AT18042U1 - Arrangement for light emission with variable light emission characteristics - Google Patents

Abstract

The present invention relates to an arrangement for emitting light, comprising a plurality of LEDs (16), which are arranged distributed on a support in a common plane, and a cover (20) covering the LEDs, which consists at least partially of a translucent material and which integrates several has optical elements (22) assigned to the LEDs (16), the cover (20) influencing the light emitted by the LEDs (16) in such a way that an axis (I) perpendicular to the plane of the LEDs (16) is asymmetrical Light emission is effected, and wherein the cover (20) can be attached to the carrier for the LEDs (16) in at least two positions and covers the LEDs (16) in each position.

Description

Description

ARRANGEMENT FOR LIGHT Emission WITH MODIFIABLE LIGHT Emission CHARACTERISTICS

The present invention relates to an arrangement for light emission, which has a plurality of LEDs and a cover with optical elements assigned to the LEDs. It should be possible to adapt the light emission properties of the arrangement.

Luminaires are known in different embodiments and, depending on their design, offer various options for influencing the light output.

Changing the brightness and/or the color or color temperature of the emitted light is often done, for example, in electronic form. This means that the lamps, which are generally designed as LEDs, are controlled in a suitable manner with the aid of a corresponding control device in order to emit a mixed light overall with the desired intensity and/or a desired color location.

If, on the other hand, it is desired to spatially influence the light output, for example to direct the light of a lamp in a certain direction, adjustable lamps are often used. In particular, adjustable or pivotable spots should be considered, with which the light can be directed in a specific direction.

Furthermore, solutions are known from the prior art in which the light output of a lamp is limited to a certain angular range with the help of suitable reflectors. In this case, the corresponding reflectors or other attachments must be attached to the lamp in a suitable manner when installing it.

If light output with high intensity is to be achieved, LED arrangements which have a large number of LEDs are now usually used as lighting means. These LEDs, which are often arranged in matrix form, produce a very high amount of light and are therefore usually coupled to a heat sink in order to be able to efficiently dissipate the heat that occurs during operation of the lamps. The LEDs are then assigned corresponding optics through which the light is influenced in a specific way. If light is to be emitted in a specific direction or in a specific angular range, appropriate optics must be used. It would be conceivable to influence the light output in the desired way using additional add-on parts. As a rule, however, such reflective attachments affect the appearance of the lamp, so ideally they should be avoided.

The present invention is based on the task of offering a possibility of being able to influence the light output in a simple manner with lamps of the type described above.

The object is achieved by an arrangement for light emission which has the features of claim 1. Advantageous developments of the invention are the subject of the dependent claims.

The solution according to the invention is to design a cover assigned to the LEDs, which has integrated optical elements, in such a way that an asymmetrical light emission is caused, with the possibility of having the cover in at least two different positions on a support for the LEDs to fix. Depending on the orientation or position of the cover, the light emitted by the LEDs can then be directed in a desired direction, opening up the possibility of easily influencing the direction of the light output of a lamp without affecting its appearance.

According to the invention, an arrangement for emitting light is thus proposed, which

has several LEDs which are arranged distributed on a carrier in a common plane. Furthermore, a cover covering the LEDs is provided, which consists at least partially of a translucent material and which has a plurality of optical elements assigned to the LEDs in an integrated manner, the cover influencing the light emitted by the LEDs in such a way that with respect to a perpendicular to the plane of the LED standing axis an asymmetrical light emission is caused, and wherein the cover can be attached to the carrier for the LEDs in at least two positions and completely covers the LEDs in each position.

[0011] The prerequisite for the present invention is therefore first of all that the cover as a whole causes an asymmetrical light emission. By choosing a suitable position on the carrier for the LEDs, the direction of light emission can then be adjusted as desired. If a lamp has several corresponding arrangements for emitting light, there is also the possibility of achieving symmetrical light emission, but in this case, for example, adjusting the opening angle for the light emitted by the lamp as a whole. This means that the light output can be influenced in different ways.

The optical elements of the cover according to the invention are preferably formed by lenses, although these optical elements can all be designed identically according to a first exemplary embodiment. Of course, as an alternative to this, there is also the possibility of designing the optical elements of the cover differently, although ultimately there is an asymmetrical light output overall.

The cover itself can consist entirely of a single translucent material. However, an embodiment would also be conceivable in which only the optical elements or the lenses consist of the translucent material and other areas of the cover consist of an opaque or, for example, a translucent but light-scattering material.

It is preferably provided that in each position of the cover one LED is assigned exactly to the optical element. What is important here is that the light from all LEDs can actually be used in a meaningful way to emit light in every position of the cover. However, it can also happen that a large number of optical elements are present and only some of the optical elements are actually used, depending on the respective position of the cover.

The LEDs are preferably arranged evenly distributed on the carrier. You can form a rectangular or square arrangement. A uniform polygonal arrangement would also be conceivable, which would then allow more than two different positions for arranging the cover on the carrier. The cover itself can preferably be attached to the carrier without tools, in particular latched to it.

According to the invention, a lamp is further proposed which has an arrangement for emitting light as described above. The lamp can also have a heat sink, which forms the carrier for the LEDs, in which case the cover can be attached to the heat sink or to a housing of the lamp. It can also be provided that the lamp according to the invention has several of the arrangements according to the invention described above for emitting light. In particular, in the event that two arrangements are provided, it is preferably provided that they are arranged symmetrically to one another with respect to a longitudinal axis of the lamp.

The invention will be explained in more detail below with reference to the accompanying drawing. Show it:

Figure 1 is a perspective view of a lamp which has two arrangements according to the invention for emitting light;

Figure 2 is an enlarged view of a portion of the lamp from Figure 1;

Figures 3-5 various options for aligning the covers of the arrangement for light emission in the lamp according to Figure 1 and schematically the resulting light emission.

1 shows, as an application example for the concept according to the invention, a lamp generally provided with the reference number 100, which is designed as a so-called high bay lamp. Such lights are mainly used in industrial and/or hall lighting and are therefore designed to emit a very high amount of light. They are usually installed in relatively high rooms and are intended to illuminate a larger area of the room below with high intensity. However, the concept according to the invention is not limited to corresponding high bay lights and does not necessarily have to be used in lights that have two or more arrangements according to the invention for emitting light. Of course, lights according to the invention would also be conceivable in which only a single arrangement for emitting light, which is designed as described in more detail below, is used.

The lamp 100 shown in Figure 1 therefore has two arrangements according to the invention for light emission 10 arranged in a trapezoidal lamp housing, which are arranged symmetrically on both sides with respect to a longitudinal axis L of the lamp 100. These initially consist of lamps in the form of an LED arrangement 15 and a cover 20 assigned to the LED arrangement 15. In the exemplary embodiment shown, the LED arrangement 15 consists of a large number of individual LEDs 16, which are arranged on a rectangular circuit board 17 and thus in a common plane are. The circuit board 17 rests on a housing part designed as a heat sink, which serves as a support for the lamps 15 and is designed in such a way that the heat that occurs during operation of the lamps 15 can be efficiently dissipated. The representations of the lamp 100 show that corresponding cooling fins are formed on the outer circumference of the lamp housing, with the help of which a corresponding heat exchange is carried out. However, further measures through which optimized heat dissipation is achieved will not be explained in more detail below since they are not a direct part of the invention.

The light emitted by the LEDs 16 is influenced with the help of the cover 20 already mentioned. As shown in particular in Figures 1 and 2, the cover 20 is formed by a rectangular element, the dimensions of which essentially correspond to the dimensions of the LED board 17. A central area 21 of the cover 20 is formed with an arrangement of optical elements, which are designed as lenses 22 in the exemplary embodiment shown. A frame-like area 24 of the cover 20 surrounding the central area 21 can, like the central area 21 with the lenses 22, consist of a translucent material. However, it would also be conceivable to design this frame-like peripheral area 24 from a different material, for example from an opaque material. A light-scattering design of this frame-like area 24 would also be conceivable, so that the frame appears diffusely brightened, if this is desired.

The cover 20 is preferably designed as a one-piece element and can be produced, for example, as part of a two-component injection molding process. It would also be conceivable to first create the central area 21 in a first step and then to encapsulate this area 21 with a second material in order to form the frame-like area 24.

The cover 20 itself should be detachably mountable on the lamp 100. Can be seen in Figure 1 are several locking arms 26 formed laterally on the outer circumference of the cover 20, which lock into corresponding recesses in the heat sink of the lamp 100. The design is preferably such that the cover 20 can be locked to the lamp 100 without tools, but an aid, for example in the form of a screwdriver, is required to release the lock. A suitable sealing ring 18 can also be provided on the cover 20 or the heat sink, so that in the locked state of the cover 20

This completely covers the LEDs 16 in a sealing manner and accordingly protects them from external influences, in particular from dust and / or moisture.

A special feature of the cover 20 is that the optical elements 22 are designed in such a way that an asymmetrical light emission is achieved through the cover 20. This can be seen in the enlarged view according to FIG. 2, which shows that the lenses 22 of the cover 20 are not designed to be rotationally symmetrical. Instead, in the exemplary embodiment shown, the left side of the lenses 22 is designed to be rounded, while the opposite right side of the lenses 22 is designed to be more flattened. This special design of the dome-like lenses 22 means that they emit the light from the associated LED 16 preferably to the left.

In the exemplary embodiment shown, all lenses 22 of the cover 20 are designed identically and thus each produce an asymmetrical light emission towards the left side. However, this is not absolutely necessary. It would also be conceivable that the lenses of the cover 20 are not all designed identically and each influence light in different ways. Overall, however, the cover 20 should emit light asymmetrically in a preferred direction, this preferred direction of light emission being marked by a corresponding marking 28 on the frame-like peripheral region 24. Based on the marking 28, it can be immediately seen in which direction light will be emitted through the cover 20.

The fact that it is possible to arrange the cover 20 oriented in different ways on the lamp 100 now opens up the possibility of influencing the light output of the lamp 100 as a whole in a simple manner. This will be explained in more detail below using Figures 3-5.

3a first shows the lamp according to FIG is delivered. This achieves a light emission as shown schematically in Figure 3b. Both covers 20 therefore have an effect with respect to a vertical | at the level of the LEDs an asymmetrical light emission towards the left side. Such a configuration can be used, for example, if the lamp 100 is arranged in the edge area of a room or hall to be illuminated and is in particular also to be used to illuminate a wall area lying to the left below the lamp 100.

If, on the other hand, symmetrical light emission is desired, the orientation of the covers 20 can be selected, as shown in FIG. 4a. Both covers 20 are now arranged in opposite directions on the lamp 100, each in such a way that they emit light further laterally downwards from their side. The light emission corresponds to the diagram in FIG. 4b, whereby it can be seen that overall a symmetrical light emission - with respect to a central plane of the lamp 100 - is achieved with a wide opening angle. If, on the other hand, the orientation of both covers 20 is swapped, a light emission is achieved as shown in FIG. 4c. Once again, this results in a symmetrical light emission, which now, however, includes a somewhat smaller area, since the light bundles initially cross each other at a certain distance below the lamp 100 or - depending on the distance of the lamp from the ground - are directed at a common area to be illuminated . Such an alignment of the covers can be useful, for example, if a narrower area below the lamp 100 is to be illuminated in a concentrated manner.

If, on the other hand, the covers 20 are arranged on the lamp 100 in the same direction, as shown in FIG. 5a, then a light output is achieved in accordance with the illustration in FIG.

The above examples make it clear that due to the possibility of having covers in different orientations on the lamp 100, which cause asymmetrical light emission

to attach, the light emission properties of the lamp 100 can be influenced in a simple manner. In particular, this can only be done as part of the installation of the lamp 100 in a room to be illuminated, so that the light output can be specifically adapted to the operational situation.

The invention is also not limited to the illustrated embodiment, in which the cover is rectangular and can therefore be attached to the carrier for the LEDs in two different orientations. For example, a square arrangement of the LEDs and thus a square design of the cover would also be conceivable. In this case, the cover could then be attached in four different orientations relative to the LEDs. Continuing this idea, polygonal designs with regard to the LED arrangement or the cover would also be conceivable, with the number of possible arrangements for the cover then increasing accordingly. It is important that the light of all LEDs is used accordingly in every possible position of the cover and that each LED is assigned an optical element of the cover. However, it would be conceivable that the number of optical elements of the cover is greater than the number of LEDs and therefore individual optical elements are not used in certain rotational positions.

It should also be noted that the optical elements do not necessarily have to be lenses. Other structures, for example corresponding to prisms or the like, which overall lead to an asymmetrical light emission from the corresponding cover, would also be conceivable.

With the help of the solution according to the invention, the light emission properties of a lamp can be easily influenced. In contrast to previously known solutions, it is not necessary for the appearance of the luminaire to be influenced by the use of additional attachments. It is also not necessary to use differently designed optics, which would lead to significantly higher manufacturing costs.

Claims (8)

Expectations 1. Arrangement for light emission, comprising * several LEDs (16), which are arranged distributed on a carrier in a common plane, * a cover (20) covering the LEDs, which consists at least partially of a translucent material and which has a plurality of optical elements (22) assigned to the LEDs (16), wherein the cover (20) influences the light emitted by the LEDs (16) in such a way that an asymmetrical axis (I) that is perpendicular to the plane of the LEDs (16). ric light emission is effected, and wherein the cover (20) is in at least two positions on the carrier for the LEDs (16) can be attached and covers the LEDs (16) in any position, characterized, that the optical elements (22) are formed by lenses; and or that all optical elements (22) are identical. 2. Arrangement according to claim 1, characterized in that the cover (20) consists entirely of a single material. 3. Arrangement according to one of the preceding claims, characterized in that an optical element (22) is assigned to an LED (16) in each position of the cover (20). 4. Arrangement according to one of the preceding claims, characterized in that the LEDs (16) are arranged evenly distributed. 5. Arrangement according to one of the preceding claims, characterized in that the LEDs (16) form a rectangular arrangement, or that the LEDs (16) form a uniformly polygonal arrangement. 6. Arrangement according to one of the preceding claims, characterized in that the cover (20) can be attached to the carrier without tools, in particular can be locked with it. 7. Luminaire (100), having an arrangement for light emission according to one of the preceding claims, characterized in that it has a heat sink which forms the carrier for the LEDs (16), the cover (20) being attachable to the heat sink. 8. Lamp according to claim 7, characterized in that it has two arrangements for emitting light, which are arranged symmetrically to one another with respect to a longitudinal axis of the lamp (100). This includes 2 sheets of drawings