(19)

(11)

EP 0 409 825 A1

(12)

(43) Date of publication: 30.01.1991 Bulletin 1991/05 (21) Application number: 87907765.0 (22) Date of filing: 12.11.1987

(51) International Patent Classification (IPC):  G02B 3/ 02( . ) G02B 17/ 08( . ) G02B 13/ 14( . ) (86) International application number: PCT/FI1987/000152 (87) International publication number: WO 1988/003658 (19.05.1988 Gazette 1988/11)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 14.11.1986 FI 19860004655 (71) Applicant: HERMAS, Kalervo Alfred August SF-02380 Espoo (FI)	(72) Inventor: HERMAS, Kalervo Alfred August SF-02380 Espoo (FI) (74) Representative: Onn, Christer, et al  Awapatent AB Box 45086 S-104 30 Stockholm S-104 30 Stockholm (SE)