Patent ID: 9077122
Filing Date: 2015-07-07
Classification: G01R,H01R,H05K,Y10T

Abstract:
1. A circuit board connecting structure comprising: a rigid circuit board having a first electrode, an anisotropic conductive member, and a flexible circuit board having a second electrode as a land formed on the flexible circuit board, a support plate being provided in direct contact with at least part of a flat surface of the flexible circuit board opposite from the rigid circuit board, the anisotropic conductive member being connected to the rigid circuit board and the flexible circuit board by a pressure member, wherein the anisotropic conductive member includes conductive passages penetrating an insulating matrix in a thickness direction of the insulating matrix, the conductive passages being made of a conductive material comprising a metal or a metal alloy; and isolated from each other, one end of each of the conductive passages having a first projecting portion projecting from one surface of the insulating matrix and another end of each of the conductive passages having a second projecting portion projecting from another surface of the insulating matrix, a height of the second projecting portion out of contact being 5 μm or more and not greater than twice a thickness of the land as measured from a surface of the flexible circuit board, wherein electrical connection between the rigid circuit board and the flexible circuit board is achieved as the first projecting portions of the conductive passages contact at least part of the first electrode of the rigid circuit board and the second projecting portions communicating with the first projecting portions through the conductive passages contact at least part of the surface of the land formed on the flexible circuit board, a pressure being applied such that the insulating matrix of the anisotropic conductive member does not directly contact the flexible circuit board, and wherein the pressure applied to the surface of the land is 300 MPa inclusive to 1000 MPa inclusive.