Patent ID: 11871514
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A flexible printed circuit board comprising a base film and a wiring layer disposed on at least one surface of the base film and having a plurality of wiring lines,
wherein the wiring lines have an average line width of 30 μm or less and an average spacing of 30 μm or less,
the wiring lines have a copper-based plating layer,
the copper-based plating layer has an electrical resistivity of more than 1.68×10−8 Ω·m,
the copper-based plating layer contains sulfur, nitrogen, and carbon, and
in the copper-based plating layer, a content of the sulfur is 0.0001% by mass or more and 0.005% by mass or less, a content of the nitrogen is 0.0001% by mass or more and 0.005% by mass or less, and a content of the carbon is 0.001% by mass or more and 0.01% by mass or less.