa CA 92626 (US)

(72) Inventor:
  • Peck, Jerry
    Mission Viejo, CA 92692 (US)

(74) Representative: Viering, Jentschura & Partner 
Grillparzerstrasse 14
81675 München
81675 München (DE)

 
Remarks:
This application was filed on 01 - 06 - 2007 as a divisional application to the application mentioned under INID code 62.
 


(54) Laminated piezoelectric transducer


(57) An underwater acoustic transducer (10) comprising a laminated waterproof and sealed active acoustic element (14) for transducing sound and electrical signals; a front and rear housing element (24) disposed on each side of the active acoustic element (14) to define a corresponding front and rear acoustic chamber on each side of the active acoustic element (14), each housing element (24) defining a corresponding port (30) therethrough of a predetermined diameter and thickness to provide tuning of the corresponding acoustic chamber and to provide free flooding acoustic chambers; and a rear cover (38) disposed on the rear housing element (38) and defining a corresponding port (40) therethrough of a predetermined diameter and thickness to provide further tuning of the corresponding rear acoustic chamber while maintaining the free flooding characteristic of the rear acoustic chamber.