Lighting device with light distributor

Abstract

The invention relates to a lighting device, in particular for interior lighting, comprising: a lighting device (3); the light distribution body (1) is provided with a light coupling input surface (11) and a semitransparent light emitting area (12); wherein the light distribution body (1) is substantially spherical and is designed to emit in a directed manner a first portion of the light emitted by the lighting device (3) and introduced into the light distribution body (1) via the light coupling-in surface (11), and to scatter a second portion of the introduced light by means of the light distribution body (1), the light distribution body (1) has a recess (6) in the light distribution body (1) such that light exits substantially in a diffusive manner over the entire light exit region (12) of the light distribution body (1), the light distribution body (1) being solid and the light coupling-in surface (11) being an interface between the recess (6) of the light distribution body (1) and the light distribution body (1).

Description

[0001] The present invention relates to a lighting device having a light distributor according to the subject matter of claim 1.

[0002] Lighting devices with different emission characteristics are known, each suitable for lighting purposes in different application scenarios. Thus, for example, lighting devices with diffused emission characteristics are known. Such lighting devices are suitable for uniformly illuminating large areas. On the other hand, lighting devices designed to emit directional light are known, such as spotlights or floodlights. Using such lighting devices enables targeted illumination of limited spatial areas.

[0003] In many cases, it is desirable to use both emission characteristics simultaneously for illuminating a space, for example, in a working space with workplaces. There, it is desirable to be able to uniformly illuminate the space and at the same time be able to provide enhanced illumination of the workplaces. Similarly, it is generally desirable to combine diffused illumination of the space with directional illumination of specific spatial areas to create a pleasant spatial harmony.

[0004] In the prior art, lamps are known that combine different lighting devices with different emission characteristics to simultaneously produce diffused light and directional light. Thus, for example, DE202016102638U1 discloses a hybrid lamp having at least one LED lighting device for emitting a directional light flux and at least one planar OLED lighting device for emitting a diffused light flux.

[0005] Since hybrid lamps require separate lighting devices to provide different emission characteristics, both the space requirement and the expense of the production process increase.

[0006] Against this background, the object of the present invention is to provide a lighting device suitable for emitting directional light and diffused light. In addition, the present invention aims to provide a lighting device that, although capable of producing directional light and diffused light, is characterized by a simple and compact structure and space savings.

[0007] The object is achieved by a lighting device having the features of claim 1, with advantageous refinements being reflected in the dependent claims.

[0008] The object is achieved in particular by a lighting device, in particular for interior lighting, which comprises a lighting means and a light distributor having a light-coupling input surface and a translucent light output region. In this case, the light distributor is substantially spherical. The light distributor is designed to emit a first portion of the light emitted by the lighting means and introduced into the light distributor via the light-coupling input surface in a directional manner, and to scatter a second portion of the introduced light by means of the light distributor such that the light exits in a diffused manner substantially over the entire light output region of the light distributor. The light distributor is of solid design, wherein the light-coupling input surface is formed at the interface between a recess in the light distributor and the light distributor. In this case, the recess comprises a first portion having the shape of a spherical element, a cone or a flattening, wherein the shape of the first portion can be positive or negative.

[0009] The basic concept of the invention consists in providing a light distributor and constructing it such that a part of the coupled-in light emitted by a (single) lighting means exits the light distributor in a diffused manner and another part in a directional manner. Thus, since only one lighting means and one (relatively compact) light distributor are required, a structurally simple and space-saving construction of a lighting device with two emission characteristics is achieved. In this case, the geometric configuration of the recess (at which the light-coupling input surface is formed) is used to specifically influence the emission characteristics of the light distributor.

[0010] In this case, the light distributor fulfils a dual function. A part (first part) of the light coupled into the light distributor is guided and preferably directed inside the light distributor such that this part of the light exits the light distributor in a directional manner. Preferably, the directional part of the coupled-in light exits via a partial region of the light output region. A part (second part) of the light coupled into the light distributor is scattered or distributed by means of the light distributor such that this part of the coupled-in light is emitted in a diffused manner substantially over the entire light output region, preferably over the entire light output region. In this case, the diffused-emitted light is preferably scattered when exiting from the surface of the light distributor forming the light output region and when internally reflected inside the light distributor. In addition, due to the internal reflection, the light is distributed in the light distributor.

[0011] Thus, due to the scattering of a part (first part) of the coupled-in light, the light distributor produces diffused emission characteristics, and due to the directional emission of another part (second part) of the coupled-in light, the light distributor produces directional emission characteristics. Thus, according to the invention, the light distributor is designed to emit the light coupled in via the light-coupling input surface with emission characteristics representing the superposition of diffused emission characteristics and directional emission characteristics. Advantageously, in this case, no separate lighting means or optical elements for modifying the emission characteristics are required to provide this emission characteristic.

[0012] The lighting device according to the invention has emission characteristics representing a superposition of diffused emission characteristics and directional emission characteristics. Thus, with the lighting device according to the invention, it is possible to uniformly illuminate a space, in particular an interior, using a single lighting device, and at the same time, it is possible to illuminatingly target a limited spatial area using a directional light component.

[0013] In the context of the present invention, diffused light emission or diffused light emission characteristics should be understood to refer to a spatial emission pattern having a substantially constant intensity within a large solid angle range, preferably within a solid angle range of 2π sr (steradian) or more. In contrast, directional light emission or directional light emission characteristics represent a spatial emission pattern in which the emission is restricted to a small solid angle range of less than 2π sr, preferably less than 1 sr. Thus, directional light emission is not limited to collimated light emission, but also includes a conical emission pattern having a small emission angle of preferably 45° or less.

[0014] To ensure the light distribution function within the light distributor, it is also preferred that the light distributor is formed of a transparent material, preferably formed of glass or transparent plastic. According to the invention, the light distributor has a solid design (i.e., without cavities) and is preferably composed substantially entirely of a transparent material.

[0015] With such a light distributor, it is possible to achieve the directional part of the emitted light in a structurally particularly simple manner. A light distributor formed of a solid, substantially spherical body made of a transparent material is particularly preferred. In this configuration, a part of the light introduced into the light distributor is focused by the substantially spherical light distributor. This part of the coupled-in light is emitted from the light distributor in a directional manner via a region of the light-emitting surface of the light distributor that is positioned opposite to the light-coupling input surface. Thus, with a geometrically compact and easily producible light distributor, it is possible to achieve the directional part of the emission of the coupled-in light in a particularly simple manner.

[0016] In this case, it is preferred that the substantially spherical light distributor has a diameter greater than 5 cm, particularly preferably 5 cm to 50 cm.

[0017] The substantially spherical body should be understood to refer to an object whose shape only slightly deviates from a spherical shape. For example, in the context of this specification, an ellipsoid in which the length difference of the semi-axes is substantially less than the length of the shortest semi-axis (preferably, the length difference of the semi-axes does not exceed 10% of the length of the shortest semi-axis) should be understood to be substantially spherical. In this case, a positive or negative expression should be understood to mean that the corresponding geometric figure (spherical element or frustum) is curved inward, that is, is part of a recess (positive expression of the shape), or is curved outward, thus forming part of the light distributor (negative expression of the shape).

[0018] Since the recess receives the largest part of the light wavefront emitted by the light distributor before the light wavefront enters the light distributor, the geometric properties of the first part of the recess are crucial for the beam profile inside the light distributor, because the light-coupling input surface formed at the interface between the recess and the light distributor refracts the coupled-in beam. Since the first part of the recess (and thus the light-coupling input surface) is positioned opposite the region of the light distributor where the directional emission occurs, the geometric configuration of the recess (and thus the light-coupling input surface) has a great influence on the part of the coupled-in radiation that is emitted in a directional manner.

[0019] If the line connecting the center point of the light distributor and the center point of the first part of the first recess is defined as the optical axis, for example, choosing the shape of the first part as a spherical element with a positive formulation causes the incident beam to refract away from the optical axis. This results in a reduction in the part of the radiation that is emitted in a directional manner relative to the part of the radiation that is diffusely emitted. In contrast, constructing the shape of the first part as a spherical element with a negative formulation causes the incident beam to refract towards the optical axis, whereby the part of the radiation that is emitted in a directional manner increases.

[0020] If a cone (with a positive or negative formulation) is chosen instead of a spherical element as the shape of the first part, a similar effect will occur, although in different quantities.

[0021] In a preferred exemplary embodiment, the recess further includes a second part that is shaft-shaped or substantially cylindrical, wherein the first part is provided at the end of the surface of the second part facing away from the light distributor. In other words, preferably, the second part of the recess, which is shaft-shaped or substantially cylindrical in design, extends from the surface of the light distributor into its interior, and the first part of the recess is provided at the inner end of the second part. The second part of the light-coupling input surface is formed at the interface between the second part of the recess and the light distributor (that is, the lateral surface of the shaft-shaped or substantially cylindrical second part of the recess). In this case, the light-coupling input surface thus consists of two parts: a first part that is formed at the interface between the first part of the recess and the light distributor; and a second part that is formed at the interface between the second part of the recess and the light distributor. Particularly preferably, the longitudinal axis of the second part of the recess extends substantially in the radial direction of the light distributor.

[0022] In this case, a recess that extends substantially linearly in the longitudinal direction should be understood as shaft-shaped, where the cross-section does not necessarily have to be constant.

[0023] An advantage resulting from the configuration of the recess with the second part is that, before the radiation passes through the part of the light-coupling input surface formed at the first part of the recess, the radiation emitted by the lighting device is first "guided" in part within the light-distributing body by reflection at the lateral surface of the second part of the recess.

[0024] At the same time, by correspondingly selecting the depth of the second part of the recess, it is possible to control which part of the radiation initially emitted by the lighting device has been emitted into the light-distributing body, and the remaining part of the subsequently emitted radiation enters the first part via that part of the light-coupling input surface formed at the first part of the recess.

[0025] If the second part is configured to be longer, a larger part of the incident light beam (whose propagation direction does not extend parallel to the extension direction of the second part) is coupled into the light-distributing body via the part of the light-coupling input surface formed by the interface between the second part and the light-distributing body, and thus the part of the radiation emitted in a diffused manner increases.

[0026] According to another preferred embodiment, the surface of the light-coupling input surface is roughened and / or frosted completely and / or partially.

[0027] Due to the targeted roughening or frosting of the light-coupling input surface, the part of the radiation emitted in a diffused manner can also be increased in a simple and effective way, because the reflection at the light-coupling input surface is reduced.

[0028] According to another aspect of the invention, the light-distributing body has reflector elements and / or scattering centers for changing the ratio of the directionally emitted light and the diffused emission of the light-distributing body. Preferably, the reflector elements are formed by a partially reflective layer or a fully reflective layer, which is arranged inside the light-distributing body or at the light-coupling input surface or inside the recess, and fully or partially reflects the incident radiation.

[0029] Due to the reflection of the incident light beam at the reflector elements, the part of the radiation emitted in a directional manner can be further reduced, or can be set specifically by partial reflection. Depending on the angular position of the reflector elements, it is also possible to set which part of the incident light beam enters the light-distributing body at which angle, whereby the directional emission characteristics can be further influenced.

[0030] Due to the introduction of the scattering centers into the light-distributing body, it is possible to additionally increase the part of the radiation emitted in a diffused manner. For example, by means of highly focused laser irradiation, the scattering centers can be introduced into a solid light-distributing body.

[0031] In another preferred embodiment, the recess (associated with the optically coupled input surface) has a recess depth and a recess diameter in the light distribution body, where the recess diameter corresponds to the maximum diameter of the recess at the end of the recess facing the illumination device, where the recess diameter and the recess depth are each less than or equal to the radius of the light distribution body, and where the extent of the recess in a direction orthogonal to the recess depth direction is never greater than the recess diameter.

[0032] In this case, the recess depth consists of the depth of the first part of the recess and, if present, the depth of the second part of the recess. In this case, the recess depth consists of the depth of the first part and, if present, the depth of the second part. In this case, the maximum extent of the recess in the direction extending parallel to the optical axis is the depth. In the case of a recess having a second part with an axis shape or cylindrical shape, the depth extends along the longitudinal axis of the second part of the recess.

[0033] Due to the matching or selection of the ratio between the recess diameter and the recess depth, the emission characteristics of the light distribution body can be further influenced. In this case, a large recess diameter generally results in a larger portion of the radiation being emitted in a diffused form, while a small recess diameter generally results in a larger portion of the radiation being emitted in a directed form. As explained above regarding the depth of the second element, a larger recess depth also results in a larger portion of the radiation being emitted in a diffused form, while a smaller recess depth results in a larger portion of the radiation being emitted in a directed form.

[0034] Furthermore, it is preferred that the recess depth is greater than the recess diameter (D), preferably (at least) twice as large as the recess diameter (D).

[0035] The following embodiments are likewise preferred, where the recess diameter is less than a quarter of the radius of the light distribution body, preferably less than a fifth of the radius of the light distribution body, more preferably less than a tenth of the radius of the light distribution body.

[0036] By choosing a small recess diameter, excessive hollowing out of the solid light distribution body is avoided, and a sufficiently large volume is created in the light distribution body for light propagation and distribution. Thus, the emission characteristics can be advantageously manipulated by means of the construction of the light distribution body.

[0037] According to a preferred embodiment of the present invention, the lighting device includes an optical waveguide, which is designed to guide the light emitted by the lighting means to the light-coupling input surface of the light-distributing body. Therefore, the lighting means can be arranged at a distance from the light-distributing body. This is structurally advantageous. In addition, by means of the optical waveguide, the distance between the lighting means and the light-distributing body can be set purposefully by correspondingly selecting the length of the optical waveguide. This can help to change the emission angle of the directionally emitted light portion. As shown in a plurality of exemplary embodiments described herein, according to the present invention, the light emitted by the lighting means can be guided to the light-coupling input surface of the light-distributing body with or without an optical waveguide.

[0038] Any optical element capable of transmitting light within the optical waveguide between the coupling input surface and the coupling output surface of the optical waveguide can be used as the optical waveguide. For example, an optical waveguide can be used as the optical waveguide. Similarly, an elongated element (such as a cylindrical or prismatic element) made of a transparent material (such as glass or transparent plastic) can be used as the optical waveguide, wherein the light emitted by the lighting means is coupled in via the base surface and coupled out via the base surface at the axially distal end.

[0039] According to another preferred embodiment of the present invention, the light-emitting area of the light-distributing body is formed by a frosted surface. Specifically, the light-emitting area is formed by a frosted surface on the surface of the light-distributing body. Therefore, diffused light emission can be provided over the entire light-emitting area in a particularly simple manner. The frosting of the light-emitting area can be produced in a conventional manner by surface roughening, for example by etching or sandblasting.

[0040] In a preferred embodiment, the light-distributing body is formed by a solid, substantially spherical body made of a transparent material, the surface of which is frosted except for the light-coupling input surface. Due to the spherical shape, a part (the first part) of the coupled-in light is focused and emitted in a directional manner via the surface area of the light-distributing body positioned opposite the light-coupling input surface or the part of the light-emitting area positioned opposite the light-coupling input surface. Another part (the second part) of the coupled-in light is emitted in a diffused manner at the frosted surface of the light-distributing body (i.e., the light-emitting area) and / or is diffusely reflected at the frosted surface inside the light-distributing body and then emitted in a diffused manner via the frosted surface.

[0041] In some examples, for example, only a part of the surface (spherical surface) of the light-distributing body can be frosted (or roughened), as described herein for example.

[0042] The frosted and / or non-frosted areas can be configured such that light exits, for example, substantially via the frosted area. For example, no light can exit via the non-frosted area.

[0043] However, the light emitted in a diffused manner can also (mainly) be emitted at the frosted area of the surface of the light distributor, and can also (partially) be emitted at the non-frosted area.

[0044] In an exemplary embodiment with a (substantially) completely frosted surface of the light distributor, for example (as described herein), the second part of the introduced light is scattered by means of the frosted surface of the light distributor, such that the light is emitted in a diffused manner substantially over the entire (frosted) light-emitting area of the light distributor.

[0045] In an exemplary embodiment where the surface of the light distributor includes a frosted part and a non-frosted part, the second part of the introduced light can be scattered by means of the light distributor, in particular by means of the frosted part of the surface of the light distributor. Therefore, the light can be emitted in a diffused manner substantially over the entire (frosted) light-emitting area of the light distributor (i.e., for example, at the frosted part of the surface and / or in some cases also at the non-frosted part of the surface).

[0046] In particular, in an exemplary embodiment with a non-frosted (e.g., polished) surface of the light distributor, for example (as described herein), a part of the introduced light can be scattered by means of the scattering centers in the interior of the light distributor, such that the light is emitted in a diffused manner substantially (also) via the non-frosted surface. In an example with a completely non-frosted (e.g., polished) surface of the light distributor, a part of the light can thus also be emitted over the entire (non-frosted) light-emitting area of the light distributor. However, examples with a (completely) non-frosted surface are also conceivable.

[0047] Therefore, an illumination device can be formed, which provides a particularly advantageous and aesthetic combination of diffused emission characteristics and directional emission characteristics using only one illumination device, which is particularly simple and inexpensive to produce and has a particularly compact structure. It has surprisingly been found that when using a solid, (substantially) spherical light distributor made of a transparent material with a frosted surface as the light-emitting area, an illumination device is created, in which the intensity of the light part emitted in a diffused manner by the light distributor has a satisfactory high intensity over the entire light-emitting area, which is suitable for uniform and harmonious illumination, while the directional part of the emitted light is bright enough to illuminate a limited spatial area in a point-like manner.

[0048] Furthermore, it is preferred that the light-coupling input surface is formed by a smoothly ground or polished area at the interface between the recess of the light distributor and the light distributor. This contributes to the light-coupling input into the light distributor.

[0049] The lighting device is preferably formed by one or more LEDs and is also preferably designed as an LED cluster or an LED-RGB module. Thus, a lighting device that emits light, saves energy, and is compact can be provided at low manufacturing costs. The lighting device preferably has exactly one lighting device formed by a (single) LED or an LED cluster or an LED module. If an LED-RGB module is used as the lighting device, the color of the light emitted by the lighting device can be set in a variable manner. In this case, due to internal reflection and scattering, the light distribution body causes the colors of the light emitted by the individual LEDs in the LED-RGB module to mix. Thereby, light emission with a uniform color is achieved.

[0050] In a (further) preferred embodiment, the light distribution body has regions with a reflective coating on its surface, and the reflective coating is designed to partially or fully reflect the light that propagates inside the light distribution body and impinges on the reflective coating.

[0051] Due to the local arrangement of the reflective coating, the emission characteristics of the light distribution body can be further modified in a targeted manner. The emission of directional light and / or diffused light can be restricted to, for example, a specific solid angle region, or reduced in a targeted manner in a specific region. When using a convex (especially spherical) light distribution body with a frosted surface, by locally applying a fully reflective coating, the surface regions can be excluded from the light-emitting regions because light does not exit the light distribution body in these regions.

[0052] According to a (further) preferred embodiment, the lighting device includes a holder in which the light distribution body is rotatably mounted about its central point. Thus, by rotating the light distribution body in the holder, the user can simply adjust the direction of the directionally emitted light. In this embodiment, a substantially spherical light distribution body is particularly preferred because it can be rotatably mounted about its central point in a structurally simple manner.

[0053] Furthermore, it is preferred that the lighting device includes a dome that partially or fully surrounds the light distribution body. Thus, the surface of the light distribution body can be protected from contamination and damage. This protection is particularly advantageous in the case of a light distribution body with a frosted surface because contamination of the frosted surface affects the diffusing effect and causes a change in the transmission behavior.

[0054] According to a preferred refinement, the dome has surface regions with different transmittances, which are designed to modify the emission characteristics of the light distribution body. Preferably, at least one surface region has a partially reflective coating and / or a fully reflective coating. According to this refinement, the emission characteristics of the lighting device can be modified by the corresponding design of the dome without having to change the light distribution body. Thus, appropriate emission characteristics of the lighting device can be achieved according to the application. In addition, an aesthetically favorable construction of the lighting device can be achieved.

[0055] More details, features, and advantages of the present invention are described in more detail below with reference to the accompanying drawings. The features and combinations of features shown and described below with reference to the accompanying drawings can be used not only in the respective specified combinations but also in other combinations without departing from the scope of the present invention.

[0056] In this document:

[0057] Figure 1 A perspective exploded view of a lighting device having a light distributor according to an exemplary embodiment of the present invention is shown;

[0058] Figure 2 Is shown in a sectional view Figure 1 of the exploded view of the lighting device;

[0059] Figure 3 Is shown Figure 1 a sectional view of the lighting device in an assembled state;

[0060] Figure 3a A diagram showing a first exemplary embodiment of a light distributor, in which the frosted surface forming the light-emitting area of the light distributor includes only a part of the surface of the light distributor;

[0061] Figure 3b A diagram showing a second exemplary embodiment of a light distributor, in which the frosted surface forming the light-emitting area of the light distributor includes only a part of the surface of the light distributor;

[0062] Figure 3c A diagram showing a third exemplary embodiment of a light distributor, in which the frosted surface forming the light-emitting area of the light distributor includes only a part of the surface of the light distributor;

[0063] Figure 3d A diagram showing a fourth exemplary embodiment of a light distributor, in which the frosted surface forming the light-emitting area of the light distributor includes only a part of the surface of the light distributor;

[0064] Figure 3e Is shown Figure 1 a sectional view of the lighting device in an assembled state, the lighting device having a planar light-coupling input surface;

[0065] Figure 3f Is shown Figure 1 a sectional view of the lighting device in an assembled state, the lighting device having a convex light-coupling input surface;

[0066] Figure 3g Is shown Figure 1Cross-sectional view of the lighting device in the assembled state, the lighting device having a convex light-coupling input surface and a circumferential notch;

[0067] Figure 3h Shows an illustration of a fourth exemplary embodiment having a Figure 3g light distribution body and no light guide;

[0068] Figure 3i Shows an illustration of a fifth exemplary embodiment having a light distribution body with a planar light-coupling input surface and a circumferential notch;

[0069] Figure 4 Shows a schematic diagram of the emission characteristics achievable by the lighting device according to the Figures 1 to 3 exemplary embodiment shown;

[0070] Figure 5 Shows, in a schematic diagram of achievable emission characteristics, an illustration of a Figure 4 variant of the exemplary embodiment shown;

[0071] Figure 6 Shows an illustration of an exemplary embodiment in which the recess consists of only a first part;

[0072] Figure 7 Shows an illustration of an exemplary embodiment in which the recess consists of a first part and a second part;

[0073] Figure 8 Shows another exemplary embodiment in which the first part consists of a flattened portion;

[0074] Figure 9 Shows an exemplary embodiment in which the first part consists of a negative spherical section;

[0075] Figure 10 Shows an exemplary embodiment in which the first part consists of a negative frustum;

[0076] Figure 11 Shows an exemplary embodiment having a reflector element at the light-coupling input surface;

[0077] Figure 12 and Figure 13 Shows exemplary embodiments having different arrangements of scattering centers in the light distribution body;

[0078] Figure 14 Shows an arrangement of reflector elements in the light distribution body;

[0079] Figure 15 Shows a curve that qualitatively represents the Figure 4 and Figure 5 angular dependence of the emission characteristics that the lighting device shown can produce;

[0080] Figure 16 Shows a schematic cross-sectional view of a lighting device having a light distributor according to another preferred exemplary embodiment of the present invention, the lighting device having modified emission characteristics;

[0081] Figure 17 Shows a schematic cross-sectional view of a lighting device having a light distributor according to another preferred exemplary embodiment of the present invention, the lighting device having modified emission characteristics;

[0082] Figure 18 and Figure 19 Shows a schematic cross-sectional view of a lighting device having a light distributor according to another preferred exemplary embodiment of the present invention, the lighting device having a holder for the light distributor;

[0083] Figure 18a and 19a Shows according to Figure 18 and Figure 19 A schematic cross-sectional view of a lighting device, wherein the lighting device does not include an optical waveguide;

[0084] Figure 20 Shows a schematic cross-sectional view of a lighting device having a light distributor according to another preferred exemplary embodiment of the present invention, the lighting device having a dome;

[0085] Figure 21 Shows Figure 20 An illustration of a variant of the exemplary embodiment shown.

[0086] Essentially, the drawings are only schematic and are only used to understand the present invention. In the description of the exemplary embodiments, the same or similar elements are provided with the same reference numerals.

[0087] Figure 1 Shows an exploded perspective view of a lighting device according to a preferred exemplary embodiment of the present invention. The lighting device includes a light distributor 1, an optical waveguide 2, and a lighting device 3 as main components.

[0088] The lighting device 3 is preferably formed by an LED or an LED unit (e.g., an LED cluster or an LED module) composed of a plurality of LEDs, but is not limited thereto. The lighting device 3 is designed to emit light in the direction of the optical waveguide 2 and in the direction of the light distributor connected to the optical waveguide 2.

[0089] The optical waveguide 2 is formed by an elongated, substantially cylindrical body made of a transparent material, the longitudinal axis of which extends along the central axis of the lighting device. At Figure 1In the exploded view, the central axis is shown as a dashed line. At the axial ends, the light guide 2 has a light coupling input surface 21 and a light coupling output surface 22 respectively. The light coupling input surface 21 and the light coupling output surface 22 are preferably surfaces with high transmittance, which can be achieved, for example, by corresponding polishing and / or applying a suitable coating. The lateral surface of the light guide 2 can be provided with a suitable reflective coating to improve the light transmission between the lighting device 3 and the light distributor 1. Alternatively, the lateral surface of the light guide 2 can be provided with an opaque covering. Similarly, the lateral surface of the light guide 2 can also have no specific modification, but is formed by an untreated or unspecially treated surface.

[0090] The light guide 2 is used to guide the light emitted by the lighting device 3 into the light distributor 1. In order to couple the light into the light distributor 1, the light distributor 1 has a light coupling input surface 11. In the assembled state, the light guide 2 is placed on the light coupling input surface 11 with its light coupling output surface 22. This can be seen in Figure 2 and Figure 3 which shows, Figure 2 and Figure 3 a schematic cross-sectional view of the lighting device shown in Figure 1 . The lighting device 3 is placed on the light coupling input surface 21 of the light guide. The light coupling output surface 22 of the light guide 2 is placed on the light coupling input surface 11 of the light distributor 1. Thus, the light emitted by the lighting device 3 is coupled into the light guide 2 through the light coupling input surface 21. Then, the light is guided in the light guide 2 to the light coupling input surface 11 of the light distributor 1. Finally, the light is coupled into the light distributor 1 from the light coupling output surface 22 of the light guide 2 through the light coupling input surface 11 of the light distributor.

[0091] In Figures 1 to 3 the exemplary embodiment shown, the light distributor 1 has a convex shape. Specifically, the shown light distributor 1 is substantially spherical. The shape of the light distributor 1 deviates from the spherical shape only at the light coupling input surface 11. In Figures 1 to 3 the exemplary embodiment shown, the light coupling input surface 11 is formed at a recess of the light distributor 1.

[0092] The light distributor 1 is solid and is formed of a transparent material (such as glass or transparent plastic). Glass is preferred as the material of the light distributor 1. In order to emit the coupled-in light, the light distributor 1 has a light-emitting area 12 on its surface. In Figures 1 to 3 the case of the substantially spherical light distributor shown, the light-emitting area 12 is substantially formed by the entire surface of the light distributor 1 except for the light coupling input surface 11.

[0093] Figures 1 to 3The light-emitting area 12 of the illustrated light distributor is formed by a frosted or satin finish (i.e., a finely roughened surface), at which light is scattered diffusely inside the light distributor 1 and exits the interior of the light distributor 1 in a diffused manner through said surface. In the case where the light distributor 1 is made of glass, such a surface can be obtained, for example, by sandblasting or etching.

[0094] Figures 3a - 3d illustrates different exemplary embodiments of a light distributor 1 according to Figure 3 in which the frosted surface forming the light-emitting area 12 of the light distributor 1 only includes a part of the surface of the light distributor 1: Specifically, for example as described herein, different partial areas of the surface of the light distributor 1 can be frosted: In Figures 3a - 3c example, the frosted part is shown by a surface of a square pattern, and the frosted part increases from Figures 3a to 3c On the one hand, the frosted part of the surface of the light distributor 1 can include, for example, at least a first predetermined share of the surface of the light distributor 1, and / or can be, for example, 25% or more, 50% or more, 75% or more. On the other hand, the frosted part of the surface of the light distributor 1 can include, for example, at most a second predetermined share of the surface of the light distributor 1, and / or can be, for example, 90% or less, 75% or less, 60% or less. However, in Figures 3a - 3c the partial area of the surface of the light distributor 1 that is substantially opposite to the light-coupling input surface 11 is frosted, and in Figure 3d example, the partial area of the surface of the light distributor 1 adjacent to the light-coupling input surface 11 is frosted. Basically, in Figure 3b and 3d example, a similarly large partial area of the surface of the light distributor 1 is frosted. For example, by means of an arrangement as shown in the example of Figure 3d it is possible to increase the emission share of the directional light relative to the light emitted in a diffused manner.

[0095] Preferably, the frosted part of the surface is positioned substantially opposite to the light-coupling input surface 11, for example rotationally symmetric (e.g., as shown in Figures 3a - 3d ). In addition, in other exemplary embodiments, the frosted area can be oriented arbitrarily relative to the light-coupling input surface 11, for example non-rotationally symmetrically.

[0096] The transition between one or more frosted parts and one or more non-frosted parts of the surface of the light distributor 1 can be configured, for example (within the manufacturing accuracy range), directly or include a smooth transition, for example a smooth transition having a width of 1 mm to 10 mm, preferably 2 mm to 5 mm. The boundary of the part of the surface of the light distributor 1 can extend substantially on a circular path (as shown in Figures 3a - 3das shown), or have any other desired profile, such as an angular profile and / or a curved profile.

[0097] Figures 3e - 3h shows an embodiment of the light-coupling input surface 11 that is different from the Figure 3 embodiment shown: Specifically, Figure 3e shows a cross-sectional view of a lighting device having a planar light-coupling input surface 11, Figure 3f shows a cross-sectional view of a lighting device having a convex light-coupling input surface 11, Figure 3g and Figure 3h shows a cross-sectional view of a lighting device having a convex light-coupling input surface 11 and a circumferential notch (shown in this example by a right-angled notch extending circularly around the light-coupling input surface 11). For example, as Figure 3g shown, the notch can be configured to attach the light-distributing body 1 to another device (such as a light guide 2 and / or a support extending around the notch). The support and the light-distributing body can be configured such that they can be releasably connected to each other by means of a threaded connection. For example, for this purpose, the cylindrical extension formed by the notch can be provided with an external thread. For example, the support can be connected to other elements of the lighting device, such as a light source.

[0098] Figure 3h and Figure 3i shows a diagram of an exemplary embodiment having a light-distributing body 1 and no light guide 2. In principle, all the embodiments described herein can be implemented with a light guide 2 (such as Figures 3e - 3g shown) or without a light guide 2 (such as Figure 3h and Figure 3i shown). In this case, Figure 3h shows a diagram of a fourth exemplary embodiment having a Figure 3g light-distributing body 1 and no light guide 2. Figure 3i shows a diagram of a fifth exemplary embodiment having a light-distributing body 1 that has a planar light-coupling input surface 11 and a circumferential notch.

[0099] With the lighting device according to the Figures 1 to 3 exemplary embodiment shown, it is possible to produce emission characteristics that include a directional part and a diffused part. This is described below with reference to Figure 4 , Figure 5 and Figure 15 .

[0100] Figure 4 is a diagram of the emission characteristics that can be achieved by the lighting device according to Figures 1 to 3 . Figure 5 shows Figures 1 to 3A variant of the exemplary embodiment shown without the light guide 2 can also be used to obtain emission characteristics with a directed part and a diffused part.

[0101] First, the emission characteristics of the lighting device are explained with a configuration according to Figure 4 The light emitted by the lighting device 3 is guided into the light distribution body 1 via the light guide 2. An example light beam path passing through the light guide 2 is schematically shown by the arrows in the light guide 2. The lighting device 3 does not emit collimated light but emits light within a specific angular range. In this case, reflection can also occur on the inner wall of the light guide 2. Therefore, the light coupled into the light distribution body 1 from the light guide 2 enters the light distribution body 1 at different angles.

[0102] Since the light distribution body 1 is solidly formed of a transparent material, the light coupled in at an angle small enough with respect to the central axis (shown by a dashed line) of the lighting device enters the first part of the light distribution body 1 and is partially collimated or directed. This part (the first part) of the coupled-in light exits the light distribution body 1 in a directed manner in the area of the light exit region 12 that is positioned opposite the light coupling input surface 11. This is shown by the solid arrows at the upper end of the light distribution body 1 in Figure 4 which represent the directed part of the emitted light.

[0103] The second part of the coupled-in light (i.e., the light that basically does not exit in a directed manner in the area of the light exit region 12 that is positioned opposite the light coupling input surface 11) exits the light distribution body in a diffused manner over the entire light exit region 12. As conceptually shown by the small dashed arrows inside the light distribution body 1 in Figure 4 the part of the light that is incident on the frosted surface from the inside is diffusely reflected back into the interior of the light distribution body 1. Therefore, the second part of the coupled-in light is evenly distributed on the light distribution body 1 and exits in a diffused manner basically over the entire light exit region 12 of the light distribution body 1. This is shown by the dashed arrows on the surface of the light distribution body 1 in Figure 4 which represent the diffused part of the emitted light. Due to the frosted surface, additional scattering occurs when the light exits from the light exit region 12.

[0104] In Figure 5 the exemplary embodiment shown, there is no light guide 2. Here, the light emitted by the lighting device 3 is directly coupled into the light distribution body 1 via the light coupling input surface 11. However, the generation of the directed light and the diffused light is basically the same as in Figure 4The illustration is similar to the foregoing embodiments. Correspondingly, a part (the first part) of the coupled input light is directed by the collimation effect of the solid light distributor 1 and is emitted in a directed manner via the part of the light output area 12 that is positioned opposite to the light coupling input surface 11. A part (the second part) of the coupled input light (basically the part that is not emitted from the light distributor 1 in a directed manner) is distributed on the light distributor 1 by internal reflection at the frosted surface and is emitted in a diffused manner through the frosted surface substantially over the entire light output area 12.

[0105] The emission characteristics achievable using the lighting device according to the invention (in particular Figure 4 , Figure 5 the lighting device shown) are formed by the superposition of a diffused part and a directed part. This is schematically shown in the Figure 15 curve. The polar angle θ of the spherical coordinate system with the center point of the light distributor 1 as the origin is shown on the x-axis. A value of 0° represents the direction away from the light coupling input surface 11 along the central axis of the lighting device. The intensity of the light emitted at the corresponding angle θ is on the y-axis, and no specific unit is specified.

[0106] The part (the first part) of the emitted light that forms the directed part is emitted via the area of the light output area 12 that is positioned opposite to the coupling input surface 11. This directed light emission is represented in the Figure 15 by an increasing emission intensity for small θ values. The part (the second part) of the emitted light that forms the diffused part is emitted in a diffused manner substantially over the entire light output area 12 and is presented as a constant background in the Figure 15 curve.

[0107] Overall, therefore, the lighting device according to the invention produces emission characteristics, where the directed part is used for targeted illumination of a limited spatial area, and the diffused part is used for uniform illumination of a larger spatial area. In other words, the lighting device according to the invention is suitable for producing spot illumination with a very soft spot that blends into the diffused illumination part that is emitted over almost the entire solid angle. Surprisingly, in this case, the intensity of the diffused part is very high, such that the diffused part allows for coordinated uniform illumination. At the same time, the intensity of the directed part is very high, such that the directed part produces a significantly brighter and softer spot with which a limited spatial area can be illuminated in a targeted manner.

[0108] The lighting device according to the invention emits directed light and diffused light from the light distributor 1, and for this purpose only a single lighting device 3 is required. In addition, only one compact optical element is needed to produce the emission characteristics with a directed part and a diffused part. The light distributor 1 produces a directed part of the emitted light within a limited solid angle range and a diffused part of the emitted light that is emitted over a very large solid angle range from the coupled input light.

[0109] By simply modifying the light distribution body 1, it is possible to change the reference Figure 4 , Figure 5 and Figure 15 described emission characteristics in a suitable manner according to the lighting requirements. For example, if it is desired not to emit light within a specific solid angle range, the corresponding regions of the surface of the light distribution body 1 can be excluded from the light exit region 12 by applying a covering or a fully reflective reflective coating. In this case, a reflective coating is preferably used because the luminous efficiency can thereby be increased. In addition, the light reflected at the reflective coating inside the light distribution body 1 can be emitted from the light distribution body 1 via the light exit region 12.

[0110] Figure 6 FIG. shows an exemplary embodiment of the light distribution body 1 having a light exit region 12 according to the present invention. In Figures 4 to 14 , the dash-dotted line shows the axis of rotational symmetry of the light distribution body 1. In accordance with Figure 6 the exemplary embodiment of, the recess 6 (which forms the light coupling input surface 11 at the interface with the light distribution body 1) consists only of a first part 61. The first part 61 is formed here by a positive spherical section. Due to this configuration of the first part 61, the incident light is refracted such that the previously parallel extending light beam diverges when entering the light distribution body 1. Therefore, the portion of the light emitted in a directed manner is reduced. In Figure 6 , the recess depth T and the recess diameter D of the recess 6 are denoted by the corresponding reference numerals and are derived from the dimensions of the recess 6 (which consists only of the first part 61 in this exemplary embodiment).

[0111] Figure 7 FIG. shows another exemplary embodiment of the light distribution body 1 having a light exit region 12 according to the present invention. In this exemplary embodiment, the recess 6 (which forms the light coupling input surface 11 at the interface with the light distribution body 1) consists of a first part 61 and a second part 62. The recess depth T consists of the depth of the first part 61 and the depth of the second part 62. The recess diameter D is derived from the dimensions of the second part 62. The first part 61 is also formed here by a positive spherical section. Therefore, since the light beam that does not extend exactly parallel to the optical axis has been able to enter the light distribution body 1 via the part of the light coupling input surface 11 adjacent to the second part 62, in the emission characteristics, the portion of the radiation emitted in a diffuse manner increases again. In the exemplary embodiment shown here, the recess depth T exactly corresponds to the radius of the light distribution body 1. The shown recess diameter D is significantly smaller than the radius of the light distribution body 1 in this case. In the shown embodiment, the recess diameter D exactly corresponds to one-third of the radius of the light distribution body 1. Figure 8Another exemplary embodiment of the light distributor 1 with a light-coupling input surface 11 and a light output region 12 is shown, wherein the first part is formed by a flattened portion and thus has substantially no depth. In this case, the recess depth T is substantially defined by the second part 62 of the recess 6. Since the first part 61 is configured as a flattened portion, the light beam extending parallel to the optical axis is not refracted when entering the light distributor 1, which increases the portion of the radiation emitted in a directional manner. It can be seen here that the recess diameter D is substantially half the size of the recess depth T. In this case, the recess radius D exactly corresponds to one third of the radius of the light distributor.

[0112] Figure 9 Another exemplary embodiment of the light distributor 1 with a light output region 12 is shown. In this exemplary embodiment, the recess 6 (the interface of the recess with the light distributor 1 forms the light-coupling input surface 11) consists of a first part 61 and a second part 62. The recess depth T is thus composed of the depth of the first part 61 and the depth of the second part 62. The recess diameter D is thus produced by the size of the second part 62. The exemplary embodiment shown is largely similar to Figure 7 the embodiment in [reference], but here the first part 61 is formed by a negative spherical section. Thus, the part of the light-coupling input surface 11 formed at the interface between the light distributor 1 and the first part 61 of the recess acts on the incident light beam in a collimated manner, and thus the portion of the radiation emitted in a directional manner increases. The first part 61 of the recess 6 is formed by a region adjacent to the negative spherical section.

[0113] Figure 10 Another exemplary embodiment of the light distributor 1 with a light output region 12 is shown. In this exemplary embodiment, the recess 6 (the interface of the recess with the light distributor 1 forms the light-coupling input surface 11) consists of a first part 61 and a second part 62. The exemplary embodiment shown is largely similar to Figures 7 to 9 the embodiment in [reference], but here the first part 61 is formed by a negative conical section. Thus, the light-coupling input surface 11 acts similarly to the action described with reference to Figure 9 . Thus, in this exemplary embodiment, the portion of the radiation emitted in a directional manner also increases.

[0114] Figure 11 is Figure 10 Another modification of the exemplary embodiment shown. Here, a reflector element 14 is also mounted on the light-coupling input surface as an additional feature. The incident light beam is laterally reflected back by the reflector element 14, which reduces the portion of the radiation emitted in a directional manner. This portion can be set by changing the transmittance of the reflector element 14.

[0115] Figure 12 shows Figure 6Modifications of the exemplary embodiments shown, in which scattering centers 15 are introduced into the light distributor in a semi-circular pattern to affect the emission characteristics over a larger angular range. Figure 13 Another exemplary embodiment is shown, in which a different distribution of the scattering centers 15 is selected. The scattering centers 15 cause the light to be diffusely distributed in the light distributor 1 and increase the portion of the radiation that exits in a diffuse manner.

[0116] In particular, in the exemplary embodiment in which the scattering centers 15 are located in the light distributor, the surface of the light distributor 1 can be completely or at least partially non-matte.

[0117] Figure 14 Exemplary embodiment 6 is shown, in which a reflector element 14 is introduced into the body of the light distributor 1 to reduce the portion of the light that exits in a directed manner. The reflector element 14 can be designed to be partially reflective or fully reflective depending on the intensity of the radiation to be emitted in a directed manner.

[0118] Figure 16 and 17 Two schematic views of a lighting device with a light distributor 1 having corresponding modifications are shown. Figure 16 and 17 The light distributor 1 in [[ ]] is locally provided with a reflective coating 13. In the region of the reflective coating 13, light cannot exit the light distributor 1. Therefore, the region 13 with the reflective coating does not form part of the light exit region 12.

[0119] In [[ ]] Figure 16 In the configuration shown, the region of the surface of the light distributor opposite the light coupling input surface 11 is provided with a reflective coating 13. With this configuration, the portion of the directed light is greatly suppressed. The remaining light exit region 12 essentially emits diffuse light that is partially reflected at the reflective coating 13 within the light distributor.

[0120] In [[ ]] Figure 17 In the configuration shown, a reflective coating 13 is applied to an annular region of the surface of the light distributor 1. With this configuration, a superposition of directed light and diffuse light is emitted in the region of the light exit region 12 that is positioned opposite the light coupling input surface 11. Another part of the light exit region 12 is adjacent to the light coupling input surface 11 and is used to emit diffuse light. Between the two parts of the light exit region 12, a non-emitting region is formed using the reflective coating 13.

[0121] Instead of the reflective coating 13, a colored portion can also be locally provided on the surface of the light distributor 1 or a coating with a reduced transmittance can be provided. Figure 16 and Figure 17 The exemplary embodiments shown with modified emission characteristics can also be combined with Figure 5 the configuration of the lighting device without the light guide 2 shown in [[ ]].

[0122] When using a substantially spherical light distributor 1, the part of the light that is coupled into the light distributor 1 and emitted in a directional manner is emitted via a surface region that is positioned opposite to the light-coupling input surface 11. In order to be able to set the direction of the directional light part, the lighting device can be held in a movable manner. In this case, it is particularly preferred that the lighting device is held such that the light distributor 1 is rotatably mounted about its central point. By such a mounting, it is possible to change the direction of the directionally emitted light without changing the absolute position of the light distributor 1 by rotating the light distributor 1.

[0123] This is shown in Figure 18 and 19 According to this exemplary embodiment, the lighting device is mounted in a schematically shown holder 4 such that the light distributor 1 is rotatable about its central point. In the Figure 18 shown position, the directional light part emitted by the lighting device is emitted vertically upwards. As Figure 19 shown, if the light distributor 1 is rotated in the holder, the direction of the directionally emitted light changes. However, the position of the light distributor 1 remains unchanged. Thereby, a lighting device with small space requirements can be created, the emission characteristics of which have a diffused part and a directional part, wherein the emission direction of the directional part is adjustable.

[0124] Figure 18 and 19 The construction with the holder shown in Figure 5 can be combined with the construction without the light guide 2 shown in Figure 16 and 17 and can be combined with a light distributor 1 with modified emission characteristics according to the exemplary embodiment described with reference to

[0125] Figure 18a and 19a show similar schematic cross-sectional views of the lighting device, in which the lighting device does not include a light guide. This is used to illustrate that even an exemplary embodiment with a rotatably mounted light distributor can be implemented with or without the light guide 2.

[0126] To protect the light distributor 1, in particular the frosted surface of the light distributor 1, from contamination and damage, the lighting device can include a (transparent) dome that at least partially surrounds the light distributor 1. Such a construction is shown in Figure 20 In addition to the light distributor 1, the light guide 2 and the lighting device 3, the lighting device also includes a dome 5 that surrounds the light distributor 1. To improve the overall aesthetic impression, in this exemplary embodiment, it is preferred that the lateral surface of the light guide 2 is provided with an opaque covering or coating (not shown). Thus, the visibility of the light guide 2 is reduced, such that an optical impression is created that the light distributor 1 is floating inside the dome 5.

[0127] To modify the emission characteristics of the lighting device according to Figure 20 the dome 5 can be partially provided with a coating having a reduced transmittance. This is schematically shown in Figure 21 . The dome 5 has a first (partial) reflection coating 51 in the upper region and a second (partial) reflection coating 52 in an annular region surrounding the upper region. The transmittances of the coatings 51, 52 are different from each other. A coating with a transmittance of 0, i.e., a fully reflective coating, or a partially reflective coating with a transmittance between 0 and 1 can be used. Similarly, local coloring of the dome 5 can be used to modify the emission characteristics of the lighting device.

[0128] If in the exemplary embodiment shown in Figure 21 the first coating 51 is implemented as a fully reflective coating and the second coating 52 is implemented as a partially reflective coating, then the directed part of the light emitted by the light distributor 1 is substantially completely reflected at the first coating 51. The part diffusely emitted by the light distributor 1 exits through the region of the second coating 52, and the intensity of this part is reduced by the second coating 52. Thus, a glare-free lighting device with diffuse emission characteristics over a limited spatial region is created.

[0129] Figure 21 The configurations of the coatings 51, 52 shown in

[0130] are only exemplary. It is obvious to a person skilled in the art that any desired combination and arrangement of coatings and / or colored regions on the dome 5 can be used to achieve the desired modification of the emission characteristics of the lighting device. In addition, the dome 5 can be constructed in a detachable and replaceable manner. Thus, the emission characteristics of the lighting device can be modified by simply replacing the dome 5 with a dome having a different coating and / or coloring configuration, without the need to modify or change the light distributor 1 or the lighting device 3. Figure 20 and Figure 21 It is obvious to a person skilled in the art that the exemplary embodiment with the dome 5 shown in

[0131] List of reference numerals:

[0132] 1 Light distributor

[0133] 11 Light coupling input surface

[0134] 12 Light output region

[0135] 13 Reflection coating

[0136] 14 Reflector element

[0137] 15 Scattering center

[0138] 2 Optical waveguide

[0139] 21 (Second) optical coupling input surface

[0140] 22 Optical coupling output surface

[0141] 3 Lighting device

[0142] 4 Holder

[0143] 5 Dome

[0144] 51 First (partial) reflective coating

[0145] 52 Second (partial) reflective coating

[0146] 6 Recess

[0147] 61 First part of the recess

[0148] 62 Second part of the recess

[0149] T Recess depth

[0150] D Recess diameter

Claims

1. A lighting device, in particular a lighting device for interior lighting, comprising: a lighting device (3); a light distribution body (1) having a light-coupling input surface (11) and a translucent light-emitting area (12); wherein the light distribution body (1) is substantially spherical and is designed to emit a first part of the light emitted by the lighting device (3) and introduced into the light distribution body (1) via the light-coupling input surface (11) in a directional manner, and is designed to scatter the introduced light by means of the light distribution body (1) such that the light exits in a diffused manner substantially over the entire light-emitting area (12) of the light distribution body (1), wherein the light distribution body (1) is of solid design, and wherein the light-coupling input surface (11) is the interface between a recess (6) of the light distribution body (1) and the light distribution body (1).

2. The lighting device according to claim 1, wherein, The recess (6) comprises a first part (61) which preferably has the shape of a spherical element, a cone or a flattened part, wherein the shape can be positive or negative.

3. The lighting device according to claim 1 or 2, wherein, The recess (6) comprises a second part (62) which is shaft-shaped or substantially cylindrical, wherein the first part (61) is provided at the end of the second part (62) facing away from the lighting device (3).

4. The lighting device according to any one of the preceding claims, wherein, The surface of the light-coupling input surface (11) is completely and / or partially roughened and / or frosted.

5. The lighting device according to any one of the preceding claims, comprising: a reflector element (14) for changing the ratio of the directional emission and the diffused emission of the light distribution body (1), wherein the reflector element (14) is formed by a partially reflective layer or a fully reflective layer, the partially reflective layer or the fully reflective layer being provided inside the light distribution body (1) or at the light-coupling input surface (11); and / or a scattering center (15) for changing the ratio of the directional emission and the diffused emission of the light distribution body (1), wherein the scattering center (15) is formed inside the light distribution body (1).

6. The lighting device according to any one of the preceding claims, wherein, The recess (6) has a recess depth (T) and a recess diameter (D) in the light distribution body (1), wherein the recess diameter (D) corresponds to the maximum diameter of the recess (6) at the end of the recess (6) facing the lighting device, and wherein the recess diameter (D) and the recess depth (T) are each less than or equal to the radius of the light distribution body.

7. The lighting device according to any one of the preceding claims, wherein, The recess depth (T) is greater than the recess diameter (D), preferably twice as large as the recess diameter (D).

8. The lighting device according to any one of the preceding claims, wherein, The recess diameter (D) is less than one third of the radius of the light distribution body (1), preferably less than one quarter of the radius of the light distribution body (1), more preferably less than one fifth of the radius of the light distribution body (1), more preferably less than one tenth of the radius of the light distribution body (1).

9. The lighting device according to any one of the preceding claims, comprising a light guide (2) designed to guide the light emitted by the lighting means (3) to the light-coupling input surface (11) of the light-distributing body (1).

10. The lighting device according to any one of the preceding claims, wherein, The light-emitting area (12) of the light-distributing body (1) is formed by a frosted surface.

11. The lighting device according to any one of the preceding claims, wherein, The light-coupling input surface (11) is formed by a smoothly ground or polished area on the surface of the light-distributing body (1).

12. The lighting device according to any one of the preceding claims, wherein, The lighting means (3) is formed by one or more LEDs and is preferably designed as an LED cluster or an LED-RGB module.

13. The lighting device according to any one of the preceding claims, wherein, The light-distributing body (1) has an area with a reflective coating (13) on its surface, the reflective coating being designed to partially or fully reflect the light propagating inside the light-distributing body (1) and impinging on the reflective coating (13).

14. The lighting device according to any one of the preceding claims, comprising a holder (4) in which the light-distributing body (1) is rotatably mounted about its central point.

15. The lighting device according to any one of the preceding claims, comprising a dome (5) surrounding the light distribution body (1), wherein, The dome (5) preferably has surface areas (51, 52) with different transmittances, the surface areas preferably having a partially reflective coating and being designed to modify the emission characteristics of the light-distributing body (1).

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