Method for Putting Code Information on a Wafer Case
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United States of America Patent
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Issued Date -
Mar 4, 2010
app pub date -
Sep 2, 2008
filing date -
Sep 2, 2008
priority date (Note) -
Abandoned
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Abstract
A laser light is irradiated on a wafer case made of polymer materials that have a high transparency to visible light and a low transparency to laser light having a wavelength other than the optical wavelength. The wafer case material in the irradiated portion foams, blackens, melts or evaporates by the irradiation. Thus, wafer case information can be marked by concavities and convexities or changing color formed on the wafer case surface. The wafer case information can be formed as a one-dimensional or two-dimensional code. Multiple laser lights can be irradiated on the same portion of the wafer case surface from different directions to the wafer case surface, and thus wafer case information is marked on only the neighborhood of the wafer case surface by foaming, blackening, melting or evaporating only the neighborhood of the wafer case surface that the laser light is irradiated on.
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