Light emitting device

Abstract

The utility model relates to a light-emitting device (100), in particular for illuminating an interior space, comprising: a light distribution body (110); a pivoting element (120) connected to the light distribution body at a first side of the light distribution body; a holding element (130), the pivot element being pivotally connected to the holding element such that a pivoting of the pivot element relative to the holding element results in a rotation (R1, R2) of the light distribution body without otherwise substantially moving the light distribution body in space.

Description

Technical Field

[0001] The utility model relates to a light-emitting device. Background Art

[0002] Lighting devices with different emission characteristics are known, which are respectively suitable for lighting purposes in different applications. For example, lighting devices with diffuse emission characteristics are known. Such lighting devices are suitable for uniformly illuminating large areas of space. On the other hand, lighting devices designed to emit directional light (for example, spotlights or spotlights) are known. With such lighting devices, limited spatial areas can be illuminated in a targeted manner.

[0003] In many cases, it is desirable to use both emission characteristics to illuminate a space, such as a workspace with workstations. In this case, it is desirable to be able to illuminate the space evenly while providing enhanced illumination of the workstations. It is also often desirable to combine diffuse illumination of the space with directional illumination of specific areas of the space to create a pleasant spatial ambience.

[0004] In the prior art, various luminaires are known that combine different light emitting devices with different emission characteristics for simultaneously generating diffuse light and directional light. For example, DE 20 2016 102 638 U1 discloses a hybrid luminaire having at least one LED light emitting device for emitting a directional light flux and at least one planar OLED light emitting device for emitting a diffuse light flux. Since hybrid luminaires require separate light emitting devices to provide different emission characteristics, the space requirements and manufacturing costs are increased.

[0005] In this context, there is a need for an improved light emitting device which is suitable for emitting both directional and diffuse light. In particular, a light emitting device should be provided which is configured to generate both directional and diffuse light but is characterized by a simple, compact, space-saving structure.

[0006] Furthermore, it is desirable to provide a lighting device that can emit directional and / or diffuse light, wherein the lighting direction can be adjusted. In principle, various possibilities for providing a pivotable luminaire are known. However, these possibilities usually require moving a relatively large luminaire body in space in order to adjust the lighting, which on the one hand affects the appearance of the luminaire and on the other hand requires a correspondingly large installation space in order to be able to move it in space. Therefore, there is a need for an improved lighting device, wherein the lighting direction can be adjusted. Utility Model Content

[0007] Various aspects described herein address, at least in part, one or more of these needs.

[0008] A first aspect relates to a lighting device, in particular a lighting device for illuminating an interior space. The lighting device may have a light distributing body and a pivot element, wherein the pivot element is connected to the light distributing body at a first side of the light distributing body. Furthermore, the lighting device may have a retaining element, wherein the pivot element is pivotably connected to the retaining element, so that pivoting of the pivot element relative to the retaining element causes a rotation of the light distributing body without otherwise substantially moving the light distributing body in space.

[0009] Thus, a light distributing body, which can define an emission characteristic (e.g. an emission direction), can be rotated essentially in a fixed position. As a result, the emission characteristic (e.g. an emission direction) can be changed without requiring additional structural space for moving the light distributing body. Thus, the light distributing body can be accommodated relatively compactly. Furthermore, the optical interaction of the light emitting device and its light distributing body always occurs uniformly without being displaced relative to one another. The connection between the light distributing body and the pivoting element can, for example, be fixed in position and rotationally fixed.

[0010] The holding element can be designed in an at least partially circular arc and / or spherical shell-shaped manner. Thus, for example, a section of the pivoting element can be guided along the holding element so that the section at least partially undergoes a circular arc and / or spherical shell-shaped movement during the pivoting. Thus, by pivoting the pivoting element to another position, a rotational movement around the center of the corresponding circular arc and / or spherical shell-shaped section of the holding element is caused. Accordingly, the light distributing body placed there can be rotated by pivoting the pivoting element.

[0011] The holding element may have a recess through which the pivot element at least partially extends and along which the pivot element can pivot. A safe, repeatable pivoting movement can thus be achieved. For example, the pivot element may be connected to the holding element in a clamping manner at one or more edges of the recess so that the pivot element can slide along the recess. For example, the recess is designed such that a circular arc movement of the pivot element can, for example, be performed substantially in a plane.

[0012] In some examples, the rotation of the light distributing body may be performed around the center of gravity and / or the center of the light distributing body. Thus, it is possible to ensure that the light distributing body rotates as purely as possible without substantially moving the light distributing body in space.

[0013] The light distributing body can be designed in a substantially spherical manner. This achieves that when the light-emitting device is rotated, the appearance of the light-emitting device from the outside of the light-emitting device does not change in any way. This also makes it possible to simultaneously achieve a small installation space for the light distributing body. In particular, when directional light is at least partially emitted by the light distributing body (as described in detail herein), the lighting direction can be adjusted in a space-saving manner without having to change the configuration of the light-emitting device from the outside as required.

[0014] The light distributing body and the holding element can be designed at least partially to be substantially concentric. This can be achieved in a structurally advantageous manner: by pivoting the pivot element along the holding element, a rotation of the light distributing body that is as pure as possible is achieved.

[0015] In some examples, a second side of the light distributing body opposite to the first side of the light distributing body may be free of a pivoting element. The second side may be configured as a light exit area. Therefore, light can be emitted there undisturbed, and the light exit is substantially uninterrupted by the pivoting element.

[0016] For example, the light exit area can be designed, for example, in a substantially spherical manner. Preferably, the light exit area spans a spatial angle greater than 2π. A complete sphere then spans a spatial angle of 4π. The various aspects described herein enable, in particular, the light exit area to be formed, for example, in a hemispherical shape or even beyond a hemispherical shape, thereby spanning a spatial angle greater than 2π.

[0017] The light distributing body may have a light coupling-in surface. In some examples, the pivot element may be designed such that the pivot element at least partially surrounds the light coupling-in surface. Thus, a structurally simple connection between the light distributing body and the pivot element is possible while allowing undisturbed coupling of light into the light distributing body.

[0018] The light distributing body may have a light exit area, which may be configured to emit a first portion of the light emitted by the light emitting device and introduced into the light distributing body via the light coupling input surface as directional light. In addition, the light exit area may be configured such that the light exit area scatters the second portion of the light introduced by means of the light distributing body, so that the light is emitted in a diffuse manner substantially over the entire light exit area of ​​the light distributing body. Therefore, a combination of directional lighting and diffuse lighting is feasible. By means of the rotation of the light distributing body, the direction of the directional light can be adjusted in particular without substantially moving the light distributing body.

[0019] The pivoting of the pivoting element can be arranged to be rotatable so that the pivoting spans the pivoting plane. In addition, the light distributing body can be arranged to be rotatable about an axis located in the pivoting plane by substantially 180°, preferably substantially 360°. For example, the direction of the directional light can be changed not only in the pivoting plane, but also by rotating the light distributing body about an axis in the pivoting plane by 180° or even 360°. Thus, the direction can be adjusted arbitrarily within a circular area.

[0020] The light emitting device can be arranged so that by rotating and / or pivoting the light distributing body, directional light can be emitted at any position over a spatial angle of at least π / 2, 0.75π, π, 1.25π or 1.5π. For example, the direction of the directional light can be changed from a central direction around a central direction in a rotationally symmetrical cone, wherein the cone has an opening angle of at least 30°, 40°, 50°, 60°, 70°, 80°, 90°, 120°, 150°, 170°.

[0021] The light distributing body can be designed in a substantially solid manner.

[0022] The pivot element can have a light emitting device, a heat sink and / or a shade. The arrangement of the above-mentioned elements on the pivot element allows a particularly compact design. In particular, a shade can be provided to shield a first side of the light distributing body so that essentially only a second side of the light distributing body of the light emitting device is visible to the outside. Thus, the pivoting movement of the pivot element can be concealed so that the pivot element is not visible to the outside, so that, for example, the direction of the directional light can be adjusted within a wide range without it being visible to the outside on the appearance of the light emitting device.

[0023] A second aspect relates to a lighting device, in particular a lighting device for illuminating an interior space, comprising a lighting device, a light distributing body having a light coupling-in surface and a translucent light exit area. Here, the light distributing body is substantially spherical. The light distributing body is configured to emit a first portion of the light emitted by the lighting device and introduced into the light distributing body via the light coupling-in surface as directional light, and to scatter a second portion of the introduced light by means of the light distributing body, so that the light is emitted in a diffuse manner substantially over the entire light exit area of ​​the light distributing body. The light distributing body is configured in a solid manner.

[0024] The light coupling-in surface can be formed at the interface of the extension and / or the recess of the light distributing body. The recess comprises a first portion in the shape of a spherical element, a cone or a flattened portion, wherein the shape of the first portion can be positive or negative.

[0025] The basic idea of ​​the present invention is to provide a light distributing body and to configure the light distributing body in such a way that the light coupled in by a (single) light emitting device is emitted partly in a diffuse manner and partly in a directed manner from the light distributing body. Since only one light emitting device and a (relatively compact) light distributing body are required, a structurally simple and space-saving construction of a light emitting device with two emission characteristics is achieved.

[0026] In this case, the geometrical design of the recess, at which the light coupling-in area is formed, can be used to influence the emission characteristics of the light distributing body in a targeted manner.

[0027] The light distributor has a dual function. The (first) part of the light coupled into the light distributor is guided inside the light distributor, preferably oriented, so that this part of the light is emitted directionally from the light distributor. Preferably, the directional component of the light coupled into is emitted via a partial area of ​​the light exit area. The (second) part of the light coupled into the light distributor is scattered or distributed by means of the light distributor, so that this part of the light coupled into is emitted in a diffuse manner over substantially the entire light exit area, preferably over the entire light exit area. Here, preferably, the light emitted in a diffuse manner is scattered when it is emitted from the surface of the light distributor forming the light exit area and when it is internally reflected inside the light distributor. In addition, the light is dispersed in the light distributor by internal reflection.

[0028] The light distributing body thus generates a diffuse radiation characteristic by scattering a (first) portion of the light coupled in, and generates a directional radiation characteristic by directional emission of another (second) portion of the light coupled in. The light distributing body is thus designed to emit the light coupled in via the light coupling-in surface with a radiation characteristic that exhibits a superposition of a diffuse radiation characteristic and a directional radiation characteristic. Advantageously, no separate lighting device or optical element for modifying the radiation characteristic is required to provide such a radiation characteristic.

[0029] The luminous device may have an emission characteristic that exhibits a superposition of diffuse emission characteristics and directional emission characteristics. Therefore, using the luminous device, a space, in particular an interior space, can be uniformly illuminated with a single luminous device, while a limited spatial area can be targetedly illuminated with a directional light component.

[0030] In the context of the present description, diffuse light radiation or diffuse radiation characteristics are understood to be a spatial emission pattern that is substantially constant over a large spatial angle range, preferably having a substantially constant intensity over a spatial angle range of 2πsr (steradian) or more. In contrast, directional light radiation or directional radiation characteristics refer to a spatial radiation pattern in which the radiation is confined to a smaller spatial angle range of less than 2πsr, preferably less than 1 sr. Therefore, directional light radiation is not limited to collimated light radiation, but also includes conical radiation patterns with smaller radiation angles (e.g., conical opening angles), which are preferably 45° or less.

[0031] In order to ensure the light distribution function inside the light distributing body, it is further preferred that the light distributing body is formed of a transparent material, preferably glass or transparent plastic. The light distributing body can be constructed in a solid manner (i.e. without a cavity) and is preferably composed essentially entirely of transparent material. With this type of light distributing body, it is particularly easy to structurally implement a directional component of the radiated light. Particularly preferably, a solid, essentially spherical body made of a transparent material forms the light distributing body. In this configuration, a portion of the light introduced into the light distributing body is focused by the essentially spherical light distributing body. This portion of the coupled-in light is directed out of the light distributing body via the region of the light exit surface of the light distributing body opposite to the light coupling-in surface. Therefore, the radiated directional portion of the coupled-in light can be implemented in a particularly simple manner in a geometrically compact, easy-to-manufacture light distributing body.

[0032] Preferably, the diameter of the substantially spherical light distributing body is greater than 5 cm, particularly preferably 5 cm to 50 cm. A substantially spherical body is to be understood as a body whose shape deviates only slightly from a sphere. For example, an ellipsoid whose semi-axis length difference is substantially smaller than the shortest semi-axis length (the semi-axis length difference preferably does not exceed 10% of the shortest semi-axis length) is to be understood as being substantially spherical in the context of the present description. Positive or negative is to be understood here as meaning that the corresponding geometric figure (spherical element or truncated cone) is bent inwards, i.e. is part of the recess (positive shape), or is bent outwards, thereby forming part of the light distributing body (negative shape).

[0033] Since the groove receives most of the light wave surface emitted by the light distributor before the light enters the light distributor, the geometric structure of the first part of the groove is crucial to the beam path inside the light distributor, because the light coupling-in surface is formed at the interface between the groove and the light distributor and can refract the coupled-in light beam. Since the first part of the groove, that is, the light coupling-in surface, is opposite to the area of ​​the light distributor that performs directionally radiated light, the geometric design of the groove, that is, the light coupling-in surface, has a great influence on the component of the directionally emitted coupled beam.

[0034] If the line between the center of the light distributing body and the center of the first part of the first groove is defined as the optical axis, the shape of the first part is selected as a positive spherical element, for example, which causes the incident beam to be refracted away from the optical axis. This results in a decrease in the component of the beam emitted in a direction relative to the component of the beam radiated in a diffuse manner. Conversely, the shape of the first part is designed as a negative spherical element, which causes the incident beam to be refracted toward the optical axis, thereby increasing the component of the beam emitted in a direction.

[0035] If a (positive or negative) cone is chosen as the shape of the first part instead of a spherical element, a quantitatively different but similar effect will occur.

[0036] In a preferred embodiment, the groove further comprises a second portion, which is axial or substantially cylindrical, wherein the first portion is arranged at an end of the second portion away from the surface of the light distributor. In other words, preferably, the second portion of the groove is constructed in an axial or substantially cylindrical manner, extending from the surface of the light distributor to its interior, while the first portion of the groove is arranged at the inner end of the second portion. The second portion of the light coupling-in surface constitutes the interface between the second portion of the groove and the light distributor (i.e., the outer surface of the axial or substantially cylindrical second portion of the groove). In this case, the light coupling-in surface consists of two portions: a first portion constituting the interface between the first portion of the groove and the light distributor, and a second portion constituting the interface between the second portion of the groove and the light distributor. Particularly preferably, the longitudinal axis of the second portion of the groove extends substantially in the radial direction of the light distributor.

[0037] Axis-shaped is to be understood as a groove which extends essentially in a straight line in the longitudinal direction, wherein the cross section is not necessarily constant.

[0038] The advantage of the groove design with the second part is that the beam emitted by the lighting device is first "guided" inside the light distributing body partially by reflection at the outer surface of the second part of the groove before the beam passes through the part of the light coupling-in surface formed at the first part of the groove.

[0039] At the same time, by correspondingly selecting the depth of the second part of the groove, it is possible to control how much of the beam initially emitted by the lighting device is emitted into the light distributing body before the remaining part of the emitted beam is emitted into the first part via the part of the light coupling-in surface formed at the first part of the groove.

[0040] If the second part is designed to be longer, a larger component of the incident light beam whose propagation direction is not parallel to the extension direction of the second part is coupled into the light distributing body through the part of the light coupling-in surface consisting of the interface between the second part and the light distributing body, thereby increasing the component of the beam emitted in a diffuse manner.

[0041] According to a further preferred embodiment, the light coupling-in face is completely and / or partially roughened and / or matte.

[0042] Since reflections at the light coupling-in surface are reduced, the proportion of the radiation emitted in a diffuse manner can also be increased in a simple and effective manner by targeted roughening or matting of the light coupling-in surface.

[0043] According to another example, the light distributor has a reflective element and / or a scattering core for modifying the ratio of directional radiation and diffuse radiation of the light distributor. The reflective element is preferably composed of a partial or complete reflective layer, which is arranged inside the light distributor or on the light coupling input surface, or inside the groove, and can fully or partially reflect the incident beam.

[0044] By reflecting the incident light beam on the reflective element, the component of the beam emitted in a directional manner can be further reduced or adjusted in a targeted manner by partial reflection. Depending on the angular position of the reflective element, it can also be set which part of the incident light enters the light distributor at which angle, which means that the directional radiation characteristics can be further influenced.

[0045] The proportion of the radiation emitted in a diffuse manner can also be increased by introducing scattering cores into the light distributing body. Scattering cores can be introduced into a solid light distributing body, for example, by irradiation with a strongly focused laser beam.

[0046] In another preferred embodiment, the groove (related to the light coupling input surface) in the light distributor has a groove depth and a groove diameter, wherein the groove diameter corresponds to the maximum diameter of the end of the groove facing the light-emitting device, wherein the groove diameter and the groove depth are respectively less than or equal to the radius of the light distributor, and the extension length of the groove in a direction orthogonal to the groove depth direction is never greater than the groove diameter.

[0047] The groove depth is composed of the depth of the first groove portion and the depth of the second groove portion (if any). The groove depth is composed of the depth of the first portion and the depth of the second portion (if any). The depth here refers to the maximum extent of the groove along the direction parallel to the optical axis. If the second portion of the groove is shaft-shaped or cylindrical, the depth is along the longitudinal axis of the second portion of the groove.

[0048] By adjusting or selecting the component between the groove diameter and the groove depth, the radiation characteristics of the light distributor can be further influenced. The larger the groove diameter, the larger the component of the beam emitted in a diffuse manner, while the smaller the groove diameter, the larger the component of the directed radiation. As explained above for the depth of the second element, the larger the groove depth, the higher the component of the beam emitted in a diffuse manner, while the smaller the groove depth, the higher the component of the beam emitted in a directed manner.

[0049] It is further preferred that the groove depth is greater than the groove diameter (D), preferably (at least) twice the groove diameter (D).

[0050] Furthermore, an embodiment in which the groove diameter is smaller than one quarter, preferably smaller than one fifth, and more preferably smaller than one tenth of the radius of the light distributor is preferred.

[0051] By selecting a smaller groove diameter, excessive hollowing of the solid light distributor can be avoided, and a sufficiently large volume can be formed in the light distributor for light propagation and distribution. Thus, the radiation characteristics can be effectively controlled by the design of the light distributor.

[0052] According to a preferred embodiment, the light emitting device has a light guide, which is designed to guide the light emitted by the light emitting device to the light coupling input surface of the light distributing body. Therefore, the light emitting device can be kept at a certain distance from the light distributing body. This is advantageous in terms of design. In addition, the distance between the light emitting device and the light distributing body can be adjusted in a targeted manner by selecting the length of the light guide accordingly. This helps to change the beam angle of the directional light component.

[0053] Any optical element that can be used to transport light in a light guide between a coupling-in face and a coupling-out face of the light guide can be used as a light guide. For example, an optical fiber can be used as a light guide. An elongated element made of a transparent material such as glass or transparent plastic, such as a cylindrical or prismatic element, can also be used as a light guide, wherein light emitted by the light-emitting device is coupled in via a base face and coupled out via an axially distant base face.

[0054] According to another preferred embodiment, the light exit area of ​​the light distributor is formed by a frosted surface. Specifically, the light exit area is formed by a frosted surface on the surface of the light distributor. It is therefore particularly easy to provide diffuse light in the entire light exit area. The frosting of the light exit area can be roughened by conventional methods such as etching or sandblasting.

[0055] In a preferred embodiment, the light distributor is a solid spherical body made of a transparent material, and its surface is frosted except for the light input surface. Due to the spherical shape, the (first) part of the coupled-in light is focused and emitted in a directed manner through the surface area of ​​the light distributor or the part of the light exit area opposite to the light coupling-in surface. The other (second) part of the coupled-in light is diffused to the frosted surface (i.e., the light exit area) of the light distributor, and / or is diffusely reflected on the frosted surface inside the light distributor, and then diffused out through the frosted surface.

[0056] This makes it possible to produce a lighting device which, while using only one lighting device, provides a particularly advantageous and aesthetic combination of diffuse and directional radiation properties and which is particularly simple to manufacture, particularly inexpensive and of particularly compact design. Surprisingly, when a solid (substantially) spherical light distributor made of a transparent material with a frosted surface is used as the light exit area, a lighting device can be produced in which the intensity of the light component diffused by the light distributor can be minimized, the light diffused from the light distributor has a satisfactorily high intensity over the entire light exit area, suitable for uniform lighting and ambient lighting, while the directional part of the emitted light is bright enough to illuminate a limited area of ​​the space in a point-like manner. Furthermore, the light coupling-in surface is preferably formed by a flat ground or polished area at the interface between the light distributor groove and the light distributor. This facilitates the coupling of light into the light distributor.

[0057] The lighting device is preferably composed of one or more LEDs, preferably designed as an LED cluster or an LED-RGB-module. Therefore, a bright, energy-saving, compact and low-cost lighting device can be provided. The lighting device preferably has only one lighting device, which is composed of a (single) LED, an LED cluster or an LED module. If an LED-RGB-module is used as a lighting device, the color of the light emitted by the lighting device can be adjusted. Due to internal reflection and scattering, the light distributor mixes the light colors emitted by the individual LEDs in the LED-RGB-module. This produces a light emission with a uniform color.

[0058] In a (further) preferred embodiment, some areas of the surface of the light distributing body are provided with a reflective coating for partially or completely reflecting the light propagating in the light distributing body and impinging on the reflective coating.

[0059] By locally providing a reflective coating, the radiation characteristics of the light distributor can be further modified in a targeted manner. For example, the radiation of directional light and / or diffuse light can be limited to a specific spatial angle range, or the radiation of directional light and / or diffuse light can be reduced in a targeted manner in a specific area. When using a convex (especially spherical) light distributor with a frosted surface, the surface area can be excluded from the light exit area by locally applying a total reflection reflective coating, because the light distributor will not emit any light in these areas.

[0060] According to a (further) preferred embodiment, the light emitting device comprises a holder, on which the light distributing body is mounted and can rotate around a center. Thus, the user can conveniently adjust the direction of the directional emitted light by rotating the light distributing body on the holder. In this embodiment, a substantially spherical light distributing body is particularly preferred, because such a light distributing body can be mounted and rotated around a center in a structurally simple manner.

[0061] Furthermore, the lighting device preferably comprises a dome which partially or completely surrounds the light distributing body. This protects the surface of the light distributing body from dust and damage. This protection is particularly advantageous for light distributing bodies with frosted surfaces, since contamination of frosted surfaces can affect the diffusion effect and lead to changes in light transmittance.

[0062] According to a preferred further development, the dome has surface areas with different light transmittance, the purpose of which is to change the emission characteristics of the light distributing body. Preferably, at least one surface area has a partially reflecting and / or fully reflecting coating. According to this further development, the emission characteristics of the light-emitting device can be changed by a corresponding design of the dome without changing the light distributing body. As a result, it is possible to achieve suitable emission characteristics of the light-emitting device depending on the application. In addition, an aesthetic design of the light-emitting device can also be achieved.

[0063] It should be emphasized that the light emitting devices of the first and second aspects can also be used in combination. Therefore, the features described in the first aspect can also be provided in the second aspect, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 A perspective exploded view of a light emitting device having a light distributing body is shown;

[0065] Figure 2 Shown in cross section Figure 1 An exploded view of a light emitting device;

[0066] Figure 3 Shows Figure 1 A cross-sectional view of a light emitting device in an assembled state;

[0067] Figure 4 Shown according to Figures 1 to 3 A schematic illustration of achievable emission characteristics of the light emitting device of the illustrated embodiment;

[0068] Figure 5 Shows Figure 4 Illustration of a variation of the illustrated embodiment, in which achievable emission characteristics are schematically shown;

[0069] Figure 6 An illustration showing an embodiment in which the groove consists of only the first portion;

[0070] Figure 7 A diagram showing an embodiment in which a groove is composed of a first portion and a second portion;

[0071] Figure 8 Another embodiment is shown in which the first portion consists of a flattened portion;

[0072] Fig. 9 An embodiment is shown in which the first portion consists of a negative spherical segment;

[0073] Fig.10 An embodiment is shown in which the first portion consists of a negative truncated cone;

[0074] Fig.11 An embodiment having a reflective element at the light coupling-in face is shown;

[0075] Fig.12 and Fig.13 Embodiments with different arrangements of scattering cores in light distributing bodies are shown;

[0076] Fig.14 An arrangement with reflective elements in a light distributing body is shown;

[0077] Fig.15 A qualitative representation is shown Figure 4 and Figure 5 a diagram showing the angular dependence of the emission characteristics that can be produced by the illustrated light emitting device;

[0078] Fig.16 shows a schematic cross-sectional view of a lighting device with a light distributing body according to another embodiment, wherein the emission characteristics are modified;

[0079] Fig.17 shows a schematic cross-sectional view of a lighting device with a light distributing body according to another preferred embodiment, wherein the emission characteristics are modified;

[0080] Fig.18 and Fig.19 shows a schematic cross-sectional view of a lighting device with a light distributing body according to another embodiment, with a holder for the light distributing body;

[0081] Fig. 20 shows a schematic cross-sectional view of a lighting device with a light distributing body according to another embodiment, with a dome;

[0082] Fig.21 Shows Fig. 20 Illustrations of variations of the illustrated embodiment;

[0083] Fig. 22 An example of a lighting device with a light distributing body, a pivoting element and a fastening element is shown;

[0084] Fig.23 Another example of a lighting device having a light distributing body, a pivoting element and a fastening element is shown;

[0085] Fig.24 A further example of a lighting device with a light distributing body, a pivot element and a fastening element is shown. DETAILED DESCRIPTION

[0086] In the following, various aspects of the utility model will be described with further details, features and advantages, which will be described in more detail with reference to the accompanying drawings. The features and feature combinations shown below and described with reference to the accompanying drawings are applicable not only to the respectively proposed combinations, but also to other combinations without thereby departing from the scope of the utility model.

[0087] The accompanying drawings are only schematic and are used to understand the present invention. The same or similar elements may be provided with the same reference numerals in the description of the embodiments.

[0088] Figure 1 The 3D exploded view of a lighting device according to a preferred example is shown. The lighting device includes a light distributor 1 , a light guide 2 and a light emitting device 3 as main components.

[0089] The light emitting device 3 is preferably formed by an LED or an LED unit composed of a plurality of LEDs (eg, an LED cluster or an LED module), but is not limited thereto. The light emitting device 3 is configured to emit light toward the light guide 2 and the light distributor 1 connected thereto.

[0090] The light guide 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 light emitting device. Figure 1 The light guide 2 is shown as a dot-dash line in the exploded view. The light guide 2 has a light coupling input surface 21 and a light coupling output surface 22 at the axial ends, 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 outer surface of the light guide 2 can be provided with a suitable reflective coating to improve the light conduction between the light emitting device 3 and the light distributor 1. Alternatively, the outer surface of the light guide 2 can be provided with an opaque covering portion. It is also feasible that the outer surface of the light guide 2 is not specially modified, but is formed by an untreated or non-specially treated surface. The light guide 2 is used to guide the light emitted by the light emitting device 3 into the light distributor 1. In order to couple light into the light distributor 1, the light distributor has a light coupling input surface 11. In the assembled state, the light guide 2 is attached to the light coupling input surface 11 with the light coupling output surface 22. This can be Figure 2 and Figure 3 It can be seen that Figure 2 and Figure 3 Shows Figure 1 Schematic cross-sectional view of a light emitting device of FIG. The light emitting device 3 is attached to a light coupling-in face 21 of a light guide.

[0091] The light coupling-out surface 22 of the light guide 2 is attached to the light coupling-in surface 11 of the light distributing body 1. Therefore, the light emitted by the light emitting device 3 is coupled into the light guide 2 via the light coupling-in surface 21. Then, the light is guided in the light guide 2 to the light coupling-in surface 11 of the light distributing body 1. Finally, the light is coupled into the light distributing body 1 from the light coupling-out surface 22 of the light guide 2 via the light coupling-in surface 11 of the light distributing body 1.

[0092] exist Figures 1 to 3 In the embodiment shown, the light distributing body 1 has a convex shape. Specifically, the light distributing body 1 shown in the figure is substantially spherical. The shape of the light distributing body 1 deviates from the spherical shape only at the light coupling input surface 11. Figures 1 to 3 In the embodiment shown, the light coupling-in surface 11 is formed in a recess of the light distributing body 1. The light distributing body 1 is solid and is formed of a transparent material (e.g., glass or transparent plastic). Glass is preferred as the material of the light distributing body 1. In order to radiate the coupled-in light, the light distributing body 1 has a light exit area 12 on its surface. Figures 1 to 3 In the illustrated substantially spherical light distributing body 1 , the light exit region 12 is formed substantially by the entire surface of the light distributing body 1 , except for the light coupling-in surface 11 .

[0093] Figures 1 to 3 The light exit area 12 of the light distributing body shown is formed by a frosted or satin surface, i.e., a finely roughened surface at which light is diffusely scattered in the interior of the light distributing body 1 and through which light is emitted in a diffuse manner from the interior of the light distributing body 1. In the case of a light distributing body 1 made of glass, such a surface can be obtained, for example, by sandblasting or etching.

[0094] Use basis Figures 1 to 3 The light emitting device of the embodiment shown can produce a radiation characteristic that includes both a directional component and a diffuse component. Figure 4 , Figure 5 and Fig.15 Provide explanation.

[0095] Figure 4 is based on Figures 1 to 3 Schematic illustration of the emission characteristics that can be achieved by a light-emitting device. Figure 5 Shows Figures 1 to 3 The embodiment shown has a variant without the light guide 2 , with which an emission characteristic having a directional component and a diffuse component can also be obtained.

[0096] First, it is explained that there is Figure 4The emission characteristics of the light-emitting device configured in FIG. The light emitted by the light-emitting device 3 is guided into the light distributing body 1 via the light guide 2. An exemplary beam path through the light guide 2 is schematically shown by the arrows in the light guide 2. The light-emitting device 3 does not emit collimated light, but emits light within a certain angle range. Here, reflections at the inner wall of the light guide 2 can also be caused. Therefore, the light coupled into the light distributing body 1 from the light guide 2 is incident on the light distributing body 1 at different angles.

[0097] Since the light distributing body 1 is formed solidly from a transparent material, the first part of the coupled-in light entering the light distributing body 1 at a sufficiently small angle relative to the central axis of the light emitting device indicated by the dashed line is partially collimated or directed. This (first) part of the coupled-in light is directed out of the light distributing body 1 in the area of ​​the light exit area 12 opposite the light coupling-in surface 11. Figure 4 1 is indicated by a solid arrow at the upper end of the light distributing body 1 , which represents a directional component of the emitted light.

[0098] The second part of the coupled-in light - ie the light which is not emitted in a direction substantially in the region of the light exit area 12 opposite the light coupling-in face 11 - is emitted from the light distributing body in a diffuse manner over the entire light exit area 12. Figure 4 The small dashed arrow inside the light distributing body 1 conceptually indicates that part of the light that hits the frosted surface from the inside is diffusely reflected back into the inside of the light distributing body 1. Therefore, the second part of the coupled-in light is evenly distributed on the light distributing body 1 and is emitted in a diffuse manner over substantially the entire light exit area 12 of the light distributing body 1. This is Figure 4 The dashed arrows at the surface of the light distributor 1 indicate the diffuse component of the emitted light. Due to the frosted surface, when the light is emitted from the light exit area 12, additional scattering will occur.

[0099] exist Figure 5 In the embodiment shown, there is no light guide 2. Here, the light emitted by the light emitting device 3 is coupled directly into the light distributing body 1 via the light coupling-in surface 11. However, the generation of directional light and diffuse light is basically the same as described above. Figure 4 The embodiment shown is similar. Again, the (first) part of the coupled-in light is directed by the collimating effect of the solid light distributing body 1 and is directed out on the part of the light exit area 12 opposite the light coupling-in face 11. The (second) part of the coupled-in light (the part that is substantially not directed out of the light distributing body 1) is distributed on the light distributing body 1 by internal reflection at the frosted surface and is diffusely emitted by the frosted surface substantially over the entire light exit area 12.

[0100] For example, Figure 4 and Figure 5The emission characteristics achievable by the light-emitting device shown are formed by the superposition of diffuse and directional components. Fig.15 The x-axis shows the polar angle θ of the spherical coordinate system with the center of the light distributor 1 as the origin. A value of 0° indicates the direction away from the light coupling-in surface 11 along the center axis of the light emitting device. The y-axis gives the intensity of the light emitted at the corresponding angle θ without specific units. The (first) component of the radiated light, which forms the directional component, is emitted in the area of ​​the light exit area 12 opposite the light coupling-in surface 11. This directional light is emitted at Fig.15 The radiation intensity increases with decreasing θ value as shown in FIG. 1 . The (second) component of the emitted light forming the diffuse component is emitted in a diffuse manner substantially over the entire light exit area 12. Fig.15 It appears as a constant background in the graph.

[0101] Overall, therefore, a radiation characteristic is generated with the light-emitting device, which has a directional component for targeted illumination of limited spatial areas and a diffuse component for uniform illumination of large spatial areas. In other words: the light-emitting device is suitable for generating point illumination with a very soft light spot, which transitions into a diffuse illumination component that is emitted over almost the entire spatial angle. Surprisingly, the intensity of the diffuse component is so high that it achieves uniform ambient lighting. At the same time, the intensity of the directional component is so high that it can generate a significantly brighter soft light spot, with which a limited spatial area can be illuminated in a targeted manner.

[0102] The light distributing device radiates directional light and diffuse light from the light distributing body 1, wherein only a single light emitting device 3 is required. In addition, only one compact optical element is required to generate a radiation characteristic having a directional component and a diffuse component. The light distributing body 1 generates a directional component of the radiated light radiated in a limited spatial angle range and a diffuse component of the radiated light radiated in a very large spatial angle range from the coupled-in light.

[0103] By making simple modifications to the light distribution body 1, the reference can be changed in an appropriate manner according to the lighting requirements. Figure 4 , Figure 5 and Fig.15 For example, if it is desired not to emit light within a certain spatial angle range, the corresponding area of ​​the surface of the light distributor 1 can be excluded from the light exit area 12 by applying a total reflection cover or a reflective coating. It is preferred to use a reflective coating here because the light yield can be increased. Light reflected at the reflective coating inside the light distributor 1 can still be emitted from the light distributor 1 at the light exit area 12.

[0104] Figure 6 An embodiment of a light distributing body 1 having a light exit region 12 is shown. Figures 4 to 14In FIG. 1 , the dot-dash line represents the rotational symmetry axis of the light distribution body 1. Figure 6 In the embodiment of the embodiment, the groove 6, which forms the light coupling input surface 11 at its interface with the light distributor 1, consists only of the first part 61. Here, the first part 61 is formed by a true spherical segment. By this design of the first part 61, the incident light is refracted so that the previously parallel light beams diverge when entering the light distributor 1. This reduces the component of the light emitted in a directionally directed manner. Figure 6 In the embodiment shown, the groove depth T and the groove diameter D of the groove 6 are marked with corresponding reference numerals and are given by the dimensions of the groove 6 (which in the present exemplary embodiment consists only of the first portion 61 ).

[0105] Figure 7 Another embodiment of a light distributing body 1 having a light exit area 12 is shown. In this embodiment, the groove 6, whose interface with the light distributing body 1 forms the light coupling-in surface 11, consists of a first part 61 and a second part 62. The groove depth T is composed of the depths of the first part 61 and the second part 62. The groove diameter D is given by the size of the second part 62. Here, the first part 61 is also formed by a true spherical segment. Therefore, since the light beam that does not extend completely parallel to the optical axis can already be emitted into the light distributing body 1 at the part of the light coupling-in surface 11 adjacent to the second part 62, the component of the diffusely emitted beam in the radiation characteristic is increased again. In the embodiment shown here, the groove depth T corresponds exactly to the radius of the light distributing body 1. The groove diameter D shown is significantly smaller than the radius of the light distributing body 1. In the embodiment shown, the groove diameter D corresponds exactly to one third of the radius of the light distributing body 1.

[0106] Figure 8 Another embodiment of a light distributing body 1 with a light coupling-in face 11 and a light exit region 12 is shown, wherein the first portion 61 is formed by a flattened portion and therefore has essentially no depth. In this case, the groove depth T is essentially defined by the second portion 62 of the groove 6. Since the first portion 61 is designed as a flattened portion, the light beam extending parallel to the optical axis is not refracted when it enters the light distributing body 1, which increases the portion of the beam emitted in a directionally directed manner. As shown here, the groove diameter D is essentially half the groove depth T. Here, the groove diameter D corresponds exactly to one third of the radius of the light distributing body.

[0107] Fig. 9 Another embodiment of a light distributing body 1 with a light exit area 12 is shown. In this embodiment, the groove 6, whose interface with the light distributing body 1 forms the light coupling-in face 11, consists of a first portion 61 and a second portion 62. The groove depth T is given by the combination of the depths of the first portion 61 and the second portion 62. Therefore, the groove diameter D is given by the size of the second portion 62. The embodiment shown is different from Figure 7The embodiment in is basically similar, but here the first part 61 is formed by a negative spherical segment. As a result, the part of the light coupling-in surface 11 formed at the interface between the light distributing body 1 and the first part 61 of the groove has a collimating effect on the incident light beam, thereby increasing the directed emission component of the beam. The first part 61 of the groove 6 is formed by the area adjacent to the negative spherical segment.

[0108] Fig.10 Another embodiment of a light distributing body 1 having a light exit area 12 is shown. In this embodiment, the groove 6, which forms the light coupling-in face 11 at the interface with the light distributing body 1, consists of a first part 61 and a second part 62. Figures 7 to 9 The embodiment in FIG. 1 is basically similar, but the first portion 61 here is formed by a negative tapered section. Therefore, the effect of the light coupling input surface 11 is the same as that of the reference Fig. 9 The effects described are similar. Therefore, in this embodiment, the component of the beam emitted directionally is also increased.

[0109] Fig.11 yes Fig.10 Another improvement of the embodiment shown. Here, as an additional feature, a reflective element 14 is mounted on the light coupling input surface. The incident beam is reflected back from the side by the reflective element 14, which reduces the component of the beam emitted in a direction. This component can be adjusted by changing the penetration of the reflective element 14.

[0110] Fig.12 Shows Figure 6 A development of the embodiment shown, in which scattering cores 15 are introduced into the light distributing body in a semicircular pattern, in order to influence the emission characteristics over a large angular range. Fig.13 Another embodiment is shown, in which another distribution of the scattering cores 15 is chosen. The scattering cores 15 distribute the light diffusely in the light distributing body 1 and increase the component of the diffuse emerging beam.

[0111] Fig.14 Embodiment 6 is shown, in which a reflective element 14 is introduced into the body of the light distributing body 1 to reduce the component of the directionally emitted light. Depending on the intensity of the desired directionally emitted beam, the reflective element 14 can be designed to be partially or completely reflective.

[0112] Fig.16 and Fig.17 Two schematic views of a lighting device with a correspondingly modified light distributing body 1 are shown. Fig.16 and Fig.17 The light distributing body 1 in the embodiment of the present invention is partially provided with a reflective coating 13. In the region of the reflective coating 13, no light is emitted from the light distributing body 1, so that the region with the reflective coating 13 does not form a part of the light exit region 12.

[0113] exist Fig.16 In the configuration shown, the area of ​​the surface of the light distributing body opposite the light coupling-in face 11 is provided with a reflective coating 13. With this configuration, the component of directional light is strongly suppressed. The remaining light exit area 12 emits essentially diffuse light, which is partially reflected at the reflective coating 13 inside the light distributing body.

[0114] exist Fig.17 In the configuration shown, a reflective coating 13 is applied to an annular region of the surface of the light distributing body 1. With this configuration, a superposition of directional light and diffuse light is emitted in the region of the light exit region 12 opposite the light coupling-in face 11. Another part of the light exit region 12 is adjacent to the light coupling-in face 11 and is used to emit diffuse light. With the reflective coating 13, a region that does not emit light is formed between the two parts of the light exit region 12.

[0115] Instead of the reflective coating 13, it is also possible to provide a local coloration or a coating with reduced transmittance at the surface of the light distributing body 1. Thus, the intensity of the light emitted in these areas can be reduced and adjusted. Fig.16 and Fig.17 The embodiment shown with modified emission characteristics can also be used with Figure 5 The light emitting device shown is combined with a configuration without the light guide 2 .

[0116] When a substantially spherical light distributing body 1 is used, the directionally emitted portion of the light coupled into the light distributing body 1 is emitted on a surface area opposite the light coupling-in surface 11. In order to be able to adjust the direction of the directional light component, the light emitting device can be movably held. It is particularly preferred that the light emitting device is held so that the light distributing body 1 is rotatably supported around its center. With this support, the direction of the directionally emitted light can be changed by rotating the light distributing body 1 without causing the light distributing body 1 to change its absolute position.

[0117] This is Fig.18 and Fig.19 According to this embodiment, the light emitting device is supported in a schematically shown holding portion 4 so that the light distributing body 1 can rotate around its center. Fig.18 In the position shown, the directional light component emitted by the light emitting device radiates vertically upward. Fig.19 As shown, if the light distributing body 1 is rotated in the holder, the direction of the directionally radiated light changes. However, the position of the light distributing body 1 remains unchanged. This makes it possible to create a lighting device with a small space requirement, which has a radiation characteristic with a diffuse component and a directional component, wherein the radiation direction of the directional component can be adjusted.

[0118] Fig.18 and Fig.19The configuration with the holding portion shown can be used with Figure 5 The configuration shown without the light guide 2 can also be combined with the configuration according to reference Fig.16 and Fig.17 The described embodiments are combined with a light distributing body 1 having modified emission characteristics.

[0119] In order to protect the light distributing body 1, in particular its frosted surface, from contamination and damage, the lighting device can have a (transparent) dome which at least partially surrounds the light distributing body 1. Fig. 20 In addition to the light distributing body 1, the light guide 2 and the light emitting device 3, the light emitting device also has a dome 5 surrounding the light distributing body 1. In order to improve the overall aesthetics, in this embodiment, it is preferred that the outer surface of the light guide 2 is provided with an opaque cover or coating (not shown). This reduces the visibility of the light guide 2, so that an optical impression is generated that the light distributing body 1 is suspended inside the dome 5.

[0120] In order to modify the Fig. 20 In order to reduce the emission characteristics of the light emitting device, the dome 5 can be provided locally with a coating having reduced transmittance. Fig.21 Schematically shown in FIG. The dome 5 has a first (partial) reflective coating 51 in the upper region and a second (partial) reflective coating 52 in the annular region around the upper region. The transmittances of the coatings 51 and 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 of 0 to 1 can be used. Likewise, local coloring of the dome 5 can be used to modify the emission characteristics of the light emitting device.

[0121] exist Fig.21 In the illustrated embodiment, if the first coating 51 is designed as a total reflection coating and the second coating 51 is designed as a partial reflection coating, the directional component of the light emitted by the light distributing body 1 is substantially completely reflected at the first coating 51. The component emitted by the light distributing body 1 in a diffuse manner is emitted through the area of ​​the second coating 52, and its intensity is reduced by the second coating 52. Thus, a glare-free lighting device having diffuse emission characteristics in a limited spatial area is created.

[0122] Fig.21 The configuration of the coatings 51, 52 shown is purely exemplary. It is obvious to a person skilled in the art that any combination and arrangement of coatings and / or coloring areas on the dome 5 can be used to achieve a desired modification of the emission characteristics of the light emitting device. In addition, the dome 5 can be configured to be removable and replaceable. Thus, the emission characteristics of the light emitting device can be modified by simply replacing the dome 5 with a dome having another coating and / or coloring configuration, without having to modify or change the light distributing body 1 or the light emitting device 3.

[0123] It is obvious to those skilled in the art that Fig. 20 and Fig.21 The illustrated embodiment with the dome 5 can be combined with the other described embodiments of the light distributing body 1 .

[0124] Fig. 22 An example of a lighting device 100 according to the first aspect with a light distributing body 110 , a pivoting element 120 and a fastening element 130 is shown.

[0125] exist Fig. 22 In part a of FIG. 1 , the light emitting device 100 having the light distributing body 110 is shown in a first state.

[0126] In this example, the light distributor 110 is designed to be substantially spherical, for example, to be designed as a whole sphere having a center or center of gravity S. However, in other examples, the light distributor 110 may also be formed differently, for example, to be hollow and / or hemispherical or three-quarter spherical, or to be non-spherical, for example, pyramidal, etc.

[0127] Regardless of its specific shape or other design, the light distributor 110 can have a light incident surface 115. In the example shown, the light incident surface is configured as a plane of an extension of the light distributor 110, wherein the extension can be substantially cylindrical. The extension can be part of the light distributor 110, for example, made integrally with the light distributor from the same material. However, the extension can also be configured as a waveguide, for example, as described with reference to the second aspect. It should be emphasized that with reference to the second aspect (for example, with reference to Figure 1-Figure 21 The light incident surface of the light distributor described in the embodiment of FIG. Fig. 22 Design as described.

[0128] On the contrary, referring to the second aspect of this invention (for example, referring to Figure 1-Figure 21 )The features described above can also be provided in the light distributor 110 or the light emitting device 100.

[0129] For example, the extension can have a (lateral) convex surface that protrudes beyond the rest of the light distributing body 110. For example, the protrusion can be 0.5 mm to 20 mm, or 1 mm to 10 mm. The convex surface can essentially correspond to the outer surface of a cylinder (in the case of an essentially cylindrical extension). However, it can also be planar at least in sections. The light entrance surface 115 can then be formed on the convex surface (for example, as an end face of a cylindrical extension).

[0130] The pivot element 120 can be connected to the light distributing body 110 around a convex surface, for example, surrounding an extension at its convex surface. The pivot element 120 can have a section extending between the light distributing body 110 and the fastening element 130. The section can be configured as a substantially (hollow) cylindrical section. The section can be designed to be opaque to ensure that the light 190 provided by the light source and introduced into the light distributing body is not radiated outward. The pivot element 120 can be movably connected to the fastening element 130.

[0131] For example, the fastening element 130 can be used to mount the light emitting device at a ceiling or other suitable element. For example, the fastener can be anti-rotation. Alternatively, as described herein, a fastener can also be provided that allows the light emitting device 100 to rotate around an axis perpendicular to the ceiling, for example, 180° or 360°.

[0132] The fastening element 130 can be substantially constructed as part of a spherical shell which is constructed concentrically with the light distributing body 110. The pivoting element 120 is movably mounted at the fastening element 130 so that it slides along a pivoting plane of the spherical shell surface so that the light distributing body 110 rotates substantially around its center of gravity or center S without substantially moving in space (except for manufacturing tolerances).

[0133] The light distributor 110 may be configured such that it at least partially emits the provided light 190 as directed light 191. Fig. 22 In part a of , the direction of the directed light (in the drawing plane) is substantially vertical. This direction can be changed without changing the position of the light distributing body 110 in space by pivoting the pivoting element 120 and thereby rotating the light distributing body 110.

[0134] exist Fig. 22 In part b, the light distributor 110 is exemplarily shown to be rotated by 30°. Accordingly, the direction of the directional light is rotated by 30°. This is done by pivoting the pivot element 120 from the first axis R1 to the second axis R2 inclined by 30°. In some examples, a fixed pivot plane is provided in which the pivot element 120 can pivot. However, in these examples, the pivot angle within the pivot plane can still be freely adjusted. In some examples, the pivot angle can be adjusted from 0° (R1) to at least 10°, at least 20°, at least 30° (R2), at least 40°, at least 50°, at least 60°, at least 70° or at least 80°. In some examples, it can also be adjusted within the corresponding negative angle ranges, respectively (then the direction of the directional light will be changed from 0° (R1) to 10° (R2), at least 40°, at least 50°, at least 60°, at least 70° or at least 80°). Fig. 22 to right in the text box).

[0135] The surface of the light distributing body 110 may be substantially matte. The surface may be provided, for example, by sandblasting or similar methods. For example, the light distributing body 110 may be designed in terms of the type of light coupling-in and / or internal elements (as described herein with reference to the second aspect) so that it emits light in a diffuse manner over a major portion or even substantially the entire portion of its spherical surface. This light may correspond to the second portion of the introduced light.

[0136] The light incident surface 115 may have a smooth (eg, polished or ground) surface. The light incident surface may be designed to be substantially flat.

[0137] The light may be emitted, for example, by a light emitting device ( Figure 1 The light-emitting device can have, for example, one or more LEDs, for example, LED clusters and / or LED-RGB modules. The light-emitting device can be arranged, for example, close to the light entrance surface 115, at a distance of 0.5 mm to 5 mm or 1 mm to 2 mm above the surface. By arranging the light-emitting device at the pivot element 120, preferably in the pivot element 120, a space-saving design can be ensured. The light-emitting device is then also always pivoted together, so that the light-emitting device can always be arranged optimally with respect to the light entrance surface 115.

[0138] Fig.23 a shows another example of a lighting device 200 , which has a light distributing body 210 , a pivoting element 220 and a fastening element 230 .

[0139] The light distributor 210 and the light emitting device 200 can be designed, for example, with reference to the light distributor 110 or the light emitting device 100. The light distributor 210 can have a light incident surface 215. The light incident surface can be designed as a plane, and the rest of the body of the light distributor 210 is opposite to the surface of the extension. The extension can basically be, for example, with reference to Fig. 22 Design as described in ab. Fig.23 In the present examples of ab, the extension is designed as an undercut extension, ie, its cross section tapers toward the light distributing body. For example, the extension can generally be formed by an undercut cylinder and / or a truncated cone.

[0140] The pivot element 220 can be constructed in multiple parts. Fig.23 The enlarged view of b is shown.

[0141] The pivoting element 220 may have a sleeve 222, for example, a substantially cylindrical sleeve. The sleeve 222 may be provided with a sleeve 222, for example, by means of an internal thread on the side thereof facing the extension ( Fig.23b) is (detachably) connected to an annular anchoring element 221. The annular anchoring element 221 can at least partially surround the extension at its side. The anchoring element 221 can be configured as an annular element, for example, when the extension is configured as a (undercut) cylinder. By undercutting the cylinder, the anchoring element 221 can be prevented from detaching from the extension.

[0142] For example, the annular element can be formed in two or more parts. For example, the segments of the annular element can correspond to arc segments, which basically surround the extension together. The individual segments can be threaded together, for example, so that they form a circumferential ring. In addition, the anchoring element 221 can also be bonded to the extension and / or the light distribution body 210. The anchoring element 221 can have an external thread, which is used to be threadedly connected to the internal thread of the sleeve 222.

[0143] The sleeve 222 may be provided on a side thereof away from the light incident surface 215 ( Fig.23 b) has another internal thread, which is used for threaded connection with the heat sink 223a / 223b. In other examples, other fastening mechanisms can also be used.

[0144] For example, the heat sink 223a / 223b can be designed in two parts. The heat sink 223a / 223b can have a cylindrical lower section 223a, which is at least partially arranged in the sleeve 222. A circuit board and / or a chip 224 with one or more light-emitting devices (as described herein) can be arranged at the lower side of the section 223a facing the light incident surface 215. This leads to an extremely compact structural form with an optimized cooling effect. The structural size can be minimized, or the allowed luminous intensity can be maximized when the structural size is constant.

[0145] The heat sink 223a / 223b may have an upper section 223b which is at least partially arranged outside the sleeve 222. The upper section may have a plurality of fins to optimize the cooling effect.

[0146] like Fig.23 As shown in FIG. 1 , the upper section 223b of the heat sink may have a substantially arc-shaped or spherical segment-shaped lower side, which may be designed to be substantially concentric with the light distribution body 210. For example, the upper section 223b may be (detachably) connected to the lower section 223a by a threaded connection. However, in other examples, the two sections may also be formed integrally.

[0147] The above-described elements of the exemplary pivot member 220 may pivot together.

[0148] The fastening elements 230 of the lighting device 200 may have upper and lower sides that are substantially arc-shaped or spherical segment-shaped. They may also be designed to be substantially concentric with the light distributing body 210 .

[0149] The fastening element 230 may have a recess through which the pivot element 220 (more precisely: in the present example, its heat sink 223a / 223b) extends. The pivot element 220 may be clamped in the recess so that the pivot element remains fixed in position. For example, the recess may be configured as an elongated hole in the fastening element 230 in the shape of an arc or a spherical segment. Thus, by the action of an external force, the pivot element 220 may be pivoted along the elongated hole so that the light distribution body 210 rotates substantially around its center, and the pivot element 220 together with the circuit board / chip 224, the heat sink 223a / b, the sleeve 222, the anchoring element 221 and the shading object 225 (see below) pivot around the center.

[0150] For example, the anchoring element 221, the sleeve 222, and the cooling fins 223a / b may comprise or consist essentially of metal, and may be surface treated, such as anodized, if desired.

[0151] For example, the fastening element 230 may comprise metal or consist essentially of metal. Optionally, the fastening element may be surface treated. For example, the fastening element may be rotatably supported in the housing so that the light distributing body 210 may be rotated, for example, about an axis of rotation, which extends centrally through the light distributing body 210 and its light entrance face 215 (as described herein). This may be advantageous if the luminous device 200 is to be designed, for example, as a recessed spotlight.

[0152] Alternatively, the fastening element 230 can be connected to the housing in a rotationally fixed manner, which can then be rotatably mounted, for example, at the ceiling. Finally, it is not necessary to provide a housing and in some examples it can also be omitted.

[0153] In order to optimize the sliding properties when the pivoting element 220 is pivoted along the fastening element 230, an intermediate piece 240 can be provided. The intermediate piece can be arranged between the lower side of the upper section 223b of the heat sink and the upper side of the fastening element 230. The intermediate piece 240 can be clamped together with the pivoting element 220 at the fastening element 230 so that it pivots together when the pivoting element 220 pivots. However, various other fastening possibilities are also conceivable. In other examples, the intermediate piece 240 can be fastened to the fastening element 230 in a fixed position so that the pivoting element 220 pivots along the intermediate piece 240.

[0154] The middle piece 240 can have an upper side and a lower side in the shape of a circular arc or a spherical segment. These can also be designed to be substantially concentric with the light distribution body 210. The middle piece 240 can be designed to have a surface that increases the sliding ability. This can be achieved, for example, by a coating. For example, the middle piece 240 can have a Teflon coating. The surface that increases the sliding ability can be arranged at the lower side of the middle piece 240. However, alternatively or additionally, the surface that increases the sliding ability can also be arranged at the upper side of the middle piece 240, for example in the example in which the middle piece 240 is fixedly fastened to the fastening element 230.

[0155] A shade 225 can be arranged between the fastening element 230 and the light distributing body 210 as a further component of the pivot element 220. For example, the shade can be clamped between the underside of the fastening element 230 and a projection of the heat sink 223a / 223b. The shade 225 can have an upper side in the shape of a circular arc or a spherical segment, which extends at least partially along the underside of the fastening element 230. The shade 225 can have a central recess through which the heat sink 223a / 223b extends.

[0156] The underside of the shading element 225 can deviate from a concentric design with respect to the light distributing body 210 , for example, be formed with a larger radius of curvature.

[0157] The shade 225 can have a cavity, which can be designed to be annular, for example, and can extend circumferentially between its upper side and lower side. In some examples, the cavity is used for other components of the light-emitting device 200 to achieve a particularly space-saving design. For example, electronic components can be arranged therein, such as one or more voltage converters for providing a power supply voltage for the light-emitting device, a microcontroller and / or a processor for providing control instructions, a radio receiver for wirelessly receiving control signals for controlling the light-emitting device 200, a radio transmitter for bidirectional communication, etc. This achieves, in particular: maximizing the structural space of the upper section of the heat sink 223b for heat dissipation.

[0158] Fig.24 a and Fig.24 b shows an exemplary lighting mode of the lighting device 300 having the light distributor 310. The lighting device 300 and the light distributor 310 can be designed, for example, with reference to the lighting device 100 or 200 and the light distributor 110 or 210. For example, if the light distributor 310 is arranged in a non-rotated position (see Fig. 22 b), the directional light 391 can be radiated vertically downward ( Fig.24 a). By rotating the light distributor 310 to a rotational position, the directional light 391 can be changed in its direction ( Fig.24 b) The rotation does not change the appearance of the light emitting device 300 .

Claims

1. A light emitting device (100), characterized in that: The light emitting device comprises: A light distributor (110); a pivot element (120) connected to the light distributing body at a first side of the light distributing body; A retaining element (130), wherein the pivot element is pivotally connected to the retaining element so that pivoting of the pivot element relative to the retaining element causes a rotation (R1, R2) of the light distributing body without otherwise substantially moving the light distributing body in space.

2. The light emitting device according to claim 1, characterized in that The retaining element (130) is designed at least partially in the form of a circular arc and / or a spherical shell.

3. The light emitting device according to claim 2, characterized in that The retaining element (130) has a recess through which the pivot element at least partially extends and along which the pivot element can be pivoted.

4. The lighting device according to any one of claims 1 to 3, characterized in that The rotation is performed around the center of gravity and / or the center (S) of the light distributing body.

5. The light emitting device according to claim 2 or 3, characterized in that: The light distributing body (110) is designed in a substantially spherical manner.

6. The light emitting device according to claim 5, characterized in that The light distributing body (110) and the holding element (130) are at least partially designed to be substantially concentric.

7. The lighting device according to any one of claims 1 to 3, characterized in that A second side of the light distributing body opposite to the first side of the light distributing body is free of the pivot element.

8. The light emitting device according to claim 7, characterized in that The second side is designed as a light exit region.

9. The light emitting device according to claim 8, characterized in that The light exit region is designed in a substantially spherical manner and spans a spatial angle of greater than 2π.

10. The lighting device according to any one of claims 1 to 3, characterized in that The light distributor (110) has a light coupling-in surface.

11. The light emitting device according to claim 10, characterized in that The light distributor has a light exit area, which is configured to emit a first portion (190) of light emitted by a light-emitting device and introduced into the light distributor via the light coupling input surface as directional light (191), and to scatter a second portion of the introduced light by means of the light distributor, so that the light is emitted in a diffuse manner substantially over the entire light exit area of ​​the light distributor.

12. The lighting device according to any one of claims 1 to 3, characterized in that The pivot element (120) is arranged to be pivotable such that the pivoting spans a pivot plane, wherein the light distributing body is also arranged to be rotatable by substantially 180° about an axis lying in the pivot plane.

13. The light emitting device according to claim 11, characterized in that The light emitting device is arranged so that the directional light (191) can be emitted at any position over a spatial angle of at least π / 2 by rotating and / or pivoting the light distributing body (110).

14. The lighting device according to any one of claims 1 to 3, characterized in that The light distributing body (110) is designed in a substantially solid manner.

15. The lighting device according to any one of claims 1 to 3, characterized in that The pivoting element (120) has a lighting device (224), a heat sink (223a, 223b) and / or a shade (225).

16. The light emitting device according to claim 1, characterized in that The light emitting device is used for illuminating an interior space.

17. The light emitting device according to claim 10, characterized in that The pivot element (120) at least partially surrounds the light coupling-in surface.

18. The lighting device according to any one of claims 1 to 3, characterized in that The pivot element (120) is arranged to be pivotable so as to pivot across a pivot plane, wherein the light distributing body is also arranged to be rotatable by substantially 360° about an axis lying in the pivot plane.

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