| 摘要 |
<p>PROBLEM TO BE SOLVED: To manufacture a hologram sheet of high visuality hard to be forged or duplicated. SOLUTION: Hologram patterns are formed on a hologram sheet by a heat source or electromagnet radiation, and a metal layer on which melting or sublimation is generated by the heat source or electromagnetic radiation is formed on a thermoplastic base. In that case, laser beams are used as the heat source or the electromagnetic radiation. A metal of the metal layer formed on the base is formed of one or more selected bismuth, zinc and titanium, and the thickness of the metal layer formed on the base is 5-500 nm.</p> |
