Illuminated seat belt buckle for a seat belt device of a motor vehicle

Abstract

The invention relates to an illuminated seat belt buckle (1) for a seat belt device of a motor vehicle, comprising - a housing (2), - a push button (3) which can be moved in the housing (2), - an insert slot (4) for inserting a belt tongue which can be locked in the seat belt buckle (1), - at least one annular light source (5) which surrounds the insert slot (4) and the push button (3), and - a cover element (6) which covers the annular light source (5) towards the radial outer face and the end face of the seat belt buckle (1), wherein - the light source (5) is made of a plurality of individual light sources (22) which can be actuated independently of one another.

Description

[0001] Illuminated belt buckle for a safety belt device of a motor vehicle

[0002] The present invention relates to an illuminated belt buckle for a safety belt device of a motor vehicle having the features of the preamble of claim 1.

[0003] Belt buckles for motor vehicle safety belt systems are generally used to securely lock a belt tongue that is guided slidably along a belt webbing or is permanently attached to one end of the webbing. For this purpose, the belt buckle has an insertion slot for the belt tongue and a locking mechanism that can be released via a push button. The locking mechanism is spring-loaded and automatically locks the belt tongue when inserted into the insertion slot. To release the belt tongue, a passenger wearing the seat belt presses the push button, which releases the locking mechanism and ejects the belt tongue due to the released spring force of the locking mechanism.

[0004] Such belt buckles have been state-of-the-art for many years. One problem with such buckles is that the occupant has to find the relatively narrow slot in the buckle, into which they insert the tongue to fasten the seat belt.

[0005] DE 39 04 125 A1 discloses a belt buckle with a light source, wherein the light source is coupled to predetermined light-emitting surfaces of the belt buckle via a light-conducting material. The light-emitting surfaces here are the push button itself and / or a light-emitting surface arranged on a side surface of the insertion slot opposite the push button. Since the push button must be designed to be movable in order to function, the light-conducting material fixedly arranged in the push button must be positioned in the push button such that the light entry surface of the light-conducting material is optically connected to the external light source when the push button is not pressed.If the light entry surface of the light-conducting material is not connected to the external light source in this position due to manufacturing-related shape and position deviations or mechanical influences, the light is not or not completely introduced into the push button, so that the push button itself does not light up or lights up less brightly than would be desired.

[0006] From DE 10 2007 047 704 A1, it is also known to provide a light guide in the belt buckle, which light guide has at least two light-emitting surfaces arranged at the ends of the insertion slot. The light-emitting surfaces themselves are triangular in shape and arranged in a free triangular area of ​​the front side of the housing between the edge of the housing and a conical side surface of the push button. In particular, the light-emitting surfaces are dimensioned such that they fill the free areas in the corners of the front side of the housing as extensively as possible to achieve the greatest possible luminosity.

[0007] US Pat. No. 5,892,436 A discloses an illuminated belt buckle in which a light source is connected via a plurality of optical fibers. The optical fibers exit from an end face of the housing, thus forming a plurality of illuminated points arranged circumferentially around the push button of the belt buckle or around the insertion slot. However, this solution is complex and expensive. Furthermore, the optical fibers are positioned in the direction of movement of the push button, so there is a risk of damage to the optical fibers when the push button is pressed to open the belt buckle.

[0008] From the publication DE 10 2015 215 254 B4, an illuminated belt buckle is known in which the light-emitting surface is formed by a circumferential surface light source on the front side of the housing, wherein the surface light source is designed as a luminous thin-film component. A ring element is additionally provided on the front side of the housing, which covers the surface light source from the front side of the belt buckle and from the radial outer side of the belt buckle, thereby protecting it from damage. The ring element is manufactured using a two-component injection molding process and has a translucent area on the front side in the form of a continuous circumferential band and an opaque area on its radial outer side, so that the belt buckle is deliberately illuminated only on the front side.

[0009] The object of the invention is to provide a cost-effective belt buckle of the generic type with improved lighting.

[0010] To achieve this object, an illuminated belt buckle having the features of claim 1 is proposed. Further preferred embodiments of the invention can be found in the dependent claims, the figures, and the associated description.

[0011] According to claim 1, an illuminated belt buckle for a safety belt device of a motor vehicle is proposed, comprising a housing, a push button which can be moved in the housing, an insertion slot for inserting a belt tongue which can be locked in the belt buckle, and at least one annular light source which comprises the insertion slot and the push button, and a cover element which covers the annular light source towards the radial outside and the front side of the belt buckle, in which the light source is formed by a plurality of individually controllable light sources.

[0012] The advantage of the proposed solution is that the large number of independently controllable individual light sources allows for individually different illumination of the belt buckle depending on how the individual light sources are controlled. This allows for different lighting patterns, lighting frequencies, or even dynamic lighting, e.g., in the form of a running light. The individual lighting can be implemented differently both according to aesthetic aspects and depending on the belt fastening status, seat occupancy status in the vehicle, driving conditions, or accident scenarios. Furthermore, the proposed solution offers the advantage of redundancy: in the event of a failure of individual light sources, the illumination of the belt buckle is provided by the still-functional individual light sources.

[0013] The individualized illumination of the belt buckle can be further improved by having individual light sources emit light with different light intensities and / or colors. This can be achieved, for example, by having at least two of the individual light sources emit light with different light intensities and / or colors, or by controlling the individual light sources themselves to emit light with different light intensities and / or colors. In this way, different and / or changing color patterns for the illumination of the belt buckle can be realized. The individual light sources can be designed such that they emit light with different light intensities and / or colors, wherein the light intensity and / or color of the light emitted by the individual light sources remains constant.Alternatively, the individual light sources can also be designed so that they can emit light with different light intensities and / or colors depending on their control. The design of the light intensities of the individual light sources can enable different illumination of the cover element, which, taking into account the locally varying light transmittance of the cover element, can be used to further improve homogeneous illumination of the belt buckle.

[0014] It is further proposed that the individual light sources be connected to each other by a carrier material to form the ring-shaped light source. The carrier material connects the individual light sources together and allows them to be assembled together in a single insertion process. The carrier material thus forms the mechanical connection between the individual light sources.

[0015] In this case, an electrical conductor structure can preferably be provided in the carrier material, to which the individual light sources are electrically connected. The conductor structure in the carrier material provides electrical contact between the individual light sources, with the conductor structure itself being mechanically supported or embedded in the carrier material.

[0016] It is further proposed that the individual light sources share a central, shared power supply. This would ensure that the individual light sources are powered via a single electrical contact, which must be established during assembly of the belt buckle. This contact can be implemented as a plug-in contact or through a soldered joint.

[0017] It is further proposed that a LIN controller be provided to control the individual light sources. LIN controllers are very cost-effective to produce in large quantities and enable a very simple circuit structure for controlling the individual light sources.

[0018] It is further proposed that the individual light sources be formed by OLED segments or LEDs. OLED segments and LEDs offer the advantage of excellent controllability combined with a very long service life. Furthermore, OLED segments and LEDs can be mass-produced very cost-effectively and affixed to the substrate.

[0019] It is further proposed that the cover element have varying degrees of light transmittance. Due to the varying degrees of light transmittance of the cover element, the radiation characteristics of the illuminated belt buckle can be varied independently of the light intensity and color of the light emitted by the individual light sources, by having the cover element have higher light transmittance in certain zones or sections and lower light transmittance in certain zones or sections. The sections of varying degrees of light transmittance can be designed such that the light transmittance of the cover element changes gradually or continuously at the transition between the sections.

[0020] Particularly homogeneous optical illumination of the belt buckle can be achieved by having a cover element with lower light transmittance in the sections covering the individual light sources than in the sections covering the sections between the individual light sources. The proposed design of the cover element's light transmittance compensates for the different light intensities of the light source caused by the individual light sources, resulting in homogeneous light emission. The uneven distribution of the light intensity of the emitted light from the light source is caused by the fact that the individual light sources emit light locally with a high light intensity, while the light intensity of the light source is lower in the sections between the individual light sources.

[0021] It is further proposed that the cover element be formed in one piece from a translucent material. The proposed solution has the advantage that the light is radiated via the cover element both toward the front of the belt buckle and radially toward the outside, whereby this is made possible solely by the one-piece design of the cover element and its translucent construction. This makes the proposed solution particularly cost-effective while simultaneously improving the illumination of the belt buckle.

[0022] It is further proposed that the cover element have a one-piece mounting lug, with which it is attached to the housing of the belt buckle. This also makes the attachment of the cover element and the associated assembly process particularly simple and cost-effective. For attaching the cover element, a corresponding mounting surface is provided on the housing of the belt buckle, which allows the cover element to be attached via its mounting lug.

[0023] It is further proposed that the mounting attachment feature a locking hook that locks it to an undercut of the housing. This locking mechanism is advantageous because it can be implemented very easily during assembly and does not require any additional fasteners.

[0024] It is further proposed that the housing have a closed ring section enclosing the insertion slot and the push button, which delimits an annular cavity towards the radial inside, wherein the annular cavity is delimited towards the radial outside and towards the front of the belt buckle by the cover element, and the light source is arranged in the annular cavity. The cover element thus encloses a cavity to the housing in which the light source is arranged. Since the cover element is translucent, while the housing of the belt buckle is otherwise opaque, this ensures that all of the light emitted by the light source escapes exclusively through the cover element to the outside. The illumination of the belt buckle is thus defined exclusively by the cover element.In order to achieve high-quality optical illumination of the belt buckle, the shape of the cover element and its translucent properties can be specifically designed.

[0025] It is proposed that the cover element preferably rests against the ring section of the housing in the area of ​​the front side of the belt buckle, so that further parts are not required to form the cavity.

[0026] It is further proposed that the annular portion protrude from a base surface of the housing, and that the cover element rests radially outwardly against a portion of the housing forming the base surface. The cavity is thus formed by the cover element, the annular portion, and the base surface, wherein the annular portion and the base surface are part of the housing and form the inner wall of the cavity, and the cover element covers the cavity toward the outside.

[0027] It is further proposed that the light source be ring-shaped and arranged on the base surface radially outward relative to the ring section of the housing. The proposed ring-shaped design of the light source and its arrangement on the base surface allow the cavity and thus the cover element to be illuminated particularly evenly.

[0028] It is further proposed that the cover element have an integrally formed light-guiding section which has a light entry surface arranged parallel to and opposite a light-emitting surface of the light source. Due to the integrally formed light-guiding section with the proposed arrangement of its light entry surface, the light emitted by the light source is coupled into the cover element with improved efficiency, wherein the light guide specifically establishes a light-guiding connection from the light entry surface to the radially outer emission surface of the cover element. It is further proposed that a gap be provided between the integrally formed light-guiding section and a radially outer edge of the cover element. Due to the gap, the cover element can execute slight spring movements with its outer edge relative to the light-guiding section, which can be used to fasten the cover element during assembly.This is particularly advantageous because the light guide section essentially stiffens the cover element due to its volume, which is compensated by the spring elasticity of the edge of the cover element created by the gap.

[0029] It is further proposed that the light source be formed by an annular light guide with a light exit surface, which is located on the radial outer side of the ring section. The annular light guide, with its light exit surface, forms a light source, with the light exit geometry being defined by the light exit surface created thereon. To feed the light, the light guide itself is connected to an external light source, which can be arranged either in the housing of the belt buckle or in the cavity, or at any external location where the light is coupled into the light guide.

[0030] The light guide is preferably partially circular in cross-section, with the light emerging from the light guide both toward the radial outer side of the belt buckle and toward the front of the belt buckle. This illuminates the cavity between the cover element and the ring section, or the cover element, radially outward and toward the front of the belt buckle.

[0031] It is further proposed that the cover element be arranged without contact with the light source. The contactless arrangement of the light source with the cover element prevents the light source from being subjected to mechanical stress during the fastening of the cover element. Furthermore, the contactless arrangement of the cover element is advantageous for homogeneous illumination of the cover element, since the light emitted by the light source is additionally distributed before entering the cover element. The invention is explained below using preferred embodiments with reference to the attached figures.

[0032] Fig. 1 shows a belt buckle according to the invention according to a first embodiment; and

[0033] Fig. 2 shows the belt buckle according to the invention of Fig. 1 in a preferred further development; and

[0034] Fig. 3 shows the belt buckle according to the invention of Fig. 1 with a cover element of different thicknesses; and

[0035] Fig. 4 shows a belt buckle according to the invention with a cover element with an integrated light guide according to a second embodiment; and

[0036] Fig. 5 shows a belt buckle according to the invention with a light source with a plurality of individual light sources; and

[0037] Fig. 6 shows a section of a light source with a plurality of individual light sources in an enlarged view.

[0038] Figure 1 shows an illuminated belt buckle 1 according to the invention, comprising a housing 2, a push button 3 arranged on the front side, and an insertion slot 4 arranged adjacent thereto for inserting and locking a belt tongue (not shown) of a safety belt device. A locking mechanism (not shown) for locking the belt tongue is provided in the housing 2. This locking mechanism can be released by actuating the push button 3 to eject the belt tongue in the manner described.

[0039] On the front side of the housing 2, an annular section 8 is provided which protrudes from a base surface 10 of the housing 2 and encloses the push button 3 and the insertion slot 4 of the belt buckle 1. The base surface 10 of the housing 2 is also annular and extends over the entire circumference of the housing 2 on the radial outer side of the annular section 8. Furthermore, a cover element 6, which is also annular, is provided, which is fastened to the outside of the housing 2 in the section forming the base surface 10 via a fastening projection 7. To fasten the cover element 6, it can, for example, be glued or welded to the fastening projection 7 on the outside of the housing 2.

[0040] The cover element 6 extends from the fastening projection 7 in a first section 20 extending in the direction of the front side of the housing and continues from the first section 20 via a curved section into a second section 19 which is directed on the front side of the housing 2 in the direction of the annular section 8. The cover element 6 rests with the fastening projection 7 radially outwardly on the housing 2 and with the front side of the second section 19 on the annular section 8. The cover element 6 thus encloses an annular cavity 9 which is delimited on the radial inside by the annular section 8 and on the underside by the base area 10. An annular light source 5 is arranged on the base area 10 of the cavity 9. Suitable light sources 5 can be surface light sources, LED chains or even light guides with corresponding light exit surfaces.

[0041] The cover element 6 is formed in one piece from a translucent material. Upon activation of the light source 5, the cavity 9 is completely illuminated, with the light emerging to the outside through the first section 20, the second section 19, and the curved section of the cover element 6 arranged therebetween due to the one-piece, translucent design of the cover element 6. The belt buckle 1 is thus homogeneously illuminated in a ring shape over the entire outer surface of the first section 20, the second section 19, and the curved section of the cover element 6, with the push button 3 and the insertion slot 4 arranged within the illuminated ring.Since the cover element 6 with the fastening projection 7 rests on the outside of the housing 2 and with the second section 19 rests flatly and, as far as possible and within the scope of possible manufacturing accuracy, without a gap on the ring section 8, the light emerges exclusively via the outer surface of the cover element 6, so that optically high-quality illumination of the belt buckle 1 can be realized. The radiation characteristics can be changed depending on the customer's requirements by deliberately roughening the cover element 6, for example by etching the surface or by a specific embossed surface structure on its radial outer side or also on its radial inner side in the sense of increased scattering of the light.It is also conceivable to provide a partially transparent coating of the cover element 6, which allows the light to escape when the light source 5 is activated, but prevents a view through the cover element 6 when the light source 5 is deactivated.

[0042] Fig. 2 shows a further developed embodiment of the exemplary embodiment in Fig. 1. The fastening projection 7 is formed here by a locking arm which locks into a groove 17 of the housing 2 for fastening the cover element 6. The locking arm and / or the groove 17 can be formed over the entire circumference of the housing 2 or the cover element 6 or only sectionally in the form of several locking arms and several spaced-apart grooves 17. Furthermore, the cover element 6 is deliberately provided with a section 18 in the region of the first section 20, in which additional customer logos or information symbols of another type can be provided.

[0043] Fig. 3 shows a further development of the embodiment of Fig. 1, in which the cover element 6 can have different thicknesses in the region of the second section 19. Depending on the desired radiation characteristic, the cover element 6 can be made thicker or thinner in the second section 19, wherein the cover element 6 remains unchanged in the region of the first section 20 and the fastening projection 7. It is also conceivable to design the cover element 6 with different thicknesses all around in the region of the second section 19, so that the cover element 6 has different radiation characteristics along its circumference. The rigidity of the cover element 6 can also be designed differently over the circumference as a result.

[0044] Fig. 4 shows a further development of the embodiment of Fig. 1, in which the cover element 6 has a one-piece molded-on light-guiding section 11. Otherwise, the cover element 6 can be designed, particularly in the region of the fastening section 7 and the first section 20, according to the embodiment of Fig. 1. The light-guiding section 11 extends into the cavity 9 and has a light entry surface 13, which is arranged parallel to and opposite a light-emitting surface 12 of the light source 5, forming a gap with a constant gap width.

[0045] The light-emitting surface 12 of the light source 5 is considered an idealized light-emitting surface, which, when the light source 5 is configured with a plurality of LEDs, is considered the plane in which the LEDs are arranged. If the light source 5 is a planar light source, the light-emitting surface is the surface of the planar light source. If the light source 5 is configured in the form of a light guide, the light-emitting surface 12 is the average plane of the light exit surface of the light guide.

[0046] The cover element 6 further has a gap 14 between the light guide 11 and the first section 20 of the outer wall of the cover element 6, which gap allows the fastening section 7 to spring out radially outwards when the cover element 6 is fastened.

[0047] The light emitted by the light source 5 is then radiated via the light-emitting surface 12 and coupled into the light guide 11 via the oppositely arranged light entry surface 13. The light is then further transmitted in the light guide 11 into the first section 20, the second section 19, and the curved section of the cover element 6 located therebetween, and radiated via these sections to the outside.

[0048] Figure 5 shows the belt buckle 1 of Figure 1 with a light source 5 according to version A, which has a plurality of individual light sources 22 in the form of OLEDs on a carrier material 23. The OLEDs are arranged flatly on the carrier material 23 and, when all OLEDs are activated, together form a closed luminous ring on the surface of the light source 5. The OLEDs can be controlled individually and independently of one another, so that a running light can be created by a time-staggered, successive activation of the individual adjacent OLEDs. Furthermore, the OLEDs can also be designed to emit light in different colors or to change the color of the light they emit. The carrier material 23 serves to mechanically connect the OLEDs and, in addition to contacting the OLEDs, can have a conductor structure with a central connection to an external power supply.

[0049] Alternatively, according to version B, a light source 5 with a plurality of individual light sources 22 formed by LEDs can be provided. The LEDs are combined on a carrier material 23 to form a "COB (Chip On Board) light strip." A conductor structure for contacting the LEDs is provided in the carrier material 23, so that the carrier material 23 can also be regarded as a ring-shaped, flexible printed circuit board. In addition to arranging the various electrical components, the carrier material 23 also serves to attach the light source 5 to the housing 2, e.g., by clipping it. The LEDs can be designed either as monochrome LEDs or as RGB LEDs with a controllable color of the emitted light, although a mixture of such LEDs can of course also be provided.

[0050] Figure 6 shows an enlarged section of a light source 5 according to two different embodiments with a plurality of individual light sources 22. The individual light sources 22 are formed by monochrome LEDs in the upper embodiment and by RGB LEDs in the lower embodiment. The carrier material 23 of the light sources 5 consists of an electrically insulating material and supports various electrical components, such as the conductor structure 26, integrated resistors 25, and a LIN controller, which serve to supply power to and control the LEDs. The resistors 25 are located in the power supply between the LEDs and thus enable uniform brightness of the LEDs and thus of the light source 5.The conductor structure 26 in the carrier material 23 has two electrical contacts 24, which can be seen in Figure 5, which are connected to two mating contacts of a central power supply via a soldered connection, a crimp connection, or a plug connection, so that the individual light sources 22 are also electrically connected to the central power supply via these contacts. If monochrome LEDs are provided, they can be illuminated by a simple controlled current supply between 6 V or 12 V. If RGB LEDs are provided, they are preferably controlled via the LIN controller with a LIN slave and a LIN master. The LIN slave is provided on the carrier material 23, i.e. the circuit board. In addition to a plus-minus connection, this slave is also connected via a data pole to a vehicle control unit, which in this case forms the LIN master for the LIN slave.The plus-minus connection of contacts 24 is additionally supplemented by a control line (Data), which forms the data pole for the LIN controller.

[0051] By controlling the LIN slave via the LIN master, specific data commands can be executed, which are used to individually control the RGB LEDs. This allows for a wide variety of lighting concepts. For example, a circular light point, a continuous flashing of the LED light strip in any color, or even a continuous glow of the LED strip in the desired ambient lighting color can be realized.

[0052] The LEDs are arranged centrally and in a row on the carrier material 23 and are spaced identically apart. This ensures that the cavity 9 and the cover element 6 are evenly illuminated around their circumference, and the belt buckle 1 is correspondingly evenly illuminated.

[0053] The individual light sources 22 can be controlled individually and independently of one another, regardless of whether they are designed as monochrome LEDs, RGB LEDs, or OLEDs. Predefined lighting sequences, light intensities, and colors of the individual light sources 22 can be stored in a control program and called up to activate the light source 5. This allows for the implementation of various lighting concepts with regard to the color, lighting duration, and lighting rhythm of the individual light sources 22. The color of the emitted light, the lighting rhythm, and the light intensity of the individual light sources 22 are available for designing the radiation characteristics and the lighting concept of the belt buckle 1.

Claims

Claims:

1. Illuminated belt buckle (1) for a safety belt device of a motor vehicle with -a housing (2), -a push button (3) which can be moved in the housing (2), -an insertion slot (4) for inserting a belt tongue that can be locked in the belt buckle (1), and -at least one annular light source (5) comprising the insertion slot (4) and the push button (3), and -a cover element (6) covering the annular light source (5) towards the radial outside and the front side of the belt buckle (1), characterized in that -the light source (5) is formed by a plurality of independently controllable individual light sources (22).

2. Illuminated belt buckle (1) according to claim 1, characterized in that -the individual light sources (22) emit light with a different light intensity and / or color.

3. Illuminated belt buckle (1) according to claim 1 or 2, characterized in that - the individual light sources (22) are connected to one another by a carrier material (23) to form the annular light source (5).

4. Illuminated belt buckle (1) according to claim 3, characterized in that -an electrical conductor structure is provided in the carrier material (23), to which the individual light sources (22) are electrically connected.

5. Illuminated belt buckle (1) according to one of claims 1 to 4, characterized in that -the individual light sources (22) have a central common power supply (24).

6. Illuminated belt buckle (1) according to one of claims 1 to 5, characterized in that -a LIN controller is provided to control the individual light sources (22).

7. Illuminated belt buckle (1) according to one of claims 1 to 6, characterized in that the individual light sources (22) are formed by OLED segments.

8. Illuminated belt buckle (1) according to one of claims 1 to 6, characterized in that the individual light sources (22) are formed by LEDs.

9. Illuminated belt buckle (1) according to one of claims 1 to 8, characterized in that -the cover element (6) is formed in one piece from a translucent material.

10. Illuminated belt buckle (1) according to one of claims 1 to 9, characterized in that -the cover element (6) has a different light transmittance.

11. Illuminated belt buckle (1) according to claim 10, characterized in that -the cover element (6) has a lower light transmittance in the sections covering the individual light sources (22) than in the sections covering the sections between the individual light sources (22).

12. Illuminated belt buckle (1) according to one of claims 1 to 11, characterized in that -the cover element (6) has an integrally formed fastening projection (7) with which it is fastened to the housing (2) of the belt buckle (1).

13. Illuminated belt buckle (1) according to claim 12, characterized in that - that the fastening projection (7) has at least one latching hook (21) with which it is latched to an undercut of the housing (2).

14. Illuminated belt buckle (1) according to one of claims 1 to 13, characterized in that -the housing (2) has a closed ring section (8) comprising the insertion slot (4) and the push button (3), which delimits an annular cavity (9) towards the radial inside, wherein -the annular cavity (9) is delimited towards the radial outer side and the front side of the belt buckle (1) by the cover element (6), and -the light source (5) is arranged in the annular cavity (9).

15. Illuminated belt buckle (1) according to claim 14, characterized in that - the ring section (8) protrudes from a base surface (10) of the housing (2), and - the cover element (6) bears radially outwardly against a section of the housing (2) forming the base surface (10).

16. Illuminated belt buckle (1) according to claim 15, characterized in that - the light source (5) is arranged on the base surface (10) radially outwardly of the annular portion (8) of the housing (2).

17. Illuminated belt buckle (1) according to one of claims 1 to 16, characterized in that -the cover element (6) has an integrally formed light guide section (11) which has a light entry surface (13) arranged parallel and opposite to a light emission surface (12) of the light source (5).

18. Illuminated belt buckle (1) according to claim 17, characterized in that a gap (14) is provided between the integrally formed light-guiding section (11) and a radially outer edge of the cover element (6).

19. Illuminated belt buckle (1) according to one of claims 1 to 18, characterized in that -the cover element (6) is arranged without contact with the light source (5).

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