(19)
(11) EP 0 188 609 A1

(12)

(43) Date of publication:
30.07.1986 Bulletin 1986/31

(21) Application number: 85903960.0

(22) Date of filing: 01.08.1985
(51) International Patent Classification (IPC): 
H04R 3/ 00( . )
H04R 17/ 00( . )
(86) International application number:
PCT/US1985/001469
(87) International publication number:
WO 1986/001362 (27.02.1986 Gazette 1986/05)
(84) Designated Contracting States:
AT BE CH DE FR GB LI NL SE

(30) Priority: 03.08.1984 US 19840637649

(71) Applicant: MOTOROLA, INC.
Schaumburg, IL 60196 (US)

(72) Inventor:
  • HALCHUCK, Timothy, William
    Gardena, CA 90249 (US)

   


(54) PIEZOELECTRIC LOUDSPEAKER HAVING A FEEDBACK TRANSDUCER