Lighting device and user terminal equipped therewith

Abstract

The invention relates to a lighting device which is used to provide at least one geometrically contoured light outcoupling surface which lights up in a time-controlled and / or color-controlled manner and which is designed to be located, in the installed state, in an inner region of a system, on the rear side of a support structure, the outer side of which faces a system user. The lighting device according to the invention comprises an LED device and a light guiding structure having a primary body made of a translucent material and forming an in-coupling surface for at least partially coupling in the light emitted by the LED device. The geometrically contoured outcoupling surface is implemented as an elevation or boss on the primary body, and the in-coupling surface is spaced from the elevation on the primary body.

Description

[0001] Lighting device and user terminal equipped with it

[0002] The invention relates to a lighting device, in particular in the form of a lighting module that can be mounted in the form of an assembly or building block, which is located in an installed position in an interior area of ​​a system and in this case in turn on the back of a support structure, for example a front panel of a user or cash register terminal, the outer side of which faces a user and generates zones that can be illuminated in a defined manner by means of circuitry control, wherein this defined illumination of those zones serves, for example, to visually support the interaction of a user with the said system and / or initially only to locate the system and to perceive its functional range.

[0003] EP 3 494 551 B1 discloses a payment machine comprising a door element that is fully covered, including its edge, with a high-strength glass plate. The glass plate is printed on the back, and various operating modules, such as touchscreen displays, are arranged on this back. Interactions with these modules can be carried out by selectively touching the glass plate. Cutouts can also be created in the glass plate through cutting processes, allowing sufficient access to card readers, printers, cash payment systems, and change return mechanisms. This uniform front design provides an overall professional appearance and also offers advantages from the point of view of device maintenance.

[0004] The invention is based on the object of creating solutions which make it possible to generate lighting and display effects in the area of ​​a front surface of a system, in particular a cash register, which front surface is facing a user or is visible to the user, wherein the corresponding hardware is distinguished from previous approaches by a high degree of robustness and yet a high degree of design freedom with regard to the contour and position of the selectively illuminated zones - for example, even in a primarily non-translucent high-strength structure as well as in the area surrounding openings in the front surface.

[0005] This object is achieved according to the invention by a lighting device which serves to provide at least one geometrically contoured light output surface which illuminates in a time-controlled and / or color-controlled manner and which is designed to be located in an interior area of ​​a system in its installed state and in this case on the back of a support structure whose outer side faces a system user, comprising:

[0006] - an LED device and

[0007] -a light guide structure, with a primary body made of a translucent material and forming a coupling surface for at least partially coupling the light emitted by the LED device by circuit-based control of the same, wherein

[0008] - the geometrically contoured light coupling surface is realized as an elevation or boss of the primary body and

[0009] - the coupling surface is spaced from the elevation of the primary body and / or laterally offset from it.

[0010] This advantageously makes it possible to create a lighting device which can be attached to the inside of a front panel facing the interior of the device and which provides defined illuminated symbols or patterns in accordance with the contours of the elevations, wherein the rear area of ​​the elevations can be supported and covered in a relatively resilient manner.

[0011] The lighting device is preferably designed such that the elevation or boss is configured to sit in a complementary recess or depression in the support structure when installed. This recess in the support structure can be produced by cutting, punching, or machining. The recess in the support structure can represent an opening with the same contour as the boss or elevation and be completely filled by the boss or elevation. The boss and the support structure can then be geometrically coordinated such that the light-emitting surface of the boss or elevation forms a flat surface that is relatively precisely aligned with the outer surface of the support surface, creating the impression of a plane.The support structure can in particular be designed as a brushed or blasted metal plate. The material of the primary body can be colored by coloring or mixing in particles so that it offers the same or a similar color appearance to the front surface of the support structure in normal ambient light. The surface roughness of the light exit surface and any traces running therein can also be designed such that, when unlit, the light exit zones in the front surface of the support structure are at least barely perceptible. The support structure and the bosses immersed in it can be covered again on the front side by a transparent or translucent layer, film, or coating. It is also possible to design the bosses geometrically so that their immersion depth into the recesses of the support structure is less than the total plate thickness of the support structure.This approach is particularly advantageous for designs of the support structure as a sandwich component.

[0012] A particularly advantageous approach for realizing and implementing the lighting device according to the invention from a manufacturing perspective consists in exporting the geometric data intended for manufacturing the support structure or the openings contoured complementarily to the bosses or elevations and using them in parallel to define the geometry of the primary body. Thus, the production of the front panel of a cash register or payment terminal can be linked to the production of the lighting modules using CIM. The lighting device can also be available in various standard dimensions, and the respective geometric data can then be used when coordinating the front panel.

[0013] According to a particular aspect of the present invention, the geometrically contoured elevation preferably has the contour of a symbol or part of a symbol, or appears as a stripe or angle in plan view. The width of the stripe can be a few millimeters up to 2 centimeters. The dimensions of the elevation or boss and the dimensions of the openings or pockets accommodating them are coordinated such that a slight interference fit, but preferably a movement fit, results in the complementary receptacle of the support structure.

[0014] The primary body can be designed to have several elevations or bosses, possibly arranged in a row or along a line, each of which provides coupling surfaces. The length of the elevations or bosses is adjusted so that the openings in the support structure that accommodate these bosses do not result in excessive weakening of the support structure. A sufficiently wide web zone is preferably left between successive bosses to ensure adequate material bonding within the support structure.

[0015] The primary body is further preferably configured to include a seat surface and a rear surface facing away from the seat surface. The coupling surface is preferably formed by an outer peripheral surface of the primary body and / or by its rear surface. Alternatively, it is also possible to form the coupling surface by an inner peripheral surface of the primary body.

[0016] The above-mentioned seating surface of the primary body can advantageously be designed as a flat surface, which preferably sits on the back of the support structure in a sealing manner by incorporating a sealing layer.

[0017] The primary body can advantageously be designed as a flat torus or flat polygon, or as a flat ring- or collar-like structure. The primary body is relatively flat compared to its longitudinal and transverse extent or its mean diameter. The elevations rise essentially perpendicular to a main plane defined by the primary body, which in turn is aligned essentially parallel to the seat surface.

[0018] The outer peripheral surface of the primary body, which is preferably used for light coupling, extends between the seat surface and the rear surface. The primary body can be a single-piece structure, or it can be composed of multiple elements, components, or segments.

[0019] The primary body is preferably made of a glass or plastic material. The primary body's geometry can be achieved by machining and / or an additive manufacturing process, particularly 3D printing.

[0020] Advantageously, the lighting device is designed such that a shielding device is provided for shielding light emerging from a rear region of the light guide structure facing away from the coupling-out surface. This shielding device can be formed by a housing that encloses the rear region of the lighting device.

[0021] According to a particular aspect of the present invention, a particularly advantageous design of the LED device is provided in that it comprises a flexible carrier strip designed in the manner of a flat, narrow strip with LED elements arranged sequentially thereon. The LED elements on the carrier strip are preferably individually addressable.

[0022] The lighting device can advantageously be designed such that it forms a lighting module that can be mounted in an assembly or modular manner and surrounds a device assigned to the lighting device. This device can be a card reader, a cash acceptance module, a printer, a scanner, or a hopper device into which objects can be inserted or dispensed. The lighting device according to the invention surrounds the connection point of these devices on the support structure, in particular a front panel, and forms auxiliary lighting that selectively identifies this location to the user through independent control.

[0023] According to a particularly preferred embodiment of the invention, an opening can be provided in the support structure through which the device, for example, a card reader, is accessible or exposed. The lighting device is designed and arranged such that the bosses or elevations supported by it surround this opening, leaving a narrow inner edge on the support structure.

[0024] The lighting device is preferably designed such that it can be mounted on a support structure, in particular a plate, separately from the device assigned to it, in particular a card reader. Thus, the support structure can be completed in terms of lighting technology, and the more complex systems attached to the support structure or covered by it are decoupled from the lighting device. Preferably, several lighting devices according to the invention are connected to the support structure. The support structure can form a door element, which, together with the

[0025] Lighting devices can be swung open, whereby the

[0026] Functional units assigned to lighting devices, such as card readers and coin dispensers, can be stationary or fixed to another support - then frontally on this.

[0027] The openings or recesses formed in that plate or support structure are complementary to the arrangement of the elevations or bosses on the primary body and, when installed, the elevations or bosses sit in these openings or recesses.

[0028] The lighting device is used to visualize zones through contoured light emission areas and to support the interaction of a user with the system comprising the lighting device.

[0029] It is also possible to design the primary body in such a way that it also forms holding devices or one or more receiving slots for the flexible LED circuit board strip, so that the translucent primary body, which primarily functions as a light-guiding structure, also functions as a holding element or as an element for the functional integration and combination of components of the module. In particular, when the primary body is manufactured using an additive manufacturing process, in particular 3D printing, the primary body can have areas with different light transmittance, as well as internal light bulkheads that prevent or reduce overexposure of light. This measure makes it possible to individually illuminate several geometrically contoured bosses provided by the primary body by individually and in particular sequentially controlling the LED nests of the flexible LED circuit board strip.

[0030] The lighting device can be connected to the support structure in a mechanically resilient and preferably sealed manner. This sealing can be achieved by a sealing device surrounding the raised portions or bosses in conjunction with the rear surface of the support structure. The sealing device can be made of a flat material layer, preferably a foamed elastomer material. The sealing can be further enhanced by adhesive bonding.

[0031] The object stated at the outset is also achieved according to a further aspect of the present invention by a user terminal having a main housing and a front panel, wherein a plurality of interaction devices for interaction with a user are accessible via the front panel, and in the arrangement region of at least one of these interaction devices, a lighting device of the type described above is attached to the front panel on a side facing away from the user, so that a ring is created which surrounds the arrangement position of the interaction device and which is composed of successive geometric elements and provides luminous zones according to the contour of the elements.

[0032] With regard to the structure of a user terminal, reference is made to EP 3494 551 B1 cited above, which is attributed to the applicant, the content of which is hereby incorporated in its entirety into the present application.

[0033] Further details and features of the invention will become apparent from the following description taken in conjunction with the drawing. It shows:

[0034] Figure 1 is a perspective view of a lighting device according to the invention to explain its internal structure; Figure 2 is a perspective exploded view of the lighting device according to the invention according to Figure 1, in particular to highlight the structure and spatial geometry of the primary body;

[0035] Figure 3 is a sectional view of the lighting device according to the invention, in particular to illustrate the coupling of the light emitted by the LED strip into the primary body radially from the outside;

[0036] Figure 4 shows a further perspective exploded view of a lighting device according to the invention, in particular in a modified manner with regard to the boss height and housing details;

[0037] Figure 5 is a sectional view of the lighting device according to the invention, according to Figure 4;

[0038] Figure 6 is a perspective view of the rear area of ​​a housing for a lighting device according to the invention.

[0039] The illustration in Figure 1 shows a lighting device which serves to provide at least one geometrically contoured light output surface FA which illuminates in a time- and / or color-controlled manner. The lighting device is designed, in the installed state, to be arranged in an interior region of a system and in this case on the back of a support structure. The outer side of the support structure then faces a system user. The lighting device according to the invention comprises an LED device 2 and a light-guiding structure 3. The light-guiding structure 3 has a primary body 3a which is made of a translucent material and forms an input surface FE for at least partially coupling in the light emitted by the LED device 2. The geometrically contoured output surface FA is implemented as an elevation or boss 3b of the primary body 3a.The coupling surface FE is spaced from the elevation 3b of the primary body 3a, in particular laterally offset from it.

[0040] The structure shown here makes it possible to create a lighting device that can be attached to the inside of a front panel facing the device interior and, in accordance with the contours of the elevations 3b, provides defined illuminated geometric elements, symbols, or patterns, wherein the rear area of ​​the elevations 3b can be supported and covered in a relatively resilient manner. The elevation 3b or boss 3b is designed, when installed, to sit in a complementary recess, opening, groove, or depression in the support structure. The geometrically contoured elevation 3b has the contour of a geometric element, a symbol, or part of a symbol and appears, as can be seen here, in plan view as a stripe or angle.

[0041] In the embodiment shown here, the primary body 3a forms several elevations 3b or bosses 3b, each of which provides coupling surfaces FA. The primary body 3a further comprises a seat surface FS and a rear surface FR facing away from it.

[0042] The coupling surface FE is formed by an outer circumferential surface FU of the primary body 3a and / or by its rear surface FR. The seating surface FS is designed as a flat surface. The primary body 3a is designed as a flat torus or flat polygon or as a ring- or collar-like structure. The outer circumferential surface FU extends between the seating surface FS and the rear surface FR. The primary body 3a is manufactured here as a one-piece component; it can also be manufactured as a built-up structure and then consist of several segments. The primary body 3a is also made of a plastic material here, which is also machined from a sheet material. It can also be formed by an additive manufacturing process, in particular a 3D printing process; the corresponding geometric data is preferably generated synchronously during the design of the support structure.

[0043] The lighting device comprises a shielding device, which also functions as a housing 5, for shielding light emerging from a rear area of ​​the light guide structure 3 facing away from the coupling-out surface FA.

[0044] The LED device 2 comprises a flexible carrier strip 2b designed like a flat, narrow strip with LED elements 2a arranged sequentially thereon. The LED elements 2a on the carrier strip 2b are individually controllable. The lighting device forms a lighting module that can be assembled as an assembly or modular unit and surrounds a device assigned to the lighting device, such as a ticket printer or a coin and note acceptance device.

[0045] The lighting device according to the invention is particularly suitable for applications in which an opening is provided in the support structure through which the device, for example a card reader, is accessible or exposed. The lighting device surrounds this opening. The lighting device can be mounted separately from the device assigned to it, in particular a card reader, on a support structure, in particular a plate. Openings or recesses are then formed in that plate of the support structure, and these openings or recesses are designed to complement the arrangement of the elevations or bosses. In the installed state, the elevations 3b or bosses 3b sit in these openings or recesses.

[0046] The lighting device is used to visualize zones in a front panel through contoured light emission areas, thereby supporting user interaction with the system comprising the lighting device. The lighting device is mechanically resilient and can be sealed to the support structure. This sealing can advantageously be achieved by a sealing device surrounding the raised portions 3b or bosses 3b in conjunction with the rear surface of the support structure.

[0047] The lighting device according to the invention offers a modular structure, for example, consisting of one Plexiglas primary body in a translucent version, depending on the specifications. The lighting module is suitable as a back-glass lighting module and in particular as a lighting module for non-translucent housings. The lighting module is preferably housed in a metal housing, particularly a powder-coated aluminum housing, realized as a drawn or folded part, and provides electrical connection points that allow the lighting module to be operated as a plug-and-play unit.

[0048] The lighting device can be mounted on the support structure in particular by means of several, for example four, consecutive spacer bolts, so that no inadmissible load on the lighting device results from excessive screw tightening torques.

[0049] The LED device 2 is enclosed and covered by the aluminum housing 5 and protected against external influences or other influences such as moisture, dust deposits, damage, or improper storage. Electrically, only the circuit board strip 2b can be subject to malfunction. This can be replaced after removal of the aluminum housing 5, if necessary, without significant additional assembly work. The illustration in Figure 2 illustrates the structure of the lighting device according to the invention in the form of an exploded view. This illustration shows the flat, torus-shaped primary body 3 made from a translucent material with the bosses 3b projecting beyond its seating surface SF. Also visible in this illustration are the housing 5 and the LED strip 2b located therein. The LED strip 2b is connected to an inner wall area of ​​the housing 5 and can be mounted together with it.The LEDs 2a supported by the LED strip can be selectively activated, particularly with regard to activity, color, and brightness. The emitted light is coupled into the primary body 3 via the peripheral surface FU and the rear side FR. This light travels a distance within the primary body 3, is scattered, and redirected until it penetrates the material forming the bosses 3b.

[0050] A sealing device 6 is located on the seating surface SF of the primary body 3. It has perforations that are matched to the contour and position of the bosses 3b of the primary body 3. The base body 3 is secured in the housing 5 via connecting means 7a, 7b. A gap remains between the rear side FR of the primary body 3 and the inner surface of the housing 5, through which light can penetrate into the primary body 3.

[0051] The illustration in Figure 3 shows the structure of the lighting device according to the invention in axial section. The housing 5 forms a shell structure that acts as a support for the LED strip 2b. The primary body 3 is fixed in this housing 5. The seating surface SF of the primary body 3 is covered with a sealing layer 6. The light is coupled into the primary body 3 radially from the outside into its outer circumferential surface FU, as well as into its rear side FR, which is spaced from the housing 5. This lighting device is designed as a preassembled module and, as such, can be attached to the front panel of a cash register from the inside.

[0052] The illustration in Figure 4 shows a further embodiment of an illumination device according to the invention, which is also designed in such a way that it is able to provide at least one geometrically contoured light output surface FA which illuminates in a time- and / or color-controlled manner.

[0053] This lighting device can be installed in the same way as the variant shown in Figure 1, in an installed state in an interior area of ​​a system, and in this case again on the back of a support structure. The lighting device according to the invention comprises an LED device 2 formed by a ribbon-like, flexible carrier or circuit board strip 2b equipped with LED nests 2a in succession.

[0054] The lighting device comprises a light-guiding structure 3, which in this example is machined from a translucent sheet material, in particular Plexiglas, using an NC milling process. The light-guiding structure 3 has a primary body 3a made of a translucent material and forms a coupling surface FE for at least partially coupling in the light emitted by the LED device 2. The geometrically contoured coupling-out surface FA is realized as a protrusion or boss 3b of the primary body 3a. The coupling surface FE is spaced from the protrusion 3b of the primary body 3a, in particular laterally offset from it.

[0055] The elevations 3b form angle elements, with rectangular blocks arranged between them and aligned with the sides of the angles. Overall, this results in a substantially square ring containing angle elements at its corners and rectangular block strips arranged between them. This lighting device is particularly suitable for illuminating an opening or a device location that is partially exposed via a front panel. This includes, in particular, a card reader, a cash acceptance module, a ticket printer, a cash return tray, or a deposit compartment, for example, for an ID card or other document, including vouchers.

[0056] In this embodiment, the LED device 2 also consists of a flexible, flat, narrow carrier strip 2b, which rests against the inner wall of the housing 5 and thus illuminates the primary body 3a radially from the outside.

[0057] The illustration in Figure 5 further illustrates the internal structure of the lighting device according to the invention shown in Figure 4. As can be seen from this illustration, the housing 5 forms a relatively solid inner peripheral wall 5a, which, when installed, surrounds a through-opening and is positioned on a complementary inner step of a support structure via a narrow shoulder 5b. This housing 5 can be manufactured as a plastic component or, in particular, as a milled aluminum part.

[0058] The light-guiding structure 3 is supported axially within this housing 5 on an insert part 8, which here is formed from a flat sheet metal strip produced by bending. The illustration in Figure 6 illustrates the structure of a housing 5 for the rear cover of the internal light-guiding structure (not visible here). The housing 5 is made of a metal material, in particular aluminum sheet, and consists of an outer peripheral wall 5c, a base wall 5e, and an inner peripheral wall 5a. The walls are manufactured as cut parts and joined together by interlocking. The housing 5 can also be manufactured as a molded or deep-drawn part.

[0059] It is possible to design the lighting device in such a way that the LED light strip 2b can be easily inserted into the lighting device through an opening in the housing, which is not necessarily but preferably made of metal and is in turn made of aluminum. The lighting devices can then, if necessary, initially be installed in a configuration without LED strips. It is also possible for simple applications to illuminate the primary body from behind with another light source, omitting the aluminum housing. This can be done particularly when the lighting device is installed in simple posts. Or in device zones where the primary body is illuminated by only weak background lighting.

[0060] The housing 5 and the LED strip 2b can be combined to form a lighting element assembly, in which the LED strip 2b is first fixed to the housing 5 and then the housing 5 is placed onto the primary body 3. This approach can be implemented in particular in a form in which the primary body is first mounted as an "electrically dead" component on the support structure, for example an inner side of a front panel of a cash register, wherein the cover housing 5 containing the LED board can then be subsequently attached, possibly without tools, in particular by clamping and / or snapping on, for example.

[0061] The modular design of the lighting unit allows for backlighting or transillumination of glass panes, as well as sheet metal structures, sandwich panels, or molded parts. The lighting arrangement according to the invention is particularly suitable for implementing highly vandal-resistant front surfaces of terminals, such as payment or ticket machines. In this case, the inventive concept allows for the realization of lighting effects in sufficiently robust housing fronts that display symbols illuminated synchronously with interaction and support user guidance.

[0062] The lighting device can be used independently of the device assigned to it (e.g.

[0063] Card reader, coin slot, etc.) are mounted on the support structure. Preferably, each LED element can be controlled via a control device. This control device can be designed as a subassembly that is mounted on the support structure and is configurable using software. This control device provides, for example, a collective interface with 20 connections. During configuration, specific lighting modes can be defined for the individual LED elements, and individual LEDs or LED nests can be grouped. This subassembly then provides a signal standard on which the main control system or the individual lighting devices mounted on the support structure can communicate with the subassembly.

[0064] Especially when mounting multiple lighting devices on a plate-like support structure, it is possible to use the control of a selected lighting device as the master control. The lighting devices can also be controlled via a bus system, possibly with dynamic addressing; the corresponding interface is preferably located directly on the flexible strip-like printed circuit board.

[0065] Instead of implementing the LED device with a flexible circuit board strip that completely surrounds the primary body, it is also possible to design the circuit board as a flexible foil body that includes defined, angled partitions, so that this foil body can be placed on the primary body on a back side facing away from the bosses and is then overhanged by a flat, shell-like or ring-shell-like housing.

[0066] The lighting device can comprise a resilient cover on its rear side, by means of which the primary body can be firmly connected, in particular screwed, from behind to the support structure assigned to it, so that even in the event of the use of force, the bosses sitting in the support structure cannot easily be forced inwards and, if necessary, access can be gained to the equipment surrounded by the lighting device.

[0067] The lighting device according to the invention is particularly suitable as a highly stable lighting device for creating symbolically illuminated zones in a resilient and non-transparent plate structure.

[0068] The lighting device according to the invention can be designed as an add-on device for a cash register and an emergency operating mode can be prepared in which this system still provides minimum functions without the illuminative user guidance.

[0069] It is also possible to design the lighting device in such a way that the temporarily controlled illuminated zones provided by it have a contour that forms part of a canon of shapes that can be used and implemented for other equipment, in particular the upper ends of gate posts, pillars, steles, and barrier housings for lighting devices. The lighting device according to the invention can thus be implemented as a standard module that can be installed in various mounting systems.

Claims

Patent claims 1. A lighting device which serves to provide at least one geometrically contoured light output surface which illuminates in a time-controlled and / or colour-controlled manner and which is designed to be located, in the installed state, in an interior area of a system and in this case on the back of a support structure whose outer side faces a system user, comprising: - an LED device and -a light guide structure, with a primary body made of a translucent material and forming a coupling surface for at least partially coupling the light emitted by the LED device, wherein - the geometrically contoured coupling surface is realized as a front surface of a protrusion or boss of the primary body and - the coupling surface is spaced from the elevation of the primary body.

2. Lighting device according to claim 1, characterized in that the elevation or boss is designed to sit in a complementary recess or depression of the support structure when installed.

3. Lighting device according to claim 1 or 2, characterized in that the geometrically contoured elevation has the contour of a symbol or part of a symbol or appears in plan view as a stripe or angle.

4. Lighting device according to at least one of claims 1 to 3, characterized in that the primary body has a plurality of elevations or bosses, each of which provides coupling-out surfaces and / or that the primary body comprises a seating surface and a rear surface facing away from the seating surface and / or that the coupling-in surface is formed by an outer peripheral surface of the primary body and / or by its rear surface.

5. Lighting device according to at least one of claims 1 to 4, characterized in that the coupling surface is formed by an inner circumferential surface of the primary body and / or that the seating surface is designed as a flat surface and / or that the primary body is designed as a flat torus or flat polygon or as a ring-like or collar-like structure.

6. Lighting device according to at least one of claims 1 to 5, characterized in that a shielding device is provided for shielding light emerging from a rear region of the light guide structure facing away from the coupling-out surface.

7. Lighting device according to at least one of claims 1 to 6, characterized in that the LED device comprises a flexible carrier strip designed in the manner of a flat, narrow band with LED elements arranged sequentially thereon.

8. Lighting device according to claim 7, characterized in that the LED elements on the carrier strip can be individually controlled.

9. Lighting device according to at least one of claims 1 to 8, characterized in that the lighting device forms a lighting module which can be mounted in the manner of an assembly or building block and which surrounds a device assigned to the lighting device and / or that an opening or aperture is provided in the support structure via which the device, for example a card reader, is accessible or exposed and that the lighting device surrounds this opening.

10. A user terminal having a main housing and a front panel, wherein a plurality of interaction devices for interaction with a user are accessible via the front panel, and in the arrangement region of at least one of these interaction devices, a lighting device according to at least one of claims 1 to 9 is attached to the front panel on a side facing away from the user, so that a light ring is created surrounding the arrangement position of the interaction device, which light ring is composed of successive geometric elements.

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