DE4414742A1 - Luminaire with at least one ring-shaped illuminant - Google Patents

Abstract

The ring shaped fluorescent tube(1) is encircled toroidally by both reflector parts(4,5). Several anti-glare elements(3) are fixed at a distance to each other essentially the fluorescent tube(1), with one end respectively at one of reflector parts(4,5), whilst the other end of the respective anti-glare element projects freely. The inner end of the anti-glare element(3) is arranged essentially at the height of the fluorescent tube(1) at the inner reflector part(4). The end of the anti-glare element(3) fixed at the reflector(2), is fitted at the inner reflector part(4). <IMAGE>

Description

The invention relates to a lamp with at least a ring-shaped lamp and one Illuminated, essentially ring-shaped, multi-part reflector.

Luminaires with lamps arranged in a ring, e.g. B. annular fluorescent tubes are in the prior art known. With some lights the ring-shaped light is on medium within an annular, multi-part reflector arranged, which consists of a parabolic part and a arranged frusto-conically within this Part exists. The outer surface of the truncated cone faces in the shape of an involute. The transition from parabolic to the frustoconical part is designed so that behind the frustoconical part an annular undercut is formed in the ring-shaped fluorescent tube is arranged. Due to the arrangement of the ring lamp it is so shielded that it cannot be viewed by an observer can be seen directly. Optionally can be in the center of the cone a downlight be arranged bluntly. The low beam properties of such a lamp are essentially good, however, the cost of realizing one is Glare relatively high.

It is the object of the present invention to provide a lamp of the type mentioned that provide a simple trained anti-glare system that is inexpensive is to be produced.

This object is achieved in that the Reflector is formed in two parts and circulate from one the outer and one concentrically arranged around running inner reflector part is that the light  middle surrounded by the two reflector parts like a torus and that several shielding elements are spaced apart essentially below the lamp with one end are attached to each of the reflector parts, while the other end of the respective shielding element freely collar.

Although arranged in the reflector anti-glare elements, for. B. at linear lamps, already known, however, extended so far this always from the inner to the outer reflector wall. The one-sided suspension of the anti-glare elements has ins special the advantage that only the inner reflector ver with fastening points for the dimming elements must be seen. After mounting the shielding elements on the inner reflector part, the inner reflector part is in the outer reflector part fitted. The material and manufacture As a result, the cost of production is reduced without any appreciable weakening the dimming properties reduced.

In a preferred embodiment, this is on the reflector attached end of the anti-glare elements to the inner reflect gate part attached. This makes it z. B. in a later Change of light source only necessary, the inner reflect gate part with the shielding elements arranged thereon from the remove the remaining lamp body to access the To have bulbs. Furthermore, internal reflectors divide with the most varied dimming elements into one otherwise constant luminaire body can be used. The invention has now also achieved that when using an annular reflector and several Dimming elements that do not touch the outer reflector part reach that in the vicinity of the outer reflector part false radiation passing through the shielding elements in the ge compared to linear luminaires is quantitatively so low and exits at such an angle that the dimming stops these non-continuous dimming elements is adversely affected.  

A ring lamp is preferred as the annular illuminant, e.g. B. used in the form of an annular fluorescent tube. Reduced by using a single lamp the number of electrical connections required gene.

To emerge at a flat angle to the horizontal converting light rays into diffuse radiation, the shielding elements can be substantially radial to Center axis of the lamp can be arranged. Cheaper the shielding elements are each 5 to 30 °, preferably 15 ° to the center axis of the lamp ver sets, arranged. Due to the uniform arrangement of the Dimming elements also have a uniform dimming.

In a preferred embodiment, the inner and outer reflector part in cross section essentially the shape of a cycloparabic section, the Re Flektorteile essentially in the area above the Befe Stigungsstellen the shielding elements connected to each other could be. Each reflector part is therefore simple profile to be produced, which is only used to form the ver ring-shaped reflector with the other reflector part is bound.

In particular, the inner and outer reflector part in be train on the illuminant be concavely curved. Such Curvature enables the focal points of the cyclo parabolic sections on the outer circumference of the lamp lying.

Conveniently, the shielding elements can essentially be crescent-shaped, which has the advantage that the Reflector aperture is as narrow as possible and that a as large a share as possible that already within the target jet Incoming radiation exit unhindered  can. The inner end of the anti-glare elements can essentially Chen at the level of the lamp on the inner reflector part be attached so that the view of the slat holder ring at flat angles is avoided.

Furthermore, the top and bottom of the crescent-shaped Dimming elements each have circular arc segments whose respective centers on a common, essentially Chen axis through the connecting line. In particular the dimming values required by the standard be reached, the length of the is within the reflect tors arranged Abblendelementabschnittes approximately between 0.6 to 0.9 times the exit width of the reflector.

The functionality of the lamp can be increased by that from around the outside of the inner reflector part delimited area as an accessory space for arrangement and recording of cover elements, e.g. B. ceiling tiles and / or additional Chen lighting components, e.g. B. downlights, spotlights and / or building components, e.g. B. sprinklers, Speakers, air conditioning / ventilation systems can be used.

Furthermore, protection should be sought separately for one Luminaire with at least one ring-shaped light medium, essentially associated with the illuminant ring-shaped, multi-part reflector and one in essence Chen bounded by the inner outside of the reflector Area used as an accessory room for arranging and accommodating in particular lighting components can be used, in particular according to one of claims 1 to 12. In this Luminaires have openings in the inner reflector part arranges, through the light emitted by the illuminant enters the accessory room and through a lower opening of the accessory room in the free space. Through this Embodiment becomes part of the luminous flux in the accessories branched out, which is then proportionately through the lower Opening is radiated into the room to be illuminated. Here  through can have its own light source for in the center brought lighting technology components are eliminated. Cheaper the lower opening of the accessory room can at least partially covered by a lamp glass.

A particular advantage is when the lamp glass is a diffuse glass pane. The strong radiation the main reflector is then covered with a soft diffuse Radiation superimposed. The shimmer of this pane is there for, the luminance contrast between the luminaire and the surroundings to bring to a comfortable level and glare sensations to reduce. The viewer is visually symbolized where the light comes from and the lamp serves as heaven sentence. This is particularly due to the combination of ge directional light and diffuse light emphasizes what is also a Characteristic of daylight is.

The openings are preferably essentially the same Height as the illuminant arranged to be as possible to bring a large amount of radiation into the accessory room. This is also reinforced by the fact that the breakthroughs ever Weil can be arranged between the shielding elements.

The efficiency can be increased by adding accessories space at least one reflector component is arranged, the light emerging from the openings onto the lamp glass distracts. It is preferably essentially coaxial with Luminaire axis as a reflector component a truncated cone ger reflector arranged in the accessory room, the outer surface is essentially curved to make the light as equal as possible let it hit the lamp glass moderately.

In a further preferred embodiment, the Dimming elements essentially consist of prismatic lenses be educated. With appropriately designed lenses NEN very good light characteristics in this embodiment risks can be achieved. In particular, all can be dipped  elements together to be formed by a ring lens at least on its underside corresponding prismatic Aus has taking. The manufacturing and assembly effort leaves reduce significantly through this training.

Advantageous to achieve suitable dimming properties are the prismatic recesses with a triangular cross section shaped. The ring lens can be on the top on the other hand, be essentially flat.

Particularly favorable for the introduction of light rays in the accessory room, it is when the ring lens with its inside the edge at least partially engages in the openings, and so part of the light rays through the lens in the zu auditorium is led.

In order to maximize the luminous flux in the accessories space and also the shape of the ring lens To simplify an annular breakthrough inside Reflector part can be provided, in which the inner edge of the Ring lens engages.

In a further advantageous embodiment, the Dimming elements are designed in the form of a grid. In this context, all possible grids are conceivable shapes, such as B. Polygon and round shapes. Grid have also proven as anti-glare elements.

So that the largest possible area below the light covered, the grid can be formed in one piece his.

Conveniently, the grid is essentially made up of several cylindrical cell bodies with essentially centric Light passage openings built. Are advantageous the cell bodies are strung together to Luminaire axis arranged concentric circles  net to a relatively regular structure of the grid pass.

Furthermore, the dimming properties of the grid are there by improved that the diameter of the cell body and the respective light passage openings to the outside from Increase pitch circle to pitch circle. Has an advantageous effect thereby also from when the heights of the cell body and the respective light passage openings to the outside from Increase pitch circle to pitch circle.

So that the attachment point on the inner reflector part is possible Lich can be arranged at the level of the lamp the cell bodies of different sub-circles at least partially arranged offset in height from each other.

The efficiency can be increased in particular by that the inner surfaces of the light passage openings are curved are formed so that each the diameter of the light passage opening at the upper end of the cell body smaller is as at the bottom.

Advantageously, the anti-glare elements on a essential circumferential support ring to be arranged on the inner reflector part is attached. This allows all dimming elements by a single handle on Reflector to be attached.

Furthermore, the openings can be arranged in the support ring be, whereby the reflector is only a geometrically one fold ring recess needed to fit the support ring.

In the following, embodiments of the present Er Finding explained in more detail with reference to a drawing. It shows:

Fig. 1 is a full section of a first embodiment of the luminaire according to the invention,

Fig. 2, the half of a bottom view of the lamp of FIG. 1,

Fig. 3, the reflection of two fictitious light rays in the lamp shown in Figs. 1 and 2,

Fig. 4 shows a comparison between linear lamp and lamp OF INVENTION dung invention in a bottom view,

Figure 5 Flektor. A cross-section through the inventive Re,

Figure 6 is light. A cross section through a similar linear, which has the same cross-section reflector,

Fig. 7 is a schematic cross-sectional view of a second embodiment of the present dung OF INVENTION,

Fig. 8 is a schematic bottom view of a section of a second variant of a Teilaus dimming element in the form of a prismatic lens,

Fig. 9 cut the prismatic lens of Fig. 8 taken along line IX-IX and incorporated into the inventive lamp,

Fig. 10 cut the prismatic lens of Fig. 8 taken along the line XX,

Fig seen. 11 is a view of the prismatic lens of Fig. 8 from the direction XI of,

Fig. 12 is a bottom view of a further variant of dimming elements installed in the lamp in a partial view and

Fig. 13 cut the lamp of FIG. 12 along the line XIII-XIII.

The embodiment of the present invention shown in FIGS . 1 and 2 essentially comprises an annular illuminant 1 in the form of an annular fluorescent tube, an annular reflector 2 assigned to the illuminant 1 and a plurality of shielding elements 3 arranged essentially within the reflector. The ring-shaped reflector 2 consists of an inner and an outer ring-shaped reflector part 4 , 5 that is concavely curved with respect to the illuminant 1 . The reflector parts 4 , 5 have a cross-section essentially the shape of a Cycloparabelabschnit tes, which are connected to each other in the area above attachment points of the blend elements. As can be seen in particular in FIG. 1, the reflector 2 can change into an involute shape on both sides in the area above the illuminant, so that the light beams are not reflected back into the illuminant 1 in this area.

The reflector 2 can be divided in the reflector cross-sectional axis 6 ge. However, an asymmetrical division in the loading area above the fastening point 9 of the shielding elements 3 is preferred, so that the outer reflector part 5 covers a larger cross-sectional area than the inner reflector part 4 and the inner reflector part 5 together with the shielding elements 2 from without much effort Luminaire can be removed.

Shielding elements 3 are mounted on the inner reflector part 4 in regular spaced lamellar which are each a circular arc-shaped upper and lower edges 7, 8 to have, wherein the center points of the circular arcs flektorquerschnittsachse on the Re 6, so that the low beam elements 3 are substantially a crescent shape exhibit. The shielding angle should advantageously be constant over the entire anti-glare area. The attachment point on the inner reflector part 4 is generally designated by the reference number 9 , since the attachment of the anti-glare elements 3 can be carried out on the inner reflector part 4 in various ways. The attachment point 9 is located essentially at the same height as the illuminant 1 . The arrangement of the anti-glare elements 3 takes place in such a way that the anti-glare elements 3 are arranged essentially radially to the central axis 10 of the lamp 1 . The shielding elements 3 are each offset by 15 ° about the central axis 10 of the lamp 1 . The lamella-shaped anti-glare elements 3 can have a rectangular shape in cross section or a trapezoidal shape with preferably curved side edges. The side surfaces of the anti-glare elements 3 can be mirrored.

The length L of the arranged within the reflector 2 from glare element section is approximately between 0.6 to 0.9 times the outlet width A of the reflector 2 . The free end of the shielding elements 3 is chamfered in such a way that the lower edge 8 leads closer to the outer reflector part 5 than the upper edge 7 .

Furthermore, the area delimited from the outside 11 of the inner reflector part 4 can be used as an accessory space 12 for arranging and accommodating various elements. In Fig. 1 an embodiment is shown in which, for. B. a cover member 13 is arranged in the form of a ceiling plate in the accessory room 12 . For this purpose, the inner reflector part 4 has a circumferential collar 14 for supporting the cover element 13 . Furthermore, additional lighting components, such as. B. downlights, spotlights, etc. and / or building components such. B. sprinklers, speakers, air conditioning / ventilation systems, in and at the area of the accessories room 12 .

The embodiment shown in the figures is a recessed ceiling luminaire which has on its outer reflector part 5 a circumferential flange 15 which is supported against a mounting ceiling 16 , while the reflector 2 , the illuminant 1 and the shielding elements 3 within an opening in the ceiling plate 16 are arranged. For fastening the lamp to the ceiling plate 16 , known claws 17 which engage behind the ceiling plate 16 and are adjustable with a spindle drive are used.

The following is the mode of operation and functioning of the above described embodiment explained in more detail.

For illustration, reference is made to Fig. 4, which shows a linear lamp with a linear lamp 18 and a Linearre reflector 19 and a circular lamp with an annular reflector and illuminant. The reflectors of the two lights should have the same cross-section. If a fictional light beam is emitted at point B of the two lights, which is tangent to the round illuminant and can therefore be viewed as a boundary beam, then this light beam reflected at point c is of lower intensity than if the same light beam was at point D of the linear reflector 19 would be reflected. As a result, a dimming in this area must follow a linear light in this area, whereas with the circular light in this Winkelbe rich a soft transition of light intensity prevails, and a corresponding dimming on the outer edge area without significant impairment of the dimming properties can be dispensed with can. As shown in particular in FIG. 6, the dimming element 20 must therefore extend from one to the other reflector part 21 , 22 in a linear light.

In contrast to linear lights, FIG. 5 shows a cross section of a ring light according to the invention, in which the glare element 3 is only attached to the inner reflector part 4 and the free end of which is arranged at a distance from the outer reflector part 5 . Due to the curvature of the ring-shaped lamp occurs through the gap 23 formed between the anti-glare element 3 and the outer reflector part, only a small proportion of false radiation occurs, which influences the anti-glare properties only marginally.

In Fig. 3, a fictitious ray 24 and a fictitious ver ray 25 are drawn in the present embodiment. The beam 24 begins at point a and is reflected on the outer reflector part 5 at point b and then emitted to the outside. The beam 24 is selected so that it does not hit any dimming element 3 . However, the number of such rays is so small that their light intensity no longer has a disturbing effect. In the upper view of Fig. 3, the points a and b are drawn in their projection and as a 'and b' as rotated into the cross section of the reflector. The fictitious beam 25 begins at c and is reflected on the outer reflector part 5 , at point d. Finally, this beam strikes a dimming element 3 at point e, which preferably has a diffusely reflecting upper surface. The beam 25 is selected so that it just hits a shielding element 3 . Points c, d and e are entered in the figure above similar to points a and b.

With the solution according to the invention, a lamp can also be used sufficient shielding properties with less material and Manufacturing costs are produced.

Furthermore, a second embodiment of the the invention, for which protection is sought separately, closer explained. The same and similar components are used in order to How to avoid repetitions with the same reference numbers as  in the above embodiment, referred. It will be in following only the differences from the above execution example received.

In this embodiment, the inner reflector part 4 has openings 26 which are arranged essentially at the same height as the illuminant 1 . The size and from the openings 26 are selected so that they are each arranged between the shielding elements 3 . A lower opening 27 of the accessory room 12 is covered with a lamp glass 28 . The lamp glass 28 is a diffuse glass pane that scatters incident radiation.

Furthermore, a truncated cone-shaped reflector 29 is arranged essentially coaxially to the central axis 10 , the small diameter of which is assigned to the lamp glass 28 . The outer surface of the reflector 29 is concavely curved in order to allow the light to strike the lamp glass 28 evenly.

The following is the function and operation of the two th embodiment briefly explained.

As symbolically represented by the beam 30 , a luminous flux component emitted by the illuminant 1 is radiated through the openings 26 onto the outer surface of the reflector 29 . This reflects this luminous flux component onto the luminaire glass 28 , as a result of which it is diffusely split. This causes the strongly directed radiation from the main reflector to be superimposed with a soft diffuse radiation. The shimmer of the luminaire glass 28 ensures that the luminance contrast between the luminaire and the surroundings is brought to a comfortable level and reduces glare. The viewer is visually symbolized where the light comes from and the lamp serves as a substitute for the sky. This is emphasized by the combination of directed light and diffuse light, which is also a characteristic of daylight.

A further embodiment of the present invention is explained in more detail below with reference to FIGS. 9 to 11. In the following, only the differences from the previous exemplary embodiments are discussed, which is why the same reference numerals are used for the same and similar components.

The shielding elements 3 are designed in this embodiment as a coherent prismatic ring lens 31 . The ring lens 31 has on its underside corresponding prismatic recesses 32 , the bottom 33 of which is substantially parallel to the flat top of the ring lens 31 .

The prismatic recesses are triangular in cross section, so that a circumferential, sawtooth-like profile is formed along the underside of the ring lens 31 . Furthermore, the outer edge of the ring lens 31 is provided with a chamfer 34 towards the underside thereof. The underside of the ring lens 31 does not run parallel to the top thereof, so that the ring lens 31 has an increasing thickness towards the outside until the chamfer 34 is reached . The angle of the chamfer 34 is preferably 60 ° to the vertical. In the prismatic recesses 32 , a tip angle of approximately 120 ° is preferred.

The inner edge 35 of the ring lens 31 engages in a ring-shaped opening 26 in the reflector 2 , whereby a certain portion of the luminous flux is emitted from the inner edge region of the ring lens 31 into the accessory space 12 . So that there is no dimming effect in this area, the prismatic recesses 36 still end within the reflector area.

In Fig. 9 it can also be seen that in addition to the diffuse glass lamp 28 a colored lamp glass 36 can be arranged on the opening 27 .

A further embodiment of the present invention is explained in more detail below with reference to FIGS. 12 and 13. Again, only the differences from the previous embodiments are discussed, which is why the same reference numerals are used here for the same and similar components.

In this embodiment, the shielding elements 3 are designed as a one-part grid, which is arranged below the illuminant 1 . The grid consists of several cylindrical cell bodies 37 with central light passage openings 38 . Each cell body 37 of a certain diameter are each lined up on 10 concentric circles to the lamp axis is arranged. The diameters of the cell bodies 37 , finally the respective light passage openings 38, increase outwards from the pitch circle to the pitch circle. Likewise, the heights of the cell bodies 37 including the respective light passage openings 38 increase from the circle to circle to the outside. This measure serves to improve the dimming effect.

In order to provide the highest possible fastening point 9 , the cell bodies 37 of different partial circles are arranged at least partially offset from one another in height, so that the grid is guided around the illuminant 1 in regions.

To improve the efficiency, the inner surfaces 39 of the light passage openings 38 are curved. The diameter of the light passage opening 38 at the upper end of the cell body 37 is smaller than the diameter at the lower end. Furthermore, 37 light wells 40 are formed between the cell bodies in order to loosen up the grid and improve the efficiency. The outer surfaces of the cell body 37 are preferably vaporized with a reflective layer, wherein the dotted areas of the light wells 40 in FIG. 13 can remain untreated.

The grid is arranged on a circumferential support ring 41 which is attached to the inner reflector part 4 . Such a supporting ring 41 can also be used for all other forms of glare elements 3 , whereby these can be attached together in one step to the inner reflector part 4 . As can be seen in Fig. 13, the support ring 41 is adapted to the inner contour of the reflector 2 .

To simplify the manufacture of the reflector, the openings 26 can be arranged in the support ring 41 .

Claims (36)

1. Luminaire with at least one ring-shaped lamp ( 1 ) and one of the lamps ( 1 ) assigned, essentially annular, multi-part reflector ( 2 ), characterized in that the reflector ( 2 ) is formed in two parts and from a circumferential outer and a concentrically arranged circumferential inner reflector part ( 4 , 5 ) be that the lamp ( 1 ) by two reflector parts ( 4 , 5 ) is surrounded by a torus, and that several shielding elements ( 3 ) at a distance from each other in wesentli Chen below of the illuminant ( 1 ) are attached at one end to one of the reflector parts ( 4 , 5 ), while the other end of the respective shielding element ( 3 ) projects freely. 2. Luminaire according to claim 1, characterized in that the end of the anti-glare elements ( 3 ) attached to the reflector ( 2 ) on the inner reflector part ( 4 ) is introduced. 3. Luminaire according to claim 1 or 2, characterized in that the inner end of the shielding elements ( 3 ) is arranged substantially at the level of the lamp ( 1 ) on the inner reflector part ( 4 ). 4. Luminaire according to claim 1 or 2, characterized in that the annular lamp ( 1 ) is formed by a ring lamp. 5. Lamp according to one of claims 1 to 4, characterized in that the shielding elements ( 3 ) are arranged substantially radially to the central axis ( 10 ) of the light means ( 1 ). 6. Luminaire according to one of claims 1 to 5, characterized in that the shielding elements ( 3 ) are each offset by 5 to 30 °, preferably 15 °, about the central axis ( 10 ) of the lamp ( 1 ). 7. Lamp according to one of claims 1 to 6, characterized in that the shielding elements ( 3 ) have a substantially lamella shape. 8. Lamp according to one of claims 1 to 7, characterized in that the inner and outer reflector part ( 4 , 5 ) each have a cross-section substantially in the form of a cycloparabic section. 9. Luminaire according to one of claims 1 to 8, characterized in that the reflector parts ( 4 , 5 ) substantially in the area above the fastening points ( 9 ) of the shielding elements ( 3 ) are interconnected. 10. Lamp according to one of claims 1 to 9, characterized in that the inner and outer reflector part ( 4 , 5 ) with respect to the lamp ( 1 ) are concavely curved. 11. Luminaire according to one of claims 1 to 10, characterized in that the upper and lower edges ( 7 , 8 ) of the crescent-shaped shielding elements ( 3 ) each have circular arc segments, the centers of which lie essentially on the reflector cross-sectional axis ( 6 ). 12. Light according to one of claims 1 to 11, characterized in that the length (L) of the inside of the reflector ( 2 ) arranged Abblendelementabschnittes approximately between 0.6 to 0.9 times the outlet width (A) of the reflector ( 2nd ) lies. 13. Luminaire according to one of claims 1 to 12, characterized in that the area delimited from the outside of the inner reflector part ( 4 ) as an accessory space ( 12 ) for arranging and receiving cover elements ( 13 ), for. B. ceiling tiles, and / or additional light technical components, eg. B. downlights, spotlights, and / or building components, e.g. B. sprinklers, speakers, air conditioning / ventilation systems can be used. 14. Luminaire with at least one ring-shaped lamp ( 1 ), one of the lamps ( 1 ) assigned, substantially ring-shaped, multi-part reflector ( 2 ) and a substantially from the inner outside of the reflector ( 2 ) delimited Be rich as Accessory ( 12 ) for arranging and receiving, in particular, lighting components can be used, in particular according to one of claims 1 to 13, characterized in that openings ( 26 ) are arranged in the inner reflector part ( 4 ) through which the illuminant ( 1 ) emitted light enters the accessory room ( 12 ) and emits through a lower opening ( 27 ) of the accessory room ( 12 ) into the free space. 15. Lamp according to claim 14, characterized in that the lower opening ( 27 ) of the accessory space ( 12 ) is at least partially covered by a lamp glass ( 28 ). 16. Luminaire according to claim 15, characterized in that the lamp glass ( 28 ) is a diffuse glass pane. 17. Lamp according to one of claims 14 to 16, characterized in that the openings ( 26 ) are arranged in wesent union at the same height as the lamp ( 1 ). 18. Light according to one of claims 14 to 17, characterized in that the openings ( 26 ) are each arranged between the shielding elements ( 3 ). 19. Luminaire according to one of claims 14 to 18, characterized in that at least one reflector component is arranged in the accessory space ( 12 ), which deflects light emerging from the openings ( 26 ) onto the lamp glass ( 28 ). 20. Luminaire according to one of claims 14 to 19, characterized in that a truncated cone-shaped reflector ( 29 ) is arranged in the accessory space ( 12 ) substantially coaxially to the lamp axis ( 10 ) as the reflector component, the lateral surface of which is essentially concavely curved. 21. Luminaire according to one of claims 1 to 20, characterized in that the shielding elements ( 3 ) are essentially designed as prismatic lenses. 22. Luminaire according to claim 21, characterized in that all shielding elements ( 3 ) are formed together by an annular lens ( 31 ) which has corresponding prismatic recesses ( 32 ) at least on its underside. 23. Luminaire according to claim 22, characterized in that the prismatic recesses ( 32 ) have a triangular shape in cross section. 24. Luminaire according to claim 22 or 23, characterized in that the top of the ring lens ( 31 ) is formed substantially flat. 25. Lamp according to one of claims 21 to 24, characterized in that the ring lens ( 31 ) with its inner edge ( 35 ) at least partially engages in the openings ( 26 ). 26. Luminaire according to one of claims 21 to 25, characterized in that an annular opening ( 26 ) in the inner reflector part ( 4 ) is provided, in which the inner edge ( 35 ) of the ring lens ( 31 ) engages. 27. Light according to one of claims 1 to 20, characterized in that the shielding elements ( 3 ) are designed in the form of a grid. 28. Luminaire according to claim 27, characterized in that the grid is formed in one piece. 29. Luminaire according to claim 27 or 28, characterized in that the grid is constructed from a plurality of substantially cylindrical cell bodies ( 37 ) with a substantially central light passage openings ( 38 ). 30. Luminaire according to claim 29, characterized in that the cell bodies ( 37 ) are arranged in a row on circles concentrically running to the lamp axis ( 10 ). 31. Luminaire according to claim 29 or 30, characterized in that the diameter of the cell body ( 37 ) and the respective light passage openings ( 38 ) increase outwards from pitch circle to pitch circle. 32. Luminaire according to one of claims 29 to 31, characterized in that the heights of the cell body ( 37 ) and the respective light passage openings ( 38 ) increase outwards from pitch circle to pitch circle. 33. Luminaire according to one of claims 29 to 32, characterized in that the cell bodies ( 37 ) of different partial circles are at least partially offset in height from each other. 34. Luminaire according to one of claims 29 to 33, characterized in that the inner surfaces ( 39 ) of the light passage openings are curved, so that in each case the diameter of the light passage opening ( 38 ) at the upper end of the cell body ( 37 ) is smaller than at the lower The End. 35. Luminaire according to one of claims 1 to 34, characterized in that the shielding elements ( 3 ) are arranged on a substantially circumferential support ring ( 41 ) which is attached to the inner reflector part ( 4 ). 36. Luminaire according to claim 35, characterized in that the openings ( 26 ) are arranged in the support ring ( 41 ).