Anti-dazzling screen

Abstract

The utility model discloses an anti-dazzling screen, and belongs to the technical field of optics. The anti-dazzling screen provided by the utility model comprises a black PET (Polyethylene Terephthalate) film layer and a texture layer, wherein the texture layer is of a three-dimensional structure formed by transferring black glue to one surface of the black PET film through a nanoimprint technology. The black PET film layer has low reflectivity and low transmittance, and the texture layer comprising the three-dimensional structure further reduces the reflectivity and transmittance of light. The anti-dazzling screen has the advantages of being low in cost and high in applicability, the anti-dazzling screen is attached to the inner wall of a lens assembly area of imaging equipment, the phenomena of disordered refraction, reflection and the like of stray light in a lens can be reduced, and the image output quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a light shielding sheet. Background Art

[0002] To reduce the impact of stray light on imaging, existing technologies typically employ methods such as silk-screening or pad printing black ink on internal lenses and using black internal components to absorb internal and external stray light. This reduces interference from stray light within the imaging device and improves image clarity. However, the existing methods of absorbing stray light using black ink or paint have certain limitations. Their absorption capacity is limited, and a significant portion of stray light continues to undergo disordered refraction and reflection within the imaging device, causing the photosensitive element to receive interfering light, resulting in unclear or even blurred images. Utility Model Content

[0003] The utility model aims at solving the above problems in the prior art and provides a light shielding sheet.

[0004] The utility model provides a light-shielding sheet, which is used to be attached to the inner wall of the lens assembly area to reduce the influence of stray light on the imaging effect of the lens; the light-shielding sheet includes a black PET film layer and a texture layer; the black PET film layer and the texture layer are both used to reduce the reflectivity and transmittance of light; the texture layer is a three-dimensional structure formed by transferring black glue to one surface of the black PET film through nanoimprint technology; the texture layer is composed of a plurality of convex mold structures arranged and combined; the convex mold structures include cones, square pyramids, and rectangular parallelepipeds; the arrangement and combination methods include alignment, staggered, and random.

[0005] The present invention has the following beneficial effects: The light-shielding sheet provided by the present invention comprises a black PET film layer and a textured layer. The textured layer is a three-dimensional structure formed by transferring black glue onto one surface of the black PET film using nanoimprinting technology. The black PET film layer has low reflectivity and low transmittance, and the textured layer comprising the three-dimensional structure further reduces the reflectivity and transmittance of light. The light-shielding sheet of this solution has the advantages of low cost and wide applicability. When attached to the inner wall of the lens assembly area of ​​an imaging device, it can reduce the disordered refraction and reflection of stray light within the lens, thereby improving the quality of image output. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a structural schematic diagram of the light-shielding sheet provided in an embodiment of the utility model.

[0007] Figure 2 Schematic diagram of the texture layer cone punch structure provided in an embodiment of the utility model.

[0008] Figure 3Schematic diagram of the square pyramidal punch structure of the texture layer provided in an embodiment of the present utility model.

[0009] Figure 4 Schematic diagram of the texture layer cube punch structure provided in an embodiment of the present utility model.

[0010] Figure 5 A side view schematic diagram of the alignment arrangement of the texture layer rectangular parallelepiped punch structure provided in an embodiment of the present utility model.

[0011] Figure 6 A schematic top view of the alignment arrangement of the rectangular convex mold structure of the texture layer provided in an embodiment of the present invention.

[0012] Figure 7 A side view schematic diagram of the staggered arrangement of the texture layer rectangular parallelepiped punch structure provided in an embodiment of the present utility model.

[0013] Figure 8 A top view schematic diagram of the staggered arrangement of the texture layer rectangular parallelepiped punch structure provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0015] The light-shielding sheet provided by the solution of the utility model is suitable for being pasted on the inner wall of the lens assembly area of ​​imaging devices such as the lens module of a mobile phone, the optical imaging module of a smart car, a digital camera, a visual robot, and a projector, and is used to reduce the disordered refraction and reflection of stray light inside the imaging device.

[0016] like Figure 1 As shown, an embodiment of the present invention provides a light-shielding sheet, which is used to be attached to the inner wall of the lens assembly area to reduce the influence of stray light on the imaging effect of the lens; the light-shielding sheet includes a black PET film layer 1 and a texture layer 2; the black PET film layer 1 and the texture layer 2 are both used to reduce the reflectivity and transmittance of light; the texture layer 2 is a three-dimensional structure formed by transferring black glue to one surface of the black PET film through nanoimprint technology; the texture layer 2 is composed of a plurality of convex mold structures 3 arranged and combined; the convex mold structure 3 includes a cone, a square pyramid, and a cuboid; the arrangement and combination methods include alignment, staggered, and random.

[0017] PET (Polyethylene Terephthalate) is a common thermoplastic used in a wide range of applications. The main components of PET are terephthalic acid and ethylene glycol. Terephthalic acid, an aromatic diacid, is a key monomer in PET, providing its rigidity and heat resistance. Ethylene glycol, a diol, reacts with terephthalic acid to form polymer chains, giving PET its excellent transparency and toughness. Terephthalic acid and ethylene glycol combine through a condensation reaction to form long-chain PET. PET has high mechanical strength and hardness, excellent mechanical properties, and is resistant to oils, fats, weak acids, weak bases, and most solvents. It also has high transparency, good gloss, lightweight, and is recyclable.

[0018] In some embodiments of the present invention, the black PET film layer 1 is made of a mixture of carbon black and PET raw materials, and the carbon black is evenly distributed in the black PET film layer 1, so that the black PET film has uniform and stable reflectivity and transmittance. Carbon black, as a black pigment, can improve the coloring ability of the PET substrate, turning the PET film from a transparent material into a black material. Black has advantages such as low reflectivity and low transmittance. Therefore, by adding carbon black to ordinary PET film, a black PET film with low reflectivity and low transmittance can be obtained, which is suitable for use as a light-shielding film inside imaging equipment. Carbon black can also improve the wear resistance, anti-static properties, heat deformation resistance, dimensional stability, rigidity and hardness of the PET film. In addition, carbon black can absorb ultraviolet rays, which helps protect the PET material from photodegradation and improve its weather resistance. Carbon black can also improve the thermal conductivity of the PET material, making it more advantageous in certain applications.

[0019] In an embodiment of the present invention, the weight ratio of the carbon black to the PET raw material is 0.5 to 5:100, and the particle size of the carbon black is less than 100 nm. In some embodiments of the present invention, the particle size of the carbon black particles ranges from a few nanometers to tens of nanometers, preferably, the particle size ranges from about 5 nanometers to about 50 nanometers. Common structures of carbon black include spherical and chain-like. The process of adding carbon black to PET includes the following steps: first, pre-treating the surface of the carbon black to ensure that the carbon black and the PET particles can be fully fused; then, adding the pre-treated carbon black to the PET particles in a molten state, and stirring them thoroughly so that the carbon black can be evenly distributed in the PET; finally, cooling and molding to obtain a PET composite material with evenly distributed carbon black.

[0020] In other embodiments of the present invention, black dye is used to make black PET film. Its production process is similar to that of making black PET film using carbon black, and it is also necessary to ensure that the black dye can be evenly distributed in the PET film.

[0021] In the embodiment of the present invention, the texture layer 2 is formed by transferring black glue to the surface of the black PET film 1 by nanoimprint technology. The specific steps of forming the texture layer on the black PET film by nanoimprint technology are as follows:

[0022] 1. Mould preparation: Using computer numerical control technology, the designed texture is precisely engraved on the metal mould.

[0023] 2. Mold placement: Place the engraved metal mold on the loading platform of the nanoimprinting equipment to ensure accurate positioning of the mold.

[0024] 3. Coating operation: The metal mold is transferred to the coating operation station along with the loading platform. The glue coating system is started and the coating nozzle evenly coats the black glue on the surface of the metal mold to ensure uniform glue distribution.

[0025] 4. Pressing and holding pressure: The robot presses the black PET film flatly onto the metal mold coated with glue and applies pressure for a certain period of time so that the glue naturally solidifies on the black PET film during the process, ensuring that the film is tightly bonded to the mold surface.

[0026] 5. Separation and curing: The robot arm is lifted to separate the black PET film from the metal mold to obtain a black PET film with a cured texture layer.

[0027] 6. Shape cutting: According to the required shape dimensions, use die cutting or laser cutting technology to accurately cut the cured black PET film to ensure that the finished product size meets the requirements.

[0028] In the embodiment of the present invention, the texture layer 2 is composed of a plurality of convex mold structures arranged and combined, and the convex mold structure 3 includes a cone, a square cone, and a cuboid, and the arrangement and combination methods include alignment, staggered, and random. Figure 2-Figure 4 As shown, Figure 2-Figure 4 They are cross-sectional views of the cone, square pyramid and cube convex mold structures 3 along the vertical direction, a represents the bottom diameter, b represents the height of the convex mold structure, and c represents the top diameter. In the embodiment of the present invention, the bottom diameter of the convex mold structure 3 is 20-50um, and the top of the cone and square pyramid convex mold structures 3 is a pointed structure with a diameter less than 2um; the height of the convex mold structure 3 is 15-40um. The interval between adjacent convex mold structures is 0-3um, and the thickness of the black PET film layer is 25-100um. The same texture layer 2 may include only one convex mold structure 3 or multiple convex mold structures 3. Multiple convex mold structures 3 are arranged and combined on the surface of the black PET film layer 1 to form a texture layer 2. As shown Figure 5The figure shows a schematic side view of the alignment of the rectangular convex structure 3, where d1 represents the thickness of the black PET film layer 1 and d2 represents the height of the texture layer 2. Figure 6 The diagram shows a top view of the arrangement of the rectangular parallelepiped convex structure 3, where l2 represents the length of the texture and w2 represents the width of the texture. Figure 7 The figure shows a side view of the staggered arrangement of the rectangular convex structure 3, where d1 represents the thickness of the black PET film layer 1 and d2 represents the height of the texture layer 2. Figure 8 The figure shows a top view of the staggered arrangement of rectangular convex structures 3. l2 represents the length of the texture, and w2 represents the width of the texture. The greater the height and density of the convex structures 3, the lower the reflectivity and transmittance of the texture layer.

[0029] Testing has shown that transparent PET has a reflectivity greater than 60% and a transmittance greater than 90%. The reflectivity of PET with carbon black added is less than 20% and the transmittance is less than 0.01%. The reflectivity of PET with carbon black and a textured layer added is less than 0.5% and the transmittance is less than 0.0001%. This shows that the light-shielding sheet produced by the present invention has ultra-low reflectivity and transmittance. It can be cut according to the internal dimensions of the imaging device and attached to the protective cover of the mobile phone lens, internal lenses: aspherical lenses, low-dispersion lenses, prisms, and the inner wall of the camera lens assembly area, with the textured side facing the light. This absorbs the disordered refraction and reflection of stray light inside the lens, transforming the original "disordered reception" of the photosensitive element into "ordered reception." This also reduces the difficulty of the software in calculating stray light, improves the software's operating efficiency, and thus improves the quality of the image output.

[0030] The use of carbon black to produce black PET film and nanoimprinting technology are both existing technologies with low raw material costs. Therefore, the light shielding sheet of the utility model has the advantage of low cost. The light shielding sheet of the utility model does not need to be customized for the lens assembly. When used, it can be cut according to actual needs and attached to the lens assembly or the inner wall of the lens assembly area, which has the advantage of wide applicability.

[0031] The present invention has the following beneficial effects: The light-shielding sheet provided by the present invention includes a black PET film layer and a textured layer. The textured layer is a three-dimensional structure formed by transferring black glue to one surface of the black PET film using nanoimprinting technology. The black PET film layer has low reflectivity and low transmittance, and the textured layer containing the three-dimensional structure further reduces the reflectivity and transmittance of light. The light-shielding sheet of this solution has the advantages of low cost and strong applicability. When attached to the inner wall of the lens assembly area of ​​an imaging device, it can reduce the disordered refraction and reflection of stray light within the lens, thereby improving image output quality, ensuring image clarity, and enhancing the viewing experience.

[0032] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of deformation without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. A light shielding sheet, characterized in that: The light shielding sheet is used to be attached to the inner wall of the lens assembly area to reduce the influence of stray light on the imaging effect of the lens; the light shielding sheet comprises a black PET film layer (1) and a texture layer (2); the black PET film layer (1) and the texture layer (2) are both used to reduce the reflectivity and transmittance of light; the texture layer (2) is a three-dimensional structure formed by transferring black glue to one surface of the black PET film through nano-imprinting technology; the texture layer (2) is formed by arranging and combining a plurality of convex mold structures (3); the convex mold structures (3) include cones, square pyramids, and cuboids; the arrangement and combination methods include alignment, dislocation, and randomness.

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