Flexible printed circuit board having gold fingers

A flexible printed circuit board connecting electrically with a conductive terminal of a rigid printed circuit board and connecting electrically with a terminal of a system, the flexible printed circuit board comprising:

• a base sheet having a first surface and a second surface thereon, and the base sheet having a first end and a second end;
• a metallic layer comprising a first metallic layer and a second metallic layer shorter than the first metallic layer, wherein the first metallic layer is provided on the first surface or the second surface of the base sheet, and the first metallic layer has a first electrical connecting portion for electrically connecting to the terminal of the system that is provided on the first surface or the second surface at the first end in one end, and the first metallic layer has a second electrical connecting portion for electrically connecting to the conductive terminal of the rigid printed circuit board on the second surface or the first surface at the second end in another end, and the second electrical connecting portion has at least one first plated through hole;
• and the second metallic layer is provided on the first surface or the second surface of the base sheet at the second end, and the second metallic layer has a third electrical connecting portion and a fourth electrical connecting portion, and the second metallic layer has at least one second plated through hole between the third electrical connecting portion and the fourth electrical connecting portion, and the second plated through hole communicates with the first plated through hole, and the first plated through hole is formed a plating layer on an internal wall, and the second plated through hole is formed a plating layer on an internal wall;
• and
• a protective sheet provided on the metallic layer and the base sheet to expose the first electrical connecting portion of the first end, the second electrical connecting portion of the second end, the first plated through hole, the third electrically connecting portion and the second plated through hole.