Radiation imagery chemistry: process – composition – or product th – Imaged product – Antifraud or antitampering
Patent
1996-05-10
1998-11-03
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Imaged product
Antifraud or antitampering
283902, 283 93, 283 83, 283 84, 101490, 427 7, 427287, 427288, B42D 1500
Patent
active
058306099
ABSTRACT:
A paper substrate is laminated with a metalized layer forming a mirrored surface. A partially transparent black diffraction grating is applied by stochastic screening to the mirrored surface. The diffraction grating forms a frequency modulated pattern from selected geometric shapes. Information, such as alphanumeric indicia or graphics, is printed on the stochastic screen to thus form a reflective diffraction device which is printable in a conventional manner while inhibiting reproduction of the printed information by conventional techniques, including black and white and color photo-reproduction and facsimile machines. The partially transparent black stochastic screen forms a diffraction grating on the metalized layer so that when illuminated from the light source of either a specular or diffuse illumination-type photocopier, random interference patterns of light occur at the interface of the metalized surface and the stochastic screen. The diffracted light is not readable by a photocopier drum with the result that the indicia is not legibly reproduced. Thus, the indicia printed on the security document is protected from counterfeiting and unauthorized copying.
REFERENCES:
patent: 4303307 (1981-12-01), Tureck et al.
patent: 4420515 (1983-12-01), Amon et al.
patent: 4522429 (1985-06-01), Gardner et al.
patent: 4582346 (1986-04-01), Caprio et al.
patent: 4586811 (1986-05-01), Kubo et al.
patent: 4589686 (1986-05-01), McGrew
patent: 4603970 (1986-08-01), Aota et al.
patent: 4632429 (1986-12-01), Gardner et al.
patent: 4867481 (1989-09-01), Gundjian
patent: 5087507 (1992-02-01), Heinzer
patent: 5163088 (1992-11-01), LoCascio
patent: 5169722 (1992-12-01), Nakashima
patent: 5171040 (1992-12-01), Orndorff
patent: 5271645 (1993-12-01), Wicker
patent: 5290068 (1994-03-01), Gundjian
patent: 5297815 (1994-03-01), Anderson et al.
patent: 5301981 (1994-04-01), Nesis
patent: 5338067 (1994-08-01), Gundjian
patent: 5350199 (1994-09-01), Young et al.
patent: 5487567 (1996-01-01), Volpe
Hecht, Eugene; Optics 2d ed.; 1988, pp. 430-434.
Sears, Francis W. et al., University Physics; 1950; pp. 781-789.
Van Renesse, R. L., "Ordering the Order -- A Survey of Optical Document Security Features", SPIE Holography IX, San Jose, paper #2406-33, pp. 1-8, Feb. 5-10, 1995.
Chamberlain, Michael R., "Optically Variable Devices and Security Printing", Management and Technology, vol. 1, No. 6, pp. 12-15, Dec. 1995.
Stoffel et al. "Asurvey of electronic techniques . . . " IEEE Trans. Comm. vol. COM-29(12) pp. 1998-1925, Dec. 1981.
Bruce "Document Copy Prevention" IBM Tech. Discl. Bull. 18(1) p. 43, Jun. 1975.
Willard et al. "Instrumental Methods of Analysis" pp. 43-46, 1981.
Jenkins et al. "Fundamentals of Optics" pp. 355-373, 1976.
Lind John T.
Warner Richard D.
Angebranndt Martin
Graphic Arts Technical Foundation
LandOfFree
Security printed document to prevent unauthorized copying does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Security printed document to prevent unauthorized copying, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Security printed document to prevent unauthorized copying will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-687609