Diffractive device having a surface relief structure which gener

Details Diffractive device having a surface relief structure which gener Diffractive device having a surface relief structure which gener

1998-10-19

2000-07-11

Henry, Jon

Optical: systems and elements

Diffraction

From grating

359569, 359 2, G02B 518, G03H 108, G03H 126

Patent

active

060881615

ABSTRACT:
A diffractive device has a surface relief structure which when illuminated by a light source, generates one or more diffraction effects which are observable from a range of viewing angles around the device. At least part of the surface relief structure is arranged in a series of tracks, each track being less than 0.25 mm in width. The device, which may be embossed onto a metallised foil, is suitable for use as an anti-forgery authentication element on valuable documents.

REFERENCES:
patent: 4568141 (1986-02-01), Antes

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