Copy prevention method

Details Copy prevention method Copy prevention method

1999-11-29

2000-08-22

Moses, Richard

Electrophotography

Document handling

Original

283902, 380 3, 355133, G03G 2104

Patent

active

06108512&

ABSTRACT:
A system for producing non-copyable prints. In a xerographic printer, text is printed using clear toner. Thus, the only optical difference between toner and non-toner portions of the page is in the reflectivity. The plastic toner will reflect more light than the paper. A human reader can now read the image by holding the page at such an angle that the eye will intercept the reflected light from the toner, producing a contrast between the lighter appearing toner and the darker appearing paper. However, a copier scanner is always set up to avoid reflected light, by supplying light at an oblique angle and reading at a right angle. In this case the diffused light is approximately equal for both toned and untoned surfaces, the scanner will detect no difference and the copier will not be able to copy the original.

REFERENCES:
patent: 5087507 (1992-02-01), Heinzer

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