Method of preventing forgery of diffraction grating pattern and

Details Method of preventing forgery of diffraction grating pattern and Method of preventing forgery of diffraction grating pattern and

1992-12-10

1995-01-03

Ben, Loha

Optical: systems and elements

Holographic system or element

Authentication

356 71, 235457, 283 86, 380 54, G03H 100

Patent

active

053791312

ABSTRACT:
A method of preventing forgery of a diffraction grating pattern containing the record of specific information, and a forgery-proof diffraction grating pattern recording structure. Patterns (2.sub.1 to 2.sub.4), which are to be recorded, are recorded as diffraction gratings or interference fringe patterns, which comprise grating lines or fringes extending in a specific direction at a specific spacing and which are formed in respective pattern regions. Each of the recorded pattern regions is surrounded either entirely or partly with a region including a diffraction grating or an interference fringe pattern, which is different from the diffraction grating or fringe pattern in the recorded pattern region in terms of at least either the direction or spacing of the grating lines or fringes, thereby preventing forgery of the recorded diffraction grating pattern (1).

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patent: 4568141 (1986-02-01), Antes
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patent: 4856857 (1988-09-01), Takeuchi et al.
patent: 4913504 (1990-04-01), Gallagher
patent: 5059776 (1991-10-01), Antes
patent: 5200794 (1993-12-01), Nishiguma et al.

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