Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1985-11-18
1988-11-22
Echols, P. W.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
283 85, 283 87, 283902, G03H 124, G03G 2100
Patent
active
047860847
ABSTRACT:
The present invention is directed to a photocopy prevention film applied to a document to be protected that comprises either a volume holographic refraction grating or a surface holographic refraction grating. The refraction grating is bonded to a document and either causes normally scattered light to be focused toward the photoreceptors of a photocopy machine or causes light normally reflected toward the receptors to be scattered away from the receptors. The film is created by splitting a coherent laser beam into a reference beam and a target beam. The target beam reflects off of a special target and onto a photographic emulsion. The reference beam is also incident to the photographic emulsion. The beam reflected from the target and the reference beam create interference planes within the emulsion which can be developed to create differing refractive index planes within the emulsion or etched away to create a surface grating. The beam and target can cause the film to scatter or focus the light depending on whether saturation of the photoreceptors or black-out of the photoreceptors is desired.
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patent: 4501439 (1985-02-01), Antes
"A First Review of the Properties of Volume Gratings", Volume Holography and Volume Gratings, L. Soly Mar and D. J. Cooke, Academic Press, 1981.
Collier et al., Optical Holography, Academic Press, N.Y. (1971), pp. 12-22.
"White-Light Transmission Holograms", Stephen A. Benton, Res. Lab., Polaroid Corp. & Arts and Media Technology Program, Mass. Inst. of Tech. 1983.
"Formation of Optical Elements by Holography", Sincerbox, IBM Technical Disclosure Bulletin, vol. 10, No. 3, pp. 267-268, 8/1967.
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"Anti-Copy Paper", Bealle et al., IBM Technical Disclosure Bulletin, vol. 26, No. 5, pp. 2319-2320, 10/1983.
Handy Roland
Karney James L.
Copyguard, Inc.
Echols P. W.
Ross Taylor J.
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