Security sign lights

Abstract

A safety sign luminaire (100) comprises a housing (60) extending along a longitudinal axis (L), an elongated illuminant arranged in the housing, a light guide plate (20) extending away from the housing (60) and designed to distribute the light coupled into the light guide plate (20) and to emit it via at least one flat side (21), and a pictogram element (90) arranged on the flat side (21) of the light guide plate (20), which pictogram element is designed in the manner of a plate or film and is illuminated by the light emitted by the light guide plate (20). Furthermore, a frame element (40) is provided which, for holding the pictogram element (90), comprises an edge region of the light guide plate (20) with the pictogram element (90) placed thereon.

Description

[0001] The present invention relates to a safety sign luminaire used to display emergency-relevant information in the form of an illuminated pictogram. In particular, the present invention relates to a luminaire used to indicate the direction of an escape route.

[0002] To ensure the safe evacuation of buildings in an emergency, it is essential that the appropriate escape routes be clearly and understandably indicated. For this purpose, safety or escape sign luminaires are used. These luminaires indicate the direction of the escape route using a suitably designed pictogram, which is appropriately illuminated by the luminaire's light source. Because the pictogram appears brighter than its surroundings, it is immediately recognizable, and the design of the pictogram makes the direction of the escape route immediately understandable.

[0003] While older versions of such safety sign luminaires typically used a larger, box-like housing in which the lamps were distributed and whose side walls were formed by corresponding panes with the corresponding pictogram, modern safety sign luminaires tend to use the now widely used fiber optic technology. In this case, a plate-shaped fiber optic cable is used to distribute the light generated by the lamps, into which light is coupled via a narrow side. By means of multiple reflections, the light is then distributed as evenly as possible across the entire surface of the fiber optic cable and then emitted via at least one flat side of the fiber optic cable. The pictogram, which is illuminated by the coupled-out light, is then located on this flat side.Compared to the original luminaire shape described above, more elegant designs can be realized in this way.

[0004] The present invention particularly relates to the question of how the pictogram is placed on the light guide in such a safety sign luminaire. For manufacturing reasons and with regard to the efficiency of light extraction, direct printing on the light guide is generally not practical. Instead, the pictogram is usually printed on a separate component in the form of a film or a thin plastic plate, which is then ideally detachably attached to the light guide plate. Various procedures for this are known from the prior art, for example the corresponding film is adhered to the light guide plate using adhesive film strips. The use of small expanding rivets at the corners and corresponding clips that grip the corners of the resulting arrangement is also known.

[0005] However, these known approaches are associated with certain disadvantages. For example, the adhesive method mentioned above makes the pictogram irremovable or subsequently replaceable only with increased effort. Furthermore, this increases the risk of contamination, as the area between the pictogram film and the light guide element cannot be cleaned. The use of the clips or expanding rivets mentioned above causes problems when replacing the pictogram later, for example, on a construction site, as these are small components that can easily be lost or are difficult to install by hand.

[0006] The present invention is therefore based on the objective of providing a novel solution that avoids the aforementioned disadvantages. In particular, film- or plate-like pictogram elements should be held neatly, attractively, and unobtrusively to a corresponding light guide. Furthermore, subsequent replacement of the pictogram should be as simple as possible, i.e., the pictogram element should be as easy to install and remove as possible.

[0007] The above-mentioned object is achieved by a safety sign luminaire having the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

[0008] The desired interchangeability of the pictogram element is achieved according to the invention by providing it as a separate component compared to the light guide, and by providing additional mounting measures by means of which the pictogram element is detachably held to the light guide. However, while the prior art uses several individual parts for this purpose, the present invention provides for the mounting of the pictogram element using a frame-like component, which, for mounting the pictogram element, comprises an edge region of the light guide plate with the pictogram element placed thereon.

[0009] According to the present invention, a safety sign luminaire is proposed which comprises: a housing extending along a longitudinal axis, an elongated illuminant arranged in the housing, a light guide plate extending away from the housing, which is designed to distribute the light coupled into the light guide plate and to emit it via at least one flat side, a pictogram element arranged on the flat side of the light guide plate, via which the light is emitted, which pictogram element is designed in the manner of a plate or film and is illuminated by the light emitted by the light guide plate, wherein, according to the invention, the safety sign luminaire further comprises a frame element which, for holding the pictogram element, comprises an edge region of the light guide plate with the pictogram element placed thereon.

[0010] The solution proposed within the scope of the present invention leads to very simple installation of the luminaire, while also ensuring secure and reliable mounting of the pictogram element. In particular, even exposing the luminaire to a water jet in accordance with the so-called IP65 test does not result in the pictogram element being damaged or even washed away. The function of the luminaire is therefore permanently maintained and is not negatively affected by such external influences. Despite this, however, the pictogram element is detachable and thus replaceable, so that the display of the desired information can be quickly and easily adapted to the current installation situation at any time.

[0011] According to an advantageous development of the invention, particularly reliable mounting of the pictogram element can be achieved in that the frame element, with the exception of a side facing the housing of the luminaire, essentially encompasses the entire edge region of the light guide plate with the pictogram element placed thereon. In this case, it is particularly preferably provided that the light guide plate and the pictogram element are rectangular and the frame element accordingly has a U-shape with two side webs pointing in the direction of the housing and a cross web connecting the side webs. The cross web of the frame element then encompasses a side of the light guide plate facing away from the illuminant, wherein, according to a particularly preferred embodiment, it can be provided that a reflector is inserted into this cross web.This reflector reflects light rays that have passed through the entire light guide plate from the light source back towards the light source, so that these light rays are not lost but can instead continue to be used for homogeneous and efficient illumination of the pictogram element.

[0012] It is also possible to create one or more openings in the crosspiece to allow water to drain away if necessary. These openings are preferably located in the area where the crosspiece meets the sidepieces.

[0013] The frame element used according to the invention to hold the pictogram element is preferably detachably fastened to the light guide plate, wherein a suitable snap-in connection can particularly preferably be provided. For this purpose, it can be provided that the light guide plate or the frame element has projections facing the other element, which, when the frame element is fastened to the light guide plate, engage in corresponding openings or recesses in the other element. It is particularly preferably provided that the light guide plate has several pairs of snap-in lugs, which engage in corresponding openings or windows in the frame element. Particularly preferably, the snap-in lugs of a pair are arranged opposite one another on the flat sides of the light guide plate, so that a very simple but nevertheless reliable snap-in holding of the frame element on the light guide element can be achieved.The side webs of the frame element can have enlarged tabs at their end region facing the housing, in which the aforementioned projections or recesses are formed.

[0014] In principle, the solution according to the invention already leads to reliable holding of the pictogram element on the light guide element. A defined positioning of the pictogram element can be additionally optimized in that the light guide plate has outwardly projecting projections on its flat sides, which reach through openings in the pictogram element. Particularly preferably, these projections simultaneously reach through openings in the pictogram element and also engage in the already mentioned openings or recesses in the frame element. This means that the corresponding projections are used simultaneously for the defined positioning of the pictogram element and for the locking holding of the frame element. Alternatively, it would also be conceivable for separate projections to be formed on the light guide element for each of the two tasks, or for the projections to be used for securing orPositioning of the pictogram element is omitted.

[0015] The concept according to the invention is applicable both to luminaires in which a pictogram element is arranged on one side of the light guide plate and to variants in which pictogram elements are arranged on both opposite flat sides of the light guide plate.

[0016] Particularly preferably, the light guide plate can be part of a one-piece component, a so-called light guide element, which has: a web-like light coupling section facing the illuminant, which is designed to couple in the light emitted by the illuminant, the light guide plate arranged downstream of the light coupling section, a cover which is designed to cover the housing of the safety sign luminaire on one side, wherein the cover is arranged between the light coupling section and the light guide plate, such that both sections extend from the cover in two opposite directions.

[0017] The cover can preferably have a closed, circumferential edge region that interacts sealingly with the housing of the luminaire. In particular, the edge region can form a sealing ridge oriented substantially perpendicular to the flat region of the cover, which is designed to engage a corresponding sealing channel in the housing. This simplifies the overall design of the luminaire and optimizes the arrangement and mounting of the light guide plate with respect to the light source.

[0018] Ultimately, the solution according to the invention leads to a particularly elegantly designed safety sign luminaire, which enables the flexible arrangement of differently switched pictogram elements on the light guide element.

[0019] The invention will be explained in more detail below with reference to the accompanying drawings. They show: Figure 1 shows a view of a safety sign luminaire according to the invention, with the aid of which the direction of an escape route is indicated; Figure 2 shows an exploded view of the luminaire according to Figure 1 , wherein the components responsible for positioning the pictogram elements on the light guide element are visible; Figure 3 the frame element used in the invention for holding the pictogram elements; Figure 4 a in the luminaire of Figure 1 used light guide element; Figure 5 the process of snapping the frame element onto the light guide plate; Figure 6 an enlarged view of a portion of the representation of Figure 5 ; Figure 7 shows the lower area of the light guide plate with the snapped-on frame element and Figure 8 shows the view of a further embodiment of a frame element provided for holding the pictogram element.

[0020] The basic structure of the Figures 1 to 7The safety sign luminaire shown, generally designated by reference numeral 100, is similar to comparable luminaires known from the prior art. In the illustrated embodiment, the illuminated indication of the direction of an escape route is also carried out with the aid of a pictogram element 90, which is arranged on at least one, in the present case on both flat sides of a rectangular light guide plate 20. Light is coupled into this light guide plate 20 from a narrow side, which light is then distributed as evenly as possible over the entire surface of the plate in a known manner via multiple reflections and then emitted via the flat side(s) on which the pictogram element(s) 90 is / are located.

[0021] The light coupled into the light guide plate 20 originates from elongated light sources, which can be formed, for example, by a linear arrangement of LEDs arranged within the housing 60 of the luminaire 100. The positioning of the LEDs is such that the light is coupled as efficiently as possible, i.e., completely, into the light guide plate 20 and then emitted via its flat sides. For this purpose, the light guide plate 20 can have corresponding output coupling structures in the area of the pictogram element 90, which no longer totally reflect incoming light rays, but rather redirect them such that they can exit the light guide plate 20. The positioning of these output coupling structures depends on whether corresponding pictogram elements 90 are arranged on one or - as shown - on both sides of the light guide plate 20.

[0022] Within the housing 60, which extends along the longitudinal axis L defined by the LED illuminants, not only the illuminants themselves are arranged. In addition, further electronic components for operating and supplying energy to the illuminants are typically also located within the housing 60. This can, in particular, be a suitably designed converter that supplies the LEDs with a voltage suitable for their operation. Emergency power supplies in the form of batteries or accumulators can also be arranged within the cuboid-like housing 60, which is then attached, for example, to a ceiling or another suitable support element.

[0023] The fastening of the light guide plate 20 to the housing 60 and the corresponding mounting in such a way that an optimized coupling of the light generated by the illuminants takes place can be carried out in various ways. The figures show a particularly preferred embodiment in which the light guide plate 20 is part of a so-called light guide element 10, which is insulated in Figure 4 This is preferably a one-piece component which, in addition to transmitting and distributing the light emitted by the LED lamps, also fulfils other functions.

[0024] For this purpose, the light guide element 10 essentially consists of three areas or sections, namely the already mentioned light guide plate 15, a light guide section 20 and a

[0025] Cover 25. All three sub-areas are preferably integrally connected to form a one-piece component, which is manufactured, in particular, by injection molding. In principle, it would be conceivable for the three sub-areas to consist of different materials, for example, the cover 25, explained in more detail below, to consist of an opaque material. However, the light guide element 10 according to the invention will generally consist entirely of the same, preferably clear, plastic material, with PMMA or PC being particularly suitable for this purpose.

[0026] The task of the light coupling section 15 is to absorb and transmit the light emitted by the LED lamps as completely as possible. The web-like light coupling section 15 has a narrow end face 16 on its upper side, which faces the LEDs and is positioned such that their light can enter the light coupling section 15 with as little loss as possible. If necessary, the end face 16 can also have additional structures tailored to the LEDs, such as lenses or the like, in order to further improve the efficiency of the light coupling.

[0027] Responsible for the actual light emission, i.e., the illumination of the pictogram 90, is the light guide plate 20 following the light coupling section 15, which is designed in a conventional manner as a classic flat light guide. The light guide plate 20 is thus plate-shaped in such a way that light is totally internally reflected several times, thus being transmitted and evenly distributed within the light guide plate 20. Via the aforementioned light output structures, the light can then be emitted evenly across one or both flat sides 21 of the light guide plate 20.

[0028] Finally, the third region of the light guide element 10, namely the cover 25, borders the transition area between the light coupling section 15 and the light guide plate 20. In addition to the lighting-related tasks described above, the light guide element 10 also simultaneously forms part of the housing of the luminaire 100. Strictly speaking, the cover 25 of the light guide element 10 serves to close the open underside of the actual housing 60 of the luminaire 100. Adjacent to the light coupling section 15 and the light guide plate 20, the cover 25 initially forms a cover region 26 oriented perpendicularly thereto, which forms the underside of the housing when the light guide element 10 is mounted on the housing 60. The dimensions of this cover region 26 therefore correspond to the dimensions of the further housing 60, whereby here too, the most tight connection possible between the cover 25 and the housing 60 is desired.For this purpose, a vertically extending web 28 is formed circumferentially around the edge of the cover area 26, which, when mounted on the housing 60, engages into a corresponding annular channel of the housing 60. In particular, a seal can be positioned in this seal, into which the upper end of the web 28 dips, so that an extremely efficient connection is achieved in the transition area between the housing 60 and the cover 25, which prevents the penetration of dust, but in particular also of moisture and splash water. Corresponding locking or clamping elements can also be formed on the cover 25, with the aid of which the light guide element 10 is fastened to the luminaire housing 60.

[0029] In the present case, the cover 25 also serves to hold emergency light lenses 29 used for escape route lighting. These are arranged in the horizontal cover area 26 laterally next to the centrally running light guide section 20 and are designed in a known manner such that they emit light in a targeted manner in a certain direction, for example to illuminate an escape route running below or diagonally below the luminaire 100. For this purpose, in addition to the already mentioned first illuminants for illuminating the pictogram 90, further illuminants are arranged inside the luminaire housing 60, which are assigned to the emergency light lenses 29 and can be selectively activated in order to illuminate an escape route with the aid of an emergency light lens 29 assigned to it. This additional escape route lighting, however, merely represents an optional advantageous addition to the inventive concept. If necessary,the emergency light lenses 29 with the associated lamps could also be dispensed with.

[0030] The present invention specifically addresses the problem of arranging the pictogram element(s) 90 in a suitable manner on the light guide plate 20. A frame-like holding element, which is also referred to below as a frame element and is designated by reference numeral 40 in the figures, is responsible for this.

[0031] The frame element is insulated in Figure 3and, viewed as a whole, has a U-shaped configuration with two side webs 42 and a transverse web 44 connecting the two side webs 42. These webs 42 and 44 are also U-shaped or C-shaped in cross section and thus have a central web 42a or 44a, which connects two opposite edge webs 42b and 44b. This configuration results in the frame element 40 being able to be pushed onto the light guide plate 20 with the pictogram elements 90 placed thereon and then encompassing the edge regions of the resulting configuration, as can be seen from Figure 1can be seen. In this case, the central webs 42a and 44a then rest against the side walls and the lower end wall of the light guide plate 20, with the edge webs 42b and 44b overlapping the edge regions of the light guide plate 20 as well as the edge regions of the pictogram element 90. Ideally, and as shown, the frame element 40, with the exception of that side of the light guide plate 20 which merges into the cover 25 of the light guide element 10, essentially encompasses the entire edge region of the light guide plate 20 with the pictogram element(s) 90 placed thereon, so that when the frame element 40 is in the attached state, the pictogram element 90 is securely held.

[0032] Splashing water from the side of the resulting configuration cannot cause the pictogram element 90 to become detached from the illustrated arrangement or damaged. The long-lasting function of the luminaire 100 and thus a reliable representation of the direction of the escape route is thus ensured. The frame element 40 is preferably formed by a plastic part, in particular a part made of a transparent plastic, which thus blends neatly and elegantly into the appearance of the luminaire 100 and does not negatively affect its appearance.

[0033] To assemble the luminaire 100, more precisely to attach a pictogram element 90 to the light guide plate 20, the pictogram element 90, whose dimensions preferably correspond essentially to the dimensions of the light guide plate 20, is first placed on its flat side. Subsequently, the frame element 40 is attached from the underside as shown in Figure 5 shown pushed onto the sandwich-like arrangement of the light guide plate 20 with the pictogram element(s) 90 and in the Figure 1 This results in the already explained reliable and defined mounting of the pictogram element 90 on the light guide plate 20, which simultaneously ensures efficient illumination of the pictogram.

[0034] The fastening of the frame element 40 to the light guide plate 20 is preferably carried out in the form of a snap-in connection, which is described below in particular with reference to Figure 6should be explained in more detail.

[0035] In the illustrated embodiment, the light guide plate 20 has, in the upper end region near the cover 25, pairs of snap-in lugs 30, which are each formed opposite one another on the flat sides of the light guide plate 20. At the upper end region of the two side webs 42, the edge webs 42b of the frame element 40 are expanded to form tabs 46, which have recesses or openings 48 corresponding to the snap-in lugs 30. During assembly, the frame element 40 is pushed onto the light guide plate 20 until the tabs 46 have reached the upper end region of the light guide plate 20, wherein in this position the snap-in lugs 30 can then engage in the recesses or openings 48 in a locking manner.This locking mechanism ensures reliable and permanent retention of the frame element 40 on the light guide plate 20. To release the locking mechanism, only the edge webs 42b of the side webs 42 of the frame element 40 in the area of the tabs 46 need to be slightly bent upwards. The frame element 40 can then be pulled downwards again to release the pictogram element(s) 90 and, if necessary, to replace them. Of course, it would also be conceivable in an analogous manner to provide inwardly projecting snap projections on the tabs 46, which then engage in corresponding recesses in the light guide plate 20.

[0036] In the Figures 1 to 7 In the exemplary embodiment shown, it is further provided that the pictogram element(s) 90 are secured in a predetermined height position relative to the light guide plate 20 by additional measures. As in Figure 6As can be seen, two further projections 32 are formed below the aforementioned snap-in lugs 30 on the light guide plate 20, which engage in corresponding openings 92 of the pictogram element 90. In particular, in the stage in which the frame element 40 is snapped onto the light guide plate 20 and the three webs 42 and 44 accordingly encompass the edge regions of the light guide plate 20 and the pictogram element 90, the vertical position of the pictogram element 90 is fixed and it cannot inadvertently move upwards.

[0037] For the illustrated embodiment, this is relevant insofar as it is intended that the upper edge of the pictogram element 90 has a certain distance d (see Figure 6) to the underside of the cover 25 of the light guide element 10. This means that in the exemplary embodiment shown, the uppermost region of the light guide plate 20 is not covered laterally by the pictogram element 90 and can be used to additionally mix the light rays totally reflected within the light guide plate 20 before they are then laterally coupled out in the region of the pictogram to emit light. It has been found that the use of such a mixing region leads to improved properties with regard to homogeneous illumination of the pictogram, whereby in the present exemplary embodiment the mixing region is now located - at least partially - outside the actual luminaire housing 60. It would certainly be conceivable to relocate this region, in which this preliminary mixing of the light takes place, completely into the interior of the housing 60. However, this would require more space and thus possiblylead to a larger housing design. With the solution proposed here, however, it is possible to design the housing 60 of the luminaire 100 in a particularly compact and elegant manner. In this case, however, it is advantageous if the height position of the pictogram element 90 is fixed, which is achieved with the aid of the above-described projections 32 on the light guide plate 20 and the openings 92 in the pictogram element 90.

[0038] In the illustrated embodiment, the light guide plate 20 has, on the one hand, the snap-in lugs 30 for the locking mounting of the frame element 40 and, on the other hand, the projections 32 for the defined positioning of the pictogram element 90. Alternatively, however, it could also be provided that corresponding projections fulfill both functions simultaneously. This is the case with the variant in Figure 8 the case where, compared to the embodiment of the Figures 1 to 7The lateral tabs 46 of the frame element 40 with the openings 48 are arranged slightly offset downward, i.e., they are not located at the upper end of the side webs 42. In this case, snap-in lugs 30 are again provided on the light guide plate 20, which are positioned in pairs on the opposite flat sides of the light guide plate 20. However, these snap-in lugs 30 now extend through both the openings 92 provided in the pictogram element 90 and the openings or recesses 48 of the frame element 40.

[0039] A similar solution would be in the Figure 6illustrated variant would also be conceivable if the pictogram element 90 extended completely to the upper edge of the light guide plate 20 and then corresponding openings 92 were provided in the upper region of the pictogram element 90, through which the snap lugs 30 of the light guide plate 20 extend before they engage in the openings or recesses 48 of the frame element 40.

[0040] In principle, however, it would also be conceivable to dispense with this additional securing measure for holding the pictogram element 90. This applies in particular in the case where the dimensions of the pictogram element 90, including its height, completely correspond to the dimensions of the light guide plate 20, since in this case the positioning of the pictogram element 90 is clearly determined solely by the snapped-on frame element 40.

[0041] In summary, there are several possibilities for realizing the detachable mounting of the frame element 40 on the light guide plate 20 and, if necessary, additionally determining the position of the pictogram element 90. a) In a first variant, only the snap lugs 30 can be provided for frame fastening. Additional securing of the pictogram element 90 by means of the further projections 32 is omitted. b) In a second variant, which is similar to the illustration in Figure 6 snap lugs 30 are provided for holding the frame element 40 and separate securing projections 32 for holding the pictogram element 90. c) Finally, as shown in Figure 8 As explained, projections 30 provided on the light guide plate 20 can simultaneously be provided both for holding the frame 40 and for securing the pictogram element 90.

[0042] Finally, based on Figure 7Further functions will be explained which can be fulfilled with the aid of the frame element 40 according to the invention.

[0043] It is entirely possible that light rays coupled into the light guide plate 20 reach the lower end region of the light guide plate 20 without first being coupled out to illuminate the pictogram element 90. To prevent such light rays from escaping downwards, which would detract from the appearance of the luminaire 100, but instead continue to be used to illuminate the pictogram element 90, the lower crossbar 44 of the frame element 40 can be used to hold a narrow reflector strip 50. This is inserted into the lower crossbar 44, as indicated, and reflects rays reaching the lower end region of the light guide plate 20, so that they now travel back upwards and then strike the coupling-out structures of the light guide plate 20 to illuminate the pictogram element(s) 90.

[0044] Furthermore, it cannot be ruled out that liquid may accumulate in the area of the frame element 40 due to high humidity or other influences. To prevent this liquid from accumulating and potentially negatively affecting the appearance of the luminaire 100 or damaging the pictogram element 90, openings 49 can be provided in the lower crossbar 44 of the frame element 40 to allow this water to drain away. In the illustrated embodiment, these are slot-like openings 49 formed at the transition area between the crossbar 44 and the side bars 42. This configuration is advantageous in that these openings 49 have little or no impact on the appearance of the frame element 40 and thus of the luminaire 100 as a whole. In principle, however, such openings could also be formed at other locations on the frame element.

[0045] Ultimately, the solution according to the invention allows for the simple and flexible arrangement of pictogram elements on the light guide plate of a safety sign luminaire. The solution according to the invention results in a particularly advantageous appearance of the luminaire and also allows for the pictogram element to be subsequently changed, thus changing or adapting the presentation of the information displayed by the luminaire if necessary.

Claims

1. Safety sign luminaire (100), which comprises a) a housing (60) extending along a longitudinal axis (L), b) an elongated illuminant arranged in the housing, c) a light guide plate (20) extending away from the housing (60), which is designed to distribute the light coupled into the light guide plate (20) and to emit it via at least one flat side (21), d) a pictogram element (90) arranged on the flat side (21) of the light guide plate (20), via which the light is emitted, which pictogram element is designed in the manner of a plate or film and is illuminated by the light emitted by the light guide plate (20), characterized by a frame element (40) which, for holding the pictogram element (90), comprises an edge region of the light guide plate (20) with the pictogram element (90) placed thereon.

2. Safety sign luminaire according to claim 1, characterized by thatthe frame element (40), with the exception of a side of the light guide plate (20) facing the housing (60), essentially comprises the entire edge region of the light guide plate (20) with the pictogram element (90) placed thereon.

3. Safety sign luminaire according to claim 2, characterized by that the light guide plate (20) and the pictogram element (90) are rectangular and the frame element (40) is U-shaped with two side webs (42) pointing in the direction of the housing (60) and a cross web (44) connecting the side webs, wherein the cross web (44) of the frame element (40) comprises a side of the light guide plate (20) facing away from the illuminant.

4. Safety sign luminaire according to claim 3, characterized by that a reflector (50) is inserted into the crosspiece (44).

5. Safety sign luminaire according to claim 3 or 4, characterized by thatthe transverse web (44) has one or more openings (49) which allow water to drain away, the openings (49) preferably being formed in the region of the transition to the side webs (42).

6. Safety sign luminaire according to one of the preceding claims, characterized by that the frame element (40) is detachably attached to the light guide plate (20), preferably via a snap-in connection to the light guide plate (20).

7. Safety sign luminaire according to claim 6, characterized by that the light guide plate (20) or the frame element (40) has projections (30) facing the other element, which, when the frame element (40) is fastened to the light guide plate (20), engage in corresponding openings or recesses (48) of the other element.

8. Safety sign luminaire according to claim 7, characterized by thatthe light guide plate (20) has a plurality of pairs of snap-in lugs which engage in corresponding openings or windows of the frame element (40), the snap-in lugs of a pair being arranged opposite one another on the flat sides (21) of the light guide plate (20).

9. Safety sign luminaire with the features of one of claims 3 to 5 and according to claim 7 or 8, characterized by that the side webs (42) of the frame element (40) have, at their end region facing the housing (60), enlarged tabs (46) in which the projections or recesses are formed.

10. Safety sign luminaire according to one of the preceding claims, characterized by that the light guide plate (20) has outwardly projecting projections (32) on its flat sides (21) which pass through openings (92) in the pictogram element (90).

11. Safety sign luminaire according to claim 10 and one of claims 7 to 9, characterized by that the projections simultaneously pass through openings (92) of the pictogram element (90) and engage in the openings or recesses (48) of the frame element.

12. Safety sign luminaire according to one of the preceding claims, characterized by that pictogram elements (90) are arranged on both flat sides (21) of the light guide plate (20).

13. Safety sign luminaire according to one of the preceding claims, characterized by thatthe light guide plate (20) is part of a one-piece light guide element (10) which has: • a web-like light coupling section (15) facing the illuminant, which is designed to couple in the light emitted by the illuminant, • the light guide plate (20) arranged downstream of the light coupling section (15), • a cover (25) which is designed to cover the housing (60) of the safety sign light (100) on one side, wherein the cover (25) is arranged between the light coupling section (15) and the light guide plate (20) in such a way that both sections (15, 20) extend from the cover (25) in two opposite directions.

14. Safety sign luminaire according to claim 13, characterized by that the cover (25) has a closed peripheral edge region (28) which cooperates sealingly with the housing (60) of the luminaire (100).

15. Safety sign luminaire according to claim 14, characterized by that the frame element (40) is made of a clear plastic material.

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