Patent Publication Number: US-2010110693-A1

Title: Light fixture

Description:
The invention relates to a light fixture according to the introductory clause of claim  1 . 
     Such light fixtures are known and have been developed and produced by the applicant for some time. They serve for illuminating building surfaces. These are, for example, floor, wall, or ceiling surfaces of a building, but also surfaces outside a building, such as parking areas, landscaping, or paths. Paintings and art objects to be illuminated are also included in the building surfaces according to claim  1 . 
     Light fixtures of conventional construction comprise at least one light source, a so-called illumination means, which is mounted inside an essentially bowl-shaped reflector. Starting from the light source, direct light is reflected from the illumination means onto the building surface in the light fixtures according to prior art, and indirect light is reflected on facets of an inner surface of the reflector onto the building surface. 
     In certain applications it is desirable to generate on the building surface a light distribution that is asymmetrical with regard to its shape and/or with regard to the distribution of intensity. It may also or optionally be desired to generate a light distribution that deviates from the shape of the edge of the reflector, or from the shape of the edge of a light output opening of the light fixture with regard to the shape of the fixture&#39;s reflector. 
     A rotationally asymmetrical light distribution means according to the invention particularly a light distribution that, relative to a longitudinal center axis of a reflector being formed in an essentially rotations-symmetrical manner, has no rotational symmetry. 
     In case of a rotationally asymmetrical reflector that is also within the scope of the invention, such as an axially elongated reflector, rotationally asymmetrical light distribution means according to the present patent application particularly, for example, also a light distribution curve that deviates from the shape of the edge of the reflector with regard to the shape thereof. Finally, a rotationally asymmetrical light distribution also means one that has one or more focal points such that a rotationally asymmetrical distribution of intensity is the result. 
     The object of the invention is to provide a light fixture that allows the generation of focal points in the light distribution onto the building surface and/or that enables the generation of rotationally asymmetrical light distributions to a currently unequaled degree. 
     The invention solves the problem by means of the characteristics of claim  1 , and is therefore characterized in that an inner surface of the reflector has at least one first sector and a second sector, wherein a major portion of light coming from the light source and impinging on the first sector is reflected from the first sector onto the building surface, and wherein at least a substantial portion of the light coming from the light source and impinging on the second sector falls on the building surface reflection off the first sector. 
     The principle of the invention is therefore essentially that the reflector is made in a modified manner as opposed to the prior art, and the interior of the reflector is subdivided into different sectors at a spacing from each other with different reflection characteristics. For this purpose at least one first sector and one second sector are provided. 
     A sector in terms of the present patent application is any contiguous surface or grouped together region of the inner surface of the reflector that makes up a substantial part of the total area of the reflector and overall performs a general light-deflecting function. In particular the first sector and the second sector each comprise an area of at least one percent of the total inner surface of the reflector. Advantageously, the first sector and the second sector each comprise a rectified area of at least three percent of the total inner surface of the reflector, further advantageously at least 5%, further advantageously at least 10%, further advantageously at least 15%, and further advantageously at least 20%. 
     The inner surface of the reflector in particular is made in one piece with a first sector that deflects that light coming from the light source and directly impinging the first sector directly onto the building surface. The reflector comprises a second sector on its inner surface that has a surface that is formed differently from the first sector. The light coming from the light source and impinging on the second sector is initially reflected off that location and is bounced back to the first sector by reflection. These light portions impinge on the building surface only after further reflection off the first sector. 
     The light fixture according to the invention enables the deflection of portions of the light emitted by the light source at certain angles that were previously not reachable by the light fixture or have not been able to be illuminated with light to a desired degree. In this manner those light portions impinging on the second sector may now be deflected at steep angles due to a further reflection off the first sector, which were previously not reachable by means of an indirect reflection of the light portions on the second sector. 
     It is therefore possible with the light fixture according to the invention to deflect light portions from the first sector at an angle such that these light portions comprise both light portions coming from the light source and reaching the angle after only one reflection off the first sector and also light portions being subjected to a first reflection off the second sector, and a second reflection off the first sector. Therefore the reflector of the light fixture according to the invention may deflect a greater beam of light at pivot angle than the light fixture according to the prior art. 
     The inner surface of the reflector may be formed with a plurality of segments having individually formed surfaces. For this purpose the segments in the first sector may be formed with different shapes than the segments of the second sector. Preferably, the entire inner surface of the reflector is occupied by segments. The segments may be formed in the form of facets, and may have an arcuate or protruding surface toward the interior of the reflector. In particular the surface of each segment is arcuate at least once, optionally also twice. In this manner cylindrical shape may in particular be used in the second sector. 
     The segments in the first sector may also be equipped with planar reflection surfaces. 
     The remaining sectors of the inner surface of the reflector, which are not part of the first or the second sectors, may also be occupied by facets. 
     The previously mentioned facets or segments are made in the shape of pillows, and are advantageously provided on the inner surface of the reflector according to a uniform structural array. The structure may comprise rows particularly extending angularly, and columns extending crosswise thereto. Preferably, the segments are arrayed in concentric circular rings. 
     Relative to the angular direction of the reflector, the first sector and the second sector are spaced from one another. The invention preferably provides that the first sector and the second sector are positioned opposite of each other. Further, both sectors are advantageously positioned opposite of each other at about 180°. 
     In other words, a geometric arrangement is provided such that the first sector is on a first side of the illumination means, and the second sector is on a second side opposite of the side of the illumination means. 
     In one embodiment of the invention multiple first sectors and multiple second sectors may be provided. Those light portions coming directly from the illumination means and impinging on one of the multiple second sectors are each reflected coming from there onto a first opposite sector. From there the light is emitted onto the building surface. 
     The double reflection of the light portions described is preferably carried out such that those light portions emitted onto regions of the second sector or onto one of multiple second sectors coming from the illumination means are reflected back by it onto the first sector or onto one of the multiple first sectors. The reflected-back light portion may particularly cut the longitudinal center axis of the reflector, or extend in direct proximity of the longitudinal center axis. 
     According to an advantageous embodiment of the invention the first sector is formed contiguously. This means that a substantial circumferential angular sector of the inner surface of the reflector is formed from, for example, between 5° and 180° such that it reflects the light portions coming directly from the light source impinging on it out onto the building surface. Those light portions impinging on it from the second sector are reflected onto the building surface by the first sector. 
     The formulation according to which the first sector is formed contiguously means in the case of a provision of the inner surface of the reflector with a plurality of individual facets that the facets are provided right next to each other. 
     The formulation according to which a sector of the inner surface of the reflector is formed contiguously means that the sector may be surrounded by a closed edge or shape. To this end, the interior of the surface surrounded by the shape makes up a substantial portion of the inner surface of the reflector, i.e. a portion of the total surface of the reflector of more than one percent. 
     According to a further advantageous embodiment of the invention the second sector is also contiguous. 
     The invention further advantageously provides that the light coming from the light source and impinging on the first sector is essentially deflected onto the building surface completely by the first sector. In this embodiment of the invention the efficiency of the light fixture is very high, i.e. any losses of light beams are kept low. Nearly the entire light coming directly from the light source and impinging on the first sector is directly deflected onto the building surface. 
     According to a further advantageous embodiment of the invention the major portion of light coming from the light source and impinging on the second sector impinges on the building surface only due to a further reflection off the first sector. In this embodiment of the invention it becomes obvious that substantial light portions, i.e. beyond a random range, are reflected toward the substantial, i.e. palpable, projections of a total beam of light to be deflected into a certain pivot angle from the second sector onto the first sector before they impinge on the building surface. 
     Advantageously the light fixture is mounted in a locally fixed manner. This use as a building light. Furthermore, the reflector is advantageously mounted in the housing. This enables the use of known configurations. 
     It is further advantageous that the reflector is centered on a longitudinal center axis essentially in a rotation-symmetrical manner with regard to its basic shape. The longitudinal center axis of the reflector is the axis positioned perpendicular to a light output opening of the reflector. 
     This enables particularly the production of a reflector for the light fixture according to the invention by means of plastic punch deformation of an aluminum blank. Such a production process is described, for example, in German patent application DE 10 2007 035 528.0 [US 2009/0034271] by the applicant. The content of disclosure of the above cited patent application is included in the content of the present patent application herein, also for reference purposes with regard to individual features. 
     The longitudinal center axis of the reflector in the sense of the present invention corresponds to the pivoting axis of the blank during the production process, based on the production process of the reflector by means of a pushing action of an aluminum blank. 
     It should be noted that in addition to a production of the reflector made from aluminum it is also possible to form the reflector as a plastic die cast component, and to subsequently equip it with a reflecting inner surface, such as by means of vapor coating. 
     Advantageously the invention further provides that the reflecting inner surface of the reflector is shaped such that the light distribution generated from the light fixture is configured in an asymmetrical manner relative to the longitudinal center axis of the reflector. This means that with an arrangement of a reflector being shaped essentially in a rotation-symmetrical manner based on the configuration thereof, which also has a circular light output opening, a light distribution is generated that deviates from a rotational symmetry relative to the longitudinal center axis with regard to the shape thereof and/or with regard to the distribution of intensity thereof and/or optionally also with regard to the position thereof. 
     According to a further advantageous embodiment of the invention the inner surface of the reflector is occupied by a is plurality of segments in a rotationally asymmetrical arrangement. This enables the embodiment of a light fixture according to the invention for achieving a rotationally asymmetrical light distribution using a reflector that is rotation-symmetrical with regard to the configuration thereof. A desired light distribution may be achieved only by means of the special arrangement of the plurality of segments, which are preferably arrayed on a grid, and by means of the calculated shape of the arches of the surfaces, or by positioning and aligning planar reflection surfaces of the segments. 
     Also advantageously the inner surface of the reflector is occupied completely by segments shaped like facets. This enables the achieving of low illumination densities on the surface of the reflector such that any glare can be kept at a minimum for the viewer of the reflector. 
     The invention further advantageously provides that segments of a first type are provided in the first sector and segments of a second type are provided in the second sector. The segments of a second type are formed differently from the segments of the first type. Advantageously, the segments of a second type in the second sector are formed by cylindrical facets. Such facets are described, for example, in the German patent application DE 10 2007 035 396.2 [US 2009/0034272] by the applicant. The content of the patent application is included in the content of the present patent application in order to avoid repetition, but also for reference purposes of the individual features. 
     According to a further advantageous embodiment of the invention segments having planar surfaces are provided in the first sector. At this location segments are therefore provided that have a planar surface. In this manner the portions of light beams may be reflected at the respective angles in the desired and in a particularly advantageous and optimized manner. 
     The invention further advantageously provides that the light fixture is embodied as a pole-mounted light fixture. Accordingly, the light fixture comprises a long pole at whose upper end the reflector is mounted. Such a pole-mounted light fixture serves for illuminating exterior surfaces in a particularly advantageous manner, such as parking surfaces. 
     As an alternative the invention also provides that the light fixture according to the invention is embodied as a down light. In this manner certain ground or wall surfaces of a building may be washed with light in a particularly advantageous manner. 
     Finally, an alternative embodiment of the invention provides that the light fixture according to the invention is a spotlight for the purpose of flooding walls with light. To this end, it may be provided in particular that the circular light output opening present in the case of a dished reflector that is made rotational-symmetric with regard to the base shape thereof, is aligned along a plane that is not aligned parallel to the ceiling. Therefore, a side wall of a building, for example adjacent to the light fixture, may be homogeneously illuminated in a particularly optimized manner, or if desired, also using focal points. 
    
    
     
       Further advantages of the invention become obvious from the non-cited sub-claims and with reference to the following description of the illustrated embodiments illustrated in the drawings. Therein: 
         FIG. 1  is a schematic, partially sectored side view of a first embodiment of the light fixture according to the invention, here a spotlight, and mounted on the ceiling for illuminating a wall surface, 
         FIG. 2  is an enlarged detail view of a further embodiment of the light fixture according to the invention where the reflector is illustrated in a cross-sectoral view, and where an illumination means engages into an hole at an apex of the reflector, 
         FIG. 3  is a very schematic detail interior view of a further embodiment of a reflector of a light fixture according to the invention approximately corresponding to a view according to the viewing arrow III in  FIG. 2 , 
         FIG. 4  is another very schematic view like  FIG. 3  of a reflector where there is a different division of the inner surface of the reflector, 
         FIG. 5  shows the light distribution of an embodiment of the light fixture according to the invention in a polar coordinate view, 
         FIG. 6  is a first schematic view showing explaining the dotted curve of in  FIG. 5 , 
         FIG. 7  is a further schematic view explaining the curve in  FIG. 5  illustrated as a solid line in a view approximately along the intersecting line VII-VII in  FIG. 6 , 
         FIG. 8  is a further schematic view explaining a rotationally asymmetrical light distribution, in a view similar to that of  FIG. 6 , the light fixture  10  of  FIG. 8  having been pivoted about a horizontal axis SW through 90° from the light fixture position of  FIG. 6 , 
         FIG. 9  is a schematic line view of a further embodiment of a reflector of a light fixture according to the invention in an interior view, approximately along the viewing direction of the viewing arrow III in  FIG. 2 , 
         FIG. 10  shows the reflector of  FIG. 9  in a view with a plurality of added detail, 
         FIG. 11  shows the reflector of  FIG. 9  in a perspective angular view, approximately according to viewing arrow XI in  FIG. 9 , and 
         FIG. 12  is a further embodiment of the light fixture according to the invention in a view similar to  FIG. 1 , where the light fixture is a spotlight mounted on the ground. 
     
    
    
     The light fixture according to the invention shown generally at  10  in the drawing will now be explained with reference to several embodiments. It should be noted with regard to the following description that identical or similar parts or elements are identified by the same reference symbols for reasons of clarity, adding lower case letters to simplify matters. 
       FIG. 1  shows in a very schematic, partially sectored side view a first embodiment of a light fixture  10  according to the invention, here a spotlight and mounted on a ceiling  11  of a room of a building. In case of a ceiling mount particularly a side wall  13  may be illuminated in this manner. In case of other not is illustrated embodiments, however, it is also conceivable to illuminate a floor  12 , or to illuminate both a side wall  13  and a floor  12 . 
     The light fixture  10  has a housing  15  in which a reflector  16  is completely recessed. The light fixture  10  is suspended from a mount  14  from the ceiling  11  and can pivot about and be locked relative to an axis SW. The light fixture of  FIG. 1  is a spot light. However, the invention also comprises other embodiments of light fixtures, such as down lights, which are preferably recessed in a ceiling  11  but can also be pole-mounted light fixtures, with a light fixture is mounted on a support pole in the manner shown in  FIG. 1 . 
       FIG. 1  schematically shows a base  18  inside the housing  15  holding a lamp  17 , the illumination means. The illumination means  17  extends through a hole  44  at an apex  45  of the reflector  16 , and projects into an interior  46  thereof. A plurality of light beams is emitted by the illumination means  17 .  FIG. 1  shows only by way of example four light beams that clarify the principle according to the invention. 
     A first light beam  19   a  is emitted from the illumination means  17 , impinges on the reflector  16 , in fact on the upper sector thereof as show in  FIG. 1 , is reflected there, and is cast onto the side wall  13  as a light beam  19   b.  The same applies to the other light beam  20   a  that also impinges on the reflector coming directly from the illumination means  17  and is cast onto the side wall  13  as a light beam  20   b.  This is different for the light beams  21   a  and  22   a.  The light beam  21   a  coming from the illumination means  17  is falls on the lower sector of the reflector  16 , is reflected off that location as a light beam  21   b,  and subsequently impinges again on the upper sector of the reflector  16  with regard to  FIG. 1 . From there it is cast by the reflector onto the side wall  13  as a light beam  21   c.    
     The same applies to the light beam  22   a  that is also initially cast onto the lower sector of the reflector  16  by the illumination means  17 , is reflected there, and is reflected back onto the upper sector as a light beam  22   b,  and is cast there against the side wall  13  as a light beam  22   c.    
     This principle is further clarified with reference to the following description of  FIG. 2 : 
       FIG. 2  shows the reflector  16  of the light fixture  10  according to the invention in an enlarged detail view. The essentially parabaloid basic shape of the reflector can be seen. The illumination means  17  is mounted with its light-emitting point basically at the focal point  43  of the reflector  16 . The illumination means  17  penetrates through the hole  44  at the apex  45  of the reflector. 
     The reflector has an inner surface  30  that is highly reflective. It should be noted that the reflector is preferably made from pressed aluminum. In order to produce such a reflector, reference can be made, for example, to German patent application DE 10 2007 035 528.0 of the applicant, the content of which is included by reference in the present patent application for the individual features. 
     The reflector  16  is rotation-symmetrical on its outside, which determines its basic shape. In this regard it is shaped like a bowl centered rotation-symmetrically on a longitudinal axis M. 
     An array of segments is provided on the inner surface  30  of the reflector  16 , like facets and each having an arcuately convex surface turned toward the interior  46  of the reflector  16 . In the case of a reflector consisting of aluminum, the segments are pressed from the base material. 
     The reflector  16  of the light fixture  10  according to the invention has a first sector  25  on the inner surface  30  with segments  24   a,    24   b,    24   c,    24   d,    24   e,    24   f,    24   g,    24   h,    24   j,    24   k,    24   l,    24   m,    24   n,    24   o,    24   p,    24   q,    24   r,    24   s,    24   t,    24   u,    24   v,    24   w.  A second sector  27  is provided opposite of the sector  25  with other segments  26   a,    26   b,    26   c,    26   d,    26   e,    26   f,    26   g,    26   h,    26   j,    26   k,    26   i,    26   m,    26   n ,  26   o,    26   p,    26   q,    26   r,    26   s,    26   t,    26   u,    26   v,    26   w.    
     The segments of the first sector  25  are shaped differently from the segments of the second sector  27 ; i.e. they have a reflecting surface that is shaped differently. 
     Starting at the illumination means  27 , which is preferably made as a punctiform light source, a plurality of light beams impinge on the segments  24   a,    24   b,    24   c,    24   d,    24   e,    24   f,    24   g ,  24   h,    24   j,    24   k,    24   l,    24   m,    24   n,    24   o,    24   p,    24   q,    24   r,    24   s,    24   t,    24   u ,  24   v,    24   w  of the first sector  25 , and from there are reflected directly onto the side wall to be illuminated, which is shown as a dotted line in  FIG. 2  and indicated at  13 . It should be noted that the geometric alignment of the reflector  16  to the side wall  13  is not drawn to scale in  FIG. 1 , but should be construed merely as a schematic view. 
     The direct light portions that are subjected to only a single reflection off the first sector  25  will be described below with reference to the light beam  29  taken by way of example. Coming from the illumination means  17  the light beam  29   a  impinges on the segment  24   a  of the first sector  25 , and is reflected there directly as a light beam portion  29   b,  and therefore cast directly onto the side-wall surface  13 . 
     The same applies to the remaining light beams of the beam extending from the illumination means  17  in  FIG. 2  toward the right. 
     This is not the case for those light beams that come from the illumination means  17  and impinge on the segments  26   a,    26   b ,  26   c,    26   d,    26   e,    26   f,    26   g,    26   h,    26   j,    26   k,    26   i,    26   m,    26   n,    26   o,    26   p ,  26   q,    26   r,    26   s,    26   t,    26   u,    26   v,    26   w  of the second sector  27  of the reflector  16 . The path will be clarified by way of example with reference to the light beam  28 . From the illumination means  17  the light beam  28  initially falls on the reflecting surface of the segment  26   a.  From there the light beam does not go out of the reflector  16 , but is reflected back toward the first sector  25 . In fact, the light beam  28   b  impinges on the segment  24   a  of the first sector  25 . From there the light beam  28   b  is reflected onto the side-wall surface  13  as a light beam  28   c.    
     The same is true for the remaining light beams of the ray beam, which, coming from the illumination means  17  in  FIG. 2  go to the left. 
     According to the invention part of the light is reflected twice, namely the portion coming from the illumination means  17  and impinging on the segments  26   a,    26   b,    26   c,    26   d,    26   e,    26   f,    26   g,    26   h ,  26   j,    26   k,    26   i,    26   m,    26   n,    26   o,    26   p,    26   q,    26   r,    26   s,    26   t,    26   u,    26   v ,  26   w  then on the segments  24   a,    24   b,    24   c,    24   d,    24   e,    24   f,    24   g,    24   h ,  24   j,    24   k,    24   l,    24   m,    24   n,    24   o,    24   p,    24   q,    24   r,    24   s,    24   t,    24   u,    24   v ,  24   w  of the first sector  25 , and from there onto the building surface  13  after leaving the reflector  16 . 
     Due to the shape of the inner surface  30  of the reflector  16  according to the invention, the side wall  13  may be impinged with higher light beams in its lower region as shown in  FIG. 1 . The same applies in a reversed arrangement of the reflector  16  within the housing  15 , as shown in  FIG. 1 , but as an alternative, an upper sector, or a different sector of the side wall  13  of the building may also be more strongly illuminated using the focal points. 
     As shown in  FIG. 3  a clarification follows on how the inner surface  30  of the reflector  16  may be, for example, divided into four angular segments A, B, C, and D. 
     The first sector  25  may be provided, for example, by the angular segment C, and may extend, for example, over an angle α of about 90°. 
     The second sector  27  may also extend, for example, over an angle β of about 90°. 
       FIG. 3  shows that those light beams that impinge the first sector  25  directly from the punctiform illumination means  17  are reflected from there directly toward the exterior, and leave the reflector  16 . This applies, for example, to the light beam  31   a  that leaves the light fixture  10  after reflection off the first sector  25  as a light beam  31   b.  The same is true for the light beam  32   a  that leaves the reflector as a light beam  32   b  after reflection off the first sector  25 . 
     Those light beams that impinge on regions of the second sector  27  from the illumination means  17  are initially reflected there, then cast onto the first sector  25 , and only then are reflected from there to the exterior. In this manner the light beam  33   a,  for example, coming from the illumination means  17 , is reflected off the second sector  27 , and cast onto the first sector  25  from there as the light beam  33   b.  From there the light beam leaves the reflector  16  as the light beam  33   c  only after further reflection. The same applies to the light beam  34   a,  which, coming from the illumination means  27 , is initially reflected off the second sector  27 , and is reflected back onto the first sector  25  as the light beam  34   b.  From there the light beam leaves the reflector  16  as the light beam  24   c  after further reflection. 
     The segments B and D of the reflector  16  contribute to the reflection in a conventional manner. The inner surface  30  of the reflector sector serves to cast light beams coming from the illumination means directly toward the exterior. The sectors B and D therefore do not receive any light beams coming from the second sector  27 . 
     For example, the light beam  35   a,  coming from the illumination means  17 , is reflected off the sector D, and leaves the light fixture as the light beam  35   b.  The same applies to the light beam  36   a,  which, coming from the illumination means  17 , is reflected by the sector B, and leaves the light fixture from there as the light beam  36   b.    
       FIG. 3  shows the inner surface  30  of the reflector  16  of  FIG. 2  merely in a schematic view. The viewer should imagine the inner surface  30  of the reflector  16  of  FIG. 3  as being covered by a plurality of facets. To this end, for example, similar to the manner in which it was previously described by the applicant in the cited patent application, these may be segments, formed by arcuate surfaces convex toward the interior. However, they may also be any other suitable sectors or bent surfaces of the reflector, regardless of the base shape thereof. For example, the segments may also be embodied in an elongated manner, or in an overlapping manner. 
       FIGS. 1 to 3  illustrated that the double reflection, for example, enables the obtaining of a preferential light direction. For example, focal points on building surfaces may be obtained, regions of the building surface  13  near or far from the light fixture  10  may be illuminated utilizing a light distribution that is aligned along a preferred direction. 
     It will be clarified as shown in the embodiment of  FIG. 4  that a division of the inner surface  30  of the reflector  16  may also be carried out in a modified manner: 
       FIG. 4  shows that the inner surface  30  of the reflector may, for example, also be divided into six segments A, B, C, D, E, and F. Here, the segments B and F are constructed to reflect back, that is reflect the light portions coming directly from the light source  17  back onto the segment D. 
     Segment D is considered the first sector  25  of the inner surface  30  of the reflector  16 . Segment B is considered the second sector  27   a,  and segment F is considered a further second sector  27   b  in the sense of the present patent application. 
     Those light portions impinging on the sector  27   a,  which, coming from the light source  17 , impinge on the sector  27   a,  are reflected from there onto the first sector  25 , and leave the reflector only after being reflected therefrom. The same applies to light beams that come from the light source  17  and initially impinge on the sector  27   b.  This will be described below. 
     The light beam  38   a,  coming from the light source  17 , initially impinges on the second sector  27   a,  is then reflected onto the first sector  25  from there, and is reflected out of the light fixture as the light beam  38   c.    
     In this regard  FIG. 4  shows that the reflector surface  30  may also be divided into multiple segments. It is important, however, that the first sector  25  and the second sectors  27   a,    27   b  are contiguous, e.g. are surrounded by a common perimetric line, but are spaced from each other. 
     The remaining light beams  37 ,  39 ,  40 ,  41 , and  42  illustrated by arrows correspond to the light beam paths described in  FIG. 3  with regard to the meaning and path thereof. 
     As shown in  FIG. 8  it shall now be described that the light fixture  10  according to the invention, serves, for example, for the production of a rotationally asymmetrical light distribution, relative to the longitudinal center axis M of the reflector. 
       FIG. 8  shows in a very schematic view the light fixture  10  of  FIG. 1  viewed toward the ground  12 , approximately in a view taken along the partial sector line VI-VI in  FIG. 1 . To this end, it shall be assumed that the light fixture  10  or the reflector  16  is aligned such that a plane formed by the circular light output surface  47  of the reflector  16  is aligned essentially parallel to the ground  12 . The longitudinal center axis M of the reflector  16  is therefore positioned perpendicular to the ground  12 . In this case it may be assumed that the side wall  13  does not receive any light. Instead, the entire light emitted by the light fixture is cast onto the ground  12 . 
     The light fixture  10  of  FIG. 8  generates a rotationally asymmetrical light distribution LV. The same has any desired shape K, and any desired path of intensity within the surface surrounded by the shape K. A rotationally asymmetrical light distribution in the sense of the present patent application is any light distribution, which has no rotational symmetry relative to the longitudinal center axis M of the reflector  16 . The light distribution curve LV of  FIG. 8  is such a rotationally asymmetrical light distribution, because it is not rotation-symmetrical relative to the longitudinal center axis M, and extends away, particularly on one side, from the longitudinal center axis M. 
     As shown in  FIGS. 5 to 7  the following shall clarify as to how the light distribution can be concretely measured in a reflector  16  according to  FIG. 2 . 
       FIG. 7  shows a very schematic view similar to  FIG. 1 . Here, one difference to the view of  FIG. 1  is that the spotlight  10  has been pivoted clockwise about a pivot axis SW by about 20°, as shown in the view of  FIG. 1 , e.g. such that the longitudinal center axis M is now positioned essentially perpendicular to the side wall  13 . 
     The arcuate double-headed arrow γ in  FIG. 7  shows the 180° pivot angle, toward which the reflector  16  opens. The curve  48  illustrated in the polar coordinate system of  FIG. 5  in a solid line shows, as seen in the view of  FIG. 7 , the path of intensity of the light distribution as a function of the pivot angle γ. To this end, the degree references seen in  FIG. 5  have been correspondingly adopted in  FIG. 7 . 
       FIG. 6  shows in a very schematic view a light fixture according to the invention in its mounting position of FIG.  1 , 24  this regard it should be noted, however, that here the reflector  16  is also frontally aligned to the side wall  13  at the light output hole  47  thereof. 
     The pivot angle δ also corresponds to a 180° angle. Here, a respective angle description is carried out in further conformance to the view of  FIG. 5 . 
       FIG. 5  shows in a dotted curve line  49  the path of intensity of the light distribution as a function of the angle δ. The view of  FIG. 6  shows that an essentially symmetrical light distribution curve can be achieved relative to the longitudinal center axis M, along the pivot angle δ. 
     On the other hand the curve  48  of  FIG. 5  shows that a preferential direction relative to the pivot angle γ can be achieved with the light fixture  10  according to the invention. The preferential direction becomes possible due to the double reflection according to the invention, and described above. 
     As shown in the embodiment of  FIG. 3  it should be noted that the segments in the first sector  25 , have, for example, a particular surface of the first type. The segments provided in the second sector  27  may be equipped with a surface of a second type. For example, the segments of the second sector  27  may be cylindrical segments. They may, as described by the applicant in German patent application DE 10 2007 035 528.0, also be formed with undercuts. A geometry with undercuts is shown in  FIG. 2  for the segments  26   a,    26   b,    26   c,    26   d,    26   e,    26   f,    26   g,    26   h,    26   j,    26   k,    26   l  of the second sector  27 . 
     In contrast the segments  24   a,    24   b,    24   c,    24   d,    24   e,    24   f ,  24   g,    24   h,    24   j,    24   k,    24   l,    24   m,    24   n,    24   o,    24   p,    24   q,    24   r,    24   s,    24   t ,  24   u,    24   v,    24   w  of the first sector  25  may have a different type of surface. For example, they may be elements having essentially planar reflecting surfaces. 
     The calculation of the shapes of the individual segments is carried out in extensive computer simulations. Each surface of each individual segment is individually calculated in order to be able to generate an overall optimized light distribution curve LV. 
     The description of the embodiments as shown in the drawings should be construed merely by way of example. They serve to clarify that major light portions impinging directly onto regions of the first sector  25 , coming from the light source  17 , are reflected from the sector  25  toward the exterior onto the building surface  13 . 
     The major portion of the light portions impinging onto the second sector  27 , coming from the illumination means  17 , should be reflected onto the sectors of the first sector  25 , and leave the light fixture from there only after further reflection. 
     Finally, a further embodiment of a reflector  16  of a light fixture  10  according to the invention will be explained as shown in the views of  FIGS. 9 to 11 : 
       FIG. 9  shows the interior of the reflector  16 , the illumination means not being illustrated for reasons of simplicity. It can be seen that the inner surface  30  of the reflector  16  is divided into a plurality of segments arrayed in a structured manner. The individual segments have individually calculated and configured surfaces. 
     As obvious from  FIGS. 9 and 10 , the inner surface  30  of the reflector, basically shaped rotation-symmetrical about the longitudinal center axis M, is divided into a plurality of angular spaced sectors A, B, C, D, E, F, G, H. The individual sectors have different light-technical functions. 
     Of particular importance is the fact that with the exception of the sector C, all sectors A, B, D, E, F, G, H have an equal or comparable light-technical function along their entire sector extending from the free outer edge R of the reflector  16  to the central apex S. 
     The sector C on the other hand, can be divided into a sector U 1  that is close to the outer edge, and into a sector U 2  that is close to the apex. Both sectors U 1  and U 2  have different light-technical functions. 
     In the reflector of  FIGS. 9 to 11  the sectors A, U 2 , E, F, G, and H are shaped to deflect those light portions, which are coming from the not illustrated illumination means  17  and impinging on the respective segment surfaces, directly onto the building surface not illustrated in  FIG. 10 , and to also ensure that a major portion of the respective light beams leave the reflector  16  directly, without any further reflection at the reflector  16 . 
     The sectors B, U 1 , and D, however, are formed as back-reflectors. This means that the light coming from the illumination means hitting the sectors B, U 1 , and D is initially reflected onto other sectors of the reflector and is then cast onto the building surface only after such further reflection. 
     The light beam paths illustrated by way of example in  FIG. 10  shows that those light portions impinging on one of the sectors B, U 1 , and D, are each reflected from there at a sector of the reflector that is positioned angularly opposite by exactly 180°, and leave the light fixture only after the second reflection. The back-reflection advantageously occurs along a straight line that which cuts the longitudinal center axis M of the reflector, or extends directly adjacent thereto. 
     Those segments in the sectors F and H are equipped with level, e.g. planar faces. As in  FIG. 2  some of the segments are denoted by reference symbols  224 , partially while adding lower case letters, and partially while adding one or more apostrophes. 
     Those segments in the sectors B, U 1 , and D, are denoted with the reference symbol  26  by way of example and in cohesion with the nomenclature in  FIG. 2 , partially while adding lower case letters and one or more apostrophes. 
     Those segments (such as segment  24   c ′″) in the sectors G, are embodied in a cylindrical manner, e.g. they have an essentially cylindrically arcuate surface. Segments in the sectors A, B, U 1 , U 2 , D, and E, also have cylindrically arcuate surfaces. 
       FIG. 10  shows that the sectors B, U 1 , and D mutually form a cohesive, back-reflecting second sector  27  in the sense of the present patent application. Likewise the segments of the sectors 
     F, G, and H form a reflecting sector  25  overall in the sense of the present patent application. 
     The second sector  27  consists of a plurality of sub-sectors B, U 1 , and D. The sector U 2  of the inner surface  30  of the reflector, however, is not part of a second sector in the sense of the present patent application, since light beams leave the reflector  16  from there after only one reflection. 
     The following describes the principle according to the invention in more detail as shown in the individual light arrows  50  to  56  of  FIG. 10 : 
     The light beam  50   a  impinging directly onto the sector U 2 , coming from the not illustrated illumination means, is reflected only once, and emitted out from the reflector  16  as the light beam  50   b.    
     The light beam  51   a  coming directly from the illumination means, which impinges onto the sector B, is initially reflected from there as the light beam  51   b,  and impinges onto a segment of the sector F. A further reflection occurs there such that the light beam leaves the reflector as a light arrow  51   c.    
     The light beam  52   a,  coming from the illumination means, directly impinges on the surface of a segment of the sector H, and is reflected from there directly out from the reflector  16  as the light beam  52   b.    
     According to the schematic view of  FIG. 10  the light beam  52   b  leaves the reflector in a direction toward the left bottom. It should be noted in this context that the directions of the arrows illustrating the light beams as indicated in the drawings are to be construed merely as schematic views. In fact, the surface of the segment being impinged by the light beam  52   a  will be oriented such that the light beam  52   b  leaves the reflector  16  of  FIG. 10  in a different direction, and extends particularly parallel, or approximately parallel to the light beam  51   c.    
     This also applies to all schematically illustrated light arrows, also for those arrows of  FIG. 11  illustrating the light beams. 
     The viewer of the drawings of the present patent application will understand that the light arrows illustrated are merely meant to clarify the light-technical function of the respective sector of the reflector surface, and should therefore not be construed as showing the exact direction thereof. 
     Coming from the light source, the light beam  53   a  impinged on a segment of the sector G, and is reflected out of the reflector as the light beam  53   b.    
     Coming from the illumination means, the light beam  54   a  impinges on a segment of the sector F, is reflected once, and leaves the reflector as the light beam  54   b.    
     Coming from the illumination means, a light beam  55   a  impinges on a sector GT of the second sector  27 , and is there reflected back onto a segment of the sector H as the light beam  55   b  due to a first reflection, and is there reflected out from the reflector as the light beam  55   c  after further reflection. 
     Coming from the light source, a light beam  56   a  impinges on a segment of the sector U 1 , and is there reflected back as the light beam  56   b  onto the sector G being positioned on the opposite side by 180°, and from there is reflected out from the reflector as the light beam  56   c  after further reflection. 
     The light beams of a sector indicated each clarify the light-technical behavior of the sector for all segments of the sector. 
       FIG. 10  shows that in case a light beam impinges on a segment of one of the sectors B, U 1 , or D due to a back-reflection, thus being reflected back on a segment that is positioned opposite by essentially 180°, relative to the longitudinal center axis, and from there is reflected out from the reflector after further reflection. 
     Finally, reference should be made to  FIG. 12 , showing a further embodiment of a light fixture  10  according to the invention in a view similar to that in  FIG. 1 , which is embodied as a spotlight, and is mounted fixedly on the floor  12 . The light fixture also serves for illumination of a side wall  13  analog to the view in  FIG. 1 . However, the light fixture  10  illustrated in  FIG. 12  is used to predominantly illuminate upper regions of the side wall. 
     For reasons of simplicity the reference symbols in  FIG. 1  have been utilized in  FIG. 12  for another embodiment. 
     For reasons of completeness it should be noted that the reflector  16  of the light fixture of  FIG. 12 , as shown in the position of  FIG. 1 , is mounted in a manner such that it can pivot about the longitudinal center axis M by 180°.