Composite film for preventing forgery, and composite method for preventing forgery
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United States of America Patent
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Mar 3, 2015
Grant Date -
Nov 7, 2013
app pub date -
Aug 1, 2011
filing date -
Aug 2, 2010
priority date (Note) -
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Abstract
According to one embodiment of the present invention, a composite film comprising an indication area for preventing forgery is provided. The indication area comprises a magnetic solution distributed in a cured medium. The magnetic solution is a colloidal solution in which a plurality of magnetic particles charged in the same polarity are dispersed in a fluid, at least one of reflective light and transmittance of the magnetic solution changing when a magnetic field is applied, and an expressive material, of which a predetermined characteristic is expressed when specific energy is applied, is present separately from the magnetic solution in the cured medium.
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