Downlight luminaire with direct and indirect lighting
By introducing curved L-shaped light guide elements and tilted light decoupling surfaces into downlights, the problem of existing luminaires being unable to achieve both direct and indirect lighting simultaneously is solved, enabling flexible lighting configurations and efficient light distribution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZUMTOBEL LIGHTING INC
- Filing Date
- 2025-02-04
- Publication Date
- 2026-07-14
AI Technical Summary
Existing downlights cannot simultaneously meet the requirements of both direct and indirect lighting, especially under the new lighting standards, and their mechanical adjustment components are prone to wear and difficult to adjust flexibly.
A downlight fixture was designed, comprising a light source board, a light mixing chamber, a translucent cover plate, and a light guide element. The light guide element has a curved L-shape for guiding light in the general light emission direction and providing indirect illumination in the opposite direction. Light distribution is achieved through a light coupling surface and an inclined light decoupling surface.
It enables flexible direct and indirect lighting configurations, reduces wear on mechanical parts, improves lighting efficiency and flexibility, and meets new lighting standards.
Smart Images
Figure CN122396884A_ABST
Abstract
Description
[0001] The present invention relates to a downlight luminaire that emits light in different general directions for direct and indirect illumination.
[0002] Currently known downlights are typically constructed solely for direct illumination of the corresponding area to be illuminated. Downlights generally do not provide additional indirect lighting that is perceived as more pleasant to the human eye. New regulations and requirements (such as DIN EN 12464-1:2021-11) mandate an average illuminance of 100 lx on ceilings in office areas. This requirement is extremely difficult to meet with conventionally known downlights.
[0003] EP 2 539 629 B1 illustrates this currently known downlight fixture, while... Figure 6 The prior art luminaire is also illustrated in the example. The downlight luminaire 1001 thus includes a base 1900, the body wall 1950 of which forms a recess, in which optical elements and electrical components of the luminaire 1001 are positioned. A light source plate 1100 is thus mounted on the inner surface of the base 1900, and light sources 1110 are placed on the light source plate 1100. These light sources 1110 are in the general light emission direction L... g Light is emitted from a translucent cover plate 1300, which serves as the light-emitting surface of the luminaire 1001. A light mixing chamber 1990 exists between the cover plate 1300 and the light source plate 1100; this chamber is configured for light mixing and thus homogenizes the emitted light. The translucent cover plate 1300 encloses the substrate 1900 from the underside of the luminaire 1001, and therefore also acts as a moisture-proof, waterproof, and dustproof protective element. A lateral reflector 1700 is arranged within the enclosed area of the substrate 1900, extending from the light source plate 1100 toward the translucent cover plate 1300 to guide the emitted light toward the cover plate 1300. The light emitted via the translucent cover plate 1300 is used for direct illumination L. d This ensures that all light emitted via light source 1110 is used for direct illumination of L. d .
[0004] More recent versions of downlights are known, in which additional light is projected upwards to the ceiling (or, depending on the installation orientation, laterally to the wall) by mechanically moving a light redirection element, thereby providing indirect lighting to meet new lighting requirements. However, indirect lighting produced in this way is extremely susceptible to wear and tear due to its mechanical components and can only be constructed and adjusted with considerable effort (i.e., through mechanical adjustments).
[0005] Therefore, the present invention relates to the task of providing an improved downlight luminaire with flexible construction and adjustment for direct and indirect lighting. This task is solved by the downlight luminaire according to independent claim 1. The invention is defined in the independent claims. Additional features of the invention are provided in the corresponding dependent claims.
[0006] According to the present invention, a downlight luminaire has light emission for direct illumination and light emission for indirect illumination. Thus, the luminaire includes:
[0007] - A light source board having multiple light sources for emitting light in a general light emission direction;
[0008] - A light mixing chamber for homogeneous light mixing behind a light source plate in a general light emission direction, wherein the light mixing chamber has side walls;
[0009] - A translucent cover plate that surrounds the light mixing chamber in the general light emission direction; and
[0010] - An optical guide element, wherein the optical guide element is integrally formed and is substantially flange-shaped, having a curved L-shape in radial cross section, wherein the optical guide element has an optical coupling surface positioned within the optical mixing chamber and facing the light source plate, and wherein the optical guide element has an inclined optical decoupling surface at the distal end region of the optical guide element, wherein the inclined optical decoupling surface of the optical guide element is positioned outside and on the side of the optical mixing chamber.
[0011] Here, light coupled to the light guide element via the light coupling surface is partially guided toward the inclined light decoupling surface within the light guide element. Moreover, light emitted via the translucent cover is emitted for direct illumination, substantially in the general light emission direction; while light emitted via the inclined light decoupling surface is emitted for indirect illumination and is emitted substantially in the indirect light emission direction, which is opposite to the general light emission direction.
[0012] This downlighting luminaire achieves a highly flexible and convenient configuration that allows for both direct and indirect lighting of the corresponding space. Therefore, the light guide element is a key component for achieving light decoupling in a direction opposite to the general light emission direction of the luminaire's light source, thus generating indirect light emission from the luminaire. Through its L-shape in the radial cross-section of the light guide element, light coupled to the end face of the light guide element, which serves as the light coupling surface, is guided towards the distal end of the light guide element. Here, light emitted from the light source into the light mixing chamber is coupled into the light guide element, for example, via the light coupling surface, and is guided to the outside of the luminaire to achieve light emission in a direction opposite to the general light emission direction of the light source. Thus, this shape and configuration of the light guide element does not hinder light mixing within the light mixing chamber; on the contrary, it can even further support light mixing. The inclined light decoupling surface enables easy but efficient light decoupling towards the wall or ceiling (depending on the luminaire's mounting orientation), thereby generating the most advantageous indirect light emission for a downlighting luminaire in addition to the direct light emission provided via the translucent cover. Therefore, this proposed configuration achieves sufficient direct light emission via a translucent cover and indirect light emission via the tilted light-decoupling surface of the luminaire's light-guiding element. Due to the absence of mechanically moving components for achieving indirect light emission, luminaire wear and therefore maintenance requirements are minimized.
[0013] Optionally, depending on the specific implementation of the light guide element, it is also conceivable that, in addition to the light coupling surface directly facing the light source board, light can also be coupled into the light guide element via its sidewalls. This further increases the possible share of indirect light emission in the total light emission of the downlight fixture (i.e., the combined direct and indirect light emission).
[0014] Optionally, light coupled into the light guide element via the light coupling surface (and / or via the sidewall of the light guide element in the light mixing chamber) is (at least) partially guided toward an inclined light decoupling surface within the light guide element. Another potential portion of this light previously coupled into the light guide element can thus be decoupled from the light guide element within the light mixing chamber. Specifically, this can be envisioned to be performed in a bent, L-shaped junction section. However, even this portion of light decoupled from the light guide element is still guided toward the translucent cover, so that this portion is also efficiently used for direct illumination by the luminaire. Therefore, the efficiency of the luminaire is further improved.
[0015] Optionally, the light guide element includes a substantially hollow cylindrical neck section, a substantially plate-shaped annular section, and a curved section connecting the neck section and the plate-shaped annular section, wherein the end face of the neck section faces the light source, thereby forming the light coupling surface of the light guide element, and the plate-shaped annular section has a wedge-shaped section in radial section at the distal end region of the light guide element, thereby forming an inclined light decoupling surface of the light guide element. This particular configuration of the light guide element presents a highly efficient light guide for achieving additional light decoupling for indirect illumination. This exemplary embodiment of the curved L-shaped light guide element allows for efficient light coupling via various surfaces within the light mixing chamber of the luminaire (i.e., via the light coupling surface; via the sidewalls of the light guide element within the light mixing chamber, and specifically, for example, via the sidewalls of the neck section and / or the curved section), and efficiently guides the coupled light toward the distal end region of the light guide element for decoupling via the inclined light decoupling surface. Therefore, preferably, the light guide element is configured such that light coupled into the light guide element via the light coupling surface is guided through the neck portion toward the bend portion, where the light is at least partially guided toward the plate-shaped annular segment. More preferably, another portion of the light previously coupled into the light guide element but not reaching the distal end region of the light guide element is decoupled from the light guide element in the bend portion and guided toward the translucent cover plate. In this way, the entire light emitted from the light source is used for illumination, i.e., partly for indirect light emission and partly for direct light emission.
[0016] Optionally, the light sources are arranged in concentric rings on the light source plate. Through this embodiment, the configuration of the light source arrangement on the light source plate is easily adaptable to various shapes of luminaires and therefore light source plates. The concentric rings further facilitate the coordination of the arrangement of the light guide elements, especially in exemplary embodiments where the optical coupling surface should be arranged facing one of the light source rings. This further improves optical coupling and thus helps to achieve the emission of a greater portion of the light for indirect illumination. Preferably, the diameter of the corresponding ring with the light source substantially corresponds to the diameter of the optical coupling surface.
[0017] Optionally, the light source board has a light source associated with the light guide element, wherein the corresponding associated light source is arranged adjacent to the light coupling surface of the light guide element on the light source board. This further improves the light coupling into the light guide element and further increases the light guided toward the distal end of the light guide element for emission in a direction substantially opposite to the general light emission direction.
[0018] Optionally, the light sources are divided into different light groups, namely a main direct light group and a main indirect light group. The light source of the main direct light group emits light primarily toward the translucent cover plate, while the light source of the main indirect light group emits light primarily toward the optical coupling surface of the light guide element. Although all light sources emit light in the general light emission direction, the light emitted by the main indirect light group is primarily guided toward the optical coupling surface of the light guide element, and therefore the portion of the light reaching the distal end region of the light guide element is mainly influenced by the main indirect light group. Preferably, the different light groups can be independently controlled by the downlight fixture. With this embodiment, the amount of light emitted for indirect illumination is variable and can be further easily controlled. Furthermore, in this configuration, the ratio between direct and indirect light emission is easily adjusted because the different light groups can be selected separately.
[0019] Optionally, the light emitted by the main direct light group is also partially coupled into the light guide element and thereby directed toward the inclined light decoupling surface for indirect illumination. This embodiment further facilitates operation in various lighting scenarios and further ensures that at least a small portion of the light emission is used for indirect illumination in each operating mode of the luminaire. Preferably, the operation of the main direct light group produces indirect light emission accounting for 1% to 5%, more preferably 3% to 5%, of the total light emission of the downlight luminaire. This ensures that in any operating mode of the downlight luminaire, at least 1% to 5%, correspondingly 3% to 5%, or any specific value between these values, is emitted in the opposite light emission direction for indirect illumination. For example, when only the main direct light group of the light source is operated, slight illumination of the corresponding wall or ceiling is achieved, and the lighting pattern can be described as a halo. Therefore, in this embodiment, in scenarios where only a small portion of the light emission is used for indirect illumination, the downlight luminaire has a halo effect as indirect illumination in addition to the usual direct lighting effect. More preferably, the operation of the main direct light group light source together with the main indirect light group light source produces indirect light emission accounting for up to 25%, preferably up to 28%, or up to 30% of the total light emission of the downlight fixture. In this operation, a large area of ceiling (or wall) illumination is achieved by the downlight fixture constructed in this way. Therefore, various lighting scenarios can be achieved through different operating modes and thus different controls on the light source groups. Since the control of the fixture is purely electronic, there is no need to move mechanical parts to change the lighting mode of the downlight fixture.
[0020] Optionally, the ratio of the number of light sources in the main direct light group to the number of light sources in the main indirect light group is approximately 2:1. Therefore, the number of light sources in the main direct light group can range from 30 to 70, preferably from 40 to 60, more preferably about 50 or 48, and the number of light sources in the main indirect light group can range from 15 to 35, preferably from 20 to 30, more preferably about 25 or 24. These ranges and these specific relationships result in a favorable light distribution for both direct and indirect light emission.
[0021] Optionally, the downlight includes a reflective foil positioned near the distal end region of the light guide element on the side opposite the inclined light decoupling surface. This reflective foil further improves light emission in the direction opposite to the general light emission direction. Preferably, the reflective foil is highly reflective. This further reduces light loss and thus further improves the light emission direction opposite to the general light emission direction, i.e., the indirect illumination of the downlight. Preferably, the reflective foil is arranged to be inclined relative to the surface facing the reflective foil in the distal end region. With this particular configuration, the light emission angle of the light emitted in the direction opposite to the general light emission direction is variable. The inclination of the reflective foil and the inclination of the decoupling surface of the light guide element both affect the beam width of the emitted light distribution for indirect illumination. Generally, the more inclined the reflector, the less steep the upward reflection of the light. More preferably, the inclination of the reflective foil differs from the inclination of the inclined light decoupling surface. This configuration further improves light emission for indirect lighting in a synergistic manner, resulting in improved homogeneous light emission in a direction opposite to the general light emission direction. More preferably, the tilt of the reflective foil is less steep than the tilt of the tilted light decoupling surface, i.e., it has a smaller angle. This configuration enables light emission for indirect lighting of downlighting fixtures to provide more direct illumination of the corresponding ceiling (or wall), i.e., light is emitted in a steeper manner in a direction opposite to the general light emission direction.
[0022] Optionally, the tilted light decoupling surface includes a scattering structure for light mixing during light decoupling. This implementation further homogenizes light emission for indirect lighting. Furthermore, different scattering structures can be used to achieve specific light emission characteristics depending on the desired lighting scenario.
[0023] Optionally, the downlight fixture includes a lateral semi-transparent cover that covers the distal end region of the light guide element in the indirect light emission direction, thus facing the inclined light decoupling surface. This additional cover provides protection against moisture, water, and dust. Furthermore, it protects the light guide element from external influences, especially during the installation of the downlight fixture, as the lateral semi-transparent cover is typically mounted on the side of the downlight fixture facing the corresponding ceiling (or wall). Preferably, the lateral semi-transparent cover is conical in radial section, and more preferably, the inclination of the lateral semi-transparent cover is steeper than the inclination of the inclined light decoupling surface. With this embodiment, the inclined light decoupling surface and the lateral semi-transparent cover thus constructed synergistically influence the indirect light emission direction. Preferably, the lateral semi-transparent cover is transparent, or in another preferred configuration, the lateral semi-transparent cover includes a groove structure. Thus, the groove structure can have a substantially sinusoidal shape in a section perpendicular to the radial section. The lateral translucent cover with its grooved structure further influences the light emitted for indirect illumination, and thereby further homogenizes the light. Depending on the grooved structure, different lighting patterns can be envisioned.
[0024] Optionally, the luminaire includes a base, and the base includes a recess, with the light source plate positioned within the recess on the inner surface of the base. In this embodiment, the light mixing chamber can be partially formed by the sidewalls of the base. Alternatively, the base may also include a light source mounting surface on which the light source plate is mounted. Preferably, the base forms a heat sink for the downlight luminaire. This improves heat dissipation and enhances the durability of the luminaire's electronic components. Also preferably, the base includes a through-hole in which the electrical connector of the light source plate is positioned. This further simplifies the mounting of the downlight luminaire and the connection of the luminaire to external electronic connectors.
[0025] Optionally, the downlight luminaire includes a reflector element positioned behind a translucent cover in the general light emission direction. This further improves light emission for direct illumination. Light emitted via the translucent cover is thus guided in a correspondingly desired manner. Depending on the characteristics of the reflector, different lighting scenarios for direct illumination can be achieved. Preferably, the reflector element is attached to a lower housing element of the downlight luminaire and / or to a base. Preferably, the lower housing element is coupled to the base. This embodiment allows for a modular configuration of the luminaire, such that the reflector element can be attached or removed depending on the desired lighting scenario of the luminaire. Therefore, the use of the reflector element and the lower housing element improves the flexibility and stability of the luminaire.
[0026] Optionally, the aforementioned lateral translucent cover can be attached to the lower housing element and / or base of the downlight fixture. This can be achieved via a snap-fit connection.
[0027] Optionally, the light mixing chamber includes a lateral reflector positioned in the general light emission direction between the light source plate and the surface of the light guide element facing the light source plate, preferably an annular segment of plate shape facing the light source plate, wherein the lateral reflector is a side wall of the light mixing chamber. This embodiment further improves light mixing within the downlight. Also via this lateral reflector, light passing through the light guide element, particularly in the neck portion, can be directed toward the translucent cover. Here, it is also conceivable that the light reflected by the lateral reflector is subsequently coupled into the light guide element for guidance toward its lateral end portions to emit light in the indirect light emission direction.
[0028] Optionally, the luminaire base area is elongated, specifically elliptical or rectangular; or circular; or square; preferably, the shape of the light source plate and / or the positioning of the light source are adapted to the shape of the luminaire base area. Therefore, downlights of different shapes can be realized, and the shape of the light source plate, the corresponding arrangement of the light source, and the shape of the light guide element can all be adjusted accordingly.
[0029] Optionally, the light guide element has a constant thickness of 3 mm to 5 mm, preferably 3 mm to 4 mm, extending to the narrower distal end region of the light guide element with an inclined light decoupling surface. This embodiment improves the light guiding characteristics of the light guide element for guiding light toward its distal end region. Furthermore, this embodiment further contributes to homogeneous light mixing within the light mixing chamber.
[0030] Optionally, the translucent cover is diffused. This further enhances the aesthetics of the luminaire and further homogenizes the emitted light used for direct illumination.
[0031] Optionally, the light source is an LED light source, and the light source board is an LED board. Using LEDs as the light source achieves the most flexible and precise light emission.
[0032] Optionally, downlights are one of the following: surface-mounted ceiling lights; surface-mounted wall lights; suspended lights, such as pendant lights; etc. This allows for operation in a variety of scenarios and creates the most flexible lighting fixtures.
[0033] The invention is described in detail below with reference to examples of embodiments and the accompanying drawings. The drawings show:
[0034] Figure 1A A schematic cross-sectional view of an exemplary embodiment of a downlight luminaire having light emission for direct illumination and light emission for indirect illumination, as shown in an angled view from above, according to an embodiment of the present invention;
[0035] Figure 1B from Figure 1AAn enlarged view of a schematic cross-sectional view of an exemplary embodiment of a known downlight fixture according to the present invention;
[0036] Figure 2A A schematic cross-sectional view of an exemplary embodiment of a downlight fixture having light emission for direct illumination and light emission for indirect illumination, according to the present invention, presented as an angled view from below;
[0037] Figure 2B A detailed view of a schematic cross-sectional view, taken from below, of an exemplary embodiment of a downlight fixture having light emission for direct illumination and light emission for indirect illumination, according to the present invention;
[0038] Figure 3A A schematic cross-sectional view, taken as a side view, of an exemplary embodiment of a component of a downlight according to the present invention, shows the light guiding for indirect light emission;
[0039] Figure 3B A schematic cross-sectional view, taken as a side view, of an exemplary embodiment of a component of a downlight according to the present invention, shows the light guide for indirect light emission, wherein a reflective foil is positioned at the distal end region of the light guide element.
[0040] Figure 4 A sketch of an exemplary light distribution curve of an exemplary embodiment of a light guide element of an exemplary embodiment of a downlighting luminaire according to the present invention;
[0041] Figure 5 A top-view schematic diagram of an exemplary embodiment of a light source plate according to an exemplary embodiment of a downlight fixture of the present invention;
[0042] Figure 6 A schematic cross-sectional view of an exemplary embodiment of a known downlight luminaire having light emission for direct illumination, presented as an angled view from below.
[0043] Figure 1A A cross-sectional view in radial section is shown of an exemplary embodiment of a downlight luminaire 1 according to the present invention. The luminaire 1 thus includes a light source plate 100 having a light emission direction L... g Multiple light sources 110, 111, and 112 emit light from the light source. In the illustrated embodiment, the light sources 110, 111, and 112 are LEDs 110, 111, and 112, which are arranged concentrically on the light source plate 100 (i.e., the LED plate 100). Therefore, the diameters L1, L2, and L3 of the corresponding light source rings substantially correspond to the diameter d of the light coupling surface 210. 210As illustrated, some of the light sources 110, 111, and 112 are associated with the light guide element 200, wherein the corresponding associated light source 111 is arranged adjacent to the optical coupling surface 210 of the light guide element 200 on the light source plate 100.
[0044] After the light source board 100, in the general light emission direction L g The luminaire 1 also includes a light mixing chamber 990 for homogeneous light mixing of the light emitted by the light sources 110, 111, and 112. This allows for homogeneous light mixing and thus substantially improves the light emission of the luminaire 1. The light mixing chamber 990 is thereby laterally surrounded by lateral walls 950 and 700, which may be formed by the sidewalls 950 of the base 900 of the luminaire 1 and / or by the lateral reflectors 700.
[0045] In addition, the lamp 1 also has a translucent cover plate 300, which is located in the general light emission direction L. g The upper part surrounds the light mixing chamber 990, while the bottom surface of the translucent cover plate 300 (i.e., the surface of the cover plate 300 opposite to the light mixing chamber 990) forms a surface for direct illumination L. d The light-emitting surface. Preferably, the translucent cover 300 is diffuse, so that components inside the luminaire 1 are invisible to an observer of the luminaire 1. Furthermore, this configuration further improves the light-emitting surface for direct illumination L. d Homogeneous light emission.
[0046] In order to achieve L for indirect lighting i In addition to the light emission, the luminaire 1 also includes a light guide element 200, which is mainly arranged within the light mixing chamber 990, such as... Figure 1A As shown. The light guide element 200 is thus integrally formed and is substantially flange-shaped, having a curved L-shape in radial section, wherein the light guide element 200 has a light coupling surface 201 positioned within the light mixing chamber 990 and facing the light source plate 100. The opposing ends of the light guide element 200 are formed by an inclined light decoupling surface 230 at the distal end region 220 of the light guide element 200, while the inclined light decoupling surface 230 of the light guide element 200 is positioned outside and on the side of the light mixing chamber 990. Therefore, through the light guide element 200, light is emitted in the general light emission direction L within the luminaire 1. g The light emitted from the upper end is directed to the outside of the luminaire 1 and decoupled in the distal end region 220 to form indirect light emission L. i And used for indirect lighting L i Light in the indirect light emission direction L c The light is emitted from the upper part of the image, and the direction of this indirect light emission is different from the general light emission direction L. g The opposite direction, such as Figure 1A , Figure 2A , Figure 3A and Figure 3B It is shown schematically in the diagram.
[0047] exist Figure 1A In the exemplary implementation shown, and in Figure 2A Angled view of cross section and Figure 3A and Figure 3B As shown in further detail in the schematic cross-sectional side view, the light guide element 200 includes a substantially hollow cylindrical neck section 201, a substantially plate-shaped annular section 203, and a bent section 202 connecting the neck section 201 and the plate-shaped annular section 203. These three sections thus form a bent L-shape of the light guide element 200, and therefore guide light coupled from the interior of the luminaire 1, i.e., from the light mixing chamber 990 into the light guide element 200, outward to the external section of the luminaire 1 to decouple it from the light guide element 200, thereby producing an L-shape for indirect illumination. i Light emission.
[0048] In this specific implementation, the end face of the neck section 201 faces the light sources 110, 111, and 112, thereby forming the optical coupling surface 210 of the light guide element 200, and the plate-shaped annular section 203 has a wedge-shaped section in the radial section at the distal end region 220 of the light guide element, thereby forming an inclined optical decoupling surface 230 of the light guide element 200. The tapered configuration of the light guide element 200 at the distal end region 220 thus constructs the inclined optical decoupling surface 230, such that the emitted light is substantially in the same direction as the general light emission direction L of the light sources 110, 111, and 112. g Opposite direction L c Launch.
[0049] Thus, light coupled to the light guide element 200 via the light coupling surface 210 is guided via the neck portion 201 toward the bending portion 202, where the light is at least partially guided toward the plate-shaped annular section 203, where the light is then decoupled from the light guide element 200, thereby providing indirect illumination L of the luminaire 1. i This partly means that not all the light coupled to the photoguide element 200 needs to be ultimately used for indirect light L. i Emission. It can be envisioned that the light coupled to the light guide element 200 within the light mixing chamber 990 is decoupled from the light guide element 200 within the light mixing chamber 990. Here, after being decoupled from the light guide element 200 within the light mixing chamber 990, the light is redirected toward the translucent cover plate 300 and thus used for direct illumination L. d Alternatively, it can be recoupled to the light guide element 200. Therefore, in this embodiment, the entire light emitted by the light sources 110, 111, and 112 is used for direct illumination of L. dAnd therefore in the general light emission direction L g Above the light fixture 1, or for indirect lighting L i And therefore in the opposite light emission direction L c The light emitted from the lamp 1 is opposite to the normal light emission direction L. g Basically the opposite direction, such as Figure 1A , Figure 2A , Figure 3A and Figure 3B As shown. In the light mixing chamber 990, the light decoupled from the light guide element 200 can thus be redirected toward the transparent cover plate 300 via the side walls 700, 950 of the light mixing chamber 990, and thus the light can then be coupled back into the light guide element 200 (and then directed toward the distal end region 220 of the light guide element 200), instead of simply passing through it toward the transparent cover plate 300.
[0050] Specifically, light coupled to the light guide element 200 via the light coupling surface 210 can be partially decoupled from the light guide element 200 in the bent portion 202 and guided toward the translucent cover plate 300. However, it is also possible for light emitted by the light sources 110, 111, 112 of the luminaire 1 to enter the light guide element 200 through surfaces other than the light coupling surface 210 before being guided toward the distal end region 220. This mostly occurs via the neck portion 201 or the side surface of the bent portion 202 of the light guide element 200.
[0051] Therefore, the light guide element 200 preferably has a constant thickness w or width w in all its sections, such that the width w of the neck portion 201 is... 201 Basically corresponds to the width w of the bent portion 202 202 And also corresponding to the width w of the annular section portion 201 of the plate shape. 203 ,like Figure 2B As exemplarily shown. In the illustrated embodiment, the light guide element 200 has a constant thickness w, w' of 3 mm to 4 mm. 201 w 202 w 203 This continues until the narrower distal end region 220 of the optical guide element 200, which has an inclined optical decoupling surface 230. As the width w of the optical guide element 200 tapers at the distal end region 220, it preferably decreases linearly.
[0052] like Figure 1A , Figure 2A , Figure 3A and Figure 3B As further shown, the luminaire 1 includes a lateral reflector 700 disposed inside the luminaire 1 and at the light mixing chamber 990 of the luminaire 1. This lateral reflector 700 is located in the general light emission direction L.g The lateral reflector 700 is positioned between the surface of the annular section 203 of the light source plate 100 and the light guide element 200 facing the light source plate 100. Thus, the lateral reflector 700 forms the lateral wall of the light mixing chamber 990.
[0053] like Figure 1A As further illustrated, the luminaire 1 includes a base 900 forming the housing of the luminaire 1. The base 900 thus has a recess, and the light source plate 100 is positioned within the recess on the inner surface of the base 900 (i.e., the light source mounting surface), and the base 900 can function as a heat sink for the downlight luminaire 1. As further shown, the base 900 includes a through-hole 930, within which an electrical connector 130 of the light source plate 100 is positioned to allow easy and direct electrical connection of the luminaire 1.
[0054] Furthermore, the downlight 1 includes a reflective foil 400 positioned near the distal end region 220 of the light guide element 200 on the side opposite the inclined light decoupling surface 230. Specifically, in... Figure 1B As shown in the enlarged view, the reflective foil 400 is arranged to be tilted relative to the surface facing the reflective foil 400 of the distal end region 220, and the tilt angle α of the reflective foil 400 is... 400 Inclination α of the tilted light decoupling surface 230 230 The difference, and especially the tilt angle α of the tilted light decoupling surface 230, is significant. 230 It's not too steep. Figure 3A and Figure 3B The effect of the reflective foil 400 is illustrated in the summary. As shown therein, the use of the reflective foil 400 results in indirect lighting L... i The light emission is more focused towards the corresponding wall or ceiling. Thus, the beam is converged and, depending on the tilt of the reflective foil 400, is guided more or less steeply in the indirect light emission direction L. c Above. The reflective foil 400 may preferably be highly reflective.
[0055] exist Figure 3A and Figure 3B The image primarily shows light guidance within the light guide element 200. Other light beams, such as those interacting with the lateral reflector 700, are not shown.
[0056] In the illustrated exemplary embodiment, the lower housing element 600 is attached to the base 900, particularly to the sidewall 950 of the base 900. This connection can be performed by a connecting element 988 (such as a screw 988 or a pin 988), and the base 900 and / or the lower housing element 600 include corresponding configurations 980, 680 for connection. Here, the lower housing element 600 includes a socket 680 for receiving the connecting element 988, and the base 900 includes a corresponding socket 980 for interacting with the connecting element 980, for example, by form-fitting and / or force-fitting. Specifically, the socket 980 can be implemented by extending into a protrusion 980 of the light guide element 200. Thus, the light guide element 200 has a corresponding recess 280 that allows connection to the base 900 via the protrusion 980 and the corresponding connecting element 988, such as... Figure 2A As illustrated in the example. This specific implementation also facilitates the positioning of the light guide element 200, thereby ensuring high standards of repeatability.
[0057] Generally, the light guide element 200 can be held within the luminaire 1 via components clamped between the luminaire 1, such as the side reflector 700, the substrate 900 (and especially its sidewall 950), and / or the lower housing element 600 (and specifically its upper surface 610) , as Figure 1A As illustrated. Alternatively or additionally, it is also conceivable that the light guide element 200 is fixed to the substrate 900 via the connecting element 988, such as... Figure 2A As shown.
[0058] In the illustrated embodiment, the reflective foil 400 is disposed on the upper surface 610 of the lower housing element 600. In other embodiments of the luminaire 1, it is also contemplated that the reflective foil 400 is disposed, for example, on the outer surface of the substrate 900. The upper surface 610 may thus also include a socket 680 through which the lower housing element 600 is attached to the substrate 900.
[0059] In addition, the luminaire 1 may also include a reflector element 800, which reflects light in the general light emission direction L. g The reflector element 800 is positioned behind the translucent cover plate 300. Thus, the reflector element 800 can be attached to the lower housing element 600 of the downlight 1 and / or to the base 900. As shown, the lower housing element 600 is further directly connected to the base 900. The reflector element 800 further converges the light for direct illumination L. d Light emission.
[0060] In the illustrated embodiment of luminaire 1, the luminaire 1 has a section with an inclined light decoupling surface 230 (which is positioned in the luminaire 1 and used for direct light emission L). dOn the opposite side, a lateral semi-transparent cover 500 is further provided, which is in the indirect light emission direction L i The light guide element 200 is covered, specifically the distal end region 220 of the light guide element 200 extending outward from the base 900 of the luminaire 1. Figure 2B The protrusion of the optical guide element 200 is further exemplified in the illustration. Figure 2B The diameter d of the substrate 900 is shown. 900 and the outer diameter d of the inclined light decoupling surface 230 230 Therefore, it is obvious that the outer diameter d of the tilted optical decoupling surface 230 230 Diameter d greater than 900 of the substrate 900 The entire distal end region 220 of the optical guide element 200 thus has a larger diameter than the substrate 900.
[0061] Figure 1B An enlarged view of the area of the luminaire 1 with the lateral translucent cover 500 is provided. It is evident from this that the lateral translucent cover 500 is substantially conical in radial section, and furthermore, the inclination α of the lateral translucent cover 500... 500 Inclination α of the tilted light decoupling surface 230 230 It is steeper than that. Also, like... Figure 1B As shown, the tilt angle α of the lateral translucent cover 500 500 Inclination α of the reflective foil 400 400 Steeper than. Utilizing and being emitted for indirect lighting L i The different angles of the light-interacting components allow for control of the luminaire 1 for indirect lighting L. i The corresponding light emission characteristics.
[0062] Furthermore, the indirect lighting L can be adjusted through different specific implementations of the lateral translucent cover 500 or even the surface characteristics of the tilted light decoupling surface 230. i The light emission characteristics. Therefore, it is conceivable that the tilted light decoupling surface 230 includes a scattering structure for light mixing during light decoupling.
[0063] Furthermore, it is conceivable that the lateral translucent cover 500 is transparent to minimize its impact on the lighting effect. However, if the corresponding effect of the lateral translucent cover 500 is desirable, it is preferably configured such that it includes a groove structure, and more preferably, the groove structure has a substantially sinusoidal shape in a section perpendicular to the radial section. Through this particular implementation, the most homogeneous and comfortable indirect lighting L is achieved. i .
[0064] The lateral translucent cover 500 also acts as a protective element against external influences such as unwanted intrusion, dust, moisture, and / or water. Furthermore, the lateral translucent cover 500 enhances the aesthetics of the luminaire 1.
[0065] In addition, the lateral translucent cover 500 can be connected to the base 900 and / or the lower housing element 600, and thus can be connected via form fit and / or force fit.
[0066] Figure 4 An exemplary embodiment of the light source plate 100 is shown. It is thus apparent that the light sources 110, 111, and 112 can be arranged substantially in concentric circles, and in the example shown, three concentric rings are visible, with the fourth concentric ring on the closest side only partially complete. At the center of the light source plate 100, a connector 130 is positioned for connection to an external electrical connector for power supply and / or control communication. The electrical connector 130 thus extends perpendicular to the plane of the light source plate 100, and extends on a surface opposite to the surface on which the light sources 110, 111, and 112 are placed. The light source plate 100 can thus have an orientation element 140 to ensure proper positioning within the luminaire 1. In the example shown, this is achieved by an orientation structure 140 that disrupts the rotational symmetry of the light source plate 100. The connection hole 120 of the light source board 100 can be used to connect the light source board 100 to the base 900 of the lamp 1, and the connection element can interact with the connection hole 120 and more preferably with the fixing point 910 of the base, thereby providing a form-fit and / or force-fit connection.
[0067] Figure 2A and Figure 2B An exemplary arrangement of the light guide element 200 relative to the light source plate 100 is illustrated. In the illustrated embodiment, the light guide element 200 is arranged in the light mixing chamber 990 such that the light emitted from the light source plate 100 in the general light emission direction L... g The light emitted by the light sources 110, 111, and 112 arranged on the near side can reach the translucent cover plate 300 without interacting with the light guide element 200. Therefore, the light sources 110, 111, and 112 arranged on the far side of the light source plate 100, i.e., arranged on the outer concentric ring, are positioned to directly couple light into the light guide element 200 via the light coupling surface 210. Therefore, the diameter d of the outer (first) concentric ring of the light sources 110, 111, and 112... L1 Essentially equal to the diameter d of the optical coupling surface 210 realized by the structure of the neck portion 201 of the optical guide element 200. 210 Therefore, the diameter d of the upper neck portion 201 in the region of the optical coupling surface 210 is... 201 Basically corresponds to the diameter d of the optical coupling surface 210210 Other diameters d of other concentric light source rings L2 d L3 (See) Figure 2A , Figure 2B , Figure 4 The diameter is smaller, specifically smaller than the inner diameter of the neck portion 201 and therefore the inner diameter of the optical coupling surface 210. Therefore, in the illustrated embodiment, the diameter d of each light source ring arranged in the closer-side light source ring is smaller. L2 d L3 The outer diameter d of the optical coupling surface is smaller than 210. 210 Width w of optically coupled surface 210 210 The difference: d L2 d L3 <d 210 -w 210 .
[0068] Therefore, we should reconsider. Figure 5 In the exemplary embodiment of the light source board 100 shown, the different light sources 110, 111, and 112 can be divided into different groups: the main direct light group G 112 and the main indirect optical group G 111 Main direct optical group G 112 The light source 112 mainly emits light towards the translucent cover plate 300, and the main indirect light group G 111 The light source 111 primarily emits light towards the optical coupling surface 210 of the light guide element 200. Therefore, the light source 111 arranged on the far-side light source ring is the main indirect light group G. 111 The other light source 112 is the main direct light group G. 112 The part.
[0069] Therefore, the light sources 110, 111, and 112 associated with the light guide element 200 are the main indirect light group G. 111 The light source 111, and these correspondingly associated light sources 111 are arranged adjacent to the optical coupling surface 210 of the light guide element 200 on the light source plate 100.
[0070] To further improve the operation of lamp 1, different lamp groups G 111 G 112 It can be independently controlled by the downlight 1. Therefore, the main and indirect light groups G can be controlled separately. 111 The light source 111 associated with the light guide element 200 and the main direct light group G 112 Other light sources 112 allow for individual adjustment of individual light groups G according to the desired lighting scene. 111 G 112 The brightness.
[0071] Therefore, in the illustrated implementation scheme, the main direct optical group G112 A portion of the light emitted by the light source 112 is also partially coupled into the light guide element 200, as previously discussed, and is thus guided toward the inclined light decoupling surface 230 for indirect illumination L. i In addition, only the main direct optical group G 112 The operation of the light source 112 produces indirect light emission L accounting for 1% to 5% of the total light emission of the downlight 1, more preferably 3%. i Therefore, indirect illumination L of the luminaire 1 has been achieved without the operation of the light source 111 associated with the light guide element 200. i Effect. Furthermore, the light source 112 of the main direct beam group G112, together with the main indirect beam group G... 111 The operation of the light source 111 together produces indirect light emission L accounting for up to 25%, preferably up to 28% or 30% of the total light emission of the downlight 1. i By emitting so many portions of light for indirect illumination L i This enables large-area ceiling lighting. Therefore, the indirect lighting L produced by the downlight 1 can be variably controlled depending on the number and type of active light sources 110, 111, and 112. i The ratio. Therefore, indirect light emission L... i The intermediate ratio is achievable. Therefore, different lighting scenarios can be operated depending on the corresponding needs and / or expectations.
[0072] refer to Figure 4 This further illustrates the indirect light emission L i Thus, the light distribution curve of the photoconductor 200 is shown, outlining the light emission direction L. c The light emitted from above. Specifically, in the indirect light emission direction L c The light emitted from above is split into light emitted in the indirect light emission direction L. c1 The first set of light emitted upwards and in the indirect light emission direction L c2 The second set of light emitted from above and facing downwards. Therefore, the light distribution curve conforms to... Figure 3A The simulated optical path of the light guide element 200 is shown. It is thus evident that the light emitted by the light guide element 200 at the distal end region 220, and particularly via the bottom surface of the distal end region 220 and the inclined light decoupling surface 230, is emitted in two directions, while in the indirect light emission direction L... c2 The second set of upward-emitting rays facing downwards is unwanted and therefore should be redirected and aligned with the indirect light emission direction L. c1Other beams of light from the upward-facing first group emitted upwards will converge. This is performed in particular by the reflective foil 400, or, if the reflective foil 400 is not present, preferably by another surface of the luminaire 1 located on the bottom surface of the distal end region 220 opposite to the inclined light decoupling surface 230, for example by the upper surface 610 of the lower housing element 600. Figure 3B This illustrates how the use of the reflective foil 400 will affect the indirect light emission direction L. c2 The second set of upward-emitting, downward-facing light is redirected upwards, thereby producing L for indirect illumination. i The homogeneous surface faces upward (i.e., in the direction of general light emission L) g Light emission in the opposite direction.
[0073] like Figure 4 As shown, the preferred ratio of the number of light sources in the main direct light group to the number of light sources in the main indirect light group is approximately 2:1 (one-third of light sources 110, 111, and 112 belong to the main indirect light group G). 111 Furthermore, two-thirds of light sources 110, 111, and 112 belong to the main direct light group G. 112 Therefore, the number of light sources in the main direct light group can be in the range of 30 to 70, preferably in the range of 40 to 60, more preferably about 50 or 48, and the number of light sources in the main indirect light group can be in the range of 15 to 35, preferably in the range of 20 to 30, more preferably about 25 or 24. Thus, each of the foregoing values and the general relationships between these values are conceivable. These ranges and these specific relationships result in favorable light distributions for both direct and indirect light emission. Figure 4 In the implementation scheme shown, the main indirect optical group G 111 Includes 24 light sources 111, and the main direct light group G 112 It includes 48 light sources (112).
[0074] In another specific implementation, it is also conceivable that the nearest-side light source ring is used to directly couple light to the light coupling surface 210 of the light guide element 200, so that the light guide element 200 reaches the center of the luminaire 1. In this configuration, other light sources (i.e., the main direct light group G) are used to couple light directly to the light coupling surface 210 of the light guide element 200, so that the light guide element 200 reaches the center of the luminaire 1. 112 The light emitted by the light source 112 must pass through the light guide element 200 before reaching the translucent cover plate 300 to achieve direct illumination L d The light emission. This is similarly effective for a specific implementation in which the intermediate light source ring (between the far-side light source ring and the near-side light source ring) is associated with the light guide element 200, and its light source 111 is therefore arranged adjacent to the light coupling surface 210 of the light guide element 200 on the light source plate 100.
[0075] Mounting support 920 is also provided on the back side of base 900 to allow easy and flexible installation of luminaire 1. Luminaire 1 can be implemented as a surface-mounted ceiling light, a surface-mounted wall light, a suspended luminaire (such as a pendant luminaire), etc.
[0076] The light source plate 100 can be connected to the base 900 via fixing points 910, which can also be configured for improved heat dissipation from the light source plate 100. Furthermore, the base 900 may be provided with heat sinks for further improvement of heat dissipation in the luminaire 1. The side reflector 700 can be attached to the base 900 via form fit and / or force fit.
[0077] Therefore, the form of the luminaire 1 is not limited to the embodiment shown. Thus, the luminaire base area can be elongated, and specifically, it can be elliptical or rectangular. Alternatively, it is also conceivable that the luminaire base area is circular or square. Preferably, the shape of the light source plate 100 and / or the positioning of the light sources 110, 111, 112 are adapted to the shape of the luminaire base area.
[0078] By implementing the downlight luminaire 1 according to any of the implementation schemes and specific implementations described herein, the most universal downlight luminaire with direct and indirect lighting is realized.
Claims
1. A device having a function for direct lighting (L d Light emission and for indirect lighting (L) i Downlighting fixtures that emit light (1). The lamp (1) includes: - Light source board (100), the light source board having a function for general light emission direction (L) g Multiple light sources (110, 111, 112) emitted from the light on the surface. - Light mixing chamber (990), the light mixing chamber being used in the general light emission direction (L) g Homogeneous light mixing on the light source plate (100) after the light mixing chamber, wherein the light mixing chamber has side walls (950, 700). - A semi-transparent cover plate (300), the semi-transparent cover plate in the general light emission direction (L) g The light mixing chamber (990) is surrounded by the light mixing chamber; and - An optical guide element (200), wherein the optical guide element (200) is integrally formed and is substantially flange-shaped, having a curved L-shape in radial cross-section. The light guide element (200) has an optical coupling surface (201) positioned within the light mixing chamber (990) and facing the light source plate (100), and The light guide element (200) has an inclined light decoupling surface (230) at the distal end region (220) of the light guide element (200), and the inclined light decoupling surface (230) of the light guide element (200) is located outside and on the side of the light mixing chamber (990); The light coupled to the light guide element (200) via the optical coupling surface (210) is partially guided toward the inclined optical decoupling surface (230) within the light guide element (200), and The light emitted through the translucent cover (300) is directed to be emitted substantially in the general light emission direction (L). g Direct lighting on (L) d ); The light emitted via the tilted light decoupling surface (230) is used for indirect illumination (L i And basically in the indirect light emission direction (L) c The indirect light emission direction is the same as the general light emission direction (L) emitted from the source. g (The opposite direction) 2. The lamp according to claim 1, The light guide element (200) includes a substantially hollow cylindrical neck section (201), a substantially plate-shaped annular section (203), and a curved section (202) connecting the neck section (201) and the plate-shaped annular section (203). The end face of the neck section (201) faces the light source (110, 111, 112), thereby forming the optical coupling surface (210) of the light guide element (200). The plate-shaped annular section (203) has a wedge-shaped section in radial section at the distal end region (220) of the light guide element, thereby forming the inclined optical decoupling surface (230) of the light guide element (200). Preferably, the light guide element (200) is configured such that light coupled to the light guide element (200) via the light coupling surface (210) is guided via the neck portion (201) toward the bent portion (202), wherein the light: - The annular section (203) is partially guided toward the shape of the plate, and - In the bent portion (202), it is partially decoupled from the light guide element (200) and guided toward the translucent cover plate (300).
3. The luminaire according to any one of the preceding claims, The light sources (110, 111, 112) are arranged in concentric rings on the light source plate (100); Preferably, the diameters (L1, L2, L3) of the corresponding rings having light sources (110, 111, 112) substantially correspond to the diameter (d) of the optical coupling surface (210). 210 ).
4. The luminaire according to any one of the preceding claims, The light source plate (100) has light sources (110, 111, 112) associated with the light guide element (200), wherein the corresponding associated light source (111) is arranged adjacent to the light coupling surface (210) of the light guide element (200) on the light source plate (100).
5. The luminaire according to any one of the preceding claims, The light sources (110, 111, 112) are divided into different light groups, namely the main direct light group (G). 112 ) and main indirect optical group (G 111 ), wherein the primary direct optical group (G 112 The light source (112) of the main indirect light group (G) emits light primarily toward the translucent cover plate (300), and wherein the main indirect light group (G) 111 The light source (111) of the light guide element (200) emits light mainly toward the optical coupling surface (210) of the light guide element (200); Preferably, the different light groups (G) 111 G 112 (1) can be controlled independently by the downlight (1).
6. The lamp according to claim 5, Among them, the main direct optical group (G) 112 The light emitted by the light source (112) is also partially coupled into the light guide element (200) and thereby guided toward the inclined light decoupling surface (230) for indirect illumination (L). i ); Preferably, the main direct optical group (G) 112 The operation of the light source (112) of the downlight (1) produces indirect light emission (L) accounting for 1% to 5%, more preferably 3% of the total light emission of the downlight (1). i ).
7. The luminaire according to claim 5 or 6, Preferably, the main direct optical group (G) 112 The light source (112) together with the main indirect light group (G) 111 The operation of the light source (111) together with the downlight (1) produces indirect light emission (L) accounting for up to 25%, preferably up to 28% or 30% of the total light emission of the downlight (1). i ).
8. The luminaire according to any one of the preceding claims, The downlight (1) includes a reflective foil (400) positioned near the distal end region (220) of the light guide element (200) on the side opposite to the inclined light decoupling surface (230). Preferably, the reflective foil (400) is highly reflective; Preferably, the reflective foil (400) is arranged to be inclined relative to the surface of the distal end region (220) facing the reflective foil (400); More preferably, the tilt (α) of the reflective foil (400) 400 The tilt (α) of the tilted optical decoupling surface (230) with respect to the tilted optical decoupling surface (230) 230 )different; More preferably, the tilt (α) of the reflective foil (400) 400 The tilt (α) of the tilted optical decoupling surface (230) and the tilt angle (α) 230 It is not as steep as other areas.
9. The luminaire according to any one of the preceding claims, The tilted optical decoupling surface (230) includes a scattering structure for optical mixing during optical decoupling.
10. The luminaire according to any one of the preceding claims, The downlight fixture (1) includes a lateral semi-transparent cover (500), which is positioned in the indirect light emission direction (L... c The distal end region (220) of the light guide element (200) is covered on the light guide element (200), thereby facing the inclined light decoupling surface (230). Preferably, the laterally translucent cover (500) is conical in radial cross-section, and more preferably, the inclination (α) of the laterally translucent cover (500) is... 500 The tilt (α) of the tilted optical decoupling surface (230) and the tilt angle (α) 230 It is steeper than that; Preferably, the lateral translucent cover (500) is transparent; Preferably, the lateral translucent cover (500) includes a groove structure. More preferably, the groove structure has a substantially sinusoidal shape in a cross-section perpendicular to the radial section.
11. The luminaire according to any one of the preceding claims, The lamp includes a base (900), the base (900) includes a recess, and the light source plate (100) is positioned within the recess on the inner surface of the base (900); Preferably, the substrate (900) forms the heat sink of the downlight (1); Preferably, the substrate (900) includes a through hole (930), wherein the electrical connector (130) of the light source board (100) is positioned within the through hole (930).
12. The luminaire according to any one of the preceding claims, The downlight fixture (1) includes a reflector element (800) in the general light emission direction (L). g Positioned behind the translucent cover plate (300); Preferably, the reflector element (800) is attached to the lower housing element (600) of the downlight (1) and / or the base (900) of the luminaire (1), and more preferably, the lower housing element (600) is attached to the base (900).
13. The luminaire according to any one of the preceding claims, The light mixing chamber (990) includes a side reflector (700) which is positioned in the general light emission direction (L). g The light guide element (200) is positioned between the light source plate (100) and the surface of the light guide element facing the light source plate (100), wherein the surface of the light guide element facing the light source plate is preferably an annular segment (203) of the plate shape facing the light source plate (100), wherein the side reflector (700) is the side wall of the light mixing chamber (990).
14. The luminaire according to any one of the preceding claims, The base area of the luminaire is elongated, specifically elliptical or rectangular; or The base area of the lamp is circular; or The base area of the lamp is square in shape; Preferably, the shape of the light source plate (100) and / or the positioning of the light source (110, 111, 112) are adapted to the shape of the lamp base area.
15. The luminaire according to any one of the preceding claims, The optical guide element (200) has a constant thickness (w, w) of 3 mm to 4 mm. 201 , w 202 , w 203 ), up to the narrower distal end region (220) of the optical guide element (200) having the inclined optical decoupling surface (230); and / or The translucent cover plate (300) is diffused; and / or The light sources (110, 111, 112) are LED light sources (110, 111, 112), and the light source board (100) is an LED board (100); and / or The downlight (1) mentioned therein is one of the following: surface-mounted ceiling lights; surface-mounted wall lights; suspended lights, such as pendant lights; etc.