Patent ID: 11903145
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A wiring board, comprising:
a core portion; and
buildup portions on opposite surfaces of the core portion,
each of the buildup portions including a first insulating layer on the core portion, a wire pattern on the first insulating layer, a second insulating layer on the first insulating layer to cover the wire pattern, fillers distributed in the second insulating layer, and a protection layer covering the second insulating layer,
the protection layer exposing a portion of the wire pattern,
the second insulating layer being formed of a material different from a material of the first insulating layer,
the protection layer being formed of a same material as the second insulating layer,
the wire patterns of the buildup portions being electrically connected to each other,
a thickness of the protection layer ranging from 1 μm to 3 μm,
a degree of roughness of a surface of the protection layer being greater than a degree of roughness of the second insulating layer, and
the surface of the protection layer facing the core portion.