EP2895790A1 - 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

 Grid lamp with LED light sources

The invention relates to a grid lamp with LED light sources (LED: light-emitting diode).

Grid lights are known as such from the prior art. For example, DE 195 20 177 A1 shows an elongate grid lamp in which the grid element has two side reflectors which extend in the longitudinal direction of the lamp, as well as a plurality of transverse slats which extend transversely to the longitudinal direction between the two side reflectors. In this grid light is as a light source

Fluorescent tube provided. In the meantime, an LED-based louvre luminaire is already known. From DE 10 2010 062 454 AI such a lamp with a cell grid element is known, which forms several To freflektoren, each top reflector is associated with an LED.

In particular, if one replaces the fluorescent tube with a light source based on LED in a raster lamp, which has a conventional fluorescent tube as light source, there is the problem that the light emitted by the LEDs does not radiate to a considerable extent out of the light, but to structures of the grid lamp, in particular on the back surfaces of the cross blades of the

Grid element, which point towards the side of the LEDs, is reflected or absorbed and is no longer available to the light output of the lamp in the sequence. In other words, the efficiency of the light output is limited.

The invention is based on the object, a corresponding improved

Indicate LED-based louvre luminaire; In particular, the louver should have improved efficiency. This object is achieved according to the invention with the object mentioned in the independent claim. Particular embodiments of the invention are indicated in the dependent claims. According to the invention, a grid lamp is provided which has at least two LED light sources, and a grid element which extends along a longitudinal axis, wherein the grid element has at least three transverse reflector elements which extend transversely to the longitudinal axis and wherein by two adjacent transverse Reflector elements each have a Lichtlenkeinheit the raster element is limited. In this case, the raster lamp is designed such that each of the LED light sources is assigned to one of the light guide units. Furthermore, the grid lamp has an optical element which is formed independently of the grid element and which is configured and arranged such that it acts optically between the at least two LED light sources and the light guide units.

The optical element makes it possible to achieve that the light emitted by the LED light sources is directed in a particularly targeted manner to the respective light-directing units. This can increase the efficiency of the light output of the grid lamp. Preferably, the grid element has two, on the longitudinal axis extending side reflectors, wherein the transverse reflector elements are formed by cross blades, which are arranged connecting the two side reflectors. In this case, it can be prevented in particular with the optical element that a light emitted by one of the LED light sources strikes a back surface of a transverse lamella facing the relevant LED light source. The light can thus be used particularly effectively for the light output of the grid light.

Preferably, the optical element has at least two divergence space segments, each of the divergence space segments being bounded by inner surfaces extending divergently between one of the LED light sources and the light steering unit associated with the respective LED light source. This makes it possible to achieve that a light emitted by an LED light source is supplied to the associated light-directing unit with a particularly low loss. Preferably, the inner surfaces are designed at least partially reflective. A loss of light between the LED light sources and the light guide units can thereby be kept very low.

Preferably, the optical element has transverse limiting elements which extend transversely to the longitudinal axis, wherein a part of the inner surfaces of each divergence space segment is formed by the transverse limiting elements. Preferably, the optical element has a concavely curved or trough-shaped, profile-like formed carrier element which extends parallel to the longitudinal axis, wherein a further part of the inner surfaces of each divergence space segment is formed by the carrier element. By virtue of the profile-like carrier element, it is advantageously possible to form production side walls of the divergence space segments. In addition, it can be easily achieved by the carrier element that the divergence space segments are held together mechanically, so that the optical element as a whole, in itself stable unit can be formed. As a result, handling of the grid lamp is facilitated, in particular with respect to a mounting or replacement of the light source.

Preferably, the at least two LED light sources are arranged supported on the carrier element. This makes it possible to save a separate holding element for the LED light sources. Preferably, the grid lamp is designed such that viewed in a cross section, the carrier element extends on two opposite sides up to the two side reflectors. In this way, it can be achieved that the optical element can be brought into the intended position in a relative position relative to the grid element particularly easily during the assembly of the grid lamp. Further preferably, the raster element and the optical element are designed such that the optical element can be guided in a separated state from the raster element relative to the raster element parallel to the longitudinal axis guided by the two side reflectors. This can be achieved in particular that for the assembly optical element can be inserted guided from one end side into the grid element.

Preferably, the optical element further comprises a diffuser element optically operatively disposed between the LED light sources and the light directing units. In this way, it can be achieved that the light emitted by the LED light sources quasi in the form of dots appears to be distributed more uniformly when viewing the grid light, in particular when the diffuser element is concavely curved with respect to a side facing the LED light sources is. Preferably, for this purpose, the diffuser element is a film. The diffuser element may also be formed by a diffusing or by structuring scattering extrusion profile.

In addition, there is the possibility, without distinctive

Changes in the emission characteristics to replace LEDs, if this makes sense for cost or efficiency reasons.

The invention is explained in more detail below with reference to an embodiment and with reference to the drawings. Show it:

Fig. 1 is a perspective sketch of a grid element and a

 optical element of a raster lamp according to the invention,

2 shows a cross section through the grid lamp,

3 shows a longitudinal section through a longitudinal section of the grid lamp,

Fig. 4 is a of FIG. 1 corresponding sketch of obliquely above and

5 is a sketch of a view obliquely from below into a Lichtlenkeinheit of

Grid element, facing the diffuser element 1 shows a perspective sketch of a raster element 3 and an optical element 6 of a luminaire according to the invention. The raster element 3 is generally oblong and extends along a longitudinal axis L. In FIG. 1, only a part of the raster element 3 is sketched, specifically with respect to the longitudinal axis L, only a longitudinal section of the raster element 3. The same applies analogously to the representation of the optical element 6th

In Fig. 2, the grid lamp is sketched in a section normal to the longitudinal axis L or in a cross section. In particular, the louvre luminaire may have a luminaire housing 10 in which the grid element 3 is arranged, wherein preferably also the luminaire housing 10 or the entire grid light is oblong and extends along the longitudinal axis L. The grid lamp may be a recessed luminaire, in particular a recessed ceiling luminaire.

In Fig. 3 is a longitudinal section through a longitudinal portion of the grid lamp is sketched. As a light source, the grid lamp at least two LED light sources 2, 2 ^' on. The raster luminaire is designed in such a way that a light emitted by the LED light sources 2, 2 'leaves the luminaire, in particular by means of a light source

Luminaire housing 10 formed light exit opening 12 of the grid lamp.

In the present description, it is assumed that the grid lamp is oriented relative to the vertical, that a discharge of the light is provided down, so the light exit opening 12 of the lamp housing 10 facing downward, as shown in Figures 1 to 3 by an arrow u indicated. In principle, the grid lamp can also be provided differently oriented. In such a case, the directions etc. are to be reinterpreted accordingly.

As shown in FIG. 1, the grid element 3 has transverse reflector elements 4 which extend transversely to the longitudinal axis L, wherein a respective light guide unit 5 of the grid element 3 is delimited by two adjacent transverse reflector elements 4. Overall, the grid element 3 has at least three transverse reflector elements 4, so that at least two light guide units 5 are formed. Preferably, however, significantly more transverse reflector elements 4 or light-guiding units 5 are provided, For example, at least six or at least ten Lichtlenkeinheiten 5, which are formed in a row along the longitudinal axis L.

The sketched in Fig. 3 longitudinal portion of the grid lamp comprises three

Light steering 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 grid lamp is designed so that each of the LED light sources 2, 2 ^' is assigned to exactly one of the light guide units 5. As in that shown in Fig. 2

Cross-section indicated, an LED light source 2 may comprise at least two LEDs 21, 22, which are arranged in particular on at least one circuit board 13.

Each light guide unit 5 is preferably designed to be closed annularly in a horizontal section, so that a light inlet opening or upper opening of the light guide unit 5 is formed due to the ring shape and a

Light exit opening or lower opening. The design is such that one of the LED light source 2, 2 ^' radiated light through the

 Light entrance opening of the light guide unit 5 enters the latter and through the

Leaves the light exit opening again and leaves the louvre in an order in an outer space. In the example shown, the grid element 3 has two, along the longitudinal axis L extending side reflectors 31, 32 and the transverse reflector elements 4 are formed by transverse lamellae 33 which are arranged connecting the two side reflectors 31, 32. Such a raster element 3 is known as such from the prior art. In Fig. 4, a perspective view corresponding to FIG. 1 is sketched at an angle obliquely from above. It can be seen that the transverse lamellae 33 have a back surface 331 on their side pointing toward the LED light sources 2, 2 'or on their upward-facing side and - as indicated in FIG. 3 - two main surfaces 332, 333. Each Lichtlenkeinheit 5 is thus through a main surface 332nd a first transverse lamella and a main surface 333 of an adjacent to the first transverse lamella, second transverse lamella bounded in the longitudinal direction.

The raster lamp further comprises an optical element 6, which is formed independently of the raster element 3 and which is configured and arranged such that it acts optically between the LED light sources 2, 2 and the light guide units 5. As a result, a light emitted by the LED light sources 2, 2 'can be supplied to the respective light guide units 5 in a particularly effective manner, so that the efficiency of the grid light is increased. In particular, for this purpose, the optical element 6 is designed such that a of one of the LED light sources 2, 2 'emitted light is only in the, the relevant LED light source 2, 2' associated light-deflecting element 5 is irradiated.

In particular, the optical element 6 may have divergence space segments 7, wherein preferably each of the divergence space segments 7 is assigned to exactly one of the LED light sources 2, 2 '. Each divergence space segment 7 is through

Inner surfaces 71, 72, 73, 74 limited, extending divergently between the respective LED light source 2, 2 ^' and the respectively corresponding associated Lichtlenkeinheit. The divergence space segments 7 can thus be designed quasi funnel-shaped, wherein an LED light source 2, 2 'is arranged on or in the smaller or upper funnel opening and the larger or lower

Funnel opening to the respective light guide unit 5 points. Preferably, the larger funnel opening is designed such that it corresponds in shape and size of the upper opening or light inlet opening of the relevant light guide unit 5. In this way, it can be achieved that particularly little light of the LED light source 2, 2 is lost for the radiation of the grid lamp.

In particular, light mixing chambers or light chambers can be formed by the divergence space segments 7.

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

For example, as shown by way of example in FIG. 3, the optical element 6 preferably further comprises transverse limiting elements 8 which extend transversely to the longitudinal axis L, wherein a part of the inner surfaces, namely two transversely to the longitudinal axis transverse inner surfaces 73, 74 of each divergence Room segment 7 are formed by the transverse boundary elements 8. The transverse limiting elements 8 may advantageously be formed as planar elements, which are inclined with respect to the vertical, for example, between 30 ° and 60 ° inclined oriented oriented manufacturing technology. Preferably, the transverse limiting elements 8 are designed such that the transverse inner surfaces 73, 74 formed by them extend up to the upper edges of those main surfaces 332, 333, by which the relevant light-guiding unit 5 is limited in the longitudinal direction. In this way, it is possible to prevent a light emitted by the LED light sources 2, 2 'from striking a back surface 331 of a transverse lamella 33.

At the top, the transverse limiting elements 8 preferably extend up to the height of the relevant LED light source 2, 2 ^' , or to the LEDs 21, 22 of the relevant LED light source 2, 2 ^' .

The optical element 6 preferably also has a concavely shaped channel-shaped, profiled carrier element 9 which extends parallel to the longitudinal axis L, wherein a further part of the inner surfaces namely two longitudinal inner surfaces 71, 72 of each extending longitudinally to the longitudinal axis L Divergence space segment 7 is formed by the carrier element 9. By the support member 9, the optical element 6 can be advantageously designed as a stable unit. For this purpose, the transverse boundary elements 8 and / or the LED light sources 2, 2 ^'

preferably arranged supported on the support element 9. In particular, the at least one circuit board 13 may be supported on the carrier element 9. Preferably, the carrier element 9 is formed from one piece, so that manufacturing technology advantageously the two longitudinal inner surfaces 71, 72 of all divergence-space segments 7 are formed by only one component. As can be seen by way of example from FIG. 2, the carrier element 8 is preferably designed in such a way that it extends on two opposite sides as far as the side reflectors 31, 32. In the example shown, the design is such that the

Side reflectors 31, 32 extend further upward than the transverse fins 33. The

In this case, the design is furthermore preferably such that the optical element 6 can be guided guided by the two side reflectors 31, 32 in a state separated relative to the raster element 3, parallel to the longitudinal axis L, from the raster element 3. The side reflectors 31, 32 form in this case, so to speak

Guide rail for the optical element 6.

This is for example of particular advantage when the light source of

Grid lamp to be replaced. In particular, in the case of a corresponding grid lamp which has a traditional fluorescent tube as the light source, it can be replaced particularly easily by a corresponding module comprising the optical element 6 and the LED light sources 2, 2 '. The module thus formed can be easily inserted into the front side of the raster element 3 and then electrically connect accordingly. The module may in particular consist of the grid element 6 and the LED light sources 2, 2 '.

Further preferably, the optical element 6 also has a diffuser element 11, which is optically effective between the LED light sources 2, 2 'and the

Light guide units 5 is arranged. Preferably, the diffuser element 11 is concavely curved with respect to a, the LED light sources 2, 2 'side facing. By means of the diffuser element 11, the light emitted by the LED light sources 2, 2 ', typically quasi in the form of dots, can be distributed in such a way that it is distributed more homogeneously from the outside when the raster lamp is viewed

Color mixing, dazzling effect and the danger of formation of

Multiple shading appears on the work surfaces.

5 shows a sketched view obliquely from below into a light-directing unit 5 of the raster element 3, with a view 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 supported on the carrier element 9.

Further preferably, the diffuser element 11 consists of one piece. Due to the design of the optical element 6, LED light sources of different designs can be incorporated in the divergence space segments 7 in a particularly flexible manner. Also, the diffuser element 11 can be particularly advantageous from different types of diffuser elements select. A raster lamp according to the invention is particularly suitable as a lamp that can deliver a high amount of light, in particular as a workstation-compatible lamp with small Lichtaustrittsfiäche, so that ausblendende reflectors are required in multiple arrangements or a lighting grid.

Claims

Expectations Grid light, having - at least two LED light sources (2, 2 ^' ), - a grid element (3) which extends along a longitudinal axis (L), the grid element (3) having at least three transverse reflector elements (4) which extend transversely to the longitudinal axis (L), one each through two adjacent transverse reflector elements (4). Light steering unit (5) of the grid element (3) is limited, wherein the grid light is designed in such a way that each of the LED light sources (2, 2 ^' ) is each assigned to one of the light control units (5), characterized, that the grid light further has an optical element (6) which is designed independently of the grid element (3) and in such a way is designed and arranged so that it acts optically between the at least two LED light sources (2, 2 ^' ) and the light directing units (5). Grid light according to claim 1, where the grid element (3) has two side reflectors (31, 32) extending along the longitudinal axis (L) and the transverse reflector elements (4) are formed by transverse slats (33) which are arranged connecting the two side reflectors (31, 32). Grid light according to claim 1 or 2, in which the optical element (6) has at least two divergence space segments (7), each of the divergence space segments (7) being delimited by inner surfaces (71, 72, 73, 74), each of which is between one of the LED light sources (2, 2 ^' ) and the one assigned to the relevant LED light source (2, 2 ^' ). Light control unit (5) extend divergently. Grid light according to claim 3, in which the inner surfaces (71, 72, 73, 74) are designed to be at least partially reflective. Grid light according to claim 3 or 4, where the optical element (6) has transverse boundary elements (8) which extend transversely to the longitudinal axis (L), part of the inner surfaces (73, 74) of each divergence space segment (7) through the transverse limiting elements (8) is formed Grid light according to one of claims 3 to 5, in which the optical element (6) has a concavely curved or trough-shaped, profile-like carrier element (9) which extends parallel to the longitudinal axis (L), with a further part of the inner surfaces (71, 72) of each divergence space segment (7) is formed by the carrier element (9). Grid light according to claim 6, in which the at least two LED light sources (2, 2 ^' ) are held on the support element (9) is arranged. Grid light with the features mentioned in claims 2 and 6 or 2 and 7, in which the support element (8), viewed in a cross section, extends on two opposite sides up to the two side reflectors (31, 32). Grid light according to claim 8, in which the grid element (3) and the optical element (6) are designed such that the optical element (6) is in a state separated from the grid element (3) relative to the grid element (3) parallel to the longitudinal axis (L ) can be moved guided by the two side reflectors (31, 32). 10. Grid light according to one of the preceding claims, in which the optical element (6) further has a diffuser element (11) which is optically effective between the LED light sources (2, 2 ') and the Light steering units (5) is arranged. 11. Grid light according to claim 10, in which the diffuser element (11) is concavely curved with respect to a side facing the LED light sources (2, 2 '). 12. Grid light according to claim 10 or 11, in which the diffuser element (11) is a film or a diffuse extrusion profile or one that scatters through structuring.