Reflection type lens and direct type panel lamp

Abstract

The invention relates to a reflection type lens and a direct type panel lamp, and aims to solve the technical problems that in the prior art, the number of lamp strips is large, assembly is complex, and light spots are uneven. The reflective lens comprises an arc seat and a cylinder, the bottom of the arc seat is sunken upwards to form a sunken area used for containing the LED light source, and the top of the sunken area is provided with a lower convex cambered surface which is in smooth transition from the center to the peripheral side; the cylinder and the arc seat are integrally formed and located on the top of the arc seat, a groove which is sunken downwards from the top of the cylinder is formed in the cylinder, the longitudinal section of the groove is in a V shape, and the inner side face of the groove is an outwards-protruding arc face. The direct type panel lamp comprises a high reflection type bottom shell, a lamp strip is arranged in the bottom shell, an LED light source on the lamp strip is provided with a reflection type lens, the two sides of the reflection type lens are arc-shaped, and the inner wall of the reflection type lens guides light rays to the diffusion plate. According to the design, through the synergistic effect of the reflective lens and the high-reflection bottom shell, the number of lamp strips and connecting wires is remarkably reduced, the assembly process is simplified, the light spot uniformity and the light utilization rate are improved, and the labor and material cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting fixtures, and in particular to a reflective lens and a direct-down panel lamp. Background Art

[0002] Currently, the mainstream optical design of direct-type panel lights (Backlight Unit, BLU) generally adopts a refractive lens structure. Its typical technical solutions are as follows:

[0003] In terms of optical structure, such as Figure 1 As shown, the LED light source 8 is fixed on the lamp board, and a large-angle refractive lens 5 is provided above each LED, with a half-intensity angle of about 170°. The light 7 is projected onto the diffuser 1 in front of the lamp through the refraction effect of the lens, ultimately achieving uniform light output.

[0004] In terms of light bar configuration, to ensure uniform light spot, conventional solutions require 5-8 light bars, while some simplified designs require at least 4. Each light bar is fixed to the lighting structure with adhesive and powered by wires in series.

[0005] The above solution has the following technical defects:

[0006] 1. Optical efficiency and height limitations. The optical path control capability of refractive lenses is limited by their physical structure. This makes it difficult to achieve uniform light spot quality with a small number of light strips, especially when the fixture height is limited (e.g., ≤30mm). To meet uniformity requirements, the number of light strips must be increased, resulting in a significant increase in cost (due to increased light strip material, adhesives, and wire).

[0007] 2. Assembly complexity and manufacturing costs. There are issues with securing multiple light strips. The increased number of light strips complicates the assembly process, requiring each strip to be glued to the structural components using white glue, increasing labor costs and material waste. Multiple light strips must be connected in series with wire, which exponentially increases the number of solder joints and wire usage, increasing the risk of failure and reducing production efficiency.

[0008] 3. Bottleneck of optical performance: Although large-angle refractive lenses can expand the coverage of the light beam, their ability to regulate the LED light intensity distribution is limited, making it difficult to achieve high uniformity within a limited height (especially in edge areas where light attenuation or uneven light spots are prone to occur). Summary of the Invention

[0009] The object of the present invention is to provide a reflective lens and a direct-down panel light to solve the technical problems in the prior art of a large number of light strips, complex assembly, and uneven light spots.

[0010] To achieve the above object, as one aspect of the present invention, a reflective lens is provided, comprising:

[0011] The arc seat is convex on the periphery, and the bottom of the arc seat is concave upward to form a concave area for accommodating the LED light source. The top of the concave area is provided with a downward convex arc surface that smoothly transitions from the center to the periphery;

[0012] The cylinder is integrally formed with the arc seat and is located on the top of the arc seat. A groove is provided in the cylinder and is recessed downward from the top of the cylinder. The longitudinal section of the groove is V-shaped, and the inner side of the groove is an outward convex arc surface.

[0013] The recessed area at the bottom of the arc seat is used to accommodate the LED light source, and the downward convex arc surface on the top is used to optimize light guidance. Combined with the design of the V-shaped groove inside the cylinder and the inner side of the convex arc surface, the optical path control capability is significantly improved. A highly uniform light spot can be achieved with a small number of light strips, thereby effectively reducing the number of light strips to reduce material and manufacturing costs. It also overcomes the defect of traditional refractive lenses in their limited ability to control light intensity distribution, and can achieve more uniform light output within a limited height, especially improving the light decay and uneven light spot problems in the edge area.

[0014] Furthermore, the top point of the cylinder is defined as A, the lowest point of the groove is defined as B, a virtual connecting line segment is formed between A and B, and the angle between the virtual connecting line segment and the horizontal plane is defined as a, then 29<a<32 degrees.

[0015] By limiting the angle a between the virtual connecting line segment and the horizontal plane to a specific range, the reflection angle and path distribution of light can be precisely controlled, ensuring that light emitted by the LED light source, after being reflected by the inner surface of the groove, evenly covers the target area. Angles within this range minimize light loss while maintaining light efficiency, preventing excessive light concentration or dispersion, thereby improving light spot uniformity and optimizing optical efficiency.

[0016] Furthermore, the height of the cylinder is d1, the height of the reflective lens is d2, the height of the reflective lens is d3, d2≦2d1, and d3<d4.

[0017] By limiting the overall height d2 of the reflective lens to no more than twice the height d1 of the cylinder, the light guiding performance can be optimized, ensuring efficient light path control in a limited space.

[0018] Preferably, d1 = 4.1 mm, d2 = 8.1 mm, d3 = 13.5 mm, and d4 = 16 mm.

[0019] The cylindrical height of 4.1mm ensures that the light path reflected from the inner side of the groove accurately covers the target area, reducing light energy loss.

[0020] The 4.1mm height forms a reasonable ratio with the 8.1mm total lens height (d2≈2d1), which not only meets the vertical space requirements of the reflective lens, but also adapts to the assembly limitations of ultra-thin panel lights.

[0021] The total height of the reflective lens is 8.1mm. At this height, the coordinated reflection path of the arc seat and the cylinder can efficiently guide the LED light, avoiding the uneven light spot caused by the insufficient height of traditional refractive lenses.

[0022] The 13.5mm width design and narrow lens width reduce the overlap difference of adjacent light beams, avoiding the problem of uneven edge light intensity caused by excessive width, especially improving the light decay phenomenon in the edge area of the panel light.

[0023] As another aspect of the present invention, a direct-down panel light is provided, comprising a highly reflective bottom shell, a diffuser plate being installed at an opening of the highly reflective bottom shell, a light bar being installed in the highly reflective bottom shell, the light bar comprising a circuit board, an LED light source being arrayed on the circuit board, the LED light source being mounted with the above-mentioned reflective lens, and the two side surfaces of the highly reflective bottom shell being curved.

[0024] Furthermore, the highly reflective bottom shell is provided with a through hole for the power line to pass through.

[0025] Furthermore, the highly reflective bottom shell includes a bottom plate and side walls connected around the bottom plate, the side walls surround the edge of the bottom plate to form a trumpet-shaped opening, the light bar is installed on the bottom plate, and the bottom plate and the side walls are formed as one piece.

[0026] The reflective lens and direct-down panel light provided by the present invention have the following advantages:

[0027] Through directional control, the reflective lens above the LED light source reflects light toward the inner wall of the bottom housing instead of scattering it directly outward. This reduces the efficiency loss (such as edge light leakage and center overexposure) caused by light directly penetrating the diffuser in traditional direct-down panel lights.

[0028] Through secondary reflection from the highly reflective curved bottom shell, a highly reflective coating (such as titanium dioxide) on the inner shell wall, and the curved side design, light is diffused multiple times within the shell, ensuring even distribution of light across the entire light-emitting surface. While traditional direct-lit designs are prone to uneven light spots or areas of excessive darkness due to the right-angled inner walls, the curved structure extends the optical path, allowing light to more fully cover the entire area and improve light utilization.

[0029] The reflective lens and the curved side wall work together. The cylinder in the reflective lens guides the main light beam to the curved side wall of the bottom shell. Combined with the arc curvature, the light forms a soft diffusion angle inside the shell, avoiding direct light from generating hot spots (local overbrightness) on the diffuser.

[0030] The secondary homogenization of the diffuser means that the light, after being evenly reflected by the bottom shell, has a more uniform incident angle when it passes through the diffuser again, further suppressing the common problem of "bright in the middle and dark at the edges" in traditional designs.

[0031] The structure is simplified and the cost is optimized, reducing the number and power of light strips. Traditional direct-down lamps require densely arranged light strips to compensate for the loss of light efficiency. However, this design uses high reflection paths and directional reflection to reduce the number of light strips or lower LED power at the same brightness, significantly saving costs and reducing volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of a direct-down panel light in the prior art;

[0033] Figure 2 This is a structural diagram of the direct-down panel light provided by the present invention;

[0034] Figure 3 A longitudinal cross-sectional structural diagram of the reflective lens, light bar, and LED light source provided by the present invention;

[0035] Figure 4 A cross-sectional structural diagram of the reflective lens provided by the present invention;

[0036] Figure 5 This is a main structural diagram of the reflective lens provided by the present invention;

[0037] Figure 6 A vertical structural diagram of the reflective lens provided by the present invention;

[0038] Figure 7 A cross-sectional structural diagram of a reflective lens with a substrate provided by the present invention, viewed from a first direction;

[0039] Figure 8 A cross-sectional structural diagram of a reflective lens with a substrate provided by the present invention, viewed from a second direction;

[0040] Figure 9 This is a schematic diagram of light distribution of the LED light source provided by the present invention after passing through the reflective lens and side wall.

[0041] In the figure: 1. Diffuser plate; 2. Bottom plate; 3. Side wall; 4. Light bar; 5. Refractive lens; 6. Reflective lens; 7. Light; 8. LED light source; 9. Highly reflective bottom shell; 10. Recessed area; 61. Pointed ear-shaped protrusion; 62. Arc seat; 63. Inner side surface; 64. Second arc surface; 65. Substrate; 66. Hole. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] See Figures 2 to 6The present invention provides a reflective lens and a direct-down panel light. The direct-down panel light includes a highly reflective bottom shell 9. A diffusion plate 1 is installed at the opening of the highly reflective bottom shell 9. A plurality of light strips 4 are installed in the highly reflective bottom shell 9. The light strips 4 include a circuit board. An LED light source 8 is arrayed on the circuit board. A reflective lens 6 is installed on the LED light source 8. The two side surfaces of the highly reflective bottom shell 9 are curved.

[0044] Among them, Figure 3 and Figure 4 As shown, the longitudinal cross-section of the reflective lens 6 is an M-shaped double-peak structure as a whole, and pointed ear-shaped protrusions extending obliquely upward are symmetrically distributed on both sides of the top of the reflective lens 6, and the bottom of the reflective lens 6 is concave upward to form a concave area for accommodating the LED light source 8.

[0045] The LED light source 8 is attached to the light strip 4, and a reflective lens 6 is attached to each LED light source 8. The light emitted by the LED light source 8 passes through the reflective lens 6 and is reflected onto the highly reflective bottom shell 9. The highly reflective bottom shell is made into an arc shape, which is more conducive to light emission. After diffuse reflection by the highly reflective bottom shell 9, the light is reflected onto the diffuser plate 1 to achieve light emission.

[0046] In one embodiment, the pointed ear-shaped protrusion extends obliquely upward to form a directional reflective surface. This design can guide the light from the LED light source 8 to the middle area of the bottom shell, avoiding uneven light spots caused by scattering of light at the edges.

[0047] The width of the recessed area at the bottom is slightly larger than the package size of the LED light source 8, ensuring that more than 90% of the light emitted by the light source is captured and reflected directionally by the lens. The lens material is high-refractive index PMMA (refractive index 1.49), and the surface is microstructured using a nanoimprinting process to further improve reflection efficiency.

[0048] like Figure 5 and Figure 6 As shown, the overall structure of the reflective lens 6 includes an arc seat 62 with a convex periphery and a cylinder 61. The bottom of the arc seat 62 is concave upward to form a concave area 10 for accommodating the LED light source 8. The top of the concave area 10 is provided with a downward convex arc surface 64 that smoothly transitions from the center to the periphery.

[0049] The cylinder 61 and the arc seat 62 are integrally formed and located on the top of the arc seat 62. A groove is provided in the cylinder 61, which is concave downward from the top. The longitudinal cross-section of the groove is V-shaped, and the inner side surface of the groove is an outward convex arc surface. The arc curvature radius of the bottom shell of the cylinder 61 is 260 mm.

[0050] The top point of the cylinder 61 is defined as A, the lowest point of the groove is defined as B, a virtual connecting line segment is formed between A and B, and the angle between the virtual connecting line segment and the horizontal plane is defined as a, then 29<a<32 degrees, and the angle a is preferably 31 degrees.

[0051] The height of the cylinder 61 is defined as d1, the height of the reflective lens 6 is defined as d2, and the height of the reflective lens 6 is defined as d3, where d2≦2d1 and d3<d4.

[0052] In one embodiment, d1 = 4.1 mm, d2 = 8.1 mm, d3 = 13.5 mm, and d4 = 16 mm.

[0053] like Figure 7 and Figure 8 As shown, further, a substrate 65 may be provided to adapt to different installation scenarios, and a hole 66 corresponding to the recessed area 10 is provided in the middle of the substrate 65 .

[0054] Through this design, the lens can effectively focus and guide the light emitted by the LED, improving the utilization rate of the light and the illumination effect.

[0055] Light from the LED light source 8 is reflected by the lens's pointed ear-shaped projections onto the bottom housing's inner wall (bottom plate 2) or side wall 3. From there, it is reflected back onto the diffuser plate 1, where it passes through the PMMA diffuser plate 1 and exits. This design increases light utilization efficiency to 85%, a 22% improvement over traditional direct-lit backlight modules.

[0056] In terms of light spot uniformity: Integrating sphere testing shows that the brightness uniformity of this solution on the 600×600mm light-emitting surface reaches 85% (CIE standard), which is 7 percentage points higher than the existing technology using refractive lenses (78%).

[0057] like Figure 2 As shown, in terms of structural simplification: through optimizing the optical design, the number of light strips is reduced from the conventional 4-6 (light strip spacing 92-160mm) to 2, the spacing between the two light strips is between 280MM±15MM, and the curvature of the side wall 3 is a circular arc structure of φ265MM±15MM. The light emitted from the LED light source 8 is reflected by the reflective lens 6 and irradiated onto the arc of the side wall 3. By adjusting the size of the arc structure of the side, each light reflected by the arc surface and reaching the diffuser plate can be controlled, so that the light reaching the diffuser plate is evenly distributed, thereby achieving the purpose of uniform light spot. Figure 9 As shown by light 7 on the left.

[0058] The nine-square grid test uniformity method, the test data uniformity comparison is as follows:

[0059] Table 1 shows the test data of the panel light with 4 light strips

[0060]

[0061] Table 2 shows the test data of the panel light with only two light strips using the reflective test lens in the present invention.

[0062]

[0063] Energy efficiency improvement: under the same brightness conditions, the power consumption is reduced by 20% compared with traditional solutions.

[0064] The present invention adopts a reflective lens and realizes diffuse reflection and emission of light through a highly reflective bottom shell, so that the uniformity of the emitted light spot is significantly improved.

[0065] Compared with the refraction panel light, the present invention reduces the usage of light strips, connecting wires and glue for fixing the light board, and simplifies the process of attaching the light strips, thereby reducing labor costs.

[0066] The present invention improves the uniformity of light spots by 7%, reduces power consumption by 20%, and shortens assembly time by 50% through the synergistic effect of the reflective lens and the curved bottom shell.

[0067] Table 3 is the test data of large truck with 4 light bars

[0068] Table 4 is the test data of arc bottom of 2 light bars

[0069]

[0070] The reflective lens and direct-down panel light provided by the present invention have the following advantages:

[0071] The present invention provides a reflective lens and a direct-down panel light, which achieve significant beneficial effects by optimizing the optical design. First, by adopting a reflective lens with an M-shaped double-peak structure in the longitudinal section, combined with a cylinder extending obliquely upward (whose longitudinal section is a pointed ear-shaped protrusion), the light emitted by the LED light source can be effectively focused and guided, avoiding uneven light spots caused by edge light scattering, thereby improving the utilization rate of light and the illumination effect, and improving the uniformity of the light spot by 7%, reaching 85%. Secondly, combined with an arc-shaped high-reflective bottom shell, the diffuse reflection effect of light is further enhanced, making the output light more uniform and soft. In addition, the present invention reduces the number of light strips from the conventional 4-6 to 2 through optimized design, thereby simplifying the structure and reducing material and labor costs. In terms of energy efficiency, it is measured that under the same brightness conditions, the power consumption is reduced by 20% compared with the traditional solution, achieving energy-saving effects. Overall, the present invention not only improves the utilization rate and uniformity of light and reduces energy consumption, but also simplifies the structure and assembly process, reducing production costs.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reflective lens, characterized in that: include: An arc seat (62) with a convex periphery, the bottom of the arc seat (62) is concave upward to form a concave area (10) for accommodating an LED light source (8), and the top of the concave area (10) is provided with a downward convex arc surface (64) that smoothly transitions from the center to the periphery; The cylinder (61) is integrally formed with the arc seat (62) and is located at the top of the arc seat (62). A groove is provided in the cylinder (61) and is recessed downward from the top. The longitudinal cross-section of the groove is V-shaped, and the inner side surface of the groove is an outward convex arc surface.

2. The reflective lens according to claim 1, wherein: The top point of the cylinder (61) is defined as A, the lowest point of the groove is defined as B, a virtual connecting line segment is formed between A and B, and the angle between the virtual connecting line segment and the horizontal plane is defined as a, then 29<a<32 degrees.

3. The reflective lens according to claim 2, wherein: The height of the cylinder (61) is d1, the height of the reflective lens (6) is d2, the height of the reflective lens (6) is d3, d2≦2d1, d3<d4.

4. The reflective lens according to claim 3, wherein: d1=4.1mm, d2=8.1mm, d3=13.5mm, d4=16mm.

5. A direct-down panel light, characterized in that: The invention comprises a highly reflective bottom shell (9), a diffusion plate (1) is installed at the opening of the highly reflective bottom shell (9), a plurality of light strips (4) are installed in the highly reflective bottom shell (9), the light strips (4) comprise circuit boards, LED light sources (8) are arrayed on the circuit boards, and the reflective lens (6) as claimed in claim 1 is installed on the LED light sources (8), and both side surfaces of the highly reflective bottom shell (9) are arc-shaped.

6. The direct-down panel light according to claim 5, characterized in that: The highly reflective bottom shell (9) is provided with a through hole for the power line to pass through.

7. The direct-down panel light according to claim 6, characterized in that: The highly reflective bottom shell (9) comprises a bottom plate (2) and side walls (3) connected around the bottom plate (2); the side walls (3) surround the edge of the bottom plate (2) to form a trumpet-shaped opening; the light bar (4) is mounted on the bottom plate (2); and the bottom plate (2) and the side walls (3) are integrally formed.

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