公开(公告)号：EP4086311A1

公开(公告)日：2022-11-09

申请号：EP21215217.7

申请日：2021-12-16

Applicant: Apple Inc.

Inventor： BAO, Lijie ,  LIU, Jiayun ,  TONG, Fei ,  MATLAK, Jozef M. ,  POSTAK, Sonja R. ,  TRYON, Brian S.

IPC: C09D1/00 ,  C01B21/06 ,  C09D5/33 ,  C23C14/06 ,  C23C16/34 ,  G04G17/02 ,  G06F1/16 ,  H05K5/02

Abstract: An electronic device may include conductive structures with a light-reflecting coating. The coating may have a two or four-layer thin-film interference filter. The two-layer filter may have a CrN layer and an SiCrN layer. The four-layer filter may have two CrN layers and two SiCrN layers. The two-layer filter may be used to coat relatively small conductive components. The four-layer filter may be used to coat a conductive housing sidewall. Both types of interference filter may produce a relatively uniform light blue color despite variations in coating thickness produced on account of the geometry of the underlying conductive structure.