The way to protect valuable papers and documents and device for its implementation
(57) Abstract:The way to protect valuable papers and documents to improve the efficiency of the protection is that in the process of applying to the surface or oral administration identifies substances perform spatial modulation of at least one parameter of the substance, affecting the characteristics of the recorded radiation. The device for implementing the method of protection of securities and documents to improve the efficiency of protection includes a means of modulation, in the form of mechanism with the Cam having a profile of the working surface, allowing at least one law of measure of the parameter of a substance at a given length of the paper. The device for implementing the method of protection of securities and documents to improve the effectiveness of the protection provided by means of a spatial modulation of properties identifying substances. 3 S. and 7 C.p. f-crystals, 5 Il. The invention relates to the field of protection of securities, receipts and other documents and can be used in the production of banknotes, bonds, checks, tickets, cards, documents and other securities with a high degree of protection against forgery.There is a method of protecting valuable b and rentgenophase and check verification securities significant changes, typically, x-ray attenuation (RI) (see, for example, the United Kingdom patent N 1585533, class D 21 H 5.10, 1976).Also known device for protection of securities and documents, including means applying on the basis of securities and/or document identifying substances using the mechanism for deposition (see U.S. patent N 4183989 in class. B 41 M 3/14, 1976).The implementation of these methods and devices can improve protection against fakes, but not able substantially to reduce the possibility of fakes.The closest in technical essence and the achieved when using the result is a method of protection against forgery of securities and documents, consisting in coating the surface or the inside rentgenogramma or other identifying substances, exposure to x-ray or other radiation and registration of changes in the radiation when compared with the reference judge the authenticity of the securities and/or instruments (see UK patent N 2062221, CL G 01 N 23/223 1980).The implementation of this method though, and you can protect your valuable papers and documents from counterfeiting, however, the effectiveness of this protection is very limited.
in Fig. 2 is shown a graph of the thickness of the coating identifies substances subject to the linear law;
in Fig. 3 - illustrates the nature of the change in the Fig. 4 - given an example implementation of a spatial modulation of the length L;
in Fig. 5 - shows an example implementation of spatial modulation in the square S.Spatial modulation is done with the use of the device (Fig. 1), which is carried on arbitrary, for example, the linear law (see Fig. 2). After registration, past RI produce a comparison of the law changes in the level of radiation with the reference law. As one of the parameters identifying substances applied on the surface or inside the body for securities and/or document, select the thickness of the substance.To improve the reliability of the protection provided by the ability to change the number and type of identifying substances, their total weight concentration and the ratio between the weight concentrations when applying them to the surface or the inside securities and document.Spatial modulation allows to implement a few more identifying characteristics: the presence of spatial modulation and nature (the law) it changes. Attempting to play (fakes) counterfeiter marker with spatial modulation would require the development of special technochem in the absence of such modulation. This is the main factor of increasing the efficiency of protection against forgery.Spatial modulation can be implemented in various technological methods. Below is the example describes several feasible options for its execution. They have not exhausted all the possible options for the implementation of spatial modulation.1st option
Dealing in securities, for example, the security thread is pre-applied metallic coating with varying according to a given coating thickness within a certain length (plot) thread. Such areas during the coating process is continuously repeated, and the length L is chosen from the condition that at least one site was within the banknote with the introduction of it security threads.You can implement this with the help of the device which is shown in Fig. 1.The security thread 1 leaves the roll 2 and is moving with linear velocity U. On the canvas threads is the spraying device 3 (for example, vacuum deposition) with a slit-like window 4 through which is applied to the canvas metal. The slit has the ability to move with variable velocity V, the law amended the law of variation of the thickness along the length L of the protective thread. For example, in the case of a linear law possible thickness profile of the metal layer can be the same as it is shown in Fig. 2. The value of the x-ray flux transmitted through the barrier thickness , is associated with the value of0the falling stream IL ratio
where is the linear attenuation coefficient of RI.Therefore, the change in f of the length L will obey an exponential law. The steepness of the exhibitors will be higher than and more (see Fig. 3).As the measured value may be a stream of fluorescent x-rays (see Afonina B. N., COMAC N. And., Nikolaev, B. N., Plotnikov P. I. x-ray fluorescence analysis. / Ed. by N. Losev.F., Izd-vo Nauka, Siberian branch, 1991).For thin coatings ( 0,1) thread fluorescence proportional RI . In this case, the shape of the curve f(L) at site L is similar to the profile change of the coating thickness in this area.The Cam can be made and versatile with different laws applying to the thickness of the metal coating on the length L. it is Clear that the number of such laws can be arbitrarily large.2nd option
To protect valuable paper or document well in the layers of specified dimensions ( L or S) entered rentgenophase substance. The weight concentration C rentgenophase substances in the paint can be constant (C = const) or change (C = var) from one of the paint layer to another.Applying layers of paint may be all known printing methods. In the case C = const variation absorbing properties of waste paint layer to another is carried out by changing the thickness of the layer, and in the case of C = var thickness of each layer may remain constant, but changes the concentration rentgenophase substances. The law changes or C on the length L or the area S can be chosen arbitrary. In Fig. 4 as an illustration presents one of the possible implementations of the length L of the described variant, and Fig. 5 - one of the possible implementations of the square S.The authenticity of the securities or document is set by comparing the reference according to the changes of the last thread on the length L or the area S and the corresponding dependence obtained by scanning x-ray protected area specific paper or document.the 3rd option
To protect valuable paper or document in the correct sequence within the selected area of a certain length L or the area S nano is their elements. The presence of these elements in the paint and the weight ratio determined by x-ray fluorescence radiation. In this embodiment, each ink layer ( L or S), you can change its thickness, the number entered in the paint layer identifying elements, their total weight concentration and the weight ratio between them. Any of these parameters affects the flux of fluorescent radiation identifying each chemical element. To reproduce the security token with such multivariate spatial modulation would be extremely difficult.The use of the present invention will allow on an industrial scale to solve the problem of protection against forgery of securities and documents. 1. How are sewn securities and documents, consisting in coating the surface or the inside rentgenogramma or x-ray fluorescence identifies substances, exposure to x-ray registration of parameters of x-ray radiation and comparing them with reference values, the results of which are judged on the authenticity of securities and documents, characterized in that in the process of applying to the surface or oral administration and, affecting the characteristics of the recorded radiation.2. The method according to p. 1, wherein the spatial modulation is performed in arbitrary law and register the corresponding law of change of the measured parameter of x-ray radiation for subsequent comparison with the reference law.3. The method according to p. 1, characterized in that as the adjustable parameters of the substances applied to the surface or inside the body for securities or document may be their type.4. The method according to PP.1 and 3, characterized in that as one of the parameters of substances can be used their number.5. The method according to PP.1 and 3, characterized in that as one of the parameters of substances can be used their thickness.6. The method according to PP.1 and 3, characterized in that as one of the parameters of substances can be used, their total weight concentration.7. The method according to PP.1 and 3, characterized in that as one of the parameters of substances can be used, the ratio between the weight concentrations.8. The device for implementing the method of protecting valuable papers and documents, including a means of drawing on their postulatio one of the parameters substances, characterized in that the modulation means in the form of mechanism with the Cam having a profile of the working surface, allowing at least one law of measure of the parameter of a substance at a given length of securities or document.9. The device under item 8, characterized in that the modulation means one of the parameters of the substances provided with a mechanism for changing the thickness on the surface or inside the body for securities and/or document identifies substances.10. The device for implementing the method of protecting valuable papers and documents, including a means of drawing on their surface or oral administration identifies substances within at least one area defined areal dimensions, characterized in that it is provided with a means for spatial modulation of identifying properties of substances, their type, the thickness of the layer, the total weight ratio between the weights of substances, the number of parts that affect the parameters of x-ray fluorescence radiation.
FIELD: information medium sealed up by the method of metallographic printing, method for its manufacture, as well as a printing plate suitable for the purpose and the method for its manufacture.
SUBSTANCE: the information medium, first of all a bank note, securities or a similar document, which has at least one sealed up section (13) and at least one separate section (14) practically completely encircled by this section. The mentioned section (13) and the separate section (14) are sealed up by the metallographic method, and both sections are sealed up by paint coats of a different thickness and differ from one another.
EFFECT: provided a high degree of protection against forgery of the information medium.
21 cl, 11 dwg