(19)

(11)

EP 0 724 744 A1

(12)

(43) Date of publication: 07.08.1996 Bulletin 1996/32 (21) Application number: 93906727.0 (22) Date of filing: 22.03.1993

(51) International Patent Classification (IPC):  G02B 27/ 22( . ) H04N 13/ 04( . ) H04N 13/ 00( . ) (86) International application number: PCT/GB1993/000590 (87) International publication number: WO 1993/019394 (30.09.1993 Gazette 1993/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 20.03.1992 GB 19920006048 (71) Applicant: DELTA SYSTEM DESIGN LIMITED London WC2H 9AJ (GB)	(72) Inventor: ASHBEY, James, Amachi London WC2H 9AJ (GB) (74) Representative: Harland, Linda Jane  c/o Reddie & Grose 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)