Method of back cutting silicon wafers during a dicing procedure
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Aug 16, 1995
filing date -
Aug 16, 1995
priority date (Note) -
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Abstract
An improved back cut method is provided in a dicing procedure for separating a plurality of printheads formed in a silicon wafer. The wafer has alignment fiducial marks formed within a composite wafer. Infrared light is directed into the wafer and is reflected back through the wafer from the fiducial marks. The reflected light is detected by a CCD camera mounted on a dicing saw. The fiducial coordinates are stored in memory and displayed so that the dicing saw can be aligned with regard to the alignment marks. A back cut operation is enabled so that the saw partially cuts through the composite wafer. A subsequent dicing step separates individual printheads from the wafer.
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