EP2896020B1 - Coin and methods for testing and producing a coin - Google Patents

Description

The invention relates to a coin, a method for checking a coin and a method for producing a coin according to the preamble of the independent claims.

When recognizing and checking the authenticity of coins, these are often used in terms of their dimensions, e.g. Diameter and thickness, alloy properties, e.g. Color, conductivity, magnetism or bimetallic properties, or coin design, e.g. Embossing and knurling, checked. Furthermore, by determining the weight and the center of gravity of a coin, it can be determined whether the coin has been correctly processed and e.g. bears an exactly central embossing.

With coins of simple design, it can happen that these are imitated, e.g. is analyzed with regard to conductivity, color, weight and dimensions and a starting material, in particular a metal or a metal alloy, is used for a coin forgery, which has these properties with sufficient accuracy. In addition, machine testing of coins with regard to the properties mentioned is usually complex and / or not possible at the speed required in each case.

Out US 2011/0305919 A1 It is known to apply a metal layer with particles embedded therein to a metal substrate, which can be a coin, the particles being able to convert light from one wavelength to another.

Out DE 10 2010 013 148 A1 Bimetal coins are known in which an insulating layer is provided which runs concentrically between an inner disk and an outer ring and is doped with fluorescent particles, among other things.

Out WO 2011/144931 A1 It is known to apply electromagnetic radiation in the form of X-rays to a coin and to detect the fluorescent radiation or reflected radiation emanating from the coin in order to infer the metal content of the coin.

From the US5673503A and the US3983646A Plastic game chips are known, which can have a metallic core, and in the edge of which there are depressions in which fluorescent substances are introduced.

The manufacturing processes known from the prior art are relatively complex. Furthermore, the layers applied to coins are often exposed to severe mechanical stresses when the coins are in use and can be damaged and / or rubbed off in the process, so that they can no longer fulfill their function as an additional security feature in the, in particular machine, checking of the coin.

It is the object of the invention to specify a coin which has a security feature that is better protected against stresses and / or environmental influences. In particular, a method is to be specified in each case by which such coins can be checked at a higher speed or produced in a simple manner.

The object is achieved by the coin, the method for checking a coin and the method for producing a coin according to the independent claims.

The coin according to the invention has a disc-shaped coin body made of metal or metal alloy, with an edge and is characterized in that at least one recess is provided in the edge of the coin body, in which at least one luminescent substance is located.

The method according to the invention for producing a coin with a disc-shaped coin body made of metal or metal alloy, which has an edge, is characterized in that the edge of the coin body, in particular the edge surface of the coin body, is provided with at least one recess in which at least one luminescent Substance is introduced. The recess points, starting from the edge of the coin body, into the interior of the coin body. For this purpose, the recess is made in the edge of the coin body in a direction which runs essentially parallel to the disk-shaped surface of the coin body. The direction of introduction can also run inclined to the disk-shaped surface.

The method for testing the coin according to the invention is characterized in that the coin, in particular the edge of the coin body, is irradiated with electromagnetic radiation, electromagnetic radiation emanating from the coin, in particular emission light emanating from the edge of the coin body, is detected by a detector and transferred into a Detector signal is converted and the detector signal is used to check the coin.

A coin within the meaning of the invention is a disk-shaped object which is made from metal or a metal alloy, provided with an embossing and used as a means of payment. A coin within the meaning of the invention has a coin body preferably in the form of a flat cylinder, the top surface of the cylinder forming the front (so-called obverse) of the coin, the base surface of the cylinder the back (so-called reverse) of the coin forms and the outer surface of the cylinder forms the edge of the coin, in particular its edge surface.

The invention is based on the idea of introducing a luminescent security feature into one or more depressions made in the edge of the coin or provided on the edge of the coin. The at least one recess is made in the edge surface of the disc-shaped coin body. The edge surface runs perpendicular to the disc-shaped surface of the coin body. The recess has a bottom which is located in the interior of the coin body. For example, the recess is formed by a hole or a groove. The floor runs e.g. transversely, in particular perpendicular, to the disk-shaped surface of the coin body. The bottom of the recess can be flat or trough-shaped. The depression can, however, also taper towards a quasi point-shaped bottom.

The luminescent security feature has at least one luminescent substance which, when excited, emits electromagnetic radiation which can be detected and analyzed when the coin is checked, so that conclusions can be drawn about the presence or authenticity of the security feature and thus the authenticity of the coin can. The terms “luminescent security feature” and “luminescent substance” are used synonymously in connection with the presentation of the present invention.

Substances which can be excited in different ways to emit electromagnetic radiation can be used as the luminescent substance. The substances used can preferably be excited to so-called photoluminescence by electromagnetic radiation; such substances are also known as luminophores. Alternatively or additionally, however, it is also possible to use substances which can be excited by electrical current to emit electromagnetic radiation, which is referred to as so-called electroluminescence. Furthermore, substances can be used which are stimulated to so-called thermoluminescence by the supply of heat. Other types of luminescent substances can also be used for the invention, in particular those which exhibit cathodoluminescence, triboluminescence, sonoluminescence, radioluminescence or ionoluminescence.

By introducing the luminescent security feature according to the invention into the depressions located on the edge of the coin, it is much better protected from mechanical stress during the circulation of the coin, e.g. Abrasion and impacts, as well as environmental influences, such as Sunlight and moisture protected as prior art coins. Furthermore, such coins can be produced in a simple manner and can be machine checked at high speed.

The edge of the coin body preferably has an edge surface in which the at least one recess is provided, in particular made. In particular, the edge surface has essentially the shape of a jacket surface of a flat cylinder, into which the at least one recess is made. The recess can be made in the edge surface, for example, by laser ablation, embossing, engraving, milling or drilling. The coin can thereby be manufactured and checked in a particularly simple manner, the security feature at the same time being well protected from mechanical stress.

It is also preferred that the at least one depression is designed in the shape of a hole. In this case, under a hole is in particular one towards one side to understand open cavity. As a result, a recess and its filling with the luminescent substance can be implemented in a particularly simple manner, without the protection of the security feature from mechanical stress and environmental influences being impaired as a result.

Alternatively or additionally, the at least one recess can have a groove which runs along the edge. In this way, a section along the circumference of the coin, in particular along the entire circumference, can be provided with the security feature, which makes the authenticity check particularly reliable, since the security feature can then be detected over a larger angular range of the coin. In the case of a groove running completely around the coin, the security feature can always be recognized independently of the respective angular position of the coin.

In a further preferred embodiment, the at least one recess has an opening located on the edge of the coin body. The fact that the luminescent substance can be introduced from the edge of the body of the coin makes it particularly easy to manufacture the coin. Furthermore, the luminescent substance can be made to emit luminescent light in a simple manner by merely removing the edge of the coin, e.g. in the form of irradiation with light, is excited. Since the luminescent light is emitted from the edge of the coin, the luminescent light can also be detected during the rolling transport of the coin.

It is also possible that the openings of the depressions located on the edge of the coin body have the shape of symbols, in particular letters and / or digits. This has the advantage that, in addition to encoding the coin by the luminescent security feature as such, a further encoding takes place in the form of the letters, digits or symbols introduced into the edge, which further increases the security against forgery. The symbols are preferably introduced into the edge of the coin body by laser ablation, embossing, engraving, milling or drilling.

In a further advantageous embodiment of the invention, the at least one recess has a cross section which, starting from the edge, increases in the direction of the interior of the coin body. The opening of the recess at the edge of the coin body is therefore smaller than the cross-sections of the recess lying inside the coin body. Because of this relatively small "attack surface", the luminescent security feature located in the depression is particularly reliably protected from mechanical stresses and environmental influences.

The at least one luminescent substance is preferably a photoluminescent substance which, when exposed to electromagnetic radiation, in particular light, shows luminescence, ie is excited to emit emission light. The spectral range of the emission light is usually different from the spectral range of the exciting electromagnetic radiation, but can overlap with it. In particular, the photoluminescent substance shows fluorescence and / or phosphorescence. In the case of fluorescence, the afterglow period of the excited light is typically up to about 10 ^-6 s, while in the case of phosphorescence longer, in particular significantly longer, afterglow periods occur.

In one embodiment, an organic resin is provided in the recess, in which the luminescent substance is dispersed or is resolved. The luminescent substance is thereby introduced into the recess in a simple manner and held there with high reliability, which further reduces wear effects due to mechanical stress and environmental influences during the circulation.

The resin, in particular provided with a dye additive, is preferably visible to the naked eye together with the luminescent substance dispersed or dissolved therein. In addition to a simple and quick machine check, it can also be recognized with the naked eye whether the security feature is present in the edge area of the coin.

Alternatively, however, it is also possible for the resin, together with the luminescent substance dispersed or dissolved therein, to be transparent and / or not or only with difficulty to be seen with the naked eye. In this variant, the security feature is a machine test or a test with aids, such as reserved for a magnifying glass, a microscope or a UV lamp.

It is also possible for the luminescent substance or the luminescent substances to be applied to an inorganic carrier substance or filler in the form of particles. The particles, which preferably have a diameter of less than 100 μm, are introduced into the depression in particular by means of a resin.

In a further advantageous development of the invention, the luminescent substance has two or more luminescent substances. What is achieved thereby is that the spectrum of the light excited and emitted in the luminescent substance is more complex and therefore essential More difficult to imitate than when using only one luminescent substance.

It is particularly advantageous if a first luminescent substance can absorb electromagnetic radiation in a first spectral range and a second luminescent substance can emit emission light in a second spectral range after being excited by electromagnetic radiation, the first and second spectral ranges at least partially overlapping. The emission light emitted by the second luminescent substance excites the first luminescent substance to further emit emission light, an energy transfer taking place between the two luminescent substances. In this way, an emission wavelength that is atypical for the excitation wavelength can be achieved and therefore it is difficult to imitate the security feature.

Fig. 1

ein erstes Beispiel einer erfindungsgemäßen Münze in einer perspektivischen Ansicht;

Fig. 2

ein erstes Beispiel einer Schnittansicht durch die in Figur 1 gezeigte Münze;

Fig. 3

ein zweites Beispiel einer Schnittansicht durch eine erfindungsgemäße Münze;

Fig. 4

ein drittes Beispiel einer Schnittansicht durch eine erfindungsgemäße Münze;

Fig. 5

ein zweites Beispiel einer erfindungsgemäßen Münze in einer perspektivischen Ansicht;

Fig. 6

ein Beispiel einer Vorrichtung zur Durchführung des Verfahrens zur Prüfung der erfindungsgemäßen Münze;

Fig. 7

ein erstes Beispiel von Signalen, die bei der Durchführung des Verfahrens zur Prüfung von Münzen erhaltenen werden; und

Fig. 8

ein zweites Beispiel von Signalen, die bei der Durchführung des Verfahrens zur Prüfung von Münzen erhaltenen werden.

Further advantages, features and possible applications of the present invention emerge from the following description in conjunction with the figures. Show it:

Fig. 1

a first example of a coin according to the invention in a perspective view;

Fig. 2

a first example of a sectional view through the in Figure 1 coin shown;

Fig. 3

a second example of a sectional view through a coin according to the invention;

Fig. 4

a third example of a sectional view through a coin according to the invention;

Fig. 5

a second example of a coin according to the invention in a perspective view;

Fig. 6

an example of a device for performing the method for testing the coin according to the invention;

Fig. 7

a first example of signals obtained when performing the method for verifying coins; and

Fig. 8

a second example of signals obtained when performing the method for verifying coins.

Figure 1 shows a first example of a coin according to the invention in a perspective view. The coin comprises a disk-shaped coin body 1 in the form of a flat cylinder which has a front side 2, a rear side 3 opposite the front side 2 and an edge 4 which forms the outer surface of the cylinder. The diameter of the front 2 and rear 3 is significantly greater than the width of the edge 4, ie the height of the lateral surface of the cylinder.

The coin body 1 is made of metal or a metal alloy and is embossed in the area of the front side 2 and the rear side 3. The edge 4 of the coin body 1 can also be provided with an embossing, in particular so-called knurling (both not shown).

The edge 4 of the coin body 1 has several depressions 5, in each of which a security feature 6 is introduced which has at least one luminescent substance. In the example shown, the depressions 5 in the edge 4 of the coin body 1 are formed by holes in the form of cavities which each have an opening toward the edge 4 - circular in the example shown.

Figure 2 FIG. 13 shows an example of a view of a sectional plane running parallel to the axis of rotation of the cylindrical coin body 1 through the plane of FIG Figure 1 shown coin. The depressions 5, which are cylindrical in the example shown, in the area of the edge 4 of the coin body 1 have a rectangular shape in the sectional view selected here. The size of the openings 7 directly on the edge 4 corresponds to the size of the respective opposite surfaces 8 of the recess 5 in the interior of the coin body 1, which each form the bottom of the recess.

Figure 3 shows a further example of a sectional view through a coin according to the invention, the depressions 5 being designed in such a way that their cross section, starting from the edge 4 of the coin body 1, increases in the direction of the interior of the coin body 1. In the example shown, the opening 7 at the edge 4 of the coin body 1 has a smaller diameter than the bottom 8 of the recess 5 in the interior of the coin body 1 opposite the opening 7. Recesses 5 shaped in this way have the particular advantage that they contain comparatively large amounts of the Can accommodate luminescent substances doped security feature 6. At the same time, however, the size of the openings 7 towards the edge 4 of the coin body 1 is kept small in order to avoid a use-related, partial loss of the security feature 6, for example through abrasion and / or impacts, or to keep its impairment by environmental influences as low as possible.

Figure 4 shows a further example of a sectional view through the coin according to the invention, in which the cross section of the depressions decreases starting from the edge 4 of the coin body 1 towards the interior of the coin body 1. Accordingly, in the example shown, the diameter of the opening 7 at the edge 4 is greater than the diameter of the bottom 8 of the recess 5 opposite the opening 7. Recesses 5 of this shape can be produced particularly easily and reliably filled with the security feature 6.

As an alternative or in addition to the examples described above, the depressions 5 can also have various other shapes and / or sizes. For example, instead of a circular cross-sectional area of the depressions 5, an oval, triangular, quadrangular, polygonal or any other shaped cross-sectional area can be provided. Furthermore, the recesses 5 can also have the shape of a trough instead of a cylindrical or frustoconical shape. Furthermore, it is also possible to make the depressions 5 in the edge 4 elongate, so that one or more grooves are obtained. It can be advantageous here to provide a groove running along the entire edge 4.

The size of the depressions can also be varied and adapted to the respective requirements with regard to forgery protection and / or wear protection. Thus, the openings 7 on the edge 4 and / or the cross-sectional areas of the depressions 5 and / or the depth of the depressions 5 relative to the width of the edge 4 can be smaller or larger than in the examples shown.

Figure 5 shows a second example of a coin according to the invention in a perspective view. In this example, recesses 5 in the form of symbols, namely letters and characters, are provided in the area of the edge 4 of the body of the coin 1, which are obtained, for example, by embossing in the edge 4 of the body of the coin 1. As a result, the authenticity of the coin can take place not only by checking the presence of the security feature 6 as such, but also by checking the symbols, especially with the naked eye, which is an additional, simple authenticity check especially while the coin is in circulation enables.

According to the above in connection with the Figures 1 to 4 described configurations of the wells is also in the in Figure 5 In the example shown, a security feature 6, which has at least one luminescent substance, is introduced into the depressions 5.

As already explained in more detail at the beginning, the introduction according to the invention of luminescent substances in the area of the edge 4 of the coin body 1 offers increased protection of the luminescent substances from abrasion, impacts and other environmental influences.

The luminescent substance is introduced into the depressions 5 with the aid of organic resins or adhesive systems in which the luminescent substance is dissolved or dispersed. In principle, organic or inorganic luminescent substances or combinations of organic and inorganic luminescent substances can be used as luminescent substances.

Organic and inorganic downconverter luminophores, upconverter luminophores and photochromic luminophores can be used as luminophores. Downconverter luminophores convert the excitation light into lower-energy emission light, while upconverter luminophores convert the excitation light into higher-energy emission light. In the case of photochromic luminophores, the absorption behavior can change reversibly when exposed to excitation light of certain wavelengths. Combinations of several luminophores which are readily soluble in the resin system selected are preferably used.

In a particularly preferred embodiment, the combination of the luminophores is chosen so that the absorption spectrum of one luminophore at least partially spectrally overlaps with the emission spectrum of a further luminophore and thus an energy transfer between the combined luminophores can take place.

The phosphor system can also be applied to inorganic substrates for introduction into the depressions by means of a resin. Particularly, but not exclusively, titanium dioxide, such as e.g. Rutile and anatase, silicates, glass, barium sulfate and aluminum oxide. The respectively preferred grain sizes are below 100 µm (D99), preferably below 20 µm.

Particularly suitable resins or adhesive systems are cyanoacrylates, acrylates, methacrylates, polyurethanes and, in particular, two-component epoxy systems. Mixtures of the resin systems mentioned can also be used. The surface of the depressions 5 can optionally be coated with a so-called primer before the security feature 6 is introduced be pretreated as an adhesion promoter between the metal of the coin body 1 on the one hand and the resin or adhesive on the other hand.

The combination of resin system and luminescent substance can be selected in such a way that the security feature 6 is transparent and / or cannot be seen, or only with difficulty, with the naked eye after it has been introduced into the depressions 5. This embodiment is particularly preferred if the security feature is to be readable purely by machine.

In principle, however, it is also possible to use opaque adhesive systems and / or additional dye additives, so that the security feature 6 is visible to the naked eye as a, in particular colored, marking on the edge 4 of the coin body 1. This variant is particularly preferred when the machine-readable security feature 6 is also to be recognizable with the naked eye.

In the following, further exemplary embodiments for coins are given in which the advantages according to the invention come into play and which can be easily produced in the manner according to the invention and checked for authenticity at high speed.

Embodiment 1:

A coin body with a diameter of 25 mm, a thickness of 2.5 mm, circular depressions with a diameter of 1.5 mm and a depth of 1 mm in the knurling of the edge 4 is provided with a security feature 6 according to the invention described above. For this purpose, a UV-curing acrylic adhesive, in particular of the Loctite® 350 brand from Henkel, is mixed with 0.5% fluorescein and the depressions 5 on the knurling filled with it. The coin body is then cured at 60 ° C for two hours.

Embodiment 2:

A coin body with a diameter of 10 mm and a thickness of 1.5 mm and a 0.5 mm wide and 1 mm deep groove-shaped depression in the knurling on the edge 4 is pretreated on the knurling with a primer 94 of the 3M® brand. After a drying time of about 10 minutes, a mixture of the epoxy resin DP760 from 3M® and 1% fluorescein is introduced into the groove and the coin body obtained is cured at 70 ° C for one hour.

Embodiment 3:

A coin body with a diameter of 30 mm, a thickness of 2.0 mm and circular depressions with a diameter of 1 mm and a depth of 1 mm in the knurling is provided with the security feature 6 according to the invention described. For this purpose, the Loctite® brand epoxy resin 330 from Henkel is mixed with 5% XYMARA® Marker Turquoise LF1A from Ciba® and the indentations on the knurling are filled with it. For curing, the filled depressions are irradiated with light at a wavelength of 365 nm and an intensity of 100 mW / cm ² for one minute each.

After the security feature 6 has been introduced into the depression according to the invention, the respective coin can be finished, for example by embossing the front and the back. The security feature 6 can, however, also only be introduced after the coin has been embossed, wherein the depressions can be made in the coin before or after the embossing. Figure 6 shows an example of an apparatus for carrying out the method for checking coins. The device has a ramp 10 inclined relative to the horizontal, along which a coin (dashed line), for example inserted into an input slot of a machine, can roll or slide following the force of gravity in the direction of the arrow drawn and can pass a measuring system, which is described in more detail below is described.

The measuring system has a first light emitting diode 11 for generating excitation light 12, which is focused on the edge 4 of the coin body 1 of the coin and can stimulate the security feature located in the depressions on the edge 4 of the coin to emit emission light 13.

The emission light 13 is detected by a photodiode 15, possibly after passing through a filter 14, and converted into a corresponding measurement signal S1. At the same time, the passage of the coin body 1 through the excitation light beam 12 of the first light-emitting diode 11 is measured with the aid of a second photodiode 16 which is arranged opposite the first light-emitting diode 11. The further photodiode 16 is darkened by the light beam 12 at the moment the coin body 1 rolls through and thus also supplies a measurement signal S2, which is fed to an evaluation device 17. The measurement signal S2 of the second photodiode 16 can be used as a trigger signal for the detection of the emission light 13.

The Figures 7 and 8 show examples of the time course of the measurement signals S1 and S2 obtained in this way.

When a coin which has the security feature according to the invention passes through the measuring system, the in Figure 7 shown Measurement signals, the measurement signal S1 corresponding to the emission light 13 excited at the time of passage in the depressions in the edge of the coin and detected by the first photodiode 15, and the measurement signal S2 corresponding to the light barrier signal generated by the second photodiode 16, which at the time of passage due to the darkening of the second photodiode 16 decreases through the coin.

If, on the other hand, a coin that does not have the security feature according to the invention passes through the measuring system, the results in Figure 8 measurement signals shown. The measurement signal S2 corresponds to the light barrier signal generated by the second photodiode 16, which decreases at the time of passage due to the darkening of the second photodiode 16 by the coin. The measurement signal S1, on the other hand, shows no change due to the absence of emission light at the time of passage.

To improve the detection, the device can be provided with additional light-emitting diodes for multiple verification of the authenticity of the coins. Furthermore, it is possible to provide lenses for improved focusing of the excitation light 12 and further optical filters. As an alternative to the light-emitting diode 11 shown in the example, a laser can also be used as the excitation light source.

The first and / or second photodiode 15 or 16 can, if necessary, also be replaced by a spatially resolving detector which has a multiplicity of detector elements arranged in a line or area. The emission light emanating from the edge of the coin can thereby be detected in a spatially resolved manner, so that information relating to the shape and / or size of the light-emitting areas can be derived from it. In particular it is possible to compare the one- or two-dimensional images captured in this way with reference images. This is of particular advantage if the luminescent areas are in the form of letters, numbers or other symbols.

With the device shown, it can be determined in a simple manner whether a coin has a security feature introduced into the edge 4 of the coin body 1. The speed at which the security feature can be measured is mainly limited by the speed of the coin, i.e. the faster the coin can roll through the measuring system, the faster the measurement is completed and the device is ready for testing the next coin. This enables a machine to determine the authenticity of coins with measurement times of preferably less than 10 milliseconds per coin, in particular less than 5 milliseconds per coin. This is of particular advantage in the case of devices which are provided for checking large quantities of coins and are used, for example, in commercial or central banks.

Claims (14)

1. Coin with a disc-shaped coin body (1), which has an edge (4), wherein in the edge (4) of the coin body (1) at least one recess (5) is provided, in which at least one luminescent substance (6) is provided, characterized in that the coin body is made of metal or a metal alloy, and the luminescent substance is introduced into the recess with the help of an organic resin or with the help of adhesive systems, in which the luminescent substance is dissolved or dispersed.
2. Coin according to claim 1, wherein the edge (4) of the coin body (1) has an edge surface, in which the at least one recess (5) is provided, in particular inserted.
3. Coin according to claim 1 or 2, wherein the at least one recess (5) is hole-shaped.
4. Coin according to one of the preceding claims, wherein the at least one recess (5) has an opening (7) located at the edge (4) of the coin body (1).
5. Coin according to claim 4, wherein the opening (7) located at the edge (4) of the coin body (1) has the shape of a symbol, in particular of a letter and/or a number.
6. Coin according to one of the preceding claims, wherein the at least one recess (5) has a cross-section, which increases from the edge (4) towards the interior of the coin body (1).
7. Coin according to one of the preceding claims, wherein the luminescent substance (6) comprises a photoluminescent, in particular a fluorescent and/or phosphorescent, substance.
8. Coin according to one of the preceding claims, wherein the resin, which in particular is provided with a dye additive, together with the luminescent substance (6) dispersed or dissolved therein, is visible to the naked eye.
9. Coin according to one of the preceding claims, wherein the resin together with the luminescent substance (6) dispersed or dissolved therein is transparent and/or not or hardly visible to the naked eye.
10. Coin according to one of the preceding claims, wherein the luminescent substance (6) comprises two or more luminescent substances.
11. Coin according to claim 10, wherein a first luminescent substance can absorb electromagnetic radiation in a first spectral region, and a second luminescent substance, after excitation by electromagnetic radiation, can emit emission light in a second spectral range, wherein the first and second spectral range at least partially overlap.
12. Coin according to one of the preceding claims, wherein the luminescent substance (6) or the luminescent substances is or are, respectively, applied to an inorganic carrier.
13. Method for examining a coin according to one of the preceding claims, characterized in that
    the coin, in particular the edge of the coin body (1), is irradiated with electromagnetic radiation (12),
    electromagnetic radiation (13) emanating from the coin, in particular emission light emanating from the edge (4) of the coin body (1), is detected by a detector (15) and converted into a detector signal (S1), and the detector signal (S1) is used for an examination of the coin.
14. Method for producing a coin comprising a disc-shaped coin body (1), which has an edge (4),
    characterized in that
    the coin body is made of metal or a metal alloy, and the edge (4) of the coin body (1) is provided with at least one recess (5), into which at least one luminescent substance (6) is introduced, wherein the luminescent substance is introduced into the recess with the help of an organic resin or with the help of adhesive systems, in which the luminescent substance is dissolved or is dispersed.

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