Semi-transparent reflective hologram and method of producing sam

Details Semi-transparent reflective hologram and method of producing sam Semi-transparent reflective hologram and method of producing sam

1996-12-16

1998-07-14

Nguyen, Thong

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 2, 359 35, 283 86, 427162, G03H 102

Patent

active

057813167

ABSTRACT:
A semi-transparent holographic transfer foil film for application to a substrate such as a security device. The film is comprised of a thermally stable carrier for supporting multiple layers of thermoplastic or thermoset coatings, wherein a heat sensitive release layer is applied to the carrier to enable separation of the carrier from the multiple layers of coatings under appropriate circumstances. A wear-resistant transparent top coat is applied over the release layer to act as an outer surface for the holographic film, the top coat may be treated or cured so as to increase its tenacity. An embossable coating is applied over the top coat, and is adapted to retain the impression of a holographically embossed image. A semi-transparent reflective layer of zinc sulfide is applied over the embossable coating for reflecting the holographically embossed image while at the same time enabling indicia found on a substrate or document to which the film will be applied to be viewed. A surface relief pattern is impressed within the reflective layer and the embossable coating to form the holographically embossed image or diffraction pattern. An adhesive coating and tie coat are applied over the other coatings for adhering the semi-transparent holographic film to the substrate.

REFERENCES:
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 5145212 (1992-09-01), Mallik
patent: 5184848 (1993-02-01), Itoh et al.
patent: 5351142 (1994-09-01), Cueli
patent: 5513019 (1996-04-01), Cueli

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