Incorporation of markings in optical media
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United States of America Patent
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Jul 1, 2008
Grant Date -
Jun 24, 2004
app pub date -
Nov 5, 2003
filing date -
Jun 6, 2001
priority date (Note) -
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Abstract
Optical media having markings that are non-interfering, or substantially non-interfering with readout of data from the optical media are disclosed. The optical media make use of certain formulations of color forming coatings described herein. Protective coatings used to enhance the color forming coatings are also presented. Methods for incorporating the coatings into the optical media are included. In preferred embodiments, the marking is formed in a photosensitive coating that is applied to the optical media, and then cured with a first light. A second light, having a substantially separate band of wavelengths from the first light, is used to image a marking into the coating. The coating is robust to many external influences, such as ambient environmental conditions, and physical wear.
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