Patent ID: 7381901
Filing Date: 2008-06-03
Classification: H05K

Abstract:
1. A hinge board which includes a hinge bending part and a rigid part, comprising: not less than two flexible wiring boards including a polyimide sheet layer, a conductor layer having a circuit formed on both sides or one side of the polyimide sheet layer, and a coverlay film layer covering the conductor layer, a flexible single-sided wiring board, which includes a polyimide sheet layer and a conductor layer having a circuit formed on one side of the polyimide sheet layer, formed on an uppermost surface and/or a lowermost surface of the hinge board, and a bonding material for bonding the flexible wiring boards, wherein the polyimide sheet layers have a thickness within a range of 5 to 50 μm, wherein at least one of the flexible wiring boards is a flexible double-sided wiring board including the conductor layers formed on both sides of the polyimide sheet layer, wherein the flexible wiring boards are bonded to each other in the rigid part by use of the bonding material in such a manner that a space part is formed between the flexible wiring boards in the hinge bending part, and wherein the conductor layer of the flexible single-sided wiring board is formed on an upper surface side of the flexible single-sided wiring board which is formed on the uppermost surface of the hinge board and/or on a lower surface side of the flexible single-sided wiring board which is formed on the lowermost surface of the hinge board.