(19)

(11)

EP 0 463 068 A1

(12)

(43) Date of publication: 02.01.1992 Bulletin 1992/01 (21) Application number: 90905173.0 (22) Date of filing: 19.03.1990

(51) International Patent Classification (IPC):  G11B 7/ 0033( . ) G11B 7/ 09( . ) G11B 7/ 085( . ) (86) International application number: PCT/CA1990/000092 (87) International publication number: WO 1990/011599 (04.10.1990 Gazette 1990/23)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 17.03.1989 US 19890325174 (71) Applicant: OPTICAL RECORDING CORPORATION Toronto, Ontario M5V 2E4 (CA)	(72) Inventors: ADAMSON, G., John Toronto, Ontario M8Y 2A1 (CA) CHU, Ching Mississauga, Ontario L5J 3P9 (CA) DRAGANOFF, Georgi 565 Sherbourne Street Toronto, Ontario M4X 1W6 (CA) (74) Representative: Weitzel, Wolfgang, Dr.-Ing.  Friedenstrasse 10 D-89522 Heidenheim D-89522 Heidenheim (DE)