EP2913582B1 - Diffuser for a luminaire - Google Patents

Description

The invention relates to a diffuser for an elongate, in particular an LED lamp with a series arrangement of LEDs, wherein the diffuser is formed in cross-section perpendicular to the longitudinal extent substantially U-shaped with two side legs and a side portion connecting the side legs. The invention further relates to an assembly for an elongate LED lamp and a lamp, each comprising such a diffuser.

Such a conventional diffuser is used in elongated lights to achieve a predetermined light distribution of the lamp. In particular, when used for an LED lamp, in which a plurality of LEDs are arranged in series, ideally the light impression of a homogeneous, elongated light source should be generated. For this purpose, the diffuser is usually made of a highly scattering material, in particular a translucent material to scatter the emitted light from the lamp light during the transmission of light through the diffuser such that for a viewer the desired light impression, respectively the desired light distribution is generated. Especially with LED lights can result from shading in this regard, which disturb the light impression.

The US 2013/0128572 A1 relates to a ceiling lamp according to the preamble of claim 1, comprising a base body on which a reflector plate is applied, which itself carries an engaging plate made of metal, with which an LED base plate is brought into engagement. The LEDs are covered by a translucent tubular cover, the cover having engagement projections which are engaged with the engagement plate. The US 2011/0141729 A1 relates to a retrofit lamp comprising a housing and a plurality of light sources mounted on the housing, the light sources being covered by a linear batwing lens and the batwing lens and the housing having cooperating hook elements for holding the lens to the housing. The US 2013/0044475 A1 relates to a luminaire comprising a reflective element having one or more apertures for passing a first portion of light from one or more light sources, and for reflecting a second portion and having a refractive element for receiving and transmitting the first and second portions of the light. The EP 2 672 172 A1 relates to a luminaire with a longitudinally extending support profile to which a device carrier is attached, to which a lighting means is mounted. At least one mounted on the equipment carrier reflector is provided with two projecting side walls, wherein the lamp further comprises a spaced from the reflector arranged diffuser. The US 2002/0101733 A1 relates to a light tube for use over a light source, the tube having in the longitudinal direction a slot from which extend two inwardly extending flanges to form a channel for receiving a foil which reflects the light emitted by the light source with respect to its characteristics such as color , Polarization, beam direction etc. changed.

The invention has for its object to make conventional diffuser for elongated lights so that a simple construction of the lamp is made possible while maintaining a desired light distribution and this can be improved.

This object is achieved by a diffuser having the features of claim 1. The diffuser according to the invention is characterized in that on both side legs in the region of their free ends to provide further optically effective diffuser wall sections in each case one, to the U-shape inside and formed to the roof portion extending lip is formed.

The formation of the respective lip in the region of the side legs of the diffuser and thus inside the diffuser leads to the formation of further, internal and optically effective, i. for the light distribution effective diffuser wall sections. In other words, the configuration of the respective lip according to the invention on the associated side limbs results in a sequence of at least two optically effective diffuser wall sections in the case of a horizontal cross-section of the diffuser, whereby the diffuser properties of the diffuser are substantially improved there. The lips may extend at least in sections up to the roof portion and thus lead to other areas, and in which incident light is reflected or scattered, so often occurring in these sections core shadows are softened, which otherwise to an undesirable light impression due to an inhomogeneous light distribution being able to lead.

With the inventive design of a diffuser arise in the construction of the elongated light, in particular an LED lamp increased flexibility in the design or design of the lamp. For example, the diffuser according to the invention allows greater flexibility in the arrangement of electronic and / or mechanical components without adversely affecting photometric specifications. For example, with the diffuser designed according to the invention, in many applications it is possible to dispense with the provision of a further optical element for beam shaping, in particular a primary optic mounted in direct proximity to the LED row. It should be noted, however, that the diffuser according to the invention can also be used together with other optical elements such as such a primary optics.

The integrally formed in the region of the free end of a side leg lip may on the one hand be designed so that it extends slightly spaced from the free end of a side leg out of the wall, but it is also possible that at the free end of such a side leg said lip connects or the side legs in such a lip passes.

Further features according to the invention are given in the following general description, the description of the figures and the subclaims.

Conveniently, both molded lips inside the U-shape and in particular in the region of their respective free ends to each other to extend, such that the distance of the lips with increasing lip height, ie decreases with increasing extent in the direction of the roof section. The lips may also have a curvature in the region of their free ends, they do not necessarily have to be straight. Expediently, the lips inside the diffuser can extend into those spatial regions in which geometric core shadows are generated which are lightened by the lips for an outside observer or softened. In this case, light reflected or scattered by the inner surface of the diffuser or the volume of the diffuser, which impinges on the lips, scattered or reflected through the lips, which contributes to a homogenization of the light distribution.

Conveniently, it can be provided that a molded in the region of its free end to a side leg lip with the associated Seitenschenkelwandung a gutter or trench-like design, the opening of this design can point towards the roof portion of the U-shape of the diffuser. By this measure it can be achieved that even more light hits by scattering and / or reflection on the lips, so that a further brightening or homogenization of certain areas within the diffuser is made possible.

Appropriately, it may be provided that a Seitenschenkelwandung at the free end of a side leg has an inwardly extending curvature region, to which, as already stated above, can connect an associated lip. However, it is also possible that the end of the side leg initially extends inwardly, ie purely horizontally and then adjoins this extension then extending upwards in the direction of the roof section lip. The specific design of the lip can each be adapted to the geometric conditions in the luminaire.

For the design of the diffuser according to the invention are both injection molding, but also extrusion process, since the described design of the diffuser can be maintained across the length of the longitudinal extent across the length.

It can be provided that the wall of the roof section in the section perpendicular to the longitudinal extent of the diffuser has a particular central recess inwards to light emitted from the light source such as an LED row in the direction of both side legs on the inner surface of the roof section reflect. As a result, on the one hand even more light can fall on the lips, which leads to a further brightening of any existing shadow areas. In addition, a comparatively high degree of indirect illumination can be achieved by this measure, since the light reflected from the inside of the roof section in the direction of the side legs and transmitted there to the outside radiated to the ceiling and thus contributes to the indirect illumination of a room.

Depending on the embodiment of the diffuser according to the invention, the described effect of the lightening can be achieved by the additional lips arranged inside the U-shape of the diffuser or the generation of indirect light, i. towards the ceiling radiated light, be further optimized. For this purpose, it can expediently be provided to provide the inside of the roof section of the diffuser in the region of the indentation with a glossy or high-gloss surface, so that a high proportion, which can be in the percentage range of the incident light, increases in the direction of the lips or the side legs of the diffuser judge. To increase the reflectance of this area may be the surface of the inside of the roof section.

In a further embodiment, which can be combined with the preceding one, it can expediently be provided to equip the inside of the roof section in the region of the indentation with radii of curvature adapted to the respective geometry in order to optimize the direction of the light reflected on the inside of the diffuser.

According to the invention, on the one hand, the scattering character of the material of the diffuser can be used to design a light distribution that is as homogeneous as possible and, on the other hand, the reflection properties of the diffuser on the inside in the area of the indentation can be used to optimize the light emission characteristic.

Advantageously, the longitudinally extending lips of the diffuser can also be designed for fastening the diffuser to an associated holding device of the luminaire. For this purpose, a fastening means can be arranged on the inside of the respective lip, which can be formed in particular as longitudinally extending with the lip locking element. In this case, the integrally formed on the lip locking element can provide a running surface for a locking cam of a holding device of the lamp for the fastening operation, in which the relative movement of the tread to the locking cam of the holding device springing back the lip can be provided for a subsequent latching operation, in which a Contact surface of the locking element comes to rest against a locking surface of the locking cam of the holding device.

Conveniently, the diffuser according to the invention can be further developed in that at the free end of the side legs in each case a longitudinally extending web is arranged. This web may extend parallel to the respective side legs and set in an area where the lip attaches to the side legs. In this respect, the web can be placed at a curvature region or at a horizontally extending region which adjoins the side limb. It can be provided that the web extends substantially vertically, in particular in a direction averted with respect to the roof portion of the diffuser. By providing this web, a more homogeneous appearance of the diffuser according to the invention can be achieved become. In particular, the web can be designed so that it provides an outer viewing surface, which cooperates with the outer lateral surface of the respective side leg to achieve a closed overall impression.

Conveniently, it can be provided that the respective web interacts at the free end of a side leg with a further section of the diffuser lying inside the web to form an open channel. This channel can in particular be designed to receive a seal which, like the web, can extend in the longitudinal axis of the diffuser and thus in the installation position of the diffuser hermetically seals the interior against moisture, insects or dust. Preferably, it may be provided that this further portion of the diffuser is a part of the fastening means on the lip, for example extending an extension of a locking element approximately in the installed position of the diffuser in the vertical direction and extending away from the free end of the lip of the side leg. By such a configuration, the fastening means as a locking element at the same time also provide a wall for a sealing channel, which reduces the design complexity in the design of the diffuser according to the invention.

On the other hand, however, it can also be provided, spaced apart from the web, to provide a further web in the area of the free end of the respective side limb which extends approximately vertically in the installation position of the diffuser, wherein the webs spaced from one another and extending parallel to the respective side limb form the sealing channel Form a seal, which seal the diffuser in installation position against a device carrier or a lamp housing.

The said webs for forming a sealing channel can be made integral with the diffuser, so that this represents a one-piece component.

The invention further relates to an assembly for an elongated LED lamp with a, a geometric series arrangement of LEDs having board and holding means for securing the board to a support, such as an elongated equipment carrier or a lamp housing, wherein holding means arranged in the longitudinal direction to both sides of the LEDs are and inventively designed diffuser in the mounting position, the holding devices engages around and integrally formed on a lip of the diffuser locking element with the holding device for holding the diffuser cooperates. Such an assembly can be used to design a luminaire or a light strip of any length. In this case, a modular design may be expedient, in particular by the provision of an elongated support profile which is attached to the ceiling to which a device carrier can be fastened, which carries such an assembly consisting of the LED board, the holding means and the inventively embodied diffuser ,

Conveniently, the lips of the diffuser in installation position with respect to their height in the direction of the roof portion may be formed so that they extend geometrically beyond the holding means and in this way provide for a brightening of the shading area generated by the holding device. In addition, it can also be provided that the lips extend so far inwards into the U-shape and upwards in the direction of the roof section that they lie in the cross-section to the longitudinal extent of the diffuser outside of the direct light emitted by the light source. Again, can be brightened by the lips angle ranges of the diffuser or an associated light, in which there is no emission of direct light due to the light source used.

In order to achieve as homogeneous a light distribution as possible, it may be expedient to adjust the clear height of the diffuser in the installed position, i. make the distance between the LEDs and the roof section larger than with conventional assemblies for LED lights. In particular, it may be expedient to set the distance between the LEDs and the roof section in the region of the indentation greater than approximately 2.5 cm, in particular greater than 2.8 cm. In this case, the preferably central and extending in the longitudinal direction of the diffuser recess can be comparatively small, and especially in the range of about 10% - 12% of the smallest distance between the LEDs and the roof section in the region of the indentation.

On the inside of the diffuser, radii of curvature in the region of the indentation of the roof section may expediently be designed in such a way that the light emitted by an LED in a cross-sectional plane is reflected as direct light to the inner surface of a side limb, from which it is either reflected back, in particular in the direction transmitted to the lip or in the side legs and leaves this outwards. The person skilled in the art recognizes that, depending on the technical specifications, the generation of indirect light or the generation of a brightening of shadow areas within the luminaire can be specifically optimized as required.

To provide glare for directly downwardly radiated light in the assembly according to the invention for an LED light, the additional use and arrangement of an elongated light grid can be provided with in installation position up and down open housing frame, the housing frame a raster insert with two side reflectors and a plurality of longitudinally spaced transverse reflectors comprises. Preferably, in installation position the diffuser at least partially disposed between the two side reflectors and thus protrudes into the grid housing. Appropriately, it can be provided that the diffuser protrudes so far into the grid housing that direct light of the LEDs of the diffuser transmits to the side legs. This design has the advantage that the light generated due to the reflection on the inner surface of the diffuser in the region of the indentation can continue to leave the diffuser despite the use of a light grid for generating indirect light, which is reflected at the mounting ceiling. In addition, for a viewer in a lateral view of the lamp by the described lighting effect of the lips softening possibly existing core shadows is reached.

In addition, with the present application, a second diffuser for an elongated lamp, in particular an LED lamp with a series arrangement of LEDs, disclosed as inventive and described, which is formed in cross-section perpendicular to the longitudinal extent substantially U-shaped with two side legs and a the side legs connecting roof section. In this case, the roof section in the section perpendicular to the longitudinal extent of a recess inwardly for generating reflected light on the side legs. In this respect, it is not necessary in this subject invention of the above-described additional lip on both side legs. All other, not related to the lip and described above developments of the first described diffuser or a related assembly are also applicable to the second inventive diffuser. For example, in the case of the second diffuser, the inner side of the roof section may also expediently have a glossy or high-gloss surface in the region of the indentation. Here are the locking elements described above not in each case on a lip according to the first subject of the invention, but instead arranged directly on the two side legs for cooperation with associated latching elements of the holding devices or hold-downs.

Figur 1

in einer perspektivischen Ansicht eine erfindungsgemäß gestalteter Diffusor zusammen mit weiteren Bauteilen einer Baugruppe für eine LED-Leuchte,

Figur 2

die in Figur 1 dargestellte Baugruppe ohne Diffusor in einer perspektivischen Ansicht,

Figur 3

die in Figur 1 gezeigte Baugruppe in einer Schnittdarstellung senkrecht zur Längsachse,

Figur 4

eine Ausschnittvergrößerung der Fig. 3,

Figur 5

die in Figur 1 gezeigte Baugruppe erweitert um ein Tragprofil in einer Schnittdarstellung senkrecht zur Längsachse,

Figur 6a

in einer perspektivischen Explosionsdarstellung ein Lichtraster für die in Figur 4 angegebene Baugruppe,

Figur 6b

das zusammengesetzte Lichtraster der Figur 6a in einer Schnittdarstellung senkrecht zur Längsachse,

Figur 7a

eine zu der in Figur 5 um das Lichtraster gemäß Figuren 5a, b erweiterte Baugruppe vor der Zusammenfügung in einer vereinfachten Schnittdarstellung,

Figur 7b

die Baugruppe der Fig. 7a im zusammengesetzten Zustand,

Figur 8

eine weitere Ausführungsform 1' eines erfindungsgemäß ausgebildeten Diffusors, und

Figur 9

in einer perspektivischen Ansicht den Diffusor 1' zusammen mit weiteren Bauteilen einer Baugruppe für eine LED-Leuchte einschließlich eines Tragprofils

zeigen.The invention will be elucidated below with reference to the accompanying drawings by describing some embodiments, wherein

FIG. 1

3 shows a perspective view of a diffuser designed according to the invention together with further components of an assembly for an LED luminaire,

FIG. 2

in the FIG. 1 shown assembly without diffuser in a perspective view,

FIG. 3

in the FIG. 1 shown assembly in a sectional view perpendicular to the longitudinal axis,

FIG. 4

a section enlargement of the Fig. 3 .

FIG. 5

in the FIG. 1 shown assembly extended by a support profile in a sectional view perpendicular to the longitudinal axis,

FIG. 6a

in a perspective exploded view, a light grid for in FIG. 4 specified assembly,

FIG. 6b

the composite light grid of FIG. 6a in a sectional view perpendicular to the longitudinal axis,

Figure 7a

one to the in FIG. 5 to the light grid according to Figures 5a, b extended assembly prior to assembly in a simplified sectional view,

FIG. 7b

the assembly of the Fig. 7a in the assembled state,

FIG. 8

a further embodiment 1 'of an inventively designed diffuser, and

FIG. 9

in a perspective view of the diffuser 1 'together with other components of an assembly for an LED lamp including a support profile

demonstrate.

The structure and the use of an inventively designed diffuser 1 is in FIG. 1 shown. Illustrated is an assembly 100, comprising an elongate device carrier 110, on which a circuit board 120 is arranged, which has a plurality of juxtaposed to the longitudinal axis in series LEDs 121, wherein the board 120 is secured by means of a holding means in the form of a plurality of hold-down 130 , These hold-downs are arranged left and right to the LED row and extend in the transverse direction spaced from the LED row each on one side spaced from each other over the entire longitudinal extent of the board. The attachment of the board on the equipment carrier 110 is carried out in the specified embodiment by at each of the hold-down means of a screw 131 which extends through the respective hold-down 130, the board 120 to the equipment carrier 110.

The diffuser 1 is constructed substantially in cross section perpendicular to the longitudinal extent U-shaped with side legs 2A, 2B and a roof or middle leg 3 connecting these side legs. The roof leg has centrally over its entire longitudinal extension and thus corresponding to the LED row on a V-shaped indentation, starting from the plane of symmetry S equivalent roof sections 3a, b and 3 b, d are formed, which have different radii of curvature on the inside and will be discussed in more detail below. The plane of symmetry runs through the center of the indentation as well as through the center of the LED row.

The perspective view of FIG. 1 also reveals a specific design of the side legs at their free ends for the described embodiment. At the two, together with the roof leg 3, the basic U-shape forming side legs 2A, 2B is in each case starting from the most distant to the roof leg region inward, ie in the direction of the LED row and upwards toward the roof portion extending lip 5a, b molded. In the illustrated embodiment, these lips 5a, b at least partially surround the hold-downs 130.
Again lying inwardly to the lip 5a, 5b, ie in the direction of the LED row, is formed on each one extending with the lip over the entire longitudinal extent of the diffuser, in cross-section ridge-shaped locking element 6a, b formed. These latching elements 6a, 6b have a locking surface 7a or 7b on the upper end face facing the roof leg. On the function of the locking elements 6a, 6b will be discussed in more detail below.

In the described embodiment, the diffuser 1 is made of a translucent material by means of a continuous casting process, the desired diffuser effect essentially resulting from the interaction of the light with the diffuser material in the volume of the diffuser.

Like from the FIG. 1 As can be seen, the two side legs 2A, 2B extend substantially in such a way that they extend continuously from one another to the free end move away. The adjoining respective lip 5a, 5b have their respective starting point approximately at the lowermost end, ie the farthest end of the side legs of the roof leg.

FIG. 2 shows an enlarged view of the assembly according to FIG. 1 , wherein for clarity of illustration of the diffuser 1 has been omitted. As described, the LED board 120 is fastened to the equipment carrier 110 via hold-downs 130 arranged laterally to the row of LEDs, wherein the fastening screw 131 extends through the hold-down device 130, the circuit board 120 into the equipment carrier 110. Shown is also a frame 50 shown, which is arranged at the end of such an assembly. This frame has corresponding to the inner contour of the diffuser 1, see FIG. 1 , a receiving flange 52, wherein the end face of the diffuser 1 comes to lie in the installed state of the frame web 51 of the frame 50.
Depending on the embodiment of the illustrated assembly, this may have a length of, for example, 1500 mm, wherein a luminaire of any length can be realized by a juxtaposition of a plurality of such assemblies. In this respect, the in FIG. 2 shown frame 50 may be formed either as an end cap or mirror-symmetrical to a plane perpendicular to the longitudinal axis, so that on the frame from both sides as in FIG. 1 specified diffuser can be pushed and held.

The hold-downs 130 spaced on either side of the LED array extend on either side of the LED array, spaced from one another over the entire length of the assembly 100 or diffuser 1. In this regard, of this plurality of hold-downs in the FIG FIG. 2 shown section only one per page shown.

In the described embodiment of the assembly they are Retainers are designed to be multifunctional, ie they serve, on the one hand, for the described attachment of the printed circuit board 120 to the equipment carrier 110. In addition, fixing means in the form of latching elements 132, in particular in the manner of a latching cam, are provided on the inside in installation position in the direction of the LED row. Only the locking element 132 of the rear hold 130 is in the FIG. 2 recognizable, the lower hold-down 130 in the figure can expediently constructed identical to the upper. The latching elements 132 arranged on the inner surface of the hold-down devices 130 have no function in the illustrated embodiments, but can be used to hold a primary optic mounted directly over the LED row for additional light guidance. Such additional design is fully within the scope of the present invention.

From the in FIG. 1 As shown, it can be seen that the diffuser 1 engages around all hold-downs so that the fastening of the diffuser is effected by means of fastening elements which are arranged on the outside of the hold-downs 130 and cooperate with a complementary fastening element on the diffuser for holding the diffuser on the assembly.

How out FIG. 2 recognizable with reference to the lower hold-down 130, this comprises on its outer side three latching elements 133, 134 and 135 designed as locking cams, which are constructed identically with respect to their construction with the exception of their longitudinal extent. In this respect, in the following only the middle, in its longitudinal extent larger locking element 133 is taken in the form of a locking cam reference.

The locking element 133 has a rigid, acting as a control surface inclined surface 133a for guiding a arranged on the diffuser 1 locking element for the operation of the engagement of the diffuser with the downers on. In addition to a longitudinal extent, this inclined surface has in this respect an extension component in the installed state downwards in the direction of the device carrier and outwardly away from the LED row. At the outside end of this inclined surface 133a, the locking element 133 has a latching surface 133b extending parallel to the printed circuit board 120 and thus in the installation position, the function of which is explained below.

The two further locking elements 134, 135 arranged on the middle surface of the middle latching element 133 on the downholder 130 are identical and aligned with respect to their oblique surfaces or latching surfaces which are not aligned in the figure and are arranged and aligned in the longitudinal direction alone with respect to those of the middle latching element 134 These can be omitted in an embodiment not shown.

The interaction of the holding devices respectively hold-down 130 with the diffuser 1, for its attachment is from the cross-sectional view of FIG. 3 as well as the related excerpt from the Fig. 4 out. Fig. 3 is a front view of the perspective view of FIG. 1 , while FIG. 4 increases the attachment of the diffuser 1 to the hold 130 shows.

In the installation position, the latching element 6a, 6b arranged on the inside of the lip 5a, 5b engages behind the associated latching elements 133 to 135 such that the latching surface 133b (see FIG FIG. 2 ) abuts against an associated, in the direction of the roof portion of the diffuser facing bearing surface 7a, 7b of the locking element 6a, 6b. The latching elements 6a, 6b extend over the entire length of the diffuser, in a corresponding manner the relevant latching surface 133b.

As in particular from FIG. 4 Removable, is in the engaged state of the locking element 6a, 6b of the lip 5a, 5b with the Detent element 133 of the blank holder 130 to the contact surface 7 a, 7 b opposite end face 9 a, 9 b of the locking element 6 a, 6 b on the equipment carrier 110 at. In this respect, an unintentional application of a force on the diffuser approximately perpendicular to the device carrier 110 can not lead to an unintentional release of the diffuser from the engagement with the holding devices or holding-down device 130.

As the expert further the enlarged view of FIG. 4 detects, in the described embodiment, an engagement of the diffuser 1 can be caused with the hold down 130 that the diffuser is horizontally aligned to the device carrier 110 and the hold 130 is fed to the hold-down. In this case, initially the bevels 8a, b of the locking elements 6a, 6b come into contact with the rigid inclined surfaces 133a of the hold-downs 130. Upon further aligned feeding of the diffuser in the direction of the device carrier 110, the bevels 8a, 8b continue to slide on the inclined surfaces 133a of the hold-down 133, whereby both locking elements 6a, 6b and thus both lips 5a, 5b are pressed resiliently outwards. Once the contact surfaces 7a, 7b below the locking surface 133b (see FIG. 2 ), the lips 5a, 5b snap inwards to lock the diffuser to the hold-downs.

The integrally formed, ie integrally formed with the rest of the diffuser and the incident or transmitting light scattering lips 5a, 5b surrounds extending inwardly the hold-down 130. In the cross-sectional view of Fig. 3 Conveniently, a connecting straight line (according to the illustrated dashed line K) between an LED and the free end of the lip 6a, 6b does not touch components within the diffuser, in particular not the hold-downs 130. In the embodiment described, this free radiation angle is approximately 120 ° and can be applied to the Be adapted radiation of the LEDs used.

Light reflected back into the diffuser cavity at the inside surface of the diffuser and light scattered back into the diffuser cavity within the wall of the diffuser falls at least partially directly or indirectly on the lips 5a, 5b. As a result, there is a whitening of the caused in particular by the holddown core shadow at the corresponding locations in the longitudinal extension of the assembly to which a hold-down is arranged in each case. Much of the light falling into the channel formed by the lip 5a and side legs 2A or lip 5b and side leg 2B and extending the entire length of the diffuser may contribute to the lightening of otherwise existing shadow areas. These grooves are each open towards the roof section 3 and in certain embodiments have a height h of at least 25% of the distance P of the LEDs to the inner surface of the roof section. The width of the channel at its opening directed towards the roof section may in certain embodiments be about 20% of the transverse extent of the diffuser.

In order to enhance the described effect of brightening has in the described embodiment of the diffuser in the roof area with respect to FIG. 1 described indentation, which is formed symmetrically to the LED row. Here, starting from the plane of symmetry S, which extends through the center of the bulge centrally through the LED row, at least two outwardly extending roof sections 3a, 3c and 3b, 3d designed, which is in its radius on the inner surface of these roof sections differ. To maintain a symmetrical light distribution behavior, the section surfaces 3a and 3b on the one hand and 3c and 3d on the other hand designed on the inside with the same radius of curvature in a defined manner, the rays there incident substantially to the light directed outwardly curved portions of the side legs 2A, 2B. Thus, on the one hand by a further reflection on the inside of these side leg portions, a light incident on the lips 5a, 5b are generated for brightening the shadow areas described.

In addition, a not insignificant proportion of transmission can be generated by the set targeted reflection of direct light of the LEDs on the roof section of the diffuser on the outwardly directed portions of the side legs 2A, 2B. After passing through the diffuser wall, this transmission component can at least partially leave the luminaire in a beam direction which intersects the circuit board plane and thus cause the generation of indirect light, for example on a ceiling above the luminaire.

FIG. 5 shows the in FIG. 1 shown assembly, extended by a support profile 200 to which the assembly according to FIG. 1 can be attached in a conventional manner. In this case, the support profile serves for a fastening of the entire assembly to a ceiling and on the other for receiving electrical and electronic components such as electrical supply elements, which are attached to the side facing away from the LED side of the device carrier side and into the support profile can extend.

As already indicated, on the inside of the roof section 3 of the diffuser 1 in the region of the indentation, starting from the middle of the indentation, ie from the lowest point on both sides apart from the in FIG. 1 designated center region D1 two further regions D2 and D3 set. Within these regions D2 and D3, a specific radius of curvature R1 or R2 is respectively designed on the inside of the diffuser, around the described reflections in the direction of the side leg 2B, respectively the channel formed by the side leg 2B and the lip 5b or ditch. The same geometric design on the inside of the indentation is to achieve a symmetrical light distribution on in the FIG. 5 realized on the right side of the indentation. Conveniently, the clear distance P to the center of the recess is more than 25 mm, in particular about 29 mm.

Advantageously, depending on the embodiment, the ratio of the transverse extent of the diffuser to the distance P can be about 1.8 to 2.4, in particular 2.2.

Conveniently, depending on the embodiment, the ratio of the optically effective height h of the lip 5a, b to the distance P is greater than 0.25, in particular> 0.3.

FIG. 6a shows one for using the in FIG. 5 illustrated assembly usable light grid 300 in a perspective exploded view showing the individual components. The grid comprises a rectangular housing frame 310, which has frontally supporting webs 311, 312, which is adapted to the roof shape of the diffuser. The housing frame 310 accommodates an insert 320 which, via its side face, has two side reflectors 330a, b, which extend obliquely outwards in the upper area facing the luminous means. Between the side reflectors extends in a, the light exit facing lower portion of the housing frame a plurality of longitudinally spaced and transversely extending transverse reflectors 340. The light grid 300 is provided with two respective two-piece retaining brackets 350 on the assembly according to FIG. 5 attached. FIG. 6a shows a composite light grid according to FIG. 6a in a sectional view perpendicular to the longitudinal extent of the upwardly and downwardly open housing frame 310th

The FIGS. 7a, 7b show in a simplified cross-sectional view the connection of an assembly according to Figure 5 with a light grid according to the FIGS. 6a , b. In this case, the two-part bracket 350 is formed, the assembly according to FIG. 5 completely enclose when placed on the light grid 300, the assembled state shows FIG. 7b , As can be seen, the diffuser 1 does not project completely into the housing frame of the light grid 300, so that both side legs 2a, 2b of the diffuser are exposed beyond the height F, and light can leave the assembly via these wall sections. For ease of illustration, the lip 5a, 5b is not shown, it lies above the Abstrahlkegels bounded by the dashed lines. Due to the above-described design of the diffuser in the roof area here is a not inconsiderable release of light in a direction that intersects with the board level, so even in the FIG. 7b shown assembly indirect light can be generated by radiation upward to the ceiling.

FIG. 8 shows in an end view perpendicular to the longitudinal axis of the design of another embodiment of a diffuser 1 ', which is identical to the diffuser 1 of the FIG. 1 is trained. Identical reference numerals correspondingly identify identical features of the two embodiments of the diffusers 1, 1 'described with reference to the figures. The diffuser 1 'of FIG. 8 differs from the diffuser 1 described above in that in each case at the free end of the side leg 2a, 2b, a web 13a, 13b is arranged, which in the indicated representation approximately vertically in the opposite direction to the roof portion 3 of the diffuser 1 '. ie away from this, extends. In the embodiment described, the web 13a, 13b is arranged in a curvature region at the free end of the respective side limb, to which the respective lip 5a, 5b subsequently adjoins in the further course. The webs 13a, 13b have a lying outside surface 16a, 16b, which impresses the overall appearance of the diffuser together with the outer lateral surface of the side legs 2a, 2b and the outer circumferential surface of the roof section 3.

How out FIG. 8 4, the latching elements 6a, b have an extension 10a, b extending approximately parallel to the web 13a, b of the respective side limb 2a, 2b, which, together with the transversely extending region or transverse section 11a, 11b, has an open channel 15a facing away from the roof section 3. b whose function is described below with reference to FIG. 9 is explained in more detail. Both the extensions 10a, 10b and the webs 13a, b have at their free end respective contact surfaces or stops 9a, b and 14a, b.

FIG. 9 shows the diffuser 1 'of FIG. 8 in the installed state accordingly FIG. 5 that is, together with other components of an assembly for an elongated LED light with a series of LEDs 121 which are arranged on a circuit board 100, wherein the diffuser 1 'cooperates by latching engagement with associated latching elements described above and 130. In the illustrated embodiment, both the web stops 14a, 14b and the stops 9a, 9b of the extension 10a, 10b of the locking element 6a, 6b abut the device carrier 110 in the installed state. To seal the space which is formed by the diffuser 1 'and the board 100 and the device carrier 110, two seals 17a, 17b are provided, each in a sealing channel 15a, b, see FIG. 8 , are arranged. The over the entire length of the diffuser 1 'extending seals 17a, 17b prevent the ingress of insects, moisture and / or dust in the interior of the diffuser.

In the FIG. 9 The assembly further shown with reference to FIG Fig. 2 already described frame 50 for lining up of two diffusers, so far as lights with basically any length extension or with any number of juxtaposed diffusers can be created.

LIST OF REFERENCE NUMBERS

1, 1 '

diffuser

2A, 2B

side leg

3

Roof legs, middle thighs

3a, b

roof section

3c, d

roof section

5a, 5b

lip

6a, 6b

locking element

7a, 7b

contact surface

8a, 8b

slope

9a, 9b

attack

10a, 10b

Extension of the locking element

11a, 11b

Curvature of field / cross section

13a, 13b

web

14a, 14b

bridge abutment

15a, 15b

channel

16a, 16b

viewing area

17a, 17b

poetry

50

frame

51

frame stay

52

flange

100

module

110

equipment rack

120

circuit board

121

LED

130

Stripper plate

131

screw

132

locking element

133

locking element

133a

sloping surface

133b

Rest area

134

locking element

135

locking element

200

support section

300

louvers

310

housing frame

311, 312

support web

320

commitment

330a, b

side reflector

340

transverse reflector

350

retaining clip

H

Light lip height

F

window

P

Distance LED diffuser

S

plane of symmetry

Claims (15)

1. Diffuser (1, 1') for an oblong luminaire, in particular for a LED luminaire with an in-line arrangement of LED, whereby the diffuser is substantially U-shaped in cross-section perpendicular to the longitudinal extension with two side legs (2A, B) and a roof section connecting the side legs, characterized in that a lip (5a, b) internal to the U-shape and extending towards the roof section is respectively molded on both side legs (2A, B) in the area of the free ends thereof for making available further optically active diffuser wall sections.
2. Diffuser (1, 1') according to claim 1, characterized in that both lips (5a, b) extend towards each other so that the distance between the lips decreases with increasing lip height.
3. Diffuser (1, 1') according to claim 1 or 2, characterized in that a lip (5a, b) forms a groove similar design respectively with an external side leg wall in transverse direction.
4. Diffuser (1, 1') according to claim 1, 2 or 3, characterized in that a side leg wall has a curvature portion or a horizontal portion extending inwards (11 a, 11 b) at the free end of the side leg, which portion is followed by the associated lip possibly by intercalating an intermediate portion extending transversely to the longitudinal extension.
5. Diffuser (1, 1') according to one of the claims 1 to 4, characterized in that the roof portion has an inward recess in cross-section perpendicular to the longitudinal extension.
6. Diffuser (1, 1') according to claim 5, characterized in that the inner side of the roof portion has a high-gloss surface in the area of the recess.
7. Diffuser (1, 1') according to one of the claims 1 to 6, characterized in that a fixing means is placed on the inner side of the lip (5a, b) for cooperating with a holding device of the luminaire.
8. Diffuser (1, 1') according to claim 7, characterized in that the fixing means is a longitudinally extending snap-in element (6a, b) molded on the inner side of the lip (5a, b) that comprises a control surface for guiding a snap-in cam and a contact surface (7a, b) for bearing on a snap-in surface of the snap-in cam.
9. Diffuser (1, 1') according to one of the claims 1 to 8, characterized in that one longitudinally extending web (13a, b) is placed respectively at the free end of the side legs (2A, B).
10. Diffuser (1, 1') according to claim 9, characterized in that the web (13a, b) cooperates at each of the side legs (2a, b) with the fixing means on the lip (5a, b) for forming side walls of a sealing channel (15a, b) in which a gasket (17a, b) can be received.
11. Component (100) for an oblong LED luminaire comprising:

    - a board (120) showing a geometric in-line arrangement of LED (121),

    - a multitude of holding devices (130) for fixing the board to a support such as an oblong equipment support or a luminaire housing, whereby holding devices (130) are placed in longitudinal direction on both sides of the LED;

    - a diffuser (1, 1') according to one of the claims 1 to 10, whereby the diffuser when mounted surrounds the holding device and a snap-in element of the holding device that is molded on the diffuser cooperates for holding the diffuser.
12. Component according to claim 11, characterized in that, when the diffuser (1, 1') is mounted, its lips (5a, b) extend in its height in direction of the roof portion beyond the holding devices.
13. Component according to claim 11 or 12, characterized in that the roof portion of the diffuser has an inward recess in cross-section perpendicular to its longitudinal extension and the depth of the recess is less than 12% of the clear height of the diffuser (1, 1').
14. Component according to claim 13, characterized in that radii of curvature on the inside of the diffuser (1, 1') are configured in the area of the recess of the roof portion in such a manner that the light emitted by one of the LED (121) in a cross-sectional plane on the inside of the diffuser (1, 1') is reflected as direct light into a side leg (2A, B).
15. Component according to one of the claims 11 to 14, characterized by an oblong light grid (300) with an upwards and downwards open grid housing when mounted that comprises a grid insert comprising two side reflectors (330a, b) spaced in transverse direction and extending obliquely upwards over the length of the component as well as a multitude of transverse reflectors (340) spaced in longitudinal direction, whereby the diffuser (1, 1') when mounted is placed between the two side reflectors (330a, b).

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