Modular lighting unit

Abstract

The present invention relates to a modular lighting unit (10) which has at least two module units (12, 30), comprising: a first module unit (12) which is annular and has a central cut-out (20), wherein at least one semiconductor light source (22) and at least one electronic component (24) are located on a surface of the first module unit (12); and a second module unit (30) which is formed in two parts, so that the second module unit (30) has a first portion (34) and a second portion (36) which are disposed, in an operational state, with respect to one another in such a way that they surround the first module unit (12), wherein the first portion (34) and the second portion (36) each have a central cut-out (38a, 38b) which is concentric with respect to the central cut-out (20) of the first module unit (12) in the operational state, wherein the first portion (34) has a first engagement portion (44) which engages with a first counter engagement portion (50) of the first module unit (12) in the operational state in order to secure the first portion (34) on the first module unit (12), and the second portion (36) has a second engagement portion (64) which engages with the first counter engagement portion (50) in the operational state, so that the first portion (34) and the first module unit (12) cannot be detached from one another. The invention also relates to a method for designing the modular lighting unit (10) and to a modular lighting system (120).

Description

[0001] Modular lighting unit

[0002] Description

[0003] The present invention relates to a modular lighting unit and a method for constructing the modular lighting unit according to the invention. Furthermore, the invention relates to a modular lighting system.

[0004] Lighting units are generally known as those comprising a light source that can be mounted on walls or ceilings, for example. The light sources used in these units have changed considerably in recent years. Conventional light sources, in particular the widespread incandescent and fluorescent lamps with screw bases, which are commonly referred to as "light bulbs", have largely been replaced by modern semiconductor light sources. In this context, light-emitting diodes, which are usually arranged on circuit boards and are referred to below as LEDs ("Light Emitting Diodes"), are particularly worth mentioning. Compared to incandescent bulbs, LEDs produce light much more efficiently because they convert electrical energy directly into light and less electrical energy is released into the environment in the form of heat.

[0005] Another advantageous aspect of using LEDs is their longevity. LEDs generally function for many years and can therefore be operated with reduced maintenance. Consequently, the use of LEDs has also proven successful for sustainability reasons. However, it has been found that the lifespan of luminaires or lighting units that incorporate LEDs is much shorter than that of conventional lighting units, which include, for example, incandescent bulbs. This is due to the fact that if one or more permanently installed LEDs fail, the entire lighting unit must be replaced. Such devices are often disposed of immediately and replaced with new lighting units, as repairing the defective components is often not cost-effective.This results not only in high costs but also in large quantities of electronic waste, as the lighting units are difficult to recycle due to their complex structure and the large number of permanently installed components and materials.

[0006] To counteract this trend, some manufacturers have already begun offering modular products. For example, EP 3 132 187 B1 discloses a luminaire comprising a lighting module. This module has a ring-shaped circuit board on which several semiconductor light sources and electronic components are arranged. In the event of a defect in one of the semiconductor light sources and / or electronic components, the lighting module, which is connected to a luminaire cover via snap-in and screw connections, can be replaced. Consequently, the entire luminaire does not need to be disposed of, but only individual modular components.

[0007] Such a lighting design may be quite practical if individual lighting modules require maintenance or replacement. In practice, however, it is more common, for example in the field of technical building equipment, for multiple lighting units to be flexibly adapted to the specific conditions at the site of use with minimal time and effort. Particularly in open-plan offices, which often comprise hundreds of lighting units, an enormous amount of work is required for the installation, maintenance, and replacement of the lighting units. If such lighting units feature complex connecting elements, especially connecting elements that require the use of tools, the assembly of the modular lighting unit becomes extremely time-consuming.Furthermore, this can also increase the risk of faulty or incorrect installation of the lighting unit, as there is a possibility that an installer who has to install a number of lighting units “overhead” in a relatively short space of time. 1 must install, one or more of the complex connecting elements are inadvertently assembled incorrectly. It is therefore the object of the present invention to provide a modular lighting unit which has modules that are particularly easy to connect and replace, in order to enable time-efficient assembly of the lighting unit, and which is further configured such that incorrect assembly of the lighting unit is not possible or immediately apparent.

[0008] This object is achieved according to the invention in a first aspect by a modular lighting unit which has at least two module units, comprising a first module unit which is ring-shaped and has a central recess, wherein at least one semiconductor light source and at least one electronic component is arranged on a surface of the first module unit, and a second module unit which is formed in two parts, so that the second module unit has a first section and a second section which, in an operational state, are arranged relative to one another such that they enclose the first module unit, wherein the first section and the second section each have a central recess which, in the operational state, is concentric with the central recess of the first module unit, wherein the first section comprises a first engagement section,which, in the operational state, engages with a first counter-engagement portion of the first module unit to secure the first portion to the first module unit, and the second portion comprises a second engagement portion which, in the operational state, engages with the first counter-engagement portion such that the first portion and the first module unit are not detachable from each other.

[0009] The first module unit can, in particular, be a ring-shaped printed circuit board or circuit board with a central recess. The at least one semiconductor light source of the first module unit can, in particular, be an LED, although in practice it is quite common for a plurality of semiconductor light sources or LEDs to be used. The same applies to the at least one electronic component arranged on the first module unit, which can, among other things, correspond to an LED driver or driver electronics, but is not limited to this function. Arranging the LEDs together with the associated driver electronics on a common module unit is particularly advantageous because the compatibility of the two components is ensured if the corresponding module unit is replaced.In the modular lighting unit according to the invention, both monochrome and multichrome LEDs can be used so that a desired color spectrum can be generated.

[0010] The semiconductor light sources and the electronic components can be arranged arbitrarily on the first module unit, but they are preferably arranged such that the semiconductor light sources are mounted continuously in an outer region in the circumferential direction of the first module unit, i.e., away from the central recess, and the electronic components are mounted in an inner region, i.e., close to the central recess. This arrangement has the advantage that the light emitted by the semiconductor light sources is only slightly affected by the electronic components and the remaining components of the modular lighting unit.

[0011] Furthermore, the semiconductor light sources can be arranged equidistant from one another in the circumferential direction of the annular first module unit and extend over the entire circumference of the first module unit, thus enabling homogeneous light emission. Preferably, the electronic components are provided on the same side or on the same surface of the first module unit as the semiconductor light sources, thereby ensuring the lowest possible height of the first module unit. Alternatively, the semiconductor light sources and the electronic components can also be formed on the opposite surfaces of the first module unit.

[0012] Cables to the electronic components can be routed through the central recess to supply the modular lighting unit with power. Furthermore, the first module unit preferably completely encloses the central recess. Optionally, however, the first module unit can also have one or more slots extending radially from the central recess and partially or completely penetrating the first module unit. The first module unit is also configured to efficiently dissipate the waste heat generated by the semiconductor light sources and the electronic components to the second module unit and / or into the immediate vicinity of the modular lighting unit.

[0013] The two-part second module unit is particularly designed to accommodate the first module unit in a form-fitting manner. Therefore, the first and second sections of the second module unit can also be annular. In the operational state, at least one of the two sections of the second module unit overlaps the surface of the first module unit on which the semiconductor light sources are arranged. At this point, it should be noted that an operational state within the meaning of the present invention is understood to mean a state in which the modular lighting unit according to the invention is constructed in a functionally functional manner and the lighting means of the modular lighting unit are capable of illuminating a desired area.

[0014] Furthermore, the second module unit also serves to protect the first module unit. Since the second module unit encloses the first module unit in the operational state, the first module unit can be protected from mechanical and chemical stress. This also makes it more difficult for dust and insects to penetrate the first module unit. The second module unit also acts as a contact guard for the semiconductor light sources and the electronic components, preventing accidental contact with these components. Furthermore, the second module unit is preferably made of an electrically insulating material.

[0015] The central recesses of the first and second sections of the second module unit can have the same diameter as the central recesses of the first module unit. Alternatively, however, they can also be formed with a larger or smaller diameter. In particular, the central recesses included in the modular lighting unit have a common center in the operational state, so that they are concentric with one another.

[0016] Preferably, the first section of the second module unit is configured with a larger diameter than the first module unit, so that the first section completely covers a surface of the first module unit in the operational state and protrudes beyond an outer edge of the first module unit in the radial direction of the modular lighting unit. The first section can, in particular, cover the surface of the first module unit that does not have any semiconductor light sources.

[0017] According to the invention, the first section of the second module unit comprises a first engagement section. This first engagement section is designed such that, in the ready-to-operate state, it engages or is connected to a complementary first counter-engagement section of the first module unit. Through this engagement, the first section of the second module unit is secured flatly to the first module unit, wherein, during the connection of the two components, their central recesses are also arranged concentrically to one another. Furthermore, the engagement represents a first interface, which preferably comprises a rotating mechanism. Alternatively or additionally, the first interface can also have another connection mechanism, for example a latching or plug-in mechanism.According to the invention, the first interface is designed such that the installer can engage the first engagement section and the first counter-engagement section manually, i.e., the use of a tool is not necessary. The first interface can also be released manually, in particular without tools, so that the first interface can be operated extremely time-efficiently.

[0018] Furthermore, according to the invention, the first interface is configured such that, in the state in which the first engagement portion engages with the first counter-engagement portion, i.e., the first interface is formed, a partial region of the first counter-engagement portion is configured such that a second engagement portion of the second portion of the second module unit can be brought into engagement therewith, in particular likewise without tools. Thus, a second interface is defined by the engagement between the second engagement portion and the first counter-engagement portion.

[0019] A prerequisite for forming the second interface is that the first interface has been formed completely and correctly. This means that the second engagement section cannot engage the first mating engagement section if the first engagement section is not fully engaged with the first mating engagement section. This mechanism prevents the installer from accidentally assembling the modular lighting unit incorrectly, as this is simply not possible due to the inventive design of the first and second interfaces.

[0020] Furthermore, the correct construction of the modular lighting unit according to the invention according to the first aspect requires that, in the operational state, the first engagement section is fully engaged with the first counter-engagement section, and the second engagement section is engaged with a partial area of ​​the first counter-engagement section released by the first engagement section. If this is the case, both the first section and the second section of the second module unit are secured to the first module unit and completely enclose it.

[0021] Furthermore, detaching the first interface is also impossible as long as the second interface is configured according to the connected or operational state. This means that a prescribed sequence of disassembly steps also exists for disassembling the modular lighting unit. Consequently, there is no possibility of the installer disassembling the modular lighting unit incorrectly, which also minimizes the risk of damage to the modular lighting unit.

[0022] The first engagement portion can be formed, for example, in the form of a pin or a screw, in particular a flat screw, which is provided on a surface of the first portion. The first counter-engagement portion can be formed correspondingly complementary thereto, for example in the form of an elongated or slot-shaped recess. Furthermore, the first counter-engagement portion can have a diameter at a predetermined position that corresponds at least to the diameter of the first engagement portion. As a result, the first engagement portion can be inserted into the first counter-engagement portion at the predetermined position and subsequently transferred into a locking position by turning or rotating the first portion or the first module unit in the circumferential direction of the modular lighting unit.

[0023] By locking the first engagement section in the locking position of the first counter-engagement section, the modular lighting unit is placed in a rotationally fixed state, allowing the installer to clearly determine that the first interface is correctly configured. The first engagement section can be configured such that it can only be moved from its locking position by actuating a locking mechanism. Consequently, the first interface can be released by actuating the locking mechanism. As an alternative to the described design of the first interface, it can also be designed, among other things, in the form of a bayonet lock.

[0024] In a preferred embodiment of the modular lighting unit according to the invention, the second engagement section, in the operational state, can engage the first counter-engagement section to secure the second section to the first modular unit. In particular, it can be provided that the second engagement section engages a partial area of ​​the first counter-engagement section that does not overlap the locking position of the first engagement section. This partial area is particularly configured so that the second engagement section cannot be inserted into it when the first engagement section is located in the partial area.The second engagement section can preferably be designed as an angled and / or protruding wing, which, for transferring the second section of the second module unit into the operational state, can be at least partially engaged with the partial area of ​​the first counter-engagement section and can be rotated or pivoted in the circumferential direction of the modular lighting unit in order to be displaced into a receptacle of the first module unit. Thus, the first module unit can be secured to the second section and completely enclosed by the second module unit.

[0025] Optionally, the first engagement section can comprise a plurality of first engagement elements arranged on a surface of the first section of the second module unit, and wherein each first engagement element, in the ready-to-operate state, engages with a respective first complementary region of the first counter-engagement section. A first engagement element can in particular correspond to a flat screw, which can engage in an elongated recess of the first counter-engagement section and, during the engagement, can be displaced into a locking position in order to form the first interface. Thus, the elongated recess can define the first complementary region. For example, two or more, preferably four, first engagement elements can be provided, which can be arranged evenly distributed in the circumferential direction of the first section on a surface thereof.It is understood that the first complementary regions of the first counter-engagement section are arranged on a surface of the first module unit in such a way that the first engagement elements can engage therein. The described arrangement of the engagement elements and the complementary regions can, in particular, ensure that the first module unit and the first section of the second module unit are secured to one another in a rotationally fixed manner.

[0026] In an advantageous embodiment of the modular lighting unit according to the invention, the second engagement section can comprise a plurality of second engagement elements arranged on a surface of the second section of the second module unit, and wherein each second engagement element, in the ready-to-operate state, engages with a respective second complementary region of the first counter-engagement section. The second engagement elements can be designed in the form of angled and / or protruding wings and, starting from an at least partially formed engagement with a respective partial region of the first counter-engagement section, can be displaced into a respective receptacle of the first module unit in order to form the second interface. The receptacle can define the second complementary region.

[0027] In order to displace the second engagement elements into a respective receptacle, the second section of the second module unit can be configured to be rotatable or pivotable in the circumferential direction of the modular lighting unit as soon as the second engagement elements are at least partially engaged with a respective sub-region of the first counter-engagement section. During assembly of the modular lighting unit, the direction of rotation or displacement of a second engagement element can, starting from the sub-region of the first counter-engagement section, be configured in particular opposite to the direction of rotation or displacement of a first engagement element. This has the advantage that the locking mechanism of the first interface is not overlaid by the configured second interface in the operational state, thereby making dismantling the modular lighting unit easier for the installer.

[0028] Furthermore, the second section of the second module unit can comprise a third engagement section which, in the ready-to-operate state, engages with a second counter-engagement section of the first module unit in order to connect the second section to the first module unit in a rotationally fixed manner, wherein the engagement can only be released using a tool. The use of a tool for releasing the engagement is mandatory because the second section of the second module unit covers the live electronic components of the first module unit in the ready-to-operate state. This ensures that live electronic components cannot be accidentally exposed. The engagement of the third engagement section with the second counter-engagement section can further comprise a locking mechanism which secures the third engagement section in a rotationally fixed position.When designing the modular lighting unit, it can be provided that the third engagement section can be moved into its locking position by rotating or twisting it in the circumferential direction of the modular lighting unit. Alternatively, another connection mechanism can be provided instead of the locking mechanism, for example, a plug-in or screw mechanism.

[0029] In a preferred embodiment of the modular lighting unit according to the invention, the first module unit can be designed in three parts, so that the first module unit comprises a circuit board, a first cover and a second cover, which can be connected to one another via a connecting mechanism, and wherein the first and the second cover at least partially overlap the circuit board in the ready-to-use state. The three-part design of the first module unit has the particular advantage that touch-sensitive elements, which can be provided on the circuit board, for example the electronic components, can be protected by the first and the second cover. The installer can thus grasp the first module unit by means of the first and the second cover when replacing or installing the modular lighting unit.

[0030] Furthermore, it can be provided that the semiconductor light sources arranged on at least one surface of the circuit board are not covered by the first and / or second cover, so as not to impair the light intensity of the semiconductor light sources. However, if the first and / or second cover does cover the semiconductor light sources, they can optionally be made of an at least partially light-transparent or translucent material. The connection mechanism, via which the circuit board engages with the two covers, can in particular be designed as at least one snap connection.

[0031] Optionally, the circuit board, the first cover, and the second cover can each have a central recess, which are arranged concentrically to one another in the ready-to-operate state. Analogous to the already described central recesses of the first and second sections of the second module unit, the central recesses of the circuit board and the two covers can have a substantially identical diameter. In the ready-to-operate state, the central recesses of the circuit board and the two covers represent, in particular, the central recess of the first module unit.

[0032] In an advantageous embodiment of the modular lighting unit according to the invention, the first module unit can comprise a web arranged in the region of the central recess. The web can in particular be designed such that it enables the first module unit to be gripped and simultaneously rotated or turned in the circumferential direction of the modular lighting unit. The web thus serves to conveniently form or release the first and second interfaces when assembling and disassembling the modular lighting unit. Furthermore, thanks to the web, the installer can grasp the first module unit with one hand, which relieves the strain, particularly when working "overhead." This also ensures that the installer does not have to grasp the first module unit in the area of ​​the touch-sensitive semiconductor light sources.Preferably, the web extends over the entire diameter of the central recess, and it can be formed, in particular, on the first cover of the first module unit. Alternatively, the web can also be connected to an edge region of the central recess on only one side and extend radially inward into the center of the central recess. Alternatively, the web can also have an interruption, so that it extends radially inward from two opposite edge regions into the center of the central recess.

[0033] Optionally, the first module unit and / or the first section of the second module unit, which in the operational state may correspond to a rear side of the modular lighting unit, may have at least one mounting section. This means that the first module unit and / or the first section may be configured, in particular, to be mounted on a wall, a ceiling, or another desired location.

[0034] Preferably, two or more mounting sections are provided for this purpose, which can be arranged evenly on a surface of the first section, so that the first module unit and / or the first section can be mounted, in particular, flatly on a wall or ceiling. The mounting section can be provided on the first module unit, in particular in the region of the web, in order to be accessible via the central recesses even in the ready-to-use state and thus enable the installation of the modular lighting unit. Furthermore, the rear side of the modular lighting unit can preferably be made at least partially from a metallic material or another material with high thermal conductivity in order to be able to efficiently dissipate the waste heat from the semiconductor light sources.

[0035] In a preferred embodiment of the modular lighting unit according to the invention, the second section of the second module unit, in the operational state, can correspond to a front side of the modular lighting unit and can be at least partially light-transparent. In particular, a region of the second section that overlaps the semiconductor light sources of the first module unit can be made of a light-transparent or translucent material, so that the second module unit is at least partially permeable to a desired light intensity generated by the semiconductor light sources. Furthermore, the second section can also have light-directing or light-conducting properties in order to generate a particularly defined light emission.

[0036] Optionally, the modular lighting unit can further comprise a third module unit, which engages with the first module unit in the ready-to-operate state. The third module unit can in particular be configured to perform a specific function that can be adjusted to a respective area of ​​application. For example, the third module unit can be designed as a smoke detector, loudspeaker, WLAN router and / or WLAN repeater and, if appropriate, have corresponding sensors and components in its interior. Furthermore, the third module unit can also have emergency lighting or targeted basic lighting ("downlight"). Consequently, the third module unit can be provided according to its desired function and can be flexibly replaced. Alternatively, the third module unit can be designed merely as a cover for the central recesses or the modular lighting unit without any further function.In such a case or optionally, the third module unit can be formed at least partially from a light-transparent or translucent material.

[0037] In a preferred embodiment of the modular lighting unit according to the invention, the third module unit can comprise a fourth engagement portion which, in the operational state, engages with a third counter-engagement portion of the first module unit in order to secure the third module unit to the first module unit, wherein the fourth engagement portion can only be brought into engagement with the third counter-engagement portion when the third engagement portion is operationally engaged with the second counter-engagement portion. Preferably, the third module unit can be designed to complement the central recesses of the first and second module units, such that the third module unit can be inserted substantially into the central recesses.

[0038] Consequently, the fourth engagement section can also be arranged on the third module unit such that, upon insertion of the third module unit into the central recesses, it can engage with the third counter-engagement section, which is provided adjacent to the central recess of the first module unit. The engagement of the fourth engagement section with the third counter-engagement section further defines a third interface. The third interface can, in particular, comprise a rotating mechanism, so that the third module unit can be moved into a locking or securing position by rotating or turning it in the circumferential direction of the modular lighting unit.In particular, it can be provided that the fourth engagement section is designed as at least one angled and / or protruding wing, and the third counter-engagement section corresponds to at least one recess complementary to the wings. Furthermore, the third module unit can comprise a mechanism configured to prevent the fourth engagement section from engaging the third counter-engagement section if the third engagement section of the second section of the second module unit is not correctly engaged with the second counter-engagement section of the first module unit. Therefore, when inserting the third module unit, an installer immediately recognizes whether the first and second module units are engaged as intended.

[0039] Alternatively, the fourth engagement portion can be designed such that its engagement with the third mating engagement portion can be released only using a tool. This can be particularly advantageous if additional safety precautions are desired for releasing the third module unit and thus for dismantling the modular lighting unit. For this purpose, a recess can be provided, for example, on a front side of the third module unit, through which an elongated tool can be inserted to actuate an unlocking mechanism.

[0040] In a preferred embodiment of the modular lighting unit according to the invention, the modular lighting unit can have a plurality of sealing elements, which are arranged in particular adjacent to the engagement sections and the counter-engagement sections. By using sealing elements, an improved sealing class of the modular lighting unit can be achieved, which can, for example, enable its use in outdoor areas. The sealing elements can therefore be arranged within the modular lighting device in such a way that the ingress of water or moisture into the modular lighting unit is suppressed. This can be achieved in particular by providing the sealing elements in the regions of the engagement sections, the counter-engagement section, running along the central recesses and / or in the transition regions between the individual modules.

[0041] In a second aspect, the object is achieved by a method for constructing the modular lighting unit according to the invention, wherein the method comprises inserting a first engagement portion of the first portion of the second module unit into a first counter-engagement portion of the first module unit, displacing the first module unit relative to the first portion or displacing the first portion relative to the first module unit in the circumferential direction of the modular lighting unit, such that the first engagement portion is displaced into a latching position defined by the first counter-engagement portion, inserting a second engagement portion of the second portion of the second module unit into the first counter-engagement portion of the first module unit, displacing the first module unit relative to the second portion or displacing the second portion relative to the first module unit in the circumferential direction of the modular lighting unit,so that the second engagement portion is arranged relative to the first engagement portion in its locking position, and comprises fixing a third engagement portion of the second portion to a second counter-engagement portion of the first module unit, so that a displacement of the first module unit relative to the second module unit or a displacement of the second module unit relative to the first module unit in the circumferential direction is prevented.

[0042] The described method allows the modular lighting unit according to the invention to be converted into the operational state. Furthermore, the method demonstrates that the assembly of the modular lighting unit can be carried out without the use of tools. This allows the installer to assemble the modular lighting unit in an extremely time-efficient and energy-saving manner. Disassembly of the modular lighting unit is carried out in particular in the reverse order of assembly, whereby the use of a tool may only be necessary to release the engagement of the third engagement section with the second counter-engagement section.

[0043] The method according to the second aspect can additionally comprise inserting a fourth engagement portion of a third module unit into a third mating engagement portion of the first module unit and displacing the first module unit relative to the third module unit or displacing the third module unit relative to the first module unit in the circumferential direction of the modular lighting unit, such that the fourth engagement portion is displaced into a securing position defined by the third mating engagement portion. Analogous to the method steps described above, the engagement of the fourth engagement portion with the third mating engagement portion can also be carried out without the use of a tool. The third module unit can be designed for dismantling the modular lighting unit in such a way that the corresponding engagement can also be released without a tool or, alternatively, only using a tool.

[0044] According to a third aspect of the invention, a modular lighting system is provided which comprises a modular lighting unit according to the invention, a first holding device which has a fourth counter-engagement section and at least one first mounting section, and a second holding device which has a fifth counter-engagement section and at least one second mounting section, wherein the third module unit is selectively engaged with the first holding device via the fourth counter-engagement section or with the second holding device via the fifth counter-engagement section.

[0045] The modular lighting system is used in particular to enable the third module unit of the modular lighting unit to be mounted directly on a wall, ceiling or any other desired location, i.e. without prior mounting of the first and second module units. This can be particularly desirable if a further third module unit is to be installed in the vicinity of an already mounted, ready-to-use modular lighting unit, for example for use as an additional smoke detector, loudspeaker, WLAN router and / or WLAN repeater. Since the third module unit can also comprise emergency lighting or targeted general lighting, it can also be used as a standalone lighting unit. This can be advantageous, for example, in small rooms or corridors where even a small-sized lighting unit can provide sufficient light intensity.The first and second mounting devices differ in particular in the arrangement of the respective mounting sections and optionally also in the design of the respective counter-engagement sections. In the first mounting device, the first mounting section can be designed analogously to the mounting section of the first section of the second module unit. This means that at least one first mounting section can be arranged on a surface of the first mounting device, wherein the first mounting section is preferably provided in the immediate vicinity of a central recess of the first mounting device and is thus covered by the third module unit in the operational state of the modular lighting system.Consequently, in a first assembly step of the modular lighting system, the first mounting device can be mounted to a wall or ceiling before, in a second step, the third module unit is engaged with the first mounting device. This arrangement ensures that manipulation of the first mounting section in the operational state, i.e., while the third module unit is engaged with the first mounting device, is impossible.

[0046] The second mounting device enables more flexible assembly and disassembly of the modular lighting system, since the at least one second mounting section can be provided on an outer side of the second mounting device, and the third module unit thus does not necessarily have to be detached from the second mounting device in order to mount or remove the second mounting device on a wall or ceiling. Furthermore, the described design of the second mounting section also enables installation of the modular lighting system in a wall or ceiling, so that it does not protrude, or only protrudes slightly, from the wall or ceiling.

[0047] The engagement of the third module unit with either the fourth counter-engagement section of the first holding device or the fifth counter-engagement section of the second holding device can be designed in particular analogous to the already described engagement of the fourth engagement section of the third module unit with the third counter-engagement section of the first module unit.

[0048] The described modular units are to be considered, in particular, as self-contained, independent units. This allows for a multitude of possible combinations of the modular units, which can preferably be based on the interfaces explained, with other modular units not yet explained in connection with the present invention. The combination or engagement of the various modular units takes place in compliance with the prescribed or statutory standards. Therefore, the present invention offers a high degree of design freedom with regard to the desired areas of application as well as the design of the modular lighting unit or modular lighting system.

[0049] The modular lighting unit according to the invention and the modular lighting system will be described in more detail below using an exemplary embodiment with reference to the accompanying drawings. It shows:

[0050] Figure 1 is an exploded view of a first module unit of a modular lighting unit according to the invention, comprising a circuit board and a first and a second cover;

[0051] Figure 2a is an exploded view of the modular lighting unit according to the invention, comprising the first module unit, a two-part second module unit and a third module unit;

[0052] Figure 2b is a perspective view of the assembled modular lighting unit according to the invention;

[0053] Figure 3 is a perspective view of the first module unit engaged with a first portion of the second module unit;

[0054] Figure 4 shows a detailed view of the state shown in Figure 3; Figure 5 shows a perspective view of the first module unit engaging with the first section of the second module unit and the second section of the second module unit;

[0055] Figure 6 is a detailed view of the state shown in Figure 5;

[0056] Figure 7 shows a detailed view of a first and a second interface;

[0057] Figure 8 shows a further detailed view of the first and second interfaces;

[0058] Figure 9 is a detailed view of a third engagement portion and a second counter-engagement portion;

[0059] Figure 10 shows a further detailed view of the third engagement section and the second counter-engagement section;

[0060] Figure 11 is a perspective view of the underside of the third module unit and the top side of the second cover of the first module unit;

[0061] Figure 12 is a sectional view of an optional embodiment of the third module unit;

[0062] Figure 13 is a perspective view of a first mounting device and a third module unit of a modular lighting system; and

[0063] Figure 14 is a perspective view of a second mounting device and the third module unit of the modular lighting system.

[0064] In the following figures, a modular lighting unit according to the invention, which is illustrated in particular in Figures 2a and 2b, is generally designated by the reference numeral 10. Figure 1 shows a three-part first module unit 12 of a modular lighting unit 10 in an exploded view. The first module unit 12 here comprises a circuit board 14, a first cover 16, and a second cover 18, all of which are annular and each have a central recess 20a, 20b, 20c. The central recesses 20a, 20b, 20c are formed with a substantially identical diameter, which can in particular be in the range of 60-120 mm, preferably in the range of 80-100 mm.

[0065] A plurality of semiconductor light sources 22, which are embodied, for example, in the form of LEDs, are arranged on a surface of the circuit board 14. The LEDs 22 are provided here, in particular, radially outward on the circuit board 14, whereby the light emitted by the LEDs 22 is only slightly affected by the remaining components of the first module unit 12. Furthermore, the LEDs 22 can be evenly distributed and arranged equidistant from one another to ensure the most homogeneous light emission possible. Furthermore, electronic components 24 are provided on the surface of the circuit board 14, which can correspond, for example, to a connection terminal designed for the power supply and to LED driver electronics.The electronic components 24 are preferably arranged close to the central recess 20a so that they can be easily reached via the central recess 20a, for example in order to be connected to external lines (not shown).

[0066] In Figure 1, the second cover 18 exemplarily comprises a raised region 26 which is configured to at least partially cover the electronic components 24 in an operational state of the modular lighting unit 10, i.e. in a state in which the module units of the modular lighting unit 10 are fully engaged or connected and the unit is functional. This can in particular prevent the voltage-carrying electronic components 24 from being touched or tampered with from the outside in the operational state. Furthermore, the second cover 18 has a web 28 which here extends over the entire diameter of the central recess 20c. The web 28 serves to grip the first module unit 12 and to turn or rotate it relative to a second module unit 30, which will be described in detail with reference to Figures 2a and 2b.The arrangement and design of the web 28 are shown here merely as an example. For example, the web 28 could also be arranged on the circuit board 14 or the first cover 16.

[0067] The circuit board 14, the first cover 16, and the second cover 18 can be engaged with one another via a snap-in or connecting mechanism 32. For this reason, the first cover 16 can have a plurality of connecting elements 32a, for example four connecting elements 32a, which, in order to engage the three modular components 14, 16, 18 of the first module unit 12, can be guided through correspondingly designed recesses 32b of the circuit board 14 into connecting element counter-engagements 32c of the second cover and can be latched or snapped into place there. The circuit board 14 and the first and second covers 16, 18 are connected to one another, in particular in a rotationally fixed manner, via the connecting mechanism 32 and, in the ready-to-use state, represent the first module unit 12.

[0068] Should the three modular components 14, 16, 18 of the first module unit 12 need to be separated from one another, for example, to replace individual electronic components 24, the connecting elements 32a of the connecting mechanism 32 can be actuated at the connecting element counter-engagements 32c to release the engagement. The connecting mechanism 32 and in particular the connecting element counter-engagements 32c are preferably designed such that accidental release of the engagement is impossible. This can be achieved, for example, by providing four connecting elements 32a, as shown in Figure 1, which must be actuated simultaneously to release the engagement.

[0069] Figure 2a shows an exploded view of a modular lighting unit 10, while Figure 2b illustrates a fully assembled modular lighting unit 10. Figure 2a particularly shows how the individual module units are arranged relative to one another. In the ready-to-use state, the first module unit 12 is arranged between a first section 34 and a second section 36 of the second module unit 30, wherein Figure 2b particularly shows that the two sections 34, 36 completely enclose the first module unit 12 and have a significantly larger diameter than the first module unit 12. The two annular sections 34, 36 each comprise a central recess 38a, 38b, which here is designed with a larger diameter than the central recess 20 of the first module unit 12.The central recesses 38a, 38b, which are arranged concentrically to the central recess 20 of the first module unit 12 in the ready-to-use state, serve in particular to guide lines to the first module unit 12 and enable the web 28 to be gripped when the first and second module units 12, 30 are engaged with one another in the ready-to-use state. Figures 2a and 2b also show that the second section 36 can completely cover the LEDs 22 of the first module unit in the ready-to-use state. Therefore, the second section 36 is preferably made at least partially of a light-transparent, translucent, and / or light-conducting material.

[0070] The first section 34 in Figure 2a comprises four first engagement elements 40 and two mounting sections 42. Since the first section 34, according to the illustrated embodiment, corresponds to a rear side of the modular lighting unit 10, the modular lighting unit 10 can be mounted flat on a wall or ceiling by means of the two mounting sections 42. Such mounting sections 42 can additionally or alternatively also be provided on the first module unit 12. In particular, at least one mounting section 42 can be formed in the region of the web 28 or on the web 28, so that the modular lighting unit 10 can also be mounted on a wall or ceiling by means of the first module unit 12.This makes it possible to assemble the modular lighting unit 10 even in the fully assembled state, since assembly sections 42, which are arranged in the region of the web 28, are easily accessible via the central recesses 20a, 20b, 20c of the first module unit 12 and the central recesses 38a, 38b of the second module unit 30, even in the ready-to-use state.

[0071] The four first engagement elements 40, which here are exemplified as M5x8 flat-head screws standardized according to DIN 932, define a first engagement section 44. The first engagement elements 40 of the first engagement section 44 form part of a first interface 46 (not shown), which is defined by the engagement of the first module unit 12 with the first section 34, and are preferably evenly distributed along the circumferential direction of the modular lighting unit 10 around the central recess 38a. The design of the first interface 46 will be described in more detail below with reference to Figures 3 and 4.

[0072] Furthermore, the modular lighting unit 10 in Figures 2a and 2b comprises a third module unit 48, which is also referred to as a functional module and can, for example, be designed in two parts in order to enable the components in the interior of the third module unit 48 to be replaced. The third module unit 48 functions, for example, as a smoke detector, loudspeaker, WLAN router and / or WLAN repeater and, for this purpose, has corresponding sensors and electronic components (not shown) in an interior space. The third module unit 48 can comprise an electrical contact in order to be supplied with power, for example, from the first module unit 12 or externally. Alternatively, the third module unit 48 can also be battery-operated. Furthermore, it can be seen from Figures 2a and 2b that the third module unit 48 can be arranged centrally in the modular lighting unit 10.For this purpose, the third module unit 48 is guided into the central recess 38b of the second section 36 of the second module unit 30 and engaged with the first module unit 12 by turning or rotating. This engagement is described in detail with reference to Figure 11.

[0073] Figures 3 and 4 illustrate the engagement of the first engagement portion 44 of the first section 34 of the second module unit 30 with a first counter-engagement portion 50 of the first module unit 12. Figure 3 shows a perspective view of the first and second module units 12, 30, while Figure 4 corresponds to a detailed view of the state shown in Figure 3. The first module unit 12 here has elongated recesses 52 which follow the circumferential direction of the modular lighting unit 10. The elongated recesses 52 represent, in particular, a region complementary to the first engagement elements 40. A first end region 54 of a respective elongated recess 52 is configured to receive a first engagement element 40 of the first section 34, wherein for this purpose it is formed with a diameter that is larger than the remaining region of the elongated recess 52.If the first engagement element 40 is now displaced from the first end region 54 along a partial region 56 of the elongated recess 52 to a second end region 58, for example by turning or rotating the web 28 and thus the first module unit 12 relative to the first section 34, the first engagement element 40 is transferred into a locking position. As can be seen in the detailed view of Figure 4, the locking position is defined in particular by the second end region 58 and thus forms the first interface 46. As soon as the first engagement element 40 is in its locking position, a locking mechanism 60 prevents the engagement element from being released or moved back toward the first end region 54.

[0074] The first interface 46 is only fully and correctly formed when the first engagement element 40 is secured in the latching position. This results in the first module unit 12 being rotationally fixedly engaged with the first section 34 of the second module unit 30. By reaching the latching position and latching into it, the installer recognizes both visually and acoustically that the first interface 46 has been correctly formed. To release the first interface 46, the latching mechanism 60 can be actuated manually, for example by moving a correspondingly coupled operating element 62. This releases the first engagement element 40 from its latching position in the second end region 58 and can be displaced in the direction of the first end region 54 by turning or rotating the first module unit 12 in the circumferential direction of the modular lighting unit 10. At this point it should be mentioned that the turning or rotatingRotating the first module unit 12 to release the first interface 46 is preferably carried out in the opposite direction with respect to the formation of the first interface 46.

[0075] Figures 5 and 6 now illustrate a second engagement section 64 of the second section 36 of the second module unit 30, wherein Figure 5 shows a perspective rear view of the first module unit 12 in engagement with the first section 34 and the unconnected second section 36, and Figure 6 corresponds to a detailed view. The second section 36 comprises a curved or angled section 66, which is designed in particular to at least partially receive the second cover 18 of the first module unit 12 in its interior, i.e. in the central recess 38b of the second section 36. At a lower edge 68 of the angled section 66, the second section 36 comprises a plurality of second engagement elements 70, which here are exemplary in the form of four projecting wings and define the second engagement section 64.The second engagement elements 70 are preferably evenly distributed along the circumferential direction of the modular lighting unit 10 at the lower edge 68.

[0076] If the second section 36 is now placed onto the first module unit 12, the second engagement elements 70 are able to at least partially engage with the partial area 56 of the first counter-engagement section 50. However, this is only possible if the first interface 46 was previously formed correctly, i.e. if the first engagement elements 40 of the first engagement section 44 are in their respective locking position in the second end area 58. As long as a first engagement element 40 is located in the partial area 56, for example because it has not been fully moved into the corresponding locking position, the first engagement element 40 blocks the insertion of the second engagement section 64 into the partial area 56 of the first counter-engagement section 50. The installer can therefore immediately recognize upon insertion of the second engagement elements 70 into the partial area 56 whether the first interface 46 was previously formed correctly.The described arrangement therefore prevents the installer from accidentally installing the modular lighting unit 10 incorrectly.

[0077] Provided the first interface 46 has been correctly formed, the second engagement elements 70 can be displaced by turning or rotating in the circumferential direction of the modular lighting unit 10 into a receptacle 72 of the first counter-engagement section 50, which represents a second complementary area. This process is illustrated in the detailed views of Figures 7 and 8, wherein only the second engagement elements 70 of the second section 36 are shown here and the remaining part of the second section 36 has been cut off for illustrative purposes. In particular, it is also apparent from Figure 8 that the direction of rotation for displacing the second engagement element 70 into the receptacle 72 can be designed opposite to the direction of rotation for displacing the first engagement element 40 into its latching position.The engagement of the second engagement element 70 with the receptacle 72 defines, in particular, a second interface 74. When the second interface 74 is formed, the second section 36 is secured to the first module unit 12 and completely encloses it together with the first section 34. Furthermore, the formed second interface 74 also prevents complete detachment of the first interface 46, since the second engagement elements 70 can at least partially overlap the first end region 54 of the first counter-engagement section 50 in the operational state.

[0078] Figures 9 and 10 also show a further locking mechanism, each in a detailed view, which serves to rotationally secure the second section 36 of the second module unit 30 to the first module unit 12. For this purpose, a slide element 76, which is also shown in Figure 5 and defines a third engagement section, is formed on a side of the angled section 66 facing the central recess 38b of the second section 36. The slide element 76 here has a rounded recess 78, which is arranged in a central region of the slide element 76. Complementary to the slide element 76, a rocker arrangement 80 is formed on an upper side of the first module unit 12 or on an upper side of the second cover 18 of the first module unit 12, which defines a second counter-engagement section. The rocker arrangement 80 comprises a locking device 82 and a counter-engagement element 84.

[0079] If the second section 36 is now placed on the first module unit 12 to form the second interface 74, the third engagement section or the slide element 76 also engages with the second counter-engagement section or the rocker arrangement 80. In a first step, the slide element 76 actuates the rocker arrangement 80 such that the locking device 82 is moved into an exposed position and the counter-engagement element 84 is simultaneously moved into a retracted position. This first step or state is shown in particular in Figure 9. If the second section of the second module unit is now moved into the end position by twisting, the installer can recognize acoustically and visually from the now no longer exposed locking device 82 that the third engagement section 76 is fully engaged with the second counter-engagement section 80.Since the further locking mechanism shown in Figures 9 and 10 is preferably designed such that it is carried out synchronously or parallel to the engagement of the second interface 74, the installer can conclude from the state shown in Figure 9 that the second interface 74 is also fully formed.

[0080] By rotating the first module unit 12 relative to the second section 36, for example, by rotating the web 28 in the circumferential direction of the modular lighting unit 10, the slide element 76 can be displaced in a second step toward the counter-engagement element 84 of the rocker assembly 80. As soon as the rounded recess 78 of the slide element 76 is located above the counter-engagement element 84, the latter can, for example, due to a restoring force of the rocker assembly 80, protrude from its retracted position and engage with the rounded recess 78, with the locking device 82 simultaneously and audibly displaced from its exposed position to the starting position. This state is illustrated in particular in Figure 10.In the ready-to-operate state, the second section 36 can thus be secured rotationally fixed to the first module unit 12 due to the engagement of the third engagement section 76 with the second counter-engagement section 80. To release the engagement of the third engagement section 76 with the second counter-engagement section 80, the counter-engagement element 84 must be moved from its latching position in the rounded recess 78 into the retracted position; this process can be carried out using a tool. The third engagement section 76 can then be moved counter to the original direction of rotation to achieve the state shown in Figure 9. Parallel to this process, the engagement of the second interface 74 is also released, whereby the second section 36 can be removed from the first module unit 12.

[0081] Figure 11 shows a perspective view of the second cover 18 of the first module unit 12 and an underside of the third module unit 48. This particularly shows that, in addition to the first and second counter-engagement sections 50, 80, a third counter-engagement section 86, which is designed in the form of a plurality of receptacles, can be provided on the second cover 18. The receptacles of the third counter-engagement section 86 are arranged in particular on an inner side of the raised region 26 of the second cover 18 and face the central recess 20c. Figure 11 shows, by way of example, four recesses of the third counter-engagement section 86, wherein the recesses have two partial regions 88, 90.The first partial region 88 can be wider and deeper than the second partial region 90, so that a complementary fourth engagement section 92, which is provided on the underside of the third module unit 48, can be inserted into the first partial region 88, but not directly into the second partial region 90.

[0082] By rotating or turning the fourth engagement section 92 located in the first sub-area 88, which is preferably designed in the form of a plurality of protruding wings 94, in the circumferential direction of the modular lighting unit 10, the protruding wings 94 can now be displaced into the respective second sub-area 90. The second sub-area is designed such that the third module unit 48 is secured to the second cover 18 of the first module unit 12 by the engagement of the fourth engagement section 92 with the third counter-engagement section 86, thus forming a third interface. Furthermore, the third module unit 48 can be configured such that the upper side of the third module unit 48, in the ready-to-operate state, lies substantially in a plane with the upper side of the second section 36 of the second module unit 30. This state is illustrated in particular in Figure 2b.

[0083] Consequently, however, when dismantling the modular lighting unit 10, the installer has no starting point from which to grasp the third module unit 48 to release it from the second section 36. Therefore, a plurality of ejection elements 96 can be arranged on the underside of the third module unit 48, which ejection elements 96, when the modular lighting unit 10 is in the operational state, are accommodated in recesses 98 provided for this purpose in the raised area 26. If the protruding wings 94 of the fourth engagement area 92 are now displaced from the second sub-area 90 to the first sub-area 88 by turning or rotating the third module unit 48 in the circumferential direction of the modular lighting unit 10, the ejection elements 96 are displaced from their recesses 98.Due to a restoring force of the ejection elements 96, these push the third module unit 48 upwards a few mm and thus beyond the top side of the second section 36, whereby the installer can grasp the third module unit 48 and remove it from the modular lighting unit 10.

[0084] Furthermore, further recesses 100 can be provided on the underside of the third module unit 48, which are designed to prevent the engagement of the fourth engagement section 92 with the third counter-engagement section 86 when the locking device 82 is in the exposed position shown in Figure 9. During the turning or rotating of the third module unit 48 in the circumferential direction of the modular lighting unit 10, one of the recesses 100 comes into contact with the exposed locking device 82 by means of one of the transverse edges of the recess 100, thereby blocking the turning or rotation of the third module unit 48. The installer thus immediately recognizes that the third engagement section 76 of the second section 36 is not fully engaged with the second counter-engagement section 80 of the first module unit 12.

[0085] If it is also preferred that the third module unit 48 can only be removed from the modular lighting unit 10 using a tool, it is optionally possible to provide a release mechanism 102 on the third module unit 48. This release mechanism 102 is shown in both Figure 11 and Figure 12. In Figure 11, on the underside of the third module unit 48, at the position of one of the ejection elements 96, a further rocker arrangement 104 is arranged, which includes a protruding locking element 106. If the modular lighting unit 10, including the third module unit 48, is in the operational state, the locking element engages in one of the recesses 98 of the second cover 18 and thus blocks the turning or rotation of the third module unit 48 for dismantling the modular lighting unit 10.

[0086] Figure 12 now illustrates the unlocking mechanism 102 in the interior of the third module unit 48. An elongated tool can be inserted through a hole 108 on the top side of the third module unit 48, which actuates an unlocking element 110 of the unlocking mechanism 102 from above, whereby the locking element 106, which is coupled to the unlocking element 110, is displaced from its locking position and thus enables the turning or rotating of the third module unit 48 in the circumferential direction of the modular lighting unit 10. As an alternative to the unlocking mechanism 102, a screw can also be provided, which can engage the first module unit 12 from the top side of the third module unit 48 (not shown).

[0087] In summary, it should be noted at this point that due to the described design and arrangement of the engagement sections 44, 64, 76, 92 and the associated counter-engagement sections 50, 80, 86, incorrect assembly of the modular lighting unit 10 is ruled out. The installer can therefore be confident that, with a fully assembled modular lighting unit 10, all participating module units 12, 30, 48 are correctly engaged with one another. Furthermore, the module units 12, 30, 48 can be engaged without the use of a tool, but simply by turning or rotating them in the circumferential direction of the modular lighting unit 10. For the disassembly of the modular lighting unit 10, the proper use of a tool is only necessary to release the engagement of the third engagement section 76 with the second counter-engagement section 80, since this is to protect against live electronic components 24.Furthermore, the use of a tool can also be optionally provided for releasing the engagement of the fourth engagement portion 92 with the third counter-engagement portion 86.

[0088] Figures 13 and 14 each show a perspective view of a modular lighting system 120, which has a third module unit 48 and a specific mounting device 122, 124 provided therefor. The first mounting device 122 comprises at least one first mounting section 126, which can be designed analogously to the mounting section 42 of the first section 34 of the second module unit 30, i.e., can be provided adjacent to a central recess 128a of the first mounting device 122. Optionally, the first mounting section 126 can also protrude into the central recess 128a, as illustrated in Figure 13. The second mounting device 124 shown in Figure 14 comprises at least one second mounting section 130, which is provided on an outer side of the second mounting device 124.Thus, the second mounting device 124 can, for example, be embedded in a wall or a ceiling and mounted thereon via the lateral second mounting section 130.

[0089] The central recesses 128a, 128b of the two mounting devices 122, 124 serve in particular to supply power to the third module unit 48, which in this regard can comprise an electrical contact 132 shown by way of example in Figure 11. Furthermore, the engagement of the third module unit 48 with the first or second mounting device 122, 124 can be designed analogously to the fourth engagement section 92 described with reference to Figure 11, with the third counter-engagement section 86 of the first module unit 12 as well as the ejection elements 96 and the unlocking mechanism 102. Accordingly, the first mounting device 122 can comprise a corresponding fourth counter-engagement section 134, and the second mounting device 124 can comprise a corresponding fifth counter-engagement section 136.Alternatively or additionally, the second mounting portion 130 can also be coupled to the fifth counter-engagement portion 136 via a connecting mechanism (not shown), so that upon actuation or displacement of the second mounting portion 130, the release of the engagement from the fourth engagement portion 92 with the fifth counter-engagement portion 136 is made possible.

Claims

Claims 1. Modular lighting unit (10) comprising at least two module units (12, 30): - a first module unit (12) which is ring-shaped and has a central recess (20), wherein at least one semiconductor light source (22) and at least one electronic component (24) is arranged on a surface of the first module unit (12); and - a second module unit (30) which is designed in two parts, such that the second module unit (30) has a first section (34) and a second section (36) which are arranged to each other in an operational state such that they enclose the first module unit (12), wherein the first section (34) and the second section (36) each have a central recess (38a, 38b) which is concentric to the central recess (20) of the first module unit (12) in the operational state, characterized in that the first section (34) comprises a first engagement section (44) which, in the operational state, engages with a first counter-engagement section (50) of the first module unit (12) in order to secure the first section (34) to the first module unit (12), and the second section (36) comprises a second engagement section (64),which in the operational state is engaged with the first counter-interaction section (50), so that the first section (34) and the first module unit (12) cannot be separated from each other.

2. Modular lighting unit (10) according to claim 1, wherein the second engagement section (64) engages in the first counter-engagement section (50) in the operational state to secure the second section (36) to the first module unit (12).

3. Modular lighting unit (10) according to one of the preceding claims, wherein the first engagement section (44) comprises a plurality of first engagement elements (40) comprises which are arranged on a surface of the first section (34) of the second module unit (30), and wherein each first engagement element (40) in the operational state engages with a first complementary area (52) of the first counter-engagement section (50).

4. Modular lighting unit (10) according to one of the preceding claims, wherein the second engagement section (64) comprises a plurality of second engagement elements (70) which are arranged on a surface of the second section (36) of the second module unit (30), and wherein each second engagement element (70) engages with a second complementary area (72) of the first counter-engagement section (50) in the operational state.

5. Modular lighting unit (10) according to one of the preceding claims, wherein the second section (36) further comprises a third engagement section (76) which, in the operational state, engages with a second counter-engagement section (80) of the first module unit (12) to connect the second section (36) to the first module unit (12) in a rotationally fixed manner, wherein the engagement can only be released using a tool.

6. Modular lighting unit (10) according to one of the preceding claims, wherein the first module unit (12) is designed in three parts, such that the first module unit (12) comprises a circuit board (14), a first cover (16) and a second cover (18) which can be connected to each other via a connection mechanism (32), and wherein the first cover (16) and the second cover (18) at least partially overlap the circuit board (14) in the ready-to-use state, wherein the circuit board (14), the first cover (16) and the second cover (18) preferably each have a central recess (20a, 20b, 20c) which are arranged concentrically to each other in the ready-to-use state.

7. Modular lighting unit (10) according to one of the preceding claims, wherein the first module unit (12) comprises a continuous or interrupted web (28) which is arranged in the area of ​​the central recess (20).

8. Modular lighting unit (10) according to one of the preceding claims, wherein the first module unit (12) and / or the first section (34) of the second module unit (30), which in the operational state corresponds to a rear side of the modular lighting unit (10), has / has at least one mounting section (42), and / or wherein the second section (36) of the second module unit (30) corresponds in the operational state to a front side of the modular lighting unit (10) and is at least partially light-transparent.

9. Modular lighting unit (10) according to one of the preceding claims, further comprising a third module unit (48) which engages with the first module unit (12) in the ready-to-use state.

10. Modular lighting unit (10) according to claim 5 and claim 9, wherein the third module unit (48) comprises a fourth engagement section (92) which, in the operational state, engages with a third counter-engagement section (86) of the first module unit (12) to secure the third module unit (48) to the first module unit (12), wherein the fourth engagement section (92) can only engage with the third counter-engagement section (86) when the third engagement section (76) is operationally engaged with the second counter-engagement section (80).

11. Modular lighting unit (10) according to claim 10, wherein the fourth engagement section (92) is designed such that its engagement with the third counter-engagement section (86) can only be released using a tool.

12. Modular lighting unit (10) according to claim 10, wherein the modular lighting unit (10) has a plurality of sealing elements, which are arranged in particular adjacent to the engagement sections (44, 64, 76, 92) and the counter-engagement sections (50, 80, 86, 134, 136).

13. Method for constructing a modular lighting unit (10) according to the preamble of claim 1, comprising the following steps: - Inserting a first engagement section (44) of the first section (34) of the second module unit (30) into a first counter-engagement section (50) of the first module unit (12); - Displacing the first module unit (12) relative to the first section (34) or displacing the first section (34) relative to the first module unit (12) in the circumferential direction of the modular lighting unit (10), so that the first engagement section (44) is displaced into a detent position (58) which is defined by the first counter-engagement section (50); - Inserting a second engagement section (64) of the second section (36) of the second module unit (30) into the first counter-engagement section (50) of the first module unit (12); - Displacing the first module unit (12) relative to the second section (36) or displacing the second section (36) relative to the first module unit (12) in the circumferential direction of the modular lighting unit (10), such that the second engagement section (64) is arranged relative to the first engagement section (44) in its detent position (58); and - Fixing a third engagement section (76) of the second section (76) to a second counter-engagement section (80) of the first module unit (12) so that displacement of the first module unit (12) relative to the second module unit (30) or displacement of the second module unit (30) relative to the first module unit (12) in the circumferential direction is prevented.

14. The method of claim 13, further comprising the following steps: - Inserting a fourth engagement section (92) of a third module unit (48) into a third counter-engagement section (86) of the first module unit (12); and - Displacing the first module unit (12) relative to the third module unit (48) or displacing the third module unit (48) relative to the first module unit (12) in the circumferential direction of the modular lighting unit (10), so that the fourth engagement section (92) is displaced into a locking position defined by the third counter-engagement section (86).

15. Modular lighting system (120), comprising: - a modular lighting unit (10) according to one of claims 9 to 12; - a first holding device (122) comprising a fourth counter-engagement section (134) and at least one first assembly section (126); and - a second mounting device (124) which has a fifth counter-engagement section (136) and at least a second mounting section (130), characterized in that the third module unit (48) engages either via the fourth counter-engagement section (134) with the first mounting device (122) or via the fifth counter-engagement section (136) with the second mounting device (124).

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