LIGHTING FIXTURE

Abstract

A luminaire for illuminating building spaces or building part-spaces, including a light source, which has at least one LED, as well as a collimator optics and a reflector, wherein a radially inner light fraction emitted by the light source hits the collimator optics and is focused thereby, and wherein a radially outer light fraction emitted by the light source bypasses the collimator optics, hits the reflector and is focused thereby.

Claims

1-30. (canceled)

31. A luminaire for illuminating building spaces or building part-spaces, comprising a light source, which has at least one LED, as well as a collimator optics and a reflector, wherein a radially inner light fraction emitted by the light source hits the collimator optics and is focused thereby, and wherein a radially outer light fraction emitted by the light source bypasses the collimator optics, hits the reflector and is focused thereby.

32. The luminaire according to claim 31, wherein the collimator optics comprises a light entry surface provided by a cavity.

33. The luminaire according to claim 32, wherein, in a direction transverse to an optical axis of the collimator optics, the cavity has a dimension that exceeds a dimension of the light source.

34. The luminaire according to claim 31, wherein the collimator optics is arranged such that its portion closest to the light source is arranged at a bypassing distance from the light source along an optical axis of the collimator optics.

35. The luminaire according to claim 31, wherein the light source is arranged in a focal point of the reflector, which is parabolic or substantially parabolic.

36. The luminaire according to claim 31, wherein the reflector extends, by its portion facing the light source, as far as to, or as far as to the vicinity of, an arrangement plane of the light source.

37. The luminaire according to claim 31, wherein the reflector extends as far as to the vicinity of an inner wall of a housing of the luminaire.

38. The luminaire according to claim 31, wherein the radially inner light fraction can be divided into a central light beam and a light beam surrounding said central light beam, wherein the central light beam impinges on a lens portion of the collimator optics, and the surrounding light beam is focused by means of total-reflection surfaces.

39. The luminaire according to claim 31, wherein, in the direction of its optical axis, the reflector has an axial installation height that exceeds an axial installation height of total-reflection surfaces of the collimator optics.

40. The luminaire according to claim 31, wherein the collimator optics has a maximum external diameter that is greater than 30 mm, in particular greater than 35 mm, more particularly greater than 40 mm, more particularly greater than 45 mm, more particularly greater than 50 mm, more particularly greater than 55 mm, more particularly greater than 60 mm, more particularly greater than 70 mm, more particularly greater than 80 mm, more particularly greater than 90 mm, more particularly greater than 100 mm.

41. The luminaire according to claim 31, the luminaire provides a rotationally symmetrical light distribution.

42. The luminaire according to claim 31, wherein the collimator optics is fastened to the reflector.

43. The luminaire according to claim 31, wherein the collimator optics comprises a positioning flange.

44. The luminaire according to claim 43, wherein the collimator optics extends, by its positioning flange, as far as to the vicinity of an inner wall of the reflector in the region of its free end portion that is at a maximum distance from the light source.

45. The luminaire according to claim 43, wherein the radially outer light fraction passes through the positioning flange after being reflected on the reflector.

46. The luminaire according to claim 31, wherein the reflector is fastened to a housing of the luminaire.

47. The luminaire according to claim 31, wherein the luminaire comprises a lens element downstream of the collimator optics in the light path.

48. The luminaire according to claim 47, wherein the lens element is in the form of a divergent lens.

49. The luminaire according to claim 47, wherein the lens element comprises a concavely curved light entry surface and a planar or slightly convexly curved light exit surface .

50. A system for providing building luminaires , comprising a first luminaire and comprising a second luminaire, wherein each of the two luminaires comprises a light source, which has at least one LED, as well as a collimator optics and a reflector, wherein, in each case, a radially inner light fraction emitted by the light source hits the collimator optics and is focused thereby, and wherein, in each case, a radially outer light fraction emitted by the light source bypasses the collimator optics, hits the reflector and is focused thereby, and wherein a lens element is arranged on the side of the collimator optics facing away from the light source in the light path, wherein the first luminaire for providing a first light distribution has a first lens element, and wherein the second luminaire for providing a second light distribution that is different from the first light distribution has a second lens element.

Description

[0107] Other advantages of the invention emerge from the dependent claims that have not been mentioned and from the following description of the embodiment examples shown in the drawings, in which:

[0108] FIG. 1a is a schematic partially sectional view of a first embodiment example of a luminaire according to the invention, illustrating a light drive that has a light source, comprising three LEDs, as well as a collimator optics and a reflector, which generates a parallel pencil of light, and additionally indicating a diffuser,

[0109] FIG. 1b is an enlarged detailed view of the embodiment example of the luminaire of FIG. 1a according to the part-circle Ib in FIG. 1a, illustrating the different light fractions emitted by the middle LED of the light source,

[0110] FIG. 1c is a view according to FIG. 1b of a further embodiment example of a luminaire according to the invention, with the reflector reaching as far as to the arrangement plane of the LED,

[0111] FIG. 1d shows the embodiment example of FIG. 1c, with an additional explanation of the different light fractions,

[0112] FIG. 2 shows a further embodiment example of a luminaire according to the invention, which is in the form of a lamp and arranged on a top wall of a housing, a first light distribution being generated on a side wall by the luminaire,

[0113] FIG. 3 is a view according to FIG. 2 of a further embodiment example of a luminaire according to the invention, by which a second and a third light distribution are generated,

[0114] FIG. 4 is a schematic partially sectional outline view of a further embodiment example of a luminaire according to the invention using a light drive according to FIG. 1a, additionally showing a housing of the luminaire and a first divergent lens,

[0115] FIG. 5 is a view according to FIG. 4 of a further embodiment example of a luminaire according to the invention, showing a second divergent lens different from the first divergent lens,

[0116] FIG. 6 is a schematic perspective detailed view of a reflector and a collimator optics of an embodiment example of a luminaire according to the invention, in which the reflector consists of two shell elements that can be fastened to one another in the radial direction and can hold the collimator optics between them,

[0117] FIG. 7 is a schematic perspective detailed view of a reflector and a collimator optics of an embodiment example of a luminaire according to the invention, it being possible to fasten the collimator optics to the reflector as a result of an axial insertion movement by means of locking lugs,

[0118] FIG. 8a is a view similar to FIG. 4 of a further embodiment example of a luminaire according to the invention but without the divergent lens and while illustrating a fundamentally undesirable light-beam fraction that has been emitted by the light source and hits the inner wall of the housing of the luminaire, where it is reflected, without having previously been reflected on a reflector and without having previously been influenced by optical boundary surfaces or total-reflection surfaces of the collimator optics,

[0119] FIG. 8b is an enlarged schematic partially sectional view according to FIG. 8a, for example according to part-circle VIIIb in FIG. 8a, of a further embodiment example, illustrating an additional aperture collar or a collar-like portion arranged on the collimator optics for preventing the above-described undesirable light fractions,

[0120] FIG. 9 is a view similar to the view in FIG. 8b of a further embodiment example of a luminaire according to the invention, having a collimator optics that has been altered compared with FIG. 8b and has a collar-like portion, which is in the form of a Fresnel lens and is likewise used for preventing undesirable light fractions,

[0121] FIG. 10 is a view similar to the view in FIG. 1a of a further embodiment example of a light drive according to the invention for use in a luminaire according to the invention, the light drive having a collimator and two reflectors arranged so as to be nested together,

[0122] FIG. 11 is a schematic partially sectional plan view of the light drive of FIG. 10, for example along the viewing arrow XI in FIG. 10,

[0123] FIG. 12 is a view according to FIG. 10 of a further embodiment example of a light drive according to the invention for use in a luminaire according to the invention, the light drive likewise comprising two reflectors arranged so as to be nested together but which are fastened together in a different manner compared with FIG. 10,

[0124] FIG. 13 is a schematic partially sectional enlarged view, for example along part-circle XIII in FIG. 4, of a further embodiment example of a luminaire according to the invention for illustrating a positioning of the collimator optics and the reflector relative to one another by means of a separate clamping ring, and

[0125] FIG. 14 is a view according to FIG. 13 of a further embodiment example of a luminaire according to the invention, illustrating a different clamping ring from that in the embodiment example according to FIG. 13.

[0126] Embodiment examples of the invention are described by way of example in the following description of the drawings, and with reference to the drawings. In the process, for the sake of clarity, identical or similar parts or elements or regions are denoted by the same reference numerals, in some cases with the addition of lowercase letters, in so far as it affects different embodiment examples.

[0127] Features that are described, shown or disclosed in relation to just one embodiment example can also be provided in any other embodiment example of the invention within the context of the invention. Embodiment examples altered in this way are also covered by the invention, even if they are not shown in the drawings.

[0128] All disclosed features are essential to the invention in their own right. The disclosure of the associated priority documents (copy of the previous application), of the cited documents and of the described prior-art devices is hereby incorporated in its entirety into the disclosure of the application, so as to also include one or more features of the subject matter disclosed therein into one or more claims of the present application. Altered embodiment examples of this kind are also covered by the invention, even if they are not shown in the drawings.

[0129] Embodiment examples of luminaires according to the invention are each denoted by 10 in the drawings.

[0130] FIG. 1a is a schematic perspective view of the main part of a luminaire 10 according to the invention, the so-called “light drive” 74, to illustrate the basic lighting principle. Said light drive comprises a light source 18, a collimator optics 20 and a reflector 21. The light drive generates a parallel pencil of light 61 or a substantially parallel pencil of light 61.

[0131] FIG. 1a additionally shows a diffuser 41. The precise basic lighting principle will be explained further below.

[0132] According to embodiment examples 4 and 5, a divergent lens 42 is also located downstream of the light drive 74 in the light path 62 in each case. In the process, a first divergent lens 43 according to FIG. 4 or a second divergent lens 44 according to FIG. 5 can be provided. The two divergent lenses 43 and 44 can differ from one another on account of the curvature of their light entry surface 57 and/or on account of the configuration of each light exit surface 58 in order to generate different light distributions.

[0133] In this way, a plurality of luminaires 12, 13 of the type according to the invention can provide a luminaire system 11 according to the invention. Said system will first be roughly explained on the basis of FIGS. 2 and 3:

[0134] FIGS. 2 and 3 are schematic perspective views of a first luminaire 12 (according to FIG. 2) and a second luminaire 13 (FIG. 3). The two luminaires 12, 13 form a luminaire system 11 according to the invention.

[0135] According to FIGS. 2 and 3, the luminaires are each used to illuminate a building space 14, in the form of a side wall 73 of a building room. The two luminaires 12, 13 are fastened to a top wall 72 of the building room in the region of an installation site 15. The tilt of said luminaires can, for example, be adjusted by means of a joint (only shown by way of indication).

[0136] A first light distribution 16 is cast on the building space 14 by means of the first luminaire 12, and a second light distribution 17 is cast on the building space by means of the second luminaire 13.

[0137] The first light distribution 16 and the second light distribution 17 are each rotationally symmetrical and indicate a circular area that is in particular homogeneously illuminated.

[0138] FIG. 3 also illustrates an alternative third light distribution 17b, which is shown in dashed lines in the form of an oval, i.e. non-rotationally symmetrical, light distribution.

[0139] The first light distribution 16 can be characterized by a first beam angle 63, and the second light distribution 17 can be characterized by a second, different beam angle 64.

[0140] The equivalents to the different beam angles 63, 64 can also be seen in the beam paths in FIGS. 4 and 5, the embodiment examples in FIGS. 4 and 5 obtaining different beam angles 63, 64 due to different curvatures of the light entry surface 57 of the relevant divergent lens 43, 44.

[0141] The luminaires 12, 13 according to the invention are formed as lamps 67 in accordance with the embodiment examples in FIGS. 2 and 3. However, the invention also covers a configuration in which the luminaire is formed as a surface-mounted ceiling luminaire or a recessed luminaire, or with a non-adjustable tilt.

[0142] In the following, the basic lighting principle of the light drive 74 will be explained in more detail on the basis of FIG. 1a and 1b:

[0143] As can be seen in FIGS. 1a and 1b, the light source 18 comprises a plurality of LEDs 19a, 19b, 19c. In each of the embodiment examples in FIGS. 1a and 1b, three LEDs 19a, 19b, 19c are shown. Any number of LEDs is possible, however. The light source 18 can comprise one LED but also a plurality of LEDs. If a plurality of LEDs are provided, they can be arranged substantially rotationally symmetrically, for example. For instance, FIG. 1a and 1b each show just three LEDs. However, each outer LED 19a, 19c can be arranged in a ring arrangement around the middle LED 19b, such that the light source 18 according to FIGS. 1a and 1b actually comprises two, three, four, five, six or more LEDs.

[0144] The LEDs are rigidly installed on a printed circuit board 65. The top of the printed circuit board defines an arrangement plane 34.

[0145] According to FIG. 1a, the light drive 74 comprises a collimator optics 20. This collimator optics comprises a central portion 75 and a positioning flange 54 that surrounds said central portion in an annular manner.

[0146] The central portion 75 has the optical boundary surfaces 27 and total-reflection surfaces 28 that contribute to the light focusing.

[0147] In the following, the central portion 75 of the collimator optics 20 will be described in detail:

[0148] As can be seen in FIG. 1b, the collimator optics 20 has a light entry surface 24 provided by a cavity 25.

[0149] The cavity has a top wall 27 and a circumferential side wall 26.

[0150] The top wall 27 is a component of a centrally arranged lens portion 30 of the collimator optics 20 and ensures that the light fractions hitting the top wall 27 are focused. In FIG. 4, these fractions are denoted by way of example by reference numeral 45 and are considered to be the central light beam 45.

[0151] The central light beam is surrounded by a surrounding light beam 46 (see FIG. 4). The surrounding light beam 46 comprises all the light fractions that hit the side-wall portions 26 of the cavity 25 starting from the light source 18. From here, they are first cast radially outwards, as best seen in FIG. 1b, and then hit total-reflection surfaces 28 of the collimator optics. These light fractions are likewise reflected by the total-reflection surfaces 28 towards the light exit surface 29 of the collimator optics 20 (see FIG. 1a).

[0152] Both the central light beam 45 and the light beam 46 surrounding it are collimated, as illustrated in particular in FIG. 1a, and leave the collimator optics as a parallel pencil of light 61.

[0153] Among other things, the special feature according to the invention is now that the light source 18 additionally emits a radially outer light fraction 23 (shown in FIG. 1b) that bypasses the collimator optics 20. The radially outer light fraction 23 hits a reflector 21, which has a reflection surface 55 on its inside. The reflection surface 55 is highly reflective or highly metallized.

[0154] The reflector 21 has a substantially parabolic shape. The light source 18 is arranged in the focal point 37 or in the focal-point region 37 of the reflector 21.

[0155] So that a radially outer light fraction 23 of the light fractions emitted by the light source 18 can actually bypass the collimator optics 20, the collimator optics 20 is arranged at a bypassing distance 36 from the light source 18 along the optical axis 31. This is shown in FIG. 1b.

[0156] The portion 35 of the collimator optics 20 closest to the light source 18, i.e. the lower free edge region 35 of the collimator optics, in which the side wall 26 of the cavity 25 meets the total-reflection surface 28, is arranged at said bypassing distance 36 from the light source 18 and/or from the arrangement plane 34.

[0157] This distance makes it possible to divide the light emitted by the light source 18 into a radially inner light fraction 22 and a radially outer light fraction 23 (FIG. 1b).

[0158] The radially inner light fraction 22 is captured in its entirety by the collimator optics 20. The radially inner light fraction comprises the central light beam 45, explained above in relation to FIG. 4, and the light beam 46 surrounding it.

[0159] The radially outer light fraction 23 bypasses the collimator optics 20 in its entirety and hits the reflection surface 55 of the reflector 21, where it is reflected. All, or almost all, the light that is emitted by the light source as the radially outer light fraction and bypasses the collimator optics 20 is thus captured by the reflector 21.

[0160] As a result, all, or almost all, the light emitted by the light source 18 can be used and utilized for further manipulation. A parallel pencil of light 61 having a very narrow light distribution is thus generated. In addition, the luminaire is also very efficient and makes use of all, or almost all, the light emitted by the light source 18.

[0161] In a direction transverse to the optical axis 31 of the light drive, the cavity 25 has a dimension denoted by 32, as is best seen in FIG. 1b. In the direction transverse to the optical axis 31, the dimension 32 is greater than the dimension 33 of the light source 18 in a direction transverse to the optical axis 31.

[0162] This configuration ensures that all, or almost all, the light 22 emanating from the light source 18 is captured by the collimator optics 20, apart from the radially outer light fractions 23.

[0163] To aid understanding, it should be noted that FIG. 1b, like the other figures, shows the light emission behavior of the light source 18 in a simplified manner, illustrated by a number of light beams.

[0164] For instance, FIG. 1b in particular shows only the light emitted by the middle LED 19b.

[0165] However, it is clear to the reader that corresponding light beams are also emitted by the two LEDS 19a, 19c.

[0166] The embodiment example in FIG. 1c substantially corresponds to the embodiment example in FIG. 1b, the sole difference being that the reflector 21 is still slightly closer to the arrangement plane 34. The portion 38 of the reflector 21 closest to the light source 18 is brought right up to the printed circuit board 65. As a result, light fractions emitted radially further to the outside can also be captured by the reflector 21.

[0167] On the basis of FIG. 1d, the different light fractions emitted by the light source 18 will be described and explained clearly:

[0168] The light source 18 emits radially inner light fractions 22 and radially outer light fractions 23.

[0169] The terms “radially on the inside” and “radially on the outside” are based on the optical axis 31 as a radial center.

[0170] The radially inner light fractions 22 comprise a central light beam 45 and a light beam 46 surrounding it.

[0171] The radially inner light fractions 22 are emitted along a beam angle of approximately 90°. When viewed in the plane of the paper in FIG. 1d, once the two 45° angular components shown therein to the left of the optical axis 31 and to the right of the optical axis 31, respectively, are added, the radially outer light fractions 23 extend at a total angle of almost 90°. It should be noted that the individual light sources may entail slight shadowing effects.

[0172] The central light beam 45 extends, for example, over an angle of 45°. The light beam 46 surrounding the central light beam 45 likewise extends in total over an overall angle of approximately 45°.

[0173] The size of the individual angles can vary within the context of the invention and depends on the dimensions and extension of the top surface 27 of the cavity 25 or the side-wall portions 26 of the cavity 25. In addition, it goes without saying that the size of the angles is also dependent on the distance between the collimator optics 20 and the light source 18.

[0174] The embodiment examples in FIG. 1a to 1d do not show any other components of the luminaire 10.

[0175] FIGS. 4 and 5 illustrate that the luminaire 10 according to the invention has a housing 39.

[0176] In numerous embodiment examples of the invention, this housing is circular-cylindrical.

[0177] As can be seen in FIGS. 4 and 5, each divergent lens 43, 44 can be secured on a housing cover 68, which can be releasably secured to the luminaire housing 39 by means of a mechanical interface 76.

[0178] The luminaire housing 39 and the housing cover 68 can have an inner circumferential surface that, for example, is kept black and matte to avoid any undesirable reflections and glare effects.

[0179] At this juncture, it should be noted that the divergent lenses 43 and 44 according to the embodiment examples in FIG. 5 can also be blackened on their outer peripheral surface, as indicated by a dotted line in FIGS. 4 and 5. The blackening serves to prevent light scatter and glare effects as a result of undesirable reflection. In this respect, reference is also made to German patent application DE 10 2019 119 682 A1 belonging to the applicant, which is included in full in the content of the present patent application so as to avoid repetitions and include one or more features of that post-published patent application in the application text or claims of the present patent application.

[0180] The embodiment examples in FIGS. 1a, 4 and 5 of the present patent application each show a diffuser 41 that can optionally be arranged in the beam path in order to provide blending and/or softening of the light. As a result, for example, undesirable streak effects can also be prevented.

[0181] In the embodiment examples in the drawings, the diffuser 41 is shown excessively far away from the light exit surface of the collimator optics 20. In actuality, the diffusers 41 can be closer to the light drive 74 in the large majority of embodiment examples.

[0182] The invention also covers a configuration where, in addition to a diffuser 41 of this kind or, alternatively, a diffuser 41, the light exit surface of the collimator 20 is designed in such a way that leads to a certain amount of light scatter or light mixing. For example, the light exit surface of the collimator 20 can be provided with a corresponding roughening or a microstructure.

[0183] Alternatively, only the light exit surface of the positioning flange 54 can be provided with an accordingly shaped surface, e.g. roughness.

[0184] In addition and/or alternatively, the light entry surface of the positioning flange 54, i.e. the side of the positioning flange 54 facing the arrangement surface 34, can also be provided with a roughening.

[0185] As can be seen from FIG. 1a, the reflector 21 has a highly metallized reflection surface 50. This reflection surface can, for example, be applied to a plastics injection-molded part. In particular, the plastics injection-molded part allows for particularly simple construction and manufacture of the reflector 21.

[0186] Alternatively, the reflector can also be made of aluminum or another suitable material.

[0187] As illustrated by way of example according to FIG. 1a, an installation portion 66 can advantageously be attached to the reflector 21. The installation portion 66 can be designed to secure the reflector 21 on the luminaire housing 39.

[0188] In particular, however, a fastening device 53 can also be arranged on the reflector 21. This fastening device can, for example, comprise a circumferential groove, as shown in FIG. 1. The fastening device 53 can be used to secure the collimator optics 20 on the reflector 21.

[0189] For this purpose, the collimator optics 20 can, for example, have a positioning flange 54 as indicated above.

[0190] This positioning flange is shown in particular in FIG. 1a. The positioning flange 54 extends radially outwards from the central portion 75 of the collimator optics 20.

[0191] As indicated by way of example in FIG. 6, the positioning portion can be inserted into a circumferential groove 77 in the reflector 21:

[0192] According to FIG. 6, the reflector 21 consists, for example, of a first reflector shell 69 and a second reflector shell 70. Said shells can be fastened to one another in the radial direction 78 and can grip the positioning flange 54 of the collimator optics on both sides and hold it between them.

[0193] Alternatively, as illustrated by way of example in FIG. 7, the collimator optics 20 and the reflector 21 can also be fastened in the axial direction 79, i.e. along the optical axis 31. For this purpose, a plurality of spring lugs 71a, 71b, 71c that axially secure the collimator optics 20 in the manner of snap-in hooks can be attached to the reflector 21.

[0194] By means of the fastening device 53, regardless of the configuration thereof, it is possible to obtain a relative fastening of the collimator optics 20 and reflector 21 to one another.

[0195] What is created as a result is a handling unit that ensures the collimator optics 20 and reflector 21 are positioned precisely relative to one another. Advantageously, precise positioning of said handling unit relative to the light source 18 can also be ensured.

[0196] As can be seen from the embodiment example in FIG. 4, the reflector 21 has an axial installation height 47 that exceeds the axial installation height 48 of the total-reflection surfaces 28 of the collimator optics 20. This makes it possible to configure the collimator optics 20 to have only a very small axial installation height 49.

[0197] In any case, the only thing that is crucial for the manufacture of the collimator optics 20, however, is the installation height of the central portion 75, which substantially corresponds to the installation height 48 of the total-reflection surfaces 28.

[0198] As a result of the accordingly provided combination of a collimator optics 20 with a reflector 21, the installation height 49 of the collimator optics 20 or the installation height 48 of the central portion 75 of the collimator optics can thus be retained even with large diameters 50, thereby simplifying the manufacture of the collimator optics 20.

[0199] According to FIG. 4, it is also clear that the external diameter 50 of the collimator optics is of such a size that it corresponds or substantially corresponds to the inner circumference 80 of the luminaire housing 39. As a result, all the light emitted by the light source 18 can be manipulated further.

[0200] In the embodiment examples in FIGS. 1a to 1c and 4 and 5, the fastening device 53, which allows the collimator optics 20 to be fastened to the reflector 21, is arranged in the region of the free end portion 56 of the reflector 21. However, the invention also covers a configuration in which the collimator optics 20 is fastened to the reflector 21 at a different site, e.g. closer to the portion 38 of the reflector 21 facing the light source 18.

[0201] In addition, the invention also covers a configuration in which the collimator optics 20 is secured directly relative to the luminaire housing 39, in particular independently of the reflector 21, or also, for example, secured directly rigidly relative to the arrangement surface 34.

[0202] For example, the invention also covers a configuration where the central portion 75 of the collimator optics 20 is rigidly secured relative to the printed circuit board 65 and the reflector 21 is rigidly secured relative to the luminaire housing 39 in the manner shown. In this embodiment example, the collimator optics 20 and reflector 21 are not directly interconnected. In this embodiment example, the positioning flange 54 of the collimator optics 20 can be omitted entirely.

[0203] According to the embodiment examples of the invention that are shown in the drawings, a substantially parallel pencil of light 61 exits the light drive 74. However, the invention also covers a configuration in which the pencil of light generated by the light drive 74 is either substantially parallel or not parallel.

[0204] The luminaire 10 according to the invention is used to generate a rotationally symmetrical light distribution 16, 17 or a non-rotationally symmetrical light distribution 17b.

[0205] The embodiment example in FIG. 8a corresponds to the view in FIG. 1a, but additionally showing a luminaire housing 39. In this case, a pencil of light that is undesirable per se is to be illustrated: The light fraction δ includes all the light fractions that are emitted by the LED 19c of the light source 18 according to FIG. 8a and hit the inner wall 40 of the luminaire housing 39, without having previously been reflected by the reflector 21 and without having previously passed through the collimator optics 20 and been refracted or fully reflected therein.

[0206] These light fractions δ are undesirable and can in particular generate glare effects due to their reflection out of the inner circumferential surface 40.

[0207] To eliminate these light fractions δ, one embodiment of the invention proposes a collar-like portion 59, which is shown in FIG. 8b. In this embodiment example, the collar-like portion is shown in hachure to aid clarity. However, said collar-like portion is in particular connected to the collimator optics 20 in one piece and in an integrally bonded manner, e.g. is molded thereto. The hachure is merely there to illustrate that the light beams (indicated by reference numerals 81a, 81b as marginal rays of the light fraction δ) cannot always pass through the collar-like portion unrefracted or unimpeded.

[0208] The embodiment example in FIG. 9 has the same purpose, i.e. to eliminate said undesirable light fractions δ: In this case, the collar-like portion 59 is provided by a Fresnel lens portion 60, which also captures these light fractions δ and makes them available for further manipulation by means of total reflection. This further increases the lighting efficiency of the luminaire.

[0209] On the basis of the embodiment examples in FIGS. 10 and 11, a further luminaire according to the invention will now be explained:

[0210] FIG. 10 shows a light drive 74 in a view similar to FIG. 1a.

[0211] Once again, the light drive 74 comprises a light source 18, having three LEDs 19a, 19b, 19c shown by way of example, and a collimator 20, which in this case is identical to the collimator 20 of the embodiment example in FIG. 1a.

[0212] The special feature of the embodiment example in FIG. 10 is that a first reflector 82 and a second reflector 83 are provided.

[0213] The two reflectors 82, 83 are arranged so as to be nested together. This in particular includes a configuration in which the two reflectors 82, 83 are arranged concentrically in relation to their respective optical axes 31.

[0214] The first reflector 82 is arranged at a reflector bypassing distance 84 from the arrangement surface 34 of the light source and/or from the light source 18.

[0215] The first reflector 82 is designed to capture, collect and collimate a pencil of light emitted by the light source 18 at the angle β1, i.e. a light fraction β1. In particular, this light is emitted as a parallel pencil of light after being reflected on the reflector 82.

[0216] The second reflector 83 is designed to capture and collimate a pencil of light emitted by the light source 18 at the space angle β2 and to emit it as a parallel or substantially parallel pencil of light.

[0217] In particular, this embodiment is particularly advantageous when particularly large luminaires, e.g. luminaires having an external diameter of e.g. more than 100 mm or more than 150 mm, are to be manufactured.

[0218] Small collimators 20 can still be used even with these large-dimension luminaires.

[0219] The collimator optics 20 captures and collimates the pencil of light 22 emitted radially on the inside.

[0220] At the same time, a radially outer emitted pencil of light 23 bypasses the collimator optics 20. The light-beam fractions 23 emitted radially outwards are divided into the light fractions β1 and β2, which reach the two reflectors 82, 83.

[0221] The collimator optics 20 can be fastened to the first reflector 82, in particular in the same way as the collimator 20 is fastened to the reflector 21 in the embodiment examples in FIGS. 1 to 9.

[0222] In the embodiment example in FIGS. 10 and 11, the second reflector 83 can additionally form a module together with the first reflector 82. For this purpose, for example, three connecting ribs 85a, 85b, 85c can be provided, which interconnect the two reflectors 82, 83. The light-beam fraction emitted at the space angle β2 can exit the second reflector 83 almost unimpeded due to the large free surfaces 86a, 86b, 86c and the only very narrow ribs 85a, 85b, 85c.

[0223] The invention also covers a configuration in which, alternatively, the first reflector 82 is fastened to the collimator optics 20 and the collimator optics 20 is directly fastened to the second reflector 83.

[0224] FIG. 12 shows an embodiment example of this kind: In this case, the first reflector 82 is inserted, by its upper edge region, into a corresponding retaining opening 87 in the positioning flange 54 of the collimator optics 20, where it is held. In the embodiment example in FIG. 12, the positioning flange 54 is divided into a first portion 54a and a second portion 54b.

[0225] In addition, the invention also covers embodiment examples in which the collimator optics and/or the first reflector 82 and/or the second reflector 83 are directly or indirectly rigidly secured relative to a housing of the luminaire (said housing not being shown in FIGS. 10, 11 and 12).

[0226] On the basis of the embodiment example in FIG. 13, an alternative way of securing the collimator optics 20 and reflector 21 relative to one another will now be explained:

[0227] FIG. 13 schematically indicates a clamping ring 88, which overlaps, by an overlap portion 92, an edge-side so-called “bearing portion” 91 of the collimator optics 20. The bearing portion 91 of the collimator optics 20 rests on the reflector 21 on a bearing surface 89.

[0228] The clamping ring 88 comprises a clamping-ring mount 90, by which the clamping ring 88 is secured on the reflector 21.

[0229] The clamping ring 88 is thus used to secure the collimator optics 20 relative to the reflector 21.

[0230] By way of example, the securing can be achieved by means of spring locks or spring-lug elements, or by means of an annular snap-in connection. However, auxiliary elements such as screws, clips, splints or the like can also be used alternatively or additionally.

[0231] The module comprising the reflector 21, the collimator optics 20 and the clamping ring 88 is secured on the inner wall 40 of the housing 39 by means of the installation portion 66, similarly to the above-described embodiment examples.

[0232] FIG. 14 shows a further alternative embodiment:

[0233] In this case, the clamping ring 88 is provided with a clamping-ring mount 90, which is used directly to secure the module, which comprises the collimator optics 20, the clamping ring 88 and the reflector 21, on the inner wall 40 of the luminaire housing 39.

[0234] In this case too, retaining lugs, spring-clamp elements or similar retaining elements (not shown in FIG. 14) can be provided.

[0235] Alternatively to the view in FIG. 14, in a further embodiment example the clamping ring 88 can also be directly secured on the printed circuit board 65, and a module comprising the clamping ring 88, the collimator optics 20, the reflector 21 and the printed circuit board 65 can be secured on the luminaire housing 39 by means of installation means (not shown in FIG. 14).