(19)

(11)

EP 0 586 597 A1

(12)

(43) Date of publication: 16.03.1994 Bulletin 1994/11 (21) Application number: 92913868.0 (22) Date of filing: 27.05.1992

(51) International Patent Classification (IPC):  G11B 21/ 02( . ) G11B 5/ 55( . ) G11B 5/ 48( . ) (86) International application number: PCT/US1992/004518 (87) International publication number: WO 1992/022056 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 29.05.1991 US 19910706868 (71) Applicant: HUTCHINSON TECHNOLOGY, INC. Hutchinson, Minnesota 55350-9784 (US)	(72) Inventor: JURGENSON, Ryan, A. Hutchinson, MN 55350 (US) (74) Representative: Dipl.-Ing. H. Hauck Dipl.-Ing. E. Graalfs Dipl.-Ing. W. Wehnert Dr.-Ing. W. Döring  Postfach 30 24 30 D-20308 Hamburg D-20308 Hamburg (DE)