(19)
(11) EP 0 266 485 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.11.1988 Bulletin 1988/44

(43) Date of publication A2:
11.05.1988 Bulletin 1988/19

(21) Application number: 87107567

(22) Date of filing: 24.05.1987
(84) Designated Contracting States:
DE ES FR GB SE

(30) Priority: 05.11.1986 IT 293286

(71) Applicant: ELECTRONSYSTEM S.p.A.
 ()

(72) Inventors:
  • Giorgioni, Tullio
     ()
  • Cortinovis, Bruno
     ()

   


(54) Electromechanical horn with excitation of its acoustic diaphragm controlled electronically by sensors which measure its resonance frequency


(57) In this electromechanical horn (T), which is provided with an acoustic diaphragm (5) able to undergo movements induced in it by variable magnetic fields generated by an electromagnet (3), the electromagnet (3) which operates the diaphragm (5) is excited by frequencies generated by an electronic oscillator which are based on the value of the maximum diaphragm resonance frequency measured by a specific sensor (7).







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