EP2020563B1 - Lighting device - Google Patents

Description

The invention relates to a luminaire, comprising a cup-shaped, a bottom surface having housing, are mounted on the light source and associated electrical components and in which a luminous body engages positively and is releasably secured to the housing.

Luminaires of this type are known and are used both indoors and outdoors.

From the US 2003/201704 A1 is a lamp preferably provided with a screw in the form of a lamp known, which has a halogen lamp as the light source, which is arranged behind a simultaneously serving as explosion protection lens in the housing portion of the lamp. The lens is held in a ring member, which also serves for fixing a preferably consisting of glass filament whose inner wall is provided with a reflective coating. The light generated by the halogen lamp is directed directly and also via a reflector located at the back to the halogen lamp against the reflective inner coating of the filament and also to the translucent end wall of the filament, so that the entire light generated by the halogen lamp at the front of the filament and not in the side Area exits.

From the DE 36 33 976 A1 is a side glare-limited light with a pulled-down mirror reflector known, the lower edge of the mirror reflector has a light scattering body. The light scattering body, which is a prism or a reflection surface, is disposed immediately adjacent to the ceiling structure within which the mirror reflector is located, at the base of which the lighting means, in particular a lamp or light bulb, is positioned.

From the U.S. Patent 5,173,810 a light-transmitting lens for use with a photoelectric sensor is known, wherein in a substantially hemispherical, in particular made of black plastic housing, a specially designed lens is provided, which makes it possible to redirect the light emitted from an LED arranged in the housing bottom side so that From the front of the housing emerges a bundle of parallel light rays and accordingly the entire light generated by the LED can be used.

From the WO 01/59365 A is a lamp with a lamp and at least one - viewed in the emission direction - behind or behind the lamp arranged concave reflector known, being arranged laterally of the lamp color filter of the kind that only that of the lamp laterally against the at least one concave Reflector emitted light is changed by the color filter in its color composition, while the radiated by the lamp in the emission direction light is not changed by the color filter. As the light source while a rod-shaped gas discharge lamp is used, which is arranged centrally between the side color filters and before the Raumabstrahlrichtung a Lichtverteil element in the form of consisting of side reflectors and cross louvres grid is arranged on the majority of the light emitted by the lamp after is radiated down. Alternatively, instead of a grid and a perforated plate or other optical element in the form of a diffuser or a Prism structure can be used. In all embodiments, the area surrounding the lamp appears in a different color, so that different effects and moods can be generated by choosing a suitable filter.

Object of the present invention is to make lights of the type mentioned while creating a distinctive aesthetic appearance constructively simple, universally applicable and in lighting terms such that on the one hand large-area glare-free direct light and on the other hand at least one radial indirect light component is obtained.

This problem is solved by the interaction of the features of patent claim 1.

Due to the special shape of the luminous element and the targeted positioning of the bulbs, it is possible to uniformly apply direct light to the essentially flat front surface and to configure the luminance differences between the front surface and the inclined surface in such a way that between the inclined surface and the housing an indirect light-emitting radial light region is produced which, due to the lower luminance, has an inclined surface emphasized and differentiated from the direct light-supplying front surface.

The radial light section is obtained by virtue of the fact that the base region of the luminous element has a fixing section engaging in the cup-shaped housing and a transparent, direct-light-applied section located between the fastening section and the oblique surface.

It is important for the lighting function of the luminaire according to the invention that the receiving area for the luminous means or the luminous means is located below the cross-sectional plane of the luminous element corresponding to the beginning of the oblique surface and preferably below the translucent section preceding the beginning of the oblique surface, since this is an important Condition for the characteristic loading of the different areas of the filament with direct light or grazing light is.

According to an advantageous embodiment of the invention, the axial height of the radial light portion is smaller than the axial height of extending to the front surface inclined surface portion, wherein the axial height of the radial light portion is in preferred embodiments about 30% to 60% of the height of the inclined surface portion. In this case, the inclined surface with the bottom surface of the housing preferably includes an angle of less than 50 °, and this angle is in advantageous embodiments in the range of about 25 ° to 45 °.

Conveniently, the transition between the attachment portion and the translucent, the radial light-supplying portion is designed in the form of a connected with a diameter increase, in particular rectangular step.

In this way it can be achieved that the luminous body and the housing engage flush with each other, so that the radial light section is optically clearly delimited, on the one hand by the housing and on the other hand by the inclined surface located only in the grazing light region.

According to an advantageous embodiment of the invention, a disc-shaped element, in particular an annular disc is positioned in particular in a circular lamp in the region of the radial light portion and with respect to the inclined surface with predeterminable axial distance, which extends at least substantially parallel to the front surface and whose diameter is greater than the diameter of the front surface ,

Since this annular disc is located in the radial light range, a recessed with respect to the front surface luminous surface is created at a distance from the fully illuminated front surface, both aesthetically to a particularly characteristic appearance of the lamp leads as well as in terms of lighting technology, a desirable additional benefits, which is especially evident when the radially inner portion of the annular disc is formed as at least partially open, translucent area and thus the back of the disc location mounting surface for the lamp can be illuminated.

The annular disc is preferably connectable via coupling elements with the housing, so that they can be attached at any time to the basic version of the lamp if necessary. Likewise, it is possible to form the annular disc as a top wall of an annular space at least partially surrounding the housing, wherein the annular space thus formed for receiving functional components, such. a ballast or a motion detector can be used.

A particularly preferred embodiment of the invention is characterized by an embodiment in the form of a ceiling or flush wall recessed luminaire with a reflector pot which surrounds the filament on all sides with a radial distance and the opening plane extends at least substantially corresponding to the plane of the front surface of the filament.

In this case, the reflector pot either on a predeterminable angle or approximately parallel to the inclined surface of the filament extending bottom surface, which merges in the height range of the inclined surface in a vertical wall section, or he has a located in the housing bottom, radially outwardly extending and within the vertical Projection of the front surface ending base surface, which is followed by a sloping wall region, which in turn merges into a vertical wall section. The oblique wall region of the reflector pot can be a function of the desired visible luminance distribution steeper or less steep than the oblique surface of the filament are selected.

In these embodiments of the invention, the radial light portion is deflected through the reflector pot in such a way that the light emitting surface of the filament increases by characteristic diffused diffused light and by the different luminances in the field of the filament and in the reflector cup increased aesthetic differentiation for use as General lighting without special Entblendungsansprüche is obtained.

Of particular advantage is further that due to reflections and scattering effects by the interaction of inclined surfaces of the filament and opposite Reflektortopfwandungen any shading effects in the bottom region of the reflector pot avoided and the reflector pot over the entire surface, i. is illuminated in its bottom area, which is not only photometrically advantageous, but also significantly improves the aesthetic overall impression of the lamp.

A particularly advantageous in terms of achievable light output embodiment of the invention, which can be used both in the case of round lights as well as in the case of rectangular lights, is characterized in that the filament is not integrally formed, but consists of several, in particular glued or welded together parts in which at least the front surface comprises a layer structure with a microprism disk whose outer prisms are covered by a preferably crystal-clear outer surface and on whose inner side a diffuser film is preferably provided. This layer structure forming the front surface expediently becomes directly or via a frame enclosing the layer structure positively connected to a matched end portion of the filament, and both parts are welded together in particular. The adjoining the front surface, preferably formed by the end portion of the filament region of the filament is formed as a circumferential luminous surface.

The use of the layer structure mentioned leads in comparison to an embodiment in opal glass or a corresponding plastic material to a substantial, for example, up to 50% increase in the light output.

Both in the case of a round and a rectangular configuration of the lamp can be used as a light bulbs in particular ring or rod-shaped fluorescent lamps or compact fluorescent lamps with a plurality of light rods.

Likewise, the LED lighting technology can be used in an energy-efficient manner by attaching a plurality of LEDs to at least one preferably reflective support surface and positioning the support surface in the housing-side region of the radial light section of the luminous element. The particular desired light color can be ensured by using commercially available LED's, with appropriate equipment also RGB illumination is possible.

Preferably, the luminous element with the housing via a plurality of mounted on the housing toggle lever buckles can be coupled. These toggle clamps not only allow a simple and when using a seal between the light and body and absolutely tight connection between the two bodies, but they also have the advantage that they are easily operable when the lamp from a reflector pot is surrounded, because these latches are accessible for operation via the gap between the luminous element and reflector pot.

According to a further embodiment of the invention, which is characterized by maintaining a particularly high luminance achievable in the region of the front surface of the luminaire while maintaining all the other advantages of the basic concept according to the invention, the plurality of luminous means are mutually spaced apart in a plane parallel to the front surface of the luminous element arranged LEDs is provided, each LED is associated with a special intent optics, which causes both an axial bundling and a lateral emission of light, the LED's with associated attachment optics are preferably positioned in the base region or at least partially in the base region of the filament.

The number and distribution of the LED's with associated attachment optics is chosen so that the obtained by the intent optics axially directed light beam illuminate the entire surface of the front surface, i. essentially adjacent to one another or overlapping on the front surface in their edge regions. The direct light emerging laterally out of the respective optical attachment at least predominantly strikes the radial light section of the luminaire, so that, in accordance with the basic principle of the invention, the radial light section and the front surface are in turn subjected to direct light.

Fig. 1

eine schematische Schnittansicht einer Grund-Ausführungsform einer Leuchte gemäß der Erfindung,

Fig. 2

eine Schnittansicht einer Variante der Leuchte nach Fig. 1,

Fig. 3

eine perspektivische Schnittansicht einer weiteren Ausgestaltung der erfindungsgemäßen Leuchte,

Fig. 4

eine schematische Schnittansicht einer als Einbauleuchte gestalteten Ausführungsform der Erfindung,

Fig. 5

eine perspektivische Ansicht einer Ausführungsform in Einbauversion mit Kompakt-Leuchtstofflampen, wobei die Leuchte Rechteckform besitzt,

Fig. 6

eine perspektivische Schrägansicht einer Rechteckleuchte in Form einer Einbauvariante,

Fig. 7

eine perspektivische Teilschnittansicht der Rechteckleuchte nach Fig. 6, und

Fig. 8

eine Teilschnittansicht einer weiteren Ausführungsform einer erfindungsgemäßen Leuchte mit einer Mehrzahl von mit einer Zusatzoptik zusammenwirkenden LED's.

The invention will now be described by way of example with reference to the drawings; in the drawings shows:

Fig. 1

a schematic sectional view of a basic embodiment of a lamp according to the invention,

Fig. 2

a sectional view of a variant of the light according to Fig. 1 .

Fig. 3

a perspective sectional view of another embodiment of the lamp according to the invention,

Fig. 4

a schematic sectional view of a designed as a recessed light embodiment of the invention,

Fig. 5

a perspective view of an embodiment in built-in version with compact fluorescent lamps, the lamp has a rectangular shape,

Fig. 6

a perspective oblique view of a rectangular lamp in the form of a built-in variant,

Fig. 7

a perspective partial sectional view of the rectangular lamp after Fig. 6 , and

Fig. 8

a partial sectional view of another embodiment of a lamp according to the invention with a plurality of cooperating with an additional lens LED's.

Fig. 1 shows the basic structure of a luminaire according to the invention, which comprises an existing particular satin-finished opal glass or a corresponding plastic luminous body 2 and an associated cup-shaped housing 1.

The luminous element 2 is formed by a base part designated by the general reference numeral 3 and an outer region 4, wherein the Exterior 4 consists of an inclined surface region 5 and a front surface 6. The transition between the inclined surface region 5 and substantially flat or only slightly outwardly curved front surface 6 takes place in the illustrated example over a curved region, wherein the front surface 6 and inclined surface 5 at an acute angle to each other.

Instead of in Fig. 1 shown transition between the inclined surface region 5 and front surface 6 may be provided as a transition region between an inclined surface region 5 and front surface 6 cylindrical region of predetermined height, which is acted in contrast to the inclined surface region 5 not with grazing light, but especially with direct light from the bulbs.

Towards the housing side, a radial light section 9, which merges via a transition stage 10 into a fastening section 8, which engages into the housing 1 and can be fixed to the housing 1, follows on the inclined surface region 5 of the luminous element 2.

The one or more bulbs 7 are designed and / or positioned so that both the base region 3 and the radial light portion 9 and the front surface 6 are substantially fully exposed to direct light and the inclined surface 5 of the filament 2 is located substantially only in the grazing light range.

An essential feature of the invention is to be seen in that the respectively used light sources 7 are positioned at least below a plane which extends as an imaginary transverse plane through the beginning of the widening inclined surface region 5.

In the example of a round luminaire, which is not limited in terms of shaping, a fluorescent lamp FC is used as the luminous means 7, but depending on the dimensioning of the luminaire, two or more fluorescent lamps and also planar LED arrangements can be used instead of one fluorescent lamp, preferably in the same plane are located.

The transition stage 10 between radial light section 9 and attachment section 10 of the existing opal glass or a suitable plastic material filament is selected and dimensioned so that the housing 1 is flush with the radial light portion 9, whereby a defined optical boundary of the radial light portion 9 and a positive integration of the housing 1 in the overall structure of the lamp is obtained.

In functional terms, the radial light section 9, which is directly exposed to light, provides a defined proportion of indirect light on the room side, which, depending on the installation situation, appears in addition to the direct light supplied by the front surface. The oblique surface 5, which is located over its full extent in the grazing light range of the light source 7, occurs in subordinate terms in terms of lighting technology, but contributes to the clear differentiation between direct light and indirect light.

The axial height of the radial light section 9 is preferably smaller than the axial height of the inclined surface section extending up to the front surface 6, and in particular is approximately 30 to 80% of the height of the inclined surface section.

With the bottom surface of the housing 1, the inclined surface 5 includes an angle smaller than 50 °, and this angle is preferably in particular in the range of 25 ° to 45 °.

The sectional view after Fig. 2 shows the embodiment according to Fig. 1 supplemented by an annular disc 11 coupled to the housing 1, which is positioned at the level of the transitional stage 10 and has a diameter which is significantly greater than the outer diameter of the front surface 6. Depending on which axial height for the radial light section 9 in the respective embodiment a lamp is selected according to the invention, the annular disc 11 is a more or less high, but in comparison to the front surface 6 always lower luminance, so that the overall flat character of the light even more emphasized and it is possible by creating a kind of backlight the front surface 6 to make even more apparent. This is for example advantageous if the front surface has a special marking, such as a house number representation.

It is expedient in this embodiment, when the radially inner support portion 24 of the annular disc 11 is formed as at least partially open and translucent area, since in this case an additional illumination of serving for fastening the lamp wall area on reflection and scattered light is achieved.

Fig. 3 shows a development of the light after Fig. 2 , In this case, the annular disc 11 is formed as a top wall of the housing 1 at least partially enclosing annular space 13. The elements required to create the annular space are preferably plastic mold elements which are connected in a simple manner to corresponding coupling walls of the annular disk 11 can. The annular space created in this way is preferably used to hold functional elements, such as a ballast or a motion detector. A ballast 34 may also be attached to the bottom of the housing 1.

Fig. 4 shows a particularly advantageous embodiment of the invention in the form of a ceiling or flush wall recessed luminaire with a reflector pot 14 which surrounds the filament 2 on all sides with a radial distance and whose opening plane 15 extends at least substantially corresponding to the plane of the front surface 6 of the filament 2. The reflector pot 14 has an approximately parallel to the oblique surface 5 of the filament 2 extending or steeper bottom surface 16, which merges in the height range of the inclined surface 5 in a vertical wall portion 33. Both the bottom surface 16 and the vertical wall portion 33 are uniformly exposed to light via scattering and reflection effects, so that within the reflector pot 14 no shading effects occur.

At one opposite the in Fig. 4 modified embodiment shown, from Fig. 7 apparent variant of the invention, the reflector pot 14 has a located in the region of the housing bottom, outwardly extending and radially within the vertical projection of the front surface 6 ending base surface 22, to which a slanted wall portion 23 connects, which merges into a vertical wall portion 33. In this case, the angle between the housing bottom and the inclined wall region is preferably greater than the angle between the housing bottom and the inclined surface of the luminous element opposite the inclined wall region. As a result of this configuration, due to the resulting utilization of reflection effects, it is possible for the entire reflector pot, including its base surface 22, to be uniformly exposed to light and thereby present in the interior of the reflector pot 24 no disturbing the aesthetic appearance darker or shaded areas.

In the described embodiments of ceiling or wall-mounted recessed luminaires can be provided as a light source on a support surface 18 groups of LEDs, wherein the particular reflective executed support surface 18 is positioned in the housing-side region of the radial light portion 9 of the filament 2. The support surface 18 may be mounted on a functional component, in particular a voltage converter.

Due to the deflecting of the radial light portion over the reflector pot 14 towards the opening side of the luminaire and also through the diffuser light components becoming effective in the reflector pot, an aesthetically high-quality appearance of the recessed luminaire is achieved. Due to the different luminances between the front surface 6, which is exposed to a high proportion of direct light, and the pot region surrounding the front surface 6, it is ensured that the front surface 6 differs in a highly differentiated manner, so that a distinctive, characteristic overall appearance is created.

While the previously described embodiments of the invention were designed as round lights, shows Fig. 5 an embodiment of a recessed luminaire in a rectangular or square shape. In general, polygonal lights can be realized according to the construction principle according to the invention. As lighting means 7 are preferably used compact fluorescent lamps. However, this type of light source does not constitute a restriction. Depending on the design and also the size of the luminaire, the respectively most suitable luminous means can be used, in particular also LEDs, optionally with special additional optics.

The basic structure of the rectangular luminaire after Fig. 5 corresponds to the basic structure of the previously described round light after Fig. 4 , The luminous element 2 is detachably connected to the formally adapted housing 1 and comprises a radial light section 9, an inclined surface region 5 and a front surface 6.

The peculiarity of this not limited to rectangular lights, but equally applicable to round lights embodiment is that the filament 2 is not formed in one piece, but in several parts, in particular the front surface 6 is formed by a separate surface element, which is layered and a micro-prismatic comprises, whose outer prism surface is covered by a preferably crystal-clear outer layer and on the inside of which preferably a diffuser film is provided.

By this construction, compared to an opal glass version significantly higher efficiency combined with glare freedom is achieved.

The layer structure may also be modified depending on the particular requirements, e.g. in that instead of a crystal-clear, the micro-prism surface from contamination protective top surface a cover layer is selected with specially selected light transmission properties.

The intended for the front surface 6 multi-layer structure preferably has a peripheral frame 20 which may be integrally formed on the outer glass surface and is a separate unit, which can be positively bonded or welded to a receiving end portion 21 of the filament 2.

The adjoining the inclined surface region 5 end portion 21 is translucent and forms a front light area complementary narrow side luminescent surface.

Fig. 6 shows a further embodiment of the invention in the form of a rectangular lamp in built-in version analogous to the embodiment according to Fig. 4 with an edge flange 35 having a rectangular mounting tray. Also in this case, a design is chosen instead of a one-piece filament, in which the front surface 6 is designed as a separate component, which is inserted into an adjoining the inclined surface region 5 end portion or placed on this and in connection with Fig. 5 already described structure has.

The partial section view after Fig. 7 shows details of the structure of a according to Fig. 5 or 6 executed recessed light.

In this case, the reflector pot 14 has a base surface 22 which extends outward in the region of the bottom of the housing 1 and ends radially, but within the vertical projection of the front surface 6, adjoining which is a sloping wall region 23 which merges into a vertical wall section 33 which the usual, the respective mounting wall cross-flange 35 has.

The in this case preferably turn multi-part formed luminous body 2 is glued or welded via its vertical wall portion 17 with the peripheral edge of the front surface 6, which is formed by a micro prismatic disc, the inside is usually associated with a diffuser film and the outside, ie on the side of the microprisms are located, is provided with a crystal clear cover 26, the extends in this embodiment, also on the vertical wall portion 17 and this engages over like a hood. In this way, the edge portion formed by the vertical wall portion 17 is designed as a light emitting surface, since this vertical wall portion 17 is positioned so as to be located in the direct light area of the respective bulbs.

The detachable connection of luminous element 2 and housing 1 is preferably via toggle lever buckles 27, which are easy to operate and have the advantage that they are accessible via the space between the luminous body 2 and reflector pot 14 and virtually blind. Conveniently, a recessed grip 36 is provided in the base surface 22.

Such a tension lock consists of a housing 1 to be fastened bearing block 28 to which a lever 29 is pivotally mounted with its one end, while the other end of this lever 29 is pivotally mounted on a longitudinally elastic actuating and locking lever 27, with his from Operating end facing away a clip attachment 32 of the filament 2 engages over and thus pulls the filament 2 against the housing 1 during closing or clamping of the actuating lever 27. Between housing 1 and luminous element 2, a seal is preferably provided which is required for outdoor use and which serves to prevent the ingress of dust in the interior.

To secure the connection between the luminous body 2 and the housing 1, which is particularly useful when mounting the lamp in the outdoor area, the clamping lock can be secured by means of an insertable via a blocking opening 31 in the operating lever 27 screw.

In order to prevent the aesthetic appearance of the luminaire from being impaired by the tension locks, at least the part 30 of the actuating lever 27 located in the area of the radial light section 9 consists of light-transmitting material. The actuating lever is located in the tensioned state in a matching recess of a Radialleuchtflächenebene extending from the inclined surface 5 of the filament 2 down and runs flush with the housing.

Fig. 8 shows a designed in the form of a surface-mounted, but also in the sense of the preceding explanations as a recessed design variant of the invention, in which a plurality of mutually spaced on a support surface 18 arranged LED's 19 is provided as a lighting means, each LED 19 a specially designed attachment optics 37th is assigned, which ensures both an axial bundling and a lateral radiation of the light generated by the respective associated LED. As LED's here wide emitting LED's, preferably LED's are used with a beam angle of about 120 °. The support surface 18 for the LED's 19 with associated attachment optics 37 is preferably positioned within the lamp body so that the laterally emitted by the attachment optics 39 light hits at least partially on the radial light portion 9 of the lamp. Adjacent to the support surface 18, a diaphragm plate 38 is preferably provided, the passage openings for the frustoconical elements of translucent material existing attachment optics 37 has. By positioning this diaphragm plate 38, the proportion of the laterally emitted light can be influenced, which strikes the radial light section 9 as direct light.

Of particular importance in connection with this embodiment of the invention is that the number and distribution of the LED's on the support surface 18 can be chosen such that the axially directed light beam on the front surface 6 of the lamp adjacent to each other or at least in the edge regions overlap each other and thus front surface side, a high and uniform luminance is generated.

The luminaire according to the invention can also be designed as a suspended luminaire, in which case an at least partially open housing bottom can be provided in order to achieve an additional indirect light output via a ceiling reflection.

All embodiments of the luminaire according to the invention are due to their flatness also suitable as an information carrier and can therefore be used for example as pictogram or house number lights use.

LIST OF REFERENCE NUMBERS

1

casing

2

illuminant

3

base region

4

outdoors

5

sloping surface

6

front surface

7

Lamp

8th

attachment section

9

Radial light section

10

Transition stage

11

washer

12

coupling member

13

annulus

14

reflector pot

15

opening plane

16

floor area

17

Vertical wall section

18

support surface

19

LED

20

frame

21

end

22

footprint

23

Slanting wall area

24

support area

25

prism Screen

26

Glass liner

27

Lever Release

28

bearing block

29

pivoting lever

30

translucent lever area

31

blocking opening

32

terminal approach

33

Vertical wall section Reflector pot

34

ballast

35

edge flange

36

grip

37

optical head

38

restrictor plate

Claims (30)

1. A luminaire, comprising a pot-shaped housing (1) which has a base surface
   and on which illuminants (7, 19) and associated electrical components are mounted; and
   into which a luminaire member (2) comprising a frosted opal glass or a corresponding plastic engages in a shape matched manner and is releasably fastened to the housing (1),
   wherein the luminaire member (2) includes a base region (3) which at least substantially corresponds to an axial extension of the housing and which consists of a fastening section (8) engaging into the pot-shaped housing (1) and of a radial light section (9) disposed between the fastening section (8) and a slanted surface (5) of the luminaire member (2), wherein furthermore the slanted surface (5) expands continuously starting from the radial light section (9) belonging to the base region (3) and merges either directly or via a vertical wall section (17) into a front surface (6) extending approximately perpendicular to the central axis of the luminaire member;
   and the slanted surface (5) includes an angle of less than 50° with the base surface of the housing (1);
   and the illuminant or illuminants (7, 19) is or are positioned and/or designed beneath the cross-sectional plane corresponding to the start of the slanted surface (5) such that both the radial light section (9) and the front surface (6) are illuminated with direct light by the illuminants (7, 19) substantially over their whole area and the total slanted surface (5) is substantially only disposed in the sidelight region of the illuminants (7, 19) to achieve a lower light density in comparison with the front surface (6) such that it only has a subsidiary appearance in a technical light aspect, but contributes to a clear differentiation between direct light and indirect light.
2. A luminaire in accordance with claim 1,
   characterized in that
   the illuminants (7, 19) are disposed beneath the start of the cross-sectional plane corresponding to the radial light section (9) disposed before the slanted surface (5).
3. A luminaire in accordance with claim 1 or claim 2,
   characterized in that
   the axial height of the radial light section (9) is smaller than the axial height of the slanted surface section (5) extending up to the front surface (6).
4. A luminaire in accordance with claim 3,
   characterized in that
   the axial height of the radial section (9) amounts to 30% to 60% of the height of the slanted surface section.
5. A luminaire in accordance with claim 1,
   characterized in that
   the slanted surface (5) includes an angle in the range from approximately 25 to 45° with the base surface of the housing (1).
6. A luminaire in accordance with claim 1,
   characterized in that
   a transition is provided between the fastening section (8) and the radial light section (9) in the form of a step (10), in particular a right-angled step, associated with an increase in diameter.
7. A luminaire in accordance with claim 1,
   characterized in that
   a ring plate (11) is positioned in the region of the radial light section (9) and with a presettable axial spacing with respect to the slanted surface (5), said ring plate extending at least substantially parallel to the front surface (6) and its diameter being larger than the diameter of the front surface (6).
8. A luminaire in accordance with claim 6 and claim 7,
   characterized in that
   the ring plate (11) is arranged at the level of the transition step (10) between the fastening section (8) and the radial light section (9) and is connected to the housing (1) via coupling elements (12).
9. A luminaire in accordance with claim 8,
   characterized in that
   the radially inner region (24) of the ring plate (11) is made as an at least partly open, light permeable region.
10. A luminaire in accordance with one of the claims 7, 8 or 9,
    characterized in that
    the ring plate (11) is made as a top wall of a ring space (13) at least partly surrounding the housing (1) for the reception of electronic units, e.g. a motion detector or ballast.
11. A luminaire in accordance with any one of the preceding claims,
    characterized by
    a design in the form of a built-in luminaire flush with a ceiling or a wall and having a reflector pot (14) which surrounds the luminaire member (2) on all sides with radial spacing and whose opening plane (15) extends at least substantially corresponding to the plane of the front surface (6) of the luminaire member (2).
12. A luminaire in accordance with claim 11,
    characterized in that
    the reflector pot (14) has a base surface (16) which extends, starting from the upper end region of the housing (1), at a predefinable angle and preferably approximately parallel to the slanted surface (5) of the luminaire body (2) and which merges in the vertical region of the slanted surface (5) into a vertical wall section (33).
13. A luminaire in accordance with claim 11,
    characterized in that
    the reflector pot (14) has a base surface (22) which is disposed in the region of the housing base, extends radially outwardly, ends inside the vertical projection of the front surface (6) and is adjoined by a slanted wall region (23) which merges into a vertical wall section (33).
14. A luminaire in accordance with claim 13,
    characterized in that
    the angle between the housing base and the slanted wall region (23) is larger than the angle between the housing base and the slanted surface (5) of the luminaire member (2) disposed opposite the slanted wall region (23).
15. A luminaire in accordance with claim 13,
    characterized in that
    the angle between the housing base and the slanted wall region (23) is smaller than the angle between the housing base and the slanted surface (5) of the luminaire member (2) disposed opposite the slanted wall region (23).
16. A luminaire in accordance with claim 1 or claim 2,
    characterized in that
    fluorescent lamps, in particular of ring or rod shape, positioned in the region and at the level of the fastening section (8) of the luminaire member (2) or compact fluorescent lamps with at least four light rods are provided as the illuminants (7).
17. A luminaire in accordance with claim 1 or claim 2,
    characterized in that
    LEDs (19), in particular monochromatic LEDs, arranged on at least one support surface (18) are provided as illuminants (7), with the support surface (18) being positioned in the region of the radial light section (9) of the luminaire member (2) at the housing side.
18. A luminaire in accordance with claim 17,
    characterized in that
    the support surface (18) is reflective.
19. A luminaire in accordance with any one of the claims 1, 11 and 14 to 17,
    characterized in that
    the luminaire member (2) is made as a round luminaire or polygonal luminaire, in particular a rectangular luminaire, and an optionally associated reflector pot (14) is matched in its shape.
20. A luminaire in accordance with claim 19,
    characterized in that
    the luminaire member (2) consists of opal glass or of a plastic material effective in a technical light manner.
21. A luminaire in accordance with claim 19,
    characterized in that
    the luminaire member (2) comprises a plurality of parts, in particular adhesively bonded or welded together, with at least the front surface (6) including a layer structure having a microprism screen whose outwardly disposed prisms are covered by an outer surface which is preferably as clear as glass and at whose inner side a diffuser foil is preferably provided.
22. A luminaire in accordance with claim 21,
    characterized in that
    the layer structure forming the front surface (6) can be connected in a shape matched manner to the matched free end section (21) of the luminaire member (2) directly or via a frame (20) surrounding the layer structure and preferably made in one part with the outer surface, which is as clear as glass, to form a unit.
23. A luminaire in accordance with claim 21 or claim 22,
    characterized in that
    the region of the luminaire member (2) adjoining the front surface (6) and preferably formed by the end section (21) forms a peripheral, in particular opal lighting surface.
24. A luminaire in accordance with claim 1 or claim 11,
    characterized in that
    the luminaire member (2) is fastened to the housing (1) via over center lever clamps (27) supported at the housing (1) and in particular accessible via the space between the luminaire member (2) and the reflector pot (14).
25. A luminaire in accordance with claim 24,
    characterized in that
    the over center lever clamps (27) are arranged externally flush in cut-outs of the housing (1) and of the radial light section (9) in the clamped state.
26. A luminaire in accordance with claim 24 or claim 25,
    characterized in that
    at least the part of the clamp (27) extending over the level of the radial light section (9) is light permeable.
27. A luminaire in accordance with claim 1,
    characterized in that
    a plurality of mutually spaced apart LEDs (19) arranged in a plane parallel to the front surface (6) of the luminaire member (2) are provided as illuminants (7);
    in that an optical attachment (37) is associated with each LED (19) and effects both an axial bundling and a lateral radiation of the light; and
    in that the LEDs (19) with the associated optical attachment (33) are positioned preferably at least partly in the base region (3) of the luminaire member (2).
28. A luminaire in accordance with claim 27,
    characterized in that
    widely radiating LEDs having a radiation angle of preferably approximately 120° are used as the LEDs (19).
29. A luminaire in accordance with claim 27 or claim 28,
    characterized in that
    the number and distribution of the LEDs (19) with optical attachment (37) are selected such that the axially directed light bundles are incident on the front surface (6) substantially adjacent to one another or overlapping one another in the marginal regions.
30. A luminaire in accordance with one of the claims 27 to 28,
    characterized in that
    the elements forming the optical attachment (37) and made of light permeable material are designed in truncated cone shape and the associated LEDs (19) are arranged centrally at the end of the elements having the smaller diameter.

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