(19)

(11)

EP 1 051 652 A1

(12)

(43) Date of publication: 15.11.2000 Bulletin 2000/46 (21) Application number: 99900563.0 (22) Date of filing: 08.01.1999

(51) International Patent Classification (IPC)7: G02B 21/00, G02B 21/06 (86) International application number: PCT/GB9900/065 (87) International publication number: WO 9935/527 (15.07.1999 Gazette 1999/28)

(84) Designated Contracting States: BE DE DK ES FI FR GB IT NL SE (30) Priority: 12.01.1998 EP 98300179 (71) Applicant: WALLAC OY 20101 Turku (FI)	(72) Inventor: MASON, William Great Shelford,Cambridge CB2 5EL (GB) (74) Representative: Haley, Stephen  Gill Jennings & Every,Broadgate House,7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)