| 摘要 |
PROBLEM TO BE SOLVED: To provide a new hologram sheet using a hologram, in which a hologram is reproduced at a wavelength different from that of illumination light so as to enhance the authenticity of the hologram sheet, unlike a hologram for reproducing a hologram image at the same wavelength as that of illumination light.SOLUTION: A hologram sheet having higher counterfeit prevention property is obtained by disposing a fluorescent layer on a hologram forming layer and illuminating the sheet with light that excites a phosphor in the fluorescent layer in such a manner that a hologram image reproduced in a tone in a visible light region by the fluorescent emission can be visually checked. |
