EP2715218A2

EP2715218A2 - Reflector for a streetlamp

Info

Publication number: EP2715218A2
Application number: EP12727110.4A
Authority: EP
Inventors: Peter Schreiber; Chen Li; Maik Schwede; Jens GÖHRING; Christoph Schierz; Andreas Walkling
Original assignee: Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV; Technische Universitaet Ilmenau; Dilitronics GmbH; Jenoptik Polymer Systems GmbH
Current assignee: Jenoptik Polymer Systems GmbH
Priority date: 2011-05-25
Filing date: 2012-05-23
Publication date: 2014-04-09
Anticipated expiration: 2032-05-23
Also published as: CN103748409A; EP2715218B1; DE102011081349A1; CN103748409B; WO2012160101A2; WO2012160101A3

Abstract

The invention relates to a reflector for a streetlamp. The reflector comprises an opening for a lighting means and a reflector surface that extends away from the opening in a center beam direction without deflecting light of the lighting means along the center beam direction. The reflector surface is divided into bands in the center beam direction, which bands are continuously connected to each other along band edges. The band edges have at least one section that comprises curve segments that are continuously attached to each other in a differentiable manner, wherein the section has a first point at which a curvature vector of the section points inward and a second point at which the curvature vector of the section points outward.

Description

Reflector for a street lamp

description

Technical area

Embodiments of the present invention provide a reflector for a street lamp.

Background of the invention

Street lamps are used in particular as LED street light (LED Light Emitting Diode - light emitting diode), for the illumination of outdoor facilities, such as sports fields, parking lots or even industrial plants or in multi-purpose halls used.

Modified lighting with the result of improved light distribution curves are particularly interesting for use in such applications, where changing environmental influences, such as rain, fog, other changing visibility, including in industrial plants (steam generation, changes in natural light, in measurement and test systems in Laboratories or manufacturing facilities, etc.).

The quest for ever better light output while saving energy is generally a demand directed to the development of LEDs as light sources. High brightness LEDs also allow outdoor or industrial lighting applications.

In order to achieve a homogeneous road brightness, the angular distribution of a street lamp should have a so-called bat shape (bat wing shape) along the longitudinal direction of the road. That's not all. A road surface is not normally an ideal surface for diffuse reflection (Lambertian reflection) and has a mixture of directional and diffuse reflection. As a result, the amount of light reflected from a street and perceived by a viewer depends on the relative position of the fixture, the observer, and the point of interest on the street. When light with a certain amount illuminates a point on the street opposite the lamp, compared to the case where the point under consideration between the lamp and the The viewer is reflecting a greater portion of the light back from the street instead of being reflected and viewed along the street. Thus, the distribution of the light intensity along the width direction of the road is not homogeneous or symmetrical, but with more light on the roadside opposite the lamp. When the road is wet, the directional reflection is stronger. This causes an even greater amount of light to be distributed from the luminaire to the opposite side of the street. In addition, a larger amount of light should illuminate the area under the luminaire, as a greater portion of the light striking that area is reflected to the sky. On a wet road, the reflection is higher; thus a lower intensity is needed to reach a certain brightness level. When a lamp is used on a wet road that achieves perfect brightness uniformity on a dry road, dark areas appear across the street and under the lamp and the road is brighter. In summary, the lighting requirement for road light is complicated and the light distribution and intensity differ between dry and wet road surface.

Due to the complexity of street lighting, it is difficult to design them with simple optics with regular shapes.

Summary of the invention

It is an object of the present invention to provide a reflector for a street lamp, which allows both a more homogeneous light distribution, as well as can be produced by conventional methods.

This object is achieved by a reflector according to claim 1. Embodiments of the present invention provide a reflector for a street lamp having an opening for a lamp and a reflector surface extending away from the opening in a central radiation direction, without light of the lamp along the middle To redirect radiation direction. The reflector surface is subdivided in the direction of the central emission direction into bands which connect continuously along band edges. Furthermore, the band edges have at least one section consisting of contiguously and differentially attached curve segments in the form of conical curves, the section having a first point, in FIG wherein a curvature vector of the section faces inwardly and has a second point in which the curvature vector faces outward.

It is a central idea of embodiments of the present invention that a reflector can be provided which allows homogeneous light distribution and can be produced by conventional methods, when the reflector surface of the reflector is subdivided into bands which continuously adjoin one another along band edges. The subdivision of the reflector into bands offers a high number of degrees of freedom for the realization of the reflector. Furthermore, the continuous connection of the bands allows the reflector to be produced by conventional means, such as injection molding.

Further, the configuration of the at least one portion of the band edges enables the curvature vector of the portion to point inwardly in the first point and the curvature vector outwardly in the second point to have a design of the reflector surface with both concave and convex surfaces and thus a high number of degrees of freedom in the design of the reflector surface.

It is thus an advantage of embodiments of the present invention that a reflector for a street lamp can be provided, which allows both a more homogeneous illumination, as well as easily produced by conventional means.

According to further embodiments, curve segments of adjacent band edges may be associated with each other and the reflector surface may each have a connecting line between starting points of two mutually associated curve segments and between end points of the two associated curve segments, so that the two associated curve segments together with the connecting lines form the circumference of a reflector part surface. The reflector can be subdivided into a plurality of reflector partial surfaces, which can have different shapes and sizes depending on the position on the reflector. For example, each reflector sub-area (also referred to as patch), light in a predetermined range (for example, according to a DIN standard) reflect the road. As already mentioned, the band edges can have at least one section in which, at a first point, a curvature vector of the section points inwards and in a second point the curvature vector of the section points outwards. For example, a first curve segment of a first band edge and a second curve segment of a second band edge, which lead to the first band edge in the direction of the central emission direction, have curvature vectors pointing inwards with respect to the reflector (ie, into the reflector). A reflector part surface, which is bounded by this first curve segment and the second curve segment, therefore bulges outwards. The reflector surface is therefore concave in this region of the reflector partial surface. Furthermore, a third curve segment (which, for example, connects continuously and differentially to the first curve segment) and a fourth curve segment (which, for example, adjoins the second curve segment continuously and differentially), which is adjacent to the third curve segment in the direction of the central emission direction, can have curvature vectors which face outward with respect to the reflector (ie away from the reflector). A second, limited by the third curve segment and the fourth curve segment reflector surface can therefore bulge towards the reflector. In other words, the reflector surface may be convexly curved in this region of the second reflector part surface. In other words, adjacent reflector partial surfaces (for example, have alternately different directions of curvature.

The choice of the different directions of curvature for adjacent partial reflector surfaces makes it possible that, even with an increasing number of partial reflector surfaces, tangents at connection points of two curve segments of a band curve can have predetermined minimum angle differences. These minimum angle differences make it possible to suppress artifacts that arise as images of an LED cluster (German: LED arrangement) as a light source. In some embodiments, this angular difference between two tangents at two checkpoints (eg, start point and end point) of a curve segment may be greater than 10 degrees.

According to further embodiments, the reflector may have a back reflector and a front reflector. The front reflector may be subdivided into a first number of bands, and the back reflector may be divided into a second number of bands which is different (e.g., larger) than the first number of bands. For example, the front reflector and the rear reflector each have a band area in which they consist of bands. An extension of the band region of the back reflector in the direction of the central emission direction may be greater than an extension of the band region of the front reflector in the direction of the central emission direction. By this choice of the different extent of the band ranges of the two reflectors, For example, the efficiency of the reflector can be increased and furthermore the desired solid angle distribution (for example in the form of a bat wing) can be achieved.

Brief description of the figures

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Show it:

1a is a perspective view of a reflector according to an embodiment of the present invention;

FIG. 1b shows a further illustration of the perspective view from FIG. 1; FIG.

Fig. 2 is an illustration of two back reflectors of an arrangement of two reflectors as shown in Figs. La and lb.

Fig. 3 is a view of a front reflector of the shown in Figs. La and lb

reflector; FIG. 4a is a bottom view of the reflector shown in FIG. 1a; FIG.

4b shows a further illustration of the bottom view shown in FIG. 4a;

5 shows an exemplary illustration of a luminous means, as it may be used in a reflector according to an embodiment;

FIG. 6 shows a freeform surface, as used for modeling the reflector surface of FIG.

la shown reflector can be used; 7a is a schematic representation of a lighting system according to a

Embodiment of the present invention; and

Fig. 7b illumination patterns, as they can be generated as a function of environmental conditions of the illumination system of Fig. 7a. Detailed description of embodiments of the present invention

Before describing in detail embodiments of the present invention with reference to the accompanying figures, it is pointed out that the same elements or elements of the same function are provided with the same reference numerals and that a repeated description of these elements is omitted. Descriptions of elements having the same reference numerals are interchangeable.

In the following, a reflector 100 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 a to 4 b.

The reflector 100 has an opening 101 for a luminous means 3. The luminous means 3 is shown symbolically in FIGS. 1b, 3 and 4b with a circular area. For example, the luminous means 3 may be a so-called LED cluster, which has a plurality of LEDs. A base of the LED cluster 3 can be chosen arbitrarily, and does not necessarily have to be circular, as shown in the figures.

Furthermore, the luminous means 100 has a reflector surface 103. In this case, the reflector surface 103 is located in the interior of the reflector 100 and serves to reflect light emitted by the luminous means 3 in order to produce a predetermined light distribution for the street lamp.

In Fig. La, 2 and 4a, the reflector 100 is arranged in a three-dimensional X-Y-Z-Koordinatensy system. The X-Y-Z coordinate system has an X-axis, a Y-axis, and a Z-axis, which are perpendicular to each other and thus form the directions of the space.

The reflector surface 103 extends away from the opening 101 in a central emission direction 105, without redirecting light of the luminous means 3 along the central emission direction 105. In the exemplary embodiment shown in FIG. 1a, the mean emission direction 105 runs along the Z axis and thus forms a normal of an XY plane spanned by the X axis and the Y axis.

As mentioned, the reflector surface 103 does not deflect light from the luminous means 3 along the central emission direction 105. In other words, light which is emitted by the luminous means 3 in the direction of the central emission direction 105 does not strike the reflector surface 103 and is thus not deflected, but strikes one directly illuminating area (such as a street). In other words, the reflector 100 has no so-called bridge structure between the opening 100 (for the luminous means 3) and a light exit opening 107 of the reflector 100. Furthermore, the reflector surface 103 is subdivided in the direction of the central emission direction 105 into bands 109a to 109g and 11a to 11d, which adjoin one another continuously along band edges (without jump) and (optionally) not differentially. Each band 109a to 109g, 1 1 1 a to 1 1 1 d may have a first band edge, for example, an upper band edge, and a second band edge, for example, a lower band edge, which the band 109a to 109g, 1 1 1a to 1 1 1d (at least in the direction of the mean radiation direction 105) limit.

The band edges have at least a portion consisting of contiguously and differentially attached curve segments in the form of conical curves, the portion having a first point at which a curvature vector of the portion points inwardly and has a second point at which the curvature vector pointing to the outside. For example, one of the band edges of the reflector has such a portion or a plurality of band edges of the reflector. Thus, for example, a first band edge 1 13a of a band 109c, which is simultaneously a second band edge of a band 109b of the reflector 100, a first curve segment 115a in the form of a first conical curve and a second curve segment 1 15b in the form of a second conical curve. The first curve segment 115a and the second curve segment 15b merge into one another continuously and differentially. A curvature vector of the first curve segment 1 15a points inwards (ie in the reflector 100), while a curvature vector of the second curve segment 1 15b faces outward (ie away from the reflector 100). The first curve segment 15a therefore bulges outward with respect to the reflector 100, ie is concavely curved, and the second curve segment 15b bulges inward with respect to the reflector 100 and is therefore convexly curved.

Furthermore, curve segments of adjacent band edges can be assigned to one another and the reflector surface 103 can each have a connecting line between starting points of two mutually associated curve segments and between end points of two mutually associated curve segments, so that two associated curve segments together with the connecting lines between their starting points and end points the circumference of reflector partial surfaces (also referred to as patches) form. In other words, the reflector surface 103 can be divided into reflector partial surfaces whose convexities can be set via the starting points and end points of the curve segments delimiting them. Such reflector partial surfaces are designated, for example, by reference numbers 51, 52, 53 and 54 and shown in FIG. 2. Thus, for example, the reflector part surface 53 of a first band edge 1 13b of a band 109d and a second band edge 1 13c of the band 109d and two connecting lines 1 16a, 1 16b from the first band edge 1 13b of the band 109d to the second band edge 1 13c of the band 109d clamped. The connecting lines between the starting points or end points of the individual curve segments of the bands 109a to 109g, 11a to 11d can be straight lines.

Adjacent sections of a band edge can either meet in a bent edge of the reflector surface 103 or terminate on an outer surface of the reflector surface 103.

Such a bending edge 1 17 is shown in Fig. La. At this crease edge 17, a first section of the strip edge 13c meets a second section of the strip edge 13c adjacent thereto. This bending edge 1 17 may, for example, lie in a plane of symmetry of the reflector 100. In the case of the reflector 100, the bending edge 17 is located in a Y-Z plane spanned by the Y and Z axes at X = 0, which forms a symmetry plane of the reflector 100. For example, the reflector 100 may include a front reflector 31 and a back reflector 32, where both the front reflector 31 and the back reflector 32 are symmetrical to the Y-Z plane at X = 0, respectively. For example, the front reflector 31 may include a first sub-module 31a and a second sub-module 31b which are symmetrical to each other with respect to the Y-Z plane at X = 0.

Further, the back reflector 32 may include a first sub-module 32a and a second sub-module 32b which are symmetrical to each other with respect to the Y-Z plane at X = 0.

Adjacent sections of a band edge, which meet at a bending edge 1 17 of the reflector 100, may belong to different sub-modules. For example, the first portion of the band edge 1 13c may belong to the first sub-module 32a of the rear reflector 32, and the second portion of the band edge 1 13c adjacent to the first portion may belong to the second sub-module 32b of the back reflector 32. The front reflector 31 and the rear reflector 32 may have a common interface, which lies in a boundary plane. In the described embodiment, this limit plane is formed by an XZ plane at Y = 0. Furthermore, the front reflector 31 may be subdivided into a first number of bands 11a-11d and the back reflector 32 may be subdivided into a second number of bands 109a-109g which are different from the first number of bands 11a-1d 1 is 1d. In the described embodiment, the front reflector 31 is divided into four bands 1 1 1 a to 1 1 1 d and the back reflector 32 is divided into seven bands 109 a to 109 g.

Due to the different degrees of subdivision of the front reflector 31 and the Rückre- reflector 32 can be achieved that more light is reflected forward (towards the street), as to the rear (towards the roadside or pedestrian path).

The band edges 109a to 109g, 11a to 11d can each be arranged in mutually parallel band edge planes. The mean emission direction 105 can form a normal of these mutually parallel band edge planes. In the described embodiment, the band edge planes are spanned by the X-axis and the Y-axis and are spaced apart in the Z-direction, ie along the direction of the central emission direction 105. The X-Y planes in which the band edges run are thus perpendicular to the plane of symmetry of the reflector 100 and the boundary plane in which the boundary surface of the front reflector 31 and the rear reflector 32 is located.

Distances between two consecutive band edges in the direction of the emission direction 105 are therefore constant in the direction of the central emission direction 105. In other words, the heights of the individual bands 109a to 109g, 11 1a to 1 1 1d are each constant.

Furthermore, the opening 101 may also lie in an X-Y plane parallel to the band edge planes or in a band edge plane itself (for example at Z = 0).

Furthermore, band edge spacings of the bands 109a to 109g, 1111a to 1112d may increase with increasing distance from the opening 101 (with increasing Z). In other words, a first distance between two band edges of a first band (eg, band 109a) may be less than a second distance between two band edges of one band band second band (for example, the band 109e), which is arranged in the direction of the central emission direction 105 after the first band 109a.

The reflector 100 may form an illumination system or a light source together with the luminous means 3, and the mean emission direction 105 may be, for example, an average emission of the luminous means 3 (for example averaged over the angular distribution of the luminous means 3).

Adjacent bands can connect continuously but not differentiable to each other. In other words, the reflector 100 may have kinks between adjacent bands.

An extension of the reflector 100 in the X-direction, that is to say along a degree of intersection of the boundary plane and that of a band edge plane, can be selected to be at least 3.5 times as large as an extension of the luminous means 3 along these cutting levels.

Further, the front reflector 31 may have a band portion in which it consists only of bands 11a to 110d, and the back reflector 32 may have a band portion in which the back reflector 32 consists only of the bands 109a to 109g. An extension of the band region of the back reflector 32 in the direction of the central emission direction 105 (ie along the Z-axis) is greater than an extension of the band region of the front reflector 31 in the direction of the central emission direction 105. As already explained, this can serve to achieve the desired To achieve radiation characteristic of the reflector 100 in conjunction with the bulb 3, that is, more light is reflected on the road, as to the roadside (such as the footpath).

The front reflector 31 may instead have a plane reflector plate 33, which adjoins the band region of the front reflector 31 and extends from the band region of the front reflector 31 in the direction of the central emission direction 105.

In the following, the reflector 100 will be described in more detail.

The reflector 100 has two different reflectors, the front reflector 31 and the rear reflector 32. The front reflector 31 is directed in an application to the center of the road, which is in front of the lamp. The rear reflector 32, unlike the front reflector 31, is oriented toward a pedestrian lane or roadside behind the lamp. The reflector 100 (and thus also the front reflector 31 and the back reflector 32) are mirror-symmetric with respect to the YZ plane at X = 0. The reflector 100 has a number of bands 109 a to 109 g, 1 1 1 a to 1 1 1 d, and mechanical components 36 for fastening and the molding process. Furthermore, the reflector 100 has surfaces for blocking unwanted light paths. Such a surface is the reflector plate 33.

A band 109a to 109g, 11a to 11d of the reflector 100 is an optically active surface of the reflector 100 which extends from Zmin to Zmax. A band 109a to 109g, 11a to 11d can be a ruled surface formed by sweeping a straight line segment (eg, connecting lines 16a, 16b) whose endpoints moving along different paths (eg, along the band edges), which are curves defined respectively in different XY planes with control points (eg, start and end points of curve segments). A curve segment between two control points is defined by a conical curve whose tangents at control points coincide with those of an adjacent curve segment, making the entire curve uniform (continuous and differentiable). 6 shows such a free-form which is such a control surface formed by varying a straight line segment 1a, 1b, whose end points move along different paths, which are curves 12a, 12b, 12c, each in different XY Levels are defined with control points 10. A maximum absolute value of the tip angle 13 from the X axis to the curve tangent is 75 degrees in the example in FIG. 6, which ensures that the designed optics can be made by polymer injection molding. As already mentioned, two adjacent bands (and also two adjacent patches) share a same trajectory or band edge 12b. Advantages of using such a free-form piece are that injection molding defects such as molding defects on sharp bonds or edges of the developed surface produced by manufacturing boundaries can be avoided, and greater flexibility for a complicated shape design is enabled.

In other words, an acute angle between a curve tangent at a starting point or an end point of a curve segment of a belt and the X axis or the boundary plane may be 75 degrees or less. In other embodiments, this may apply to all start and end points of the curve segments of a section of a band. A band is determined by two curves (band curves), which in turn can consist of sections consisting of conical curves attached to each other. Each band curve is determined by a series of control points (for example, start and end points of adjoining curve segments in the form of conic curves).

A tangent parameter at control points can be adjusted such that a surface segment formed by each pair of corresponding curve segments (such as a reflector sub-surface) reflects light, avoiding artifacts from the images of the individual LEDs. The relative positions of two corresponding curve segments are adjusted such that the formed surface segments (or reflector sub-areas) reflect light away into the illumination area and away from the LED centerline 2 (or from the central emission direction 105) as far as possible. Optimization of the reflector 100 is accomplished by varying the parameters of tangents and positions of control points.

The reflector 100 has a plurality of reflector partial surfaces or patches (for example the reflector partial surfaces 51, 52, 53, 54).

Adjacent bands share a common band curve and show a continuous but not smooth profile. For example, adjacent bands may merge smoothly (without jumps) but not differentiable (due to edges),

A reflector patch or patch is that part of a band spanned from adjacent control points (eg, from a start and an end point of an upper band curve of the band and a start and an end point of a lower band curve of the band).

The control points (that is, for example, the start and end points of the curve segments) have as parameters X-Y-Z positions in the X-Y-Z coordinate system of the reflector 100 and a tangent direction (in the XY plane) at the control points. A curve segment connecting two adjacent control points in a series of control points is defined as follows.

The function used to construct a curve segment between two control points pl (Xj, y) and p2 (x ₂ , y ₂ ), with ( ₂ f> \ x | in which in which

in which

K is the conical parameter. In these formulas:

in which Angle 13 of curve tangents at control points p1 and p2 are and is the acute angle 14 between the x-axis and the connecting line between these two control points.

This function can be written in the form of a Bezier curve: where P ₀ , P ₁ , P ₂ and w _{1 are} defined factors for reproducing the conical curve. When defining two curve segments of different trajectories

are, then points on the surface, which are determined by these two curve segments, can be calculated as follows:

A center of the luminous means 3 (for example in the form of an array of LEDs, so-called LED cluster) is arranged in the origin of the XYZ coordinate system of the module development space and LED center lines 2 (as shown, for example, in connection with a luminous means 1 in FIG are) parallel to the Z axis. The LED center lines can therefore be identical to the central emission direction 105. The reflector itself or the module is designed in the + Z range.

The retractor 100 is reflection symmetric and the symmetry plane is the YZ plane at X = 0. Since the reflector 100 is symmetrical, the design can be limited to only one half of the reflector (for example, to the first sub-module 3 l a of the front reflector 3 1 and the first sub-module 32a of the rear reflector 32). The reflector 100 is subdivided into different bands whose band curves extend in XY planes. The reflection surface of each band is a ruled surface. A reflector face in a band is a surface segment of a continuous ruled surface, so there are no obvious boundaries between two (adjacent) reflector faces of a band.

The reflector 100 also has the following structures:

Bent strip ends: The part 21 of each strip which adjoins one (outer) edge of the reflector 100 is bent in the direction of the XZ plane at Y = 0 (ie in the direction of the border plane between the front reflector 31 and the back reflector 32), to prevent light 41 from hitting the reflective surface of an adjacent reflector (in an array of multiple reflectors, such as shown in FIG. 2), which would otherwise result in stray light 42. An advantage of these curved band ends is that light 43 is reflected in order to achieve the desired illumination pattern (so-called illumination pattern). The reflector partial surfaces, which adjoin reflector partial surfaces of an adjacent reflector, have the additional function of blocking light emitted by the light source and more than 80 degrees away from the light source Center line 2 or the central radiation direction 105 is deflected and would otherwise dazzle an observer on the road.

Reflector surface 103 limited by restriction planes: The reflector part surfaces are delimited by bottom surfaces 23, 24. A bottom surface 23 lies in a boundary plane 25, which extends between a + Y edge of the luminous means 3 and a -Y edge of the illumination region. A bottom surface 24 lies in a boundary plane 26 which extends from a -Y edge of the luminous means 3 to a + Y edge of the illumination region. The edges of the illuminant 3 or the cluster edges and the edges of the illumination area or the illumination area edges are parallel to the X-axis. In this way, all the light emitted from sources and deflected out of the illumination area is collected, and further the possibility that light from other clusters (from other bulbs 3) that are not combined with the reflector 100 (e.g. an adjacent reflector 100) impinges on the reflection surface of the reflector 100 is further reduced.

The following describes the design process and the principle of the formation of the individual reflector partial surfaces. The ribbons located closest to an LED cluster mounting plane (for example, in the form of a PCB-printed circuit board) are first designed. In other words, the bands having the least Z component, for example, which are closest to the aperture 101 are first designed. For each of the bands first designed, the design starts with a given control point (starting point), which lies on the Y-axis and is close to the LED cluster 3. Thereafter, the rest of the control points are set in an ordered order.

The rest of the bands (or reflector bands) are also defined in an ordered order and share a series of control points with a previous band. According to the definition for the bands, there are no profile discontinuities (no jumps) and each band has a smooth (eg smooth) surface.

The reflector partial areas can be coded as follows: The first designed band is Bl, the first reflector partial area in the Bl band of the front reflector 31, which has the predetermined control point at X = 0, Y = 10, Z = 0, is F. Pchl; the first reflector sub-area in the Bl band of the back reflector 32, which is the predetermined control point at X = 0, Y = -10, Z = 0, B.Bl.Pchl (also designated by reference numeral 51 in Fig. 2); the next band is B2, etc. The reflector sub-area in the B2 band which shares the same band edge curve segment with B l. Pchl is B2.Pchl, such as. BBB2.Pchl in Fig. 2 (also provided with the reference numeral 52). The reflector partial area, which follows Pchl in the positive X-axis direction, is Pch2, etc. The reflector partial area, which follows Pchl in the negative X-axis direction, is Pch-1, etc. In addition, the reflector partial areas B.B4.Pch-2 (FIG. also designated by reference numeral 53) and B.B4.Pch4 (also denoted by reference numeral 54) are shown in FIG. At the beginning of the design, the number of control points and bands is now minimized to keep the simulation fast. In addition, the X-dimension of the reflector 100 is also set to a minimum value.

The parameters for the control points for the default setting are as follows: Each reflector sub-surface reflects light to a predetermined area on the road according to the DI specification. The curvatures of the reflector partial surfaces are chosen so as to avoid artifacts that arise due to the individual images of the individual LEDs.

In addition, the orientations of the reflector partial surfaces are selected so that double reflection is prevented and the light is deflected as far as possible from a position of the street lamp.

An additional rule used in the design process is: To avoid artifacts created by the LED cluster, an angle between two tangents at two control points of a curve segment (for example, between a start point and an end point of the curve segment) becomes greater than 10 ° selected. The closer the reflector sub-area is to the YZ plane at X = 0 (that is, the closer the reflector sub-area is to the plane of symmetry), the greater this angle difference is selected. According to one embodiment, the maximum value of this minimum difference may be 15 °. In other words, a first tangent of a curve segment at an initial point of the curve segment may deviate at least an angle of 10 ° from a second tangent of the curve segment at an endpoint of the curve segment, and this angle may increase with decreasing distance from the plane of symmetry. This can be true according to further embodiments for all sections of band curves of the sub-modules 31a, 31b of the front reflector 31 and the sub-modules 32a, 32b of the rear reflector 32 apply. In other words, for each curve segment of a band curve, a first tangent of that curve segment at a starting point of the curve segment may deviate at least an angle of 10 ° from a second tangent of the curve segment at an endpoint of the curve segment.

To achieve the desired brightness distribution, optimization is performed to determine the number and height of the bands as well as the X dimension of the reflector 100.

The larger the X-dimension, the better the scattered light can be controlled with the reflector 100. For example, the control of double or multi reflection in the reflector 100 becomes simpler and light can be reflected farther away from the LED centerline 2. As a result, the light exploitation efficiency is improved.

However, a larger reflector 100 will inevitably lead to a larger lamp, which is typically not desirable by a manufacturer. Therefore, a good compromise between extension of the reflector and optical behavior must be found.

The Z-dimension of the back reflector 32 is influenced by the X-dimension of the reflector 100 as well as the restriction plane 25.

The Z dimension of the front reflector 31 is chosen to maximize the light exploitation efficiency. If the Z dimension is chosen too large, certain light paths will be blocked, resulting in stray light and reducing efficiency. If the Z dimension is set too small, too little light will be reflected by the reflector 100 to achieve the desired brightness distribution or illumination distribution and more light will be reflected from the reflector plate or reflector surface 33 and will not reach the road area.

The smaller the height, the smaller the illumination pattern of a single reflector part surface, which leads to a higher flexibility in the design of the illumination pattern. Otherwise, an increasing number of reflector faces or patches will make simulation of the reflector slower. The heights of the bands are chosen so that the closer a band is to the printed circuit board on which the luminous means 3 is arranged, the lower its height.

In other words, increases with increasing in the direction of the emission direction 105 distance from the opening 101, a height of the bands (for example in the direction of the emission direction 105).

Hereinafter, exemplary values for the dimensions of the reflector 100 will be given.

An X-dimension of the reflector 100 without the additional mechanical components 36 can be set to 80 mm. According to some embodiments, the X-dimension of the reflector 100 may be selected to be 3.5 times greater than the X-dimension of the LED cluster 3.

The heights of the bands of the front reflector 31 from F.B1 to F.B4 may be 2, 4, 7 and 8 mm. In some embodiments, the front reflector 31 may include at least three bands. For a first back reflector 32 (eg, for a so-called wet reflector 100), the heights of the bands from B.B1 to B.B7 may be 2, 4, 5, 6, 6, 6, and 11 mm.

For a second back reflector 32 (for example, for a so-called dry reflector 100), the heights of the bands from B.B1 to B.B7 may be 2, 4, 5, 6, 7, 8 and 8 mm

In some embodiments, the front reflector 31 may include at least five bands. The specified height values are measured in the Z-axis direction, ie in the direction of the mean emission direction 105.

As a next optimization step, the number of reflector subareas in a band and the X positions of the control points can be determined.

If z. For example, if the curve segments are selected in the form of circle segments (the conic constant K is set to 0), then the Y position of the second control punkts a calculated value. Thus, apart from the starting control points of the reflector sub-surface (s) Pchl, the Y-positions of the control points are not variables.

In addition, in this step, the Y positions of the tape start control points can be optimized.

The larger the number of reflector partial surfaces, the more flexible the desired reflector shape can be created and the more flexible the illumination pattern can be set. However, with an increasing number of reflector sub-areas, the speed for the simulation may become slower.

A good compromise for a minimum number of reflector faces is 10 reflector faces per band (from Pch-3 to Pch7). Furthermore, it has been found that the closer the reflector sub-area is to the LED cluster, the smaller the size of the reflector sub-area should be.

In some embodiments, X-intervals from control points of the reflector surfaces from Pchl to Pch3 may be less than 3 mm and from B.Pch-1 to B.Pch-7 and from S.Pch-1 to S.Pch-6 less than 2 mm be.

In order to keep the minimum angle differences between the tangents described above and to be able to form the given reflector structure, the reflector partial surfaces can have alternately convex and concave shapes as the number of reflector partial surfaces increases. In other words, curve segments may alternate with curvature vectors pointing inward and curve segments with curvature vectors pointing outward.

Considering that light, which is reflected by a reflector part surface, not to be blocked or deflected by another part of the reflector 100 and directly on the surface to be illuminated (for example, the road) meet and taking into account special functions of the individual reflector partial surfaces, the Reflector part surfaces are assigned to different lighting areas and manually optimized. In the reflector 100, the reflector sub-areas B.Pch-7 to B.Pch4 reflect light in an area X> 10 m on the road. The reflector partial surfaces of B.Pch5 to B.Pch7 reflect light in a range of -5 m <X <15 m, Y> 3 m on the road.

The reflector sub-areas B.Pch8 and B.Pch9 reflect light in an area X <-5 m, Y> 3 m on the street (blocked light 41). These reflector partial surfaces in the bands B 1 and B2 prevent glare.

The reflector partial surfaces B.PchlO reflect light in an area X> -5 m on the road and form a transition structure (to an adjacent reflector) to avoid a molding error.

Reflector subfaces F.Pch-7 to F.Pch-8 reflect light in a range of -5 m <X <5 m, Y> 3 m on the road. The reflector partial surfaces F.Pch-6 to F.Pch3 reflect light in an area X> 10 m on the road.

The reflector partial surfaces F.Pch4 to F.Pch9 reflect light in a range 5 m <X <15 m on the road and block light which, like the light 41, would produce stray light. In addition, these reflector partial surfaces in the bands Bl and B2 prevent glare.

An automatic optimization can be carried out to finally achieve the required lighting effect. This automatic optimization can be carried out with a so-called merit function. Optimized parameters are mainly the tangent directions at the control points, with the curve segments set as circle segments. In embodiments where this is not the case, the Y positions of the control points are also variables. In addition, the X and Y positions of the control points of the reflector part surface Pchl be optimized. Only for a small number of other partial reflector surfaces can the X position or the Y position be optimized by manual intervention.

The above merit function can be based on a simulated brightness distribution map on the road surface. It may have various factors including total and longitudinal uniformity according to the street lighting standards (DIN EN 13201 standard ME3 and MEW3 lighting classes for dry and wet roads), usable light transmission to the street, light pollution and glare control. Considering manufacturing constraints, additional constraints may be introduced, such as a maximum absolute acute angle from the X axis to a 75 ° curve tangent, and the radius of the reflection surface 103 greater than 0.5 mm.

As already described, a free-form reflecting surface of the + Y module part 31 (of the front reflector 31) has a shorter Z dimension than that of the -Y module part 32 (of the back reflector 32), resulting in optical optimization for forming a required illumination pattern and to improve the light utilization rate. Between the maximum Z value of the free-form reflecting surface of the front reflector 31 and the maximum Z value of the entire reflector 100, the reflection plate 33 is arranged. With an optimized inclined angle about the X-axis, the reflection plate 33 has a flat surface that passes a lower edge line 34 of the module, which is simultaneously a cut line of the restriction plane 26 and the Z dimension restriction plane 35 of the entire reflector 100. This part (the reflection plate 33) prevents light from hitting other clusters and reflects the light to the illumination area.

FIG. 7 a shows an illumination system 700 according to an exemplary embodiment of the present invention. The illumination system 700 has a first reflector 701a and a second reflector 701b, which are arranged parallel to one another on a common carrier, for example in the form of a printed circuit board 703. For example, the reflectors 701a, 701b may have been designed using the design method described above, and thus may be similar to the reflector 100, for example.

Furthermore, the illumination system 700 has a first illumination means 705a, for example in the form of a first LED cluster, and a second illumination means 705b, for example in the form of a second LED cluster. The first lighting means 705a is disposed on the support 703 so as to be seated in an opening 101a of the first reflector 701a, so that light emitted from the first lighting means 705a along the central radiation direction thereof is not blocked or blocked by the first reflector 701a is diverted. Similarly, the second light emitting means 705b is disposed on the carrier 703 so as to be seated in an opening 101b of the second reflector 701b, so that light emitted from the second light emitting means 705b along the central radiation direction thereof is not blocked by the second reflector 701b or is diverted. A combination of an LED cluster or a light source together with a reflector can form a light source. A street lamp is typically formed from a panel of such light sources, an electrical driver, a housing and a cover glass.

As already shown in the reflector 100, the first reflector 701a and the second reflector 701b may each include a front reflector and a back reflector. In the example shown in Fig. 7a, the first reflector 701a has a front reflector 731a and a back reflector 732a, and the second reflector 701b has a front reflector 73b and a back reflector 732b.

According to further exemplary embodiments, the illumination system 700 can also have a plurality of such reflectors 701a, 701b with associated light sources 705a, 705b, which are arranged, for example, in a field on the common carrier 703.

According to some embodiments of the present invention, the reflectors 701a, 701b may be identical, and thus also the front reflectors 731a, 731b and the back reflectors 732a, 732b are identical. In this case, the two reflectors 701a, 701b have an identical space angle distribution, so that when one of the illumination means 705a, 705b fails, the space angle distribution in an illuminated area does not change but only the flux (the brightness).

According to further embodiments, the reflectors 701a and 701b may also differ from each other to produce variable illumination patterns. This can be useful, for example, to adapt a lighting pattern of the lighting system, which can be used for example in street lamps, depending on environmental conditions. For example, with the illumination system 700, an LED street lighting may be provided that employs LED clusters as the light sources 705a, 705b and that includes the two different types of reflective optics or reflectors 701a, 701b and includes, for example, a street having two variable illumination patterns Depending on conditions, such as wet or dry, can be illuminated to improve the uniformity of the brightness and the light utilization rate. In other words, the reflectors 701a, 701b may be adapted to the various environmental conditions, such as wet or dry, and the illumination system 700 may be configured to use the illuminants 705a, 705b of the light source 705a, 705b, depending on environmental conditions, for example, detected by an internal or external sensor Lighting system 700 on and off.

The LED clusters can be arranged in a matixarray (matrix field) in a plane in which a mounting plate (for example the surface of the carrier 703) is arranged at the same time. LEDs of at least one chromatic type may be used in the LED clusters and arranged identically in these clusters on the carrier 703. Despite the chromatic type, each LED of one of the LED clusters 705a, 705b may have the same energy angle distribution that can be described by the following formula: wherein the relative intensity of an LED at a given angle Θ is at the light along the LED center line 2, which is normal to the surface of the LED mounting plate (the carrier 703). γ is an adaptation parameter, which in embodiments of the present invention may be 0.5128, which describes an energy angle distribution at a half-peak of 75 ° (diverging angle of 150 °) greater than the divergence angle of the Lambert's often encountered in high power LEDs Radiation characteristic is. The preferably use of strongly divergent emitting LEDs allows the realization of short reflectors in Lichtausbreitungs- direction.

The two types of reflectors or reflective optics modules 701a, 701b may be referred to as WET or DRY. Each of the reflectors 701 a, 701 b is combined with a single LED cluster or a single light source 705a, 705b, so that the illumination system 700 has an array (field) of reflectors 701 a, 701 b. Each cluster 705a, 705b having the same reflector 701a, 701b has an identical energy distribution pattern, resulting in a linearly additive array device. In other words, in embodiments in which the illumination system 700 has a plurality of reflectors 701 a with associated illuminants 705 and a plurality of reflectors 701b with associated illuminants 705b, in which the reflectors 701a are different from the reflectors 701b, FIGS Combinations of the reflectors 701 a in conjunction with the luminaires For example, at 705a, a first common energy angle distribution and the combinations of the reflectors 701b in conjunction with the bulbs 705b have a second common energy angle distribution that is different than the first energy angle distribution.

Light emitted by the light sources 705a is thus superimposed linearly additive, just as light emitted by the light sources 705b.

The change of the illumination pattern dependent on the road surface conditions can be realized by turning on and off the LED clusters or bulbs 705b combined with DRY modules (eg, reflectors 701b). For a wet road surface illumination, the LED clusters 705b and 705b are turned off with the DRY modules (reflectors 701b), and a lighting pattern is provided only by those LED clusters 705a or 705a with NASS modules (eg, reflectors 701a) , which are optically designed and optimized to achieve improved uniformity of brightness on a surface having a reflection characteristic defined with the reflection table CIE W4. A DRY module (eg, reflector 701a) is designed and optimized to provide the difference in illumination intensity distribution between the illumination pattern provided by LED cluster 705b or illuminator 705b with NASS modules (reflectors 701b) and a second illumination pattern Achieves improved uniformity of brightness on a surface with a reflection property, which is defined with the reflection table CIE R3 to compensate.

In order to achieve these functionalities, the design process described above for designing the reflectors 701a, 701b has been devised, which is used for the design of both reflectors 701a, 701b to produce reflector structures that can control stray light resulting from multi-reflection of light generated by other LED clusters is emitted, and in which all the light and only the light which is reflected and redirected, is light which is led out of the illumination area by the LEDs (for example, light which is different from the central emission direction) , This allows the remaining part of the light emitted from the LEDs to reach the illumination area directly without being reshaped, thus minimizing the energy loss caused by absorption of the reflection surface 103. As explained above, the NASS modules and the TROC EN modules may differ from one another in that they have different heights. According to one embodiment, the front reflectors 731a, 731b are identical in the two reflectors 701a, 701b, while only the back reflectors 732a, 732b differ from each other, for example in that the heights of their bands are different. For example, the heights of the bands in the back reflector 732b of the reflector 701b (ie, in the NASS module) from B.B1 to B.B7 may be 2, 4, 5, 6, 6, 6, and 1 mm, while in the back reflector 732a of the reflector 701a (ie the DRY module), the heights of the bands from B.B1 to B.B7 can be 2, 4, 5, 6, 7, 8 and 8 mm. FIG. 7b shows a lighting pattern on the left as it can be emitted by the lighting system 700 in wet environmental conditions. In this case, only the LED cluster 705b or the illuminant 705b, which is combined with the second reflector 701b (ie, with the NASS module), is switched on, while the LED cluster 705a or the illuminant 705a, which is connected to the first reflector 701a (ie, combined with the DRY module) is turned off.

FIG. 7b shows on the right side a lighting pattern of the dry ambient lighting system 700 in which both the light source 705a and the light source 705b are switched on.

In the following, some aspects of exemplary embodiments are explained in summary.

Embodiments of the present invention utilize curved free-form reflector facets or facets. An advantage of this is that no artifacts of LED clusters are projected onto the road, which allows better color mixing.

In other words, in embodiments of the present invention, no measures must be taken to illuminate a dark area under a street lamp in which the reflector 100 is used, and further, none exist Artifacts of LED clusters, therefore, no color mixing optimization must be performed.

By means of the curved reflector partial surfaces at the ends of the bands of the reflector 100, it can be achieved that light which is emitted to an adjacent cluster does not end up in a light pollution but reaches the road surface, thus the stray light problem does not have to be in the above-mentioned merit function be considered.

Embodiments of the present invention provide a lighting system (for example, in the form of a lighting design) for providing various light distributions depending on road or foundation or soil or soil or terrain and / or environmental conditions that operates with an LED cluster matrix array. which is arranged in a plane and has two types of reflection optical modules (reflectors 701a, 701b) designed with the same optical modeling approach that applies free-form surfaces.

Further embodiments of the present invention provide an illumination system in which each of the LED cluster LEDs has at least one chromatic type LEDs on a planar surface that is the same as the plane of the cluster array.

Further embodiments of the present invention provide an illumination system in which LEDs of all types have the same angular distribution, which has a cylindrically symmetrical distribution with the greatest possible divergence angle of e.g. up to 150 °.

Further embodiments of the present invention provide an illumination system in which each of the LED clusters is optically combined with a reflective optics module (such as the reflectors 701a, 701b) to provide a lighting pattern on a roadway that is the same as that through a laser A plurality of LED clusters with the same type of module (or with the same reflector) is provided.

Further embodiments of the present invention provide a lighting system in which the module (the reflector) to form a desired pattern reflects only the light emitted from the LEDs, which is deflected out of the illumination area, which is the remainder of the light emitted from the LEDs allows to reach the lighting area without being reshaped. Further embodiments provide a reflector in which each of the free-form patches (eg, each of the bands) is a ruled surface formed by varying a straight segment whose endpoints move along different paths (for example, along the band edges) that are curves in each case in two levels with two control points, where the curves run evenly.

According to further embodiments, a curve segment between two control points may be defined with a conical curve whose tangents at the two control points coincide with those of an adjacent curve segment. In other words, two adjoining curve segments of a section of a band edge can have the same slope at their points of contact, so that the two curve segments merge into one another in a continuous and differentiable manner. According to further embodiments, two adjacent bands (and thus also two adjacent reflector sub-areas) may share a same trajectory (band edge, for example) in one reflector.

Further embodiments of the present invention provide a reflector in which a portion of each band adjacent to an edge of the reflector bends to the XZ plane to prevent light from hitting the reflective surface of an adjacent module or reflector Scattering light while reflecting light to form a desired illumination pattern. Further embodiments of the present invention provide a reflector in which the reflector sub-areas reaching those of the other side (of the other reflector) have another function of blocking light emitted from the light source which is more than 80 ° from the center line (of the middle emission direction 105) is deflected.

Further embodiments of the present invention provide a reflector in which the reflector part surfaces and / or the bands are bounded by a bottom surface 23, 24 of a reflector or module lying on a restriction plane between an edge of the light source or the LED cluster and a Edge of the illumination area, which are both parallel to the X-axis, is arranged. Other embodiments of the present invention use within an LED cluster both appropriately driven white and monochrome, such as blue and / or red, LEDs to achieve a high electro-optical conversion efficiency of the LED cluster and a high quality of light with very good color rendering. In other words, in embodiments, an LED cluster may include a plurality of LED groups, wherein LEDs of different LED groups radiate in different colors and emit LEDs of a group in the same color.

Further embodiments of the present invention provide a lighting system that provides light distribution with wet road reflectors of the NASS type, meaning that only the LED clusters coupled to a NASS-type reflector are activated.

Monitoring the radiation of the individual modules (reflectors in combination with the light sources) or the individual LED groups of a cluster, such as built-in or coupled via optical fibers detectors or sensors allows safe operation of the lamp and the compensation of temperature or aging-related changes the electro-optical conversion efficiency of the LEDs by readjusting the driver currents. The readjustment of the driver currents can be carried out separately for the individual LED groups of the LED clusters and in particular for each LED cluster in the case of an arrangement of several LED clusters in one field (such as, for example, in the illumination system 700). For detecting the radiation of the light sources (formed from a reflector and a light source or LED cluster), the light sources may comprise sensors. Such a sensor can be arranged, for example, on the reflector surface 103 of the reflector 100. It has been found that a good position for a sensor is in a region of the reflector surface 103 of the reflector 100 in which the first band 11a of the front reflector 31 intersects the symmetry plane of the reflector 100. Exemplary embodiments therefore provide a reflector 100 which has a sensor which is arranged in a region of the reflector surface 103 of the reflector 100, in which the first belt 111 in the direction of the central propagation direction 105 intersects the symmetry plane of the reflector 100. Such a sensor may in the simplest case be an optical fiber which is connected to a detector (such as a photodiode or an array of photodiodes). The detector may, for example, be a color sensor which makes it possible to measure the emission of the individual LED groups of the LED cluster of a light source and to control their driver currents separately from one another. Further embodiments of the present invention provide a lighting system that provides light distribution with both wet-type and dry-type reflectors for a dry road, meaning that all LED clusters are activated.

For weather-dependent and optionally traffic and ambient light-dependent control of the lights, a central control unit with suitable sensors can be connected via suitable communication channels, such as e.g. Wireless or a wired connection to the respective lamp to be connected.

Additionally or alternatively, remote sensors and control units may adjust the light flux and radiation of the lighting system to the weather and optionally the traffic flow and ambient brightness. In other words, lighting systems according to exemplary embodiments can adapt their radiation in addition to the weather-dependent adaptation as a function of other environmental conditions. This adjustment can be made both by activating and deactivating individual LED clusters (for example from NASS or DRY modules) and by dimming (varying the driver currents) of the LED clusters. In summary, embodiments of the present invention provide a reflector or reflective optics, for example for an LED street lamp.

Further embodiments provide a lighting system, for example for such a street lamp.

Claims

claims

A reflector (100, 701a, 701b) for a street lamp, comprising: an opening (101, 101a, 101b) for a lamp (3, 705a, 705b); and

a reflector surface (103) which extends away from the opening (101, 101a, 101b) in a central emission direction (2, 105), without light of the luminous means (3, 705a, 705b) along the central emission direction (2, 105) redirect;

wherein the reflector surface (103) is subdivided in the direction of the central emission direction (2, 105) into strips (109a to 109g, 11a to 11d) which continuously adjoin one another along strip edges (13a to 13c); and

wherein the band edges (1 13a to 13c) comprise at least a portion consisting of contiguously and differentially attached curve segments (115a, 15b), the portion having a first point in which a curvature vector of the portion faces inwards and a second point in which the curvature vector of the section faces outward.

2. reflector (100, 701a, 701b) according to claim 1, wherein cam segments (1 15a, 1 15b) of adjacent band edges (1 13a to 1 13c) are associated with each other;

wherein the reflector surface (103) between the starting points of two mutually associated curve segments and between end points of the two associated curve segments each having a connecting line (1 16a, 1 16b), so that the two mutually associated curve segments together with the connecting lines (1 16a, 1 16b) form the circumference of a reflector part surface (53).

3. reflector (100, 701a, 701b) according to claim 2,

wherein the connecting lines (1 16a, 116b) are straight lines.

4. reflector (100, 701a, 701b) according to one of the preceding claims,

wherein adjacent portions of a band edge meet either in a bending edge (1 17) of the reflector surface (103) or on an outer surface of the reflector surface (103) terminate.

5. reflector (100, 701a, 701b) according to one of the preceding claims,

wherein a first curve segment of a first portion of a band edge (1 13c) and a second curve segment of a second portion of the band edge (1 13c), which meets the first portion in a bending edge (1 17) of the reflector surface (103) have identical curve parameters.

6. reflector (100, 701a, 701b) according to one of the preceding claims,

wherein the average radiation direction (2, 105) forms a normal of a plane in which the opening (101, 101a, 101b) is located.

7. reflector (100, 701 a, 701 b) according to one of the preceding claims, wherein band edges (11a to 13c) of different bands (109a to 109g, 11a to 11d) extend in mutually parallel band edge planes.

8. reflector (100, 701a, 701b) according to claim 7,

wherein the central radiation direction (2, 105) forms a normal of the band edge planes.

9. reflector (100, 701a, 701b) according to one of the preceding claims,

wherein the band edge distances between adjacent band edges increase with increasing distance of the band edges from the opening (101, 101a, 101b).

10. reflector (100, 701 a, 701 b) according to one of the preceding claims,

further comprising a front reflector (31, 731a, 731b) and a back reflector (32, 732a, 732b);

wherein the front reflector (31, 731a, 731b) is subdivided into a first number of bands (1 1 1a to 1 1 ld), and the back reflector (32, 732a, 732b) is divided into a second number of bands (109a to 109g) different from the first number of bands (109a to 109g) is partitioned.

1 1. Reflector (100, 701a, 701b) according to claim 10,

wherein the front reflector (31, 731a, 731b) or the rear reflector (32, 732a, 732b) has a first sub-module (31a, 32a) and a second sub-module (31b, 32b), wherein in which the first submodule (31a, 32a) and the second submodule (31b, 32b) are symmetrical to each other.

12. Reflector (100, 701a, 701b) according to claim 1 1,

wherein bending edges (1 17) of the reflector surface (103) in the adjacent portions of band edges (1 13c) of the front reflector (31, 73 la, 73 lb) or the back reflector ((32, 732a, 732b) meet in a plane of symmetry of the sub-modules (31a, 31b, 32a, 32b) of the front reflector (31, 731 a, 731b) or back reflector (32, 732a, 732b) extend.

13. Reflector (100, 701a, 701b) according to one of claims 10 to 12,

wherein the front reflector (31, 731a, 731b) and the back reflector (32, 732a, 732b) have a common interface lying in a boundary plane which is perpendicular to band edge planes in which the band edges (1313a to 1313c) extend.

14. Reflector (100, 701a, 701b) according to claim 13, when related to claim 1 1,

wherein a plane of symmetry of the sub-modules (31a, 31b, 32a, 32b) of the front reflector (31, 731a, 731b) or the back reflector (32, 732a, 732b) is perpendicular to the boundary plane and the band edge planes.

15. Reflector (100, 701 a, 701 b) according to one of the preceding claims, wherein the band edges have at least a portion consisting of adjoining circle segments of different radii, which merge smoothly and differentially into each other.

16. Reflector (100, 701a, 701b) according to one of the preceding claims,

wherein a first tangent of a curve segment at an initial point of the curve segment deviates at least an angle of 10 ° from a second tangent of the curve segment at an endpoint of the curve segment.

17. Reflector (100, 701a, 701b) according to one of the preceding claims,

wherein, for each curve segment, at least one section of a band edge which extends from an outer edge of the reflector surface (103) to a further outer edge of the reflector surface (103) or a bent edge (17) of the reflector surface

(103), a first tangent of the curve segment at an initial point of the curve segment deviates at least an angle of 10 ° from a second tangent of the curve segment at an endpoint of the curve segment.

18. Reflector (100, 701 a, 701 b) according to one of the preceding claims,

wherein angles between tangents at starting points of curve segments of band curves and tangents at endpoints of the curve segments increase with decreasing distance of the curve segments to a symmetry plane of the reflector (100, 701a, 701b).

19. Reflector (100, 701a, 701b) according to one of the preceding claims, further comprising a front reflector (31, 731a, 731b) and a back reflector (32, 732a, 732b);

wherein the front reflector (31, 731a, 731b) and the rear reflector (32, 732a, 732b) have a common interface lying in a boundary plane;

wherein an extension of the reflector (100, 701 a, 701b) in a direction of a line of intersection of the boundary plane and a band edge plane in which a band edge extends, at least 3.5 times as large as an extension of the illuminant (5, 705a, 705b) along the cut line is.

20. Reflector (100, 701a, 701b) according to one of the preceding claims,

wherein the front reflector (31, 731a, 731b) and the rear reflector (32, 732a, 732b) each have a band area in which they consist of bands (109a to 109g, l la to 1 1 1 d); and

wherein an extension of the band region of the back reflector (32, 732a, 732b) in the direction of the central emission direction (2, 105) is greater than an extension of the band region of the front reflector (31, 731a, 731b) in the direction of the central emission direction (2, 105) ,

21. Reflector (100, 701 a, 701 b) according to claim 20, wherein the front reflector (31, 731a, 731b) has a reflector plate (33) which adjoins the band region of the front reflector (31, 731a, 731b) and extends from the band region of the front reflector (31, 731 a, 731b) in the direction of extends in the middle emission direction (2, 105).

22. A reflector according to one of the preceding claims, further comprising a front reflector (31), a rear reflector (32) and a sensor; wherein the sensor is arranged in a region of the reflector surface (103), in which intersect in the direction of the central radiation direction (105) first band (l i l a) of the front reflector (31) and a plane of symmetry of the reflector.

23. Lighting system with the following features:

a reflector (100, 701a, 701b) according to one of the preceding claims; and

a lighting means (3, 705a, 705b);

wherein the central emission direction (2, 105) is a central emission direction of the luminous means (3, 705a, 705b).

24. Lighting system with the following features:

a reflector (100, 701a, 701b) according to any one of claims 1 to 22;

a lighting means (3, 705a, 705b); wherein the lighting means (3, 705a, 705b) comprises a plurality of LED groups, wherein LEDs of different LED groups radiate in different colors and emit LEDs of the same LED group in the same color, respectively; and

wherein the illumination system is designed to detect brightnesses of the individual LED groups separately from one another and to set drive currents for the individual LED groups as a function of the detected brightnesses.

25. Reflector arrangement with the following features:

a first reflector (701a) according to one of the preceding claims;

a second reflector (701b) according to one of the preceding claims;

the first reflector (701a) having a first front reflector (731a) and a first back reflector (732a);

wherein the second reflector (701b) has a second front reflector (731b) and a second rear reflector (732b); and

wherein the first front reflector (731a) is equal to the second front reflector (731b), and the first back reflector (732a) is different from the second back reflector (732b).

26. Reflector arrangement according to claim 25, wherein an extension of the first return reflector (732a) in the direction of the central emission direction (2, 105) of the first reflector (701a) is identical to an extension of the second return reflector (732b) in the direction of the central emission direction (2, 105) of the second reflector (701b ), but at least two bands of the first return reflector (732a) have a different extension in the direction of the central emission direction

(2, 105) of the first reflector (701a), as an extension of two corresponding bands of the second return reflector (732b) in the direction of the central emission direction (2, 105) of the second reflector (701b).

27. Reflector arrangement according to one of claims 25 or 26,.

wherein a number of the bands of the first back reflector (732a) is equal to a number of the bands of the second back reflector (732b).

28. Lighting system (700) with the following features:

a first reflector according to one of claims 1 to 22;

a second reflector according to any one of claims 1 to 22;

a first lighting means (705a) disposed in the opening (101a) of the first reflector (701a); and

a second lighting means (705b) disposed in the opening (101b) of the second reflector (701b);

wherein the first reflector (701a) is different from the second reflector (701b); and wherein the illumination system (700) is configured to activate only the second reflector (701b) in response to an information signal describing an environmental condition for a first condition of the environmental condition and both the second reflector (701b) for a second condition of the environmental condition ) as well as the first reflector (701a).

29. Illumination system (700) according to claim 28,

wherein the first lighting means (705a) and the second lighting means (705b) as well as the first reflector (701a) and the second reflector (701b) are arranged on a common carrier (703).

30. The illumination system of claim 28, further comprising a controller configured to provide a further information signal in response to another environmental condition; and wherein the illumination system (700) is designed to dim the first illuminant (705a) or the second illuminant (705b) in dependence on the further information signal which describes the further ambient condition.

31. Lighting system arrangement with the following features:

a plurality of illumination systems according to any one of claims 28 to 30; and a central control section configured to provide the information signal for the plurality of lighting systems depending on the environmental condition.