Information carriers with diffraction structures

Details Information carriers with diffraction structures Information carriers with diffraction structures

1996-06-17

1999-03-23

Henry, Jon

Optical: systems and elements

Holographic system or element

Authentication

359 22, 359 29, 359 33, 359567, 359569, 283 86, G03H 100, B42D 1500

Patent

active

058867988

ABSTRACT:
An information carrier has at least one diffraction pattern which is formed from microscopically fine relief structures and which, upon being illuminated with coherent light, produces in two spatially separate directions, a first and a second image of an object. The images can be rendered visible on a screen or analysed by means of photodetectors. The two images have strong-light and/or weak-light picture elements and includes a symmetry insofar as a weak-light picture element of the second image can be associated with a strong-light picture element of the first image and vice-versa. Such information carriers are suitable as security elements for documents of all kinds such as, for example, banknotes, passes, identity cards, credit cards, etc., wherein at least a part of the security information is not visible under incoherent illumination conditions.

REFERENCES:
patent: 4501439 (1985-02-01), Antes
patent: 4556378 (1985-12-01), Nyfeler et al.
patent: 4568141 (1986-02-01), Antes
patent: 4758296 (1988-07-01), McGrew
patent: 4840757 (1989-06-01), Blenkhorn
patent: 5032003 (1991-07-01), Antes
patent: 5059776 (1991-10-01), Antes
patent: 5101184 (1992-03-01), Antes
patent: 5106125 (1992-04-01), Antes
patent: 5426520 (1995-06-01), Kakae et al.
patent: 5486933 (1996-01-01), Shindo et al.

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