(19)

(11)

EP 0 943 115 A1

(12)

(43) Date of publication: 22.09.1999 Bulletin 1999/38 (21) Application number: 97952263.0 (22) Date of filing: 05.12.1997

(51) International Patent Classification (IPC):  G02B 27/ 22( . ) H04N 13/ 00( . ) G02B 27/ 26( . ) (86) International application number: PCT/US1997/022108 (87) International publication number: WO 1998/025172 (11.06.1998 Gazette 1998/23)

(84) Designated Contracting States: AT BE CH DE ES FR GB IE IT LI NL (30) Priority: 06.12.1996 US 19960032517P (71) Applicant: The Rowland Institute For Science Cambridge, MA 02142 (US)	(72) Inventor: DUBOIS, Philip, M. Peterborough, NH 03458 (US) (74) Representative: Greenwood, John David  Graham Watt & Co. Riverhead Sevenoaks Kent TN13 2BN Sevenoaks Kent TN13 2BN (GB)