MXPA99009788A - Application and method for checking documents with effective optical diffraction security layer - Google Patents

Abstract

The invention relates to an application and a method for checking documents. Hitherto, documents with optical diffraction security layers, specially holograms, were checked by costly optical monitoring technology. The entire monitoring process was so time-consuming that the monitoring process could not be applied to fast operating processing machines. Rapid monitoring (as an authentication characteristic) constitutes a further security step in evaluating effective optical diffraction security layers. The effective optical diffraction layer has a discontinuous metallizing layer and/or partially metal layers and/or areas of metal layers on various planes. Several methods of measurement exist to detect electrical conductivity. In practice, the contactless capacitive method of measurement has proven to be more practical.

Description

EMPLOYMENT AND METHOD FOR "VERIFYING DOCUMENTS WITH AN EFFECTIVE OPTICAL DIFFACTION SECURITY LAYER Description of the invention The invention relates to an application and a method for verifying documents. in particular holograms, they are controlled with complex optical verification techniques.

For this, the object to be verified must be placed with great precision. The entire verification process takes so long to proceed, that these verification methods are not applicable in high-speed processing machines. For example, it is impossible to verify paper currency with authenticity characteristic in the form of a hologram in a banknote counting machine, since it operates at speeds of between 500 and 1500 banknotes per minute, and even more. The document DE 27 47 156 describes a verification method and apparatus for verifying the authenticity of holographically protected identity cards. The hologram is reproduced and a visual control is carried out. This method is not suitable for a quick, independent verification of people. In EP 0 042 946 a device is described for producing scan patterns that are verified by laser systems, mirrors and lenses as well as by a photoelectric detector. Also in this case the economic expense is very high. It will be increased even more if the objects to be verified should be controlled in an unclassified manner. In order to avoid pre-classification, a multiple provision of the authenticity verification system would be necessary. The task of the invention consists in eliminating the disadvantages of the state of the art, and proposing an application and a method for the verification of documents with effective optical diffraction security layers, in particular olograms, which can be carried out quickly, independently of the people and with little expense. The method should be able to be used both in document verification devices and money processing machines, as well as in manual verification devices to verify documents with effective optical diffraction security layers. This task is solved by the features indicated in the distinguishing part of claim 1. The application of holograms and other layers of effective optical diffraction security to protect documents and other negotiable instruments as well as bank notes against counterfeits is currently increasingly widespread. A rapid verifiability represents another stage of security in the evaluation of effective optical diffraction security layers as a feature of authenticity. The effective optical diffraction security layers are constituted inter alia by a metallized layer. This metallized layer is electrically conductive. The electrical conductivity varies depending on the thickness of the layer. The effective optical diffraction security layer has a discontinuous metallized layer and / or partially metallic layers and / or metallic layer zones in different planes. Various measuring processes are known that prove an electrical conductivity. In practice it has been found that the capacitive contactless measurement method is practicable. In this method for the verification of protected documents, a capacitive coupling between the emitter and the receiver and the transmission of energy between the emitter and the receiver is exploited by bridging an electromagnetic field through electrically conductive protective materials. An electronic evaluation system coupled next compares the image of the signals of the verifying with the corresponding reference signals. The comparison generates a classification signal to continue with the process. It would therefore be possible, for example, to separate a document that is recognized as a counterfeit by stopping the verification device. The image of the signal is a function of the structure of the metallized layer of the effective optical diffraction security layer. If the effective optical diffraction safety layers have a discontinuous metallized layer, then several segments of the metallized layer have different electrical conductivities. Practice has shown that these various electrical conductivities exert an effect on the signal image. An additional increase in the reliability of the verification results from the combination of the verification of the electrical conductivity with other authenticity characteristics of the effective optical diffraction security layer. By introducing additional authenticity characteristics into the demetallised segments within the discontinuous metallized layers and / or partially metallic layers and / or between metal layer zones in different planes it is possible to simultaneously verify these characteristics as well as the electrical conductivity. To define the authenticity, by means of the electronic evaluation system a signal of authenticity of another sensor is linked to the sensor for the measurement of the electrical conductivity. At the output of the electronic evaluation system there is a signal that classifies the effective optical diffraction safety layer for further processing. This additional authenticity characteristic has fluorescent, phosphorescent or light-absorbing properties, or it differs from its surroundings by means of different magnetic properties. Accordingly, an optical or magnetic sensor is used. To reduce detection and measurement errors, a support for the sensors is preferably used. This support houses all the sensors for the detection of authenticity characteristics. In this way the distances between the sensors are minimized, and the sensors are always arranged in a defined position. In order to avoid disturbing influences, the sensor support is connected in a compact manner to a carrier board of the electronic evaluation system. The entire verification device is located inside processing machines, so that additional costs for the transport of the objects to be verified are unnecessary. In addition to the claims, the characteristics of the invention are also apparent from the description and the drawings, the individual characteristics representing in each case, alone or in the form of sub-combinations, proteomic embodiments for which, in the This document claims protection. An exemplary embodiment of the invention is shown in the drawings and is explained in more detail in the following exemplary embodiment. In the drawings show: Figure 1 a schematic cut through a processing machine with verification device, Figure 2a a schematic section through a hologram with demetallized segments, Figure 2b a voltage-time diagram of the signal of evaluation, figure 3a a schematic section through a hologram with discontinuous metallized layer, figure 3b a voltage-time diagram of the evaluation signal, figure 4a a schematic section through a hologram with characteristic of ultraviolet authenticity , Figure 4b the voltage-time diagram of the electric conductivity verification evaluation signal, Figure 4c the voltage-time diagram of the ultraviolet sensor evaluation signal. The method of verification according to the invention provides that in the banknote counting machines the corresponding sensors are installed in the appropriate positions. The sensors for detecting the electrical conductivity are configured so that the total width of the banknote is covered, so that the sensor can check the banknotes neutrally with respect to the position. The optical or mechanical sensors detect the presence of a banknote and issue a reference signal for the time control of the verification device 4. Likewise, the sensors are activated to verify the authenticity of the hologram. By registering the entire time window from the beginning of the banknote to its end you can define the position of the hologram on the banknote. Figure 1 shows how the verification device 4 is arranged on the banknote transportation path. The banknote counting machine comprises an intake drive wheel 1, transport wheels 2, a device 3 guider of the banknotes and a verification device 4. Figure 2a shows a schematic section through a hologram with a carrier layer 11 and a partially metallic layer 12. The partially metallic layer 12 comprises several demetallised segments 13. In Figure 2b the corresponding evaluation signal is represented in a voltage-time diagram. Figure 3a shows a schematic section through a hologram with a carrier layer 11 and a layer 14 metallized in discontinuous form. The layer 14 metallized in discontinuous form comprises the segments 15, 16, 17, 18, 19 with different electrical conductivity. In Figure 3b the corresponding evaluation signal is represented in a voltage-time diagram. Figure 4a shows a schematic section through a hologram with a carrier layer 11 and a metallized layer 20 in discontinuous form. The metallized layer 20 in discontinuous form comprises the demetallised segments 21 as well as additional authenticity verification features. In the case of these authenticity characteristics, these are fluorescent colors 22, which during the verification are excited by ultraviolet light and are detected by means of photoelectric sensors. The additional features of verification of the preference authenticity are found within the demetalized segments. Figure 4b shows the corresponding sensor evaluation signal that works capacitively and verifies the electrical conductivity in a voltage-time diagram. Figure 4c shows in a voltage-time diagram the trajectory of the curve of the evaluation signal of the photoelectric sensor. In the present invention, the verification of documents with effective optical diffraction security layers was explained on the basis of a specific embodiment. However, we note that the present invention is not limited to the details of the description of the embodiment, since modifications and variations are claimed within the framework of the patent claims.

Claims (1)

1. CLAIMS Application of the method for the verification of documents by making use of the capacitive coupling between the emitter and the receiver and the transmission of energy between the emitter and the receiver through electrically conductive protective materials, characterized in order to verify the authenticity of documents with layers of optical diffraction safety eff ective with discontinuous metallized layer or partially metallic layers or areas of metal plates in different planes the electrical conductivity is defined and evaluated. Application of the method according to claim 1, characterized in that to verify the authenticity of documents with effective optical diffraction security layers with discontinuous metallized layer or partially metallic layers the electrical conductivity is defined and evaluated. Application of the method according to claim 1, characterized in that to verify the authenticity of documents with effective optical diffraction security layers with discontinuous metallized layer and metal layer zones in different planes the electrical conductivity is defined and evaluated. Application of the method according to claim 1, characterized in that to verify the authenticity of documents with effective optical diffraction security layers with partially metallic layers and metal layer zones in different planes the electrical conductivity is defined and evaluated. Application of the method according to claim 1, characterized in that to verify the authenticity of documents with effective optical diffraction security layers with discontinuous metallized layer and partially metallic layers and metal layer zones in different planes the electrical conductivity is defined and evaluated. Application of the method according to one or more of claims 1 to 5, characterized by the verification of additionally introductory authenticity characteristics within the demetallised segments within discontinuous metallized layers and / or partially metallic layers and / or between metallic layer zones in different planes. Application of the method according to claim 6, characterized by the verification of the fluorescence properties of the additionally introductory authenticity characteristic. Application of the method according to claim 6, characterized by the verification of the phosphorescence properties of the additionally introductory authenticity characteristic. Application of the method according to claim 6, characterized by the verification of the light absorbing properties of the additionally introductory authenticity characteristic. Application of the method according to claim 6, characterized by the verification of the differentiating magnetic properties of the environment of the additionally introductory authenticity characteristic. Application of the method according to one or more of the preceding claims, characterized in that the effective optical diffraction security layer is a hologram. Application of the method according to one or more of the preceding claims, characterized by the verification of holograms in high-speed processing machines with a speed of up to 2000 documents per minute. Application of the method according to one or more of the preceding claims, characterized by the verification of holograms in manual devices. Method for document verification by taking advantage of the capacitive coupling between the emitter and the receiver and the transmission of energy between the emitter and the receiver through electrically conductive protection materials, characterized in that a document to be verified comprising a layer of Efficient optical diffraction security with discontinuous metallized layer and / or partially metallic layers and / or metal layer areas in different planes is passed in front of an electronic sensor system with a defined speed, energy is transmitted capacitively from one or several emitting electrodes through metallized layers to one or more receiving electrodes, and the signals applied to the receiver electrode (s) are amplified by an electronic evaluation system, compared to a reference signal and to the output of the electronic evaluation system there is a signal that classifies the document for further processing. Method according to claim 14, characterized in that a document with effective optical diffraction security layers is verified in at least two different verification directions. Method according to claim 14, characterized in that by means of the electronic evaluation system the classification signal is logically linked to an authenticity signal of an authenticity characteristic additionally introduced after it has been verified by another sensor, and to the output of the system electronic evaluation there is a link signal that classifies the document for further processing.