EP1632713A1 - Reflector for illuminating building areas - Google Patents

Abstract

A cup-shaped arcuate reflector (10) has inner surface that is subdivided into several curved segments (15a-15D), to partially reflect light emitted by lamp to the building surface.

Description

The invention relates first to a luminaire for illuminating building surfaces or building part surfaces, according to the preamble of claim 1.

Such a luminaire has long been developed by the Applicant and is sold under the trademark Parscan. The known lamp has a reflector element made of aluminum, which is formed substantially parabolic. The reflector element is made of an aluminum blank, which is pressed in rotation against a pin (male). It has after performing the pressing an inner side, which is formed as a die, and on which the male has imaged. The known reflector element has a plurality of segments which each comprise a substantially planar surface. Both when viewed in the circumferential direction and when viewed from an edge region of the reflector element toward its apex region, a row of adjacent segments in each case form a polygonal line.

Based on this prior art, the present invention seeks to further develop the known lamp such that a more homogeneous illumination of the building surface is possible.

The invention solves the problem with the features of claim 1, in particular with those of the characterizing part, and is accordingly characterized in that the segments each have a curved surface towards the interior.

The principle of the invention is thus essentially that, instead of using segments with substantially Plan surfaces that provide a reflection of the light emitted by the lamp outgoing light components in a conventional manner, now provide curved surfaces that fan out the individual light components or bundles targeted and thus can be uniform. In this way, it is possible to reduce the luminance on the reflector surface by distribution over a plurality of segments. In addition, a minimization of scattered light components is possible because the curved, in particular substantially spherically curved, segments can be particularly precisely predicted and correspondingly accurately formed.

While using substantially flat reflecting surfaces, reflection takes place according to the Euclidean law of reflection, according to which the light beam incident on this surface has a projection angle corresponding to the angle of incidence, when a parallel beam strikes a curved or curved surface, e.g. take place on a spherical surface, a divergent reflection. This has the consequence that the luminance of a single segment with a curved surface is lower than in a comparable segment with a substantially flat surface.

Overall, this leads to a homogeneously illuminated building surface or part of the building.

The luminaire according to the invention moreover allows a predeterminable radiation behavior of the luminaire by an appropriate choice of the radii of curvature of the surface of the segment. For this purpose, each segment is preferably curved twice, and thus has a first and a second radius of curvature. By choosing these two radii of curvature, the emission characteristics of the luminaire can be greatly influenced. Smaller radii lead to a larger fanning of a light beam and are therefore preferable to apply when the Lamp should be used as a floodlight, so a large area of a building part is to be illuminated. Larger radii of curvature fanned parallel beams of light less, and are therefore preferably used when the lamp is to be used as a spot light, and to illuminate a fairly narrow area, such as circular area, a building surface.

The formulation according to which light, starting from the lamp, at least partially reaches the surface of the building or the part of the building to be illuminated only after reflection or scattering on the inside of the reflector element, means that direct light components from the lamp can also directly reach the surface of the building to be illuminated. However, significant light components, that is to say the predominant portion of the luminous flux emitted by the lamp, initially strike the inside of the reflector element.

In particular, a building wall, a building ceiling or a building floor is referred to as the building surface or part of the building, and in the case of outdoor luminaires it is, of course, also possible to illuminate path areas or road areas. The luminaire according to the invention is fixed, preferably attached to a building surface or a building surface, but alternatively also to a mast or the like.

As a building surface or part of a building within the meaning of the present patent application, an object arranged on a building surface, eg a work of art, is also considered. The luminaire according to the invention for illuminating building surfaces or partial building areas can therefore also serve for object lighting, which is of interest in particular for luminaires designed as spot luminaires.

As a structured arrangement of the segments according to the preamble of claim 1, all such segments are understood, which are arranged, that are arranged according to a certain pattern or grid relative to each other. The segments can be arranged in any grid. However, such a grid is required to achieve the desired radiation characteristics of the lamp. Preferably, a grid is used, in which the segments are arranged substantially circular in the circumferential direction, wherein the number of segments of a circular ring as a function of the distance of the circular ring from a vertex area of the reflector element does not change but is constant. Consequently, there is also the possibility of arranging the segments as viewed in the direction from a region of the edge of the reflector element towards its vertex region essentially along a straight line, that is to say linearly.

According to an advantageous embodiment of the invention, a lamp in the region of a focal point of the reflector element can be arranged, that is placeable. This allows a precisely predeterminable Ausstrahlcharakteristik the luminaire. Finally, such a focal point near arrangement of a lamp is particularly advantageous if the reflector element is curved substantially parabolic. In addition to a parabolic shaped reflector element, other shell-shaped basic shapes for the reflector element may be considered. Of course, several lamps can be arranged within the reflector element. It is crucial that the light sources are arranged at least near the focal point.

In a further advantageous embodiment of the invention, the reflector element is formed substantially rotationally symmetrical. This allows a particularly simple design and manufacture of the reflector element and a particularly homogeneous illumination of the building surfaces.

According to a further advantageous embodiment of the invention, the surface is curved twice. In particular, the surface has a first curvature with a first radius and a second curvature with a second radius. The surface of each segment is thus substantially spherical. However, this is not necessarily the section of a spherical surface, but a domed in space surface, which is curved along two different radii of curvature. A Kugelaberfläche would be considered only as a special case, if the first radius and the second radius would be equal. This special case is covered by the invention.

By calculating and predetermining these two different radii of curvature, which preferably vary with the distance of the segment from the apex region of the reflector element, the emission characteristic of the luminaire can be determined very precisely beforehand. In particular, so that the building surface or building part surface can be illuminated in a particularly homogeneous.

Preferably, the first radius and / or the second radius are different depending on the distance of the segment to a peak region of the reflector element. This allows a particularly accurate predetermination of the radiation characteristics of the lamp.

According to a further advantageous embodiment of the invention, two segments are arranged immediately adjacent to each other. The entire inside of the reflector element is thus composed of the surfaces of the individual segments. This reduces the luminance on the reflector surface and minimizes the stray light components.

According to a further advantageous embodiment of the invention, a plurality of groups of annularly arranged segments are arranged between a vertex region of the reflector element and a light outlet opening of the reflector element. This allows a particularly homogeneous illumination of the building surface. In addition, the emission characteristics of the lamp in this way in a particularly simple manner can be determined beforehand.

According to a further advantageous embodiment of the invention, the segments are arranged substantially linearly relative to the curved inside of the reflector element. The segments are thus arranged substantially along a straight line when a viewer looks into the interior of the reflector element substantially along the axis of rotation of the reflector element or along its longitudinal central axis. In fact, since the inside of the reflector element itself is curved, the segments are arranged along a curved path which follows the course of the inside of the reflector element. This curved path connects the Scheüetbereich of the reflector element with the free edge region of the reflector element by the shortest route.

According to a further advantageous embodiment of the invention, the size of the segments increases from a vertex area of the reflector element to a light exit opening of the reflector element. This allows complete equipment of the inside of the reflector element with segments.

In this context, it should be noted that advantageously the entire inner surface of the reflector element is occupied by segments. The segments thus occupy the entire inner side of the reflector element from its free edge region up to the apex region, that is to say directly up to an opening through which the lamp or a base for the lamp is inserted. Further preferably, the number of segments in Circumferential direction independent of the distance of the segment of the apex region of the reflector element constant. This allows a particularly homogeneous illumination of the building surface or the building part surface.

According to a further advantageous embodiment of the invention, a collar is arranged in the region of an edge of the reflector element. This allows a particularly simple attachment of mounting holes.

The invention further relates to a luminaire for illuminating building surfaces or building part surfaces according to the preamble of claim 24.

This invention is also based on the above-described light of the applicant.

This invention has for its object to further develop the known lamp such that a simplified construction is possible.

The invention solves this problem with the features of claim 24, in particular with those of the characterizing part, and is accordingly characterized in that the segments each have a curved surface towards the interior, wherein the reflector element has a distance between its apex region and its free edge region, and a light exit opening, in particular a substantially circular light exit opening, having a first diameter, wherein the reflector element is exchangeable by a second reflector element with the same distance and with the same diameter, which has segments which have a different curved surface to the first reflector element.

The principle of this invention is therefore essentially to provide a first reflector element and a second reflector element with the same external dimensions or dimensions, ie with the same distance and with the same diameter. The first and the second reflector element are therefore interchangeable.

Consequently, there is also the possibility of using the same fastening elements or fastening openings, for example, on the first and the second reflector element. Attach mounting fixtures or mounting grooves. Both the first reflector element and the second reflector element can be attached to the same luminaire, preferably with the same fastening means.

However, the two reflector elements on differently curved surfaces, which differ in particular with respect to their radii of curvature. For example, may be provided on the first reflector element, a plurality of segments having larger radii, and be provided on the second reflector element, a plurality of segments having smaller radii. Accordingly, the first reflector element can produce a first emission characteristic for the luminaire, which corresponds for example to that of a conventional spotlight, and the second reflector element can provide a second emission characteristic different from the first emission characteristic, which corresponds to that of a conventional floodlight. By exchanging the reflector element, the emission characteristic of the luminaire can be completely changed in this way, without having to make any changes to the luminaire. It is sufficient to replace the reflector element. This is possible by calculating and providing only different radii of curvature for the curved surfaces.

The principle according to the invention offers the possibility of fundamentally simplifying the hitherto required complex construction of respectively different luminaires for different emission characteristics. Now only the reflector elements have to be individually different. The luminaire can otherwise be made completely identical with regard to its receiving space for the reflector element, with respect to the luminaire housing and with regard to the luminaire-side fastening elements for the reflector element. The storage of light parts can be simplified in this way fundamentally. Finally, the emission characteristics of an already built-in, that is permanently mounted on the job light, can be changed by replacing the reflector element if necessary.

It should be noted that it is also possible to use the same lamps with different reflector elements.

Fig. 1

in schematischer Untenansicht gemäß Ansichtspfeil I in Fig. 2 ein erstes Reflektorelement mit einer Vielzahl von Segmenten mit gewölbten Oberflächen,

Fig. 2

das Ausführungsbeispiel der Fig. 1 in teilgeschnittener Ansicht gemäß Schnittlinie II-II in Fig. 1,

Fig. 3

ein zweites Ausführungsbeispiel eines erfindungsgemäßen Reflektorelementes in einer Darstellung gemäß Fig. 1,

Fig. 4

das Ausführungsbeispieles der Fig. 3 in einer Darstellung gemäß Fig. 2, etwa entlang der Schnittlinie IV-IV in Fig. 3,

Fig. 5

in vergrößerter Darstellung einen Ausschnitt aus Figur 4, etwa gemäß dem Ausschnitts-Rechteck V, und

Fig. 6

in teilgeschnittener, vergrößerter Darstellung das Ausführungsbeispiel der Fig. 4 etwa entlang der Schnittlinie VI-VI in Fig. 4.

Further advantages of the invention will become apparent from the non-cited subclaims and from the following description of two embodiments shown in the figures. Show:

Fig. 1

2 shows, in a schematic bottom view according to arrow I in FIG. 2, a first reflector element with a multiplicity of segments with curved surfaces,

Fig. 2

1 in a partially sectioned view along section line II-II in Fig. 1,

Fig. 3

A second embodiment of a reflector element according to the invention in a representation according to FIG. 1,

Fig. 4

3 in a representation according to FIG. 2, approximately along the section line IV-IV in FIG. 3, FIG.

Fig. 5

in an enlarged view a section of Figure 4, approximately according to the cut-out rectangle V, and

Fig. 6

in a partially sectioned, enlarged view of the embodiment of FIG. 4 approximately along the section line VI-VI in Fig. 4th

The reflector element is designated in its entirety in the figures by 10, wherein for the same parts or elements of the two different embodiments of Figures 1 and 2 on the one hand and Figures 3 to 6 on the other hand, for simplicity, the same reference numerals, partially with the addition of small letters are used.

FIGS. 1 and 2 show a substantially parabolically curved reflector element 10 which has a vertex region 11 and a free edge region 12. The axial distance between the apex region 11 and the free edge region 12, that is, the height or peak height of the reflector element 10, is designated h ₁ in FIG. 2. The free edge region 12 of the reflector element surrounds a substantially circular light exit opening 20 of the diameter d ₁ . This thus corresponds to the inner diameter d _{1 of} the reflector element 10 at its widest point.

In the region of the free edge 12, the reflector element 10 is expanded radially outwards and has a flange-like collar 13. On the flange-like collar 13, as best seen in FIG. 1, two groove-like edge recesses 14a, 14b are arranged, which constitute fastening openings. By means not shown fastening means, such as screws, which partially pass through these edge recesses 14 a, 14 b, the reflector element on a not shown luminaire housing a light, also not shown are attached. The reflector element 10 is arranged for this purpose in a conventional manner in an interior of the lamp. In the assembled state of the luminaire, the upper side 30 of the flange-like collar 13 with respect to FIG. 2 typically bears against a luminaire housing-side contact surface, so that the flange-like collar 13, and thus the entire reflector element 10, can be clamped against this contact surface.

Alternatively, of course, other types of attachment are possible.

In the region of the vertex 11 of the reflector element 10 there is an opening, not shown in the figures, which is typically mounted in the form of an opening about the longitudinal central axis I of the reflector element 10 in the region of the vertex 11 thereof. The opening can be achieved, for example, by punching out or cutting out the apex area 11. Through this opening, not shown, a lamp is pushed through, so that the lamp 10 is in the mounted state in the interior 21 of the reflector element 10, preferably approximately in the region of the sketched in Fig. 2 only sketched focal point 22.

The reflector element 10 has on its inside 27 a plurality of segments. In Fig. 1 circumferentially adjacent to each other arranged segments by way of example denoted by the reference numerals 15a, 15b, 15c, 15d, it being clear that in the circumferential direction a total of eighty segments are provided, each forming an annular group.

The segments extend from the free edge region 12 of the reflector element 10 all the way to the region of the vertex 11. As can be seen in particular from FIG. 1, the segments are along arranged by straight lines 18. In total, there are, according to the number of segments in the circumferential direction, eighty different rays arranged in a straight line 18, which, viewed in the direction of Fig. 1 from the apex 11 of the reflector element 10 toward its free edge 12 extend. This results in a spider-web-like structure or a spider-web-like grid.

The segments 15a, 16a and 17a, which are arranged along the straight line 18a, are shown by way of example in FIG. Altogether, along this straight line 18a, twenty segments extend from the apex region 11 of the reflector element 10 towards its free edge region 12. It should be noted that the lines 18, 18a represent straight lines only when viewed in FIG. In fact, the lines 18, 18a follow the parabolic basic shape of the reflector element 10, which results particularly from FIG. 2. However, the line 18 connects the free edge region 12 of the reflector element 10 to the apex region 11 in the shortest path.

Fig. 1 makes it clear that the reflector element 10 has a total of a concentric arrangement of annular groups of segments. Thus, a group of eighty segments immediately adjacent the free edge 12 of the reflector element 10 forms an annular group 29a of segments. Located radially within this group 29a, and closer to the apex 11 of the reflector element 10, there is a second circular ring-like group 29b of segments. Again radially further inward and closer to the apex 11, there is a third annular group 29c of segments. In total, according to the number of segments along a straight line 18, there are twenty different annular groups 29 of segments. Each group of segments has eighty segments.

Each group 29a, 29b, 29c of segments is arranged along a circular line 28a, 28b, 28c. All circular lines 28, 28a, 28b, 28c are concentric circular lines.

The entire inner side 27 of the reflector element 10 is occupied by segments (e.g., 15a, 15b, 15c, 15d, 16a, 17a). The inside of the reflector element 10 is thus composed completely of the individual curved surfaces 31a, 31b, 31c, 31d of the individual segments. Each segment thus has its own surface.

Figures 3 and 4 show another embodiment of the reflector element 10 according to the invention, which does not differ in terms of the number of segments. Again, there are eighty in the circumferential direction and twenty along a straight line. The reflector element 10 according to Figures 3 and 4 has a height h ₂ , which is identical to the height h _{1 of} the first embodiment. Also, the inner diameter d _{2 of} the light exit opening 20 of the reflector element 10 is identical to the inner diameter d _{1 of} the first embodiment. Finally, the outer diameter a _{2 of} the reflector element 10 according to Figures 3 and 4 is identical to the outer diameter a _{1 of} the first embodiment. The same applies to the fastening receptacles 14a, 14b.

The decisive difference between the reflector element 10 of FIGS. 1 and 2 and the reflector element 10 of FIGS. 3 and 4 is that the individual segments have differently curved surfaces. For a better explanation, reference is made to FIGS. 5 and 6:

FIG. 5 shows an enlarged detail from FIG. 4, which is arranged somewhere between the free edge region 12 and the vertex 11. In accordance to the Numbering of the segments 15a, 15b, 15c, 15d of the outermost annular group 29a of segments are shown in FIG. 5 by way of example in a sectional representation of the segments 23a, 24a, 25a, 26a. In accordance with the above-mentioned designation of the annular groups 29, Fig. 5 shows in section the annular groups 29i, 29j, 29k, 29I, 29m, 29n, 29o of segments.

While FIG. 5 essentially shows a vertical section, FIG. 6 shows a horizontal section through the reflector element 10. In sectional representation, the circular-ring-like group 29e of segments is shown here. In view, one recognizes the circular ring-like groups 29f, 29g, 29h, 29i of segments as well as further annular groups.

By way of example, it should be clarified on the basis of the segment 32 that each segment has an essentially trapezoidal basic shape. While the two opposite sides 33a and 33b, which limit the segment 33 in the circumferential direction, are formed substantially the same length, the radially inner, ie the apex 11 facing side 34 of the segment 32 is shorter than the free edge region 12 facing side 35th this segment 32, so that there is a trapezoidal basic shape. It should be noted that this trapezoidal basic shape, of course, results only when viewing this segment 32 in plan view. The actual trapezoidal shape results only when the surface 36 of the segment 32 is projected onto a plane. Also in this consideration, the trapezoidal shape is only approximate to understand because, depending on the way in which the surface 36 of the segment 32 is curved, the projected area does not necessarily have to have straight edges.

The surface 36 is curved twice. In order to clarify the two curvatures, reference is made on the one hand to FIG. 5, showing a first radius of curvature r ₁ , and on the other hand on Fig. 6, which indicates a second radius of curvature r ₂ .

FIG. 6 shows a radius of curvature r ₂ in the section 29e of segments shown in section. Likewise, the surfaces 31a, 31b, 31c, 31d of the associated segments 19a, 19b, 19c, 19d are curved by a corresponding radius of curvature r ₂ , whereby this can not be represented graphically. The term r ₂ 'indicates that it is a second radius of curvature r ₂ , which describes a curvature of the surface of the segment, if one intersects the segment in the longitudinal direction, ie substantially transversely to the straight line laterally delimiting the segment 18.

Although the radius of curvature r ₂ 'associated with the surfaces 31a, 31b, 31c, 31d of the segments 19a, 19b, 19c, 19d is indicated in FIG. 6, it is apparent from these figures that these segments 19a, 19b, 19c, 19d in FIG View and not shown in section, but not clearly recognizable.

It should be noted that the second radius of curvature r _{2 of} the group 29e of segments is preferably different from the radius of curvature r ₂ 'of the group 29g of segments 19a, 19b, 19c, 19d.

Significantly, all segments of group 29e of segments have a radius of curvature r ₂ that is constant. This radius of curvature r ₂ defines a curvature of an associated surface 37 of a segment 38 about a curvature axis, not shown, which runs essentially parallel to the longitudinal central axis I of the reflector element 10.

Also, the segment 32, which is closer to the apex 11 of the reflector element 10 toward than the last considered segment 38 has a curvature about a radius r ₂ , which corresponds to a curvature about a curvature axis, which may define a plane together with the longitudinal central axis I of the reflector element, which may represent a sectional plane for the reflector element, along which the reflector element in two in the Substantially identical halves can be cut by a longitudinal section approximately according to FIG. 4. Thus, the family of curvature axes includes those straight lines which intersect the central longitudinal axis or rotation axis I of the reflector element 10, the point of intersection being located above the apex area 11 of the reflector element 10 with respect to FIG.

The radius r _{2 of} the group 29i of segments may be different from the radius r _{2 of} the group 29e of segments. It is advantageous if different groups 29a, 29b, 29c, 29e, 29f, 29g, 29h, 29i, 29j, 29k, 291, 29m, 29n, 29o have different radii r ₂ , the different segments each of a group, eg the group 29e, have identical radii r ₂ . The radius r ₂ can change with the distance of the group 29 of segments from the vertex 11, for example increase continuously.

Each surface of each segment is also curved along a further radius r ₁ . This curvature will be illustrated with reference to FIG. 5.

Thus, for example, the surface 40 of the segment 26a is curved in a radius r ₁ about an axis of curvature 39 which is indicated only schematically. This curvature axis 39 is aligned substantially perpendicular to the longitudinal central axis I of the reflector element 10. Advantageously, segments of a group, eg, group 291, are each curved with the same radius r ₁ . The individual segments of a group, for example, the group 29l, are of course curved around different axes of curvature 39, the crowd of the Curvature axes 39 of a group 291 of segments are all in a common plane. The longitudinal axis I represents the normal vector to this plane.

From Fig. 5 it follows that the segments 23a, 24a, 25a, 26a, respectively have surfaces with a corresponding radius of curvature r ₁ . However, the individual radii of curvature r _{1 of} the different groups 29j, 29k, 29l, etc. of segments are different.

From the overall consideration of Figures 5 and 6 it is clear that both the first radius of curvature r ₁ and the second radius of curvature r ₂ vary depending on the distance of the corresponding segment to the apex region 11 of the reflector element 10, within a circular ring-like group 29 of segments, however, constant are.

From the above description of the exemplary embodiments, it is clear that a first exemplary embodiment of a reflector element 10 according to FIGS. 1 to 3 can have, for example, 1600 segments, each segment having a surface which is curved along two different radii r ₁ and r ₂ . The second exemplary embodiment of a reflector element 10 according to FIGS. 3 to 6 has a corresponding number and arrangement of segments, but the individual segments have differently curved surfaces of the segments with different radii r ₁ , r ₂ compared to the exemplary embodiment of FIGS. By selecting the radii r ₁ and r _{2 of} the different segments, the radiation behavior of the luminaire can be determined. Different radiation characteristics of the luminaires result only from the change of the radii r ₁ and r ₂ .

As can be seen from the comparison of Figures 1 and 3, the mounting grooves 14a, 14b are completely identical in the two different reflector elements. On the same luminaire housing can therefore be interchangeable with the same fasteners either the first embodiment of a reflector element according to FIG. 1 or alternatively the second embodiment of a reflector element 10 shown in FIG. 3, without special conversion measures are required.

It should be noted that beam angles in the range of 5 to 15 degrees are typically used for beam angles of a luminaire to be used as a spotlight and beam angles in the range of 50 to 70 degrees are used for flood applications. Of course, also intermediate beam angle can be achieved, with the reflector element according to the invention also fine gradations or graduations are possible.

Of course, the number of segments (eighty in the circumferential direction, twenty in the radial direction) set to 1600 in the embodiment is arbitrary. However, it is also conceivable that two interchangeable reflector elements with respect to their external dimensions such as height (h ₁ , h ₂ ), outer diameter (a ₁ , a ₂ ) and diameter (d ₁ , d ₂ ) are identical, but in terms of their number of segments differently.

For a better understanding, it should also be noted that primarily smaller radii r ₁ , r ₂ are used to achieve a flood effect, ie to achieve the greatest possible beam angle. To achieve a spot effect, substantially larger radii r ₁ , r ₂ are used.

The reflector element 10 is preferably made of pressed aluminum. For this purpose, an aluminum blank, ie a circular disk, is moved along a rotating pin, so that the pin (male) is imaged on the aluminum blank. As can be seen in particular from the sectional view according to FIG. 5, the inner side 27 of the reflector element 10 is completely free of undercuts. The reflector element 10 can therefore be easily removed from the male part due to a linear movement. When using pressed aluminum as a material for the reflector element, the inside 27 is mirrored, so that special measures are unnecessary.

Alternatively, however, the reflector element can also be formed, for example, by a plastic injection-molded part or a glass body element, which is provided with a reflective surface which, for example, is vapor-deposited.

Claims (24)

Luminaire for illuminating building surfaces or building part surfaces, comprising a substantially cup-shaped arched reflector element (10), in the interior (21) at least one lamp can be arranged, starting from the light at least partially only after reflection or scattering on the inside (27) of the reflector element to the illuminated building surface or the building part surface, wherein the inside of the reflector element in a plurality of structured arranged segments (15a, 15b, 15c, 15d, 32, 38) is divided, characterized in that the segments each have a curved surface towards the interior (31a, 31b, 31c, 36, 37, 40). Luminaire according to claim 1, characterized in that a lamp in the region of a focal point (22) of the reflector element (10) can be arranged. Luminaire according to claim 1 or 2, characterized in that the reflector element (10) is substantially rotationally symmetrical (rotation axis I) is formed. Luminaire according to one of the preceding claims, characterized in that the reflector element (10) is curved substantially parabolically Luminaire according to one of the preceding claims, characterized in that the surface (31a, 31b, 31c, 36, 37, 40) is curved twice, and in particular a first curvature (Fig. 5) having a first radius (r ₁ ) and a second curvature (Fig. 6) having a second radius (r ₂ ). Luminaire according to claim 5, characterized in that the second curvature takes place with a second radius (r ₂ ) about a curvature axis which is aligned substantially parallel to a longitudinal central axis (I) of the reflector element (10) or intersects it at an acute angle. Luminaire according to claim 5 or 6, characterized in that the first curvature takes place with a first radius (r ₁ ) about a curvature axis which is aligned substantially perpendicular to a longitudinal central axis (I) of the reflector element. Luminaire according to one of claims 5 to 7, characterized in that the first and the second radius (r ₁ , r ₂ ) is different. Luminaire according to one of claims 5 to 8, characterized in that the first radius (r ₁ ) and / or the second radius (r ₂ ) in dependence on the distance of the segment to a vertex area (11) of the reflector element (10) is different. Luminaire according to one of claims 5 to 9, characterized in that the first radius (r ₁ ) and / or the second radius (r ₂ ) increase with increasing distance of the segment to a vertex area (11) of the reflector element (10). Luminaire according to one of the preceding claims, characterized in that in each case two segments (15a, 15b, 15c, 15d, 16a, 17a) are arranged directly adjacent to each other. Luminaire according to one of the preceding claims, characterized in that a plurality of segments (15a, 15b, 15c, 15d) along the circumference of the reflector element (10) are arranged substantially annular. Luminaire according to claim 12, characterized in that between a vertex area (11) of the reflector element and a light exit opening (20) of the reflector element a plurality of groups (29, 29a, 29b, 29c, 29d, 29e, 29f, 29g, 29h, 29i, 29j, 29k, 291, 29m, 29n, 29o) arranged in a circular ring segments are arranged. Luminaire according to one of claims 12 to 13, characterized in that the number of segments in the circumferential direction is independent of the distance to a vertex area (11) of the reflector element (10) is constant. Luminaire according to one of the preceding claims, characterized in that the segments, relative to the curved inner side (27) of the reflector element (10), are arranged substantially linearly. Luminaire according to one of the preceding claims, characterized in that the size of the segments of a vertex area (11) of the reflector element (10) towards a light exit opening (20) of the reflector element increases. Luminaire according to one of the preceding claims, characterized in that each segment has a substantially trapezoidal base surface (projected surface). Luminaire according to one of the preceding claims, characterized in that an annular edge region (12) of the reflector element (10) defines a substantially circular disk-shaped light exit opening (20). Luminaire according to one of the preceding claims, characterized in that the lamp is arranged stationary. Luminaire according to one of the preceding claims, characterized in that the inner side (27) of the reflector element between the light exit opening (20) and the apex region (11) is completely occupied by segments. Luminaire according to one of the preceding claims, characterized in that in the region of an edge (12) of the reflector element, a collar (13) is arranged. Luminaire according to one of the preceding claims, characterized in that on the reflector element (10), in particular on the collar, fastening elements and / or fastening openings, in particular fastening grooves (14a, 14b) or fastening receptacles, are arranged. Luminaire according to one of the preceding claims, characterized in that in the region of an apex region (11) of the reflector element, an opening is provided, which is durchgreifbar by a lamp or by a mounting base for the lamp. Luminaire for illuminating building surfaces or building part surfaces, comprising a substantially bowl-like arched reflector element (10), on the inside of a plurality of segments (15a, 15b, 15c, 15d, 32, 38) is arranged, characterized in that the segments each have a to the interior of arched surface (31a, 31b, 31c, 36, 37, 40), wherein the reflector element has a distance (h ₁ ) between its apex region (11) and its free edge region (12), and a light exit opening, in particular a substantially circular light exit opening (20), with a first diameter (d ₁ ), wherein the reflector element (FIG. 2) is separated by a second reflector element (FIG. 4) with the same distance (h ₂ ) and with the same diameter (d ₂ ) is interchangeable, which has segments that have a different curved surface to the first reflector element.

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