Patent ID: 6373267
Filing Date: 2002-04-16
Classification: G01R,H05K

Abstract:
A testing mechanism for a ball grid array-IC comprising:a platelike substrate having outer and tester surfaces defined on opposite sides thereof, and a plurality of ball-receiving contact seats which in their entirety are embedded in the substrate so as to not protrude beyond said outer surface, each said contact seat having an interior conical contact surface which is completely recessed below said outer surface, said interior conical contact surface having an open base end defined at said outer surface and an apex end defined between said outer and tester surfaces; a measuring contact seat and a signal connection pattern connected thereto and implemented on said substrate at said tester surface thereof for each said ball-receiving contact seat, the apex end of each said ball-receiving contact seat being connected to one open end of a signal connection through hole which is formed in the substrate in axial alignment with the respective conical contact surface and which at the other open end thereof opens through the tester surface of said substrate and is connected to the measuring contact seat through the signal connection pattern; and a ball grid array-IC having a plurality of soldering balls arrayed thereon for contact with the respective conical surfaces of the ball-receiving contact seats when the ball grid array-IC is tested, each said ball creating a line contact which surrounds the ball where the ball contacts the respective interior conical contact surface, wherein each of the signal connection through holes defines an open path from the apex end of the respective said ball-receiving contact seat to the open end of the respective signal connection through hole at the tester surface so that debris is capable of passing through each said ball-receiving contact seat and each respective said signal connection through hole.