EP2644982B1 - Light emitting assembly - Google Patents

Description

The present invention relates to an arrangement for emitting light with at least one LED light source and a diffuser arranged in the light emission direction in front of the LED light source, wherein the light emission of the arrangement takes place via the diffuser.

In the case of elongated luminaires or arrangements for emitting light, which are used, for example, in the commercial sector, fluorescent lamps have hitherto frequently been used as light sources. The progressive development of LEDs now leads more and more to the fact that, for example, fluorescent lamps are replaced by corresponding LEDs. This results, on the one hand, from the fact that LED light sources have considerable advantages in terms of lifetime and energy efficiency compared to conventional light sources. On the other hand, the luminous intensity achievable with the help of LEDs is now sufficiently high that LED light sources can easily replace conventional light sources such as fluorescent lamps.

From the American patent application US 2006/0245173 A1 For example, an arrangement for emitting light is known to find use in the LEDs.

Furthermore, the use of LED light sources is carried out, for example, already in the so-called Slotlight lamp of the Applicant, which is an elongated lamp, via which a diffuse light emission takes place in order to create a uniformly brightened light band. In FIG. 1 is an example of a possible embodiment of such a slotlight lamp 1 shown in cross section, wherein the lamp 1 has an elongate housing 6 with a light exit opening. At the light exit opening a diffuser 3 is arranged, which closes the light exit opening. Accordingly, the light output of the lamp 1 via the diffuser 3rd

In the housing 6 of the lamp 1, an LED light source 2 is further provided, which is placed in the housing 6 such that the diffuser 3 substantially in Light emission direction in front of the LED light source 2 is located. In order to ensure that the greatest possible part of the light emitted by the LED light source 2 hits the diffuser 3 fairly uniformly, a reflector 5 is also provided, which has two reflector wings 7 arranged laterally on the inside of the housing 6 the two reflector wings 7 are located substantially between the LED light source 2 and the diffuser 3. By this reflector wing 7 ensures that a majority of the light emitted from the LED light source 2 is directed to the diffuser 3, as well as the light emitted from the LED light source 2, which is not directly blasted in the direction of the diffuser 3, by Multiple reflections can be directed to the reflector wings 7 in the direction of the diffuser 3.

In order to achieve the highest possible efficiency or high efficiency of the luminaire 1, however, it is necessary for the reflector vanes 7 to have the highest possible reflector material in order to have the best possible reflection properties.

Furthermore, it is useful in the use of LED light sources and also necessary to prevent accidental contact with the electrical components, in particular the LED board.

This is in the in FIG. 1 shown lamp 1 in the housing 6 additionally provided a transparent plate 4, which is arranged between the LED light source 2 and the diffuser 3. Through this it is achieved that even after the removal of the diffuser 3, a corresponding contact protection for the LED light source 2 is given. At the in FIG. 1 shown lamp 1 is provided that the transparent plate 4 is held by the reflector 5. The reflector 5 is in this case substantially U-shaped, wherein the LED light source 2 is arranged centrally within the U-shape and the opening of the U-shape in the direction of the diffuser 3 shows. The reflector wings 7, which form the wings of the U-shape, are slightly curved in this case and connected to each other via a central region of the U-shape, wherein in the reflector wings 7 in the vicinity of the central region corresponding recesses or recesses are provided, in each case the ends of the transparent plate 4 are arranged, whereby the transparent plate 4 is held by the reflector 5.

As already explained, at the in FIG. 1 1, a not inconsiderable part of the light emitted by the LED light source 2 is directed by multiple reflection on the reflector wings 7 in the direction of the diffuser 3, which is why even despite the selection of a correspondingly high-quality reflector material only a certain efficiency or a certain efficiency can be achieved ,

The present invention is accordingly based on the object of further developing the arrangement outlined above for emitting light such that the efficiency or the efficiency is increased and at the same time ensuring that inadvertently touching the LED light source or the corresponding components can be prevented.

The object is achieved by an arrangement for emitting light according to claim 1. Advantageous developments of the invention are the subject of the dependent claims.

According to the invention, an arrangement for emitting light is proposed which has at least one LED light source and a diffuser arranged in the light emission direction in front of the LED light source, wherein the light emission of the arrangement takes place via the diffuser. In addition, between the LED light source and the diffuser, there is provided a lens assembly formed between the LED light source and the diffuser such that all the light emitted by the LED light source is substantially completely and uniformly directed to the diffuser. In addition, reflector wings arranged laterally between the lens arrangement and the diffuser are also provided, which also possibly direct stray light to the diffuser. Here, the reflector wings are also arranged laterally next to the lens arrangement, wherein the lens arrangement is fixed by the reflector wings in the arrangement for emitting light.

The lens arrangement thus enables almost all of the light emitted by the LED light source to strike the diffuser and complete it uniformly illuminated without having to reflect a significant portion of the light emitted by the LED light source on a reflector, thereby ensuring that the light emitted from the LED light source is efficiently and with high efficiency in a nearly complete and uniform manner over the Diffuser can be dispensed.

In addition, the reflector wings may be part of a substantially U-shaped reflector, wherein the LED light source is arranged centrally within the U-shape and shows the opening of the U-shape in the direction of the diffuser.

In order to ensure that the light emitted by the LED light source is directed as completely and uniformly as possible through the lens arrangement on the diffuser, it is advantageously provided that the lens arrangement is formed in cross-section substantially frusto-conical, wherein it is the LED light source facing end portion to the top surface of the truncated cone and at the end facing the diffuser to the base of the truncated cone.

The end portion of the truncated cone facing the LED light source may in this case have a recess with a bottom surface and two side surfaces, wherein the LED light source is arranged substantially in the recess, such that the bottom surface and the side surfaces of the light entry surface of the lens assembly for that of LED light emitted, the bottom surface convex and the side surfaces may be concave. In addition, the end region of the truncated cone facing the diffuser can be substantially planar and form the light exit surface of the lens arrangement and can be configured such that the light leaving the lens arrangement is slightly widened. In addition, the two lateral lateral surfaces of the truncated cone can be curved and designed to be totally reflective.

This special lens arrangement permits efficient collection, bundling and uniform distribution of the light emitted by the LED light source to an underlying or subsequent diffuser.

Preferably, it can also be provided that the end region of the truncated cone facing the diffuser is laterally arranged, in particular multiply unwound arms for mounting the lens assembly in the light emitting device.

This then gives rise to the possibility that the lens arrangement can be fastened in the same recesses or recesses of a reflector, in which the transparent plate known from the slotlight luminaire is already held or fastened.

Advantageously, it is further provided that the arrangement for emitting light is elongated and has a plurality of longitudinally arranged LED light sources. It can then be provided that a common lens arrangement is provided for all LED light sources, which has the same cross section over the entire length. In this embodiment, the lens arrangement influences the uniform illumination of the diffuser, in particular over the width of the light exit opening, since over the entire length the lens arrangement has the same cross section. Accordingly, the light emitted by the LED light source is essentially only transversely affected and thus in one plane.

Alternatively, however, it could also be provided that a plurality of lens arrangements are present, wherein each lens arrangement is associated with at least one LED light source. In this way, for example, there is the possibility that each LED light source is assigned a single lens arrangement, which in addition to the transverse direction also an influence in the longitudinal direction and thus in two planes is possible. The light may then be influenced such that it is directed substantially completely towards the diffuser in the transverse direction and, on the contrary, tends to be distributed widely in the longitudinal direction. Due to this rather broad distribution, a better mixing of the light in the longitudinal direction is achieved, whereby the influence of individual LED failures or different color or luminous flux densities (deviations and consequent irregularities) can be minimized.

Preferably, furthermore, it can also be provided that the arrangement for emitting light has a housing with a light exit opening, wherein in the Housing the at least one LED light source and the lens assembly are arranged and the diffuser closes the light exit opening.

Figur 1

aus dem Stand der Technik bekannte Anordnung zur Lichtabgabe im Querschnitt;

Figur 2

erfindungsgemäße Anordnung zur Lichtabgabe im Querschnitt;

Figur 3

erfindungsgemäße Anordnung zur Lichtabgabe im Querschnitt mit Strahlengängen des Lichts;

Figur 4

erfindungsgemäße Anordnung zur Lichtabgabe im Querschnitt mit Strahlengängen des Lichts;

The invention will be explained in more detail with reference to embodiments and the accompanying drawings. Show it:

FIG. 1

known arrangement for emitting light in cross-section from the prior art;

FIG. 2

inventive arrangement for light emission in cross section;

FIG. 3

arrangement according to the invention for emitting light in cross section with beam paths of the light;

FIG. 4

arrangement according to the invention for emitting light in cross section with beam paths of the light;

FIG. 1 shows, as already explained above, by way of example, an already known from the prior art Slotlight lamp 1 of the applicant. In this arrangement for light emission or light 1, a transparent plate 4 is provided between the LED light source 2 and the diffuser 3, which serves in particular as protection against contact. By contrast, the light guide of the light emitted by the LED light source 2 essentially takes place through the reflector vanes 7 of the reflector 5. The reflector vanes 7 have corresponding recesses or recesses in which the ends of the transparent plate 4 are arranged and, accordingly, by the reflector 5 are kept. In this known from the prior art lamp 1, a significant portion of the light emitted from the LED light source 2 is directed by multiple reflections on the reflector wings 7 on the diffuser 3, whereby the reflector wings 7 must have a correspondingly high-quality reflector material.

In the present invention, on the other hand, it is provided that instead of the transparent plate 4, a lens assembly 14 is used. FIG. 2 shows a corresponding light fixture 11 according to the invention or arrangement for emitting light, which in turn has a diffuser 3 and an LED light source 2. As already at the in FIG. 1 shown lamp 1 is also in the in FIG. 2 shown light source 2, the LED light source 2 disposed within a housing 6, wherein the diffuser 3, the light exit opening of the housing 6 closes. Likewise, the lamp 11 has a reflector 5 with two arranged laterally within the housing 6 reflector wings 7, wherein the lens assembly 14 is secured or held in the same recesses or recesses in which the ends of the transparent plate 4 in FIG. 1 be held or attached. For this purpose, the lens arrangement 14 has two multiply angled arms which are each arranged laterally on the main body of the lens arrangement 14.

The main body of the lens assembly 14 is in this case frusto-conical, wherein it is the LED light source 2 end portion facing the top surface of the truncated cone and at the end facing the diffuser 3 to the base of the truncated cone and the multi-angled arms at the diffuser 3 facing end portion of the truncated cone are arranged laterally.

The end region of the truncated cone facing the LED light source 2 additionally has a depression, wherein the LED light source 2 is arranged substantially in the depression. In this case, the depression consists essentially of a bottom surface and two side surfaces which correspondingly form the light entry surface of the lens arrangement 14 for the light emitted by the LED light source 2.

The bottom surface is in this case formed as a convex, spherical lens having a radius of, for example, 13 mm, wherein the geometry is selected such that the light emitted by the LED light source 2 strikes the bottom surface, for example in an angle range of -50 ° to + 50 ° and is bundled by the convex shape. This light then leaves the lens arrangement 14 via the end region of the truncated cone facing the diffuser 3, this end region being substantially planar and forming the light exit surface of the lens arrangement 14. In addition, this end region is also designed such that the light leaving the lens arrangement 14 is slightly widened or broken, for example in one Angle range of -35 ° to 35 °, such that this proportion of light is distributed uniformly over the entire width of the diffuser 3.

In FIG. 3 is the in FIG. 2 illustrated lamp 11 according to the invention shown with corresponding light rays, where in particular the light emitted from the LED light source 2 is shown, which strikes the bottom surface of the recess. Due to the convex shape of the bottom surface, the light is first bundled, and then slightly expanded again on leaving the lens arrangement 14 via the end region facing the diffuser 3, so that the light leaving the lens arrangement 14 leaves the diffuser 3 illuminated as completely and evenly as possible.

The side surfaces of the recess are in contrast formed as a concave, spherical lens having a radius of for example about 4.5 mm, wherein it is provided that these side surfaces emitted by the LED light source 2 light in an angular range, for example, from -90 ° to -50 and from + 50 ° to + 90 °. The LED light source 2 can in this case be arranged in the recess such that it is located in the center of the circle of the two side surfaces, so that no change in direction of the light is produced. The side surfaces then transmit the light radially (i.e., without diffraction) to the lateral lateral surfaces of the truncated cone. These lateral lateral surfaces are in this case curved and formed totally reflecting, so that the directed from the side surfaces to the lateral surfaces of light is deflected by total reflection, such that after leaving the lens assembly 14 via the diffuser 3 end facing the light also illuminates the diffuser completely and evenly , It should be noted that this light is again slightly widened by refraction through the end region facing the diffuser.

In FIG. 4 Now corresponding light beams are shown, which pass from the LED light source 2 in the lens assembly 14 via the side surfaces of the recess. FIG. 4 again shows the in FIG. 2 shown lamp 11.

Both the light entering the lens assembly 14 via the bottom surface of the recess and the light entering the lens assembly 14 via the side surfaces of the recess Lens assembly 14 entering light is influenced by the lens assembly 14 such that it after leaving the lens assembly 14, the diffuser 3 evenly and completely illuminated, resulting in a higher efficiency and a better efficiency.

In addition, it should also be noted that the design of the lens assembly 14 and in particular also by the attachment in the same recesses or recesses, the lens assembly 14, as well as the transparent plate 4, serves as protection against contact for the LED light source 2 and the corresponding components and accordingly accidental contact with these parts when opening the diffuser 3 can be largely prevented.

Accordingly, it would also be conceivable that in existing slotlight lights 1, the transparent plates 4 are replaced by corresponding lens assemblies 14 and thus a new light 11 is created according to the inventive arrangement for light output.

Furthermore, it should be noted that the known slotlight luminaires are elongate luminaires which have a plurality of LED light sources distributed over the length. In this case, it can then be provided that a common lens arrangement is provided for all LED light sources, which has an unchanged cross-section in the longitudinal direction. In this case, the light is then essentially influenced only in the transverse direction and thus only in one plane. Alternatively, however, a plurality of lens arrangements could also be provided, for example a lens arrangement for each LED light source. As a result, there is the possibility that the light can be influenced both in the transverse direction and in the longitudinal direction and thus in several planes. In the longitudinal direction, for example, a very wide distribution or generation of very flat light may be desired in order to achieve even better light mixing.

To the reflector or the reflector wings is still to be noted that they can still be present in order to direct any existing stray light on the diffuser. However, it is then no longer necessary to use a particularly high-quality and therefore expensive reflector material, since the Proportion of the light which is directed by the reflector wings on the diffuser, is considerably less than in the FIG. 1 shown light.

Claims (12)

1. Light emitting assembly (11) with at least one LED light source (2) and a diffuser (3) arranged in the light emitting direction in front of the LED light source (2), wherein the light emission of the assembly (11) takes place via the diffuser (3), and between the LED light source (2) and the diffuser (3) a lens assembly (14) is provided that is configured and arranged between the LED light source (2) and the diffuser (3) in such a way that all the light emitted from the LED light source (2) is essentially completely and evenly directed at the diffuser (3), and wherein reflector wings (7) are provided laterally between the lens assembly (14) and the diffuser (3), characterized in that the reflector wings (7) are also arranged laterally next to the lens assembly (14) and the lens assembly (14) is attached by the reflector wings (7) in the light emitting assembly (11).
2. Light emitting assembly according to claim 1, characterized in that the reflector wings (7) are part of an essentially U-shaped reflector (5), wherein the LED light source (2) is arranged centrally within the U-shape and the opening of the U-shape points towards the diffuser (3).
3. Light emitting assembly according to one of the preceding claims, characterized in that the lens assembly (14) is configured in cross section essentially in the shape of a truncated cone, wherein the end section facing the LED light source (2) is the top surface of the truncated cone and the end section facing the diffuser (3) is the base surface of the truncated cone.
4. Light emitting assembly according to claim 3, characterized in that the end section of the truncated cone facing the LED light source (2) has an indentation with a bottom surface and two lateral surfaces, wherein the LED light source (2) is essentially arranged in the indentation in such a way that the bottom surface and the lateral surfaces form the light entry surface of the lens assembly (14) for the light emitted by the LED light source (2).
5. Light emitting assembly according to claim 4, characterized in that the bottom surface is convex and the lateral surfaces are concave.
6. Light emitting assembly according to one of claims 3 to 5, characterized in that the end section of the truncated cone facing the diffuser (3) is essentially plane and forms the light exit surface of the lens assembly (14) and thereby is configured in such a way that the light leaving the lens assembly (14) gets slightly expanded.
7. Light emitting assembly according to one of claims 3 to 6, characterized in that the two lateral shell surfaces of the truncated cone are configured curved and totally reflective.
8. Light emitting assembly according to one of claims 3 to 7, characterized in that the end section of the truncated cone facing the diffuser (3) has laterally arranged, in particular multiply angled, arms for attaching the lens assembly (14) in the light emitting assembly (11).
9. Light emitting assembly according to one of the preceding claims, characterized in that the light emitting assembly (11) is configured oblong and has several LED light sources (2) arranged in longitudinal direction.
10. Light emitting assembly according to claim 9, characterized in that a mutual lens assembly (14) is provided for all LED light sources (2) that has the same cross section over the entire length.
11. Light emitting assembly according to claim 9, characterized in that several lens assemblies (14) are provided, wherein a LED light source (2) is assigned to each lens assembly (14).
12. Light emitting assembly according to one of the preceding claims, characterized in that the light emitting assembly (11) has a housing (6) with a light exit opening, wherein in the housing (6) the at least one LED light source (2) and the lens assembly (14) are arranged and the diffuser (3) closes the light exit opening.

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