(19)
(11) EP 0 401 027 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.01.1992 Bulletin 1992/02

(43) Date of publication A2:
05.12.1990 Bulletin 1990/49

(21) Application number: 90305961.6

(22) Date of filing: 31.05.1990
(51) International Patent Classification (IPC)5: G10K 11/34
(84) Designated Contracting States:
DE ES FR IT SE

(30) Priority: 02.06.1989 GB 8912782

(71) Applicant: GEC-MARCONI LIMITED
Stanmore, Middlesex HA7 4LY (GB)

(72) Inventors:
  • Hayward, Gordon
    Clarkston, Glasgow G76 8LQ (GB)
  • Murray, Victor James
    Aberdeen (GB)

(74) Representative: Tolfree, Roger Keith et al
The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) An acoustic transducer


    (57) In order to reduce side lobes in the transmission characteristics of an acoustic transducer the amplitude of transmission is tapered towards the edges of the aperture. This is done by constructing the transducer from ceramic-epoxy composite elements connected in a one-­three configuration and distributed with varying volume fraction in the width and length directions.







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