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(11)

EP 4 204 884 A1

(12)

(43) Date of publication: 05.07.2023 Bulletin 2023/27 (21) Application number: 20953747.1 (22) Date of filing: 19.09.2020

(51) International Patent Classification (IPC):  G02B 15/00(2006.01) G02B 15/14(2006.01) (52) Cooperative Patent Classification (CPC): G02B 13/0035; G02B 13/009; G02B 13/004; G02B 15/144513; G02B 15/143101; G02B 15/143503 (86) International application number: PCT/CN2020/116344 (87) International publication number: WO 2022/056889 (24.03.2022 Gazette 2022/12)

(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 (71) Applicant: Huawei Technologies Co., Ltd. Shenzhen, Guangdong 518129 (CN)	(72) Inventors: NIHEI, Yasuhide Yokohama Kanagawa 221-0056 (JP) MATSUI, Takumi Yokohama Kanagawa 221-0056 (JP) (74) Representative: Epping - Hermann - Fischer  Patentanwaltsgesellschaft mbH Schloßschmidstraße 5 80639 München 80639 München (DE)