A light-blocking film

Abstract

This utility model relates to a fully light-shielding film, comprising a main film and a light-shielding ink layer disposed on any surface of the main film along its thickness direction. A micro-etched pit structure is provided on the side of the main film facing the light-shielding ink layer, and the light-shielding ink layer covers the micro-etched pit structure. At least a portion of the light-shielding ink layer is embedded in the micro-etched pit structure. The light-shielding ink layer has three layers, wherein the thickness of any one layer is greater than that of the other two layers. The advantages are: by setting a micro-etched pit structure on the main film and partially embedding the light-shielding ink layer therein, the adhesion between the light-shielding ink layer and the main film is significantly improved, effectively resisting shrinkage stress. Simultaneously, the multi-layer light-shielding ink layer design fundamentally avoids network cracks caused by curing, ensuring the integrity and continuity of the physical structure of the light-shielding layer.

Description

Technical Field

[0001] This utility model belongs to the field of thin films, and in particular relates to a fully light-blocking thin film. Background Technology

[0002] In the existing technology, when the light-shielding film is dried and cured after the light-shielding layer is attached, the evaporation of moisture causes the resin to shrink, which leads to the shrinkage and cracking of the light-shielding layer of the light-shielding film. This directly destroys the physical continuity of the light-shielding layer and fails to meet the technical requirements of full light-shielding. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems by providing a fully light-blocking film that can solve the technical issues described above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A light-shielding film includes a main film and a light-shielding ink layer disposed on any surface of the main film in the thickness direction. A micro-etched pit structure is provided on the side of the main film facing the light-shielding ink layer. The light-shielding ink layer covers the micro-etched pit structure. At least a portion of the light-shielding ink layer is embedded in the micro-etched pit structure. The light-shielding ink layer has three layers, wherein the thickness of any one of the light-shielding ink layers is greater than that of the other two light-shielding ink layers.

[0005] Furthermore, the thickness of the main film is 2 μm.

[0006] Furthermore, the total thickness of the main film and the plurality of light-shielding ink layers is less than or equal to 8 μm.

[0007] Furthermore, the light-shielding ink layer comprises at least two ink layers that are completely overlapping.

[0008] Furthermore, the thickest ink layer in the light-shielding ink layer is located on the side closest to the main film.

[0009] Furthermore, the main film is made of PET material.

[0010] Furthermore, the depth of the micro-cratch structure is between 0.1 μm and 1 μm.

[0011] Furthermore, the light-shielding film also includes a protective coating on the surface of the outermost light-shielding ink layer.

[0012] Compared with existing technologies, the advantages of this application are as follows: by setting micro-etching pit structures on the main film and embedding the light-shielding ink layer therein, the adhesion between the light-shielding ink layer and the main film is significantly improved, effectively resisting shrinkage stress. At the same time, the multi-layer light-shielding ink layer design fundamentally avoids the network cracks caused by curing, ensuring the integrity and continuity of the physical structure of the light-shielding layer. Attached Figure Description

[0013] Figure 1 This is an exploded schematic front view of the main component of the all-light-shielding film of this utility model; Figure 2 This is an exploded front view of the main component of the light-blocking film of this utility model.

[0014] In the figure, 1 is the main film, 2 is the light-shielding ink layer, 3 is the micro-etching pit structure, and 4 is the protective coating. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0016] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0018] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0019] Example 1

[0020] like Figure 1 As shown, a light-blocking film includes a main film 1 and a light-blocking ink layer 2 disposed on any surface of the main film 1 in the thickness direction.

[0021] Specifically, a micro-etching pit structure 3 is provided on the side of the main film 1 facing the light-shielding ink layer 2. The micro-etching pit structure 3 is fabricated using a corona discharge process and consists of densely arranged tiny pits. Its function is: 1. Significantly increases the contact surface area between the main film 1 and the light-shielding ink layer 2; enhances the adhesion between the light-shielding ink layer 2 and the main film 1, and effectively prevents the ink layer from peeling or falling off during use.

[0022] Second, the micro-etching pit structure 3 disrupts the originally possible smooth optical interface between the main film 1 and the light-shielding ink layer 2, reducing the specular reflection light at the interface. This part of the reflected light may also become a potential source of leakage light.

[0023] The light-shielding ink layer 2 covers the micro-etched pit structure 3, and at least a portion of the light-shielding ink layer 2 is embedded in the micro-etched pit structure 3.

[0024] Specifically, the aforementioned light-shielding ink layer 2 has three layers, and the number of layers can be increased according to actual operating conditions. Any one of the light-shielding ink layers 2 is thicker than the other two, with the thicker layer undertaking the core light-shielding function. Its greater thickness ensures a sufficiently high concentration of light-absorbing pigments, maximizing the absorption of light from the main film 1 and the upper ink layer. This is a key guarantee for achieving extremely low light transmittance.

[0025] Specifically, the light-shielding ink layer 2 includes at least two completely overlapping ink layers, with the thickest ink layer in the light-shielding ink layer 2 located on the side closest to the main film 1.

[0026] In this embodiment, as Figure 2 As shown, the main film 1 has a thickness of 2 μm, while the depth of the micro-pit structure 3 is between 0.1 μm and 1 μm. In actual production, the formation of the micro-pit structure depends on precisely controlled corona treatment parameters, including voltage, electrode spacing, and processing speed. These parameters directly affect the density and depth of the pits, thereby affecting the adhesion enhancement effect and reflection suppression performance. Meanwhile, the light-shielding ink is usually applied layer by layer using printing or precision coating processes. The drying or curing process of each layer requires strict control of temperature and time to avoid interlayer mixing or internal stress, which would affect the overall structural stability and light-shielding uniformity.

[0027] In addition, the total thickness of the main film 1 and several light-shielding ink layers 2 is less than or equal to 8μm. The design allows the entire light-shielding film to maintain excellent overall thinness and flexibility while possessing excellent light-shielding performance, making it very suitable for precision optical systems or microelectronic devices with strict space and weight restrictions.

[0028] In this embodiment, the main film 1 is made of PET material, while the light-shielding ink layer 2 uses a high-concentration epoxy-modified ink system with light-absorbing pigments. PET is chosen as the substrate mainly because of its excellent mechanical strength, dimensional stability, and good chemical resistance, providing a reliable carrier for subsequent corona treatment and ink coating processes.

[0029] The light-shielding ink layer 2 is applied and cured in three stages using a printing process. The formulation of each layer can be fine-tuned; for example, the content of the resin binder can be appropriately increased to enhance penetration and adhesion. The thickened layer maximizes the filling concentration of the light-absorbing pigment, ensuring sufficient absorption of incident light. The top layer balances surface abrasion resistance and further light capture. This "three-layer composite" structural design achieves an optimal balance between optical performance and mechanical reliability through functional layering, within the constraint of ultra-thin overall physical thickness.

[0030] The full-light-shielding film also includes a protective coating 4 on the surface of the outermost light-shielding ink layer 2. This protective layer is usually made of cured resin material, and its core function is to act as a physical barrier to effectively resist scratches, abrasions and chemical solvent erosion that may occur in the use environment, and to prevent the light-shielding ink layer 2 below from falling off or thinning due to physical damage, thereby maintaining the integrity of its core light-shielding performance in the long term.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A full-sunlight-blocking film comprising a main film (1), and a sunlight-blocking ink layer (2) provided on either surface of the main film (1) in the thickness direction, characterized in that, A micro-etched pit structure (3) is provided on the side of the main film (1) facing the light-shielding ink layer (2), the light-shielding ink layer (2) covers the micro-etched pit structure (3), at least a portion of the light-shielding ink layer (2) is embedded in the micro-etched pit structure (3), the light-shielding ink layer (2) has three layers, wherein the thickness of any one layer of the light-shielding ink layer (2) is greater than that of the other two layers of the light-shielding ink layer (2).

2. A full shade film according to claim 1, wherein The thickness of the main membrane (1) is 2 μm.

3. The film of claim 1, wherein The total thickness of the main film (1) and the plurality of light-shielding ink layers (2) is less than or equal to 8 μm.

4. The full shade film according to claim 1, wherein The light-shielding ink layer (2) comprises at least two ink layers that are completely overlapping.

5. The film of claim 1, wherein The thickest ink layer in the light-shielding ink layer (2) is located on the side closest to the main film (1).

6. A full shade film according to claim 1, wherein The main film (1) is made of PET material.

7. The film of claim 1, wherein, The depth of the micro-cratch structure (3) is between 0.1 μm and 1 μm.

8. The film of claim 1, wherein, The light-shielding film also includes a protective coating (4) on the surface of the outermost light-shielding ink layer (2).

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