EP3408587A1

EP3408587A1 - Optical system for influencing the light output of a light source

Info

Publication number: EP3408587A1
Application number: EP17701834.8A
Authority: EP
Inventors: Stephan Pieper; Sebastian Schade; Christian Kohler; Andreas NIEDERSTÄTTER
Original assignee: Zumtobel Lighting GmbH Austria
Current assignee: Zumtobel Lighting GmbH Austria
Priority date: 2016-01-29
Filing date: 2017-01-23
Publication date: 2018-12-05
Anticipated expiration: 2037-01-23
Also published as: DE102016201347B4; EP3408587B1; AT16514U1; DE102016201347A1; WO2017129503A1

Abstract

The invention relates to an optical system for influencing the light output of a light source comprising a cup-like reflector (20), which has a light outlet opening (21), and comprising a lens (10), which is designed to radiate a first proportion of the light via the light outlet opening (21) of the reflector (20) in a preferred direction defined by the lens (10), wherein the lens (10, 60) is also configured to emit a second proportion of the light laterally in such a way that said proportion falls onto the reflector inner wall.

Description

Optical system for influencing the light output of a light source

The present invention relates to an optical system which is provided for influencing the light output of a light source and has at least one pot-like reflector which forms a light exit opening, is emitted via the light. Furthermore, the present invention relates to a lamp in which a

corresponding optical system is used, wherein it may be in the lamp in particular a lamp, which is used outdoors.

Lights, with the help of certain areas or objects to be illuminated, must necessarily have means by which the light generated by the bulbs is selectively emitted into the area to be illuminated. As a rule, these are additional optical elements to the light sources which, by reflection and / or refraction of the light, influence this in such a way that it is aligned in the desired manner in accordance with the lighting situation.

One way to influence the light output in the desired manner, are the already mentioned reflectors. In this case, it is often provided that not a single large reflector is used, but instead several pot-like reflectors are joined together like a matrix to form a so-called grid, via which the light of the lighting means is then emitted. While earlier bigger

Lamps were used in the form of elongated fluorescent lamps or the like, LEDs are now used as a rule, in which case usually each LED reflector bulb is associated with an LED bulb. The light sources may each be individual LEDs or clusters, for example a plurality of differently colored LEDs, which then ultimately emit a mixed light in the desired color or color temperature.

The design of the reflector is then such that due to the shape of the

Reflector wall and the corresponding positioning of the light source relative to the reflector all light beams are influenced so that they can leave the reflector only within a certain angular range, wherein the

Angle range is selected such that the light output takes place in the desired direction. Outside of this defined primarily by the design of the reflector area, however, then takes place almost no light output, so that on this Way the light can be influenced very simply and effectively. Reflectorrasters of this type are therefore used very frequently and in different fields of application, for example to realize a so-called glare-free illumination or to avoid disturbing reflections on screen surfaces or the like.

However, the complete restriction of the light output to the angle range predetermined by the reflector has the consequence on the other hand that the luminaire or the switched-on state of the luminaire is only recognizable by an observer when it is in the solid angle range in which the by the reflector predetermined light emission takes place. On the other hand, if the observer is outside this angular range, the light initially appears dark from his point of view.

This, in turn, means that the observer's eye has a strong transition from the non-illuminated area to the illuminated area

Increase in brightness takes place, to which the eye has to get used within a very short time. This is often perceived as unpleasant, which is why it is often attempted with the help of additional lighting effects on the one hand to the observer

signaling the on-state of the luminaire and, on the other hand, allowing the observer's eye to adapt in advance, at least to some degree, to the increased brightness present in the illuminated area. These measures are often indirect or secondary

Light output, which is achieved with the help of additional light sources, for example, direct light on the ceiling of a room in which the light is located, or laterally diffuse light.

However, such measures for the secondary light output are associated with additional effort and in lights in the outdoor area rather unusual or not feasible. Again, the problem often arises that abrupt

Brightness increases in the transition from a non-illuminated area to a lighted area should be avoided.

Incidentally, the above-described problem is not only in the use of

Reflektorrastern or pot-like individual reflectors, but can also result in other types of optics. For example, very often so-called TIR lenses are used to influence the light of LEDs, which very efficiently bundle the light originally emitted by the LED in a very wide angular range, ie restricting it to a specific angular range. Also in this case occur at the transition between the non-illuminated area and the illuminated area strong differences in brightness, which are perceived as unpleasant.

It is therefore an object of the present invention to provide novel possibilities for influencing the light output of a light source, which on the one hand make it possible to emit the light in a desired range very efficiently, but on the other hand avoid the problems described above.

The object is achieved by an optical system, which has the characteristics of

independent claims, solved. Advantageous developments are

Subject of the dependent claims.

The solution according to the invention is based on the idea of influencing the light output of a light source, for example an LED, on the one hand with the aid of a pot-type reflector and on the other hand with the aid of a lens. It is provided in particular that the lens is designed such that a first portion of the light is radiated substantially independently of the reflector in a preferred direction defined by the lens. Furthermore, however, the lens is additionally designed to deliver a second portion of the light laterally such that this portion falls onto the inner wall of the reflector. This reflector wall is designed in particular diffusely reflecting, so that it appears slightly lightened by the second portion of the light from different angles.

Even under shallow viewing angles, under which a dazzle for one

Observers should be excluded and in which, accordingly, the primary portion of the light with the help of the lens is not delivered, so the inner wall of the reflector appears slightly brighter and can be detected by an observer. This is for the observer even before reaching the directly illuminated by the lens

Area readily recognizable that the light is on, and

Brightness differences in the transition to the area directly illuminated by the first portion are accordingly no longer perceived as disturbing.

According to the present invention, therefore, an optical system for influencing the light output of a light source is proposed, which has a pot-like reflector having a light exit opening, and a lens which is adapted to a first portion of the light through the light exit opening of the reflector in a through Furthermore, the lens is adapted to deliver a second portion of the light laterally such that this portion falls on the reflector inner wall. In the solution according to the invention, the pot-shaped reflector thus fulfills less the task of restricting the light output to a certain angular range compared to previous light grids, but rather serves to diffuse a small proportion of light diffusely in different directions in order to make the on state of the luminaire recognizable , The actual light control, however, is made by the lens, so here is a completely new interaction of the two optical elements reflector and lens is present.

The lens may be a so-called TIR lens in a classical manner. It then points in this case, first, one of the light source facing, for example

frustoconical so-called collimator on. This may have a light source facing the recess whose mantle and bottom surface a

Light entry surface of the lens forms, wherein in a known manner, the LED is then positioned in the region of this recess.

The lens may then have a substantially planar light exit surface according to a first embodiment. In this case, the light is then preferably emitted in a direction that is substantially parallel to the vertical with respect to the plane of the light exit opening of the reflector. A whitening of the reflector inner wall by the second portion of the light can then be achieved, for example, by using stray light which is emitted by the lens. In addition, this effect can also be specifically enhanced by, for example, selectively providing edge regions of the light exit surface of the lens with a corresponding scattering structure.

As an alternative to this embodiment of a lens, however, it can also be provided that the emission of the first light component takes place in a direction which is inclined with respect to an axis perpendicular to the plane of the light exit opening of the reflector. This may be desirable in particular when e.g. the reflector is oriented vertically downwards, with the help of the lamp, however, for example, an asymmetrical light output is to be achieved, as is desired in lights for street lighting or the like. In this case, lenses must then be used which cause an asymmetrical light output, which can be done, for example, by virtue of the fact that the light exit region of the lens has a so-called Fresnel structure. In this case, too, the lightening of the reflector inner wall according to the invention by means of the second

To be able to achieve the light component, it can now be provided that a scattering or decoupling structure is formed on the circumference of the Fresnel structure, via which the second light component is emitted. In this case, the lens is preferably arranged at least with its light exit region or the Fresnel structure within the reflector. The lighting effect according to the invention, namely, that with the help of the illuminated reflector inner wall from different viewing directions of the on state of the lamp can be detected, comes particularly well into play, if the reflector is formed diffusely scattering. However, it has been shown that a particularly attractive lighting effect can be achieved if, in addition, a usable in the reflector, also pot-like use is used, which consists of a transparent, but also slightly diffuse scattering material. This insert, which corresponds with its outer contour of the inner contour of the reflector, so on the inner walls of the reflector, but already diffuses in different ways, the second portion of the light that falls on him, the scattering particles on the one hand and the transparent material of the insert on the other produce an optical depth effect that makes the insert appear slightly glowing overall. This gives the lamp according to the invention in the on state a special

attractive appearance. The use of this additional use is not necessarily required in combination with the lens described above. Rather, such an application could also be used in other optical systems, which is why this idea is also the subject of a separate independent

Claim is.

The so-called glow reflector insert according to the invention, which preferably has a constant wall thickness, can in this case be formed, for example, from PMMA or PC.

According to a preferred embodiment, in this case the optical system is designed such that it has a plurality of reflectors, which are arranged in the manner of a matrix and jointly form a corresponding grid. The reflectors may in this case be at least partially connected to one another in one piece. Then come the above-mentioned additional inserts of the transparent and diffusely scattering material used, so these are preferably made in one piece, so that they can be recognized in a corresponding manner from the light exit side to the grid and locked for example with this.

As already mentioned, a preferred application example of the invention is a luminaire in the outer area. This may be both a luminaire, bundling the targeted light emits in a desired area to illuminate, for example, an object located in this area or the like. In the same way, however, it is also possible to realize a luminaire which is used, for example, to illuminate a street or a sidewalk and accordingly effects an asymmetrical light output overall, which enables illumination of a longer road section.

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

Figures 1 and 2 are views of a first embodiment of a lamp in which the optical system according to the invention is used;

Figures 3 to 5 are views of a single, for the production of light

responsible lamp assembly of the lamp;

Figures 6 and 7 are views of a reflector grid, which is part of the in the

Figures 3-5 is a lighting assembly; Figure is a side view of a glow insert according to the invention for the reflector grid;

Figure 9 shows the process of assembling the lamp assembly;

Figures 10 to 12 are views of a lens according to the invention, with the aid thereof

on the one hand, light is emitted in a preferred direction and on the other hand, the reflector walls are illuminated;

Figure 13 is an enlarged view of the lens of Figures 10 to 12; 14 shows a second embodiment of a luminaire, in which the optical system according to the invention consists of a

Reflector and a glow insert can be used and

Figures 15 and 16 views of a used in this second lamp

coming alternative lens. Figures 1 and 2 show first two perspective views of a first, provided for outdoor use light, in the figures generally with the

Reference numeral 100 is provided. It is a lamp whose optical system - as explained in more detail below - is designed so that an asymmetric light output is achieved, such that seen in the longitudinal direction L of the lamp 100 takes place a very strong expansion of the emitted light. If such a light fixture is, for example, attached to a columnar support or to a house wall, then, for example, the underlying road area can be illuminated on both sides over a greater distance. Accordingly, the illustrated luminaire 100 is particularly suitable for illuminating roads, carriageways and / or sidewalks.

Basically, the luminaire 100 is constructed in two parts with an approximately parallelepiped-shaped first module 110 and a second module 120, the so-called light-emitting module, which is likewise of cuboid design and fastened to the first module 110. The first module 110 hereby includes a majority of the electronic

Components of the lamp 100, in particular the necessary means for converting the general supply voltage in a suitable operation of the lamp operating voltage. This may in particular be a correspondingly designed LED converter.

The attachment of the luminaire 100 to a suitable carrier takes place via a connection region 115, which is formed on a rear wall 111 of the first module 110. This connection area 115 is also the connection to external

Power supply lines, and according to a preferred variant also

It can be provided that the connection region 115 defines an axis of rotation R, around which the first module 110 and thus the luminaire 100 can be rotated or pivoted in total, at least in a certain angular range.

The light-emitting module 120 is also cuboid-shaped according to the illustration and, seen in the longitudinal direction, has comparable dimensions to the first module 110, but is arranged slightly offset from this for aesthetic reasons. The attachment of the lamp module 120 to the first module 110 may be rigid in this case. Alternatively, it would also be conceivable, the

To make connection so that according to the indicated arrow the

Bulb module 120 can be pivoted about an axis which is parallel to the longitudinal direction L. Again, the connection may be made such that the pivoting of the lamp module 120 is limited to a certain angle range. In case of use as a lamp for street lighting can then, for example, by the swiveling the light output to the distance between the lane to be illuminated and the support to which the lamp 100 is attached, be adjusted. In the following, the design of the illuminant module 120 will be explained in the first place, since this includes the optical components according to the invention.

As can be seen in FIG. 1, the illuminant module 120 within the cuboid housing has a matrix-like arrangement of luminous means and associated optical elements. These optical elements form i.a. a grid-like reflector arrangement, wherein the light exit opening of the

Illuminant module 120 is covered by a transparent plate 125. This transparent pane 125 serves primarily to protect the components responsible for light generation from external influences, but preferably does not influence the light output of the luminaire 100.

The recognizable in Figure 1 grid-like configuration of the optical means is achieved by the planar joining of individual so-called. Lamp assemblies, as shown in Figures 3-5. Each designated by the reference numeral 50

Assembly here has four individual lamps in the form of LEDs and associated optical elements for influencing the light output. This means that in the case of the luminaire 100 shown in FIGS. 1 and 2, a total of eight

corresponding lamp assemblies 50 are used, which are arranged in two adjacent rows of four modules 50. However, of course, depending on the size of the lamp and the number and arrangement of the lamp assemblies 50 are selected accordingly. As will be explained in more detail below, in this case the illuminant assemblies 50 are identical except for the orientation of the lenses used.

Each module has, as shown in Figures 3-5 recognizable initially

Carrier element in the form of an approximately square circuit board 55, on the first time responsible for the light generation, not visible in the figures LEDs are arranged. These can be single LEDs and, if necessary, also LED clusters, which ultimately emit a mixed light in the desired color.

The circuit board 55 also serves to hold the other optical components that are responsible for influencing the light output. It This is first about lenses 10, as well as pot-trained

Reflectors 20. Both the lenses 10 and the reflectors 20 are preferably each connected together to form an assembly in order to keep the number of individual parts during assembly of the lamp 100 as low as possible. In particular, however, the lenses 10 could possibly also be present as individual components. However, the four pot-like reflectors 20 are preferably combined to form the 2x2 grid 30 shown in isolation in FIGS. 6 and 7, since otherwise a correspondingly coordinated positioning of the individual reflectors 20 would be very complicated and cumbersome.

The individual reflectors 20 of the grid 30 are each made approximately truncated pyramidal and each have a square light exit opening 21 and this opposite a circular bottom opening 22. A special feature here is that the light exit openings 21 of the individual reflectors 20 have no square or rectangular shape, but instead represent an irregular square, so that there is also a distorted truncated cone shape for the reflector 20. Overall, however, the four light exit openings 21 of the 2x2 reflector grid 30 form a square. This is primarily a

Measure that gives the lamp 100 a pleasing and interesting appearance, since the light output for lighting, for example, a street section is done primarily by the lenses 10 described in more detail below.

Accordingly, it would also be possible, for example, square

Light exit openings 21 for the individual reflectors 20 to choose. The reflector raster 30 formed from the four reflectors 20 is then fastened to the carrier board 55 via a latching pin 31 provided on its underside (see Figure 7), it being understood that other fastening measures may of course also be provided.

In contrast to conventional reflector blinds, however, the reflector rasters 30 in the present inventive solution are merely a secondary element for the light emission of the luminaire 100. Primarily, the light output is determined by the lenses 10 individually associated with the light sources. The shape of the lenses can be taken in particular from FIGS. 10-12, which are so-called TIR (total internal reflection) lenses which initially have a collimator 11 facing the light source. This collimator 11 is, as shown in the present example, rotationally symmetrical in the form of a truncated cone and has an approximately circular recess 12 on its light entry side. The positioning takes place in such a way that the LED projects into this recess 12 and accordingly all the light of the LED falls into the collimator 11. On the lateral surface of the collimator 11 is then carried out in a known manner internal total reflection of the light, so that it is initially aligned substantially parallel. In principle, such TIR lenses are already known with a collimator facing the light source.

In the present example, the light exit region 15 of the lens adjoining the collimator 11 has a fresnel-like structure 16 with the aid of which the light is radiated asymmetrically in a preferred direction. Of the

Light exit region 15 is connected to the collimator 11 via a disc-like intermediate region 14, which, however, does not have a significant influence on the light output, but primarily serves to completely fill the bottom opening 22 of the associated cup-shaped reflector 20 in the assembled state of the optical system. As can be seen in FIG. 4, the reflectors 20 are then arranged at a distance from the board 50 and the light sources, this distance being bridged by the collimator 11 of the respective lens 10.

The fresnel-like structure 16 of the lens 10, which can be seen particularly well in FIGS. 10 and 12, causes an asymmetrical light emission in a preferred direction, as already mentioned. This is achieved in particular by the inclined top surfaces of the individual rib-like Fresnel segments, on which the light in turn is preferably totally internally reflected and then obliquely decoupled as shown in FIG. The orientation of the lens 10 and thus the preferred direction, in which primarily the light emission takes place, is also by a on the

Disc-shaped intermediate portion 14 formed arrow-like mark 14a visible, so that it is immediately apparent in which direction the light is emitted. In this case, the light output of the lens 10 via the Fresnel structure 16 is preferably such that it is no longer or only insignificantly influenced by the reflector 20 surrounding the lens 10.

As can be seen with reference to the markings 14a shown in FIG. 5, it is preferably provided that the four lenses 10 of a single light assembly 50 are each aligned identically so that a light source assembly 50 emits light uniformly in a specific preferred direction. However, the illuminant assemblies 50 used in the luminaire 100 shown in FIGS. 1 and 2 then differ in respect of the orientation of the associated lenses 10, so that each luminous means assembly 50 emits light in a slightly different angular range. An overlay of this resulting eight

Lichtabstrahlrichtungen the lighting assemblies 50 then leads to the overall stretched longitudinally and thus asymmetric light output, as it is, as already mentioned, strived for street lighting. Of course, it would also be conceivable to individually align a single lens 10 in a desired direction and thereby achieve the asymmetrical light output. The illustrated variant, in which all lenses 10 of a light assembly 50 have the same orientation, however, is advantageous in that the failure of a single LED does not adversely affect the total light output of the lamp 100 and is not to be feared that then subregions of the total area to be illuminated are no longer illuminated.

The overall resulting embodiment of a lighting device assembly 50 can then be taken, for example, the representation of Figure 4. That is, the light of each LED is first coupled into the collimator 11 of the associated lens 10 and then radiated via the fresnel-like light extraction region 15 of the lens 10. While the collimator 11 is still arranged below or outside of the pot-like reflectors 20, the light outcoupling region 15 projects into the reflector space. When mounting a lamp assembly 50, the lenses 10 are first placed on the LEDs and then the reflector grid 30 is attached in the next assembly step.

Thus, with the measures described so far, an area to be illuminated can be efficiently illuminated by the luminaire 100 according to the invention. However, there is still the above-described problem that is not or only difficult to see for an observer who is outside of the directly illuminated by the lenses 10 area, whether the lamp 100 is activated at all or not. With the help of the additional optical measures described below, this problem is solved in an elegant way.

A special feature of the lenses 10 used is that, although the light is primarily emitted as desired in the preferred direction defined by the Fresnel structure 16, specifically an at least small further portion of the light laterally or over the circumference of the light exit region 15 is discharged so that it falls on the walls of the cup-shaped reflector 20.

Responsible for this effect are additional decoupling surfaces or structures 17, which are shown in Figure 13 and are responsible for the fact that a small proportion of the light is emitted in other directions, in particular in the opposite direction to the preferred light emission direction out. The (surface) portion of these decoupling surfaces 17 is relatively low, since only a very small proportion of the light is to be used to lighten the surrounding reflector walls. Basically, this effect would also be by a corresponding roughening or reachable by the addition of scattering particles in the lens material, since such a total scattering but the effect of the Fresnel structure 16th

counteracts, is the illustrated form with the help of additional

Lichtauskoppelflächen or Lichtauskoppelstrukturen 17 to prefer. Ideally, however, the lateral decoupling of the second portion of light should occur over the entire circumference of the light exit area, so that in fact the entire

Reflector walls are completely illuminated.

Each lens 10 thus ensures that a first - preferably large - proportion of the light is emitted in the desired preferred direction and a second - preferably smaller - proportion as possible over the entire circumference on the walls of the pot reflector 20 falls. Here is then possible diffuse scattering of the light take place, which causes that in the on state of the lamp 100, the reflector walls appear illuminated even at very shallow viewing angles. That is, even for persons who are outside the actually illuminated area, i. in the directly illuminated by the lenses 10 area, the appear

Reflector walls brighter and it is therefore clear beyond doubt whether the light is activated or not. In this way, the eye is also early the possibility opened, to adapt to the brightness transition when approaching the illuminated area, so then no strong or disturbing glare occur at the transition between a not illuminated by the lens area and a lighted area.

This inventive lighting effect could thus be achieved, for example, that in addition to the special design of the lens, the walls of the reflector are formed diffusely scattering. That is, in a first variant, it would be conceivable that the reflector raster is formed of a material which causes a diffuse scattering, or the reflector surfaces could be provided with a diffusely scattering coating.

However, it is particularly preferred in the present case that the diffuse scattering of the second light component takes place by means of an additional reflector insert, which can be seen in FIGS. 8 and 9 and is provided with the reference numeral 40. The insert 40 is similar in terms of its design and shape of the reflector raster 30, so in turn has four cup-shaped, frusto-conical portions 45, each having a light exit opening 46 and this opposite a circular

Form input port 47. Also with regard to the asymmetrical design of the openings 46 of the insert 40 is similar to the reflector grid 30. The dimensions of the insert 40 are now selected, however, such that the outer contour of the Insert 40 of the inner contour of the reflector grid 30 corresponds, so that the insert 40 can be positively inserted from the top into the reflector grid 30. As well as the reflector grid 30 and the insert 40 is made in one piece, and in the case of the use of individual reflector pots here, the use of individual inserts would be conceivable.

This reflector insert 40 is now made of a transparent material, such as PMMA or PC, which is additionally provided with scattering particles, so that the insert 40 can cause the above-mentioned, the desired scattering of the second light component in total. Thereby, however, that the insert 40 from a

is formed transparent material, the light scattering takes place not only on the surface, but also on the distributed within the material of the insert 40 scattering particles and possibly also on the surface of the underlying

Reflektortopfs, so that a visually very appealing depth effect is achieved and in particular the impression is created that the insert 40 glows altogether when activated light 100. The insert 40 preferably has a substantially constant wall thickness and is inserted into the reflector grid 30 when the assembly 50 is assembled-as can be seen in FIG. 9 -in the final assembly step.

With the help of these measures, therefore, not only the problem underlying the invention is solved, namely that from flat angles out of the on state of the lamp is not recognizable, but beyond, in particular, in the on state of the lamp gives a particularly appealing appearance.

It should be noted that this special combination of reflector and associated light-scattering transparent use is not necessarily on the

shown lens shape is limited, but can also be used in other primary optics.

For this purpose, a further embodiment of a lamp 200 according to the invention is shown in Figure 14, which basically corresponds in its construction of the first lamp 100. Again, therefore, there is a two-part design with a first module 210, which includes the electronic components, as well as a second module 220 containing the lamps, wherein a coupling of both modules 210, 220, can be made such that a pivoting of the lamp module 220 is possible , A difference in the present case, first, is that the number of light sources in the illuminant module 220 is lower, and here only 16 light sources are used, which are distributed over four lamp assemblies.

The basic structure of the lamp assemblies is again identical to that of the lamp according to Figures 1 and 2, but now no asymmetric light distribution is sought, but instead the light should rather concentrated to a certain area to be delivered. As a result, in the luminaire according to FIG. 14, the illuminant assemblies have differently designed lenses. In particular, lenses are now used here, as shown in FIGS. 15 and 16.

These lenses 60 in turn have a frusto-conical collimator section 61, which has a recess 62 facing the light source, whose bottom and lateral surface forms the light entry surface of the lens. In contrast to the lenses 10 of FIGS. 10-13, however, no Fresnel-type light-emitting region 15 is now required by which the light is emitted asymmetrically. Instead, the light exit region 65 of the lens 60 of Figures 15 and 16 by a plane

Surface is formed, over which the collimated by the collimator 61 light is emitted. Ultimately, this has the consequence that the light output is parallel to the axis of rotation of the collimator 61, in which case the primary light output of the lens 60 is subsequently or only slightly influenced by the reflector.

In the bottom region of the collimator 61, a plate-shaped holding part 67 is now provided, which has a defined positioning of the lens 60 on the

Carrier element of the lamp assembly allows. In the assembled state of the lamp assembly 50, in this case the collimator region 61 of the lens 60 ends with the associated light exit surface in the region of the bottom-side opening 22 of the associated pot-type reflector 20.

In this variant too, therefore, the light output is determined primarily by the lens 60 itself, less by the reflector 20. Again, however, stray light can occur, which is used to lighten the peripheral reflector walls of the pot-shaped reflector 20. Also in this case, therefore, either the reflector 20 may be formed diffusely scattering or as in the lamp of Figures 1 and 2 additionally within the reflector grid 30, a corresponding reflector insert 40 may be provided. This either can not be done completely anyway

suppressive stray light emitted by the lens 60 can be utilized. It would also be possible, for example, by the introduction of scattering Particles or structures in the edge region of the light exit surface 65 to emit a slight amount of light such that it illuminates the reflector walls. That is, even in this second illustrated lamp 200, the advantageous effect can be obtained that a person located outside the illuminated area can easily recognize the on state of the lamp 200.

Ultimately, therefore, the concept according to the invention allows extremely effective emission of light into a desired range, despite all the disadvantages hitherto resulting in a strong light control. In this case, of course, the application of the optical system according to the invention is not limited to lights for outdoor use, but can in any types of lights

be made.

Claims

Claims 5

1. An optical system for influencing the light output of a light source, comprising

A pot-like reflector (20) having a light exit opening (21),

A lens (10) which is designed to radiate a first portion of the light via the light exit opening (21) of the reflector (20) in a preferred direction defined by the lens (10) O,

wherein the lens (10, 60) is further adapted to deliver a second portion of the light laterally such that this portion falls on the reflector inner wall.

2. Optical system according to claim 1,

5 characterized

that the output of the first light component is not substantially influenced by the reflector (20).

3. Optical system according to claim 1 or 2,

o characterized

the lens (10, 60) has an approximately frusto-conical collimator region (11, 61) facing the light source.

4. Optical system according to claim 3,

5 characterized

in that the collimator region (11, 61) has a recess (12, 62), whose mantle and bottom surface form a light entry surface of the lens (10, 60).

5. Optical system according to one of the preceding claims,

0 characterized

in that the lens (60) has a substantially planar light exit surface (65).

6. Optical system according to one of claims 1 to 4,

characterized,

5 that defined by the lens (10) preferred direction for dispensing the first

Light component is inclined relative to a perpendicular to the plane of the light exit opening (21) of the reflector (20) standing axis.

7. Optical system according to claim 6, characterized,

a light exit region (15) of the lens (10) has a Fresnel structure (16).

8. An optical system according to claim 7,

characterized,

a scattering structure or scattering surfaces (17) is or are formed on the circumference of the Fresnel structure (16), via which the delivery of the second light component takes place.

9. Optical system according to one of claims 6 to 8,

characterized,

the lens (10) is arranged at least with its light exit region (15) within the reflector (20).

10. Optical system according to one of the preceding claims,

characterized,

in that additionally a pot-like insert (40) which can be used in the reflector (20) is provided which consists of a transparent and diffusely scattering material.

11. An optical system for influencing the light output of a light source, comprising a pot-like reflector (20) which has a light exit opening (21),

• An insertable in the reflector (20), also pot-like insert (40), which consists of a transparent and diffusely scattering material.

12. An optical system according to claim 10 or 11,

characterized,

that the outer contour of the insert (40) corresponds to the inner contour of the reflector (20).

13. Optical system according to one of claims 10 to 12,

characterized,

the insert (40) has a constant wall thickness.

14. Optical system according to one of claims 10 to 13,

characterized,

the insert is made of PMMA or PC.

15. Optical system according to one of the preceding claims,

characterized, that this has a plurality of reflectors (20), which are arranged in a matrix, preferably integrally connected to each other, and together form a grid (30).

16. Luminaire with matrix-like arranged bulbs, which are formed in particular by LEDs, and a light source associated optical system according to one of the preceding claims.