CN104603523A - Louver luminaire having led light sources - Google Patents

Abstract

The invention relates to a louver luminaire, which has at least two LED light sources (2, 2'), and a louver element, which extends along a longitudinal axis (L), wherein the louver element has at least three transverse reflector elements (4), which extend perpendicularly to the longitudinal axis (L), and wherein each pair of adjacent transverse reflector elements (4) bounds a light-directing unit (5) of the louver element. The louver luminaire is designed in such a way that each of the LED light sources (2, 2') is associated with one of the light-directing units (5). Furthermore, the louver luminaire has an optical element, which is independent of the louver element and which is designed and arranged in such a way that the optical element is optically effective between the at least two LED light sources (2, 2') and the light-directing units (5). By means of the optical element, the light emitted by the LED light sources (2, 2') can be guided to the respective light-directing units in an especially well-directed manner. Thus the efficiency of the light emission of the louver luminaire can be increased.

Description

Grille lighting with LED light source

The invention relates to a grille lighting with an LED light source (LED: Light Emitting Diode).

Grille lights are known per se from the prior art. For example, DE 195 20 177 A1 discloses an elongated grille light, wherein the grille element comprises two side reflectors extending in the longitudinal direction of the light and A plurality of transverse laminae extending transversely with respect to the longitudinal direction therebetween. In the grille lighting, a fluorescent tube is provided as a light source.

Meanwhile, an LED-based grille light has been disclosed. DE 10 2010 062 454 A1 already discloses such a luminaire having a honeycomb grid element forming a plurality of cup reflectors, wherein each cup reflector is assigned an LED.

Especially in grill lighting comprising a conventional fluorescent tube as light source, if the fluorescent tube is replaced by an LED-based light source, the problem arises that a relatively large proportion of the light emitted by these LEDs does not radiate out of the The light is instead reflected or absorbed at the structure of the grille light, in particular at the rear surface of the lateral sheet of the grille light on the side facing the LEDs, and is therefore no longer available for the light. light emission. In other words, the efficiency of light emission is limited in this case.

The object on which the present invention is based is to define a correspondingly improved LED-based grille lighting, which in particular is intended to have improved efficiency.

This object is achieved according to the invention by the subject-matter mentioned in the independent claims. Particular types of embodiments of the invention are described in the dependent claims.

The present invention provides a grille lighting comprising at least two LED light sources and a grille element extending along a longitudinal axis, wherein the grille element comprises transverse Extending at least three transverse reflector elements, and wherein two adjacent transverse reflector elements in each case delimit a light-guiding unit of the grid element. In this case, the grille lighting is designed such that the LED light sources are each correspondingly assigned to one of the light-guiding units. The grille lighting furthermore comprises an optical element which is presented independently of the grille element and which is configured and arranged such that the optical element has an optical effect between the at least two LED light sources and the light guiding units .

What can be achieved by the optical element is that the light emitted by the LED light sources is guided in a particularly targeted manner to the corresponding light guiding unit. As a result, the luminous efficiency of the grille light can be improved.

Preferably, the grid element comprises two lateral reflectors extending along the longitudinal axis, wherein the lateral reflector elements are formed by lateral lamellae arranged in such a way as to connect the two lateral reflectors. In this case, the optical element makes it possible in particular to prevent the light emitted by one of the LED light sources from impinging on the rear surface of a transverse sheet facing the associated LED light source. Light can thus be used particularly efficiently for the light emission of the grille light.

Preferably, the optical element comprises at least two diverging space segments, wherein each diverging space segment is formed by in each case between one of the LED light sources and the light-guiding unit designated for the associated LED light source Bounded by multiple inner surfaces that extend divergently. As a result, it is possible to feed the light emitted by an LED light source to the assigned light-guiding unit with particularly low losses.

Preferably, in this case the inner surfaces are designed to be at least partially reflective. As a result, light losses between the LED light sources and the light-guiding units can be kept particularly low.

Preferably, the optical element comprises transverse delimiting elements extending transversely with respect to the longitudinal axis, wherein part of the inner surfaces of the respective diverging space segments are formed by the transverse delimiting elements.

Preferably, the optical element comprises a concavely curved or groove-shaped carrier element which is formed in a profile-like manner and extends parallel to the longitudinal axis, wherein the inner surfaces of the respective diverging space sections Another part of the carrier element is formed. The channel-shaped carrier element makes it possible to form the lateral inner walls of the diverging space sections advantageously in terms of production engineering. Furthermore, the carrier element makes it possible to mechanically hold the diverging space sections together in a simple manner so that the optical element as a whole can be embodied as an inherently stable structural unit. This facilitates the handling of the grille light, especially with regard to the installation or replacement of the light source.

Preferably, the at least two LED light sources are arranged mounted on the carrier element. As a result, a separate holding element for these LED light sources can be dispensed with.

Preferably, the grille lighting is designed such that the carrier element extends as far as the two side reflectors at two opposite sides as seen in a cross section. As a result, it can be achieved in a particularly simple manner that the optical element can be brought into a predetermined relative position relative to the grille element during installation of the grille light. Further preferably, in this case, the grid element and the optical element are designed such that the optical element in the separated state from the grid element can be guided by the two side reflectors to communicate with The longitudinal axis moves parallel to the grid element. As a result it can be realized in particular that the optical element can be inserted into the grid element in a guided manner from one end side for assembly purposes.

Preferably, the optical element furthermore comprises a diffuser element arranged optically effectively between the LED light sources and the light guiding units. As a result it can be achieved that the light emitted by the LED light sources in almost point-like form appears to be distributed more evenly when the grille lighting is viewed from the outside, especially if in this case the diffuser element is facing towards the LED light sources. This is the case when one side is concavely curved. Preferably, for this purpose, the diffuser element is a membrane. The diffuser element can also be formed from a diffusing extruded profile or an extruded profile that diffuses due to construction.

Furthermore, this configuration offers the possibility to replace the LED without significantly changing the emission characteristics, should this appear to be expedient for cost or efficiency reasons.

The invention will be explained in more detail below based on an exemplary embodiment and with reference to the accompanying drawings, in which:

Figure 1 shows a schematic perspective view of a grille element and an optical element of a grille lighting according to the invention,

Figure 2 shows a section through the grille lighting,

Figure 3 shows a longitudinal section through a longitudinal section of the grille lighting,

FIG. 4 shows a diagram corresponding to FIG. 1 obliquely from above and

Figure 5 shows a schematic view of the diffuser element seen obliquely from below into a light guiding unit of the grid element

FIG. 1 shows a schematic perspective view of a grid element 3 and an optical element 6 relating to a lighting lamp according to the invention. The grid element 3 is generally elongate and extends along a longitudinal axis L. As shown in FIG. FIG. 1 schematically depicts only a part of the grating element 3 , ie only one longitudinal section of the grating element 3 relative to the longitudinal axis L . The same applies analogously to the representation of the optical element 6 .

FIG. 2 schematically depicts the grille lighting in a sectional view perpendicular to the longitudinal axis L or in a cross section. The grille light may specifically comprise a light housing 10 in which the grille element 3 is arranged, wherein preferably the light housing 10 or the entire grille light is also elongated and along the A longitudinal axis L extends. The grid light can be a recessed light, in particular a recessed ceiling light.

Figure 3 schematically depicts a longitudinal section through a longitudinal section of the grille lighting. The grille lighting comprises at least two LED light sources 2, 2' as light sources. The grille lighting is designed such that the light emitted by the LED light sources 2, 2' leaves the lighting, that is to say in particular passes through a light exit opening 12 of the grille lighting formed in the housing of the lighting 10 in.

In this specification, it is assumed that the grille lighting is oriented downwards with respect to the vertical direction to provide emitted light, that is to say the light exit opening 12 of the lighting housing 10 faces downwards, as in FIGS. 1 to 3 . as indicated by the arrow u. In principle, the grille light can also be provided in a different orientation. In such a case, these direction indications and the like should be reinterpreted accordingly.

As shown in FIG. 1 , the grid element 3 comprises a plurality of transverse reflector elements 4 extending transversely with respect to the longitudinal axis L, wherein two adjacent transverse reflector elements 4 in each case delimit the grid element 3 A light guide unit 5. Overall, the grid element 3 comprises at least three transverse reflector elements 4 forming at least two light guiding units 5 . However, preferably substantially more transverse reflector elements 4 and corresponding light guiding units 5 are provided, for example at least six or at least ten light guiding units 5 formed in series along the longitudinal axis L.

The longitudinal section of the grille light as schematically depicted in FIG. 3 comprises three light guiding units 5 .

The distance between two transverse reflector elements 4 along the longitudinal axis L may for example be between 30 mm and 100 mm, preferably between 40 mm and 80 mm.

The grille lighting is designed such that the LED light sources 2, 2' are assigned to exactly one of the light-guiding units 5, respectively. As indicated in the cross-section shown in FIG. 2 , one LED light source 2 may in this case comprise at least two LEDs 21 , 22 which are in particular arranged on at least one circuit board 13 .

Each light guide unit 5 is preferably implemented such that the light guide unit is closed in an annular manner in a horizontal cross-sectional view, so that a light inlet opening or upper part of the light guide unit 5 is formed due to the annular shape opening and a light exit or lower opening. In this case, the design is such that the light emitted by the associated LED light source 2, 2' enters the light guide unit 5 through its light entry opening and exits again through the light exit opening and thus the grid lighting The light enters an exterior space.

In the example shown, the grid element 3 comprises two lateral reflectors 31, 32 extending along the longitudinal axis L, and the lateral reflector elements 4 are formed to connect the two lateral reflectors 31, 32. Formed by a plurality of transverse sheets 33 arranged in a manner. Such a grid element 3 is known per se from the prior art. FIG. 4 schematically depicts a schematic perspective view corresponding to FIG. 1 in a view obliquely from above. It is evident that the transverse lamellae 33 have a rear surface 331 and in each case two main surfaces 332, 333 ( as indicated in Figure 3). Each light guiding unit 5 is thus delimited by a main surface 332 of a first transverse lamellae and a main surface 333 of a second transverse lamella adjacent to the first transverse lamellae in the longitudinal direction.

The grille lighting also comprises an optical element 6 which is presented independently of the grille element 3 and which is configured and arranged such that it is between the LED light sources 2 , 2 ′ and the light guiding units 5 With optical effect. As a result, the light emitted by the LED light sources 2, 2' can be fed particularly efficiently to the corresponding light guide unit 5, so that the efficiency of the grille lighting is increased. In particular, for this purpose the optical element 6 is designed such that the light emitted by one of these LED light sources 2, 2' is radiated only into the light guiding element 5 designated for this associated LED light source 2, 2' .

In particular, the optical element 6 can comprise a plurality of diverging space segments 7, wherein preferably each of these diverging space segments 7 is assigned to exactly one of the LED light sources 2, 2'. Each diverging space segment 7 is delimited by a plurality of inner surfaces 71, 72, 73, 74 extending divergently between the associated LED light source 2, 2' These divergent space sections 7 can thus be designed almost in a funnel-shaped manner, wherein an LED light source 2, 2' is arranged at or in the smaller or upper funnel opening and the larger or lower funnel opening Facing the associated light guiding unit 5 . Preferably, the larger funnel opening is designed such that it corresponds in terms of its shape and size to the upper opening or light inlet opening of the associated light guiding unit 5 . What can be achieved in this way is that particularly little light of the LED light sources 2, 2' is lost for the illumination from the grille lighting.

In particular, a plurality of light mixing chambers or light chambers can be formed from these diverging space sections 7 .

Particularly little light is lost if these inner surfaces 71 , 72 , 73 , 74 are designed to be at least partially reflective, in particular highly reflective. Preferably, all these inner surfaces 71, 72, 73, 74 are designed to be reflective. For this purpose, the inner walls 71 , 72 , 73 , 74 can be designed, for example, white, or as reflective aluminum surfaces.

As shown by way of example in FIG. 3 , for example, the optical element 6 preferably also comprises a plurality of transverse delimiting elements 8 extending transversely with respect to the longitudinal axis L, wherein the inner surfaces of the respective diverging space segments 7 A part, namely the two transverse inner surfaces 73 , 74 extending transversely with respect to the longitudinal axis, is formed by these transverse delimiting elements 8 . In terms of production engineering, the lateral delimiting elements 8 can advantageously be embodied as planar elements arranged such that they are oriented obliquely with respect to the vertical, for example at 30° and 60°. Preferably, the lateral delimiting elements 8 are designed such that the lateral inner surfaces 73 , 74 formed by them extend up to the upper edge of the main surfaces 332 , 333 delimiting the associated light guiding unit 5 in the longitudinal direction. In this way, it is possible to prevent the light emitted by the LED light sources 2, 2' from impinging on a rear surface 331 of a transverse sheet 33.

These lateral delimiting elements 8 extend upwards, preferably up to the height of the associated LED light source 2, 2', or to the LEDs 21, 22 of the associated LED light source 2, 2'.

The optical element 6 preferably additionally comprises a concavely curved or groove-shaped carrier element 9 which is formed in a profile-like manner and extends parallel to the longitudinal axis L, wherein the respective diverging space sections 7 The other part of the inner surface, namely the two longitudinal inner surfaces 71 , 72 extending longitudinally with respect to the longitudinal axis L, is formed by the carrier element 9 . With the aid of the carrier element 9 the optical element 6 can advantageously be designed as a stable structural unit. For this purpose, the lateral delimiting elements 8 and/or the LED light sources 2, 2' are preferably arranged in such a way that they are mounted on a carrier element 9. In particular, the at least one circuit board 13 can be mounted on the carrier element 9 . Preferably, the carrier element 9 is formed in one piece so that the two longitudinal inner surfaces 71 , 72 of all the diverging space sections 7 are advantageously made of only one part in terms of production engineering Forming.

As presented in an exemplary manner from FIG. 2 , the carrier element 8 is preferably designed such that it extends as far as the lateral reflectors 31 , 32 on two opposite sides. In the example shown, the design is such that the side reflectors 31 , 32 extend further upwards than the transverse lamellae 33 . In this case, the design is also preferably such that the optical element 6 in the separated state from the grid element 3 can be guided parallel to the longitudinal axis relative to the The grid element 3 moves. In this case, these side reflectors 31 , 32 are formed like guide rails for the optical element 6 .

This is particularly advantageous, for example, when the light source of the grille lighting is intended to be replaced. In particular, in the case of a corresponding grid lighting comprising a conventional fluorescent tube as light source, it can be replaced particularly simply by a corresponding module comprising the optical element 6 and the LED light sources 2, 2' The fluorescent tube. In this case, the modules thus formed can be easily inserted into the grating element 3 on the end side and then correspondingly connected electrically. In this case, the module may in particular consist of the grid element 6 and the LED light sources 2, 2'.

Further preferably, the optical element 6 additionally comprises a diffuser element 11 which is arranged optically effectively between the LED light sources 2, 2' and the light guiding units 5. Preferably, in this case the diffuser element 11 is concavely curved with respect to the side facing the LED light sources 2, 2'. Through the diffuser element 11, the light emitted by these typically almost point-shaped LED light sources 2, 2' can be distributed in such a way that when the grille lighting is viewed from the outside, the light Blending, glare effects, and the risk of multiple shadows on the work surface appear to be more evenly distributed.

FIG. 5 shows a view of a light guide unit 5 obliquely looking at the grid element 3 from below with a schematic depiction of the diffuser element 11 .

The diffuser element 11 may be formed in the form of a diffuser film. Preferably, the diffuser element 11 is mounted on the carrier element 9 . Further preferably, the diffuser element 11 consists of one piece.

This design of the optical element 6 enables a particularly flexible introduction in terms of design of LED light sources of different designs into these diverging space sections 7 . The diffuser element 11 can likewise be selected particularly advantageously from different types of diffuser elements.

The grille light according to the invention is particularly suitable as a light which emits high-quality light, in particular as a light which is suitable for display workstations and which has a small light exit surface so that multiple arrangements or multiple lights in one grille light have to be concealed. Reflector lighting.

Claims (12)

1. A grill lighting, comprising - at least two LED light sources (2, 2'), - a grid element (3) extending along a longitudinal axis (L), wherein the grid element (3) comprises at least three transverse reflector elements (4) extending transversely with respect to the longitudinal axis (L), wherein two adjacent transverse reflector elements (4) in each case delimit a light-guiding unit (5) of the grid element (3), wherein the grille lighting is designed such that the LED light sources (2, 2') are each correspondingly assigned to one of the light guiding units (5), It is characterized in that, The grille lighting additionally comprises an optical element (6) which is presented independently of the grille element (3) and which is configured and arranged such that the optical element is positioned between the at least two LED light sources (2, 2 ') and these light guiding units (5) have an optical effect. 2. The grille lighting lamp of claim 1, Wherein the grid element (3) comprises two side reflectors (31, 32) extending along the longitudinal axis (L), and the transverse reflector elements (4) are formed by connecting the two side reflectors A plurality of transverse laminae (33) arranged in a manner (31, 32). 3. The grille lighting lamp as claimed in claim 1 or 2, wherein the optical element (6) comprises at least two diverging space segments (7), wherein each diverging space segment (7) is produced by in each case one of the LED light sources (2, 2') Delimited by a plurality of inner surfaces (71, 72, 73, 74) extending divergently between the light guiding unit (5) designated for the associated LED light source (2, 2'). 4. A grille lighting lamp as claimed in claim 3, Wherein these inner surfaces (71, 72, 73, 74) are designed to be at least partially reflective. 5. A grille lighting lamp as claimed in claim 3 or 4, wherein the optical element (6) comprises laterally delimiting elements (8) extending transversely with respect to the longitudinal axis (L), wherein a portion (73, 74) of the inner surfaces of each diverging space segment (7) is Formed by these lateral delimiting elements (8). 6. A grille lighting lamp as claimed in any one of claims 3 to 5, Wherein the optical element (6) comprises a concavely curved or grooved carrier element (9), which is formed in a profile-like manner and extends parallel to the longitudinal axis (L), wherein each diverging Another part (71, 72) of the inner surfaces of the space section (7) is formed by the carrier element (9). 7. A grille lighting lamp as claimed in claim 6, Wherein the at least two LED light sources (2, 2') are arranged in a manner mounted on the carrier element (9). 8. A grille lighting having the features mentioned in claims 2 and 6 or 2 and 7, Therein the carrier element (8) extends as far as the two side reflectors (31, 32) on two opposite sides as seen in a cross section. 9. A grille lighting lamp as claimed in claim 8, Wherein the grid element (3) and the optical element (6) are designed so that the optical element (6) in a state separated from the grid element (3) can pass through the two side reflectors (31 , 32) to move relative to the grid element (3) parallel to the longitudinal axis (L) in a guided manner. 10. A grille lighting lamp as claimed in any one of the preceding claims, Wherein the optical element (6) further comprises a diffuser element (11) which is optically effectively arranged between the LED light sources (2, 2') and the light guiding units (5). 11. The grille lighting lamp of claim 10, Wherein the diffuser element (11) is concavely curved with respect to the side facing the LED light sources (2, 2'). 12. A grille lighting lamp as claimed in claim 10 or 11, The diffuser element ( 11 ) is here a film or a diffusing extruded profile or extruded profile which diffuses due to its construction.