Switchon-switchoff, multistate, interactive,...

G - Physics – 03 – C

Patent

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G03C 5/08 (2006.01) G03G 21/00 (2006.01) G03G 21/04 (2006.01)

Patent

CA 2079672

A method and apparatus for preventing reproduction of printed matter on a substrate by photocopying, telefaxing and the like. A substrate is provided with at least one main surface and a photochromic dye is applied to the one main surface, wherein the dye changes color in response to exposure to light with a response time which is a function of the amount of light absorbed by the dye in a given time period. The one main surface is illuminated with a given amount of light and the response time is decreased to accelerate the change in color of the dye by increasing the proportion of light which is absorbed by the dye from the given amount of light.

Méthode et appareil permettant d'empêcher la reproduction par photocopie, télécopie, etc., de ce qui a été imprimé sur un certain substrat. On fournit un substrat ayant au moins une surface principale sur laquelle on applique un colorant photochrome susceptible de changer de couleur lorsqu'il est exposé à la lumière avec un temps de réponse qui est fonction de la quantité de lumière absorbée par ce colorant au cours d'un laps de temps donné. On éclaire la surface principale d'une quantité de lumière déterminée et le temps de réponse est raccourci pour accélérer le changement de couleur du colorant en augmentant la proportion de lumière absorbée par ce colorant par rapport à cette quantité de lumière déterminée.

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