Module for a device for the thermal treatment of workpieces

Abstract

The present disclosure relates to a module (1) for a device (100), a device for the thermal treatment of workpieces, and a suction device for suctioning particles and / or gases which are emitted or produced on a surface of the treated workpiece during the thermal treatment of a workpiece with the aid of a module or device according to the invention, wherein the module (1) comprises: a thermally conductive base block (2), at least one electric input (6) and output (7), an LED lighting surface (11), wherein the LED lighting surface (11) is formed by at least one LED module (10) which is arranged on a base block side (3) and is electrically conductively connected to the electric input (6) and output (7), a module lighting surface (18) having a module power density (BPD) which corresponds to the sum of the power, emitted as light, of the LED modules arranged on the base block top side (3) per entire surface of the base block side (3), an electrically insulating and thermally conductive separating layer (12) between LED module (10) and base block side (3), wherein the module power density (BPD) is greater than 20 W / cm².

Description

[0001] Component for a device for the thermal treatment of workpieces

[0002] TECHNICAL FIELD

[0003] The present disclosure relates to a component for a device for the thermal treatment of workpieces, a device for the thermal treatment of workpieces having at least one said component, and a suction device for suctioning off particles and / or gases which escape or are produced during thermal treatment of a workpiece.

[0004] BACKGROUND

[0005] Thermal treatment of workpieces is part of a wide variety of different manufacturing and processing processes. These include, for example, the sintering of ceramics, the melting or heat treatment of metals or ores, the firing of cement or cement precursors, the treatment of mineral granules, and many more.

[0006] For the purposes of the present invention, the term "workpiece" encompasses all largely solid materials to be treated. These can be in the form of larger, coherent units, such as green compacts, blanks, or semi-finished products. Non-coherent units, such as powder, green powder, or other precursors, are also included under the term "workpiece."

[0007] For the purposes of the present invention, thermal treatment of a workpiece is understood to mean all types of treatment in which the workpiece is at least partially heated. Examples include sintering processes, surface treatments, melting processes, the firing of coatings on a surface, and the drying of surfaces, in particular the drying of paints and varnishes on surfaces.

[0008] The thermal treatment of workpieces is basically possible through a variety of heating processes, such as electrical heating, heating by means of exothermic reactions, in particular the combustion of gases, or the absorption of radiation.

[0009] Energy consumption is a particularly relevant factor for the efficient design of heating processes. Heating workpieces by absorbing radiation is particularly advantageous in terms of efficiency. On the other hand, the devices required for this, such as laser systems, are more expensive to purchase and maintain than, for example, simple gas burners.

[0010] In addition to their energy consumption, gas burners have the disadvantage that they can only be controlled selectively and precisely to a limited extent.

[0011] Various devices and methods for generating and using radiation for the thermal treatment of workpieces are known from the prior art. However, these devices and methods have the aforementioned individual disadvantages, as well as limitations in flexibility, process speed, and energy efficiency. SUMMARY OF THE DISCLOSURE

[0012] It is therefore the object of the present invention to provide an efficient and powerful device for the thermal treatment of workpieces.

[0013] This object is achieved according to the invention by a module for a device for the thermal treatment of workpieces according to claim 1 and by a device for the thermal treatment of workpieces with said modules according to claim 24.

[0014] According to the invention, the module for a device for the thermal treatment of workpieces has the following features:

[0015] - a thermally conductive base block with a base block side,

[0016] - at least one electrical input,

[0017] - an LED luminous surface, wherein the LED luminous surface is formed by at least one LED module, wherein the at least one LED module is arranged on the base block side and is electrically connected to the electrical input,

[0018] - a building block luminous surface with a building block power density (BPD), where the building block power density (BPD) corresponds to the sum of the power emitted as light by the LED modules arranged on the basic block side per total area of ​​the basic block side,

[0019] - a separating layer between the LED module and the base block side, wherein the separating layer is electrically insulating and thermally conductive, wherein the component further comprises at least one electrical output to which the at least one LED module is electrically conductively connected, the separating layer is electrically insulating and the component power density (BPD) is greater than 20 W / cm 2 The thermally conductive base block's geometry is not limited to rectangular blocks. For example, the base block can have the basic shape of a triangle, hexagon, or other polygon with a base block thickness of d. The base material of the base block is preferably copper, as this is a particularly good thermal conductor.

[0020] The at least one electrical input and output can be provided in the form of simple contacts or plugs.

[0021] An LED module preferably has an electrical contacting option, a socket, and an LED chip. An LED module can have multiple sockets and LED chips.

[0022] The size of an LED module can also be matched to the size of the base block, so that it precisely covers the area of ​​the base block side, reducing the number of components and thus complexity and manufacturing costs. In a particularly advantageous design, the separation layer and LED luminous surface are manufactured directly on the base block.

[0023] The LED luminous area is formed by the area of ​​all the LED chips located in the LED modules arranged on the base block side. The LED luminous area is thus the sum of those areas on the module that actually emit light. The emitted light is in the wavelength range of 100 to 1000 nm, preferably 200 to 600 nm.

[0024] The module's luminous area describes the entire surface of a module, formed by the base block side. Non-light-emitting spaces between the LED modules or LED chips also contribute to this.

[0025] The device power density (BPD) describes the energy emitted as light

[0026] Power per area of ​​the base block side. The base block side of the component includes light-emitting surfaces, the surfaces of the LED chips, and non-light-emitting surfaces, such as gaps and edges.

[0027] The separating layer is preferably formed from aluminum nitride. The key is to select a material with both electrical insulation and good thermal conductivity. The separating layer does not need to be applied over the entire surface of the base block. For example, the separating layer can be applied only in areas where an LED module is located.

[0028] The thickness of the separating layer is preferably less than 500 pm, more preferably less than 425 pm, more preferably less than 350 pm, more preferably less than 275 pm, more preferably less than 200 pm, more preferably less than 100 pm, more preferably less than 40 pm, more preferably less than 10 pm, more preferably less than 2 pm. Such smaller thicknesses can optimize the dissipation of heat from the LED modules.

[0029] In a particularly preferred embodiment, the separation layer has a thickness of (about) 375 pm, which can be an optimized compromise between heat dissipation and stability.

[0030] For the purposes of the present invention, the term "workpiece" encompasses all largely solid materials to be treated. These can be in the form of larger, coherent units, such as green compacts, blanks, or semi-finished products. Non-coherent units, such as powder, green powder, or other precursors, are also included under the term "workpiece."

[0031] A device power density (BPD) greater than 20 W / cm 2 has proven to be particularly advantageous because, with the appropriate component power density (BPD), a large number of materials can already be thermally treated.

[0032] A device power density (BPD) of, for example, 20 W / cm 2This already allows for sufficient energy input into the surface of some thermally treated workpieces. For example, it is possible to heat a highly absorbent workpiece to temperatures of 1100 °C.

[0033] Fundamentally, there is a relationship between the component power density (BPD) and the achievable temperature of a workpiece to be thermally treated. This relationship is not necessarily linear across temperature, as different factors determine the temperature reached in different temperature ranges. Particularly in high temperature ranges, the temperature reached can depend on the power density in the form of the fourth root.

[0034] A further increase in the device power density (BPD) is advantageous because with increasing device power density (BPD) further thermal treatment options become possible, such as thermal treatment at even higher temperatures.

[0035] The component according to the invention has the advantage of creating a cost-effective and robust alternative to lasers or other optical systems, while simultaneously achieving high levels of performance. The use of LEDs enables particularly energy-efficient and thus cost-effective light generation. LEDs are also cheaper to purchase than, for example, laser systems. Furthermore, the component power density (BPD) can be precisely and easily controlled via the power supply, which represents an advantage over, for example, gas burners. The preferably flat basic geometry of the component further enables scalability of the component, so that even larger workpiece surfaces can be thermally treated.

[0036] Furthermore, due to the possible component power densities (BPD), no additional focusing of the light is required, which makes it possible, for example, to dispense with complex optics.

[0037] Furthermore, the device according to the invention enables a homogeneous thermal treatment of workpieces in a surprisingly simple manner.

[0038] The object described above is also achieved by a device according to the invention for the thermal treatment of workpieces, wherein the device has at least one component according to the invention.

[0039] The device can be formed by a single component, but it is advantageous to use multiple components. This allows for easy implementation of the scalability mentioned.

[0040] Due to the high power densities of over 20 W / cm 2A large amount of heat can be generated, which must be dissipated away from the LED modules to prevent damage. The thermally conductive separator layer conducts the heat to the thermally conductive base block. The thermally conductive base block, in turn, conducts the heat away from the LED modules.

[0041] In one aspect of the invention, the component according to the invention comprises a cooling device designed to bring the base block into thermal contact with a coolant. If the thermally conductive base block cannot dissipate sufficient heat from the LED modules due to the ambient environment, it can be cooled by the cooling device, thereby increasing the maximum dissipable heat.

[0042] In a preferred aspect of the invention, the cooling device comprises at least one coolant inlet and at least one coolant outlet. This allows a flow of coolant into and out of the cooling device. This enables a continuous exchange of the coolant, further increasing the dissipated heat.

[0043] In a particularly preferred aspect of the invention, the cooling device is designed to feed a coolant into the base block via the at least one coolant inlet and to discharge it from the base block via the at least one coolant outlet. The cooling device and thus the coolant inlets and outlets can be part of the base block. This ensures direct contact between the coolant and the base block, which further increases the amount of heat that can be dissipated.

[0044] The at least one coolant inlet and outlet can be provided in the form of hose connectors or hose couplings. The coolant is preferably water.

[0045] According to a further embodiment of the module, the LED luminous area covers at least 60%, preferably at least 70%, more preferably at least 80%, more preferably at least 90% of the base block side.

[0046] According to one embodiment of the component, the LED luminous area has a luminous area power density (LPD). The luminous area power density (LPD) describes the power emitted as light per LED luminous area, for example, per cm 2LED luminous area. The larger the area of ​​the base block side covered by LED luminous area, the more homogeneous the light irradiation on a workpiece arranged at a given working distance. Furthermore, with a larger coverage, lower luminous area power density (LPD) is required to achieve a given component power density (BPD).

[0047] According to a further embodiment of the component, several LED modules form the luminous surface and the LED modules are configured to emit different wavelength ranges.

[0048] The maximum achievable luminous area power density (LPD) and thus also the component power density (BPD) are limited by the available LEDs. The maximum power of LEDs is essentially wavelength-dependent. For the present invention, the maximum available LED power densities of the respective wavelength are particularly advantageous.

[0049] The workpieces to be thermally treated absorb light of different wavelengths to varying degrees, with the absorption also depending on the temperature, particularly the surface temperature of the workpiece. The advantage of this design is that light of different wavelengths can be used for the thermal treatment of the workpieces, depending on the surface temperature of the workpiece to be treated.

[0050] By selecting different wavelength ranges, a wavelength range optimized for a workpiece to be thermally treated can be selected.

[0051] In a continuation of the aforementioned embodiment, a first wavelength range is in the range 425 to 600 nm and a second wavelength range is in the range 200 to 425 nm. LEDs emitting in the first wavelength range are readily and inexpensively available commercially, in particular 440 or 455 nm.

[0052] In the second wavelength range, LEDs that emit, for example, in the wavelength range 405, 395, 385, 375 or 365 are preferably used, as these are also easily and inexpensively available.

[0053] According to a further embodiment of the component, several LED modules form the luminous surface and there are several electrical inputs and outputs, each of which is electrically connected to an LED module or a group of LED modules.

[0054] An LED module group is formed by a combination of individual LED modules, for example LED modules located in a row or in an area.

[0055] This design has the advantage that individual LED modules or groups of LED modules can be electrically controlled. This allows, for example, the intensity of the light emitted by the module to be spatially varied.

[0056] In the case that the LED modules also emit light in different wavelength ranges, it is thus possible, for example, to first irradiate light in the first or second wavelength ranges onto a workpiece surface to heat the workpiece surface until a predetermined surface temperature is reached, and then to irradiate light in the second or first wavelength ranges. Simultaneous irradiation of light in different wavelength ranges is also possible, for example.

[0057] This also improves the versatility and usability of the components. According to a further embodiment of the component, the base block has one or more channels, preferably a lamellar structure, through which a coolant, preferably a cooling fluid, can flow via the coolant inlet and coolant outlet. The channels can form a structure arranged inside the base block, which ensures good heat exchange between the base block and the cooling medium.

[0058] A finned structure, or other channel shapes, increases the surface area over which heat can be transferred from the base block into the coolant. This increases the potential cooling performance. A finned structure is particularly effective in this regard.

[0059] According to a further embodiment of the module, the distance between the base block side and a coolant that can be introduced via the coolant inlet is less than 1 cm.

[0060] This enables fast and efficient heat dissipation. Especially when using LEDs with high power density (LPD), the thermal power generated as a byproduct can be transferred into the coolant via the base block material. For example, at spacings of more than 1 cm, the thermal conductivity of the base block material may not be high enough, limiting the heat dissipation potential. This can cause the individual LEDs to overheat. In extreme cases, this can damage the structural integrity of the component. Spacings of less than 1 cm prevent this.

[0061] According to some embodiments, the base block side can be a base block top side. In further preferred embodiments, the base block top side is the side of the base block facing the workpiece. In further preferred embodiments, the base block further comprises a base block bottom side and base block side surfaces, wherein the base block bottom side can be opposite or diagonally opposite the base block top side.

[0062] According to one embodiment of the module, connection options are provided on the underside of the basic block.

[0063] The connection options can be provided, for example, in the form of mechanical connections such as threaded holes, eyelets, or snap-in connections and / or in the form of positive connection options such as gluing, welding, or soldering. This enables the module to be attached to a bracket, for example.

[0064] According to a further embodiment of the module, the electrical input and / or electrical output and / or the coolant inlet and / or the coolant outlet are arranged on the base block underside.

[0065] This enables particularly easy contacting from the underside of the base block.

[0066] According to a further embodiment of the module, the electrical input and / or electrical output and / or the coolant inlet and / or the coolant outlet are arranged on a base block side surface.

[0067] This enables a particularly simple way of plugging and interconnecting several modules to form a device according to the invention comprising several modules. According to one embodiment of the device, the device is formed and / or expandable in a modular manner by juxtaposed modules.

[0068] This enables the scalability described above. Depending on the workpiece to be thermally treated, the fixture can be quickly and easily adapted and, for example, enlarged.

[0069] According to a further development of this embodiment, an electrical input and / or coolant inlet of a subsequent module is connected to an electrical output and / or coolant outlet of a previous module.

[0070] This is possible in a particularly simple manner if the electrical input and / or output and / or the coolant inlet and / or the coolant outlet of a module is arranged on a base block side surface of the respective module.

[0071] Advantageously, several electrical inputs and / or outputs and / or coolant inlets and / or coolant outlets are provided on different base block side surfaces, so that even flat structures can be plugged together to form a device using the building blocks.

[0072] In one aspect of the invention, each of the one or more LED modules is covered by a first transparent component. In a preferred aspect of the invention, each first transparent component covers exactly one LED module. This protects the sensitive LED modules from physical impact that could lead to damage. Contact with the LED modules can cause damage, particularly when installing and removing the module. In one aspect of the invention, the one or more first transparent components are made of glass. In a particularly preferred aspect of the invention, the one or more first transparent components are made of quartz glass. In a further aspect of the invention, the one or more first transparent components are made of sapphire crystal.

[0073] The one or more first transparent components can be permanently installed with the LED modules covered by them.

[0074] According to a further embodiment of the component, the LED luminous surface is covered by a second transparent component on the side of the LED module(s) facing away from the base block (top). According to a preferred embodiment, the one or more first transparent components are covered by the second transparent component on the side of the one or more first transparent components, which protect the LED modules from physical impact, facing away from the base block (top).

[0075] The second transparent component is designed to protect the components of the module located between the thermally conductive base block and the second transparent component from gases and / or particles that escape or form on the surface of the thermally treated workpiece. The second transparent component is replaceable, thus preventing the need to replace the LED modules themselves.

[0076] In one aspect of the invention, the second transparent component is made of glass. In a particularly preferred aspect of the invention, the second transparent component is made of quartz glass. In a further aspect of the invention, the second transparent component is made of sapphire crystal. This prevents damage and / or contamination of the LED module(s).

[0077] According to a further embodiment of the building block, the base block side has an area in the range of 1 to 100 cm 2 , preferably 5 to 25 cm 2 .

[0078] Such sizes have proven particularly advantageous because they are easy to handle. Furthermore, they represent a compromise between surface area and thus the size of the workpiece to be thermally treated, and electrical and cooling power consumption.

[0079] According to further preferred embodiments of the component, the component power density (BPD) is greater than 35 W / cm 2 , more preferably greater than 50 W / cm 2 , more preferably greater than 80 W / cm 2 , more preferably greater than 100 W / cm 2 , more preferably greater than 130 W / cm 2 , more preferably greater than 200 W / cm 2 . The BPD is preferably not greater than 1000 W / cm 2 , more preferably not greater than 600 W / cm 2 , more preferably not greater than 400 W / cm 2 , more preferably not greater than 300 W / cm 2 .

[0080] According to a preferred embodiment, the module for a device for the thermal treatment of workpieces has the following features:

[0081] - a thermally conductive base block with a base block top, a base block bottom and base block side surfaces,

[0082] - at least one electrical input and at least one electrical output,

[0083] - at least one coolant inlet and at least one coolant outlet,

[0084] - an LED luminous surface with a luminous surface power density (LPD), wherein the LED luminous surface is formed by at least one LED module, wherein the at least one LED module is arranged on the base block top side and is electrically connected to the electrical input and electrical output,

[0085] - a building block luminous surface with a building block power density (BPD), where the building block power density (BPD) corresponds to the sum of the power of the LED modules arranged on the top of the base block per total area of ​​the top of the base block and where the building block power density (BPD) is greater than 20 W / cm 2 , preferably greater than 35 W / cm 2 , more preferably greater than 50 W / cm 2 , more preferably greater than 80 W / cm 2, more preferably greater than 100 W / cm 2 , more preferably greater than 130 W / cm 2 , more preferably greater than 200 W / cm 2 amounts,

[0086] - a separating layer between the LED module and the top of the base block, whereby the separating layer is electrically insulating and thermally conductive.

[0087] According to one embodiment of the device, the module luminous surfaces of the modules form a device luminous surface with a device power density (VPD), wherein the device power density (VPD) corresponds to the sum of the power of the LED modules arranged on the base block sides of the modules per total area of ​​the device, wherein the device power density (VPD) is greater than 20 W / cm 2 , preferably greater than 35 W / cm 2 , more preferably greater than 50 W / cm 2 , more preferably greater than 80 W / cm 2 , more preferably greater than 100 W / cm 2 , more preferably greater than 130 W / cm 2, more preferably greater than 200 W / cm 2 amounts.

[0088] In a preferred aspect, the device power density (VPD) is not greater than 1000 W / cm 2 , more preferably not greater than 600 W / cm 2 , more preferably not greater than 400 W / cm 2 , more preferably not greater than 300 W / cm 2 .

[0089] The device luminous area is defined analogously to the component luminous area as the area which is the total area of ​​the device from which light is emitted, whereby the non-light emitting areas, such as spaces between LED modules, spaces between the components and edge areas, are also counted.

[0090] This enables thermal treatment of workpieces using the device analogous to the designs for component power density (BPD).

[0091] According to a further development of this embodiment, at a working distance of at least 1 cm, the variation of the device power density (VPD) is less than 20%, preferably less than 10%, more preferably less than 5%.

[0092] The variation is defined as the percentage deviation from the average value. This enables uniform thermal treatment of workpieces without the formation of local hot spots or excessively cold areas.

[0093] A correspondingly small variation is achieved, for example, by ensuring that the width of the non-luminous edge of the device amounts to at most 20%, preferably at most 10%, and more preferably at most 5% of the width of the device. Further preferably, the width of the non-light-emitting edge of the individual components is less than 1 mm, preferably less than 2 mm, and more preferably less than 3 mm.

[0094] In one embodiment of the module, the statements regarding variation also apply to the module.

[0095] In a further embodiment of the device, the device has a process chamber, wherein the at least one component is arranged within or on the process chamber.

[0096] When arranged on the process chamber, the at least one component is preferably arranged on the outside of a window to the process chamber, so that the light emitted by the at least one component radiates into the process chamber, preferably onto a sample table or sample holder in which a workpiece to be treated can be fixed.

[0097] In a process chamber, the ambient conditions can be adjusted to suit the material properties of the workpiece being treated. For example, the chamber can contain reduced air pressure, even a vacuum, or protective gases to protect the workpieces from oxidation.

[0098] A process chamber in which a reduced air pressure down to a vacuum can be generated also has a particularly advantageous effect on the efficiency when using light in the short wavelength range.

[0099] Alternatively, the atmosphere in the chamber can also contain process gases. The chamber can be designed as a closed chamber or open on one or more sides, for example, to allow for a continuous flow of workpieces to be treated.

[0100] The process chamber may contain a holder for workpieces.

[0101] A workpiece holder can be designed in a variety of ways. For example, it can be an insulating base on which the workpieces are positioned, or it can be a mechanism that allows for the illumination of falling powder. Preferably, the external environment of the device is shielded by the process chamber from the LED light emitted within it.

[0102] In a further embodiment of the device, the device has mirrors in the outer edge regions of the surface formed from the building blocks, which mirrors are designed to reflect light emitted laterally from the building block luminous surfaces, preferably in the direction of a workpiece to be treated. At the outer edge regions of the surface formed by the building blocks, the power density of the LED light can decrease outwards and tend towards zero the further one moves away from the surface formed by the building blocks. As a result, in some cases the entire formed surface cannot be used for processing. By appropriately arranging and aligning the mirrors in the outer edge regions of the surface formed from the building blocks, the area usable for processing can be increased.

[0103] During thermal treatment, the workpieces are heated to very high temperatures, for example, 1100°C, by components according to the invention. The inventors have recognized that this can typically lead to evaporation from the treated workpiece or reactions on the surface of the treated workpiece. The inventors have also recognized that the resulting or escaping particles and / or gases can damage sensitive components due to the high temperatures, for example, by burning in. The described particles and / or gases that arise during the heating of workpieces can lead to damage to the LED modules of the component according to the invention. If particles and / or gases from the workpieces burn into the LED modules, the performance of the component is impaired.In addition, the power density across the component is reduced and uneven, meaning that workpieces can no longer be thermally treated sufficiently and evenly. Consequently, LED modules must then be replaced.

[0104] It is therefore a further object of the invention to increase the service life of the components for the thermal treatment of workpieces while maintaining unchanged effectiveness.

[0105] This object is achieved by an extraction device according to the invention. The extraction device according to the invention for extracting particles and / or gases that escape or arise on a surface of the treated workpiece during thermal treatment using a component according to the invention or an apparatus according to the invention comprises a turbomachine, one or more lines, and a suction nozzle. The lines couple the turbomachine to the suction nozzle, which is designed such that, in conjunction with the turbomachine, it is suitable for generating a (primarily) laminar flow outside the extraction device and in the vicinity of the suction nozzle.

[0106] The (essentially) laminar flow thus generated removes the particles and / or gases through the extraction device before they can reach the LED luminous surfaces of the LED modules, thereby increasing the service life of the component.

[0107] This extension of service life is achieved without reducing the effectiveness of the thermal treatment.

[0108] On the one hand, the installation of a transparent component, such as quartz glass, can be omitted, which reduces optical losses on the path between LED modules and the workpiece.

[0109] On the other hand, convection is reduced. If a flow is generated in the environment of the workpiece to be treated, heat can be released from the workpiece to the environment more intensively by convection, so that a higher power density of the module is required to achieve the same temperature in the workpiece. The extraction device according to the invention reduces this effect of convection by generating a (primarily) laminar flow, i.e. less turbulence occurs which would result in convection of heat away from the workpiece to be treated. The extraction device according to the invention thus allows the modules according to the invention to be protected from particles and / or gases that escape or are created without significantly reducing their effectiveness, thus ensuring the longevity and effectiveness of the modules.

[0110] In one aspect of the invention, the turbomachine is a fan. Other turbomachines can also be used, such as blowers and compressors.

[0111] The flow machine is coupled to the suction nozzle through the pipes, so that a pressure difference is created at the inlet of the suction nozzle between the interior of the suction nozzle and the external environment of the suction nozzle.

[0112] The suction nozzle is designed in such a way that, in conjunction with the one or more lines and the turbomachine, a laminar flow of the fluid is caused in the vicinity of the suction nozzle.

[0113] The design of the suction nozzle may depend on the turbomachine and the coupling or connection between the suction nozzle and the turbomachine.

[0114] Laminar flows are characterized by the fact that they contain essentially no turbulence or swirls. If a laminar flow occurs in an area between two objects, it is therefore essentially guaranteed that the environment of each object remains undisturbed by the flow. However, the flow forms a threshold for gases and / or particles that arise on or in one object and move along trajectories towards the other object, since these are picked up in the flow on the trajectory from one object to the other and carried away along the flow. In a preferred aspect of the invention, the extraction device, the one or more modules according to the invention and the workpiece to be treated are arranged such that the (preferably) laminar flow occurs between the LED luminous surfaces of the one or more modules and the workpiece to be treated.

[0115] In a particularly preferred aspect, the (essentially) laminar flow is directed obliquely to a plane perpendicular to at least one of the one or more LED luminous surfaces of the one or more components. This ensures that particles and / or gases that form or escape from a surface of the workpiece and whose trajectory leads toward the LED luminous surfaces are intercepted by the flow and carried away by the LED luminous surfaces. Since essentially no turbulence occurs, convection occurs only to a very small extent, so that essentially no heat flows away from the workpiece.

[0116] In a further particularly preferred aspect, an intersection point of the (predominantly) laminar flow with the plane perpendicular to at least one of the one or more LED luminous surfaces of the one or more building blocks lies in the light field of the LED luminous surfaces of the one or more building blocks. This ensures effective protection of the LED luminous surfaces. The (predominantly) laminar flow is generally not one-dimensional. There is therefore more than one intersection point of the flow with the designated plane. It is sufficient if at least one intersection point lies in the light field of the LED luminous surfaces of the one or more building blocks. The light field is the set of spatial points through which the light emitted by the one or more LED luminous surfaces of the one or more building blocks passes.The extraction device can also contain filters which are suitable for filtering out extracted gases and / or particles so that they do not, for example, reach the turbo machine and damage it or escape from the extraction device again.

[0117] The suction device can also be used in conjunction with multiple modules or a device according to the invention comprising one or more modules. In particular, a suction device can also be used with an embodiment of the device that includes a process chamber.

[0118] In a further aspect of the invention, the suction device can also comprise a blowing device. The blowing device can be arranged such that it causes a flow of a fluid toward the suction nozzle. This increases the suction area of ​​the suction device. For example, when using a device according to the invention consisting of several components according to the invention, a large LED lighting area may need to be protected. The described embodiment is particularly suitable for meeting this requirement. In a preferred aspect of the invention, the blowing device causes a substantially laminar flow directed toward the suction nozzle.

[0119] In a further aspect of the invention, several suction devices can be used together.

[0120] BRIEF DESCRIPTION OF THE DRAWINGS

[0121] The invention is explained in more detail below with reference to the accompanying drawings. They show:

[0122] Fig. 1 a shows an embodiment of a module for a device for the thermal treatment of workpieces with a cooling device. Fig. 1 b shows an embodiment of a module for a device for the thermal treatment of workpieces.

[0123] Fig. 2 is a further view of the embodiment of Fig. 1 b;

[0124] Fig. 3 shows a further embodiment of a module for a device for the thermal treatment of workpieces;

[0125] Fig. 4 is a further view of the embodiment of Fig. 3;

[0126] Fig. 5 shows an embodiment of a device for the thermal treatment of workpieces with building blocks;

[0127] Fig. 6 shows an embodiment of a base body of a module for a device for the thermal treatment of workpieces;

[0128] Fig. 7 shows an embodiment of a device for the thermal treatment of workpieces comprising a process chamber and components.

[0129] Fig. 8 shows an embodiment of the system comprising a module for the thermal treatment of a workpiece, a workpiece to be treated and a suction device

[0130] Fig. 9 a front view of an embodiment of a suction nozzle for a suction device

[0131] Fig.10 a) a side view and b) a parallel cross section of a suction nozzle for a suction device. Components which are shown in several figures have the same reference symbols.

[0132] DETAILED DESCRIPTION

[0133] Figure 1a describes a first embodiment of a module 1 for a device for the thermal treatment of workpieces. The module 1 has a base block 2, which consists of a thermally conductive material, for example copper. One or more LED modules 10 are arranged on a base block side 3. The embodiment shown as an example in Figure 1a comprises 45 LED modules. The LED modules 10 preferably have an electrical contacting option, a socket, and at least one LED chip. An LED module 10 can have multiple sockets and LED chips. The actual light-emitting area of ​​an LED module 10 is formed by the sum of the areas of the respective LED chips of the LED module 10.

[0134] The module 1 has a module luminous area 18 with a module power density BPD, wherein the module power density BPD corresponds to the sum of the power of the LED modules 10 arranged on the base block side 3 per total area of ​​the base block side 3.

[0135] Figure 1a further shows an optional cooling device 1100, which is designed to bring the base block 2 into thermal contact with a coolant 14. Such a coolant 14 can be, for example, a dielectric liquid. Due to the high thermal conductivity of many liquids compared to air and other gases, this ensures more efficient and powerful heat dissipation from the base block. However, the coolant 14 is not limited to such liquids.

[0136] The cooling device 1100 further includes an optional coolant inlet 8 and an optional coolant outlet 9. The number of inlets and outlets is not limited by this. Using this inlet and outlet, the coolant 14 can be circulated, allowing the cooling of the base block and thus the entire component to dissipate even more heat, enabling higher power densities of the component.

[0137] Electrical inputs 6 and outputs 7 can be arranged on all sides of the base block and configured to enable electrical contact between the inputs 6 and outputs 7 and the LED modules. In particular, when using dielectric fluids, electrical inputs 6 and outputs 7 can be positioned such that they come into contact with the fluid due to their dielectric properties. Exemplary embodiments and locations of electrical inputs and outputs are also illustrated in the following figures.

[0138] The geometric shape of base block 2, and thus of building block 1, is not limited to rectangles. Any type of polygon is possible, although polygons that allow for complete surface filling are preferred, as otherwise non-luminous gaps are created.

[0139] Figure 1b describes another embodiment of a component 1 for a device for the thermal treatment of workpieces in a perspective view obliquely from above of the component 1. Figure 2 shows the same component in a perspective view obliquely from below. The component comprises a thermally conductive base block 2 with a base block top 3, a base block bottom 4, and base block side surfaces 5. The distance between the base block top 3 and the base block bottom 4 defines the thickness d of the base block 2.

[0140] Several LED modules 10 are arranged on the base block top side 3, with the light-emitting areas of the LED modules 10 together forming an LED luminous surface 11 having a luminous surface power density LPD. The LED modules 10 have an electrical contacting option, a socket, and at least one LED chip. An LED module 10 can have multiple sockets and LED chips. The actual light-emitting area of ​​an LED module 10 is formed by the sum of the areas of the respective LED chips of the LED module 10.

[0141] The luminous surface power density LPD results from the power emitted as light per LED luminous surface 11.

[0142] The module 1 has a module luminous surface 18 with a module power density BPD, wherein the module power density BPD corresponds to the sum of the power of the LED modules 10 arranged on the base block top 3 per total area of ​​the base block top 3. In the present rectangular base block 2, the total area of ​​the base block top 3 is calculated from the lengths of the base block side surfaces 5.

[0143] An electrical input 6 and an electrical output 7 are arranged on the base block's underside 4, which can be contacted, for example, in the form of electrical plug connections. These electrical inputs 6 and electrical outputs 7 extend from the base block's underside 4 to the base block's top side 3, allowing electrical contact to be made with the individual LED modules 10.

[0144] Furthermore, an optional coolant inlet 8 and an optional coolant outlet 9 are arranged on the base block underside 4. A coolant 14 can be directed into the interior of the base block 2 via the coolant inlet 8, where the coolant absorbs the waste heat from the LED modules 10 arranged on the base block top 3. The coolant 14 is directed out of the interior of the base block 2 via the coolant outlet 9, enabling effective cooling of the base block 2.

[0145] Further mechanical connection options 15 are provided on the base block's underside 4. In Fig. 2, these are designed as threaded holes, but alternative connection and fastening options are also possible. The module 1 can be attached to a bracket or supporting structure using the mechanical connection options 15.

[0146] The base block 2 is made of a thermally conductive material, for example, copper, and can have one or more channels 13, such as a lamellar structure, within its interior, through which a coolant 14, such as water, can flow. A corresponding structure of channels 13, such as a lamellar structure, is shown in Figure 6, with the coolant inlet 8 and coolant outlet 9 being arranged differently on the base block side surfaces 5.

[0147] The device power density BPD is more than 20 W / cm 2 This already allows for sufficient energy input into the surface of some thermally treated workpieces. For example, it is possible to heat a highly absorbent workpiece to temperatures of 1100 °C.

[0148] The device power density BPD can advantageously be increased as required, preferably to greater than 35 W / cm 2 , more preferably greater than 50 W / cm 2, more preferably greater than 80 W / cm 2 , more preferably greater than 100 W / cm 2 , more preferably greater than 130 W / cm 2 , more preferably greater than 200 W / cm 2 This allows for a higher energy input into the surface of workpieces to be thermally treated. However, the component power density (BPD) is less than 1000 W / cm 2 , preferably less than 600 W / cm 2 , more preferably less than 400 W / cm 2 , more preferably less than 300 W / cm 2 .

[0149] Fig. 3 shows another embodiment of a module 1 for a device for the thermal treatment of workpieces. Here, several electrical inputs 6 and several electrical outputs 7, as well as several coolant inlets 8 and several coolant outlets 9, are arranged on the base block side surfaces 5.

[0150] By arranging the respective inputs and outputs 6, 7, 8, 9 on the base block side surfaces 5, it is easily possible to connect several modules 1 to form a device 100, as shown in Fig. 5. The respective inputs and outputs 6, 7, 8, 9 are preferably designed as plug connections or corresponding couplings.

[0151] The presence of multiple electrical inputs and outputs 6, 7, in particular, also enables the control of individual LED modules 10 or LED module groups 17. This makes it possible for certain areas of the module's luminous surface 18 to emit light while other areas remain dark. An LED module group 17 is formed by combining individual LED modules 10 (see Fig. 5).

[0152] Fig. 4 shows a side view of the embodiment from Fig. 3. The illustrated electrically insulating and thermally conductive separating layer 12 between the LED modules 10 and the base block top side 3 is also provided in the exemplary embodiments from Fig. 1a and Fig. 1b. The separating layer 12 is preferably formed from aluminum nitride. The separating layer 12 does not have to be applied over the entire surface of the base block top side 3. For example, the separating layer 12 can be provided only in the areas on the base block top side 3 in which an LED module 10 is arranged. The separating layer can have various thicknesses.In preferred embodiments, the separating layer is less than 500 pm, more preferably less than 425 pm, more preferably less than 350 pm, more preferably less than 275 pm, more preferably less than 200 pm, more preferably less than 100 pm, more preferably less than 40 pm, more preferably less than 10 pm, more preferably less than 2 pm thick. In a particularly preferred embodiment, the thickness of the separating layer is 375 pm. Fig. 4 also shows an optional transparent component, for example a glass pane 16 (e.g. quartz glass), on the side of the LED modules 10 facing away from the base block top side 3. This can prevent damage to and / or contamination of the LED modules 10. In particular during thermal treatment of a workpiece with a component 1, gases, vapors or other particles can escape from the workpiece or form on the surface of the workpiece, which contaminate the LED modules 10.Furthermore, particles, gases or vapors can burn into the LED modules due to the high temperatures in the workpiece during thermal treatment, rendering them non-functional and requiring replacement.

[0153] Fig. 5 shows an embodiment of a device 100 for the thermal treatment of workpieces with several building blocks 1.

[0154] The device 100 is formed by a plurality of modules 1a to 11. Each module has a plurality of electrical inputs 6 and a plurality of electrical outputs 7, as well as a plurality of coolant inlets 8 and a plurality of coolant outlets 9.

[0155] The enlargement in Fig. 5 shows, based on the connection between modules 1 k and 11, how an electrical input 6 k of module 1 k is connected to an electrical output 7 I of module 11, and an electrical input 6 I of module 11 is connected to an electrical output 7 k of module 1 k. This applies analogously to the coolant inlet 8 k and coolant outlet 9 I, as well as the coolant inlet 8 I and coolant outlet 9 k.

[0156] The module luminous areas 18 of the modules 1a to 11 form a device luminous area 111 with a device power density VPD, wherein the device power density VPD corresponds to the sum of the power of the LED modules 10 arranged on the base block tops 3 of the modules 1a to 11 per total area of ​​the device. Analogous to the module luminous area 18, the device luminous area 111 is defined as the area corresponding to the total area of ​​the device 100 from which light is emitted, wherein the non-light-emitting areas, such as gaps between LED modules 10, gaps between the modules 1a to 11, and edge areas, are also counted.

[0157] The geometric shape of the device 100 is not limited to rectangles. Any type of polygon is possible. In particular, depending on the geometric shape of the building blocks 1, three-dimensional devices 100, i.e., not just flat ones, can be formed. For this purpose, it is particularly advantageous to combine building blocks 1 of different geometries.

[0158] Fig. 7 shows a further embodiment of the device 100, wherein the device 100 additionally has a process chamber 110. The device 100 has, in a known manner, building blocks 1a, 1b, wherein the building blocks 1a, 1b consist, in a known manner, of a base block 2 with a base block top side 3 and a base block bottom side 4, as well as the further features illustrated in Figures 1 to 4. A device luminous surface 111 is formed by the LED luminous surface 11 of the building blocks 1a, 1b.

[0159] In the arrangement shown in Fig. 7, the modules 1a, 1b are arranged in the process chamber 110 so that the light emitted by the device's luminous surface 111 can shine onto the holder 120, for example, a sample stage or sample holder. It is also possible to arrange the modules 1a, 1b on the outside of a window of the process chamber 110 so that the light emitted by the at least one module 1 shines into the process chamber 110, preferably onto the workpiece to be treated arranged in the holder 120.

[0160] Fig. 8 shows an embodiment of a suction device 200 according to the invention, comprising a turbomachine 201, lines 202, and a suction nozzle 203. The lines 202 couple the turbomachine 201 to the suction nozzle 203, so that a pressure ratio other than 1 results between the interior and the external environment at the suction nozzle. The suction nozzle 203 is designed such that a laminar flow 205 is created in the vicinity of the suction nozzle. The design of the suction nozzle

[0161] 203 may be dependent on the turbomachine 201, the power provided by the turbomachine 201 and the lines 202.

[0162] Fig. 8 also shows a module 1 according to the invention and a workpiece 204 to be thermally treated. The suction device and the module are arranged relative to the workpiece in such a way that the laminar flow 205 created in the vicinity of the suction nozzle is created between the LED illuminated surface 11 of the module 1 and the workpiece 204. The laminar flow is also directed obliquely to a plane perpendicular to the LED illuminated surface 11. Furthermore, at least one intersection point of the laminar flow with at least one such plane lies in the light field of the LED illuminated surfaces of the module 1. Any gases and / or particles that arise or escape on or in the surface of the workpiece 204 to be treated are thereby absorbed in the flow and carried away, so that the gases and / or particles do not reach the LED illuminated surface 11. This significantly reduces the risk of contamination and damage to the module.

[0163] Due to the properties of the laminar flow 205, i.e., the layered flow velocity, no turbulence or eddies are created. The thermal treatment of the workpiece 204 is thus not inhibited by the extraction device 200, since no convection occurs, which would transport heat away from the workpiece 204 to be treated. This is particularly advantageous compared to other protective devices such as glass panes, as it impedes the radiation in the light beam path. Absorption and reflection cause power losses, which in turn inhibit the thermal treatment.

[0164] Fig. 9 shows a front view of an embodiment of the suction nozzle 203 in Fig. 8. The white area represents an opening of the nozzle through which gases and / or particles can be sucked off.

[0165] Fig. 10 shows a) an exemplary side view and b) an exemplary cross-section of an embodiment of the suction nozzle 203. In this embodiment, the suction nozzle comprises a rounded lip 206. The suction nozzle 203, in particular the lip 206, is designed in conjunction with the remaining structure of the suction device (turbine 201 and lines 202) such that the resulting flow in the vicinity of the suction nozzle 203 is laminar (see arrows in Fig. 8). This is achieved particularly effectively, for example, by the rounded shape of the lip 206, since edge-free surfaces in particular promote the formation of laminar flows. Furthermore, the entry of the laminar flow into the opening of the suction nozzle 203 is then hardly disturbed by turbulence at the opening. Further embodiments of the suction nozzle and other parts of the system according to the invention can be implemented.

[0166] The description and figures describe preferred embodiments of the subject matter claimed by the appended claims. The optional features disclosed in the above description, claims, and drawings can be used both individually and in any combination to implement the subject matter claimed here according to the appended claims in their various forms.

[0167] The various aspects and embodiments described above may be combined to create yet further embodiments. These and other changes may be made to the embodiments in light of the above detailed description. In general, the terms used in the following claims should not be construed to limit the claims to the specific aspects and embodiments disclosed in the description and claims, but rather to encompass all possible embodiments, along with the full scope of equivalents to which such claims are entitled.

Claims

Patent claims 1 . Component (1 ) for a device (100) for the thermal treatment of workpieces, comprising: - a thermally conductive base block (2) with a base block side (3), - at least one electrical input (6), - an LED luminous surface (11), wherein the LED luminous surface (11) is formed by at least one LED module (10), wherein the at least one LED module (10) is arranged on the base block side (3) and is electrically conductively connected to the electrical input (6), - a module luminous surface (18) with a module power density (BPD), wherein the module power density (BPD) corresponds to the sum of the power emitted as light by the LED modules arranged on the base block side (3) per total area of ​​the base block side (3), - a separating layer (12) between the LED module (10) and the base block side (3), wherein the separating layer (12) is thermally conductive, characterized in that the component (1) further comprises at least one electrical output (7) to which the at least one LED module (10) is electrically conductively connected, that the separating layer (12) is electrically insulating and that the component power density (BPD) is greater than 20 W / cm 2 amounts.

2. Module (1) according to claim 1, wherein the base block side (3) is a base block top side (3) and the base block (2) further comprises a base block bottom side (4) and base block side surfaces (5), the module further comprising: at least one coolant inlet (8) and at least one coolant outlet (9), wherein the LED luminous surface has a luminous surface power density (LPD).

3. Building block (1) according to claim 1, further comprising a cooling device designed to bring the base block into thermal contact with a coolant.

4. Module (1) according to claim 3, the cooling device further comprising at least one coolant inlet (8) and at least one coolant outlet (9).

5. Module (1) according to claim 4, wherein the cooling device is designed to receive a coolant via the coolant inlet (8) in the base block and to discharge the received coolant from the base block via the coolant outlet (9).

6. Building block (1) according to one of the preceding claims, characterized in that the LED luminous surface (11) covers at least 60%, preferably at least 70%, more preferably at least 80%, more preferably at least 90% of the base block top side (3).

7. Module (1) according to one of the preceding claims, characterized in that several LED modules (10) form the LED luminous surface (11) of the module (1) and the LED modules (10) are designed to emit different wavelength ranges.

8. Module (1) according to claim 7, wherein a first wavelength range is in the range 425 to 600 nm and a second wavelength range is in the range 200 to 425 nm.

9. Module according to one of the preceding claims, characterized in that several LED modules (10) form the LED luminous surface (11) and several electrical inputs (6) and outputs (7) are present, which are each electrically connected to an LED module (10) or an LED module group (17).

10. Building block (1) according to one of the preceding claims, characterized in that the base block (2) has one or more channels (13), preferably a lamellar structure, through which a coolant (14), preferably a cooling fluid, can flow via the coolant inlet (8) and coolant outlet (9).

11. Building block (1) according to one of the preceding claims, characterized in that the distance between the base block top (3) and a coolant (14) that can be introduced via the coolant inlet (8) is less than 1 cm.

12. Building block (1) according to one of the preceding claims, wherein the base block side (3) is a base block top side facing the workpiece to be treated and the base block preferably further comprises a base block bottom side (2) and base block side surfaces (5).

13. Module (1) according to one of claims 2-12, characterized in that the electrical input (6) and / or electrical output (7) and / or the coolant inlet (8) and / or the coolant outlet (9) are arranged on the base block underside (2).

14. Module (1) according to one of claims 2 to 12, characterized in that the electrical input (6) and / or electrical output (7) and / or the coolant inlet (8) and / or the coolant outlet (9) are arranged on a base block side surface (2).

15. Module (1) according to one of the preceding claims, characterized in that each LED module of at least a part of the at least one LED module (10) is formed by a first transparent component, preferably a glass pane on which the side of the LED module (10) facing away from the base block side (3) is covered.

16. Building block (1) according to one of claims 1 to 15, characterized in that the LED luminous surface (11) is covered by a second transparent component (16), preferably a glass pane, on the side of the LED module (10) facing away from the base block side (3).

17. Module (1) according to claim 16, characterized in that the first transparent component is arranged between the respective LED module (10) and the second transparent component.

18. Component according to one of the preceding claims, characterized in that the LED luminous surface (11) is covered by a quartz glass (16) on the side of the LED module (10) facing away from the base block top side (3).

19. Building block (1) according to one of the preceding claims, characterized in that the base block top (3) has an area in the range of 1 to 100 cm 2 , preferably 5 to 25 cm 2 amounts.

20. Component (1) according to one of the preceding claims, wherein the component power density (BPD) is greater than 35 W / cm 2 , preferably greater than 50 W / cm 2 , more preferably greater than 80 W / cm 2 , more preferably greater than 100 W / cm 2 , more preferably greater than 130 W / cm 2 , more preferably greater than 200 W / cm 2 amounts.

21. Component (1) according to one of the preceding claims, wherein the component power density (BPD) is not greater than 1000 W / cm 2 , preferably not greater than 600 W / cm 2 , preferably not greater than 400 W / cm 2 , more preferably not greater than 300 W / cm 2 is.

22. Module (1) according to one of the preceding claims, wherein the LED luminous area (11) has a luminous area power density (LPD) which results from the power emitted as light per LED luminous area.

23. Building block (1) according to one of the preceding claims, wherein the separating layer (12) has a thickness of less than 500 pm, preferably less than 425 pm, more preferably less than 350 pm, more preferably less than 275 pm, more preferably less than 200 pm, more preferably less than 100 pm, more preferably less than 40 pm, more preferably less than 10 pm, more preferably less than 2 pm.

24. Device (100) for the thermal treatment of workpieces, characterized in that the device (100) has at least one module (1) according to one of claims 1 to 23.

25. Device (100) according to claim 24, characterized in that the device (100) is formed modularly by building blocks (1) arranged next to one another and / or is expandable.

26. Device (100) according to claim 25, characterized in that an electrical input (6) and / or coolant inlet (8) of a subsequent module (1) is connected to an electrical output (7) and / or coolant outlet (9) of a previous module (1).

27. Device (100) according to one of claims 24 to 26, wherein the module luminous surfaces (18) of the modules (1) form a device luminous surface (111) with a device power density (VPD), wherein the device power density (VPD) corresponds to the sum of the power of the LED modules arranged on the base block tops (3) of the modules (1) per total area of ​​the device (1), characterized in that the device power density (VPD) is greater than 20 W / cm 2 amounts.

28. Device (100) according to claim 27, characterized in that at a working distance of at least 1 cm, the variation of the device power density (VPD) is less than 20%, preferably less than 10%, more preferably less than 5%.

29. Device (100) according to one of claims 24 to 28, characterized in that the device (100) has a process chamber (110), wherein the at least one module (1) is arranged within or on the process chamber (110).

30. Device (100) according to one of claims 24 to 29, wherein the device power density (VPD) is greater than 35 W / cm 2 , preferably greater than 50 W / cm 2 , more preferably greater than 80 W / cm 2 , further preferably larger 100 W / cm 2 , more preferably greater than 130 W / cm 2 , more preferably greater than 200 W / cm 2 amounts.

31. Device (100) according to one of claims 24 to 30, wherein the device power density (VPD) is not greater than 1000 W / cm 2 , preferably not greater than 400 W / cm 2 , more preferably not greater than 300 W / cm 2 amounts.

32. Use of a component (1) according to one of claims 1 to 23 or of a device (100) according to one of claims 24 to 31, for the thermal treatment of a workpiece, preferably for the thermal treatment at temperatures greater than 500°C.

33. Extraction device (200) for extracting gases and / or particles which are generated during a thermal treatment of a workpiece (204) by means of a component (1) or a device (100) according to the previous claims on a surface of the treated workpiece (204), comprising: - a turbomachine (201 ), - one or more lines (202), and - a suction nozzle (203), wherein the lines (202) couple the turbomachine (201) to the suction nozzle (203) and the suction nozzle (203) is designed such that, in conjunction with the one or more lines and the turbomachine (201), it is suitable for generating a laminar flow (205) outside the suction device (200) and in an environment of the suction nozzle (203).

34. Suction device (200) according to claim 33, further comprising a blowing device which can be arranged relative to the suction nozzle in such a way that it is suitable for generating a flow of a fluid towards the suction nozzle, so that the suction area of ​​the suction nozzle is enlarged.

35. Use of a suction device (200) according to claims 33 to 34 for sucking off gases and / or particles which emerge or arise on a surface of the treated workpiece (204) during a thermal treatment of a workpiece (204), preferably with the aid of a module (1) or a device (100) according to the preceding claims.

36. System comprising: - one or more building blocks (1) according to claims 1 to 23, and - one or more suction devices (200) according to claims 33 to 34, wherein the one or more building blocks (1) and the one or more suction devices (200) can be arranged relative to a workpiece (204) in such a way that the suction devices (200) generated laminar flow (205) is created between the workpiece (204) and the LED luminous surfaces of the one or more building blocks (1) and is directed obliquely to a plane perpendicular to at least one of the one or more LED luminous surfaces of the one or more building blocks (1).

37. System according to claim 36, wherein an intersection point of the generated laminar flow with the plane perpendicular to at least one of the one or more LED luminous surfaces of the one or more building blocks (1) lies in the light field of the one or more LED luminous surfaces of the one or more building blocks (1).

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