Patent ID: 6420776
Filing Date: 2002-07-16
Classification: B23K,H01L

Abstract:
A structure comprising:a substrate, said substrate comprising a substrate first surface and a substrate second surface, opposite said substrate first surface, and a substrate thickness between said substrate first surface and said substrate second surface; a scribe line on said substrate first surface, said scribe line comprising a scribe line width extending in a first direction on said substrate first surface and a scribe line length extending in a second direction, perpendicular to said first direction, on said substrate first surface, said scribe line further comprising a scribe line depth extending into said substrate first surface and a scribe line bottom surface, said scribe line delineating a first region of said substrate from a second region of said substrate on said substrate first surface; a reflective layer formed on said scribe line bottom surface; and a trench formed by a laser beam in said substrate second surface, said trench comprising; a trench opening at said substrate second surface, said trench opening comprising a trench opening width extending in said first direction along said substrate second surface; a trench depth extending from said trench opening to a trench bottom, said trench bottom comprising a portion of said reflective layer on said scribe line bottom surface, said trench bottom comprising a trench bottom width extending in said first direction at said reflective layer of said scribe line bottom surface; first and second trench sides extending from said trench opening to said trench bottom; and a trench length extending in said second direction on said substrate second surface and being at least partially coextensive with said scribe line length on said substrate first surface such that said trench is positioned below said scribe line within said substrate and said trench delineates said first region of said substrate from said second region of said substrate on said substrate second surface.