Method for adding RF powder and RF powder-added base sheet
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United States of America Patent
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Jul 1, 2014
Grant Date -
Apr 15, 2010
app pub date -
Nov 26, 2007
filing date -
Nov 27, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method is provided for adding an RF powder to a sheet-like object having a high property value, such as a variety of cards, paper money, and securities. The RF powder makes it very difficult to produce, for example, counterfeit cards, documents and bills. Also, an RF powder-added base sheet to which the RF powder has been added is provided. In the method for adding the RF powder, the RF powder includes a plurality of RF powder particles 11 and is disposed on a surface of a base sheet 10 to add the RF powder to the base sheet. Each RF powder particle 11 has a magnetic field coupling circuit element in a high frequency magnetic field having a specific frequency. The RF powder is disposed on a surface of a base sheet by a printing technique. The RF powder-added base sheet 10 includes an RF powder including a plurality of RF powder particles 11 disposed within a printed object on a surface of a base sheet. Each RF powder particle 11 has a magnetic field coupling circuit element in a high frequency magnetic field having a high frequency.
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