Copy carrier arrangement and method for producing a hologram

Abstract

Disclosed is a copy carrier arrangement which has a copy carrier, which comprises a photosensitive material, and a black cover (20) arranged on at least one side of the copy carrier (13), which comprises light absorbing carbon black particles and carrier material. A difference in refractive index between the copy carrier (13) and the carrier material at an interface between the black cover (20) and the copy carrier (13) is less than 0.2.

Description

[0001] Description

[0002] Copy carrier arrangement and method for producing a hologram

[0003] The present application relates to copy carrier arrangements for producing holograms and to methods for producing holograms using such copy carriers.

[0004] Modern micro-optical processes allow complex tasks such as imaging or the monitoring of a specific environment, for example, using holographic optical elements (HOEs), to be discreetly or almost invisibly integrated into large-format glass surfaces. Examples of applications include all types of transparent displays (e.g., in shop windows, refrigerated cabinets, side or front windows of motor vehicles), lighting applications such as information and warning signals in any glass surface (e.g., designer glazing of buildings), or light-sensitive detection systems, for example, for interior surveillance (eye tracking in vehicles and the presence status of people indoors). To manufacture the required holographic optical elements, it is important to manufacture them in a way that enables series production.

[0005] One way to copy holograms is to attach a so-called master hologram to or on an optically transparent cylindrical roller or an optically transparent hologram carrier. For copying, it is also necessary to attach unexposed, holographically suitable material to or on the hologram carrier. This unexposed, holographically suitable material, possibly together with other components such as carriers, is referred to below as the copy carrier.

[0006] The hologram is copied by illuminating the master hologram with the light required to reconstruct the master hologram, the reference beam. The copy carrier and the master hologram must not have any relative speed to each other in the area to be exposed. The reference beam simultaneously illuminates the previously unexposed material of the copy carrier into which the master hologram is to be copied. This creates an interference field in the copy carrier which is created by the reference beam and the reconstructed optical function of the master hologram, i.e. light diffracted by the master hologram according to its function, which interferes with the reference beam. Ideally, this interference field is identical to the microstructure in the master hologram, so that the structure of the master hologram is exposed into the previously unexposed material of the copy carrier.

[0007] In reality, this process creates additional optical transitions and interfaces due to unavoidable refractive index differences between the individual layers of the copy structure. These can lead to reflections, which in turn generate additional interference fields in the copy substrate. The most critical transitions with the strongest reflections are the transitions between the optically transparent materials, e.g., the copy substrate or the master hologram, and the air.

[0008] In this regard, it is known to provide interfaces, particularly with air, with blackened portions, i.e., light-absorbing material, in order to absorb light. Such blackened portions are known from EP 3 772 671 A1 or EP 2 801 867 A1. However, an interface with such blackened portions can also lead to reflections.

[0009] It is therefore an object of the present application to propose possible improvements in this regard.

[0010] This object is achieved by a copy carrier arrangement according to claim 1 or 9 and a method for producing a hologram according to claim 22. The subclaims define further embodiments and a device with such a copy carrier arrangement.

[0011] According to a first aspect, a copy carrier assembly is provided, comprising: a copy carrier comprising a photosensitive material, and a black cover arranged on at least one side of the copy carrier and comprising light-absorbing carbon black particles and carrier material, wherein a refractive index difference between the copy carrier and the carrier material at an interface between the black cover and the copy carrier is less than 0.2.

[0012] In the context of this application, a black cover is understood to mean an absorbent covering of a surface. A copy carrier is a unit into which a hologram is to be copied by exposure. Such a small refractive index difference at least largely suppresses reflections at the interface. High absorption can be achieved by using soot particles, particularly over a broad wavelength range. The refractive index difference is preferably less than 0.02, more preferably less than 0.01, to further suppress reflections.

[0013] "At least one side" means that the black cover can extend over two or more sides of the copy carrier assembly. Furthermore, in a system described below, it can also extend over one or more sides of a master hologram and, if applicable, a carrier.

[0014] The reflection factor of the black cover is preferably less than 0.05%.

[0015] The carrier material may comprise a matrix in which the soot particles are arranged, for example made of polymer material.

[0016] The interface can be a surface of the matrix facing the copy carrier. In this case, the above-mentioned refractive index difference is a refractive index difference between the matrix material and the copy carrier.

[0017] The carrier material may comprise an adhesive film, with the interface being a surface of the adhesive film facing the copy carrier. In this case, the aforementioned refractive index difference is therefore a refractive index difference between the material of the adhesive film and the copy carrier. The adhesive film can detachably bond the black cover to the copy carrier.

[0018] The adhesive strength of the adhesive film is preferably less than 60 cN / cm. Such a low adhesive strength allows the black cover to be removed relatively easily after exposure.

[0019] The copy carrier may comprise a photopolymer arranged on a carrier film.

[0020] The interface can be a surface of the photopolymer facing the black cover. In this case, the above-mentioned refractive index difference is therefore a refractive index difference between the photopolymer and the black cover (for example, the above-mentioned matrix or the adhesive film). The copy carrier can have a cover film on the photopolymer, wherein the interface is a surface of the cover film facing the black cover. In this case, the above-mentioned refractive index difference is therefore a refractive index difference between the cover film and the black cover (for example, the above-mentioned matrix or the adhesive film).

[0021] The soot particles can be smaller than 500 nm, not structurally reduced and / or have a BET surface area according to ASTM D 6556 of greater than 200 m 2 / g. Such soot particles can achieve low reflection and high absorption of light.

[0022] According to a second, alternative aspect, graphene particles and / or nanotubes are used instead of or in addition to the soot particles described above. Otherwise, the second aspect corresponds to the first aspect described above, i.e., apart from the use of graphene particles or nanotubes instead of or in addition to the soot particles, the copy carrier arrangements of the second aspect are identical to those of the first aspect.

[0023] Graphene is a carbon modification consisting of one or more 2D layers of six-carbon rings. Nanotubes are essentially formed from graphene layers into a tube, with a diameter typically less than 100 nm.

[0024] These types of particles (graphene or nanotubes) can be provided as a slurry, in which the particles are suspended in a solvent. This solvent can be selected to match the other materials of the copy carrier assembly. For this purpose, an original solvent can be replaced with a more suitable one. For this purpose, one solvent can be removed in a heating bath under vacuum, and then another solvent can be added. This can also be done in multiple steps.

[0025] In addition, an apparatus for producing holograms is provided, comprising: a master hologram, and a copy carrier arrangement arranged on the master hologram as explained above.

[0026] The black cover can cover a side of the copy carrier arrangement facing away from the master hologram and at least one side surface of the copy carrier arrangement and the master hologram, optionally also other surfaces of the device. The device can then have a light source, wherein, upon illumination by the light source, a structure of the master hologram is exposed into the photosensitive material.

[0027] According to a further aspect, there is provided a method for producing a hologram, comprising:

[0028] Arranging a copy carrier on a master hologram,

[0029] Arranging a black cover on at least one surface of the copy carrier to form a copy carrier assembly as described above, and

[0030] Exposing the copy carrier with an interference pattern generated by the master hologram.

[0031] With such a process, holograms can be produced while suppressing disturbing reflections.

[0032] The invention will be explained in more detail below with reference to preferred embodiments in the accompanying drawings. They show:

[0033] Figure 1 is a schematic diagram of an apparatus for producing holograms according to an embodiment.

[0034] Figure 2 is a schematic diagram of a copy carrier with a black cover according to an embodiment.

[0035] Figures 3A to 3C are schematic diagrams of copy carriers with black covers according to various embodiments.

[0036] Figure 4 is a schematic diagram of a black cover according to some embodiments.

[0037] Figure 5 shows a flowchart illustrating a method according to one embodiment. Embodiments are explained in detail below. These embodiments are for illustrative purposes only and are not to be interpreted as limiting. Features of different embodiments can be combined with one another unless otherwise stated. Variations, modifications, and details described for one of the embodiments are also applicable to other embodiments and are therefore not explained repeatedly.

[0038] Figure 1 shows a schematic diagram of an apparatus 10 for producing holograms according to an embodiment. The apparatus 10 serves to transfer a structure of a master hologram 12 into a copy carrier 13, which contains an initially unexposed, holographically suitable material. For this purpose, the copy carrier 13 is arranged on the master hologram 12. The master hologram 12 is in turn arranged on an optically transparent carrier 11. Instead of the illustrated optically transparent carrier 11, an optically transparent cylindrical roller can also be used, as explained above. Other carrier shapes can also be used, for example, optical freeforms with a freely designed surface. In this case, radii of curvature are preferably greater than 75 cm, preferably greater than 1 m. Such carriers can have a size of over 1 m 2, for example, 2m x 1m. For such optical freeforms, the material used for the copy carrier is preferably a polymeric film material with a thickness of less than 250µm and a modulus of elasticity of less than 3000MPa, which can be adapted to the corresponding freeform.

[0039] To write the structure of the master hologram 12 into the copy carrier 13, the master hologram 12 and the copy carrier 13 are illuminated with light 16 from a coherent light source 15. This light corresponds in wavelength to the corresponding reconstruction wavelength of the master hologram 12. Multiple structures for different wavelengths can also be written through appropriate multiple exposures with light 16 of different wavelengths. Part of the light 16 enters the copy carrier 13 directly and serves as reference light. Another part of the light 16 is diffracted by the structures of the master hologram 12 and interferes with the reference light in the copy carrier 13. The resulting interference pattern corresponds to the structure of the master hologram 12 to be copied. This structure is thus exposed into the copy carrier 13, and the master hologram 12 is duplicated.After the copying process, the copy carrier 13 is then removed, and the next, still unexposed copy carrier can be processed. This copying process is known in itself and will therefore not be explained further. Undesired reflections can occur at the interfaces between the structure consisting of carrier 11, master hologram 12, and copy carrier 13 and the environment (e.g., air), which can cause additional interference that distorts the interference pattern created in the copy carrier 13. To at least significantly reduce this effect, the device 10 has black covers 14A, 14B, and 14C that cover corresponding surfaces. The black cover 14A is particularly important because the light 16 falls directly onto the interface between the copy carrier 13 and the environment, and thus, without the black cover 14A, strong reflections can occur here. The black covers 14B, 14C can prevent further reflections.

[0040] As will be explained in more detail below, the black covers 14A, 14B, 14C, collectively referred to as black cover 14, comprise at least one light-absorbing material in the form of soot particles and a carrier material for the light-absorbing material. The carrier material has approximately the same refractive index as the component it covers at the respective interface. For example, the carrier material of the black cover 14A has approximately the same refractive index as the copy carrier 13 at the interface. Approximately the same refractive index means that the refractive index difference is less than 0.2, preferably less than 0.02, and particularly preferably less than 0.01. Such small refractive index differences can largely prevent reflections.

[0041] The reflection R results from the Fresnel equation for perpendicular light incidence as:

[0042] Where n1 and n2 are the refractive indices of the materials at the interface. For example, if the refractive index of the copy carrier at the interface is 1.48 (e.g., triacetate film) and the carrier material of the black cover at the interface is 1.51 (e.g., an acrylate), this results in a refractive index difference of 0.03 and a reflection R of approximately 0.01%. Depending on the design of the black cover, the total reflectance of the black cover can result from the absorption of the soot particles used, or their remaining reflectance, as well as the reflection at the interface. For example, using Orion Special Black 4 Powder as soot particles with a Blackness Value of 244 (according to DIN 55979), the total reflection of the black cover can be reduced to 0.055%. Subtracting the Fresnel reflection of 0.01% as an example value, this results in a purely formal reflectivity for the black pigment used itself of approximately 0.045% in the carrier material.The soot particles preferably have small particle sizes of less than 500 nm, preferably less than 250 nm, particularly preferably less than 100 nm, in particular less than 20 nm. The size here refers to the longest diameter (e.g. in the longitudinal direction in the case of a rod-shaped structure). The particles preferably have rod-shaped structures, thread-like structures, thread-like coiled structures, thread-like coiled and branched structures, or mixed structures thereof. Such particles with a comparatively complex structure generally have lower reflectance than compact particles with a simple spherical, cylindrical, cubic, or platelet geometry. The latter particles with a simple geometry are collectively referred to as structure-reduced. Preference is given to using non-structure-reduced particles. The particles preferably have a BET (NSA) surface area according to ASTM D 6556 of greater than 200 m. 2 / g. In general, particles with reduced structure exhibit higher reflectance, while particles with a pronounced fine structure (larger BET surface areas) exhibit lower reflectance, even if the latter are sometimes more difficult to incorporate into a carrier material, which is why a compromise between reflectance and processability must be chosen in some embodiments.

[0043] Examples of suitable carbon blacks are carbon black - Orion Engineered Carbons, gas black, furnace black, acetylene black, thermal black, or flame black. The density of the soot particles is so high that in a wavelength range of at least the light 16 used, preferably in a wavelength range of 400-800 nm, they have a reflectance of less than 0.1%, so that less than 0.1% of the light incident on the interface is reflected.

[0044] In particular, combinations of copy carrier 13 and black cover 14 are provided in exemplary embodiments. Such a combination is also referred to in this application as a copy carrier arrangement. Corresponding embodiment examples will now be explained.

[0045] Figure 2 shows a general diagram of a copy carrier assembly according to one embodiment. The copy carrier assembly of Figure 2 includes the previously discussed copy carrier 13 and a black cover 20 arranged on the copy carrier 13. While the black cover 20 in Figure 2 is arranged on only one side of the copy carrier 13, in other embodiments it can also be arranged on more than one side, for example, two sides of the copy carrier 13 lying at an angle. Various configurations of the copy carrier 13 and the black cover 20 will now be explained with reference to Figures 3A to 3C and 4.

[0046] In the embodiment of Figure 3A, the copy carrier 13 is formed by a photopolymer 31 arranged on a carrier film 30. The photopolymer 31 forms the aforementioned initially unexposed, light-sensitive layer into which the structure of the master hologram is written. The carrier film 30 serves as a carrier for the photopolymer 31. Materials conventionally used in hologram production can be used for the carrier film 30 and the photopolymer 31.

[0047] In this case, the black cover 20 is arranged on the photopolymer 31. The black cover 20 has the described soot particles embedded in a matrix. An example is shown in Figure 4.

[0048] Figure 4 shows schematically soot particles 42 which are embedded in a matrix 41, i.e. surrounding material, in order to form a black cover 40. The black cover 40 is an example of the black cover 20 in Figure 3A. The density of the particles 41 is only shown very schematically in Figure 4 and is considerably higher in actual embodiments in order to achieve the desired absorption properties. Common thermoplastic materials, in particular those processed as films, can be used as material for the matrix 41. Examples of these are polyethylene, polypropylene, Kapton, polycarbonate, polyvinyl chloride, polyethylene terephthalate, ethylene-vinyl acetate copolymers, cycloolefin copolymers, polystyrene, polyvinyl alcohols, polyvinyl acetate, polytetrafluoroethylene, polyamide, cellulose esters, polyurethanes and combinations thereof as coextrudates. Refractive indices of the above materials are typically in the range of 1.46-1.6.By selecting an appropriate combination, the refractive index can be selected within this range. In the case of Figure 3A, the refractive index of the matrix of the black cover 20 (for example, matrix 41 of Figure 4) is adapted to the refractive index of the photopolymer 31 such that a refractive index jump at an interface 32 fulfills the above condition, i.e., is less than 0.2, preferably less than 0.02, in particular less than 0.01.

[0049] In a preferred embodiment, to incorporate the soot particles 42 into the matrix 41, the soot particles can first be dispersed in low-viscosity additives or solvents that provide good wetting of the soot particles. This dispersion, also referred to as a slurry, is then incorporated into the matrix material after degassing under vacuum. In this way, the risk of air inclusions, which can lead to additional reflections, can be reduced, and agglomeration of soot particles into larger particles can at least be reduced.

[0050] Figure 3B shows a modification of Figure 3A, in which the copy carrier, in addition to the carrier film 30 and the photopolymer 31, also has a cover film 33 on the photopolymer 31. The cover film 33 can also be formed from the above-mentioned thermoplastic materials that can be processed as a film. In this case, the matrix of the black cover 20 has a refractive index that is adapted to the refractive index of the cover film 33, which in this case represents the layer of the copy carrier adjacent to the black cover 20. In this case, too, only a slight refractive index jump occurs at the interface 32, corresponding to low reflection.

[0051] In the embodiments of Figures 3A and 3B, the black cover 20 is directly and firmly connected to the copy carrier. In some embodiments, the cover film 33 (together with the black cover 20) can be detachable from the photopolymer. In other embodiments, the black cover can be attached to the copy carrier by means of an adhesive film. This can be designed as a detachable connection in order to easily remove the black cover from the then-exposed copy carrier after exposure. Such detachment is necessary if a transparent hologram is ultimately to be produced by exposing the photopolymer 31.

[0052] A corresponding embodiment is shown in Figure 3C. This is based on the embodiment of Figure 3B and has the same copy carrier consisting of carrier film, photopolymer and cover film as the embodiment of Figure 3B. As a black cover, the embodiment of Figure 3C has a combination of an adhesive film 34 and a black carrier film 35. The black carrier film 35 can be formed as explained with reference to Figure 4. If a detachable connection is desired, the adhesive film 34 preferably has an adhesive force of less than 60 cN / cm (centinewtons per centimeter), preferably less than 20 cN / cm, particularly preferably less than 10 cN / cm. With such a low adhesive force, the black cover can be easily removed. In such a structure, the materials are selected so that even a difference in refractive index at the interface between the adhesive film 34 and the black carrier film 35 (e.g.between a material of the adhesion film 34 and a matrix material of the black carrier film 35) is close to zero, i.e. less than 0.2, preferably less than 0.02 and particularly preferably less than 0.01, in order to suppress reflections at this interface. The adhesion film 34 is formed from an optically transparent material. It has low absorption, i.e. it is crystal clear, so that no additional scattering is caused by the adhesion film 34. In this case, the adhesion film 34 is arranged at the interface 33 and its refractive index is matched to the correspondingly adjacent layer of the copy carrier, in this case the covering film 33. A corresponding black cover as a combination of adhesion film 34 and black carrier film 35 can also be used for the copy carrier of Figure 3A. In this case, the refractive index of the adhesion film 34 is matched to the refractive index of the photopolymer 32.

[0053] Possible materials for the adhesive film 34 include silicones, urethanes, acrylates, or epoxies. In particular, the following materials can be used:

[0054] Pure acrylates e.g. 2-ethylhexyl acrylate, isooctyl acrylate, butyl acrylate, methyl acrylate, vinyl acetate (solvent-based for black covers firmly bonded to the copy carrier)

[0055] Modified acrylates (aqueous dispersions for residue-free removable black covers) Elastomers such as styrene, isoprene, thermoplastic elastomers - SIS; styrene, ethylene butylene, styrene - SEBS (hot melt adhesives for permanently bonded black covers)

[0056] Natural rubber (radiation-crosslinked or hot-melt adhesive, depending on the modification for permanently bonded or residue-free removable black covers) Polyurethane (radiation-crosslinked, depending on the modification for permanently bonded or residue-free removable black covers)

[0057] Silicones (2-component systems or radiation-curing, depending on the modification for residue-free removable or permanently bonded black covers) Epoxy systems (2-component systems or radiation-curing, depending on the modification for residue-free removable or permanently bonded black covers)

[0058] In addition to covering an interface such as interface 32 of the copy carrier, the described black covers can also be used to cover additional surfaces, as shown for the device in Figure 1 for the black covers 14A, 14B, and 14C. The reflectance achieved by the black cover can be measured as follows. A high-resolution UV-VIS-NIR spectrometer with an add-on module suitable for reflectance measurements is used as the measuring device. An example is the JASCO V-770 +ARMN-920 device. For the measurement, the measuring device first measures a highly reflective reference sample (back reflection almost 100%). This measurement provides the 100% baseline.

[0059] The measuring device then measures a light trap (0.0000% back reflection) as an additional reference sample. This measurement provides the 0% baseline (also called dark measurement).

[0060] Next, the measuring device measures an unblackened sample of the material whose interface is to be blackened—for example, the copy substrate without the black cover. This measurement provides the reference basis for assessing the desired blackening. The measurement includes a back reflection, which (for transparent media, such as those required for copy substrates) consists of equal parts of the Fresnel reflection of the first (front) and the Fresnel reflection of the second (back) interface of the copy substrate.

[0061] The measuring device receives the blackened sample, with the light falling on the first interface, creating a Fresnel reflection (e.g., approximately 4%). If the actually observed reflection value is greater than a threshold value, e.g., 4.1%, the blackening is insufficient (0.1% additional reflection from the area covered with the black cover at 4% reflection at the front interface). In exemplary embodiments, a reflection level of less than 0.05%, preferably less than 0.01%, is achieved.

[0062] Such copy carriers with black covers can then be used to produce holograms using the device 10 of Figure 1. Figure 5 shows a flowchart of a corresponding method for producing a hologram according to an exemplary embodiment. The method of Figure 5 will be explained with reference to the above description of the device 10 of Figure 1 as well as the description of copy carrier arrangements with reference to Figures 2-4.

[0063] In step 50 of Figure 5, a copy carrier is arranged on a master hologram, as shown in Figure 1 for the copy carrier 13 and the master hologram 12.

[0064] In step 51, a black cover having the properties explained above is then provided on at least one interface of the copy carrier. The black cover can also be provided on other interfaces, as shown for the black covers 14A, 14B, and 14C in Figure 1. Steps 51 and 50 do not have to be performed in the order shown. For example, the black cover can first be applied to an interface of the copy carrier, and then the copy carrier with the black cover can be arranged on the master hologram.

[0065] In step 52, exposure then takes place as shown in Figure 1 for the light 16, whereby the structure of the master hologram is transferred into the copy carrier.

[0066] Then the process of Figure 5 can be repeated with a new copy carrier.

[0067] As already mentioned, the above embodiments are for illustrative purposes only and are not to be interpreted as limiting.

Claims

Patent claims 1. Copy carrier arrangement comprising: a copy carrier (13) comprising a photosensitive material (31), and a black cover (14A-C; 20) arranged on at least one side of the copy carrier (13) comprising light-absorbing carbon black particles (42) and carrier material (34; 41), wherein a refractive index difference between the copy carrier (13) and the carrier material (34; 41) at an interface (32) between the black cover (14A-C; 20) and the copy carrier (13) is less than 0.

2.

2. Copy carrier arrangement according to claim 1, wherein the soot particles have a size smaller than 500nm.

3. Copy carrier arrangement according to claim 1 or 2, wherein the carbon black particles have a BET surface area according to ASTM D 6556 of greater than 200 m². 2 exhibit / g.

4. Copy carrier arrangement according to one of claims 1 to 3, wherein the carrier material (34; 41) comprises a matrix (41) in which the soot particles (42) are arranged.

5. Copy carrier arrangement according to claim 4, wherein the interface (32) is an area of ​​the matrix (41) facing the copy carrier (13).

6. Copy carrier arrangement according to one of claims 1 to 4, wherein the carrier material (34; 41) comprises an adhesion film (34), wherein the interface (32) is a surface of the adhesion film (34) facing the copy carrier (13).

7. Copy carrier arrangement according to claim 6, wherein the adhesive force of the adhesion film (34) is less than 60 cN / cm.

8. Copy carrier arrangement according to claim 4 and according to one of claims 6 or 7, wherein a refractive index difference between the matrix (41) and the adhesion film (34) is less than 0.

2.

9. Copy carrier arrangement comprising: a copying substrate (13) comprising a photosensitive material (31) and a black cover (14A-C; 20) arranged on at least one side of the copying substrate (13) comprising light-absorbing graphene particles and / or nanotubes and support material (34; 41), wherein a refractive index difference between the copying substrate (13) and the support material (34; 41) at an interface (32) between the black cover (14A-C; 20) and the copying substrate (13) is less than 0.

2.

10. Copy carrier arrangement according to claim 9, wherein the carrier material (34; 41) comprises a matrix (41) in which the graphene particles and / or nanotubes are arranged.

11. Copy carrier arrangement according to claim 10, wherein the interface (32) is an area of ​​the matrix (41) facing the copy carrier (13).

12. Copy carrier arrangement according to one of claims 8 to 11, wherein the carrier material (34; 41) comprises an adhesion film (34), wherein the interface (32) is a surface of the adhesion film (34) facing the copy carrier (13).

13. Copy carrier arrangement according to claim 12, wherein the adhesive force of the adhesion film (34) is less than 60 cN / cm.

14. Copy carrier arrangement according to claim 10 and according to one of claims 12 or 13, wherein a refractive index difference between the matrix (41) and the adhesion film (34) is less than 0.

2.

15. Copy carrier arrangement according to one of claims 1 to 14, wherein the refractive index difference is less than 0.

02.

16. Copy carrier arrangement according to one of claims 1 to 15, wherein the reflectance of the black cover (14A-C; 20) is less than 0.05%.

17. Copy carrier arrangement according to one of claims 1 to 16, wherein the copy carrier (13) comprises a photopolymer (31) arranged on a carrier film (30).

18. Copy carrier arrangement according to claim 17, wherein the interface (32) is a surface of the photopolymer (31) facing the black cover (14A-C; 20).

19. Copy carrier arrangement according to claim 17, wherein the copy carrier has a cover film (33) on the photopolymer (31), wherein the interface (32) is a surface of the cover film (33) facing the black cover (14A-C; 20).

20. Device (10) for producing holograms, comprising: a master hologram (12), and a copy carrier arrangement arranged on the master hologram according to any one of claims 1 to 19.

21. Device (10) according to claim 20, wherein the black cover (14A-C; 20) covers a side of the copy carrier arrangement facing away from the master hologram (12) and at least one side surface of the copy carrier arrangement and the master hologram (12).

22. Method for producing a hologram, comprising: arranging a copy carrier (13) on a master hologram (12), Arranging a black cover (14A-C; 20) at least on one surface of the copy carrier (13) to form a copy carrier arrangement according to one of claims 1 to 19, and exposing the copy carrier with an interference pattern generated by means of the master hologram (12).

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