Composite light distribution module, lamp and lighting device

Abstract

This utility model discloses a composite light distribution module, a lamp, and a lighting device, relating to the field of lighting technology. The composite light distribution module includes a first lens and a second lens arranged sequentially from the inside to the outside along the optical axis. The first lens is arranged around the light source and has a first inner freeform surface and a first outer freeform surface. The surface of the first inner freeform surface facing the light source is concave along the optical axis. The first outer freeform surface and the first inner freeform surface form a first elliptical profile with decreasing thickness along the optical axis. A first light diffusion structure is disposed on the first outer freeform surface. The second lens is sleeved on the outside of the first lens and has a second inner freeform surface and a second outer freeform surface. The second inner freeform surface is arranged around the first outer freeform surface. The second outer freeform surface and the second inner freeform surface form a second elliptical profile with increasing thickness along the optical axis.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a composite light distribution module, a lamp and a lighting device. Background Technology

[0002] In the field of lighting technology, uniform illuminance has always been a core technical challenge restricting lighting quality. Traditional lighting devices generally adopt a direct-light-emitting structure, which distributes light through a single refractive or reflective surface. Although this can meet basic brightness requirements, it has significant technical defects.

[0003] Uniform light emission from all angles requires overcoming the formation of bright spots and dark areas. For example, traditional diffusion structures struggle to balance the angle of light scattering, leading to bright spots or dark areas at the edges of light strips or fixtures. For instance, conventional light strips exhibit significantly weaker side light intensity than front light due to insufficient LED chip density or flawed diffusion layer design. Secondly, uniform light emission from all angles requires addressing the issue of dark areas along the vertical optical axis. Because traditional LED chips are arranged in a planar array, light is concentrated horizontally, and dark areas easily form in the vertical direction (such as directly above the chips) due to the lack of effective reflection or refraction structures.

[0004] Therefore, there is an urgent need to provide a multi-layer diffusion optical system that breaks through the physical limitations of traditional optical path design and achieves uniform illumination from all angles.

[0005] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this invention, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that the present invention does not possess the features of these prior art. On the contrary, the present invention already possesses all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0006] In view of the shortcomings of the prior art, the present invention provides a composite light distribution module, lamp and lighting device, which aims to solve at least one or more technical problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides a composite light distribution module, comprising a first lens and a second lens arranged sequentially from the inside to the outside along the optical axis, wherein...

[0008] The first lens is positioned around the light source and has the following characteristics:

[0009] The first internal freeform surface has a surface facing the light source that is concave along the optical axis.

[0010] The first outer freeform surface and the first inner freeform surface form a first elliptical profile with decreasing thickness along the optical axis, and are constructed with a first light diffusion structure.

[0011] The second lens is fitted over the first lens and has the following characteristics:

[0012] The second inner freeform surface is set around the first outer freeform surface.

[0013] The second outer freeform surface and the second inner freeform surface form a second elliptical profile with increasing thickness along the optical axis.

[0014] Preferably, both the second inner freeform surface and the second outer freeform surface are elliptical profiles, wherein the major axis of the second outer freeform surface is parallel to the optical axis of the light source, and the major axis of the second inner freeform surface intersects the optical axis of the light source. This application adjusts the optical path by arranging the elliptical surfaces along different axes, allowing light from different directions to pass through lens portions of different thicknesses, thereby balancing the transmittance, reducing the problem of excessive brightness in the optical axis direction, and achieving uniformity in all directions.

[0015] Preferably, a second light diffusion structure is provided on the first inner freeform surface.

[0016] Preferably, the first light diffusion structure and / or the second light diffusion structure comprises a plurality of light diffusion microstructures arranged in an array.

[0017] Preferably, the density of the second light-diffusing microstructure array in the second light-diffusing structure is greater than the density of the first light-diffusing microstructure array in the first light-diffusing structure. This arrangement allows the light from the light source to pass through two layers of light-diffusing structures with different densities in sequence, which can more effectively and uniformly distribute the light and avoid localized areas that are too bright or too dark.

[0018] Preferably, the first light diffusion structure and / or the second light diffusion structure is any one of a sawtooth structure, a microlens, a groove, or a sphere, or a combination thereof.

[0019] Preferably, this application also relates to a lighting fixture, which includes:

[0020] Light sources, including multi-color linear light sources formed by alternating arrangements of various LED beads;

[0021] The composite light distribution module described in this application is arranged on the outer side of the light-emitting multicolor linear light source;

[0022] Heat sink, with the light source attached to it.

[0023] Preferably, the light source includes multiple multicolor linear light sources, which are symmetrical about the heat sink or distributed at a set angle.

[0024] Preferably, this application also relates to a lighting device, which includes:

[0025] The lighting fixture described in this application;

[0026] A lampshade is placed around the outer perimeter of a light fixture.

[0027] Preferably, the inner side of the lampshade is provided with a third light diffusion structure with a textured pattern.

[0028] The beneficial technical effects of this utility model include: through the nested design of the first lens and the second lens, the first lens expands the initial emission angle of the light source, thereby eliminating the illuminance blind zone in the direction perpendicular to the optical axis; while the second lens compensates for light intensity attenuation through gradient thickness, reducing the illuminance difference in the circumference of the lamp, thereby making the light intensity distribution uniform; the inner and outer light diffusion structures set on the first lens can enhance the secondary light distribution effect and improve the diffusion angle and distribution uniformity of the light. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a structural cross-sectional view of the lighting device provided in this embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the optical path of the first lens provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the luminous intensity of the first lens provided in this embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the first lens provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the optical path of the second lens provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the wall thickness variation of the second lens provided in this embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the luminous intensity of the second lens provided in an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1: First lens; 11: First outer freeform surface; 12: First inner freeform surface; 111: First light diffusion structure; 121: Second light diffusion structure; 2: Second lens; 21: Second outer freeform surface; 22: Second inner freeform surface; 3: Light source; 4: Heat sink; 5: Lampshade; O: Optical axis; FL: First ray; SL: Second ray. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this embodiment clearer, the technical solutions of this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, not all embodiments. Based on the embodiments in this embodiment, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] The composite light distribution module, luminaire, and lighting device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0043] like Figures 1 to 7 As shown in the figure, this application discloses a composite light distribution module, a luminaire, and a lighting device. The luminaire includes a light source 3 and a composite light distribution module arranged around the light source 3. The lighting device includes a heat sink 4, the light source 3, the composite light distribution module, and a lampshade 5 arranged sequentially from the inside out.

[0044] According to a preferred embodiment, the light source 3 can be composed of two or more LED beads with different spectra (i.e., colors). Specifically, a plurality of LED beads are arranged alternately in a linear light source. Preferably, LED beads with multiple spectra (colors) can provide rich scene variations. As an example, multi-color LED beads can provide rainbows or color gradients. It is understood that dynamic effects such as running horses can be achieved by setting a computer program to control the LED beads in the linearly arranged light source. Furthermore, the alternating arrangement of LED beads of different colors can achieve a uniform distribution of different colors in different scenes.

[0045] In this embodiment, the light source 3 may include two or more multicolor linear light sources, which surround the heat sink 4. Specifically, if the light source 3 includes two multicolor linear light sources, these two multicolor linear light sources are arranged symmetrically about the heat sink 4. Alternatively, if the light source 3 includes three or more multicolor linear light sources, these three or more multicolor linear light sources may be distributed at equal angles about the heat sink 4 (e.g., three multicolor linear light sources arranged in an equilateral triangle). It is understood that the above description of the arrangement of the multicolor linear light sources in the light source 3 is only a preferred example and not a specific limitation on the structure of this application. In other embodiments, the light source 3 may include only one multicolor linear light source. Alternatively, multiple multicolor linear light sources may be asymmetrically distributed about the heat sink 4.

[0046] According to a preferred embodiment, the first lens 1 provided in this application surrounds the radially outer side of the light source 3. For example... Figure 2 and Figure 4 As shown, the cross-sectional shape of the first lens 1 is approximately elliptical. The first lens 1 includes a first outer freeform surface 11 and a first inner freeform surface 12 located inside the first outer freeform surface 11. Along the optical axis (O) of the light source 3, the two opposing surfaces of the first inner freeform surface 12 are far apart from each other with respect to the light source 3. In other words, along the optical axis of the light source 3, the portion of the first inner freeform surface 12 facing the light source 3 is concave. Thus, the first outer freeform surface 11 and the first inner freeform surface 12 constitute a lens structure that is thin along the optical axis (O) (or normal) of the light source 3 and thick perpendicular to the optical axis (O) (or normal) of the light source 3.

[0047] Furthermore, such as Figure 2 and Figure 4 As shown, a first light diffusion structure 111 is provided on the first outer freeform surface 11 of the first lens 1. In this embodiment, the first light diffusion structure 111 is constructed as a sawtooth structure. This configuration allows light emitted from the light source 3 to be refracted inside the first lens 1 and diverged to both sides, then propagates in a straight line inside the lens, reaches the outer surface of the lens, and is then refracted at a large angle by the first light diffusion structure 111 on the outer surface.

[0048] As an example, combined Figures 2 to 4The light emitted by the light source 3 can be broadly divided into a first ray FL that deviates from the optical axis (O) and extends to both sides, and a second ray SL that extends approximately along the optical axis (O). Specifically, the first ray FL emitted by the light source 3 deviates from the optical axis (O) and extends to both sides towards the first inner freeform surface 12 of the first lens 1. The first ray FL is refracted by the first inner freeform surface 12 and diverges to both sides. The first ray FL propagates in a straight line inside the lens and extends to the first outer freeform surface 11 of the first lens 1. The first ray FL reaches the first outer freeform surface 11 and diffuses to both sides at a large angle by means of the first light diffusion structure 111 provided thereon.

[0049] On the other hand, the second light ray SL emitted by the light source 3 is directed approximately along the optical axis (O) towards the first inner freeform surface 12 of the first lens 1. The second light ray SL travels through the first inner freeform surface 12 and directly onto the first outer freeform surface 11 inside the lens. The second light ray SL undergoes total internal reflection through the first light diffusion structure 111 on the first outer freeform surface 11, thus diverging from the optical axis (O) to both sides. This portion of the second light ray SL is then diffused out at a large angle by the first light diffusion structures 111 on both sides of the first lens 1. Therefore, the mixing of the first light ray FL and the second light ray SL ensures that light is emitted throughout the entire circumference of the first lens 1. This application solves the problem of dark areas in the direction perpendicular to the optical axis (O) of the LED lamp bead through the design of the thickness of the first lens 1, the inner and outer freeform surfaces, and the light diffusion structure.

[0050] Figure 3 A schematic diagram of the luminous intensity of the first lens 1 provided in this application is shown. It can be seen from the luminous intensity distribution of the first lens 1 that the luminous angle of the first lens 1 is greater than 120°. Through the structural design of the first lens 1, the luminous angle of the light emitted by the light source 3 is diffused from 120° to 140° to 160°.

[0051] It is understandable that, in order to achieve the purpose of refracting light at a large angle according to the law of refraction, the first light diffusion structure 111 disposed on the first outer freeform surface 11 of the first lens 1 is not limited to the sawtooth structure described above. As an example, the first light diffusion structure 111 can also be any one of a microlens, a groove, or a sphere, or a combination thereof.

[0052] According to a preferred embodiment, such as Figure 4As shown, a second light diffusion structure 121 may be provided on the first inner freeform surface 12 of the first lens 1. This second light diffusion structure 121 is configured to diffuse the first light FL emitted by the light source 3 to both sides. Preferably, the second light diffusion structure 121 is constructed as a sawtooth structure. In this embodiment, the density of the second light diffusion microstructure array contained in the second light diffusion structure 121 is greater than the density of the first light diffusion microstructure array contained in the first light diffusion structure 111. For example, the array density of multiple sawtooth structures in the second light diffusion structure 121 is greater than the array density of multiple sawtooth structures in the first light diffusion structure 111. Therefore, the light emitted by the light source 3 can form a primary light distribution via the second light diffusion structure 121 on the first inner freeform surface 12, and then form a secondary light distribution via the first light diffusion structure 111 on the first outer freeform surface 11.

[0053] In this application, the first lens 1 can be made of any one or more of plastic, silicone, or glass.

[0054] According to a preferred embodiment, the second lens 2 provided in this application surrounds the radially outer side of the first lens 1. For example... Figure 4 As shown, the second lens 2 has an elliptical or approximately elliptical freeform surface shape. Specifically, the second lens 2 includes a second inner freeform surface 22 surrounding the first lens 1 and a second outer freeform surface 21 located radially outside the second inner freeform surface 22. In this embodiment, the second outer freeform surface 21 and the second inner freeform surface 22 have elliptical contours, and their major and minor axes are perpendicular to each other.

[0055] Specifically, the major axis of the second inner freeform surface 22 intersects the optical axis (O) of the light source 3. Preferably, see... Figure 5 The major axis of the second inner freeform surface 22 is perpendicular to the optical axis (O) of the light source 3. The minor axis of the second inner freeform surface 22 is parallel to the optical axis (O) of the light source 3. Preferably, see... Figure 5 The minor axis of the second inner freeform surface 22 is parallel to the optical axis (O) of the light source 3. On the other hand, the major axis of the second outer freeform surface 21 is parallel to the optical axis (O) of the light source 3. Preferably, see [reference needed]. Figure 5 The major axis of the second outer freeform surface 21 is parallel to the optical axis of the light source 3. The minor axis of the second outer freeform surface 21 intersects the optical axis (O) of the light source 3. Preferably, see... Figure 5 The short axis of the second external freeform surface 21 is perpendicular to the optical axis (O) direction of the light source 3.

[0056] This configuration results in the second lens 2 having the following wall thickness characteristics: it is thickest along the optical axis (O) of the light source 3 and thinnest along the direction perpendicular to the optical axis (O) of the light source 3. Its thickness variation is as follows: Figure 6 As shown. Furthermore, the wall thickness variation of the second lens 2 can be characterized by the following formula:

[0057]

[0058] In the formula, T is the wall thickness of the second lens 2, a is the semi-major axis value of the second inner freeform surface 22, b is the semi-minor axis value of the second inner freeform surface 22, c is the semi-minor axis value of the second outer freeform surface 21, d is the semi-major axis value of the second outer freeform surface 21, and θ is the angle between the line connecting the second outer freeform surface 21 and the second inner freeform surface 22 passing through the center of the ellipse and the semi-major axis of the second inner freeform surface 22 or the semi-minor axis of the second outer freeform surface 21.

[0059] By setting the second lens 2 as a non-uniform thickness lens that is thicker along the optical axis (O) of the light source 3 and thinner perpendicular to the optical axis (O), the light emitted through the optical axis (O) of the light source 3 is significantly attenuated, while the light loss through the direction perpendicular to the optical axis (O) of the light source 3 is less, resulting in less light attenuation. This ensures that the illuminance in the circumferential direction of the second lens 2 is nearly uniform. It is understandable that since the transmittance of light passing through a diffusion material of different thicknesses decreases with increasing thickness, the variation in thickness can effectively transform the light intensity into a uniform light intensity in each direction, thus ensuring the same illuminance in every direction and solving the problem of uneven light illuminance.

[0060] Figure 7 A schematic diagram of the luminous intensity of the second lens 2 provided in this application is shown. From the simulation results of the luminous intensity of the second lens 2, it can be seen that the luminous intensity of the second lens 2 in each direction is basically equal.

[0061] In this application, the second lens 2 is made of PMMA / PC or other optical materials containing diffusing particles. The diffusing particles inside the second lens 2 have the effect of homogenizing light.

[0062] In summary, this application provides a composite light distribution module, which includes a first lens 1 and a second lens 2 arranged sequentially from the inside to the outside along the optical axis (O) of the light source 3. The first lens 1 is arranged around the light source 3 and has a first inner freeform surface 12 and a first outer freeform surface 11. The surface of the first inner freeform surface 12 facing the light source 3 is concave along the optical axis (O). The first outer freeform surface 11 and the first inner freeform surface 12 form a first elliptical profile with decreasing thickness along the optical axis (O). The first outer freeform surface 11 is provided with a first light diffusion structure 111. The second lens 2 is sleeved on the outside of the first lens 1 and has a second inner freeform surface 22 and a second outer freeform surface 21. The second inner freeform surface 22 is arranged around the first outer freeform surface 11. The second outer freeform surface 21 and the second inner freeform surface 12 form a second elliptical profile with increasing thickness along the optical axis (O).

[0063] According to a preferred embodiment, this application also relates to a lighting device, which may include the lamp and lampshade 5 as described above. Specifically, as Figure 1 As shown, the light source 3 is directly or indirectly attached to the heat sink 4, and multiple light sources 3 can be arranged in an array about the heat sink 4.

[0064] The lampshade 5 is arranged radially outward of the second lens 2 and is designed as an external component with uniform wall thickness. Further, a third light diffusion structure (not shown in the figure) may be provided on the inner side of the lampshade 5. In this embodiment, the third light diffusion structure is constructed as a textured structure. Specifically, the lampshade 5 is designed as a dark gray plastic shell with a textured inner side and a glossy outer side, exhibiting uniform wall thickness. The dark gray color serves to shield and prevent exposure of internal optical components; the high-gloss outer surface ensures transparency; and the textured inner side further promotes uniform light distribution. It is understood that numerous prior art details regarding the heat sink 4 and the lampshade 5 have been disclosed, and to avoid redundancy, they are not described in detail.

[0065] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0066] Finally, it should be noted that this application specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. Although the embodiments have been described in detail with reference to the foregoing examples, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. This application specification contains multiple inventive concepts, and phrases such as "preferredly," "according to a preferred embodiment," or "optionally" indicate that the corresponding paragraph discloses an independent concept. The applicant reserves the right to file divisional applications based on each inventive concept.

Claims

1. A composite light distribution module, characterized in that, It includes a first lens (1) and a second lens (2) arranged sequentially from the inside to the outside along the optical axis (O), wherein, The first lens (1) is arranged around the light source (3) and has the following characteristics: The first inner freeform surface (12) has a concave surface facing the light source (3) along the optical axis (O). The first outer freeform surface (11) and the first inner freeform surface (12) form a first elliptical profile with decreasing thickness along the optical axis (O) direction, and are constructed with a first light diffusion structure (111). The second lens (2) is fitted outside the first lens (1) and has the following characteristics: The second inner freeform surface (22) is set around the first outer freeform surface (11). The second outer freeform surface (21) and the second inner freeform surface (22) form a second elliptical profile with increasing thickness along the optical axis (O).

2. The composite light distribution module according to claim 1, characterized in that, Both the second inner freeform surface (22) and the second outer freeform surface (21) are elliptical profiles. The major axis of the second outer freeform surface (21) is parallel to the optical axis (O) of the light source (3), and the major axis of the second inner freeform surface (22) intersects the optical axis (O) of the light source (3).

3. The composite light distribution module according to claim 1, characterized in that, A second light diffusion structure (121) is provided on the first inner freeform surface (12).

4. The composite light distribution module according to claim 3, characterized in that, The first light diffusion structure (111) and / or the second light diffusion structure (121) contain a plurality of light diffusion microstructures arranged in an array.

5. The composite light distribution module according to claim 4, characterized in that, The density of the second light diffusion microstructure array contained in the second light diffusion structure (121) is greater than the density of the first light diffusion microstructure array contained in the first light diffusion structure (111).

6. The composite light distribution module according to claim 3 or 5, characterized in that, The first light diffusion structure (111) and / or the second light diffusion structure (121) are any one of a sawtooth structure, a microlens, a groove or a sphere, or a combination thereof.

7. A lamp, characterized in that, include: The light source (3) includes a multi-color linear light source formed by alternating arrangement of various LED beads; The composite light distribution module according to any one of claims 1 to 6 is arranged outside the light-emitting side of the multicolor linear light source; Heat sink (4), the light source (3) is attached to the heat sink (4).

8. The lamp according to claim 7, characterized in that, The light source (3) includes multiple multicolor linear light sources, which are symmetrical about the heat sink (4) or distributed at a set angle.

9. A lighting device, characterized in that, include: The luminaire according to claim 7 or 8; A lampshade (5) is placed around the outside of the lamp.

10. The lighting device according to claim 9, characterized in that, The inner side of the lampshade (5) is provided with a third light diffusion structure with a textured surface.

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