(19)

(11)

EP 0 624 305 A1

(12)

(43) Date of publication: 17.11.1994 Bulletin 1994/46 (21) Application number: 93900955.0 (22) Date of filing: 08.12.1992

(51) International Patent Classification (IPC):  G11B 5/ 60( . ) G11B 21/ 21( . ) H05K 3/ 10( . ) G11B 5/ 48( . ) H05K 1/ 11( . ) (86) International application number: PCT/US1992/010607 (87) International publication number: WO 1993/015593 (05.08.1993 Gazette 1993/19)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 28.01.1992 US 19920808406 (71) Applicant: HUTCHINSON TECHNOLOGY, INC. Hutchinson Minnesota 55350 (US)	(72) Inventors: BENNIN, Jeffry, S. Hutchinson, MN 55350 (US) BJORK, Kevin Litchfield, MN 55355 (US) BOUCHER, Todd, W. Stewart, MN 55385 (US) DETTMAN, James, H. Lester Prairie, MN 55354 (US) HOFFLANDER, Michael, T. Edina, MN 55435 (US) (74) Representative: Graalfs, Edo, Dipl.-Ing., et al  Postfach 30 24 30 D-20308 Hamburg D-20308 Hamburg (DE)