Method for adding RF powder and RF powder-added base sheet
View Patent ↗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.
1. A method for adding a radio frequency (RF) powder including a plurality of RF powder particles, each RF powder particle having a magnetic field coupling antenna circuit element including an inductive element and a capacitive element and that responds to a high frequency electromagnetic field having a specific frequency, the method comprising:
disposing the RF powder on a surface of a base sheet to add the RF powder to the base sheet; and
disposing a plurality of dummy RF powder particles on the surface of the base sheet, wherein the plurality of dummy RF powder particles is configured to not respond to any electromagnetic fields, and wherein an appearance of the plurality of dummy RF powder particles mimics an appearance of the plurality of RF powder particles.
2. The method for adding the RF powder according to claim 1 , wherein the RF powder is disposed on the surface of the base sheet by a printing technique.
3. The method for adding the RF powder according to claim 2 , wherein the RF powder is disposed on the surface of the base sheet together with a print ink having a specific color.
4. The method for adding the RF powder according to claim 2 , wherein the RF powder is disposed on the surface of the base sheet within a region defined by an object drawn in the ink.
5. The method for adding the RF powder according to claim 4 , wherein the object is a letter, a numeral, or a code.
6. The method for adding the RF powder according to claim 1 , wherein the RF powder is disposed on both surfaces of the base sheet.
7. The method for adding the RF powder according to claim 1 , wherein the RF powder is disposed so as to be embedded in the surface of the base sheet.
8. The method for adding the RF powder according to claim 1 , wherein the plurality of RF powder particles included in the RF powder respond to the same frequency, and hence the specific frequency is set to a single value.
9. The method for adding the RF powder according to claim 1 , wherein the plurality of RF powder particles included in the RF powder respond to different frequencies, and hence a plurality of frequencies are set.
10. The method for adding the RF powder according to claim 1 , wherein the appearance of the plurality of dummy RF powder particles mimics the appearance of the plurality of RF powder particles to inhibit a person from visually discerning between the plurality of dummy RF powder particles and the plurality of RF powder particles.
11. The method for adding the RF powder according to claim 1 , wherein the disposing the RF powder on the surface of the base sheet comprises disposing the RF powder in a pattern, and wherein the disposing the plurality of dummy RF powder particles on the surface of the base sheet comprises disposing the plurality of dummy RF powder particles on the surface of the base sheet in a manner that inhibits a person from visually discerning the pattern of the plurality of RF powder particles.
12. A radio frequency (RF) powder-added base sheet comprising:
an RIP powder including a plurality of RF powder particles disposed on a surface of a base sheet, wherein each RF powder particle includes a magnetic field coupling antenna circuit element comprising an inductive element and a capacitive element, and wherein the magnetic field coupling antenna circuit element is configured to respond to a high frequency electromagnetic field having a specific frequency; and
a plurality of dummy RIP powder particles disposed on the surface of the base sheet, wherein the plurality of dummy RF powder particles is configured to not respond to any electromagnetic fields, and wherein an appearance of the plurality of dummy RF powder particles mimics an appearance of the plurality of RF powder particles;
wherein the RF powder is disposed on the surface of the base sheet in a state in which the RF powder is included in a printed object.
13. The RF powder-added base sheet according to claim 12 , wherein the printed object has a specific color.
14. The RF powder-added base sheet according to claim 12 , wherein the printed object is a letter, a numeral, or a code.
15. The RF powder-added base sheet according to claim 12 , wherein the printed object is provided at both surfaces of the base sheet.
16. The RF powder-added base sheet according to claim 12 , wherein the RF powder is disposed so as to be embedded in the surface of the base sheet.
17. The RF powder-added base sheet according to claim 12 , wherein the plurality of RF powder particles included in the RF powder respond to the same frequency, and hence the specific frequency is set to a single value.
18. The RF powder-added base sheet according to claim 12 , wherein the plurality of RF powder particles included in the RF powder respond to different frequencies, and hence a plurality of frequencies are set.
19. The method for adding the RF powder according to claim 1 , wherein the magnetic field coupling antenna circuit element comprises a coil and a capacitor.
20. The RF powder-added base sheet according to claim 12 , wherein the magnetic field coupling antenna circuit element comprises a coil and a capacitor.
21. The method for adding the RF powder according to claim 1 , wherein the magnetic field coupling antenna circuit comprises a tank circuit, wherein the tank circuit comprises:
a first capacitor connected to a first end of a coil; and
a second capacitor connected to a second end of the coil.