New holographic overlays

Anthony I. Hopwood

doi:10.1117/12.47108

1 October 1991 New holographic overlays

Anthony I. Hopwood

Proceedings Volume 1509, Holographic Optical Security Systems; (1991) https://doi.org/10.1117/12.47108
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands

Abstract

This paper discusses a new type of holographic overlay, FLASHPRINT, which may be used in both security and packaging applications. Unlike the more common embossed holograms currently used, FLASHPRINT leads to reduced set-up costs and offers a simpler process. This reduces the long lead times characteristic of the existing technology and requires the customer to provide only two-dimensional artwork. The overlay material contains a covert 2-D image. The image may be switched on or off by simply tilting the overlay in a light source. The overlay is replayed in the 'on' position to reveal the encoded security message as a highly saturated gold colored image. This effect is operable for a wide range of lighting conditions and viewing geometries. In the 'off' position the overlay is substantially transparent. These features make the visual effect of the overlay attractive to incorporate into product design. They may be laminated over complex printed artwork such as labels and security passes without masking the printed message. When switched 'on' the image appears both sharp and more than seven times brighter than white paper. The image remains sharp and clear even in less favorable lighting conditions. Although the technique offers a low set-up cost for the customer, through its simplicity, it remains as technically demanding and difficult to counterfeit as any holographic process.

Citation Download Citation

Anthony I. Hopwood "New holographic overlays", Proc. SPIE 1509, Holographic Optical Security Systems, (1 October 1991); https://doi.org/10.1117/12.47108

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