Silicon substrate with identification data
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United States of America Patent
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Apr 17, 2001
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N/A
app pub date -
Feb 19, 1999
filing date -
Feb 20, 1998
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Abstract
A bright-pattern unit cell is formed by forming round dots, each of which is composed of a hemispherical concave portion obtained by applying a laser beam, and arranging these round dots in a matrix vertically and horizontally. Furthermore, a two-dimensional code composed of a matrix having a bright and dark pattern is formed by defining a smooth surface, where a laser beam is not applied, as a dark-pattern unit cell, and combining these bright unit cells with dark unit cells.
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