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(11)

EP 3 555 470 A1

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(43) Date of publication: 23.10.2019 Bulletin 2019/43 (21) Application number: 17879841.9 (22) Date of filing: 15.12.2017

(51) International Patent Classification (IPC):  F03G 7/06(2006.01) G02B 27/64(2006.01) G02B 7/09(2006.01) F16M 13/02(2006.01) G02B 7/02(2006.01) G03B 5/00(2006.01) (86) International application number: PCT/US2017/066864 (87) International publication number: WO 2018/112436 (21.06.2018 Gazette 2018/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD TN (30) Priority: 16.12.2016 US 201662435231 P (71) Applicant: Hutchinson Technology Incorporated Hutchinson, Minnesota 55350-9784 (US)	(72) Inventors: MILLER, Mark A. Hutchinson, Minnesota 55350 (US) LADWIG, Peter F. Hutchinson, Minnesota 55350 (US) RIEMER, Douglas P. Waconia, Minnesota 55387 (US) JELKIN, Duane M. Hutchinson, Minnesota 55350 (US) SCHUMANN, John L. Litchfield, Minnesota 55355 (US) (74) Representative: Anderson, Oliver Ben  Venner Shipley LLP 200 Aldersgate London EC1A 4HD London EC1A 4HD (GB)