Rayleigh scattering light guide plate, rayleigh scattering blue sky module and sky lamp

Abstract

The application relates to the technical field of lamps, in particular to a Rayleigh scattering light guide plate, a Rayleigh scattering blue sky module and a sky lamp. The Rayleigh scattering light guide plate comprises a plate body, Rayleigh scattering particles are scattered in the plate body, a light inlet surface is formed on the side surface of the plate body, a light outlet surface is formed on the front surface of the plate body, and a light reflection surface is formed on the back surface of the plate body, wherein the light outlet surface is a flat surface, the light reflection surface is provided with a plurality of micro convex parts, and the micro convex parts form a textured surface on the light reflection surface. According to the application, the light outlet efficiency of the Rayleigh scattering light guide plate can be improved while the light transmission quality of the plate body is ensured, and the use experience of users is met.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, and in particular to a Rayleigh scattering light guide plate, a Rayleigh scattering blue sky module, and a sky light. Background Technology

[0002] For lighting fixtures, simulating natural light is the biggest challenge. As a lighting fixture that simulates the visual effect of the sky, the Skylight can provide a skylight-like lighting effect for indoor spaces that cannot be illuminated by sunlight.

[0003] Existing skylights generally utilize a light source to illuminate a Rayleigh diffuser plate to achieve a simulated sky visual effect. These lights typically improve luminous efficacy by adjusting the thickness or arrangement of the Rayleigh diffuser plate. However, while these methods ensure luminous efficacy, they often suffer from uneven light output, noticeable light spots, or high manufacturing difficulty, making it impossible to simultaneously guarantee both luminous efficacy and light output quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a Rayleigh scattering light guide plate, a Rayleigh scattering blue sky module, and a sky light, which can improve the light output efficiency of the Rayleigh scattering light guide plate while ensuring the light transmission quality of the plate, thus meeting the user's needs for a better experience.

[0005] To solve the above-mentioned technical problems, the first aspect of the present invention provides a Rayleigh scattering light guide plate, including a plate body, wherein Rayleigh scattering particles are dispersed inside the plate body, a light incident surface is formed on the side of the plate body, a light emitting surface is formed on the front of the plate body, and a reflective surface is formed on the back of the plate body, wherein the light emitting surface is a flat surface, and the reflective surface is formed with a plurality of micro-protrusions, wherein the plurality of micro-protrusions form a textured surface on the reflective surface.

[0006] As an improvement to the above solution, the textured surface is a wavy curved surface, and the wavy curved surface extends along the length direction and / or width direction of the plate.

[0007] As an improvement to the above scheme, the cross-sectional shape of the wavy surface is a sine wave curve and / or a quasi-sine wave curve.

[0008] As an improvement to the above solution, the wavy surface includes a first surface and a second surface. The first surface extends along the length direction of the plate, and the second surface extends along the width direction of the plate. The cross-sectional shape of the first surface is a sinusoidal curve, and the cross-sectional shape of the second surface is a sinusoidal curve.

[0009] As an improvement to the above scheme, auxiliary scattering particles are also dispersed within the plate body. The particle size of the auxiliary scattering particles is a first particle size, and the particle size of the Rayleigh scattering particles is a second particle size. The first particle size is larger than the second particle size.

[0010] As an improvement to the above scheme, the first particle size is 100nm-5μm, and the second particle size is 10nm-120nm.

[0011] As an improvement to the above scheme, the mass percentage of the Rayleigh scattering particles in the plate is 0.2%-2.5%, and the mass percentage of the auxiliary scattering particles in the plate is 0-1.0%.

[0012] As an improvement to the above scheme, the Rayleigh scattering particles are titanium dioxide (TiO2), and the auxiliary scattering particles are organic particles and / or inorganic particles.

[0013] Accordingly, a second aspect of the present invention provides a Rayleigh scattering blue sky module, including a frame, a light source, and a Rayleigh scattering light guide plate as described in any one of the above claims. The light source is disposed on the inner wall of the frame, the Rayleigh scattering light guide plate is installed in the inner cavity of the frame, and the light-emitting surface of the light source faces the light-incident surface of the side of the Rayleigh scattering light guide plate.

[0014] Accordingly, a third aspect of the present invention provides a sky light comprising the Rayleigh scattering light guide plate described in any of the above claims, or comprising the Rayleigh scattering blue sky module described in the above claims.

[0015] Implementing this invention has the following beneficial effects: In this embodiment of the Rayleigh scattering light guide plate, after light enters the plate from the light-incident surface on the side of the plate, the light comes into contact with Rayleigh scattering particles, and after being scattered by the Rayleigh scattering particles and propagating multiple times inside the plate, some of the light can escape from the light-emitting surface on the front of the plate, achieving the effect of a blue sky on the light-emitting surface of the plate; at the same time, using a flat light-emitting surface as the main light-emitting surface can enable the Rayleigh scattering light guide plate to maintain good interface flatness and transparency, thereby ensuring the light transmission quality of the plate.

[0016] In addition, some light can be reflected onto the reflective surface on the back of the board. Since the multiple micro-protrusions of the reflective surface combine to form a textured surface, compared with a flat reflective surface, the light can be scattered or deflected at multiple angles when reflected onto the textured surface. This allows some of the light that originally needed to be repeatedly reflected back on the board to change the reflection angle and be projected onto the light-emitting surface, effectively increasing the probability of light escaping from the light-emitting surface, thereby improving the overall scattering efficiency and the light emission efficiency of the board.

[0017] Furthermore, by combining a flat light-emitting surface with a textured reflective surface, it is possible to improve the light output efficiency of the Rayleigh scattering light guide plate while ensuring the light transmission quality of the plate, thus meeting the user's needs for a better experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the Rayleigh scattering light guide plate in this invention; Figure 2 is a schematic diagram of the three-dimensional model of the wavy surface in this invention; Figure 3 is a schematic diagram of the first curved surface in the XZ section of the present invention; Figure 4 is a graph showing the amplitude variation trend of the first curved surface as the light irradiation distance increases in this invention; Figure 5 is a graph showing the periodic variation trend of the first curved surface as the light irradiation distance increases in this invention; Figure 6 is a schematic diagram of the second surface in the yZ section of this invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside, and outside used in this text are based solely on the accompanying drawings and are not intended to specifically limit the invention.

[0020] The first aspect of this invention provides a Rayleigh scattering light guide plate, such as... Figure 1 As shown, the Rayleigh scattering light guide plate includes a plate body 1, Rayleigh scattering particles 101 are scattered inside the plate body 1, a light incident surface 11 is formed on the side of the plate body 1, a light emitting surface 12 is formed on the front of the plate body 1, and a reflective surface 13 is formed on the back of the plate body 1. The light emitting surface 12 is a flat surface, and the reflective surface 13 has multiple micro-protrusions, which form a textured surface on the reflective surface 13.

[0021] In this embodiment, the Rayleigh scattering light guide plate illuminates the plate 1 from the light-incident surface 11 on the side of the plate 1. After the light enters the plate 1, it comes into contact with Rayleigh scattering particles 101 and is scattered by the Rayleigh scattering particles 101 and propagates multiple times inside the plate 1. Some of the light can then escape from the light-emitting surface 12 on the front of the plate 1, achieving a blue sky effect on the light-emitting surface 12 of the plate 1. At the same time, by using the flat light-emitting surface 12 as the main light-emitting surface, the Rayleigh scattering light guide plate can maintain good interface flatness and transparency, thereby ensuring the light transmission quality of the plate 1.

[0022] In addition, some of the light can be reflected onto the reflective surface 13 on the back of the plate 1. Since the multiple micro-protrusions of the reflective surface 13 combine to form a textured surface, compared with the flat reflective surface 13, the light can be scattered or deflected at multiple angles when reflected onto the textured surface. This allows some of the light that originally needed to be repeatedly refracted back and forth on the plate 1 to change the reflection angle and be projected onto the light-emitting surface 12, effectively increasing the probability of light escaping from the light-emitting surface 12, thereby improving the overall scattering efficiency and the light emission efficiency of the plate 1.

[0023] Furthermore, by combining the flat light-emitting surface 12 and the textured reflective surface 13, it is possible to improve the light output efficiency of the Rayleigh scattering light guide plate while ensuring the light transmission quality of the plate 1, thus satisfying the user's experience.

[0024] As a preferred embodiment, as shown in Figure 2, the textured surface is a wavy curved surface, which extends along the length and / or width of the plate 1. As an inclined surface with continuously changing curvature, when light is reflected to the inclined surface at different angles in the textured surface, the reflection angle of the light changes, thereby breaking the original total internal reflection path and ensuring that the probability of light being guided to the light-emitting surface 12 is increased. This improves the overall scattering efficiency and makes the light-emitting surface 12 more uniform in its light distribution, reducing the occurrence of local bright spots, light spots, or dark areas on the light-emitting surface 12 of the plate 1, and further improving the visual comfort of the Rayleigh scattering light guide plate when emitting light.

[0025] It should be noted that the textured surface of the wavy curved surface can be printed using a mold. The mold can be a high-precision metal mold processed by CNC engraving or laser engraving, and the structural surface of the mold can be roughened by sandblasting, chemical etching, or atomized coating, or a microparticle coating can be embedded in the mold to form a wavy structural surface. Subsequently, during the injection molding or hot pressing process of the plate 1, materials such as PMMA and PC are formed in the mold, thereby replicating the shape of the wavy structural surface of the mold on the back of the plate 1, forming the textured surface shape of the wavy curved surface.

[0026] Specifically, as shown in Figures 2, 3 and 6, the cross-sectional shape of the wavy surface is a sine wave curve and / or a quasi-sine wave curve. By adjusting the curvature parameters of the sine wave curve and / or the quasi-sine wave curve (such as adjusting the amplitude and period of the surface), the curvature can be continuously changed, avoiding optical defects and facilitating the formation of a gradual distribution of the wavy surface, further ensuring the brightness uniformity of the light-emitting surface 12 of the plate 1.

[0027] As a specific embodiment, the wavy surface includes a first surface and a second surface. The first surface extends along the length of the plate 1, and the second surface extends along the width of the plate 1. The cross-sectional shape of the first surface is a sinusoidal curve, and the amplitude and period of the first surface gradually decrease along the incident direction of the light, achieving gradual control of the surface structure. This ensures that when light first enters the plate 1, near the incident light segment region, the large amplitude, long period, and low density result in weaker scattering of light by the microstructures in this region. Conversely, away from the incident light segment region, the small amplitude, short period, and high density result in stronger scattering of light by the microstructures in this region, effectively compensating for energy attenuation during light transmission and achieving dynamic compensation for the overall brightness of the plate. The second surface, with its sinusoidal cross-sectional shape, ensures uniform diffusion of light along the width of the plate 1, further guaranteeing uniform light output.

[0028] Furthermore, the functional expression formula for a wavy surface can be:

[0029] in, Let be the two-dimensional spatial coordinates of the bottom surface of plate 1; This represents the height of the microstructure at the corresponding coordinate point; The initial amplitude, The range is 50-500 μm; For the initial period, 100-1000μm; The periodic decay coefficient, for k is the amplitude attenuation coefficient. for .

[0030] The wavy surface formed using this formula can be created in the Y-direction where the waveform changes periodically with an initial period while the amplitude gradually decreases, thus forming a sinusoidal curve with exponentially decreasing amplitude in the Y-direction. In the X-direction, the wavelength forms a quasi-sine wave curve with a gradually decreasing period and gradually decreasing amplitude. The expression for the amplitude decay trend is: The expression for periodic decay is: As shown in Figures 4 and 5.

[0031] This allows the wavy surface to gradually change from sparse to dense and from high to low in the X direction, and from equidistant but with decreasing amplitude in the Y direction. This ensures that the wavy surface can match the light attenuation characteristics, enabling slight light guidance in the near-light source area and compensating for insufficient light intensity in the far-light source area by increasing the number of microstructures per unit area. This achieves gradual control of the surface structure, ensuring that the light scattering energy in each area is close to the required amount, significantly alleviating the problems of short light guiding distance and uneven light guiding, and improving the light-emitting surface 12 effect and light emission uniformity of the plate.

[0032] As another optional embodiment, such as Figure 1As shown, auxiliary scattering particles 102 are also dispersed within the plate 1. The particle size of the auxiliary scattering particles 102 is a first particle size, and the particle size of the Rayleigh scattering particles 101 is a second particle size, with the first particle size being larger than the second particle size. When light enters the plate 1 from the light-incident surface 11, the Rayleigh scattering particles 101 provide Rayleigh scattering, enabling high-frequency, small-angle scattering of short-wavelength light (such as blue light). Since the particle size of the auxiliary scattering particles 102 is larger than that of the Rayleigh scattering particles 101, light can undergo Mie scattering upon contact with the auxiliary scattering particles 102. Furthermore, by utilizing the auxiliary scattering particles 102 in conjunction with the Rayleigh scattering particles 101, a multi-scale, multi-mechanism synergistic light scattering structure is formed within the plate 1, enhancing the disturbance of light within the Rayleigh scattering light guide plate, thereby improving the light emission efficiency and enhancing the directional distribution and brightness uniformity of the emitted light.

[0033] Specifically, the first particle size is 100nm-5μm, which ensures that the auxiliary scattering particles 102 can produce Mie scattering of light, and the second particle size is 10nm-120nm, which ensures that the Rayleigh scattering particles 101 can produce Rayleigh scattering of light. Optionally, the first particle size can be 100nm-200nm, 100nm-500nm, 200nm-1μm, or 0.5μm-5μm; the second particle size can be 10nm-50nm to achieve efficient scattering of blue light; the second particle size can be 50nm-80nm to achieve uniform light mixing; the second particle size can also be 80nm-120nm to enhance brightness and improve light extraction efficiency.

[0034] Furthermore, it should be noted that the Rayleigh scattering light guide plate achieves high luminous efficiency by doping Rayleigh scattering particles 101 and various auxiliary scattering particles 102 into the PMMA matrix. The Rayleigh scattering light guide plate can be manufactured using injection molding, foundation casting, and pouring processes. When manufacturing the plate body 1, it is essential to ensure that the production workshop is a cleanroom with a cleanliness level of at least 100,000 to control the impact of airborne particles on the product's surface quality and optical performance. For example, when using an extrusion process, the production process can include raw material preparation, mixing, drying, feeding, extrusion plasticizing, die extrusion molding, edge pressing, cooling, traction, trimming, cutting, and inspection and packaging.

[0035] More specifically, Rayleigh scattering particles 101 constitute 0.2%-2.5% of the mass of the plate 1 to reduce the transmittance of harmful light waves to a range that is eye-friendly and does not cause color distortion, while maintaining the high transmittance and clarity of the plate 1. Auxiliary scattering particles 102 constitute 0-1.0% of the mass of the plate 1 to ensure that the light is repeatedly dispersed and mixed during propagation, eliminating lamp shadows and further ensuring uniform brightness.

[0036] As a specific embodiment, Rayleigh scattering particles 101 are titanium dioxide (TiO2) with a particle size of 10nm-120nm and a refractive index of 2.5-2.7. Auxiliary scattering particles 102 are organic and / or inorganic particles. Specifically, auxiliary scattering particles 102 can be inorganic particles such as SiO2 (particle size 200nm-1μm, refractive index 1.45), Al2O3 (particle size 100nm-500nm, refractive index 1.62-1.77), ZnO (particle size 100nm-200nm, refractive index 1.9-2.1), and BaSO4 (diameter 0.5μm-5μm, refractive index 1.65), or organic particles such as polyphenylene sulfide (PPS) and PMMA-PS core-shell particles.

[0037] Below are three specific example solutions for Rayleigh scattering light guide plates, based on the above content.

[0038] In Scheme 1, a transparent PMMA substrate is used to fabricate the light guide plate, and titanium dioxide (TiO2) is doped into the plate body 1 during fabrication to act as Rayleigh scattering particles 101. The side of the light guide plate is the incident light surface 11, the upper surface is a smooth surface serving as the main light emitting surface 12, and the lower surface is a microstructured frosted surface serving as an auxiliary scattering surface. The microstructured frosted surface exhibits a quasi-sine wave curve along the length of the plate body 1 and a sine wave curve along the width of the plate body 1. By combining the microstructured frosted surface and the smooth light emitting surface 12, a single-sided microstructured light guide plate is formed, increasing the probability of light escape. This achieves improved light extraction efficiency of the Rayleigh scattering light guide plate while maintaining the light transmission quality of the plate body 1, thus satisfying the user's experience.

[0039] In Scheme 2, a transparent PMMA substrate is used to fabricate the light guide plate. During the fabrication of the light guide plate, titanium dioxide (TiO2) is doped into the plate body 1 as Rayleigh scattering particles 101, while SiO2, Al2O3, etc. are doped as auxiliary scattering particles 102. The mass percentage of Rayleigh scattering particles 101 is adjusted to 0.2%-2.5%, and the mass percentage of auxiliary scattering particles 102 is 0-1.0%, forming a multi-particle scattering light guide plate. By utilizing the combination of Rayleigh scattering particles 101 and auxiliary scattering particles 102, the light emission efficiency is improved, and the direction distribution and brightness uniformity of the emitted light are enhanced.

[0040] In Scheme 3, a transparent PMMA substrate is used to fabricate the light guide plate. During the fabrication of the light guide plate, titanium dioxide (TiO2) is doped into the plate body 1 as Rayleigh scattering particles 101, while SiO2 and Al2O3 are doped as auxiliary scattering particles 102. The mass percentage of Rayleigh scattering particles 101 is adjusted to 0.2%-2.5%, and the mass percentage of auxiliary scattering particles 102 is 0-1.0%. The side of the light guide plate is the incident light surface 11, the upper surface is a smooth surface serving as the main light emitting surface 12, and the lower surface is a microstructured frosted surface serving as the auxiliary scattering surface. The microstructured frosted surface exhibits a sinusoidal curve along the length of the plate body 1 and a sinusoidal curve along the width of the plate body 1. By utilizing the optimized combination of single-sided microstructure and multi-particle scattering, the optical performance of the light guide plate can be further improved while maintaining a simple fabrication process.

[0041] Furthermore, to verify the luminous efficacy enhancement effect of the Rayleigh scattering light guide plate provided by this invention, a standardized test experiment was conducted on the optimized Rayleigh scattering light guide plate formed in Scheme 3 above and the ordinary Rayleigh scattering light guide plate. The test was conducted in a well-shaded dark room to eliminate ambient light interference and ensure the accuracy and repeatability of the measurement results. The test device was a 300*600mm mirrored aluminum frame with 7500K LED beads fixed on the side. High-efficiency Rayleigh scattering light guide plates and ordinary Rayleigh scattering light guide plates, both with a size of 300*300mm, were placed in the frame simultaneously. The test instrument was a dual-color cloud spectrum HPC350B spectroradiometer. During the test, the photosensitive surface of the radiometer was kept parallel to the light-emitting surface 12 of the light guide plate, with a fixed distance of 20mm. Nine equidistant test points were selected within the light-emitting surface 12 area of ​​each light guide plate, arranged in a 3×3 grid, covering the central and edge areas as shown in Figure 5. The illuminance value of each point was recorded separately for subsequent uniformity analysis. The measured data are shown in the table below.

[0042]

[0043] Table 1. Standardized Test Experiment Data According to actual measurement data, under the same input conditions, the Rayleigh scattering light guide plate using Scheme 3 increased the illuminance value by about 58.6% compared with the ordinary plate, and the uniformity of illuminance distribution was higher. This indicates that the present invention not only significantly improves the light efficiency, but also improves the uniformity of light emission, and the color rendering index is also improved to a certain extent.

[0044] Accordingly, a second aspect of the present invention provides a Rayleigh scattering blue sky module, which includes a frame, a light source, and a Rayleigh scattering light guide plate as described in any of the above embodiments. The light source is disposed on the inner wall of the frame, and the Rayleigh scattering light guide plate is installed in the inner cavity of the frame, with the emitting surface of the light source facing the light incident surface 11 on the side of the Rayleigh scattering light guide plate. The Rayleigh scattering blue sky module possesses all the beneficial effects of the Rayleigh scattering light guide plate in the above embodiments, which will not be repeated here. Furthermore, by integrating the Rayleigh scattering light guide plate, the light source, and the frame as described in the above embodiments into a Rayleigh scattering blue sky module, there is no need to arrange a reflective plate at the reflective surface 13 position on the back of the Rayleigh scattering light guide plate, or the thickness of the reflective plate can be reduced, effectively reducing the overall thickness of the blue sky module, making the lamp easier to install while reducing the cost of the mold.

[0045] Accordingly, a third aspect of the present invention provides a skylight, which includes the Rayleigh scattering light guide plate described in any of the above embodiments, or the skylight includes the Rayleigh scattering blue sky module described above. The skylight possesses all the beneficial effects of the Rayleigh scattering light guide plate and the blue sky module described in the above embodiments, which will not be repeated here.

[0046] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A Rayleigh scattering light guide plate, characterized in that, The plate includes a plate body, the interior of which Rayleigh scattering particles are dispersed. The side of the plate body forms a light-incident surface, the front of the plate body forms a light-emitting surface, and the back of the plate body forms a reflective surface. The light-emitting surface is a flat surface, and the reflective surface has multiple micro-protrusions, which together form a textured surface.

2. The Rayleigh scattering light guide plate as described in claim 1, characterized in that, The textured surface is a wavy curved surface, and the wavy curved surface extends along the length and / or width direction of the plate.

3. The Rayleigh scattering light guide plate as described in claim 2, characterized in that, The cross-sectional shape of the wavy surface is a sine wave curve and / or a quasi-sine wave curve.

4. The Rayleigh scattering light guide plate as described in claim 3, characterized in that, The wavy surface includes a first surface and a second surface. The first surface extends along the length direction of the plate, and the second surface extends along the width direction of the plate. The cross-sectional shape of the first surface is a sinusoidal curve, and the cross-sectional shape of the second surface is a sinusoidal curve.

5. The Rayleigh scattering light guide plate as described in claim 1, characterized in that, The plate also contains auxiliary scattering particles with a first particle size and Rayleigh scattering particles with a second particle size, wherein the first particle size is larger than the second particle size.

6. The Rayleigh scattering light guide plate as described in claim 5, characterized in that, The first particle size is 100nm-5μm, and the second particle size is 10nm-120nm.

7. The Rayleigh scattering light guide plate as described in claim 5, characterized in that, The Rayleigh scattering particles constitute 0.2%-2.5% of the mass of the plate, and the auxiliary scattering particles constitute 0-1.0% of the mass of the plate.

8. The Rayleigh scattering light guide plate as described in claim 5, characterized in that, The Rayleigh scattering particles are titanium dioxide (TiO2), and the auxiliary scattering particles are organic particles and / or inorganic particles.

9. A Rayleigh scattering blue sky module, characterized in that, The device includes a frame, a light source, and a Rayleigh scattering light guide plate as described in any one of claims 1 to 8. The light source is disposed on the inner wall of the frame, the Rayleigh scattering light guide plate is installed in the inner cavity of the frame, and the light-emitting surface of the light source faces the light-incident surface of the side of the Rayleigh scattering light guide plate.

10. A sky light, characterized in that, It includes the Rayleigh scattering light guide plate according to any one of claims 1 to 8, or the Rayleigh scattering blue sky module according to claim 9.

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