| CPC H05K 5/04 (2013.01) [C25D 11/12 (2013.01); C25D 21/12 (2013.01); H04B 1/3888 (2013.01); Y10T 428/1259 (2015.01)] | 15 Claims |
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1. An electronic device comprising:
a housing configured to form a portion of an outer surface of the electronic device; and
a display disposed in the housing and visually exposed through one side of the housing,
wherein the housing comprises a first portion containing a metallic material,
wherein the first portion comprises:
a base material layer made of the metallic material,
a first film layer disposed adjacent to a surface of the housing, the first film layer containing oxide of the metallic material, and
a second film layer disposed between the base material layer and the first film layer, the second film layer containing oxide of the metallic material,
wherein the first film layer comprises a first pore structure configured to extend in a first direction substantially perpendicular to a surface of the first film layer,
wherein the second film layer comprises a second pore structure at least partially in fluid communication with the first pore structure,
wherein the second pore structure comprises a central pore extending from the first pore structure toward the base material layer with a width smaller than the first pore structure and a plurality of inclined pores extending from the central pore downward toward the base material layer, and
wherein each of the plurality of inclined pores is in at least partial fluid communication with the first pore structure through the central pore.
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