Method of laser marking
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United States of America Patent
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-
Aug 29, 1989
Grant Date -
N/A
app pub date -
Oct 22, 1987
filing date -
Nov 14, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pigment layer is provided on a surface of an article on which a marking is to be formed and is irradiated with patterned laser light to change internal molecular structure of pigment to thereby change its color. The marking can be multicolored by a suitable selection of pigment and laser energy density.
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