Patent ID: 6940168
Filing Date: 2005-09-06
Classification: B23K,G01R,H05K,Y02P,Y10T

Abstract:
1. An electrical structure, comprising: a substrate for the attachment of a ball grid array electronic package thereto by means of solder balls and solder paste wherein connection is made between a contact on the ball grid array electronic package and a solder ball by means of a first joining medium and between said solder ball; and a substrate contact arranged on the substrate wherein the contact arranged on the substrate is substantially quadrilateral in shape and has at least one transverse dimension greater than a diameter of said solder ball, wherein said substrate contact is configured on the substrate in relation to the solder ball such that an x-ray through said electronic package illuminates said solder ball and said contact, so that a bad joint shows in an x-ray image resulting from said x-rays as a round image of said solder ball and a good joint, in which said solder ball (tows into said substantially quadrilateral shape, shows in said x-ray image as a quadrilateral image.