| 摘要 |
FIELD: printing industry. ^ SUBSTANCE: data protection device comprises an optically variable diffraction structure coated with scratch layers, lying above the data to be protected. Besides, the device comprises at least the first and the second non-transparent metal layers separated with a flexible light-absorbing separation layer. Invention also relates to a scratch card, which comprises such a device. ^ EFFECT: group of inventions provides for development of such a data protection device, which guarantees high non-transparency, even when a scratch foil is weakened. ^ 11 cl, 5 dwg |
