RU2442216C1 - Device for controlling of the object anti-counterfeit element which changes brightness against the angle of observation and the method of control of the object anti-counterfeit element changing brightness against the angle of observation by means of this device - Google Patents

Abstract

FIELD: control devices. ^ SUBSTANCE: invention relates to control devices for identification of the authenticity of the valuable documents and concerns the arrangement and method for controlling of the object anti-counterfeit element which changes brightness against the angle of observation; the device comprises at least one optical cell consisting of a pair of sources of light to illuminate one and the same part of surface of the object and the optical receiver of the reflected light, the electronic unit securing sequential switching of the light sources and synchronous readout of the information from the optical receiver by means of electronic keys and analog to digital converters, the microprocessor unit for collecting, saving and processing of the received data; one pair of the sources of light are located from the opposite side respectively to the optical axis of the optical receiver, incident angles of light beams coming from the sources located on the left and on the right are equal; the optical axles of the light sources and the optical receiver are located in the same plane and intersect in the same spot on the surface of the object; the optical axel of the optical receiver is normally located in respect of the surface of the object. ^ EFFECT: invention allows to provide control of protection elements which alternate brightness, in the mode of high-speed sorting of bank notes and valuable papers. ^ 6 cl, 4 dwg.

Description

The invention relates to a device and method for determining authenticity when sorting banknotes and valuable documents containing a security element that changes brightness depending on the viewing angle.

Known patent EP 1669213 A1, IPC BVB 15/00, publication date 06/14/2006, describing a security element that changes brightness depending on the viewing angle. Such a security element is an image applied with a special ink containing mirror-reflecting flat pigment particles, the planes of the pigment particles being oriented equally at a certain angle to the plane of the sealed material. If the protective element is made in the form of two zones A and B, and the angle of inclination of the pigment particles in zone A differs from the angle of inclination of the pigment particles in zone B, then when viewed at a certain angle, zone A is perceived as light, and zone B as dark. When observing this protective element at the same angle, but from the opposite side, zone B is perceived as light, zone A as dark. Thus, when illuminating a given security element at a fixed angle, the brightness of the security element depends on the viewing angle. Similarly, when observed at a fixed angle, the brightness of the element depends on the angle of illumination. A special case of this protection element is an image applied with a special paint that changes color depending on the viewing angle.

Such a security element that changes brightness or color depending on the angle of view is suitable for the consumer and cash level of circulation of a valuable document. However, the cited patent does not say anything about a device that allows you to machine control this security element when sorting.

Closest to the proposed invention by technical nature and purpose is a device for determining the color of objects and a method for measuring the color of objects (US No. 4479718, IPC VVB 29/02, publ. 10/30/1984). A method for measuring the color of an object includes illuminating a part of the surface of the object with light from one light source and registering the reflected light with several photodetectors, the optical axes of which are located at different angles to the optical axis of the light source, but lie in the same plane with it. The device includes one light source, three photodetectors and means for determining the color of an object based on information about the spectral composition of the reflected light and determining a color change depending on the viewing angle.

However, these devices and methods are not intended and not suitable for monitoring security features that change brightness or color depending on the angle of view, as they are intended solely for monitoring widely used coatings with the metallic effect. The relative position of the optical axes of the photodetectors and the light source of the device does not allow effective control of the security features that change the brightness depending on the viewing angle. In addition, the method provides for the mandatory determination of the color coordinates of the object, while to control the protective features that change the brightness depending on the angle of view, it is enough to register only a change in brightness. In addition, this device is intended for static measurements and does not contain blocks that allow analysis over the entire width and length of a banknote in high-speed sorting mode with different orientations relative to the direction of movement of security features that change brightness or color depending on the viewing angle.

The problem solved by the invention and the technical result is the ability to control security features that change brightness in high-speed sorting of banknotes and valuable documents.

The technical result is achieved through the use of a device for monitoring the security element of the object, changing brightness depending on the viewing angle, containing at least one optical cell, consisting of a pair of light sources to illuminate the same part of the surface of the object and the reflected light detector, electronic unit that provides the alternate inclusion of light sources and synchronous reading of information from photodetectors using electronic keys and analog-to-digital converters, mic an processing unit for collecting, storing and processing the obtained data, while the light sources of one pair are located on opposite sides with respect to the optical axis of the photodetector, the angles of incidence of the rays from the light sources to the left and right with respect to the optical axis of the photodetector are equal, the optical axis of the light sources and the photodetector lie in the same plane and intersect at one point on the surface of the object, the optical axis of the photodetector is normal to the surface of the object.

The device further comprises means for determining, in a general manner, the presence of protective features of an object that change brightness depending on the viewing angle, including when moving an object, in particular during high-speed sorting, and whether or not they correspond to previously known signs.

In the device, at least two optical cells can be assembled into a single sensor with the possibility of analyzing the surface of the object for the presence of security features that change brightness depending on the viewing angle, both along the length and width of the object with different orientation of the security features relative to the direction displacement. In this case, the light sources and photodetectors can be staggered so that each photodetector has the ability to perceive reflected light from four adjacent light sources.

The device further comprises means for turning on each of these four light sources while the other three are turned off, the light sources are installed with the ability to irradiate the banknote being tested, and the reflected light photodetectors are installed with the ability to receive radiation reflected from the banknote being checked.

The specified technical result is also achieved due to the method of monitoring the security element, changing the brightness depending on the viewing angle using the above device, including when moving the object, in particular during high-speed sorting, including lighting part of the surface of the object with light alternately from two sources, collecting and processing data on the intensity of light reflected from the surface of the object from one and the other source, creating on their basis an image of the illuminated part of the object, while lighting CTA produced on opposite sides with respect to the optical axis of the photodetector at equal angles to its optical axis, the optical axis of the radiation source and the photoreceiver are arranged in one plane. To create an image, data obtained from different parts of the object are accumulated and analyzed, and the presence of protective features on the surface of the object, changing the brightness on the surface of the object depending on the viewing angle, and the correspondence or mismatch of their previously known signs are determined by the general image.

The implementation of the invention is illustrated by the following drawings:

figure 1, 2 - observation of a protective element that changes the brightness depending on the viewing angle at the same angle from opposite sides;

figure 3 - a device for monitoring an element of protection of an object with one optical cell;

figure 4 - a device for monitoring the security element of the object in the form of a block of several optical cells.

A device for monitoring a security element that changes brightness depending on the viewing angle, with one optical cell, shown in figure 3, contains two identical light sources (1), which are used, for example, LEDs, a photodetector (2), made for example, in the form of a photodiode, the test sample (3), the diaphragm (4), which defines the incidence of light rays on a portion of the surface of the sample opposite the photodetector at a certain angle, light rays (5), a protective mark on the surface of the sample, which changes brightness when the angle changesobservations (6), the electronic unit (7), which provides the alternate inclusion of light sources and synchronous reading of information from photodetectors using electronic keys and analog-to-digital converters, as well as a microprocessor unit (8) for collecting, storing and processing the received data, which and forms a conclusion about the presence of a protective sign.

Figure 4 shows a device for monitoring security features that change brightness depending on the viewing angle, made in the form of a block of several LEDs and photodetectors forming such optical cells, while some LEDs are used in two, three or four optical cells at the same time.

The inclusion of LEDs located relative to the photodetector in mutually perpendicular planes allows the recognition of the vertical and horizontal orientations of the protective marks.

The invention is illustrated by the following example of its implementation.

One, two or more objects are tested that have predetermined security features that change brightness depending on the viewing angle, and related to certain types of industrial products. When the system is operating, the LEDs are switched on alternately by the electronic unit 7. The light signal reflected from the protective mark (6), for example, from the left one on the LED circuit, is captured by the photodetector (2) and is recorded by the electronic unit 8 as analytical signal No. 1. Then the first LED turns off, the second one turns on (on the right in the diagram), the light hits the mark (6) from the opposite side, the reflected light is captured by the photodetector and recorded as analytical signal No. 2. Based on these signals, in block 8 two label images are created, for the first and second rays. The main measured parameter is the intensity of the reflected light. If the difference between the parameters of signals No. 1 and No. 2 exceeds a preset value, block 8 generates a conclusion about the presence of a protective feature in the illuminated part of the surface of the object that changes brightness depending on the viewing angle, if there is no difference between the parameters of these signals, block 8 generates a conclusion about the absence of any protective feature in the illuminated part of the surface of the object that changes brightness depending on the viewing angle.

When testing genuine objects on which such protection elements are known to exist, the intensities of the reflected light of each of the images of reflection signals No. 1 and No. 2 are formed in the corresponding data bank as a common image of the label, and this image, that is, the set of measured parameters, is identified with a certain label and, accordingly, with products protected by this label.

In the same way, tags protecting other types of products are tested with the accumulation of information in the corresponding databank.

From the above it is seen that the above information confirms the possibility of implementing the claimed invention and solving the problem.

Claims (4)

1. A device for monitoring the security element of an object that changes brightness depending on the viewing angle, containing at least one optical cell, consisting of a pair of light sources to illuminate the same part of the surface of the object and the reflected light detector, an electronic unit that provides alternately switching on light sources and synchronously reading information from photodetectors using electronic keys and analog-to-digital converters, a microprocessor unit for collecting, storing and processing received data, while the light sources of one pair are located on opposite sides with respect to the optical axis of the photodetector, the angles of incidence of rays from light sources to the left and right with respect to the optical axis of the photodetector are equal, the optical axis of the sources and photodetector lie in the same plane and intersect in one point on the surface of the object, the optical axis of the photodetector is normal to the surface of the object. 2. The device according to claim 1, characterized in that at least two optical cells are assembled into a single sensor with the possibility of analyzing the surface of the object for the presence of security features that change brightness depending on the viewing angle, both in length and in the width of the object with different orientation of the security features relative to the direction of movement. 3. The device according to claim 1 or 2, characterized in that the light sources and photodetectors are arranged in a checkerboard pattern so that each photodetector has the ability to perceive reflected light from four adjacent light sources. 4. A method for monitoring an object security element that changes brightness depending on the viewing angle using the device according to any one of claims 1 to 3, comprising illuminating part of the surface of the object with light alternately from two sources, collecting and processing data on the intensity of light reflected from the surface of the object from one and the other sources, creating on their basis an image of the illuminated part of the object, while the object is illuminated from opposite sides with respect to the optical axis of the photodetector at equal angles to its optical axis, The optical axes of the radiation sources and the photodetector are located in the same plane, to create an image, the data obtained from different parts of the object are accumulated and analyzed, and the presence of a security element on the surface of the object, which changes brightness depending on the viewing angle, is determined by the general image.

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