Laser marking of plastics objects of any desired shape with special effects
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United States of America Patent
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-
Dec 24, 1991
Grant Date -
N/A
app pub date -
Aug 10, 1990
filing date -
Aug 18, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of laser marking plastics objects of any desired shape, wherein the object to be marked contains a radiation-sensitive additive which effects a change in the light reflectance and is subjected to a laser with pulsed light such that the laser beam is deflected through a mask or directed over the surface of the object to be marked, in conformity with the shape of the marking which is to be applied so as to form a visual effect marking at the areas of impact on said object without the surface of said object suffering damage which is visible to the eye. The method includes using molybdenum disulfide as additive and choosing the laser parameters of wavelength, pulse content and pulse duration such that an effect marking is produced whose contrast undergoes visual change depending on the angle of light and observation.
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