Linear light emitting device providing adjustable beam profile
Through the combined design of elongated reflector and LED light source, the problem of insufficient beam shaping of existing LED lamps is solved, and the adjustable beam profile and efficient lighting effect are achieved, improving aesthetics and lighting performance.
Patent Information
- Application Number
- CN202480008220.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-01-19
- Filing Date
- 2024-01-10
- Publication Date
- 2025-08-19
AI Technical Summary
Existing LED lamps are difficult to achieve significant beam shaping, resulting in a light distribution close to the Lambertian distribution, lacking aesthetic appeal and lighting efficiency.
The elongated reflector design combines peripheral and central LED light sources to achieve an adjustable profile of the beam, including batwing or Lambertian distribution, through the cooperation of different parts of the reflector and the divider.
The adjustability of the beam profile is achieved, the aesthetic effect and lighting efficiency of lighting are improved, the glare is reduced, and the flexibility and energy efficiency of lighting equipment are enhanced.
Smart Images
Figure CN120513367A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a lighting device adapted to emit device light having an adjustable beam profile. Background Art
[0002] Luminaires with downward-facing LEDs are well known. In recent years, another luminaire archetype has gained popularity: luminaires with upward-facing LEDs, where the radiation is emitted into a cavity, providing the beam shape. This cavity is typically formed by a linear, white, non-specular rear reflector, resulting in an efficient and aesthetically appealing, glare-free luminaire. However, significant beam shaping is rarely achieved with a purely non-specular white reflector, and therefore all luminaires based on this concept currently on the market produce a near-Lambertian distribution.
[0003] It is therefore desirable to provide a lighting device, in particular a linear lighting device, comprising an upwardly directed radiation source and having improved beam shaping. Summary of the Invention
[0004] The present invention provides such a light emitting device and is set out in the accompanying claims. The light emitting device according to the present invention is suitable for emitting device light with an adjustable beam profile. The beam profile provided by the light emitting device of the present invention may, for example, have a batwing shape, may be Lambertian or teardrop-shaped. Preferably, the device light has a batwing-shaped beam profile. The light emitting device of the present invention has a longitudinal extension and a lateral extension that is substantially perpendicular to the longitudinal extension. In particular, the light emitting device according to the present invention may be elongated. In the context of the present invention, the term "elongated" means that the longitudinal extension of the light emitting device is significantly greater than the lateral extension of the light emitting device, for example at least twice the lateral extension.
[0005] Throughout this description, directions will be expressed as "downward" and "upward." In the context of the present invention, the term "downward direction" should be understood as a direction aligned with the gravity acceleration vector. The gravity acceleration vector can be understood as the gravity acceleration vector of the celestial body (e.g., Earth) on which the light-emitting device is arranged or positioned. It is intuitively understood that the term "upward direction" refers to the direction opposite to the downward direction (i.e., a direction arranged at a 180° angle to the downward direction).
[0006] The light emitting device according to the present invention comprises a reflector provided with a reflector opening and a cross-sectional extension (T). The reflector further comprises a reflector wall having an inner reflector surface that is reflective of visible light. The reflector (the wall) is curved around a center line (CL), defines a (linear) cavity, and comprises a first edge and a second edge. The first edge and / or the second edge are opposite each other on either side of the center line and can be arranged substantially parallel to the longitudinal extension of the light emitting device. The first edge and the second edge are spaced apart by the transverse extension of the reflector and are delimited by the reflector opening. In particular, the first edge and the second edge can be substantially parallel to each other. The reflector can have a longitudinal extension and a transverse extension that is substantially perpendicular to the longitudinal extension, wherein the longitudinal extension of the reflector is substantially parallel to the longitudinal extension of the light emitting device. The longitudinal extension of the reflector can be identical to the longitudinal extension of the light emitting device.
[0007] The cross-sectional shape of the reflector may be square, rectangular, triangular, circular or similar. In particular, the reflector may comprise a central portion and a peripheral portion in its lateral extension. The reflector may be curved, wherein the central portion and the peripheral reflector portion each have a concave curvature towards the cavity. The (average) radius of the curvature of the peripheral reflector portion may be smaller than the (average) radius of the curvature of the central reflector portion, i.e. the curvature of the peripheral reflector portion is greater than the curvature of the central reflector portion. The peripheral portion of the reflector may be substantially invisible to an observer, thereby providing the advantage of an aesthetically attractive light emitting device combined with improved performance in terms of light distribution.
[0008] The inner surface of the central part may be non-specular. In particular, the inner surface of the central part of the linear reflector may be white. The inner surface of the peripheral part of the reflector may be at least partially specular. In particular, the reflector may have a parabolic cross-section. The white reflector may be made of any material that is close to non-specular and is preferably made of a highly reflective material for efficiency. The non-specular reflector offers the advantage of improved light distribution, so that the device light emitted by the light-emitting device is perceived as coming from the entire linear cavity and is therefore very pleasant. In an embodiment, the specular reflective surface is made of metal. The metal may be or include aluminum, silver, or a combination thereof. For example, the reflector may be made of folded metal. The metal may also be applied to another surface or carrier (such as a polymer layer or a metal layer) by CVD or PVD.
[0009] The peripheral reflector portion can be in the form of a small reflector component that can be specular or semi-specular, reflecting light within a (possibly quite large) directional cone around the specular reflection direction. The greater the specularity of the peripheral reflector portion, the greater the control over the beam shaping possible. On the other hand, a low degree of specularity of the peripheral reflector portion provides less glare from the luminaire at large angles (i.e., in a direction substantially parallel to the lateral extension of the luminaire, as well as in the longitudinal direction).
[0010] The light distribution of the central and peripheral reflector sections can be selected so that one section produces a wide distribution to improve spatial brightness, while the other section provides a narrower distribution to improve task lighting. In such embodiments, the light fixture can include a control unit for controlling the light distribution provided by the different sections of the reflector. For example, the task lighting can be activated by a presence sensor that communicates with the control unit. Such embodiments offer the advantage of reducing energy consumption while maintaining the appearance of the space illuminated by the light fixture.
[0011] According to the present invention, the light emitting device further comprises a frame arranged along at least one of the first edge and the second edge. The frame can be arranged at the reflector opening along the entire longitudinal extension of the reflector, or along a portion of the reflector opening and delimit the light exit window of the light emitting device. When the frame is arranged along only one of the edges, the light emitting device will be asymmetric, having the LED light source only on one side thereof and possibly also having a peripheral portion only on one side thereof, thereby generating an asymmetric light beam. Preferably, the frame is arranged along the first edge and the second edge of the reflector along the entire longitudinal extension of the reflector. The frame comprises an inner surface facing the (linear) cavity.
[0012] The lighting device further comprises a peripheral LED light source and a central LED light source, the peripheral LED light source and the central LED light source being arranged on an inner surface of the frame such that the peripheral LED light source is arranged further away from the light exit window than the central LED light source, for example, between the central LED light source and the reflector wall. Typically, the central LED light source is arranged closer to the center line (CL) than the peripheral LED light source.
[0013] When in operation, the peripheral LED light sources are arranged to emit a first light toward the peripheral portion of (the inner surface of) the reflector, and the central LED light source is arranged to emit a second light toward the central reflector portion of (the inner surface of) the reflector. The first light is redirected into reflected first light after being reflected at the peripheral reflector portion, and the second light is redirected into reflected second light after being reflected at the central reflector portion. The device light essentially includes the reflected first light and / or the reflected second light. Basically, neither the first light nor the second light is emitted directly through the light exit window without being reflected. To this end, the peripheral LED light sources are typically arranged directly opposite the peripheral reflector portion, and the central LED light source is arranged directly opposite the central reflector portion.
[0014] The light-emitting device may include a plurality of LED light sources, each comprising a plurality of LEDs arranged in a row, wherein the LED light sources are arranged substantially parallel to one another. Preferably, the peripheral LED light sources include first and second peripheral LED light sources, preferably comprising LED rows, and the central LED light source includes first and second central LED light sources, preferably comprising LED rows. The LED rows preferably extend parallel to a centerline (CL). The first peripheral light source and the first central light source are mounted on an inner surface of a first frame of the bezel, and the second peripheral light source and the second central light source are mounted on an inner surface of a second frame of the bezel.
[0015] The first light may have a dominant wavelength within a first wavelength range, wherein the second light may have a dominant wavelength range within a second wavelength range.The first wavelength range may be different from the second wavelength range.
[0016] According to the present invention, the light emitting device further includes a separator between the peripheral LED light sources and the central LED light source, such that at least a majority of the second light is shielded from directly impinging on the peripheral reflector portion. Thus, for example, interference between the first and second light from the peripheral LED light sources and, respectively, the central LED light source is canceled / limited. The term "interference" is understood to mean that the first and second light sources (before reflection) do not completely overlap, thereby enabling adjustable intensity distribution of the device light (e.g., Lambertian, batwing, and asymmetric).
[0017] The divider may be arranged on the inner surface of the frame. The inner surface of the frame may include a stepped profile structure as a divider. The divider may protrude substantially perpendicularly to the inner surface of the frame. The main purpose of the divider is to shield / block the first light from being directly projected onto the peripheral reflector part, for example to limit interference with the second light, and vice versa. Preferably, the divider is arranged along the entire longitudinal extension of the frame. The size, shape of the divider and the angle between the divider and the inner surface of the frame may vary and depend on the intended application of the light-emitting device and the design of the peripheral and central LED light sources.
[0018] The peripheral LED light source may comprise a plurality of LEDs arranged in a first row running substantially parallel to the longitudinal extension of the light emitting device. Similarly, the central LED light source may comprise a plurality of LEDs arranged in a second row running substantially parallel to the longitudinal extension of the light emitting device.
[0019] The lighting device may include multiple LED light sources arranged between peripheral LED light sources and a central LED light source. This embodiment provides the advantage of increased flexibility in the lighting device because the light intensity distribution provided by each LED light source is adjustable. Using LED light sources emitting light with varying intensities can also provide the advantage of reducing glare from the lighting device. When multiple LED light sources are present, a separator may be placed between each two LED light sources so that light from each LED light source is shielded and / or blocked to prevent interference with light emitted by other LED light sources.
[0020] It should be noted that at least the LEDs of the peripheral LED light source may be placed at an angle relative to the inner surface of the bezel and / or relative to the LEDs of the central LED light source.The described embodiment provides the advantage of improving the separation between the first light and the second light.
[0021] Each LED light source can emit light having a dominant peak wavelength within a wavelength range that differs from the wavelength range of the light emitted by the other LED light sources, thereby providing the possibility of achieving different spectra and, therefore, different CCTs in different beams of the device light. Another advantage of this embodiment is that it enables horizontal light distribution with a higher MDER (Human Centric Light Effect) and functional lighting with, for example, 4000K.
[0022] Each LED light source can be pixelated to allow adjustment of the color temperature (e.g., 3000K, 4000K, 5000K, 6500K) depending on the application and / or time of day (following the daylight curve).
[0023] The border may be characterized in that a stepped profile divides the border into a proximal portion arranged adjacent to the peripheral portion of the reflector and a distal portion arranged at a certain distance from the peripheral portion of the reflector. In the embodiment described, the peripheral LED light sources are arranged on the proximal portion of the border and the central LED light source is arranged on the distal portion of the border. In particular, the proximal portion and the distal portion may be arranged in different parallel planes, for example, so that the central LED light source is located at a lower height relative to the peripheral LED light sources. The term "height" in this context means the distance between the surface to be illuminated and the LED light sources. In other words, the distance between the surface to be illuminated and the central LED light source may be smaller than the distance between the surface to be illuminated and the peripheral LED light sources.
[0024] In an alternative embodiment, the peripheral LED light sources and the central LED light source may be arranged at the same height. In such an embodiment, the first light and the second light may be separated from each other by an optical element (e.g., a linear lens, preferably one side of which is reflective). In other words, the separator in such an embodiment takes the form of an optical element. When the LED light source includes multiple LEDs, the optical element may be separate for each LED, or may be a linear optical element covering all LEDs in the LED light source.
[0025] According to another embodiment, the first light and the second light can be separated by a separator in the form of a (vertical) plate, a shutter or a mirror arranged between the peripheral and central LED light sources. When the separator is in the form of a mirror, the optical efficiency is improved.
[0026] It is also conceivable that the linear cavity is in the form of a rotating structure, such as a downlight.
[0027] The lighting device according to the present invention may further comprise a housing arranged to accommodate the reflector.
[0028] The present invention also relates to a luminaire comprising a light-emitting device as described above, preferably further comprising mounting means, such as a suspension cable, hooks and / or clips for gripping around a T-grid of a false ceiling, thereby mounting the luminaire on a wall or ceiling. Typically, the luminaire may be an open-cavity luminaire, wherein the light exit window is open (i.e., without, for example, a cover, plate, hood, and / or optical element). BRIEF DESCRIPTION OF THE DRAWINGS
[0029] This and other aspects of the invention will now be described in more detail, with reference to the accompanying drawings, which show embodiment(s) of the invention.
[0030] Figure 1 shows a schematic cross-sectional side view of a light emitting device according to a first embodiment of the present invention; Figure 2shows a schematic cross-sectional side view of a light emitting device according to a second embodiment of the present invention; Figure 3 A perspective view showing a light emitting device according to a third embodiment of the present invention; Figure 4 shows a perspective view of a lamp according to an embodiment of the present invention; Figure 5-8 Shown Figure 2 The light distribution produced by the light emitting device shown.
[0031] As shown in the figures, the sizes of layers and regions are / may be exaggerated for illustrative purposes, and thus, these sizes are provided for describing the general structure of embodiments of the present invention. Like reference numerals refer to like elements throughout. DETAILED DESCRIPTION
[0032] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which presently preferred embodiments of the invention are shown. However, the invention may be embodied in many different forms, and the invention should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and to fully convey the scope of the invention to those skilled in the art.
[0033] Figure 1 A cross-sectional view and a perspective view, respectively, of a first embodiment of a linear light emitting device 1 according to the present invention are depicted. As mentioned above, the light emitting device 1 according to the present invention is suitable for emitting device light 24 having an adjustable beam profile. The beam profile of the device light 24 provided by the light emitting device according to the present invention can, for example, have a batwing shape, which may be Lambertian or teardrop-shaped. Preferably, the device light 24 has a batwing-shaped beam profile.
[0034] A first embodiment of the light emitting device 1 according to the invention comprises an elongated reflector 2 having a reflector opening 23 and a cross-sectional extension T. The reflector 2 is curved around a center line CL and delimits a cavity 3. The reflector 2 comprises a first edge 4 and a second edge 5 opposite each other on either side of the center line CL, the edges 4 and 5 being spaced apart by a lateral extension T of the reflector 2 and delimited to the reflector opening 23. The reflector 2 further comprises a reflector wall 7 having an inner reflector surface 6 facing the cavity 3. A frame 10 is connected to the first edge 4 at the reflector opening 23 and extends along the center line CL. The frame 10 is delimited by the light exit window 22 and comprises an inner frame surface 11 facing the cavity 3. The light emitting device 1 further comprises a peripheral LED light source 12 and a central LED light source 13, which are arranged on the inner surface 11 of the frame 10 and facing away from the light exit window 22. The peripheral LED light source 12 is arranged to emit a first light 14 to the peripheral reflector portion 9 of the reflector 2 when in operation. The central LED light source 13 is arranged to emit a second light 15 to the central reflector portion 8 of the reflector 2 when in operation. The cross-sectional shape of the reflector 2 is substantially parabolic. The central reflector portion 8 is concavely curved toward the cavity 3 around the center line CL and has a (average) first radius of curvature. The peripheral reflector portion 9 is also concavely curved toward the cavity 3 around the center line CL and has a (average) second radius of curvature. The first radius of curvature is greater than the second radius of curvature. The peripheral reflector portion 9 of the reflector 2 can be substantially invisible to an observer, thereby providing the advantage of an aesthetically attractive light emitting device 1 combined with improved performance in terms of light distribution.
[0035] The inner surface 6 of the central reflector portion 8 can be non-mirrored. In particular, the inner surface 6 of the central reflector portion 8 can be white. The inner surface 6 of the peripheral reflector portion 9 can be at least partially mirrored. The lighting device 1 further includes a divider 16 positioned between the peripheral LED light sources 12 and the central LED light source 13. In the first embodiment, the divider is shown tilted at an angle of approximately 70 degrees relative to the inner frame surface, such that at least a majority of the second light 15 is blocked from directly impinging on the peripheral reflector portion 9. Consequently, a majority of the first light 14 is reflected by the peripheral reflector portion 9 and becomes reflected first light, while a majority of the second light 15 is reflected by the central reflector portion 8 and becomes reflected second light. The divider 16 extends along the entire longitudinal direction of the frame 10. The size and shape of the divider 16, as well as the angle between the divider 16 and the inner surface 11 of the frame 10, can vary and depend on the intended application of the lighting device 1 and the design of the peripheral and central LED light sources 12 and 13. The primary purpose of the divider 16 is to direct the majority of the second light 15 toward the inner surface 6 of the central portion 8. The term "most part" is understood to mean at least 50%. The peripheral reflector portion 9 may be in the form of a small reflector component which may be specular or semi-specular, reflecting light in a (possibly rather small) directional cone around the specular direction, e.g. Figure 1-2 As shown. The higher the degree of specularity of the peripheral reflector portion 9, the greater the control over beam shaping. On the other hand, the low degree of specularity of the peripheral reflector portion 9 provides the lighting device 1 with less glare at large angles (i.e., in a direction substantially parallel to the lateral extension T of the lighting device 1, as well as in the longitudinal direction). During operation, the device light 24 emitted by the lighting device 1 is essentially formed by the first reflected light and / or the second reflected light. The separator 16 between the peripheral and central LED light sources 12, 13 counteracts (excessive) undesirable interference between the first light 14 and the second light 15. Because the first light 14 and the second light 15 do not completely overlap, the intensity distribution of the device light can be adjusted (e.g., Lambertian, batwing, and asymmetric). It is possible that a portion of the first light 14 emitted by the peripheral LED light source 12 will impinge on the inner surface 6 of the central portion 8. Furthermore, it is conceivable that a portion of the second light 15 emitted by the central LED light source 13 will impinge on the inner surface 6 of the peripheral portion 9.
[0036] like Figure 2 As shown, the lighting device 1 according to the present invention is structurally similar to Figure 1 The illustrated embodiments of the light emitting device according to the invention are similar but nevertheless differ from each other in several respects. Figure 2The illustrated embodiment of the light emitting device 1 comprises a first frame 10, 10a and a second frame 10, 10b, which are connected to the respective first edge 4 and the second edge 5 at the reflector opening 23 and extend along the center line CL. The first and second frames 10, 10a, 10b are delimited by the light exit window 22 and comprise a first inner frame surface 11, 11a and a second inner frame surface 11, 11b facing the cavity 3. The light emitting device 1 further comprises a first peripheral LED light source 12, 12a and a second peripheral LED light source 12, 12b, and a first central LED light source 13, 13a and a second central LED light source 13, 13b. The peripheral LED light sources 12, 12a, 12b and the central LED light source 13, 13a, 13b are arranged on the inner surfaces 11, 11a, 11b of the frames 10, 10a, 10b and face away from the light exit window 22. As Figure 2 As can be seen in the figure, the peripheral LED light source 12 includes two LEDs arranged in a first row running substantially parallel to the center line CL. Similarly, the central LED light source 13 includes two rows of LEDs arranged substantially parallel to the center line CL. Each inner frame surface 11, 11a, 11b of the first and second frames 10, 10a, 10b includes a multi-step profile structure, one of the steps serving as a separator 16 between the peripheral LED light sources 12, 12a, 12b and the central LED light sources 13, 13a, 13b. The separator 16 extends perpendicular to the inner frame surfaces 11, 11a, 11b and divides each frame 10, 10a, 10b into a corresponding proximal portion 17 arranged adjacent to the peripheral reflector portion 9 and a corresponding distal portion 18 arranged at a certain distance from the peripheral reflector portion 9, and wherein the proximal portion 17 and the distal portion 18 are arranged in different planes extending parallel to the light exit window 22. Due to the presence of the divider 16 , at least most of the second light 15 is blocked and does not directly impinge on the peripheral reflector portion 9 .
[0037] Figure 3 A perspective view of a third embodiment of a light emitting device 1 according to the present invention is shown, which has a structure similar to that of Figure 1 and Figure 2The light emitting device 1 comprises a reflector 2 having a longitudinal extension in a direction along a center line CL and a transverse extension T of a cross section substantially perpendicular to the longitudinal extension, wherein the longitudinal extension of the reflector 2 is substantially parallel to the longitudinal extension of the light emitting device 1. The longitudinal extension of the reflector 2 is identical to the longitudinal extension of the light emitting device 1. The reflector 2 delimits a linear cavity 3 and comprises a first edge 4 and a second edge 5, which are arranged substantially parallel to the longitudinal extension of the light emitting device 1. The reflector 2 has a wall 7 comprising an inner surface 6 facing the linear cavity 3. The first and second edges 4, 5 are spaced apart by the transverse extension of the reflector 2. The light emitting device 1 further comprises a border 10, 10a, 10b arranged along the first edge 4 and the second edge 5. The edges 10, 10a, 10b are arranged along the entire longitudinal extension L of the reflector 2. In Figure 3 In the embodiment shown, the first and second edges 4, 5 are substantially parallel to each other. Each frame 10, 10a, 10b comprises a single stepped profile, wherein the step functions as a divider 16. The divider 16 extends perpendicularly to the inner frame surface 11, 11a, 11b and divides each frame 10, 10a, 10b into a respective proximal portion 17 arranged adjacent to the peripheral reflector portion 9 and a respective distal portion 18 arranged at a distance therefrom, wherein the proximal portion 17 and the distal portion 18 are arranged in different planes extending parallel to the light exit window 22. The lighting device 1 further comprises a peripheral LED light source 12 and a central LED light source 13, the peripheral and central LED light sources 12, 13 being arranged on the inner surfaces 11, 11a, 11b of the respective proximal portion 17 and the respective distal portion 18 of the frame 10, 10a, 10b such that the peripheral LED light source 12 is arranged between the central LED light source 13 and the reflector 2.
[0038] The frame 10 has a proximal portion 17 disposed adjacent to the peripheral portion 9 of the reflector 2 and a distal portion 18 disposed at a distance from the peripheral portion 9 of the reflector 2. The peripheral LED light source 12 is disposed on the proximal portion 17 of the frame 10, and the central LED light source 13 is disposed on the distal portion 18 of the frame 10. Figure 2-3 As shown, the proximal portion 17 and the distal portion 18 are arranged in different planes parallel to the light exit window 22, for example, so that the central LED light source 13 is located at a lower height relative to the peripheral LED light sources 12. In this context, the term "height" refers to the distance between the surface to be illuminated and the LED light source. In other words, in a direction perpendicular to the light exit window 22, the distance between the light exit window 22 and the central LED light source 13 is smaller than the distance between the light exit window 22 and the peripheral LED light sources 12.
[0039] Figure 4FIG. 1 shows a perspective view of a lamp 100 according to an embodiment of the present invention. The lamp 100 includes a housing 110 that receives Figure 1 The housing 110 also houses a sensor 120 (shown in dotted lines) that enables a user to remotely control the lighting device 1. The housing has a mounting member 130 that Figure 4 Inside are a pair of suspension cables for mounting the fixture to a wall or ceiling.
[0040] Shift your attention to Figure 5-8 The beam shape of the device light provided by the illustrated light fixture 1. The light distribution of the central reflector portion 8 and the peripheral reflector portion 9 can be selected so that one portion produces a wide distribution to improve spatial brightness, while other portions provide a narrower distribution to improve task lighting. In this embodiment, the light fixture can include a control unit (not shown) for controlling the light distribution provided by different portions of the reflector 2. For example, task lighting can be activated by a presence sensor that communicates with the control unit. This embodiment offers the advantage of reduced energy consumption while maintaining the aesthetic appearance of the space illuminated by the light fixture. Figure 5 Shown Figure 2 The light distribution produced by the lighting device shown, wherein the LED light sources 13 on the outer left and the outer right are both working. Figure 6 As can be seen in FIG, when only the right central LED light source 13 is working, the light distribution generated by the light emitting device 1 changes. Figure 7 As shown, when the LED light sources 12 on the peripheral left and peripheral right are operating, the light distribution has a batwing profile. Figure 2 The lighting device 1 shown in FIG generates an asymmetrical light distribution profile, wherein Figure 8 As shown, only the left peripheral LED light source 12 is working.
[0041] Those skilled in the art will recognize that the present invention is by no means limited to the preferred embodiments described above. On the contrary, within the scope of the appended claims, multiple modifications and variations are possible. For example, the features of the different embodiments described herein may be combined in different ways.
[0042] Moreover, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims
1. A light emitting device (1), adapted to emit device light (24) having an adjustable beam profile through a light exit window (22), the light emitting device (1) comprising: An elongated reflector (2) having a reflector opening (23) and a cross-sectional extension (T), the reflector being curved about a center line (CL) and defining a cavity (3), the reflector (2) comprising: a first edge and a second edge (4, 5) opposite each other on either side of a center line (CL), the first edge and the second edge being spaced apart by the transverse extension (T) of the reflector (2) and delimiting the reflector opening (23), and a reflector wall (7) having an inner reflector surface (6) facing the cavity (3), a first frame (10, 10a), the first frame being connected to the first edge (4) at the reflector opening (23) and extending along a center line (CL), the first frame (10, 10a) being bounded by the light exit window (22) and comprising a first inner frame surface (11, 11a) facing the cavity (3), The light emitting device (1) further comprises a first peripheral LED light source (12) and a first central LED light source (13), wherein the first peripheral and first central LED light sources (12, 13) are arranged on the first inner frame surface (11, 11a) of the first frame (10, 10a) and face away from the light exit window (22), The first peripheral LED light source (12) is arranged to emit first light (14) towards the peripheral reflector portion (9) of the reflector (2) when in operation, and the first central LED light source (13) is arranged to emit second light (15) towards the central reflector portion (8) of the reflector (2) when in operation, wherein the lighting device (1) further comprises a separator (16) between the first peripheral and the first central LED light sources (12, 13), such that at least a majority of the second light (15) is shielded from being projected directly onto the peripheral reflector portion (9), wherein the inner surface (6) of the central reflector portion (8) is non-specular, and wherein the inner surface (6) of the peripheral reflector portion (9) is at least partially specular.
2. The light emitting device (1) according to claim 1, further comprising a second frame (10, 10b), which is connected to the second edge (5) at the reflector opening (23), the second frame being delimited by the light exit window (22) and comprising a second inner frame surface (11, 11b), wherein the second peripheral and the second central LED light sources (12, 13) are arranged on the second inner frame surface (11, 11b) of the second frame (10, 10b).
3. The light emitting device (1) according to claim 1 or 2, wherein the light emitting device (1) is linear and has a longitudinal extension (L) that is essentially perpendicular to the cross-sectional extension (T).
4. The lighting device (1) according to claim 1, 2 or 3, wherein the inner frame surface (11) of each frame (10) comprises a stepped profile structure as the separator (16).
5. The lighting device (1) according to claim 1, 2, 3 or 4, wherein the separator (16) is arranged substantially perpendicular to the inner frame surface (11) of each frame (10).
6. The light emitting device (1) according to any one of claims 1 to 5, wherein in the cross-sectional extension (T), the central reflector portion (8) and the peripheral reflector portion (9) each have a concave curvature towards the cavity (3).
7. The light emitting device (1) according to claim 6, wherein an average radius of the curved surface of the peripheral reflector portion is smaller than an average radius of the curved surface of the central reflector portion.
8. The light emitting device (1) according to any one of the preceding claims, wherein the light emitting device (1) is elongated.
9. A lighting device (1) according to any of the preceding claims, wherein each peripheral LED light source (12) comprises a plurality of LEDs, said plurality of LEDs being arranged in a first row running substantially parallel to said longitudinal extension (L) of the lighting device (1), and wherein each central LED light source (13) comprises a plurality of LEDs, said plurality of LEDs being arranged in a second row running substantially parallel to said centre line (CL) of the lighting device (1).
10. The light emitting device (1) according to any one of the preceding claims, wherein the border (10) has a proximal portion (17) arranged adjacent to the peripheral portion (9) of the reflector (2) and a distal portion (18) arranged at a distance from the peripheral portion (9) of the reflector (2), and wherein the proximal portion (17) and the distal portion (18) are arranged in different parallel planes.
11. The lighting device (1) according to claim 10, wherein each peripheral LED light source (12) is arranged on the proximal portion (17) of each bezel (10), and each central LED light source (13) is arranged on the distal portion (18) of each bezel (10).
12. The lighting device (1) according to any one of the preceding claims, wherein the lighting device (1) comprises a plurality of LED light sources, each of the LED light sources comprising a plurality of LEDs arranged in a row, wherein the LED light sources are arranged substantially parallel to each other.
13. The lighting device (1) according to any one of the preceding claims, wherein the lighting device (1) further comprises a housing, the housing being arranged to accommodate the reflector (2).
14. The light emitting device (1) according to any of the preceding claims, wherein the first light (14) has a dominant wavelength within a first wavelength range, wherein the second light (15) has a dominant wavelength range within a second wavelength range, and wherein the first wavelength range is different from the second wavelength range.
15. A luminaire, comprising the light emitting device (1) according to any one of the preceding claims, and a mounting member (130) for mounting the luminaire.