UA44767C2 - METHOD AND DEVICE FOR VERIFYING DOCUMENTS PROTECTED AGAINST COUNTERFEIT - Google Patents

Abstract

The invention concerns a method and devices for checking security documents. According to this process which uses known capacitive coupling, electrical signals are transmitted by transmitting antennae via electrically conductive security features to receiving antennae and amplified. The amplitude responses and time characteristics of the electrical signals are then evaluated and compared with existing signal responses, by being converted into signal responses having easily comparable parameters. In order to enable the testing arrangement to be specifically selective, a selective amplifier is additionally coupled to the evaluation electronics. Currency-specific definition by means of the evaluation electronics according to the invention is attained in that, for a given currency, a time limit of the test signal amplitude can be determined by means of controllers, for example, this time limit differing from the duration of the amplitude response of all the other currencies.

Description

Description of the invention

The invention relates to a method and devices for controlling the protection of documents against forgery. 2 Known diverse methods, devices, methods and systems! controls for determining the authenticity of documents protected against forgery, for tracking functional suitability, for determining the position in processing machines, as well as for sorting and counting documents. In the description of the German patent

OE-RBZ 1223594 disclosed a device for capacitive reading of data carriers, which has a reading capacitor! implementations in the form of sensor electrodes located on both sides of the track of the 710 data carrier. Reliability of reading from this device is not guaranteed in relation to embedded, pressed or applied on the surface of electroconductive strips, tapes or similar particles.

In the description of the invention to the patent FRG OBE-RB 1774290, a measuring circuit is presented for automatic evaluation of a characteristic feature of a banknote in a device for checking the authenticity of banknotes with the help of a capacitive connection of electrodes, which are placed in the form of a grid. The known 72 measuring scheme at the processing speeds required today does not provide an accurate determination of the corresponding characteristic feature, and although it establishes the presence of the corresponding distinguishing feature during a slow control process, it is not able to determine the currently known forgeries when using electroconductive elements, for example in banknotes.

From the published application of FRG OE-O5 2619457, it is known to measure the magnetic properties of the protective strip placed in the banknote.

Control of the authenticity of ferromagnetic protective strips in banknote value impressions using the application of a magnetic field is described in FRG patent OB-RB 2834287. These control methods are too slow and often require precise positioning of the controlled object or the control strip.

Invented according to the German patent OB-P5 2760165, a technically labor-intensive device for verification is described, in which the authenticity of banknotes is determined, mainly, at the second stage of control, and the thickness difference and fluorescent properties are measured. Checking only those properties no longer corresponds to the level of fake banknotes in circulation. The device can no longer detect fake money with watermarks and on fluorescent paper or with fluorescent paint.

And the description in the enclosed applications of FRG OBE-O5 3236373 and 3236374 of reading heads on 30 processing machines, which, in combination with labels on documents protected against forgery, form an "electric capacitor" and due to the introduction of a ferroelectric between the capacitors and electrodes of the reading device, change the value of the capacity in a certain way , also not suitable for use on - high-speed processing machines and for control of European /-«f banknotes in circulation today.

From the Discovery of an electrically conductive protective thread by matching generators and oscillatory M contours according to FRG patent OE 2912712 due to the low reliability of estimates and significant technical complexity and design complexity, it did not find practical application.

US patent 5,308,992 describes a measuring device containing optical and capacitive sensors, which, however, requires very precise positioning of the control strip. In order to increase the level of accuracy by 40% and the possibility of distinguishing various controlled objects (for example, from different currencies), the additional use of a magnetic sensor is proposed, which makes the measurement design even more complicated and expensive. The capacitive sensor, after preliminary sorting of banknotes, indicates only the presence of a conductive protective thread.

Also known is the control device according to the FRG patent OE 4103832, in which capacitive and/or electro-optical sensors and/or millimeter wave sensors for control are located along the control track 45. The object of this invention is, in addition, to check the dielectric characteristics of banknotes. "" FRG patent OE 43 25 027 describes a method and device for checking the authenticity of banknotes, and when the high-frequency field is covered with a metal protective strip, the changes occurring in 7 field parameters are estimated. The introduction of such a device into a bill-counting machine is possible only at low speeds b 20 due to low sensitivity and a large influence of interference. Therefore, conducting on the plane and wet control objects are recognized as genuine. Cracks in the metal strips of genuine banknotes are not recognized, which leads to erroneous stops of the machine. Due to the low sensitivity of the device, the distance between the electrodes and the metal protective threads of the banknotes! very little, which prevents its use in high-speed processing machines. Installation of several sensors is possible only at relatively large distances in relation to each other, so that! sensor! did not show a friend on

GF) second influence.

In the international publication UUO 94/22114, a device for recognizing metallic or conductive protective threads is described. However, even in that device, the conductive object on the plane and the wet object of control are recognized as genuine, because that is, it is carried out as a measurement of the electrical load of the electrodes of 60 sensors. Classification of protective threads of different sizes is not provided. European application EP 0 204 574 describes a method of identifying magnetic printed marks using electromagnetic induction.

Because it's an ordinary copier! can be supplied with magnetic paints, then such a control method has very limited reliability with the modern quality of fakes.

Disadvantages of these well-known methods of control and devices for their implementation are, first of all, their technical complexity and insufficient reliability to ensure the detection of counterfeits at a high speed of movement of banknotes in processing machines. The disadvantages of known measuring systems for monitoring capacitive characteristics include the fact that in them a sufficiently low capacitive resistance is achieved only in the specified low frequency bands from 10 to 220 kHz and only at very small distances between the electrodes and the metal thread. In addition, in this frequency range, the influence of dielectric change is still very large, i.e., a substance with a large dielectric permeability leads to an increase in capacitance and, therefore, to a decrease in capacitive resistance between antennas. For example, a wet fake banknote can be mistaken for a real one. Ask for schemes! so far, in practice, especially with machine verification of authenticity, they have not justified themselves. 70 In the European application EP 589 195 A? the method by which to check the authenticity of controlled objects by reading and scanning the zone is described! magnetic elements with high magnetic permeability, the received detection signal comes thanks to a device with an excitation coil and a receiving coil in the form of an identification code, and then the authenticity is confirmed by the coincidence of the detection signal with the identification code. This control method is suitable for use only for plastic cards, 7/5 paper documents and only for a few non-European banknotes with magnetic or magnetizable particles applied to them. Another way! control, as described in European applications EP 204574 A2, 553402 A7 and 560023 At, in which the geometric and/or physical characteristics of controlled objects are classified by the method of comparison, can sometimes be used only for one or another type of controlled object, but they are very labor-intensive and in practice are not used in high-speed processing machines as the only method of checking the authenticity at a separate stage of banknote processing.

The task of the present invention is to eliminate the existing shortcomings of known control devices and methods. For this reason, a method is proposed, with the help of which it is possible to reliably recognize a characteristic control sign for many types of banknotes and currencies, capable of distinguishing them even, for example, if the controlled object! wet or intentionally wet! and/or stains; not requiring serious technical complications, and at the same time, its application is possible in the form of retrofitting processing machines, as well as corresponding to the high-speed operation of processing machines. A conductive protective thread or ribbon, or a flat protective mark on banknotes or securities is used as a characteristic control sign. A further task of the invention is to create such a control device for the implementation of the method, which can be pre-activated so that! before sorting by types of currencies and types of documents, it will already perform an authenticity check. X,

The task of the invention for the implementation of the method is further to create a device for checking the protection against forgery of documents that, as a protective element, contain an electrically conductive strip in the form of a ribbon or a thread with continuous electrical conductivity, or such strips on which there are several electrically insulated friends from the second section. An example of such a protected from -("To forgery of a document are modern banknotes of the USA, in which there is a protective electroconductive thread on the electroconductive thread, but the markings are isolated from each other. In modern practice, it becomes necessary to install such control systems! which they not only recognize high-quality forgeries as such, but also reveal genuine documents of lower quality, since in practice they occur quite often and lead to falsehoods in operations, which significantly interfere with the work of processing machines.

According to the invention, the method of controlling protection against forgery of documents along with;" using the already known capacitive connection provides that electrical signals! from the transmitting antennas are transmitted through the electromagnetic shielding of the tags to the receiving antennas and are amplified, and then their amplitude and time characteristics are estimated, which are compared with the already available "5" characteristics of the signals, and they are transformed into the characteristics of the signals, which have an easily comparable parameter!. To implement the method with its technological operations described in more detail below, a control device for banknotes, documents, securities, etc. application, for example, in a machine for processing banknotes, mainly in a counter

Me. banknotes Controlling sensor equipment is placed on the body structural unit in the form

And optical and/or magnetic sensors and/or format sensors. The machine passes the banknote! and/or securities past that control device. The monitoring sensor equipment consists of several antennas and/or electrodes. Antennas and/or transmitters, located across the direction of transportation of inspected objects; have such a planar extension that even with a certain lateral displacement of the tested objects and regardless of whether the tested object is turned up front or (Ф, reverse side), passing through the control device, in any case, the protective strip or thread crosses the antennas or electrodes in the right way The antennas and/or electrodes of the control device correspond to known sliding devices, pressure rollers and/or transport booms, so that a certain distance is maintained between the checked documents and the antennas when they move rapidly, and/or they are pressed against the electrodes. Thanks to the connection of the control device according to the invention, in the area of the location of optical and/or magnetic and/or format sensors, which generally serve to recognize geometry, position, color, etc., the controlling sensor equipment is simultaneously activated. 65 One or more antennas and/or electrodes are fed high-frequency and/or low-frequency energy and/or constant voltage, and one or more antennas and/or electrodes receive part of the radiated energy through a protective strip or thread. At the same time, the applied voltage changes on one or more receiving antennas and/or receiving electrodes.

In order to have the possibility of obtaining comparable control answers, for example, on reliability, on Zkspluatatsionnoy suitability of documents or the value of banknotes, the objects to be compared are necessary! constant conditions of their passage, such as, for example, speed. Antennas and/or electrodes supply voltage to the decoding electronics (unit). Deciphering electronics shows an easily comparable voltage depending on the form! received voltage signal. In order to suppress extraneous energy and interference, as well as to eliminate the influence of the electrical conductivity of the base of the controlled objects on the result of the measurement, it can be used! special filter! and/or phase matching schemes.

The input pulse of the decoding electronics does not depend on the speed of movement of objects. To ensure the specific selectivity of the control device, a selective amplifier is additionally connected to the decoding electronics. The selective amplifier converts the voltage supplied by the controlling sensor equipment into an easily comparable voltage, which depends on the amplitude /5 characteristic of the received voltage. Depending on the category (electroconductive protective strip or protective thread, or any electroconductive marking), additional limits of amplitudes are set when setting the decoding electronics, which are so close to the amplitude deviation of the control signal that when the difference between the clearly established amplitude limit and the largest possible deviation of all The authenticity of the inspected objects is determined. This means that even the newest fakes, which give a signal that would be casually perceived as a decoder signal, are determined by the decoding electronics of that invention as a fake.

Currency-specific adjustment with the help of decoding electronics according to the invention, for example, for all banknotes of individual countries with the same protective strips, according to the invention, is achieved by the fact that the time limit of the amplitudes can be determined for the currency, for example, with the help of controllers! with the control signal, which differs from the duration of the amplitude characteristic of all other currencies.

In the case of currencies with the same duration of the control signal, an additional check is carried out, i) for example, for color recognition and/or for differences in color and/or check by the format control method and/or magnetic method. For example, we send a signal with photocells! the recognitions are connected to the signal from the control sensor equipment according to the invention, and are processed into an output pulse characteristic of machines.

Another variant of the method consists in including one or more pairs of transmitting antennas with x-shift, phase shift. Thanks to the capacitive connection of one of the transmitting antennas with one of the conductive marks on the protective strip and the connection between the transmitting antenna and the receiving antenna located opposite it, an authentication signal appears at one of the inputs of the amplifier. From the second transmitting antenna - z5, which is coupled to the first one with a phase shift, there is no capacitive connection of the signal with the receiving antenna, since there is no electroconductive protective strip in the interaction zone.

Thus, thanks to this scheme, it becomes possible to control a continuous electrical strip. With a shift relative to those antenna pairs, the other pairs of transmitting and receiving antennas are located, which in terms of their sizes and distances are coordinated with the electroconductive marks and the protective strip. When the controlled object is moved to a certain distance, specific signals of amplitude and time are transmitted to the controlling sensor equipment, and the same/m - . signals! for decoding from receiving antennas to decoding electronics. Thus, a check is carried out, which can recognize several isolated electroconductive labels from each other and decode them accordingly. At the same time, it does not matter whether the isolation between the electromagnetically conductive marks is intentionally created, as for example on the US banknote, or it is caused by gaps in the manufactured through electromagnetic protective strip, as for example on German banknotes. The microcontroller can compare the number of these gaps with the values recorded in the memory. Thanks to the installation of several pairs of transmitting and receiving antennas and the corresponding decoding electronics, it was possible to receive a reliable message about the authenticity of the document, since despite the possible lateral shifts when the inspected object is brought to the control device, it works reliably. If, according to

According to the invention, the transmitting and receiving antennas are located along the entire working width of the processing machine, so it is possible to check the authenticity of documents protected against forgery, independent of the position.

Therefore, it does not matter whether the document is fed front or back, and/or has a protective strip on the left or right, or is moved with a shift across the direction of transportation. Because of this, documents that may differ both in format and in the location of the protective strip relative to the direction of transportation become controlled. In addition, thanks to (F), different types of security strips allow not only classification of authenticity, but also special identification of different documents, for example, different currencies.

During the transportation of banknotes, it is possible to place additional control sensors (additional sensor equipment) before and/or after the main control devices. In this case, the output signal from the system! sensors are connected to the output signal of the controlling sensor equipment according to the invention (double control), without the need to introduce changes in the software for the corresponding processing machines), for example, when retrofitted with a control device corresponding to the invented method. 65 The preferred features of the invention are not contained only in the formula clauses! inventions, but also in the description and drawings, and sometimes separate features by themselves, or combined in the form of subordinate combinations, represent a protective option), for which patent protection is provided here. Try it! implementation of the invention shown in the attached drawings. In the drawings of the readings: in fig. 1: Block diagram of the decoding circuit; in fig. 2: The recognition curve when passing a banknote at different speeds; in fig. 3: Currency-specific curve recognition; in fig. 4: Curve of recognition of several banknotes and counterfeits; in fig. 5: Block diagram of the decryption circuit with double control; in fig. 6: Schematic view of the control device in section; 70 in fig. 7: Controlling sensor equipment; in fig. 8: Block diagram of the control device; in fig. 9: Placement of the controlling sensor equipment! processing machine.

The method described in more detail using various devices and schemes is mainly based on the following technological operations: capacitive coupling of electrical signals from transmitting antennas through conductive protective material! to receiving antennas, amplification and transformation of their received signals, which differ in amplitude and time characteristics, into easily comparable signals and their comparison with already known parameters of the signals in order to demonstrate and decode the authenticity of the verified documents in the appropriate form. Connected to the control device, the machine feeds a banknote! or more than 2 pieces of paper in the zone of the control device. Photo element! immediately activate the controlling sensor equipment.

The transmitting antenna is fed with high-frequency energy. In the considered example of execution - with a frequency of 6 MHz. If the protective strip or thread passes through the control field, the receiving antenna receives part of the radiated energy. That changes the high-frequency voltage applied to the receiving antenna. The reason for this to a certain extent is the capacitive connection between the transmitting and receiving antennas based on the electrical conductivity of protective strips or threads. High-frequency i) conductivity of individual bills is different. Everything is possible with the help of deciphering schemes! to receive answers typical for currencies, stable conditions of transportation of all objects to be checked for one working operation are required. with the control unit and its controlling sensor equipment in the functional unit there is a decoding electronics consisting mainly of serially connected analog-to-digital signals, a converter and a controller or integrator 15, a trigger 16, a controller, a monostable and multivibrator 17, as well as , according to the selection of the logical element I 18, to the second input of which the block 19 of the additional check is connected. All elements of the connection are shielded conductors. Possible - z5 decoding electronics is presented in fig. 1 in the form of a block diagram. "Mr

Position 12 denotes the high-frequency transmitter, 13 the high-frequency receiver, which receives the energy reflected from the receiving antenna 9, in the selective amplifier 14 amplifies the authentic signal characteristic of currencies and/or useful, 15 - the integrator, 16 - the trigger, which, in addition to the available signals, receives signals, activating the decoding circuit of the photocell 20 and transmits through the mono-flop 17 in the form of "synchronized pulses" as an input signal for recognizing the identity of controlled objects. As can be seen from the indications in fig. 4 curves a and b when passing banknotes, not a single signal of counterfeits 26 comparable to the signal of recognized genuine banknotes was given. ;" Mandatory shielding of the monitoring sensor equipment and decoding electronics from electric and electromagnetic fields, as well as placement of the monitoring sensor equipment! in the area of photocells, they provide a high noise-to-useful signal ratio and, in combination with the forced feeding of documents by conveyor belts and at a given rate of passage of banknotes, they guarantee currency-specific selectivity of the control device. The next advantage of the method is that, for example, the moisture content and/or the degree of contamination of the controlled objects and/or banknotes and/or securities are no longer the main sources of interference.

In fig. 6 schematically shows the control device in section, which is used in the machine for

Me. banknote processing, mainly in the banknote counter, according to the method described above. On the hull

And the structural unit 1 is the machine holder 2, on the horizontal shelf of which the monitoring sensor equipment is installed, located in the area of the photocells 4 and 5 on the non-conductive carrier material 6 of the horizontal shelf 3. The carrier material 6 has notches and/or through holes 7 for the passage of light photoelements 4 and 5. These notches and/or holes 7 are not required if a carrier material 6 transparent like glass is used. : strip sensor 8 as a transmitting antenna! and strip sensor 9 as a receiving antenna. The strip sensors 8, 9 across the direction of transportation of banknotes 11 have such a longitudinal length that even with a given lateral gap of the banknotes 11 and regardless of whether the banknote is turned 11 with the front side up or down when passing through the device, in any case, the protective strips or threads in sufficient exact degrees cross the strip sensors 8, 9 and pass under them through the control device. A conveyor belt 10 runs parallel to it below the horizontal shelf at such a distance from strip sensors 8 and 9 that! with a rapidly passed banknote! you 9 were clinging to 65 PPoloskov sensors.

Photocells 4, 5 are located between the conveyor belts 11 perpendicular to the direction of the banknote passage.

The decoding electronics are also located in the shielded zone of the processing machines (in this example of execution - purposefully in the zone of the casing, for example, where the regulation device is located in response to the density of the paper).

The specified shielding of the controlling sensor equipment and decoding electronics from electric and electromagnetic fields, as well as the location of the controlling sensor equipment! in the area of photoelements 4, 5, they provide a good noise/useful signal ratio and, in combination with the forced feeding of documents by conveyor belts 10 at a given speed of passage of 7/0 banknotes, guarantee currency-specific selectivity of the control device. The next advantage of the device according to the invention is that, for example, the moisture content and/or the degree of contamination of the controlled objects are no longer the main sources of interference.

In the directional transportation of banknotes - not shown in this example - additional sensor equipment can be attached to the control sensor apparatus according to the invention, for example for /5 magnetic control, placing it before and/or after it, as shown in fig. 5.

In this case, the output signal of the sensor equipment is combined with the output signal of the control sensor equipment according to the invention (dual control without the need to change the software for the corresponding processing machines), for example, when retrofitted with a control device according to the invention.

The decoding electronics connected to the controlling sensor equipment and photocells, as shown in fig. 2 and З, the voltage depends on the amplitude characteristic of the received high-frequency voltage. The above-mentioned figures confirm the transmission of the signal, presented on the curves a.

In fig. 2 shows curve recognition when passing a banknote at a different speed. c Curve a shows the transmitted signal, and curve p - the output signal of the decoding electronics.

The value of mia corresponds to the speed of passage of 500 banknotes per minute, and mo - the speed of passage of 1800 i) banknotes per minute. In addition, curve B explains how the banknote recognition signal is presented! is connected with the signal from the controlling sensor equipment, and how it is transformed into an input pulse characteristic of machines. The output pulse, as shown by the comparison of curves B in fig. 2, does not depend on M. on the speed of passing banknotes.

In fig. From performances! specific to a specific currency! the curve of recognition when passing X, banknotes of various denominations. Curve a again shows the signal transmitted from the controlling sensor equipment, while curve B shows the decoding signal of the selective amplifier, which was additionally connected to the decoding electronics to ensure currency-specific selectivity of the control device without additional sensors. "Mr

In fig. With designation symbols: OE German currency, SN Swiss currency, EC Egyptian currency, CM Chinese yuan, starting with the 1990 series.

The amplitude characteristic of the received high-frequency energy, differently formed by the various protective strips in banknotes of various currencies, is clearly recognized and, thus, "received by the deciphering electronics." If there is a need to process the signal characterizing 2) with the currency, then it is possible to additionally prepare the signal for the classification of currencies by deciphering electronics, for example, with the help of a controller. Just as different currencies can be distinguished;" thanks to various protective strips or threads, fakes can also be recognized, since they contain fake protective strips or threads or only their fragments. Fig. 4 shows! curve of recognition of eleven banknotes in one machine for counting money. Banknotes digitized from 21 to 25 and those from 27 to 31 can be recognized as genuine. The monitored object Mo 26 is a fake that was intentionally placed for the purpose of the experiment. due to the lack of a protective strip or a fake protective strip, the monitoring sensor equipment did not receive a signal. In practice, if there is no signal or if a signal that is not typical for banknotes appears, the processing machine stops, and the fake or unusable banknote is removed or mechanically separated and put aside.

Me. If the control device is additionally connected to another control sensor equipment,

And that is typical for cars! the output pulse shows the recognition of this or that protective strip or thread and is combined with the output signal of the additional check of the processing machines! through logical element I. If one of those two authenticity signals is missing, the machine stops, and the operator can withdraw a defective or fake banknote.

The second possibility of application with the corresponding setting of the decoding electronics is created by (F, the account of the decoding signals of the selective amplifier, as shown in Fig. 3. If, for example, in larger processing machines, which are also used for the purposes of sorting different currencies, the amplitude limit A is exceeded for of all controlled currencies, when reading the protective strip or threads by the control sensor equipment, they are recognized as genuine. Each currency corresponds to its own characteristic time. To distinguish a separate currency), you should set the time assigned to the currency (К : Ц.../ и до and as characteristic of currencies! k.

For example, it is possible to set more German currency than Swiss francs or select more Swiss francs than Egyptian currency. Because it is the German currency! it should be vibrated on 65 Possibilities the same as those shown in fig. For currencies, one more currency-specific check is required using a known color and/or format recognition method and/or a magnetic control method within the processing machine. Sorting in this way separates currencies! in a certain way they are laid out in boxes or stacks.

Processing machines are equipped with monitoring sensor equipment 54, as shown in fig. 7, mainly for the control of non-transparent conductive protective strips of documents. This sensor equipment consists of several transmitting and receiving antennas, which arrangement! parallel to each other and perpendicular to the direction of transport of documents. To check banknotes! are sent in a common stream to a processing machine, for example, to a conveyor device in a machine for counting banknotes in such a way that the protective strip or thread in the banknote is located on its longest 7/0 section approximately parallel to the direction of movement, therefore, for example, a German banknote its longest part lies roughly across the direction of movement. Transmitting antennas A2, AZ, as well as receiving antenna AT are located opposite each other. Several transmitting antennas B2.i (i - 1...1) and several receiving antennas B1.i form an antenna pair with offset. Let's go! displacements relative to each other in order to suppress the interference of the signal from one of the VI antennas. to the neighboring but not corresponding receiving antenna VI1.K (K - 1..p, and "" K). Neighbor transmitting antennas! (82.i, B2i - 1) and the receiving antennas coupled to them (B1.i, B1.i - 1) are offset by some given distance, mainly - by the distance between the transmitting antenna (B2.i) and the coupled receiving antenna ( B1.Y). To weaken the influence of interference, diagonally shift the antenna pairs! placement mainly between the transmitting antennas Аг, АЗ and the receiving antenna A1.

In fig. 8 shows a block diagram of the control device according to the invention with the control of the control sensor apparatus according to fig. 7. When the document is fed to the processing machine containing the control device according to the invention, it is activated by photocells or similar position-determining sensors. Frequency generator! 41 starts the transmitting antenna

AND? and through the phase shifter 42 - transmitting antenna AZ. Thanks to the phase-shifted control of the device, the influence of interference from extraneous sources of energy is prevented, and fakes that do not have differences in electrical conductivity are recognized. This also applies to banknotes whose properties have changed, for example i) due to aging and/or mechanical damage and/or due to moisture. At the same time, several transmitting antennas B2.i (i - 1...1) are started by the second frequency generator 43 and the second phase shifter - 44.

Correspondingly, the arrangement across the direction of movement of banknotes is not in the same row. will weaken the influence of extraneous interference and prevent capacitive coupling of one transmitting antenna B2.i with one of the non-corresponding receiving antennas, antennas VI1.K (K - 1...p, i«s»K). Frequency! signals from two generators are selected in such a way that one M frequency is not a multiple of the other or is a multiple of their difference, so that! prevent signal distortions on receiving antennas. -

During the test, the signal of the transmitting antenna A2 is superimposed with the antenna A7 through a protective strip with continuous electrical conductivity, while the signal of the transmitting antenna AZ is connected to the receiving antenna Ai without capacitive coupling. The shortest distance between the transmitting antenna A2 and the receiving antenna Ai is less than the longest length of the electrically conductive protective strip in the smallest document subject to control. If in one of the moments of the check the protective strip is not in the zone of interaction of the transmitting antenna? 7-3) with the receiving antenna At, then the protective strip is located in the zone of interaction of the transmitting antenna AZ and the receiving antenna At, so that the rest of the functions are performed similarly to the case described above. Then on ;" receiving antenna A1 turns out to be a signal, which through the rectifier 45 and the selective amplifier 46 sends a signal to the microcontroller 47, which carries out the classification of authenticity by comparing the signal of the selective amplifier 46 with the signal recorded in the microcontroller 47, for example, with a special y5" threshold value. If the threshold value turns out to be exceeded, the microcontroller 47 classifies the checked object as an object with a through-through electrically conductive protective strip, which means that for German banknotes the object is recognized as genuine. If in the protective strip there are -I conductive marks, which, due to their length, are not absorbed by the transmitting antenna A? and 5p receiving antenna Ai, it is possible to recognize them using the arrangement according to the invention

Me. transmitting antennas B2.i and corresponding receiving antennas B1.i, since the distance between them is twice

And less than the distance between the transmitting antenna A2 and the receiving antenna At7. If, for example, the length of the conductive mark parallel to the direction of movement is 1.5 mm, then the distance between the transmitting antenna B2.i and the receiving antenna B1.i can be set equal to 1.3 mm/m, so that

B It will provide reliable capacitive recirculation. When checking the controlled protection against forgery, the document is forced to move at a given speed in the zone of action of the controlling sensor (Ф, the control device according to the invention. Thanks to the offset arrangement of the transmitting antennas B2.i and the receiving antennas Vii, with an orthogonal shift of the banknotes! relative to the direction of document transportation, compensation is obtained The signals generated on the receiving antennas V' through the rectifiers 48...50 and the selective amplifiers 51...53 are fed to the microcontroller 47. Depending on the quality and location of the protective strip in the document, the signals of the selective amplifiers 46 entering the input of the microcontroller 47 , 51...53 differ in frequency and amplitude characteristics. Therefore, it is possible to classify the document by the microcontroller 47 by comparing the frequencies and/or comparing the threshold value with values previously assigned and recorded in the 65 microcontroller 47. These values are determined by manual input, programming and/or comparisons with values that were parameterized! with an already classified clearing document.

Microcontroller 47 generates a signal characteristic of the machines, which confirms the authenticity of the controlled banknote. The classifying signal of the microcontroller 47 is transmitted to the corresponding indicator elements and/or sent for further processing to the corresponding interface of the processing machines. Just like different currencies! it is possible to distinguish one from another by the differences in their protective strips or threads, and fakes are also detected if they have copied protective strips or threads, or their segments. Thanks to the compact design of the entire control device, especially thanks to the combined unit of sensors and decoding electronics, as well as additional screening measures, new opportunities for noise attenuation have been discovered, which in practice are increasingly important. Placement of the control device in the processing machine is carried out so that the control sensor equipment does not affect the traditional transportation of banknotes.

How the control device according to the invention is built into a traditional processing machine is shown as an example in fig. 9.

Therefore, the monitoring sensor apparatus 54 consisting of the transmitting antennas A2, AZ, B2.i and the receiving antennas A1, B1.i is inserted into the guiding device 56. At the same time, the monitoring sensor apparatus 54 is located tangentially relative to the guiding apparatus 56 or tangentially and with a shift relative to of the leading roller 55 in such a way that it additionally supports its leading function in the area of the controlling sensor equipment! 54. Therefore, the banknote subject to 2nd inspection falls into the range of the sensors without the participation of additional pressing means.

The controlling sensor apparatus 54 is located tangentially relative to the existing guiding device 56 in such a way that the document driven by the guide rollers 55 moves past the controlling sensor apparatus! 54 at a given distance and with a given speed. The specified distance between the guide roller 55 and the guiding device 56 or the controlling sensor device 54 can be adjusted with the help of appropriate fasteners, mainly deflecting screws. Parameterization of threshold i) values and classification values is performed by switches, not shown in the drawing, or by corresponding programs of the microcontroller 47. Thus, the operator can change the classification values by a simple switch to switch to checking different currencies. Practically, when one of the signals is absent, or when it appears that is not typical for banknotes! the machine that processes the signal stops, and the fake or unusable banknote is removed. X,

Thanks to the lateral extension of the antenna device over the entire width of the document, its influence on the classification of authenticity is weakened - paper quality, age, humidity, etc. This also includes the possibility of classifying, for example, counterfeits, genuine banknotes and banknotes with a high degree of wear. Зта - з5 Kclassification is carried out by appropriate decoding of the amplitude and time characteristics of the signals output by the selective amplifiers 46, 51...53, and the corresponding parameterization of the threshold values by the decoding microcontroller 47. The calibration of the microcontroller 47 is carried out manually, with the help of software control or by monitoring with with the help of special calibration documents, from which the classification of authenticity becomes known. When using the last method, the calibration document is checked by the control device according to the invention as described above. instead of comparing the signals at the outputs of the selective amplifiers 46, 51...53 with the signals available in the microcontroller 47, they are entered into the microcontroller 47 as calibration values. with the second variant of the installation of the controlling sensor equipment! 54 known from patent application FRG 195 18 229.4. According to this invention, the monitoring sensor device 54 can be placed, for example, at the end of the arc-shaped guide device 56, as shown in Fig. 10. Here, too, clamping devices are not required for stretching the inspected objects with compliance with the specified gap and/or touching the control device. This possibility can be used if it is not possible to carry out the above-described tangentially displaced embedding of the control sensor apparatus -I 54 in the arc-shaped zone of the guide apparatus 56. Since according to the invention, the need

In clamping devices, for example, such as springs, clamping rollers, etc., the self-checking

Me. the object experiences less mechanical stress from the control device.

And the method according to the invention is described on the basis of specific versions of the control sensor equipment and decoding electronics in the money counting machine. However, it should be noted that the proposed invention is not limited to the details of the description in the examples of implementation, as within the claims of the invention, there are possibilities of changes and deviations. Yes, for example, opportunities! the most diverse versions of deciphering electronics, oriented on a special principle of action (F, selective amplifier. name)

Claims (21)

The formula of the invention 1. The method of checking the protection against forgery of documents using a capacitive connection between the transmitter and the receiver, consisting in the transfer of energy between the transmitter and the receiver by blocking the electromagnetic field with conductive protective strips, tapes, threads or flat protective materials and using a decryption unit, characterized by the fact that in the zone of optical sensors placed in the machine for processing mainly banknotes and/or securities, interacting with the monitoring sensor equipment and intended to activate this equipment with the help of several locations in one or more planes of sensors, functioning as transmitting or receiving antennas and/or electrodes, create a control field, M through the inspected object with the help of pointing antennas transmit electromagnetic energy, hanging from the form! and/or electrical conductivity of the inspected object, while several antennas are adjusted at least with a phase shift and transmit the received de-energization to the inclusion of a selective amplifier in the serial circuit, to eliminate de-energized interference and suppress the conductivity of the base of the inspected objects, for example, in banknotes, included in the selective amplifier 7/0 amplifier phase equalizing device, and the same filter! to suppress interference and extraneous weapons, and one node of the deciphering block is arranged in such a way that the classification of electrically conductive protective strips, tapes, threads or flat protective materials is possible, and the inspected object during the inspection is forcibly passed through the control field in a lateral position not set in advance. 2. The method according to claim 1, characterized by the fact that with the help of a decoding unit consisting of /5 connections of an analog-to-digital converter and a controller or integrator, a trigger, a controller, a monostable multivibrator and, if necessary, a logic element I, according to the signal characteristic at the output of the selective amplifier determine the exceeding of the limits! amplitude! And the control signal and/or time characteristic for a specific type of banknote in the mentioned excess. their Q. The method according to claim 2, characterized by the fact that, by means of the decoding block, the classification of authenticity is carried out by setting boundaries! specified amplitude A to determine the authenticity of the banknotes being checked. 4. The method according to claim 1 or 2, characterized by the fact that, by means of the decoding block, classification of various banknotes and/or securities is carried out, and characteristic for a specific type of banknotes is Time; set primarily with the help of the controller, and check the object! sort by the time characteristic of each type of banknote. bronze oini ns vne 5. The method according to claim 4, which is distinguished by the fact that for banknotes with the same time after their verification, additional verification is carried out with the help of the controller on various protective strips or threads. - 6. The method according to claim 1, characterized by the fact that the decoding unit, which is mainly one or several controllers, by comparing the time signal and/or comparing the voltage signal with 32 preset values of the control signal, identifies the characteristic for machines! signal for stacking - individual classified objects in special boxes or stacks. 7. The method according to claim 1 or 2, characterized by the fact that the antennas and/or electrodes across the direction of transportation of the inspected objects have such a length in the plane that even with a certain "side gap" of the inspected objects and regardless of whether the inspected object is turned face-on or reverse side up when passing through the control field, in any case a protective strip or Z thread at a given distance crosses the antenna and/or electrode, contacting them. "» 8. The method according to claim 5, characterized by the fact that the signal of the result of the additional check is combined with the "signal of the decoding unit" using the logic element AND without the need to make changes to the program of the corresponding machines for processing mainly banknotes and/or securities. 9. A device for checking the protection against forgery of documents with elements for capacitive communication while blocking the electromagnetic field with electroconductive protective strips, tapes, threads or flat protective materials with a decryption block, intended for the implementation of the method according to claim 1, characterized by the fact that it contains optical sensors, placed in the machine for the processing of mainly banknotes and/or securities, intended for the activation of capacitive b20 control sensor equipment, several sensors forming control fields, located in one or more planes and functioning as transmitting or receiving antennas, " m series connection of a selective amplifier, a phase comparator, a filter for suppressing interference and extraneous devices, and a decoding block consists of serially connected analog-to-digital converters and a controller or integrator, a trigger, a controller, a monostable 252 multivibrator, while the device is implemented in such a way that the tested object passes through an arbitrary F! in a lateral position at a specified speed through the inspection zone with the help of placements in that zone of clamps and/or conveyor belts, rolls, touches the sensors in a specified manner. at 10. The device according to claim 9, characterized by the fact that the sensors, functioning as transmitting or receiving antennas, are implemented in the form of strip sensors and placed in one or two planes and/or 60 positions! mirror 11. The device according to claim 10, characterized by the fact that strip sensors are equipped with recesses and/or through holes, and/or windows. 12. A device according to one of claims 9-11, characterized by location sensors! mirrored relative to controlled zones and/or protective strips, threads, and/or tapes of inspected objects, mainly banknotes, securities, and packaging. 13. A device for checking the protection against forgery of documents with electrically conductive protective strips, tapes, threads or flat protective materials, intended for the implementation of the method according to claim 1, characterized by the fact that several transmitting antennas and several receiving antennas form Ag, 45, B2.1 ..,82y ВА, 81.1,..,5m, once controlling sensor equipment, dispositions! with the possibility of monitoring both protective strips with through-through electrical conductivity and protective strips having several electrically conductive but isolated from each other sections within the protective strip, and the controlling sensor/o equipment is arranged in such a way that the verifiable protection against forgery of the document brought in the movement of the leading rolls moved past the controlling sensor equipment at a given distance and at a given speed, with two anti-phase settings for low or low frequency transmitting antennas; Oh set! perpendicular to the longitudinal direction of the protective strip with /5 and perpendicular to the direction of movement of the document protected against counterfeiting, and one or more receiving antennas | placements parallel to the opposite transmitting antennas TO DZ We are between them placements! several transmitting antennas. ro 1 Dy parallel with the transmitting antennas and several receiving antennas located at 42,45, and 811.05, P parallel to the transmitting antennas ro 1 Dy and adjacent to them transmitting antennas .1.., 28, antennas : : and coupling with they receive antennas : : positions! so Bi, pi 1 r r 851:2,811-1 v - - with ov bdvigo to a given distance, preferably - to the distance between the transmitting antenna horn connected to it and the receiving antenna 81 st. and the shortest distance from the transmitting antenna of Diya to a, . the receiving antenna associated with it is less than the shortest distance between one of M transmitting antennas and receiving antennas 42, 45 A. p 14. The device according to claim 13, characterized by the fact that several transmitting antennas 42 4 in 1 8 and receiving antennas 41 211. 81 are arranged across the entire width; ; . 1,..., 2; 1. and "passing of documents by machines for processing mainly banknotes and/or securities. " 15. The device according to claim 13 or 14, characterized by the fact that the transmitting antenna and the receiving antenna are located close to Аг, Аз Б2.1. would and A811. 851" next to each other, parallel to each other and with an offset in one plane so that the control of the authenticity of "documents, independent of the position of the sides and edges of the two parallel edges of the documents, is carried out. With t0 16. The device according to claim 13, characterized by the parallel displacement and/or arrangement in one row across the direction of transportation of the receiving antennas in row 1 and transmitting antennas and "1. . ," 821. 82 d / placement at such a distance from each other that any tested protective element crosses, regardless of its spatial position in the document, at least one receiving antenna and one transmitting antenna connected to it with U 81.11...81 .m "one conjugate redayuschka U 82.1...B2.p. 17. The device according to claim 13, characterized by the fact that the longest side of one transmitting antenna: i.e. -I and the longest side of the receiving antenna connected to it | Fills corresponding to the width U - U (22) of one conductive mark of the protective strip. 18. The device according to claim 13, characterized by the fact that it contains manually controlled or program-controlled switching and regulating elements), in particular a microcontroller, after the rectifiers and selective amplifiers, the arrangement is such that the output signal! Selective amplifiers can be combined! or logically connect. 19. The device according to claim 13, characterized by the fact that it contains manually controlled or HF) program-controlled switching and regulating elements), in particular a microcontroller, after 7 rectifiers, and selective amplifiers, arranged in such a way that switching between different types and types of documents without changing the position of the sensors. in 20. The device according to claim 18 or 19, characterized by the fact that the shortest distance between two locations in one row of the transmitting antennas is greater than the shortest distance between two electrically conductive isolation marks of the protective strip, and that the indication switches the element! accommodation! so that the antenna 47 can be used either as a transmitter or as a receiver, depending on the type of document to be checked. 21. The device according to claim 13, characterized by the fact that it contains manually controlled or software-controlled switching elements, arranged in such a way that one or more transmitting antennas and the receiving antenna 15 connected to them can be alternately initiated or de-initiated. 70 s with o h- (se) h- « « - with . a i» i» -I FU o "i ko 6o 65