(19)
(11) EP 0 624 893 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.10.1995 Bulletin 1995/41

(43) Date of publication A2:
17.11.1994 Bulletin 1994/46

(21) Application number: 94302505.6

(22) Date of filing: 08.04.1994
(51) International Patent Classification (IPC)5: H01J 23/087, H01F 7/02
(84) Designated Contracting States:
DE FR IT

(30) Priority: 12.05.1993 GB 9309738
03.08.1993 GB 9317434

(71) Applicant: EEV LIMITED
Chelmsford, Essex, CM1 2QU (GB)

(72) Inventors:
  • Ward, Kevin Dennis,
    Braintree, Essex (GB)
  • Brewin, Michael Anthony,
    Leicestershire LE10 0UZ (GB)

(74) Representative: Cockayne, Gillian 
GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Magnet arrangements


    (57) In a magnet arrangement suitable for providing PPM focusing, cylindrical magnets 4 have inclined inner faces 6 and 7 meeting at an edge 8. Pole pieces 9 are contiguous with the inclined faces 6 and 7 to provide a relatively large field within the volume enclosed by the arrangement. Preferably, the magnet is of a type II magnetic material.






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