Patent ID: 9642255
Date: 2017-05-02
CPC Classifications: G01R,H05K,Y10T

Claim:
1. A membrane sheet with bumps for a probe card, comprising: an insulating membrane made of polyimide; a bump formed from nickel and comprising a bottom face that faces a face of the insulating membrane and extending completely externally thereof so as to electrically contact with an electrode pad of a semiconductor chip formed on a wafer; and a conductive electrode having an upper face that faces the bottom face of the bump and that extends from the bump through the insulating membrane to a reverse face of the insulating membrane which is opposite the face of the insulating membrane; wherein a portion of the conductive electrode located between the face and the reverse face of the insulating membrane has a cross-section of a trapezoid that decreases in width toward the face of the insulating membrane, and wherein the bump has a triangular cross-section and wherein the bottom face of the bump is larger than the upper face of the conductive electrode such that an outer peripheral portion of the bottom face contacts and engages with the face of the insulating membrane so as to restrict the conductive electrode from movement in a direction toward the reverse face of the insulating membrane.