(19)
(11) EP 0 500 367 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.07.1993 Bulletin 1993/29

(43) Date of publication A2:
26.08.1992 Bulletin 1992/35

(21) Application number: 92301401.3

(22) Date of filing: 20.02.1992
(51) International Patent Classification (IPC)5: G07D 5/08, G07F 3/02
(84) Designated Contracting States:
AT BE CH DK ES FR GB LI

(30) Priority: 20.02.1991 ZA 911248

(71) Applicant: TELKOR (PROPRIETARY) LIMITED
Sandton, Transvaal (ZA)

(72) Inventors:
  • Variawa, Omar Farouk
    Lichtenburg, Transvaal (ZA)
  • Simmonds, Edward Shane
    Sandton, Transvaal (ZA)
  • Botha, Jacobus Theron
    Pretoria, Transvaal (ZA)
  • Chinneck, Edgar Herbert
    Johannesburg, Transvaal (ZA)
  • Kowalczyk, Piotr Leonard
    Krugersdorp, Transvaal (ZA)

(74) Representative: Leale, Robin George 
FRANK B. DEHN & CO. Imperial House 15-19 Kingsway
London WC2B 6UZ
London WC2B 6UZ (GB)


(56) References cited: : 
   
       


    (54) Coil arrangement and static measuring device


    (57) s7 The invention relates to an inductive coil arrangement (18) for measuring the physical characteristics of a token (26). The coil arrangement (18) comprises a plurality of inductors (12,14,16), each inductor being formed out of at least two superposed planar spiral tracks (28,46,52,58,61,61A,62,70) separated by an insulating layer (72A,74A,76A,78A,80A,82A,84A,86A) of a multi-layer electrical device (72,74,76,78,80,82,84,86), such as a plurality of printed circuit boards which are laminated together. Conductive paths (92) extend axially between the tracks. The invention extends to a method of manufacturing the inductive coil arrangement, as well as a to token validation device (10) incorporating the inductive coil arrangement.






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