| 摘要 |
A method for irreversibly transferring a diffraction grating such as a hologram stamped onto a substrate (21, 23) such as a document or article to be protected. The method comprises preparing a transfer film (24) consisting of a carrier film (1) supporting at least one protective lacquer layer (4), a metallised or transparent reflective layer (5) comprising the stamped optical image, and an activatable adhesive layer (6). The resulting transfer film (20) is then pressed onto the substrate using a transfer tool. The step of preparing the transfer film (20) comprises applying at least one optical element (8) onto a carrier film (1) which is larger than an element to be transferred, said optical element being exactly the same size as the element to be transferred onto the substrate (21, 23). The transfer tool engages a portion of the transfer film (20) that is larger than the area corresponding to the element to be transferred. A transfer film and a tool for carrying out the method are also disclosed.
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