Patent ID: 8125790
Filing Date: 2012-02-28
Classification: B23K,H01L,H05K,Y02P,Y10T

Abstract:
1. An assembly, comprising: a first device, having a substantially planar side surface and an array of attachment pads for constituting connecting elements formed on said planar side surface of said first device, said pads being arranged in a certain pattern and having certain center distances between them; a second device, also having a substantially planar side surface and an array of attachment pads, similar to the attachment pads of said first device, said attachment pads being arranged in a similar matching pattern and having similar matching center distances between them, as the pattern and center distances of said first device; and a number of attachment elements, joining and connecting each one of said attachments pad of said first device to its corresponding attachment pad of said second device; wherein each one of said attachment pads of the first and second devices has an elongated shape and elongating in a direction that is substantially perpendicular to a respective individual ray, each such ray extending from a predetermined focal point related to said planar side surface of said respective device to substantially the center of each respective pad of said attachment pads; or in other word, said each one of said elongated shape attachment pads is arranged and oriented so as to have its short axis in a direction which extends radially from a predetermined focal point related to said planar side surface of said respective device to substantially the center of each respective pad of said attachment pads; wherein said attachment elements, joining said respective attachment pads, are made of a solder material, and are referred to as solder elements, wherein said solder elements start in a shape of a solder paste, or solder balls or solder preforms, and wherein said solder elements are reflowed to create solder joints between each pair of corresponding attachment pads; and wherein each one of said solder joints acquires, at the end of the reflow process, a cross-section that is substantially similar in shape and orientation to the shape and orientation of its respective attachment pad, at the base of said solder joint near its said respective attachment pad.