Patent ID: 8804348

Claim:
A flexible printed circuit board, comprising: a substrate comprising a resin base material; and signal wires on the substrate, the resin base material being formed to define: a first segment having a first width; and a second segment having a second width larger than the first width, the signal wires extending in a first direction in the first segment and changing direction so as to extend in a second direction different from the first direction in the second segment; the width of the first segment and the width of the second segment being a dimension of the resin base material perpendicular to the first direction, the flexible printed circuit board further comprising: a connecting portion that is formed in the second segment at an end of the signal wires for transmitting an electric signal; a breakage detection portion in which the signal wires are not disposed, formed at an edge of the second segment, and at an inside of a curve defined by the change of direction of the signal wires from the first direction to the second direction; and a through hole formed in the second segment, between the breakage detection portion and the signal wires in the second segment, the connecting portion extending along a side edge of the resin base material in the second segment that extends in the first direction.