公开(公告)号：US20220350062A1

公开(公告)日：2022-11-03

申请号：US17459843

申请日：2021-08-27

Applicant: Apple Inc.

Inventor： Lijie Bao ,  Jiayun Liu ,  Fei Tong ,  Jozef M. Matlak ,  Sonja R. Postak ,  Brian S. Tryon

IPC: G02B5/28 ,  H05K5/00

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.