EP0680411A1

EP0680411A1 - Document with doped optical safety mark, stratified composite paper for producing the same and device for checking the authenticity of the document

Info

Publication number: EP0680411A1
Application number: EP93924429A
Authority: EP
Inventors: Erich Berger; Peter Fajmann
Original assignee: Osterreichische National Bank
Current assignee: Osterreichische National Bank
Priority date: 1992-11-18
Filing date: 1993-11-17
Publication date: 1995-11-08
Anticipated expiration: 2013-11-17
Also published as: CA2149550A1; JPH08506772A; DK0680411T3; ES2115081T3; AU691475B2; DE59308150D1; ATA229892A; US6165592A; ATE163159T1; MX9307182A; DK0680411T4; ES2115081T5; WO1994011203A1; EP0680411B1; AT403967B; AU5411894A; EP0680411B2; CA2149550C; RU95112499A

Abstract

PCT No. PCT/AT93/00176 Sec. 371 Date Jul. 13, 1995 Sec. 102(e) Date Jul. 13, 1995 PCT Filed Nov. 17, 1993 PCT Pub. No. WO94/11203 PCT Pub. Date May 26, 1994A document, for example a bank note, a check, a credit card, an identification document or a ticket, bears an optical safety mark in the form of a light-reflecting and light-diffracting and/or refracting layer, for example a hologram, an interference layer, a (computer-generated) refracting structure, located on at least parts of the document. The optical safety mark is arranged in a sandwich structure which is fixed to the document by means of an adhesive layer and if required has one or several transparent layers arranged in the sandwich structure. The adhesive layer and/or transparent layer in the sandwich structure is doped with at least one luminescent substance.

Description

Document with a doped optical security feature. Layered composite for its production and test facility for checking the authenticity of the document

The invention relates to a document, e.g. Bank note, check, credit card, ID card or ticket, which has an optical security feature in the form of a light reflecting and diffractive and / or refractive layer provided at least in some areas, e.g. a hologram, an interference layer, a (computer-generated) diffraction structure or the like. The optical security feature is provided with doping material and is present in a film structure which is attached to the document by means of an adhesive layer and optionally has at least one transparent layer in the film structure.

Furthermore, the invention is concerned with a film structure for the production of such documents, with a carrier film and a transfer layer which can be detached therefrom and which at least contains the light reflecting and / or refractive and / or refractive layer forming the embossed optical security feature, in particular as an embossing film, preferably as Hot stamping foil is formed, and has an adhesive layer on the side of the reflective layer facing away from the carrier film, it being possible for at least one transparent layer to be arranged in the film structure. Documents of the type mentioned at the outset are, for example, from CH-PS 661

602 known. Embossing foils used for the production of such documents of value, in particular hot embossing foils, are e.g. described in DE 34 22 910 Cl.

The known documents or embossing foils have a diffraction-optically effective structure, which serves primarily as a security feature against color copying, with such diffraction-optically effective, i.e. Light reflecting, diffractive and / or refractive structures have the basic advantage that they can be recognized with the unarmed eye, but can also be read by machine. Typical structures applied in particular to banknotes include Kinegrams and pixelgrams. The falsification of such structures is very difficult, but is still feasible, if possible, the corresponding

ERSÄTZBLÄIT (RULE 26) to expose the structured surface and electroplate it or copy it phototechnically.

In order to make documents forgery-proof, the use of luminescent layers in the documents has been proposed. For example, DE-OS 37 41 179 discloses the use of two security features, namely a relief embossed on paper and thus already palpable and second as a relief

Safety feature luminescent substances on the peaks or in the valleys of the relief. In the subject of DE-OS 37 41 179 can from a transfer belt

Use can be made, the layers of which can be applied to the document by means of an adhesive layer, wherein the transfer tape can contain a color layer made of a luminescent substance, but also a color pigment layer in addition to this luminescent layer.

DE-OS 39 06 695 shows the embedding of a tape serving as a security element in a document. The tape consists of a translucent plastic film which is provided with characters or patterns in the form of cutouts, luminescent substances additionally being arranged in areas which are congruent with the cutouts. There are therefore two security elements here too, namely the signs and patterns and the luminescent substances. Finally, according to DE-PS 27 54 267 there are two documents

Security features exist, one of which has luminescent properties. In contrast to the brilliant, superficial optical features, however, it is a question of threads, leaves and fibers incorporated into the paper.

The state of the art that has become known can thus be summarized to the extent that it is known to use luminescent substances on the one hand in the application area of the non-optical features by (partial) printing, coating, embossing or also with transfer ribbon transfer and on the other hand in the application area of the optical features (e.g. reflective lattice structure with a number of lines of approximately 1000 / mm and line depth of approximately 100

SPARE BLADE (RULE 26) nm) to apply those for securing documents with protective coatings that cover the surface.

In previous approaches to machine detection of optical features, the focus was on the obvious optical reading of the lattice structures or information or image content, which not only involves a considerable technical effort for reading the multidimensional information, but also the effects of damage, such as occur in the banknote circulation and lead to the destruction of the structures and thus to the disadvantageous illegibility of the feature authenticity. Corresponding falsification of the impression of the optical feature would also not be able to be detected with such detection.

The object of the invention is now to be able to carry out the authenticity detection of the optical feature applied to a document by verifying the authenticity independently of an existing (forged) hologram lattice structure and to design the optical feature in such a way that reliable machine detection in the high-speed range ( 10 m / sec) without incorrect readings and resulting rejections can be guaranteed. Documents should therefore only be rejected as suspicious if there is an imitation of the optical feature or if it is completely missing. On the other hand, documents with damaged optical characteristics are to be steered into a storage compartment for unusable documents during the sorting process and accordingly should not cause any considerable effort in the form of manual processing, as is necessary for rejections. This object is achieved in a document of the type mentioned at the outset in a surprisingly simple manner if, according to the invention, the adhesive layer and / or transparent layer in the film structure is doped with at least one luminescent substance. It is also possible that different luminescent substances are contained in the adhesive and / or transparent layer in the film structure.

SPARE BLADE (RULE 26) The inventive design of the document on the one hand enables a simple and thus extremely cost-effective authenticity measurement arrangement and on the other hand achieves a completely negligible rejection rate in the mechanical processing of the documents. In addition, there is the advantage that a high-quality, professional falsification of the structure of the optical feature is deliberately machine-recognizable and, in the case of counterfeit banknotes, it can be eliminated or recognized by the sorting process or by a trained cashier.

The incorporation of the luminescent substances into the adhesive layer (doping of the adhesive layer) has the advantage that in the event of a manipulation attempt on the optical security feature, e.g. the attempt to lift off or peel off, parts of the adhesive layer and thus of the doping material still adhere to the document. Furthermore, the adhesive layer with its thickness of about 6 μm is the thickest layer in the film structure. Many luminescent materials, such as rare earths, are of an inorganic nature and have to be ground, whereby with particle sizes below 5 μm they significantly lose or lose their luminescent properties. Many of the luminescent pigments suitable for circulating banknotes with sufficient aging, UV and chemical resistance can only be produced with particle sizes above about 5 μm. If one were to incorporate such materials into a protective layer (to be applied later) on the document, this would give rise to, among other disadvantages, a reduction in the brilliance and to a thickening of the document or the paper stack, which is disadvantageous in terms of production technology. The technologically required, complex process control of the adhesive coating can ensure that the luminescent material is incorporated in the optical feature in a constant layer thickness or concentration. The doping material is protected against UV radiation under the metallic reflection layer. Preference is given to luminescent substances which cannot be determined with normal daylight, but which can be determined using a corresponding UV lamp or other electromagnetic radiation source.

ERSÄΓZBLAΠ (RULE 26) The addition of luminescent substances in the transparent layer, but above all in the adhesive layer, has the advantage over structures that are, for example, purely optically diffractive that the security feature can still be determined even if the document or the film structure, for example mechanically, is badly damaged . If a forger succeeds in transferring the diffraction-optically effective structure to a counterfeit value document, the counterfeit would still be detectable because of the lack of luminescent properties on the counterfeit document, but with the original diffraction-effective structure. The inventive admixture of luminescent substances to the adhesive and / or a transparent layer in the film structure can be implemented practically without additional effort in the usual production of the documents or the film structure and thus offers a very substantial increase in the security effect without noticeable additional costs. If necessary, the doped adhesive layer can also be applied retrospectively to the prefabricated optical security feature present on the carrier film or, in advance, to the carrier material, in particular paper, at the paper or document manufacturer for safety or production-technical considerations. If, as is possible according to the invention, the luminescent

Substances in the adhesive and / or transparent layer in the film structure are only provided in certain areas, preferably in a certain, preferably machine-readable pattern, additional security options are offered because then not only a general admixture of the luminescent substances to the adhesive or transparent layer in the Foil construction is sufficient, but additionally the luminescent substances have to be introduced in a very specific way, which is only possible using special machines.

Luminescent substances are expediently fluorescent or phosphorescent, the decision for the use of fluorescent or phosphorescent substances depending on the intended use

SPARE BLADE (RULE 26) depends, but possibly there is also the possibility of using fluorescent and phosphorescent substances together, if necessary to provide each of the substances in a specific pattern.

As luminescent substances which are particularly suitable for the purposes of the invention, narrow-band fluorescent substances, e.g. from the

Group of rare earths proven. Fluorescent substances with very closely adjacent emissions compared to the excitation wavelength and those with the same emission wavelength can also be used advantageously. The presence or

The absence of such substances can be ascertained with great accuracy using known measuring devices, with the use of luminescent substances already differing in their luminescent properties

Deviate slightly from original substances, can be reliably determined, above all because the radiation devices used in checking the value documents etc. can be adapted very precisely to the substances to be tested. In a film structure according to the invention, it is advantageous if the

Adhesive layer is formed by a hot melt adhesive, which is then the usual

Application process for hot stamping foils easily produces reliable adhesion.

In a film construction according to the invention, the transparent layer in the film construction expediently consists of one of the transparent lacquers known per se.

In order to ensure that the light reflecting layer forming the optical security feature also reliably reflects the light, it is provided according to the invention that the reflecting layer consists of a thin metal layer, preferably formed by vacuum evaporation, e.g. one

Aluminum layer is formed.

In a film structure according to the invention, it is finally provided that a release layer, e.g. a wax layer is arranged.

SPARE BLADES (RULE 26) Another object of the invention is a test facility for documents. This device has one or more receivers, which can be designed, for example, as photodiodes, photomultipliers, CCD arrays, and are provided for detecting emissions that originate from the luminescent substances present on the document, at least one source for stimulating the luminescent substances , for example a laser tube, laser diodes, light emitting diodes, fluorescent tubes, halogen lamps, X-ray tubes, electron beam tubes and radioactive emitters can be provided. The test device can also be set up to detect several measuring points on one and the same document. In such cases, deflection devices are provided for the exciting and / or emitted radiation. Galvanometer mirrors or general optical scanners can be considered as deflection devices. Acousto-optical modulators can also be used for these purposes. The emitted radiation is split up into multiple measuring channels by divider mirrors, to which different filters and / or receivers are assigned. Evaluation devices for the signals received by the receiver are then provided on the receiver.

Further features, details and advantages of the invention result from the following description of preferred exemplary embodiments with reference to the drawing. Show it:

1 schematically shows a document of value in the form of a modified Austrian banknote worth S 5,000, which has the features according to the invention,

Fig. 2 shows a section along line II-II through the value document of FIG. 1, on an enlarged scale, the

3 and 4 schematically in section two different embodiments of an embossing film,

5 shows a luminescence test device for testing in incident light, and

6 shows a further luminescence test device, but for testing in transmitted light.

ERSÄΓZBLÄΓT (RULE 26) 1 has banknote paper as the carrier 1, however, in the case of differently designed value documents, the carrier can also be synthetic paper, a plastic film or, in the case of a credit card, also a plastic card. A plastic card can have the name of the holder and an identification number in embossed letters on the front, for example. The document of value 1 has a local security feature which is present in a film structure, which can be a layer composite 4, which is shown in FIGS. 3 and 4, where it is designed as an embossing film.

In the layer composite 4 there is an optical security feature, namely a light reflecting and diffractive and / or refractive structure, which is formed, for example, by a thin metal layer 5, which in the embodiment of FIGS. 1 and 2 is between a transparent layer 6 shown as the topmost one Layer composite 4 and an adhesive layer 7 is embedded. The adhesive layer 7 serves to fix the layer composite 4 on the surface of the document 1. The transparent layer 6 in the layer composite 4, which is drawn as the uppermost layer in the exemplary embodiment (FIG. 2), covers the structure which is formed by the metal layer 5 and has an optical diffraction structure and thus makes it considerably more difficult to attempt to falsify the structure.

The peculiarity of the document of value according to the invention can now be seen in the fact that luminescent substances are present in the adhesive layer 7. Such substances can also be provided in the transparent layer 6. As in the embodiment of FIG. 1, they can only be provided in some areas, namely in area 8, where a head representation is located in the exemplary embodiment. A preparation made from narrow-band fluorescent rare earths can be used as the substance.

The security feature in the value document according to FIG. 1 thus not only consists of the diffraction-optically effective, possibly specially shaped structure in the metal layer 5, but additionally in the layer composite 4 of the

Areas with luminescent properties are present,

SPARE BLADE (RULE 26) these properties can also be determined and checked mechanically by reading devices.

In principle, the optical security feature with luminescent properties according to the invention can be applied to documents of value in any manner, for example also by the layers of the layer composite 4 being applied one after the other.

However, it is much more expedient if the layer composite 4, as shown schematically in FIGS. 3 and 4, is applied to a carrier film 9 and is used as an embossing foil, advantageously as a hot stamping foil.

10 Such hot stamping foils can, for example, as in DE. 34 22 910 Cl described, be built. They have a carrier film 9 on which, with the interposition of a release layer 10 made of wax, the transfer layer designated as a whole with 11 or 11 'is arranged. When the layered composite 4 is applied to the document 1, the transfer layer 11 or 11 'with its from

15 carrier film 9 facing surface pressed on the document 1, under the action of heat, on which it then adheres by means of the adhesive layer 12 or 12 '. The carrier film 9 is then removed immediately, which is made easier by the wax release layer 10.

In the stamping foils shown in FIGS. 3 and 4, the transfer position exists

20 11 or 11 'from an adhesive layer 12 or 12' and from a transparent layer 13, 13 ', in the layer composite. Arranged between the adhesive layer and the transparent layer is a reflective layer 15 made of metal, which has an optically diffractive, i.e. Has light refractive or diffractive structure 14. During the production of the layer composite 4 (the stamping foils)

25 again in accordance with DE 34 22 910 C1, first the release layer 10 and then the transparent layer 13 or 13 'are applied to the carrier film 9 in the layer composite. The surface of the transparent layer 13, 13 'facing away from the carrier film 9 is introduced with the desired light-refractive or diffractive structure 14. The structured surface of the transparent layer is then metallized to produce the reflective layer 15,

SPARE BLADE (RULE 26) for example by vacuum deposition of aluminum. The layer composite 4 is then completed by applying the adhesive layer 12, 12 '.

A simplified embodiment for subordinate applications would also be conceivable, in which the transfer layer 11 or 11 'consists of only one layer, which simultaneously fulfills the optical and the adhesive function.

In the layer composite 4 according to FIG. 3, luminescent substances are present in regions 16 of the adhesive layer 12. The reflective layer 15 made of metal can be interrupted in these areas. However, embodiments are also possible in which the carrier 1 is transparent in order to be able to check for the presence of the luminescent substances from the underside of the carrier, in particular if the carrier 1 is a plastic card. For example, in the embodiment of FIG. 1, the luminescent regions 16 could also be present outside the metal layer 5.

According to Fig. 4, the luminescent substances are in the transparent layer 13 ', e.g. in regions 16 ', which correspond to the regions 8 formed by the head in FIG. 1.

Of course, the luminescent substances can also be in the entire transparent layer 13, 13 'or entire adhesive layer 12, 12 * be present, which is quite sufficient for certain security purposes. It should also be pointed out that a wide variety of substances, for example fluorescent and phosphorescent substances, can also be used as luminescent substances, even in different mixtures.

The group of organic luminescent pigments includes an almost colorless benzoxazine derivative, typically fluorescent at 545 nm, which is sold by Riedel-de Haen under the name Lumilux CD 304.

The series of fluorescent substances in the form of solutions includes a heterocyclic thioxanthene dye, which is sold by Bayer under the trade name Macrolexfluorescence Red GG.

SPARE BLADE (RULE 26) Rare earths are phosphorescent and have very typical absorption and emission spectra with narrow-band emission lines. Examples include scandium, yttrium and, from the lanthanides, europium.

A suitable mixture of luminescent substances or a mixture with absorbing substances provides doping materials that are visible

Do not luminesce the area. Different substances are used for this, in which absorption lines of the one overlap with the emission lines of the other in the visible range.

Fluorescent substances with very closely adjacent emissions compared to the excitation wavelength are also known. Resonance fluorescence is a special case where the absorption is equal to the emission line.

Furthermore, luminescent materials in the form of organic semiconductors based on conjugated polymers (carbon chains in which double and single bonds alternate) are known as poly-p-phenylene-vinylene, the electroluminescence being stimulated by the application of an electrical voltage, in particular for static or quasi-static tests can be used.

Adhesives that contain luminescent substances can include the following

Formulations have: Example 1 (numerical values in parts by weight)

Methyl ethyl ketone 250

Toluene 395

Ethyl alcohol 150

Vinyl chloride-vinyl acetate

Copolymer (mp:> 65 ° C) 110

Unsaturated polyester resin (mp: 100 ° C) 30 wetting agents (40% in butyl acetate)

(high molecular polymer) 10

Filler (SiOj) 5

Illuminated pigment (type: Lumilux C, <5 μ;

Riedel-de Haen) 50

Example 2 (figures in parts by weight) acetone 180

Toluene 70

EKSÄΓZBLAΓT (RULE 26) Ethyl alcohol 380

Methyl / butyl methacrylate

(Tg = 80 ° C) 60

Ethyl methacrylate

Butyl / methyl methacrylate

Copolymer

(40% in xylene) (Tg = 78 ° C) 180

Wetting agent (40% in butyl acetate)

(High molecular polymer) 10

Filler (SiO ₂ ) 10

Luminous pigment

(Type: Lumilux C, <5 μ;

Riedel-de Haen) 60

The test device shown in FIGS. 5 and 6 has at least one receiver 17 for emissions of the luminescent substances present on the document and at least one source 3 for excitation of the luminescent substances. Depending on the required spectral range and depending on the field of application of the test device according to the invention (for example also for banknote validators in the service range), lasers, laser diodes, light-emitting diodes, fluorescent tubes, halogen lamps, but also X-ray tubes, electron beam tubes and radioactive substances, etc. can be used as source 3 to excite the luminescent substances . For the operation of source 3, if tests are carried out in several spectral ranges (i.e. there is a multi-channel version of the test device), it is also possible to work in pulse mode. The receivers 17 for measuring the emissions of the luminescent substances can be photodiodes, photomultipliers and CCD arrays.

In the exemplary embodiments shown in FIGS. 5 and 6, an optical column 2 is arranged between the document to be checked and the receiver 17. A filter 18 is located in the beam path of this optical column in front of the receiver 17. In the case of designs with polychromatic illumination from the source 3, filters 18 can be used as filters 18, interference filters, edge bandpass filters or combinations of such filters. This provides information about the significant spectral light distribution. Instead of an optical one

SPARE BLADE (RULE 26) Columns can be used between the document and the receiver 17, in particular when carrying out areal measurements, optical fibers and fluorescent plates. Such fluorescent plates consist of transparent plastic, in which fluorescent dye molecules are arranged, which are excited by the radiation going from the document to the receiver 17.

Fig. 6 shows a test device operating in transmitted light mode, i.e. the receiver and the source for the irradiation of the luminescent substances are on different pages of the document. The direction of movement of the document is designated by P in FIGS. 5 and 6. From Fig. 6 it can also be seen that in the event that on the

Document as a luminescent substance are phosphorescent substances, a distance s is present between the illumination levels or their intersection with the document to be checked and the optical axis (receiver level). This distance can be, for example, 5-10 mm. If the receiver plane is about 8 mm downstream of the illumination plane in the direction of movement P of the document, the luminescence measurement of the afterglow phosphorescent material is carried out with a delay of 1 msec at a document speed of 8 m / sec. If several measuring points are to be recorded on one and the same document in the test arrangement, optical scanners can be used to deflect the illumination and the emitted light. For example, galvanometer mirrors can be used as optical scanners. Acousto-optical modulators can also be used to deflect the radiation from the irradiation device 3.

Splitter mirrors can be used to split the luminescent light in incident light measurement or in transmitted light measurement into several measurement channels, for example equipped with different filters 18 or receivers 17.

SPARE BLADE (RULE 26)

Claims

Claims:

1st document, e.g. Bank note, check, credit card, ID card or ticket, which has an optical security feature in the form of a light reflecting and diffractive and / or refractive layer provided at least in some areas, e.g. a hologram, an interference layer, a (computer-generated) diffraction structure or the like, the optical security feature being present in a film structure which is attached to the document by means of an adhesive layer and optionally has one or more transparent layers in the film structure, thereby characterized in that the adhesive layer (7; 12, 12 ') and / or transparent layer (6, 13, 13') in the film structure (4) is doped with at least one luminescent substance.

2. Document according to claim 1, characterized in that in the adhesive (7; 12, 12 ') and / or transparent layer (6, 13, 13') in the film structure (4) different luminescent substances are contained.

3. Document according to claim 1 or 2, characterized in that the luminescent substances in the adhesive (7; 12, 12 ') and / or the transparent layer (6; 13, 13') of the film structure (4) are only provided in certain areas are.

4. Document according to claim 3, characterized in that the luminescent substances in the adhesive (7; 12, 12 ') and / or the transparent

Layer (6; 13, 13 ') of the film structure (4) in a certain, preferably machine-readable pattern (8; 16') are provided.

5. Document according to one of the preceding claims, characterized in that the luminescent substances are fluorescent or phosphorescent substances or mixtures of such substances, where appropriate the fluorescent substances are arranged in a pattern which is different from the pattern in which the phosphorescent substances are arranged, is different.

6. Document according to claim 5, characterized in that narrow-band fluorescent rare earths serve as luminescent substances.

SPARE BLADE (RULE 26)

7. Film structure for the production of a document of value according to one of claims 1 to 6, with a carrier film and a transfer layer detachable therefrom, which at least forms the optical security feature, light reflecting and diffractive and / or refractive layer, in particular as an embossing film, preferably as Hot stamping foil, is formed and has an adhesive layer on the side of the reflective layer facing away from the carrier film, wherein a transparent layer, preferably between the reflective layer and the carrier film, can be arranged in the film structure, characterized in that in the adhesive layer (12, 12 ') and / or luminescent substances are contained in the transparent layer (13, 13 ').

8. A film structure according to claim 7, characterized in that different luminescent substances are contained in the adhesive (12, 12 ') and / or the transparent layer (13, 13').

9. A film structure according to claim 7 or 8, characterized in that the luminescent substances in the adhesive (12, 12 ') and / or in the transparent

Layer (13, 13 ') are only provided in certain areas.

10. A film structure according to claim 9, characterized in that the luminescent substances in the adhesive (12, 12 ') and / or in the transparent layer (13, 13') are provided in a certain, preferably machine-readable pattern (16 ') are.

11. A film structure according to one of claims 7 to 10, characterized in that the luminescent substances are fluorescent or phosphorescent substances or mixtures of such substances, where appropriate the fluorescent substances are arranged in a pattern which is different from the pattern in which the phosphorescent substances are arranged, is different.

12. A film structure according to claim 11, characterized in that narrow-band fluorescent rare earths serve as luminescent substances.

13. Foil structure according to one of claims 7 to 12, characterized in that the adhesive layer (12, 12 ') is formed by a hot melt adhesive.

SPARE BLADE (RULE 26)

14. Film structure according to one of claims 7 to 13, characterized in that the transparent layer (13, 13 ') is a layer of a transparent lacquer.

15. Foil structure according to one of claims 7 to 14, characterized in that the reflective layer (15) is formed by a thin metal layer preferably formed by vapor deposition in a vacuum.

16. Foil structure according to one of claims 7 to 15, characterized in that between the carrier film (9) and the transfer layer (11, 11 ') a release layer (10), e.g. Wax layer, is arranged.

17. Test device for a document according to one of claims 1 to 6, characterized by at least one receiver (17), e.g. Photodiodes,

Photomultiplier, CCD arrays, for measuring the emissions of the luminescent substances present on the document and at least one source (3), e.g. a laser tube, laser diodes, light emitting diodes, fluorescent tubes, halogen lamps, X-ray tubes, electron beam tubes and radioactive emitters, for the excitation of the luminescent substances.

18. Test device according to claim 17, characterized in that an optical column (2), preferably with a filter (18) arranged in the beam path in front of the receiver (17), is arranged between the document to be checked and the receiver (17).

19. Testing device according to claim 17, characterized in that between the document to be checked and the receiver (17) optical fibers for guiding the radiation emitted by the luminescent substances or fluorescent plates, in particular made of plastic with embedded fluorescent dye molecules, are arranged.

20. Test device according to one of claims 17 to 19, characterized in that in the case of phosphorescence measurement, in particular in transmitted light, a distance (s), e.g., between the illumination planes or their intersection with the document to be tested and the measuring point. 5 - 10 mm is present.

21. Testing device according to one of claims 18 - 20, characterized in that, in particular with polychromatic lighting, as

SPARE BLADE (RULE 26) Interference, edge, bandpass filter trained filters are arranged in front of the receiver or combinations of the aforementioned filters.

22. Test device according to one of claims 17 to 21, characterized in that for the detection of several measuring points on a document, optical scanners, e.g. Galvanometer mirrors or acousto-optical modulators are provided for deflecting the exciting and / or received radiation.

23. Test device according to one of claims 17 to 22, characterized in that divider mirrors are provided for splitting the emitted radiation of the luminescent substances into a plurality of measuring channels, the measuring channels being assigned different filters and / or receivers.

SPARE BLADE (RULE 26)