Extinction anti-dazzling screen and lens with extinction anti-dazzling screen

Abstract

The utility model provides an extinction anti-dazzling screen and a lens with the extinction anti-dazzling screen, the extinction anti-dazzling screen comprises a base material, a first shading structure and a second shading structure, and the first shading structure and the second shading structure are arranged on the base material back to back. The base material is provided with a base material light through hole, the first shading structure is provided with a first shading structure light through hole, the second shading structure is provided with a second shading structure light through hole, and the base material light through hole, the first shading structure light through hole and the second shading structure light through hole are coaxial and form an inner hole of the extinction shading sheet; the extinction layer is formed on the surface of the first shading structure and / or the second shading structure and the surface of the inner hole.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to an extinction light-shielding sheet and a lens with an extinction light-shielding sheet. Background Art

[0002] The light-shielding sheet is one of the important components in the cameras of many electronic products. Its function is to block the excess stray light in the imaging lens. It can prevent light from entering the lens or sensor from unwanted directions, thereby improving the quality and clarity of the image. The reflectivity of its surface and the inner hole cross-section has a direct impact on the improvement of stray light.

[0003] The surface material of the light-shielding sheet in the prior art is usually a carbon layer or a graphene layer, and the intermediate substrate component is generally polyethylene terephthalate (PET), and its chemical formula is (C10H8O4)n. The structure described here is close to a three-layer stacked structure. The upper and lower surfaces are made of black carbon layer material, and the intermediate layer is made of polyethylene terephthalate (PET) material. The black carbon layer is beneficial to the absorption of stray light, and the intermediate substrate layer is beneficial to the light-shielding sheet not to deform and bend under the premise of high flatness and ultra-thinness, playing a supporting role. The raw material for processing the light-shielding sheet is in the shape of a sheet, and generally a stamping die is used to punch out the circular ring of the inner hole for use. The cross-section of the inner hole formed by stamping is generally smooth and shiny, and the surface reflectivity is extremely high. Therefore, this kind of light-shielding sheet in the prior art will reflect a lot of stray light with strong energy during the lens imaging process, and stray light spots will appear on the optical imaging surface, affecting the imaging quality.

[0004] In addition, due to the structural defects of the light-shielding sheet in the prior art, there are also problems in at least one of the following aspects. For example, it is difficult to remove the fine burrs around the light-transmitting hole of the light-shielding sheet in the prior art, and abnormal shapes and warping occur. Summary of the Utility Model

[0005] One main advantage of the utility model is to provide an extinction light-shielding sheet and a lens with an extinction light-shielding sheet, wherein the light-shielding sheet is provided with an extinction layer, and the extinction layer is formed on the surface of the light-shielding sheet and the cross-section of the light-transmitting hole, which is beneficial to reducing the reflectivity and improving the stray light.

[0006] Another advantage of the utility model is to provide an extinction light-shielding sheet and a lens with an extinction light-shielding sheet, wherein the extinction layer of the light-shielding sheet is formed on the surface and the cross-section of the light-transmitting hole through extinction treatment, which is beneficial to improving the fine burrs around the light-transmitting hole.

[0007] Another advantage of the present utility model lies in providing a light extinction shading sheet and a lens with a light extinction shading sheet, wherein the shading sheet includes a base material and a first shading structure and a second shading structure disposed on both sides of the base material, and a light extinction layer is formed through the light extinction treatment of the base material, the first shading structure, and the second shading structure, so that incident light forms diffuse reflection, thereby reducing the reflectivity on the surface of the shading structure.

[0008] Another advantage of the present utility model lies in providing a light extinction shading sheet and a lens with a light extinction shading sheet, wherein the light extinction layer of the shading sheet covers the outer surface of the shading structure, which is conducive to the small difference in the thickness of the shading sheet after the light extinction treatment compared with that before the treatment. When assembled into a finished lens, this change amount will not affect the performance of the lens itself.

[0009] Another advantage of the present utility model lies in providing a light extinction shading sheet and a lens with a light extinction shading sheet, wherein the light extinction layer of the shading sheet is conducive to improving the signs of hairiness, whiteness, and shininess on the surface, enhancing the physical visual texture of the shading structure, reducing the reflectivity of the surface and inner holes to eliminate stray light. Assembling the shading sheet into the lens is conducive to improving the imaging quality of the lens, and the reflectivity of the micro-indentation structure layer to light in the wavelength range of 420nm - 730nm is less than or equal to 2.5%.

[0010] Another advantage of the present utility model lies in providing a light extinction shading sheet and a lens with a light extinction shading sheet, wherein the shading sheet is not prone to warping during the assembly process, avoiding negative impacts such as light leakage caused by deformation.

[0011] Another advantage of the present utility model lies in providing a light extinction shading sheet and a lens with a light extinction shading sheet, wherein the materials of the first shading structure and the second shading structure of the shading sheet are carbon layers, which are not prone to deformation during the light extinction treatment, facilitating the guarantee of the shading effect of the light extinction shading sheet.

[0012] According to one aspect of the present utility model, a light extinction shading sheet of the present utility model capable of achieving the foregoing objects and other objects and advantages includes:

[0013] A base material;

[0014] A first shading structure and a second shading structure, wherein the first shading structure and the second shading structure are disposed back to back on both sides of the base material, the base material is provided with a base material light passing hole, the first shading structure is provided with a first shading structure light passing hole, and the second shading structure is provided with a second shading structure light passing hole, wherein the base material light passing hole, the first shading structure light passing hole, and the second shading structure light passing hole are coaxial and form the inner hole of the light extinction shading sheet; and

[0015] A light extinction layer, wherein the light extinction layer is formed on the surfaces of the first light shielding structure, the second light shielding structure, and the surface of the inner hole. The first light shielding structure is provided with a first light shielding surface, and the second light shielding structure is provided with a second light shielding surface. The inner hole penetrates from the first light shielding surface of the first light shielding structure to the second light shielding surface of the second light shielding structure. The first light shielding surface of the first light shielding structure and / or the second light shielding surface of the second light shielding structure and the surface of the inner hole are formed with the light extinction layer in a physical light extinction manner.

[0016] According to an embodiment of the present invention, the light extinction layer is a micro-indentation structure layer formed by physical light extinction treatment.

[0017] According to an embodiment of the present invention, the material of the substrate is polyethylene terephthalate, and the materials of the first light shielding structure and the second light shielding structure are carbon layers.

[0018] According to an embodiment of the present invention, let the outer diameter of the light extinction light shielding sheet be M, and the outer diameter M of the light extinction light shielding sheet satisfies the relational expression: 0.1 mm ≤ M ≤ 100 mm; the inner diameter of the inner hole is M1, which satisfies the relational expression: 0.1 mm < M1 < 100 mm, and satisfies the relational expression: 0.05 < (M - M1) / M1 < 1.

[0019] According to an embodiment of the present invention, let the thickness of the light extinction light shielding sheet be T, and the thickness T of the light extinction light shielding sheet satisfies 6 μm ≤ T ≤ 100 μm; the thickness t2 of the substrate satisfies the relational expression: 1 μm ≤ t2 ≤ 85 μm, and satisfies: 0.01 < t2 / T < 1.

[0020] According to an embodiment of the present invention, the thickness t1 of the first light shielding structure satisfies: 2 μm ≤ t1 ≤ 30 μm, the thickness of the second light shielding structure is t3, which satisfies the relational expression: 2 μm ≤ t3 ≤ 30 μm, and satisfies: 0 μm ≤ |t1 - t3| ≤ 1 μm.

[0021] According to an embodiment of the present invention, the light extinction layer of the light extinction light shielding sheet is formed on the entire surface of the light extinction light shielding sheet, and the thickness s of the light extinction layer satisfies 0.1 μm ≤ s ≤ 4 μm.

[0022] According to an embodiment of the present invention, the thickness s of the light extinction layer, the thickness t1 of the first light shielding structure, the thickness t2 of the substrate, and the thickness t3 of the second light shielding structure satisfy the relational expression: 0.01 < s / (t1 + t2 + t3) < 0.1.

[0023] According to an embodiment of the present utility model, let D1 be the minimum inner diameter of the light passing hole of the first light shielding structure of the first light shielding structure, D2 be the minimum inner diameter of the light passing hole of the base material of the base material, and D3 be the minimum inner diameter of the light passing hole of the second light shielding structure of the second light shielding structure, satisfying D2 ≤ D1 and / or D2 ≤ D3, and 0.5 ≤ D2 / (D1 + D3) ≤ 1.

[0024] According to an embodiment of the present utility model, let the maximum inner diameter of the light passing hole of the base material of the base material be D21, satisfying D21 ≤ D1 and / or D21 ≤ D3.

[0025] According to an embodiment of the present utility model, the light passing hole of the first light shielding structure, the light passing hole of the base material, and the light passing hole of the second light shielding structure of the inner hole forming the light extinction light shielding sheet are sequentially continuous.

[0026] On the other hand, according to the present application, the present application further provides a lens, including:

[0027] A lens barrel;

[0028] A plurality of lenses, wherein the plurality of lenses are arranged in the lens barrel; and

[0029] At least one light extinction light shielding sheet as described in any one of the above, wherein the light extinction light shielding sheet is arranged between two adjacent lenses.

[0030] According to an embodiment of the present utility model, the light extinction light shielding sheet abuts at least one of the lens or the lens barrel. On the object side of the light extinction light shielding sheet, the effective diameter of the image side of the adjacent lens is Z, wherein the inner diameter of the inner hole of the light extinction light shielding sheet is M1, and 0.85 < M1 / Z < 1 is satisfied.

[0031] According to an embodiment of the present utility model, let the entrance pupil diameter of the lens barrel be D5, and the entrance pupil diameter D5 of the lens barrel is less than or equal to the outer diameter M of the light extinction light shielding sheet to control the light input amount of the imaging system and reduce stray light.

[0032] Through the understanding of the subsequent description and the drawings, the further objects and advantages of the present utility model will be fully embodied.

[0033] These and other objects, features, and advantages of the present utility model are fully embodied through the following detailed description and the drawings. Description of the Drawings

[0034] Hereinafter, the technical solutions of the present utility model will be further described in detail with reference to the drawings and embodiments. In the drawings, unless otherwise specified, the same reference numerals are used to represent the same components. Among them:

[0035] Figure 1It is a cross-sectional view of a light extinction and light shielding sheet according to the first preferred embodiment of the present utility model.

[0036] Figure 2 It is a schematic diagram of the overall structure of the light extinction and light shielding sheet according to the above-mentioned first preferred embodiment of the present utility model.

[0037] Figure 3 It is a schematic diagram of the structural dimensions of the light extinction and light shielding sheet according to the above-mentioned first preferred embodiment of the present utility model.

[0038] Figures 4A to 4D It is a schematic diagram of several alternative embodiments of the light extinction and light shielding sheet according to the above-mentioned first preferred embodiment of the present utility model.

[0039] Figure 5 It is a schematic diagram of the comparison of the electron microscope appearance before and after the formation of the light extinction treatment layer on the surface of the light transmission hole of the light extinction and light shielding sheet, and the schematic diagram of the comparison of the electron microscope appearance before and after the light extinction treatment of the light extinction and light shielding sheet, according to the above-mentioned first preferred embodiment of the present utility model.

[0040] Figure 6 It is a schematic diagram of the surface roughness test of the inner ring of the light extinction and light shielding sheet according to the above-mentioned first preferred embodiment of the present utility model.

[0041] Figure 7 It is a schematic diagram for characterizing and distinguishing the light extinction and light shielding sheet from other treatment schemes according to the above-mentioned first preferred embodiment of the present utility model.

[0042] Figure 8 It is a schematic diagram of the structure of a lens with a light extinction and light shielding sheet according to another preferred embodiment of the present utility model. Detailed implementation manners

[0043] It should be noted that the embodiments shown in the drawings are only used as examples for specifically and vividly explaining and illustrating the concept of the present utility model. In terms of size and structure, they are neither necessarily drawn to scale nor constitute a limitation to the concept of the present utility model.

[0044] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0045] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. The term "a" should not be construed as a limitation on the number.

[0046] Referring to the accompanying drawings of the present application Figures 1 to 8 As shown, an extinction light-shielding sheet and a lens with an extinction light-shielding sheet according to a first preferred embodiment of the present application are illustrated in the following description. The extinction light-shielding sheet includes a substrate 10, a first light-shielding structure 20 and a second light-shielding structure 30 disposed on the substrate 10, wherein the first light-shielding structure 20 is disposed on one side of the substrate 10, and the second light-shielding structure 30 is disposed on the other side of the substrate 10, that is, the first light-shielding structure 20 and the second light-shielding structure 30 are disposed back to back on the side surface of the substrate 10.

[0047] The substrate 10 is provided with a substrate light-passing hole 101, the first light-shielding structure 20 is provided with a first light-shielding structure light-passing hole 201, and the second light-shielding structure 30 is provided with a second light-shielding structure light-passing hole 301. Among them, the substrate light-passing hole 101, the first light-shielding structure light-passing hole 201 and the second light-shielding structure light-passing hole 301 are coaxial, which helps to reduce abnormal phenomena such as burrs and irregular shapes in the light-passing holes. The substrate light-passing hole 101, the first light-shielding structure light-passing hole 201 and the second light-shielding structure light-passing hole 301 form an inner hole 40 of the extinction light-shielding sheet, and the inner hole 40 penetrates through the substrate 10, the first light-shielding structure 20 and the second light-shielding structure 30.

[0048] The extinction light-shielding sheet is further provided with at least one extinction layer 50, wherein the extinction layer 50 is formed on the surface of the first light-shielding structure 20 and / or the second light-shielding structure 30 and the surface of the inner hole 40, and is used to improve the signs of hairiness, whiteness and shininess on the surface, enhance the visual texture of the light-shielding structure in kind, and reduce the reflectivity of the surface and the inner hole to eliminate stray light.

[0049] The extinction layer 50 is a micro-depression structure layer formed by physical extinction treatment on the surface of the first light-shielding structure 20 and / or the second light-shielding structure 30 and the surface of the inner hole 40, and the reflectivity of the micro-depression structure layer to light in the wavelength range of 420nm - 730nm is less than or equal to 2.5%.

[0050] The first light-shielding structure 20 is provided with a first light-shielding surface 202, and the second light-shielding structure 30 is provided with a second light-shielding surface 302. Among them, the first light-shielding surface 202 of the first light-shielding structure 20 and the second light-shielding surface 302 of the second light-shielding structure 30 are formed back to back on both sides of the extinction light-shielding sheet. The inner hole 40 penetrates from the first light-shielding surface 202 of the first light-shielding structure 20 to the second light-shielding surface 302 of the second light-shielding structure 30.

[0051] In this preferred embodiment of the present application, the first light-shielding surface 202 of the first light-shielding structure 20 and / or the second light-shielding surface 302 of the second light-shielding structure 30 and the surface of the inner hole 40 are formed with the light-shielding layer in a physical light extinction manner.

[0052] It is worth mentioning that in the present application, the concept of the light extinction treatment includes but is not limited to grinding auxiliary materials such as grinding particles, polyacrylic acid, and polymerization inhibitor in a dedicated high-frequency grinding machine to perform light extinction treatment on the light-shielding sheet according to a specific process. After the treatment, the cross-sections of the first light-shielding surface 202, the second light-shielding surface 302, and the inner hole 40 will have a rough surface that can cause the incident light to form diffuse reflection, that is, the light-shielding layer 50.

[0053] The first light-shielding mechanism 20 and the second light-shielding structure 30 of the light-shielding sheet are coated on the surface of the substrate 10, where the substrate 10 supports the first light-shielding mechanism 20 and the second light-shielding structure 30, which is beneficial to the stability of the light-shielding sheet material. And through the light-shielding layer 50 formed on the surfaces of the first light-shielding mechanism 20, the second light-shielding mechanism 30, and the inner hole 40, the surface reflectivity of the light-shielding sheet material is reduced.

[0054] As an example, in a specific example of the present application, the material of the substrate 10 is polyethylene terephthalate (PET), and the materials of the first light-shielding structure 20 and the second light-shielding structure 30 are carbon layers, which are not easily deformed during the light extinction treatment, and are beneficial to ensuring the light-shielding effect of the light-shielding sheet of the present utility model.

[0055] Specifically, in this preferred embodiment of the present application, the light-shielding layer 50 further includes a first light-shielding layer 51, a second light-shielding layer 52, and an inner-hole light-shielding layer 53. Among them, the first light-shielding layer 51 is a micro-depression structure layer formed by physical light extinction treatment on the first light-shielding surface 202 of the first light-shielding mechanism 20; the second light-shielding layer 52 is a micro-depression structure layer formed by physical light extinction treatment on the second light-shielding surface 302 of the second light-shielding structure 30, and the inner-hole light-shielding layer 53 is a micro-depression structure layer formed by physical light extinction treatment on the surface of the inner hole 40.

[0056] Such as Figure 3As shown, in this preferred embodiment of the present application, let the outer diameter of the extinction light-shielding sheet be M, that is, the outer diameters of the substrate 10, the first light-shielding structure 20, and the second light-shielding structure 30 are M. The outer diameter M of the extinction light-shielding sheet satisfies the relational expression: 0.1 mm ≤ M ≤ 100 mm; the inner diameter of the inner hole 40 is M1, satisfying the relational expression: 0.1 mm < M1 < 100 mm. The outer diameter M of the extinction light-shielding sheet and the inner diameter M1 of the inner hole 40 satisfy the relational expression: 0.05 < (M - M1) / M1 < 1, so that the stamping forming of the extinction light-shielding sheet and during the assembly process are not prone to warping, avoiding negative impacts such as light leakage caused by deformation of the light-shielding sheet, and being beneficial to meeting the actual lens parameter requirements for the light-transmitting aperture of the light-shielding sheet, and not causing deformation and warping during the stamping forming and subsequent extinction treatment of the light-shielding sheet due to the too small annulus of the light-shielding sheet.

[0057] As Figure 3 shown, let the thickness of the extinction light-shielding sheet be T, the thickness of the substrate 10 be t2, the thickness of the first light-shielding structure 20 be t1, and the thickness of the second light-shielding structure 30 be t3. Let the thickness of a single layer of the extinction layer 50 be s. The thickness T of the extinction light-shielding sheet (T = 2*s + t1 + t2 + t3) satisfies 6 μm ≤ T ≤ 100 μm; the thickness t2 of the substrate 10 satisfies the relational expression: 1 μm ≤ t2 ≤ 85 μm, more preferably 4 μm ≤ t2 ≤ 85 μm, and satisfies: 0.01 < t2 / T < 1, which is beneficial for the extinction light-shielding sheet not to deform and warp due to insufficient rigidity caused by too small a proportion of the substrate layer thickness. The thickness t1 of the first light-shielding structure 20 satisfies the relational expression: 2 μm ≤ t1 ≤ 30 μm, and the thickness t3 of the second light-shielding structure 30 satisfies the relational expression: 2 μm ≤ t3 ≤ 30 μm; the thickness t1 of the first light-shielding structure 20 and the thickness t3 of the second light-shielding structure 30 satisfy the relational expression: 0.5 ≤ t1 / t3 ≤ 2.

[0058] Let the thickness s of a single layer of the extinction layer 50 satisfy the relational expression: 0.1 μm ≤ s ≤ 4 μm. The surface roughness before the generation of the inner hole extinction layer 53 is 0.3 ± 0.2, and the surface roughness after the generation of the inner hole extinction layer 53 is 3 ± 0.3.

[0059] In a specific example of the present application, let D1 be the minimum inner diameter of the first light-shielding structure through-hole 201 of the first light-shielding structure 20, D2 be the minimum inner diameter of the substrate through-hole 101 of the substrate 10, and D3 be the minimum inner diameter of the second light-shielding structure through-hole 301 of the second light-shielding structure 30, satisfying D2 ≤ D1 and / or D2 ≤ D3, and 0.5 ≤ D2 / (D1 + D3) ≤ 1. In short, in this preferred embodiment of the present application, the inner diameter size of the substrate through-hole 101 of the substrate 10 is greater than or equal to the inner diameter size of the first light-shielding structure through-hole 201 of the first light-shielding structure 20 and / or the inner diameter size of the substrate through-hole 101 of the substrate 10 is greater than or equal to the inner diameter size of the second light-shielding structure through-hole 301 of the second light-shielding structure 30. It is worth mentioning that compared with the chemical light extinction treatment, the substrate will produce depressions. In this preferred embodiment of the present application, the substrate 10 is between the first light-shielding structure 20 and the second light-shielding structure 30, and the substrate 10 does not have depressions.

[0060] Therefore, satisfying the above characteristics ensures that the inner ring surface of the light extinction and light-shielding sheet is continuous and has no hollow interlayer, which is beneficial to reducing the risk that the depressions of the substrate 10 cause the first light-shielding structure 20 and the second light-shielding structure 30 (carbon layer) to lose support and fall off, forming inner ring gaps, affecting the appearance and light leakage risk.

[0061] Let the maximum inner diameter of the substrate through-hole 101 of the substrate 10 be D21, satisfying D21 ≤ D1 and / or D21 ≤ D3. The inner diameter size of the substrate through-hole 101 of the substrate 10 is greater than or equal to the inner diameter size of the first light-shielding structure through-hole 201 of the first light-shielding structure 20 and / or the inner diameter size of the substrate through-hole 101 of the substrate 10 is greater than or equal to the inner diameter size of the second light-shielding structure through-hole 301 of the second light-shielding structure 30. It can be understood that if the light extinction and light-shielding sheet satisfies the above characteristics, the inner ring surface of the light extinction and light-shielding sheet is continuous and has no hollow interlayer, which is beneficial to reducing the risk that the depressions of the substrate 10 cause the first light-shielding structure 20 and the second light-shielding structure 30 (carbon layer) to lose support and fall off, forming inner ring gaps, affecting the appearance and light leakage risk.

[0062] As Figures 4A to 4D shown, for the light extinction and light-shielding sheet according to the above-mentioned preferred embodiment of the present application, the intersection line of the cross-section of the light extinction and light-shielding sheet and the inner hole 40 can be, but is not limited to, a straight line, an oblique line, an arc or a conical angle.

[0063] As Figure 4AAs shown in the figure, let D1 be the minimum inner diameter of the first light-shielding structure 20, D2 be the minimum inner diameter of the substrate 10, D21 be the maximum inner diameter of the substrate 10, and D3 be the minimum inner diameter of the second light-shielding structure 30, where D1 = D2 = D21 = D3.

[0064] As Figure 4B shown in the figure, let D1 be the minimum inner diameter of the first light-shielding structure 20, D2 be the minimum inner diameter of the substrate 10, D21 be the maximum inner diameter of the substrate 10, and D3 be the minimum inner diameter of the second light-shielding structure 30, where D1 = D21 = D3.

[0065] As Figure 4C shown in the figure, let D1 be the minimum inner diameter of the first light-shielding structure 20, D2 be the minimum inner diameter of the substrate 10, D21 be the maximum inner diameter of the substrate 10, and D3 be the minimum inner diameter of the second light-shielding structure 30, where D1 = D21.

[0066] As Figure 4D shown in the figure, let D1 be the minimum inner diameter of the first light-shielding structure 20, D2 be the minimum inner diameter of the substrate 10, D21 be the maximum inner diameter of the substrate 10, and D3 be the minimum inner diameter of the second light-shielding structure 30, where D1 = D21 = D3.

[0067] It should be noted that the light-shielding film substrate obtained by chemical matting treatment is corroded to produce indentation, so that the space inside the light-shielding film is no longer continuous, which in turn causes the carbon layer on the surface to be suitable for supporting and falling off, and the inner ring has a notch, which affects the appearance and has a risk of light leakage.

[0068] Preferably, in a specific example of the present application, the inner diameter surface of the matting light-shielding film is continuous, that is, the first light-shielding structure through-hole 201, the substrate through-hole 101, and the second light-shielding structure through-hole 301 of the inner hole 40 constituting the matting light-shielding film are sequentially continuous, which is beneficial to eliminating the burrs of the inner hole 40, and further improving the aesthetic degree of the matting light-shielding film and the effect of eliminating stray light. Specifically, among the maximum inner diameter and the minimum inner diameter of the substrate through-hole 101 of the substrate 10, at least one value is equal to D1, and at least one value is equal to D3.

[0069] As Figures 4A to 4D shown in the matting light-shielding film, wherein the matting layer 50 of the matting light-shielding film is formed on the entire surface of the matting light-shielding film, and the thickness s of the matting layer 50 satisfies 0.1μm ≤ s ≤ 4μm.

[0070] The thickness t1 of the first light-shielding structure 20 satisfies: 2 μm ≤ t1 ≤ 30 μm, and the thickness t3 of the second light-shielding structure 30 satisfies the relational expression: 2 μm ≤ t3 ≤ 30 μm, and satisfies: 0 μm ≤ |t1 - t3| ≤ 1 μm, which is beneficial to making the thicknesses of the first light-shielding structure 20 and the second light-shielding structure 30 of the extinction light-shielding sheet closer to each other, facilitating coating processing. At the same time, for the extinction light-shielding sheet, whether the front side or its opposite side is assembled into the lens, the consistency of the stray light effect can be maintained.

[0071] Let the thickness of the extinction layer 50 be s, satisfying: 0.1 μm ≤ s ≤ 4 μm, and the extinction layer 50 is formed on the outer surface of the extinction light-shielding sheet. Preferably, in a specific example of the present application, 0.01 < s / (t1 + t2 + t3) < 0.1. The thickness of the extinction layer 50 of the extinction light-shielding sheet is thinner than the nano-crystalline layer in the prior art, so that the difference in the thickness of the light-shielding sheet after extinction treatment compared with that before treatment is small, and when assembled into a finished lens, this change amount will not affect the performance of the lens itself.

[0072] As Figure 5 shown, it is a comparison schematic before and after the generation of the inner hole extinction layer 53 and a comparison schematic before and after the generation of the first extinction layer 51 and the second extinction layer 52. As Figure 6 shown, since the thickness T of the extinction light-shielding sheet satisfies 6 μm ≤ T ≤ 100 μm, this unit length (i.e., the thickness of the inner hole extinction layer 53) is too small, and relevant testing equipment cannot accurately land to measure its surface roughness. By measuring the roughness before and after the generation of the inner hole extinction layer 53 after stacking multiple light-shielding sheets, the surface roughness before the generation of the inner hole extinction layer 53 is 0.3 ± 0.2, and the surface roughness after the generation of the inner hole extinction layer 53 is 3 ± 0.3. Therefore, it can be understood that setting the extinction layer 50 on the surface of the extinction light-shielding sheet can effectively increase the surface roughness, and this method can effectively block the passage of stray light.

[0073] Those skilled in the art can understand that the spatial distribution of rough surface scattering changes with the increase of roughness. It can be seen that when the roughness is not large, the scattered light is composed of a specular scattering component and a diffuse scattering component. The direction of the specular scattering component is concentrated and the energy is relatively large, corresponding to forming a very strong light spot (i.e., stray light) on the optical imaging surface. The energy of the diffuse scattering component is relatively low and the distribution is relatively uniform, corresponding to forming a relatively weak light spot (i.e., the stray light is weakened or disappears) on the optical imaging surface. Therefore, as the roughness increases, the specular scattering component gradually decays and the diffuse scattering component increases accordingly.

[0074] As Figure 7As shown in the figure, for the light extinction and light shielding sheet of the preferred embodiment of the present application, without changing the surface shape of the inner hole 40 of the light shielding sheet or crystallizing and coating other material layers, the light shielding sheet is subjected to light extinction treatment by a high-frequency grinding machine using grinding auxiliary materials including but not limited to grinding particles, polyacrylic acid, polymerization inhibitors, etc. according to a specific process, increasing the surface roughness of the inner hole 40, and forming the light extinction layer 50 on the surface of the light extinction and light shielding sheet, which can be distinguished from other types of light shielding sheets such as changing the scattering light direction by chamfering the inner hole 40, etching and eliminating the PET layer, and setting a crystalline micro-nano structure to capture scattered light.

[0075] As Figure 8 shown, according to another aspect of the present application, the present application further provides a lens with a light extinction and light shielding sheet, wherein the lens includes a lens barrel 100, a plurality of lenses 200 disposed in the lens barrel 100, and at least one light extinction and light shielding sheet 300 as described above, and the light extinction and light shielding sheet 300 is disposed between two adjacent lenses 200.

[0076] As an example, in a specific example of the present application, the lens 200 includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are sequentially arranged in the lens barrel 100. The light extinction and light shielding sheet 300 is disposed between the first lens and the third lens near the object side of the lens barrel 100. It can be understood that the above-described way of setting the light shielding sheet position is only one of many setting ways, and according to the performance requirements of the lens, the light extinction and light shielding sheet 300 can be disposed between any two adjacent lenses 200.

[0077] It is worth mentioning that the light extinction and light shielding sheet 300 abuts against at least one of the lens 200 or the lens barrel 100. The effective diameter of the image side surface of the adjacent lens 200 on the object side of the light extinction and light shielding sheet 300 is Z, and the inner diameter of the inner hole 40 of the light extinction and light shielding sheet 300 is M1, and 0.85 < M1 / Z < 1 is satisfied. It can be understood that the above parameter characteristics will not cause light leakage when the light shielding sheet is assembled into a finished lens due to too large a design of M1, and will not affect the relative brightness parameter due to too small a design of M1.

[0078] Let the entrance pupil diameter of the lens barrel 100 be D5, and the entrance pupil diameter D5 of the lens barrel 100 is less than or equal to the outer diameter M of the light extinction and light shielding sheet 300 to control the light input of the imaging system and reduce stray light.

[0079] Those skilled in the art should understand that the embodiments of the present utility model described above and shown in the accompanying drawings are only examples and do not limit the present utility model. The object of the present utility model has been completely and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and explained in the embodiments. Without departing from the said principles, any deformation or modification of the implementation manner of the present utility model is possible.

[0080] The technical scope of the present utility model is not limited only to the content in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present utility model, and these deformations and modifications all fall within the protection scope of the present utility model.

Claims

1. Light extinction and light shielding sheet, characterized in that, Comprising: A substrate; A first light-shielding structure and a second light-shielding structure, wherein the first light-shielding structure and the second light-shielding structure are disposed back-to-back on both sides of the substrate. The substrate is provided with a substrate light-transmitting hole, the first light-shielding structure is provided with a first light-shielding structure light-transmitting hole, and the second light-shielding structure is provided with a second light-shielding structure light-transmitting hole. The substrate light-transmitting hole, the first light-shielding structure light-transmitting hole, and the second light-shielding structure light-transmitting hole are coaxial and form the inner hole of the light extinction light-shielding sheet; And A light extinction layer, wherein the light extinction layer is formed on the surfaces of the first light-shielding structure and the second light-shielding structure and the surface of the inner hole. The first light-shielding structure is provided with a first light-shielding surface, the second light-shielding structure is provided with a second light-shielding surface, the inner hole penetrates from the first light-shielding surface of the first light-shielding structure to the second light-shielding surface of the second light-shielding structure, and the first light-shielding surface of the first light-shielding structure and / or the second light-shielding surface of the second light-shielding structure and the surface of the inner hole are formed with the light extinction layer in a physical light extinction manner.

2. The light extinction light-shielding sheet according to claim 1, wherein the light extinction layer is a micro-indentation structure layer formed by physical light extinction treatment.

3. The light extinction light-shielding sheet according to claim 2, wherein the material of the substrate is polyethylene terephthalate, and the materials of the first light-shielding structure and the second light-shielding structure are carbon layers.

4. The light extinction light-shielding sheet according to claim 2, wherein the outer diameter of the light extinction light-shielding sheet is M, and the outer diameter M of the light extinction light-shielding sheet satisfies the relational expression: 0.1 mm ≤ M ≤ 100 mm; the inner diameter of the inner hole is M1, satisfying the relational expression: 0.1 mm < M1 < 100 mm, and satisfying the relational expression: 0.05 < (M - M1) / M1 < 1.

5. The light extinction light-shielding sheet according to claim 2, wherein the thickness of the light extinction light-shielding sheet is T, and the thickness T of the light extinction light-shielding sheet satisfies 6 μm ≤ T ≤ 100 μm; the thickness t2 of the substrate satisfies the relational expression: 1 μm ≤ t2 ≤ 85 μm, and satisfies: 0.01 < t2 / T < 1.

6. The light extinction light-shielding sheet according to claim 5, wherein the thickness t1 of the first light-shielding structure satisfies: 2 μm ≤ t1 ≤ 30 μm, the thickness of the second light-shielding structure is t3, satisfying the relational expression: 2 μm ≤ t3 ≤ 30 μm, and satisfying: 0 μm ≤ |t1 - t3| ≤ 1 μm.

7. The light extinction light-shielding sheet according to claim 6, wherein the light extinction layer of the light extinction light-shielding sheet is formed on the entire surface of the light extinction light-shielding sheet, and the thickness s of the light extinction layer satisfies 0.1 μm ≤ s ≤ 4 μm.

8. The light extinction light-shielding sheet according to claim 7, wherein the thickness s of the light extinction layer, the thickness t1 of the first light-shielding structure, the thickness t2 of the substrate, and the thickness t3 of the second light-shielding structure satisfy the relational expression: 0.01 < s / (t1 + t2 + t3) < 0.

1.

9. The light extinction and light shielding sheet according to claim 2, wherein D1 is the minimum inner diameter of the light transmission hole of the first light shielding structure of the first light shielding structure, D2 is the minimum inner diameter of the light transmission hole of the substrate of the substrate, and D3 is the minimum inner diameter of the light transmission hole of the second light shielding structure of the second light shielding structure, satisfying D2≤D1 and / or D2≤D3, and 0.5≤D2 / (D1+D3)≤1.

10. The light extinction and light shielding sheet according to claim 9, wherein the maximum inner diameter of the light transmission hole of the substrate of the substrate is D21, satisfying D21≤D1 and / or D21≤D3.

11. The light extinction and light shielding sheet according to claim 9, wherein the light transmission holes of the first light shielding structure, the light transmission holes of the substrate, and the light transmission holes of the second light shielding structure of the inner hole forming the light extinction and light shielding sheet are sequentially continuous.

12. A lens, characterized in that, Comprising: A lens barrel; A plurality of lenses, wherein the plurality of lenses are arranged in the lens barrel; And At least one light extinction and light shielding sheet according to any one of claims 1 to 11, wherein the light extinction and light shielding sheet is arranged between two adjacent lenses.

13. The lens according to claim 12, wherein the light extinction and light shielding sheet abuts at least one of the lens or the lens barrel. On the object side of the light extinction and light shielding sheet, the effective diameter of the image side surface of the adjacent lens is Z. The inner diameter of the inner hole of the light extinction and light shielding sheet is M1, and 0.85<M1 / Z<1 is satisfied.

Images