(19)
(11) EP 0 235 991 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.05.1989 Bulletin 1989/21

(43) Date of publication A2:
09.09.1987 Bulletin 1987/37

(21) Application number: 87301271.0

(22) Date of filing: 13.02.1987
(51) International Patent Classification (IPC)4: H04R 7/12
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 14.02.1986 GB 8603645

(71) Applicant: CELESTION INTERNATIONAL LIMITED
Ipswich Suffolk IP3 8JP (GB)

(72) Inventor:
  • White, Ian Stanley
    Ipswich Suffolk (GB)

(74) Representative: Thomson, Roger Bruce et al
W.P. THOMPSON & CO. Celcon House 289-293 High Holborn
London WC1V 7HU
London WC1V 7HU (GB)


(56) References cited: : 
   
       


    (54) Cone loudspeakers


    (57) In a cone loudspeaker having a central dome (14), an annular cone (10) around the dome, and a voice coil (18), the central dome (14) is made mechanically strong and axially stiff and is an acoustic radiator in its own right. The dome (14) is preferably also radially stiff and its radial stiffness may be enhanced by a circumferential reinforcing ring. The dome is preferably hemispherical and may be made of aluminium, titanium or fibre-reinforced plastics materials.







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