Latent images comprising phase shifted micro printing

Details Latent images comprising phase shifted micro printing Latent images comprising phase shifted micro printing

1991-06-25

1993-01-12

Eley, Timothy V.

Printed matter

Having revealable concealed information, fraud preventer or...

Cryptogram

283901, 380 55, B42D 1500

Patent

active

051784181

ABSTRACT:
A security device comprising a substrate having applied thereto an array of characters, the characters being of a sufficiently small size as to appear uniform when ordinarily viewed but individually identifiable when viewed with the aid of appropriate magnification means, whereby group(s) of the characters are phase-shifted relative to the others in such a manner as to collectively define an image, the image being relatively indiscernible when the device is ordinarily viewed but discernible when viewed with the aid of a finding screen.

REFERENCES:
patent: 3675948 (1972-07-01), Wicker
patent: 4998010 (1991-03-01), Chandler et al.

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