Patent ID: 7660126

Claim:
A flexible printed circuit board for a portable device having a first member and a second member capable of moving with respect to the first member, the flexible printed circuit board operable to connect the first member and the second member for receiving and transmitting an electrical signal therebetween and comprising: a flexible insulated material sheet and a minute circuit printed on the flexible insulated material sheet, and wherein a horizontal portion of the flexible printed circuit board is formed so that each of opposite lengthwise edge parts of the horizontal portion positioned along an entire lengthwise length of the horizontal portion at opposite lengthwise edges of the horizontal portion has a greater length than a lengthwise dimension between the opposite lengthwise edge parts; wherein the length of the opposite edge parts is set in view of a tensile-deformed length when the flexible printed circuit board is twisted; and wherein the length of the opposite edge parts is set depending on the width and torsion angles of the flexible printed circuit board.