Flexible light guide diaphragm and car roof interior trim

Abstract

The utility model discloses a flexible light guide diaphragm and a car roof interior trim, and belongs to the technical field of car interior trim illumination. The flexible light guide diaphragm comprises a base layer, a micro-nano light guide layer, a reflective film layer and a bonding layer. The micro-nano light guide layer realizes uniform distribution and efficient light guide of light rays by optimizing the arrangement of a micro-nano structure. The reflective film layer is designed in black and white colors, so that the light reflectivity is effectively improved, and the shading performance is enhanced. The light guide diaphragm has high flexibility and reelability, is adaptive to a complex curved surface of a car roof, and does not influence normal use of a skylight function. Through the technical design of the utility model, the uniformity, the energy-saving property and the individuation of the illumination in the vehicle are improved, the diversified application requirements are met, and the technical innovation and the practical value are remarkable.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile interior lighting, and in particular relates to a flexible light-guiding diaphragm and a roof interior. Background Art

[0002] Existing automotive interior lighting solutions primarily rely on light-guiding films on rigid substrates. Due to the rigidity of these materials, these films are typically fixed to the roof or other locations within the vehicle, significantly limiting their design and application scope. Key issues include:

[0003] Lack of adaptability: Rigid light-guiding films lack flexibility and are difficult to adjust to the complex curved surfaces of the roof, especially on irregularly shaped areas, where they cannot achieve a tight fit. This not only affects the overall aesthetics but also limits the application of light-guiding films in areas with high curvature.

[0004] Functional conflicts: Current light-guiding films are incompatible with active components like the sunroof. Due to their fixed installation, the light-guiding films cannot synchronize with the sunroof when it opens or closes. This makes it difficult for the interior lighting system to function in conjunction with the sunroof.

[0005] Poor light uniformity: The design limitations of existing light-guiding film lighting systems result in uneven light distribution, which is prone to localized bright spots or dark areas. This not only affects the overall interior atmosphere but also may reduce the visual comfort of passengers.

[0006] Low light efficiency and high energy consumption:

[0007] Due to the limitations of material transmittance and light-guiding efficiency, traditional light-guiding films require an increased number of light sources to achieve sufficient brightness. This increase in light sources not only increases system complexity and cost, but also increases overall energy consumption, which is inconsistent with energy-saving requirements.

[0008] Safety hazards: Due to design limitations, hard light-guiding films may cause light to directly illuminate the driver's field of vision, resulting in a dazzling effect, especially when driving at night, which can easily interfere with driving safety.

[0009] Limited personalized design: With the increasing demand for personalized interior ambient lighting, traditional light-guiding films cannot meet the display requirements of complex dynamic patterns due to their single pattern design, limiting the interior's potential in combining beauty and functionality.

[0010] In summary, existing technologies struggle to provide a solution that can adapt to the complex curves of a vehicle roof, accommodate sunroof functionality, and achieve efficient and uniform lighting. Therefore, there is an urgent need for a flexible light-guiding film that not only provides high-quality lighting without compromising sunroof functionality but also meets the personalized design requirements for interior ambient lighting. Utility Model Content

[0011] The purpose of this utility model is to provide a flexible light-guiding film and roof interior that can be flexibly rolled and unrolled in vehicles with sunroofs, improving interior lighting while maintaining the normal functionality of the sunroof. This flexible light-guiding film overcomes the limitations of existing rigid light-guiding films. Through innovative micro-nanostructures and material processing, it ensures uniform light output and high light efficiency without compromising driver safety.

[0012] The technical solution of the utility model is:

[0013] A flexible light-guiding film, characterized by comprising:

[0014] grassroots;

[0015] A micro-nano light-guiding layer is provided on the base layer and comprises a non-light-guiding area and a plurality of light-guiding areas comprising micro-nano structures, wherein the density of the micro-nano structures gradually changes according to the distance from the light source;

[0016] A reflective film layer is provided on the micro-nano light guiding layer;

[0017] The adhesive layer is provided between the micro-nano light-guiding layer and the reflective film layer.

[0018] Preferably, the flexible light-guiding film further comprises a barrier layer, and the barrier layer is configured to be disposed on a side of the micro-nano light-guiding layer away from the base layer.

[0019] Optionally, the barrier layer is a coating formed of titanium dioxide or silver paste, and the thickness of the coating is 20% to 50% of the depth of the micro-nano structure.

[0020] Optionally, the barrier layer is a coating layer formed by a vacuum PVD (Physical Vapor Deposition) process and having a refractive index greater than 2.0, and a thickness of 10 nm-100 nm.

[0021] Preferably, the closer the micro-nano structures are to the light source, the sparser their arrangement; and the farther the micro-nano structures are from the light source, the denser their arrangement.

[0022] Preferably, the angle between the micro-nano structure and the direction perpendicular to the light is in the range of -5° to 5°, the period of the micro-nano structure is 10 μm-200 μm, and the depth of the micro-nano structure in the micro-nano light guiding layer is 1 μm-50 μm.

[0023] Optionally, the micro-nano structure includes: rectangular grooves, elliptical grooves, triangular grooves, trapezoidal grooves, and diamond grooves.

[0024] Preferably, the reflective film layer is a black and white two-color film layer, one side is white and the other side is black, and the adhesive layer is provided between the micro-nano light-guiding layer and the white side of the black and white two-color film layer.

[0025] Preferably, the adhesive layer frame is arranged around the micro-nano light-guiding layer or the reflective film layer.

[0026] Preferably, the adhesive layer is a transparent honeycomb hot melt adhesive layer, which is arranged on the reflective film layer and adhered to the barrier layer.

[0027] The utility model also provides a roof interior decoration, comprising:

[0028] Perforated leather, including perforated areas for light transmission and non-perforated areas for light blocking;

[0029] A flexible light-guiding film, the structure of which is as described above;

[0030] The adhesive layer is used to glue the perforated leather to the base layer of the flexible light-guiding film.

[0031] The utility model has the following beneficial effects:

[0032] Improved Lighting Uniformity and Flexibility: This new design, through the design of a flexible light-guiding film, overcomes the limitations of existing rigid light-guiding films, which are unable to adapt to curved roof surfaces and skylight functions. It provides a flexible lighting solution that can be rolled and unfolded, suitable for various roof interior layouts. Furthermore, the optimized arrangement of micro-nano structures ensures uniform light output, making the roof lighting softer and enhancing the overall interior atmosphere.

[0033] High luminous efficiency and significant energy savings: By utilizing high-refractive index materials and precisely designed micro-nanostructures, this innovative light-guiding film effectively reduces light loss and improves overall luminous efficiency. This highly efficient lighting approach not only reduces the number of light sources used but also lowers energy consumption, meeting energy conservation and environmental protection requirements.

[0034] Enhanced safety: The utility model ensures that the light output angle does not affect the driver's line of sight through a reasonable light guiding design, avoids the glare effect that may be caused by traditional lighting systems, and greatly improves driving safety.

[0035] Combining personalization and functionality: Flexible light-guiding film not only provides lighting but can also be customized with various patterns through 3D lithography technology to meet the owner's personalized needs for the interior atmosphere. Without affecting the function of the roof sunroof, the light-guiding film can be rolled up or unfolded at any time, providing an innovative design that combines functionality and aesthetics for the interior. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1This is a structural diagram of the flexible light-guiding film in Example 1 of the present utility model.

[0037] Figure 2 It is a schematic diagram of the arrangement of the non-light-guiding area and the light-guiding area in the micro-nano light-guiding layer of Example 1 of the present utility model.

[0038] Figure 3 Schematic diagram of the angle between the micro-nano structure and the vertical direction of the light in the light-guiding area of ​​Example 1 of the present utility model.

[0039] Figure 4 It is a micro-nano structure with different groove types in Example 1 of the utility model, including: (a) rectangular groove, (b) elliptical groove, (c) triangular groove, (d) trapezoidal groove, and (e) diamond groove.

[0040] Figure 5 This is a light guiding principle diagram of the flexible light guiding film in Example 1 of the utility model.

[0041] Figure 6 This is a structural diagram of the flexible light-guiding film in Example 2 of the present utility model.

[0042] Figure 7 This is a schematic diagram of the flexible light-guiding film of the utility model being applied to the flexible light-guiding structure of the roof interior. DETAILED DESCRIPTION

[0043] The structure and working principle of the present invention are further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following embodiments are merely illustrative of the specific implementation of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent or similar variations and substitutions based on the concept of the present invention shall fall within the scope of protection of the present invention.

[0044] Example 1

[0045] like Figure 1 As shown, the flexible light-guiding film of the present invention comprises:

[0046] Base layer 100; the base layer 100 material can be a flexible, high refractive index, transparent film with high light transmittance to ensure good optical properties, and at the same time it can be bent and has better flexibility; the base layer 100 can be PC with a light transmittance greater than 90%, but is not limited to this.

[0047] The micro-nano light guide layer 200 is provided on the base layer 100; Figure 2 As shown, it includes a non-light-guiding area 220 and multiple light-guiding areas 210, and micro-nano structures 201 are provided in the light-guiding areas. The density of the micro-nano structures 201 gradually changes according to the distance from the light source; the closer the micro-nano structures 201 are to the light source, the sparser the arrangement; the farther the micro-nano structures 201 are from the light source, the denser the arrangement; as shown in FIG. Figure 3 As shown, the angle between the micro-nano structure and the direction perpendicular to the light is α, and the range of angle α is -5° to 5°. The surface of the micro-nano structure is slightly tilted, forming a small angle with the light, which can make part of the light reflected or refracted at a controlled angle inside the diaphragm, avoiding the light from being emitted directly vertically, effectively dispersing the light, and thus achieving a more uniform light distribution on the surface of the light-guiding diaphragm. At the same time, the micro-nano structure 201 is sparsely arranged in the area close to the light source and densely arranged in the area far away from the light source, so that the light output of the entire light-guiding diaphragm is more uniform, ensuring the consistency of the light output at the front, middle and back ends, and avoiding the existence of dark areas. The period of the micro-nano structure is 10μm-200μm, and the depth of the micro-nano structure is 1μm-50μm; as shown Figure 4 As shown, the micro-nano structures include: rectangular grooves, elliptical grooves, triangular grooves, trapezoidal grooves, and diamond grooves;

[0048] The reflective film layer 400 is disposed on the micro-nano light-guiding layer. This reflective film layer 400 is a black and white bi-color film layer, with one side being white and the other black. An adhesive layer is disposed between the micro-nano light-guiding layer and the white side of the bi-color film layer. The bi-color film layer can be based on a white high-density PET or PC substrate with a thickness of 0.025mm to 0.5mm. The white side of the bi-color film layer is glossy with a reflectivity of no less than 88%, providing excellent reflective properties. The other side of the substrate is coated with a black nano-scale coating, forming a matte or glossy black surface with a thickness greater than 0.003mm, providing excellent light-shielding properties. In other embodiments, the reflective film layer 400 can be made of other materials, as long as one side has excellent reflective properties and faces the micro-nano light-guiding layer.

[0049] The adhesive layer 300 is disposed between the micro-nano light-guiding layer 200 and the reflective film layer 400. The side of the white substrate of the reflective film layer not coated with the black coating, i.e., the white side, is bonded to the micro-nano light-guiding layer 200 via the adhesive layer 300. In this case, the adhesive layer 300 is framed around the micro-nano light-guiding layer 200, or framed around the reflective film layer 400. The adhesive layer 300 can be made of OCA adhesive. Because the adhesive layer 300 is framed, a gap exists between the reflective film layer 400 and the micro-nano structure layer 200. At the same time, the micro-nano structures in the micro-nano structure layer 200 are not filled with adhesive, preserving the morphology and functionality of the micro-nano structures.

[0050] Figure 5 The figure shows the light guiding principle diagram of the flexible light guiding film of this embodiment, and the direction of the arrow in the figure is the direction of the light.

[0051] Example 2

[0052] like Figure 6As shown, the configuration of this embodiment is basically the same as that of embodiment 1, except that:

[0053] The flexible light-guiding film is also provided with a barrier layer 500, which is contoured and arranged on the side of the micro-nano light-guiding layer away from the base layer; the barrier layer is a coating formed by titanium dioxide or silver paste, and its coating thickness is 20% to 50% of the depth of the micro-nano structure groove; the barrier layer can also be a coating layer with a refractive index greater than 2.0 formed by a vacuum PVD process, with a thickness of 10nm-100nm.

[0054] The adhesive layer 300 is a transparent honeycomb hot melt adhesive layer, which is disposed on the reflective film layer 400 and adhered to the barrier layer 500 .

[0055] In this embodiment, a barrier layer is added, and the barrier layer is configured to imitate the micro-nano structure. At the same time, the barrier layer and the micro-nano structure layer have different refractive indices, so that a transparent honeycomb hot melt adhesive can be coated on the entire surface of the reflective film layer to form an adhesive layer. Since the barrier layer is added between the adhesive layer and the micro-nano structure layer, and the barrier layer and the micro-nano structure layer have the same morphology but different refractive indices, the micro-nano structure in the micro-nano structure layer can still reflect and refract light to transmit light.

[0056] Example 3

[0057] like Figure 7 As shown, the roof interior of the utility model also includes:

[0058] Perforated leather 1000, including a perforated area 1001 for light transmission and a non-perforated area 1002 for light blocking;

[0059] The flexible light-guiding film 2000 has the structure as described in Example 1 or 2;

[0060] The adhesive layer 3000 is used to glue the perforated leather to the base layer of the flexible light-guiding film. The adhesive layer is an OCA layer with a light transmittance of more than 95%.

[0061] Decorative effect and lighting realization:

[0062] In this new roof interior, the perforated areas correspond to the light-guiding areas of the micro-nano light-guiding layer, allowing light to pass through and form a specific decorative pattern. The light transmission pattern is uniform and soft, making it suitable for nighttime use. The light source brightness is adjustable to meet diverse lighting needs, while the flexible membrane material can conform to the curved surface of the roof, adapting to the installation requirements of different vehicle models.

[0063] The flexible light-guiding film of the utility model can meet various in-vehicle lighting and decoration needs. While ensuring efficient lighting, uniform distribution and energy-saving effects, it enhances structural stability and adaptability, fully reflecting the superiority and diversified applicability of this technical solution.

Claims

1. A flexible light-guiding film, characterized in that: include: grassroots; A micro-nano light-guiding layer is provided on the base layer and comprises a non-light-guiding area and a plurality of light-guiding areas comprising micro-nano structures, wherein the density of the micro-nano structures gradually changes according to the distance from the light source; A reflective film layer, provided on the micro-nano light guiding layer; The adhesive layer is provided between the micro-nano light-guiding layer and the reflective film layer.

2. The flexible light-guiding film according to claim 1, wherein: The flexible light-guiding film further comprises a barrier layer, and the barrier layer is configured to be arranged on a side of the micro-nano light-guiding layer away from the base layer.

3. The flexible light-guiding film according to claim 2, wherein: The barrier layer is a coating formed by titanium dioxide or silver paste, and its coating thickness is 20% to 50% of the depth of the micro-nano structure; alternatively, the barrier layer is a coating layer with a refractive index greater than 2.0 formed by a vacuum PVD process, and the thickness is 10nm to 100nm.

4. The flexible light-guiding film according to claim 1, wherein: The arrangement density of the micro-nano structures is gradually adjusted according to the distance from the light source, so that the arrangement density is low in the area close to the light source and high in the area far from the light source.

5. The flexible light-guiding film according to claim 1, wherein: The angle between the micro-nano structure and the direction perpendicular to the light is in the range of -5° to 5°, the period of the micro-nano structure is 10 μm-200 μm, and the depth of the micro-nano structure in the micro-nano light-guiding layer is 1 μm-50 μm.

6. The flexible light-guiding film according to claim 1, wherein: The reflective film layer is a black and white two-color film layer, one side is white and the other side is black, and the adhesive layer is arranged between the micro-nano light-guiding layer and the white side of the black and white two-color film layer.

7. The flexible light-guiding film according to claim 1, wherein: The adhesive layer frame is arranged around the micro-nano light-guiding layer or the reflective film layer.

8. The flexible light-guiding film according to claim 2, wherein: The adhesive layer is a transparent honeycomb hot melt adhesive layer, which is arranged on the reflective film layer and adheres to the barrier layer.

9. A roof interior, characterized in that: include: Perforated leather, including perforated areas for light transmission and non-perforated areas for light blocking; A flexible light-guiding film, wherein the structure of the flexible light-guiding film is as described in any one of claims 1 to 8; The adhesive layer is used to glue the perforated leather to the base layer of the flexible light-guiding film.

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