| 摘要 |
PURPOSE: A sheet for protecting RF(Radio Frequency) card duplication recognition is provided to be used with the various sizes of wallets by being appropriately cut and forming several cut-out lines which are vertically and horizontally crossed in one sheet. CONSTITUTION: A shielded area(12) is composed of an electromagnetic shielding film. An unshielded area(14) is formed along one end of the long side(16) of a sheet(10). The length of the short side of the sheet is corresponded to the length of the short side of a paper money. The length of the long side of the sheet is a 0.5-1.2 times of the length of the short side of a paper money. At least one side of the surfaces of the sheet is coated with an electromagnetic wave permeable material. |
