(19)

(11)

EP 4 124 209 A1

(12)

(43) Date of publication: 01.02.2023 Bulletin 2023/05 (21) Application number: 21785691.3 (22) Date of filing: 16.03.2021

(51) International Patent Classification (IPC):  G02B 27/01(2006.01) G02B 26/10(2006.01) G02B 27/10(2006.01) (52) Cooperative Patent Classification (CPC): G02B 27/0172; G02B 26/0833 (86) International application number: PCT/US2021/022639 (87) International publication number: WO 2021/206875 (14.10.2021 Gazette 2021/41)

(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: KH MA MD TN (30) Priority: 16.03.2020 US 202062990401 P 09.12.2020 US 202017117057 (71) Applicant: Auroratech Company San Francisco, CA 94127 (US)	(72) Inventors: PENG, Ziqi (Kelly) San Francisco, CA 94127 (US) SCHMID, Eric Foster City, CA 94404 (US) (74) Representative: Jordan, Volker Otto Wilhelm  Weickmann & Weickmann Patent- und Rechtsanwälte PartmbB Postfach 860 820 81635 München 81635 München (DE)