Improvements relating to the manufacture of articles carrying reflective holograms.

摘要

A hologram is produced on a metallic surface of an article coated with a transparent thermoplastic material by impressing a holographic image into the metallic surface either before the application of the coating or through the coating. The metallic surface may be a smooth matt surface but is preferably a specular or bright surface and may be produced by metallization or vacuum deposition or electroplating on paper or card articles. Alternatively the article may have a surface layer of tin or other relatively soft metal applied to it to form the surface into which the holographic image is impressed. The plate bearing the holographic negative may be heated to assist in impressing the image into the metallic surface. In another method an article is coated with an opaque thermoplastic material and a holographic image is then impressed in the surface of the opaque coating.