(19)

(11)

EP 1 058 858 A1

(12)

(43) Date of publication: 13.12.2000 Bulletin 2000/50 (21) Application number: 97953442.7 (22) Date of filing: 29.12.1997

(51) International Patent Classification (IPC)7: G02B 5/128 (86) International application number: PCT/US9723/873 (87) International publication number: WO 9934/241 (08.07.1999 Gazette 1999/27)

(84) Designated Contracting States: AT DE FR GB IT (71) Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY St. Paul,Minnesota 55133-3427 (US)	(72) Inventor: BIELAK, Harald D-47877 Willich (DE) (74) Representative: VOSSIUS & PARTNER  Siebertstrasse 4 81675 München 81675 München (DE)