Patent ID: 7968798

Claim:
A flexible printed board having two planar portions and a bent portion being positioned therebetween comprising: a plurality of first signal lines that is formed on one surface of a base layer of the bent portion and connects the signal lines on the two planar portions; a plurality of first ground lines that is formed on the one surface of the base layer of the bent portion and connects the ground lines on the two planar portions; a plurality of second ground lines that is formed on the other surface of the base layer of the bent portion and connects the ground lines on the two planar portions in a diagonal mesh pattern; a plurality of third ground lines that connects the plurality of second ground lines and is formed in a direction orthogonal to a bending direction of the bent portion; and through holes that connect the first ground lines on the one surface of the bent portion to the second ground lines or the third ground lines on the other surface of the bent portion; wherein the first signal lines and the first ground lines are formed in parallel to the bending direction of the bent portion.