A unique light-incident point structure for a light guide plate of a sign light

Abstract

This utility model proposes an irregularly shaped light-incident point structure for a light guide plate of a fire emergency evacuation sign, comprising: a main body of the light guide plate, including an irregularly shaped light-incident surface, a light-emitting surface, and a bottom surface; the irregularly shaped light-incident surface includes a first concave arc-shaped surface and a second concave arc-shaped surface connected to the first concave arc-shaped surface; the curvature of the first concave arc-shaped surface is greater than the curvature of the second concave arc-shaped surface; the first concave arc-shaped surface corresponds to the irregularly shaped area where the light of the fire emergency evacuation sign is prone to being too bright and / or the area close to the light source LED; the second concave arc-shaped surface corresponds to the irregularly shaped area where the light of the fire emergency evacuation sign is prone to being insufficient and / or the area far from the light source LED. The beneficial effects of this utility model are: through the innovative design of the light-incident point, it effectively improves the light distribution in the irregularly shaped area of ​​the light guide plate, increases light uniformity, and reduces light energy loss, thereby significantly improving the lighting effect and reliability of the fire emergency evacuation sign, ensuring clear and effective guidance for personnel evacuation in emergency situations, and highly adaptable to the miniaturization of fire emergency evacuation sign lights.

Description

Technical Field

[0001] This utility model relates to the field of fire emergency equipment technology, and in particular to an irregularly shaped light-incident point structure for a light guide plate of a sign light. Background Technology

[0002] Fire emergency evacuation signs play a crucial role in guiding people to safety during emergencies such as fires, and their lighting effect directly affects the efficiency and safety of evacuation. Currently, light guide plates are widely used in fire emergency evacuation signs to achieve uniform light distribution and guidance. However, with the diversification of building spaces and the increasing demand for miniaturized and high-performance signs, the existing light guide plate light point design has revealed many problems.

[0003] In common fire emergency evacuation signs, the light guide plate's light entry point often employs a conventional, uniform distribution or a simple structural design. When applied to miniaturized signs, due to space constraints, this conventional design makes it difficult to precisely control the light for irregularly shaped areas, such as the tips of arrows or specific parts of figures. For example, in some signs with complex evacuation guidance patterns, uneven light distribution may occur in certain irregularly shaped areas, resulting in insufficient brightness in some areas and affecting the clarity and effectiveness of the evacuation guidance.

[0004] Furthermore, traditional light guide plate light entry point solutions cannot fully optimize the light propagation path when faced with the compact layout inside the sign light. During light propagation within the light guide plate, unreasonable light entry angles and paths can easily lead to significant light energy loss, reducing the overall luminous efficiency of the sign light. This not only affects the visibility of the sign light in emergency situations but may also increase the burden on battery and other power supply equipment.

[0005] While some existing technologies attempt to improve backlight uniformity by adjusting parameters such as dot density and depth of the light guide plate, these methods are not ideal for the irregularly shaped areas of small fire emergency evacuation signs. This is because the irregular shapes and small sizes of these areas make it difficult for conventional parameter adjustments to meet the specific requirements for precise light control. Therefore, there is an urgent need for a solution specifically designed for irregularly shaped light entry points on the light guide plate of fire emergency evacuation signs to address these technical challenges and improve the reliability of the signs. Utility Model Content

[0006] This utility model proposes an irregular light-incident point structure for the light guide plate of a sign light. Through innovative design of the light-incident point, it effectively improves the light distribution in the irregular area of ​​the light guide plate, enhances light uniformity, and reduces light energy loss, thereby significantly improving the lighting effect and reliability of the fire emergency evacuation sign light and ensuring clear and effective guidance for personnel evacuation in emergency situations.

[0007] The technical solution of this utility model is implemented as follows:

[0008] A uniquely shaped light incident point structure for a light guide plate of a sign light includes:

[0009] The light guide plate body includes an irregularly shaped light-incident surface, a light-exit surface, and a bottom surface. The irregularly shaped light-incident surface includes a first concave arc-shaped surface and a second concave arc-shaped surface connected to the first concave arc-shaped surface. The curvature of the first concave arc-shaped surface is greater than the curvature of the second concave arc-shaped surface. The first concave arc-shaped surface corresponds to the irregularly shaped area where the light of the sign light is prone to being too bright and / or the area close to the light source LED. The second concave arc-shaped surface corresponds to the irregularly shaped area where the light of the sign light is prone to being insufficient and / or the area far from the light source LED.

[0010] Furthermore, the irregular light-incident surface also includes a horizontal light-incident surface, which is connected to one end of the first concave arcuate surface and / or the second concave arcuate surface.

[0011] Furthermore, the irregular light-incident point structure of the light guide plate of the sign light described in this utility model also includes a dot surface and irregular dots with raised structures set on the dot surface. The shape of the irregular dots projected onto the dot surface is a polygon, and the density of the irregular dots gradually increases in the direction away from the irregular light-incident surface.

[0012] Furthermore, the irregular dot pattern includes a first surface, a second surface, a third surface, and a fourth surface. The first surface is located on the side of the irregular dot pattern closer to the irregular light-incident surface. The second surface is located on the side of the irregular dot pattern away from the light-incident surface of the light guide plate. The third and fourth surfaces are located on both sides of the first surface. The four sides of the first surface are the edges where the first surface intersects with the dot surface, the second surface, the third surface, and the fourth surface, respectively. The second, third, and fourth surfaces all intersect with the dot surface. The second surface also intersects with the third and fourth surfaces. The angle between the first and second surfaces is 120° to 150°. The angle between the third and fourth surfaces and the dot surface is less than 90°. The reflective surfaces formed by the first and second surfaces are convergent reflective surfaces, which converge the light rays towards the light-emitting surface of the light guide plate.

[0013] Furthermore, the irregular light incident point structure of the light guide plate of the sign light described in this utility model also includes a reflective layer disposed on the bottom surface. The reflective layer is a metal reflective film or a reflective optical material reflective film.

[0014] Preferably, the reflective layer is an aluminum reflective film or a silver reflective film.

[0015] Furthermore, the irregular light-incident point structure of the light guide plate of the sign light described in this utility model also includes a diffusion layer disposed on the light-emitting surface.

[0016] Preferably, the diffusion layer is a diffusion film, a diffusion plate, or an optical coating with diffusion function.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. Significantly improves light uniformity: By designing an irregular light-incident structure on the light-incident surface and cooperating with the design of irregular dot patterns, the direction of light propagation can be precisely adjusted according to the light requirements of the irregular areas of the fire emergency evacuation sign light's light guide plate. This effectively solves the problem of uneven light distribution in irregular areas, improves the overall light uniformity of the light guide plate, and ensures that all parts of the evacuation indicator pattern can be clearly and brightly displayed, greatly enhancing the guiding effect of the sign light in emergency situations.

[0019] 2. Significantly Reduced Light Energy Loss: The concave arc-shaped light-receiving point and the clustered reflection design of the irregularly shaped dots shorten the light propagation path, reducing scattering and loss during propagation. In situations where fire emergency evacuation signs typically rely on battery power, this design improves light energy utilization, reduces energy consumption, and extends the sign's runtime. It ensures that even in emergencies such as prolonged power outages, the signs can continue to operate stably, providing reliable lighting guidance for evacuation.

[0020] 3. Highly adaptable to miniaturization of sign lights: The solution of this utility model is specifically designed for the space constraints and irregular shape characteristics of small fire emergency evacuation sign lights. The structure is compact and flexible, which can well adapt to the complex spatial layout and special shape requirements of the sign light. Without increasing the size of the light body, it significantly improves the lighting performance, providing strong technical support for the miniaturization and high-performance development of fire emergency evacuation sign lights, and has broad application prospects. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of an irregularly shaped light incident point structure for a light guide plate of a sign light according to this utility model;

[0023] Figure 2 This is a schematic diagram of the irregular light-incident surface of an irregular light-incident point structure for a light guide plate of a sign light according to this utility model;

[0024] Figure 3 for Figure 2 A magnified view of part A in the image;

[0025] Figure 4This is a schematic diagram of the irregularly shaped dot structure of the irregularly shaped light incident point structure of the light guide plate of the sign light according to this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of a sign light with an irregularly shaped light incident point structure for a light guide plate, which is based on the present invention.

[0027] Figure 6 This is a structural schematic diagram of an irregularly shaped light incident point structure for a light guide plate of a sign light according to this utility model;

[0028] Figure 7 This utility model illustrates the assembly of the circuit board and the main body of the light guide plate of a sign light using the irregular light incident point structure of the light guide plate of a sign light.

[0029] Figure 8 This is a schematic diagram of the irregular dot density distribution of an irregular light incident point structure for a marker light light guide plate according to this utility model;

[0030] Figure 9 This is a schematic diagram of the patterned area of ​​a sign light using the irregular light incident point structure of a light guide plate of this utility model.

[0031] Figure 10 This is a coloring diagram for emergency brightness testing of the surface pattern area of ​​a sign light with an irregularly shaped incident light point structure that utilizes the light guide plate of this utility model. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figure 1-3 As shown, the present invention provides a uniquely shaped light incident point structure for a light guide plate of a sign light, comprising:

[0034] The light guide plate body 1 includes an irregularly shaped light-incident surface 101, a light-emitting surface 102, and a bottom surface 103. The irregularly shaped light-incident surface 101 includes a first concave arc-shaped surface 1011 and a second concave arc-shaped surface 1012 connected to the first concave arc-shaped surface 1011. The curvature of the first concave arc-shaped surface 1011 is greater than the curvature of the second concave arc-shaped surface 1012. The first concave arc-shaped surface 1011 corresponds to the irregularly shaped area where the light of the sign light is prone to being too bright and / or the area close to the light source LED. The second concave arc-shaped surface 1012 corresponds to the irregularly shaped area where the light of the sign light is prone to being insufficient and / or the area far from the light source LED.

[0035] Specifically, the light guide plate body 1 is a high light transmittance light guide plate body, such as an acrylic light guide plate body or a polycarbonate light guide plate body, which has good optical and mechanical properties. The shape of the light guide plate body 1 can be designed into various shapes such as rectangle, circle, and irregular shape according to actual application requirements.

[0036] The irregular light-incident surface 101 also includes a horizontal light-incident surface 1013, which is connected to one end of the first concave arc-shaped surface 1011 and / or the second concave arc-shaped surface 1012.

[0037] For irregularly shaped areas in fire emergency evacuation signs where the light is prone to being too bright, such as the main body of a large indicator arrow or areas close to the light source, a large-curvature arc surface structure is set on the corresponding light-incident side. This structure increases the angle at which light enters the light guide plate, causing the light to be more biased towards the front part of the light in the irregularly shaped area. Combined with a low-density LED distribution, this reduces the overall brightness of the area and improves the uniformity of light. Conversely, for irregularly shaped areas where the light is prone to being insufficient, such as the tip of an arrow or areas far from the light source, a small-curvature light-incident arc surface is set. This structure reduces the angle at which light enters the light guide plate, causing the light to be biased towards the rear of the irregularly shaped area. Combined with a high-density LED distribution, this increases the brightness of the area, ensuring uniform light distribution in the central area and achieving the best optical effect.

[0038] The irregular light-incident point structure of the light guide plate of the sign light described in this utility model also includes a dot surface 104 and irregular dots 2 with raised structures on the dot surface 104. The irregular dots 2 projected onto the dot surface 104 are polygonal, and the density of the irregular dots 2 gradually increases in the direction away from the irregular light-incident surface 101.

[0039] Among them, such as Figure 4As shown, the irregular dot 2 includes a first surface 201, a second surface 202, a third surface 203, and a fourth surface 204. The first surface 201 is located on the side of the irregular dot 2 closest to the irregular light-incident surface 101. The second surface 202 is located on the side of the irregular dot 2 away from the irregular light-incident surface 101 of the light guide plate body 1. The third surface 203 and the fourth surface 204 are located on opposite sides of the first surface 201. The four sides of the first surface 201 are respectively the first surface 201 and the dot surface 104, the second surface 202, the third surface 203, and the fourth surface 204. The four intersecting edges—the second surface 202, the third surface 203, and the fourth surface 204—all intersect with the dot surface 104. The second surface 202 also intersects with the third surface 203 and the fourth surface 204. The angle between the first surface 201 and the second surface 202 is 120°–150°. The angle between the third surface 203, the fourth surface 204, and the dot surface 104 is less than 90°. The reflective surface formed by the first surface 201 and the second surface 202 is a converging reflection of light, drawing the light towards the light-emitting surface 102 of the light guide plate body 1. The angle between the first surface 201 and the dot surface 104 is smaller than the angle between the second surface 202 and the dot surface 104.

[0040] Irregularly shaped dots 2 are set on the dot surface 104 of the light guide plate body 1. The shape of the irregularly shaped dots 2 projected onto the dot surface 104 is polygonal to adapt to the complex light distribution requirements of fire emergency evacuation sign lights. The irregularly shaped dots 2 converge the light towards the light-emitting surface 102 of the light guide plate body 1, shortening the light propagation path, reducing light energy loss, and thus improving the front brightness of the light guide plate body 1, ensuring that the evacuation indication pattern is clear and bright. The density of the irregularly shaped dots 2 on the dot surface 104 gradually increases towards the direction away from the irregularly shaped light-incident surface 101, specifically as follows: Figure 8 As shown. In fire emergency evacuation sign lights, the farther the light energy travels, the greater the energy attenuation. By increasing the density of the irregularly shaped dots 2 that are far away from the irregularly shaped light-incident surface 101, the amount of light refraction can be increased to compensate for the energy attenuation, making the overall brightness of the light guide plate body 1 uniform and ensuring that the brightness of the entire evacuation indicator pattern is consistent in different positions, avoiding local situations that are too dark or too bright.

[0041] The angle between the first surface 201 and the second surface 202 is 150°, the angle b between the first surface 201 and the dot surface 104 is 10°, and the angle c between the second surface 202 and the dot surface 104 is 20°. The first surface 201 has a short side 2011 and a long side 2012. The short side 2011 is the side of the first surface 201 closest to the incident light surface 101, and its length is 12µm. The long side 2012 is the intersection line of the first surface 201 and the second surface 202, and its length is 16µm. The distance L from the long side 2012 to the dot surface 104 is 3µm. The first surface 201 is an isosceles trapezoidal plane, and the second surface 202 is a rectangular plane.

[0042] The intersection line of the first surface 201 and the second surface 202 is arranged parallel to the dot surface 104, and the distance from the intersection line to the dot surface 104 is 2.8um to 3.5um. The irregularly shaped dots 2 are formed and transferred onto the light guide plate by a mold. The distance from the intersection line to the dot surface 104 is 2.8um to 3.5um, which facilitates the processing and transfer of the irregularly shaped dots 2. If the distance exceeds 3.5um, it is difficult to form and transfer the irregularly shaped dots 2.

[0043] Light enters from the light-incident surface 101 and arrives at the first surface 201 and the second surface 202. The reflective surfaces formed by the first surface 201 and the second surface 202 are convergent reflectors, which converge the light towards the light-emitting surface 102 of the light-guiding plate body 1, reducing divergence, shortening the propagation path of the light, and reducing the loss of light energy.

[0044] The irregular halftone dot 2 projected onto the halftone dot surface 104 can be an octagon. The third surface 203 and the fourth surface 204 are symmetrically arranged about the axis of the first surface 201. Both the third surface 203 and the fourth surface 204 include a first inclined surface 205, a second inclined surface 206, and a third inclined surface 207, all of which are triangular planes. The first inclined surface 205 intersects with the halftone dot surface 104, the first surface 201, and the second inclined surface 206. The second inclined surface 206 is located between the first inclined surface 205 and the third inclined surface 207. The second inclined surface 206 also intersects with the halftone dot surface 104 and the third inclined surface 207. The third inclined surface 207 also intersects with the halftone dot surface 104 and the second surface 202.

[0045] The first inclined surface 205 includes a first side AB, a second side BC, and a first included angle ∠ABC. End A of the first side AB is connected to one end of the long side 2012, and end B of the first side AB is connected to one end of the short side 2011. The length of the first side AB is 27 μm, the length of the second side BC is 26 μm, and the angle of the first included angle ∠ABC is 26°. The third inclined surface 207 includes a third side AE, a fourth side ED, and a second included angle ∠AED. The length of the third side AE ​​is 13 μm, the length of the fourth side ED is 12 μm, and the angle of the first included angle ∠AED is 48°.

[0046] The third surface 203 and the fourth surface 204 can split the light to both sides and reflect the light towards the light-emitting surface 102 of the light-emitting plate body 1, ensuring that the uniformity of the brightness of the light-emitting surface 102 meets the application requirements. The symmetrical arrangement of the third surface 203 and the fourth surface 204 is beneficial for processing and injection molding, while also ensuring that the amount of light splitting on both sides is the same.

[0047] The irregular light incident point structure of the light guide plate of the sign light described in this utility model also includes a reflective layer, which is disposed on the bottom surface 103. The reflective layer is a metal reflective film or a reflective optical material reflective film.

[0048] Preferably, the reflective layer is an aluminum reflective film or a silver reflective film.

[0049] The irregular light-incident point structure of the light guide plate of the sign light described in this utility model has a reflective layer that reflects light back into the main body 1 of the light guide plate, thereby reducing light loss and improving light utilization.

[0050] The irregular light-incident point structure of the light guide plate of the sign light described in this utility model also includes a diffusion layer disposed on the light-emitting surface 102.

[0051] Preferably, the diffusion layer is a diffusion film, a diffusion plate, or an optical coating with diffusion function.

[0052] The irregular light-incident point structure of the light guide plate of the sign light described in this utility model has a diffusion layer that diffuses the light propagating inside the main body 1 of the light guide plate, so that the light is emitted more evenly from the light-emitting surface and the uniformity of light emission is improved.

[0053] like Figure 5-7 As shown, this utility model also provides a light guide plate body 1 as described above.

[0054] The sign light using the irregular light incident point structure of the light guide plate of the present invention further includes a diffuser plate 3 and a front panel 4 arranged sequentially on one side of the light guide plate body 1, a reflective film 5 and a back plate 6 arranged on the other side of the light guide plate body 1, a circuit board 7 matching the light guide plate body 1, and a power line 8 connected to the circuit board 7. The circuit board 7 is provided with an irregularly shaped protrusion 701 matching the irregularly shaped light incident surface 101, and a light source lamp bead 702 is provided on the irregularly shaped protrusion 701.

[0055] The irregularly shaped light incident point structure of the light guide plate of the sign light described in this utility model, is used to... Figure 9 Taking the patterned area shown as an example, an emergency brightness test was conducted on the surface patterned area, and the results were as follows: Figure 10 The surface pattern area shown is a color map for emergency brightness testing, and the relevant test values ​​are shown in Table 1.

[0056] Table 1 Emergency Brightness Test Values ​​of Each Marker Point in the Pattern Area of ​​the Marker Light Surface

[0057] 1 171.35 213.67 10 159.37 200.22 2 149.24 169.28 11 92.06 109.95 3 181.71 214.34 12 75.17 98.23 4 94.94 117.55 13 158.27 213.69 5 113.64 134.66 14 113.98 140.64 6 103.04 122.01 15 114.19 141.24 7 163.21 204.73 16 86.25 104.53 8 132.66 186.22 Maximum value 181.71 249.68 9 132.65 249.68 Minimum value 75.17 98.23

[0058] The above test values ​​meet the requirements of GB 17945-2024, which states that "when the light source of the sign lamp is in emergency lighting mode, the minimum brightness of its sign surface should not be less than 50 cd / m2, and the maximum brightness should not be greater than 300 cd / m2".

[0059] The irregularly shaped light-incident point structure of the light guide plate of this utility model allows light to enter the main body 1 of the light guide plate through the irregularly shaped light-incident surface 101. Due to the irregular shape of the light-incident point, the light propagates within the main body 1 of the light guide plate at a specific angle and direction. During propagation, the light is reflected back into the main body 1 of the light guide plate when it encounters the reflective layer on the bottom surface 103 of the main body 1 of the light guide plate, and continues to propagate. When the light propagates to the light-emitting surface 102 of the main body 1 of the light guide plate, it is diffused by the diffusion layer, and the light is emitted uniformly from the light-emitting surface 102, forming a uniform surface light source. By precisely designing the shape, size, and distribution of the irregularly shaped light-incident surface 101, the propagation path and angle of the light can be effectively controlled, improving light utilization and light emission uniformity.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A light guide plate irregular light entry point structure for a marker light, characterized by comprising: include: The main body (1) of the light guide plate includes an irregular light-incident surface (101), a light-outceasing surface (102), and a bottom surface (103). The irregular light-incident surface (101) includes a first concave arc surface (1011) and a second concave arc surface (1012) connected to the first concave arc surface (1011). The curvature of the first concave arc surface (1011) is greater than the curvature of the second concave arc surface (1012). The first concave arc surface (1011) corresponds to the irregular area where the light of the sign light is prone to being too bright and / or the area close to the light source lamp beads. The second concave arc surface (1012) corresponds to the irregular area where the light of the sign light is prone to being insufficient and / or the area far from the light source lamp beads.

2. The marker light light guide plate special light entry point structure according to claim 1, characterized in that, The irregular light-incident surface (101) also includes a horizontal light-incident surface (1013), which is connected to one end of the first concave arcuate surface (1011) and / or the second concave arcuate surface (1012).

3. The marker light light guide plate special light entry point structure according to claim 1, characterized in that, It also includes a dot surface (104) and irregular dots (2) with raised structures set on the dot surface (104). The irregular dots (2) projected onto the dot surface (104) are polygons. The density of the irregular dots (2) gradually increases in the direction away from the irregular light-incident surface (101).

4. The marker light light guide plate special light entry point structure according to claim 3, characterized in that, The irregular dot (2) includes a first surface (201), a second surface (202), a third surface (203), and a fourth surface (204). The first surface (201) is located on the side of the irregular dot (2) close to the irregular light-incident surface (101). The second surface (202) is located on the side of the irregular dot (2) away from the irregular light-incident surface (101) of the light guide plate body (1). The third surface (203) and the fourth surface (204) are located on both sides of the first surface (201). The four sides of the first surface (201) are respectively the first surface (201) and the dot surface (104), the second surface (202), the third surface (203), and the fourth surface (204). The edges of the intersection of the second surface (202), the third surface (203), and the fourth surface (204) all intersect with the dot surface (104). The second surface (202) also intersects with the third surface (203) and the fourth surface (204). The angle between the first surface (201) and the second surface (202) is 120° to 150°. The angle between the third surface (203), the fourth surface (204) and the dot surface (104) is less than 90°. The reflective surface formed by the first surface (201) and the second surface (202) is a convergent reflection of the light, which gathers the light towards the light-emitting surface (102) of the light guide plate body (1).

5. The irregular light incident point structure of the light guide plate of the sign light according to claim 1, characterized in that, It also includes a reflective layer, which is disposed on the bottom surface (103). The reflective layer is a metal reflective film or a reflective optical material reflective film.

6. The irregular light incident point structure of the light guide plate for the sign light according to claim 5, characterized in that, The reflective layer is an aluminum reflective film or a silver reflective film.

7. The irregular light incident point structure of the light guide plate for the sign light according to claim 1, characterized in that, It also includes a diffusion layer disposed on the light-emitting surface (102).

8. The irregular light incident point structure of the light guide plate for the sign light according to claim 7, characterized in that, The diffusion layer is a diffusion film, diffusion plate, or optical coating with diffusion function.

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