The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2001
Filed:
Jun. 09, 2000
Robert F. Darveaux, Higley, AZ (US);
Barry M. Miles, Chandler, AZ (US);
Alexander W. Copia, Chandler, AZ (US);
Amkor Technology, Inc., Chandler, AZ (US);
Abstract
The invention discloses a method of making solder ball mounting pads on a substrate that have better ball shear performance, ball thermal cycle reliability, ball attach yield, and ball positional tolerances, than the solder ball mounting pads of the prior art. The method includes providing a sheet of material having a layer of metal thereon, and patterning the layer to define a solder ball mounting pad therein. The pad includes a central pad having at least two spokes radiating outward from it. An insulative mask is formed over the metal layer, and an opening is formed in the mask such that the central pad and an inner portion of each of the spokes is exposed therethrough, and an outer portion of each of the spokes is covered by the mask. In one embodiment, the central pad, spokes, and opening in the mask are shaped and arranged with respect to each other such that the pad and exposed portion of the spokes form a radially symmetrical pattern within the opening.