Anti-dazzling screen and optical lens with same

Abstract

The utility model provides an anti-dazzling screen and an optical lens with the same, the anti-dazzling screen is used for blocking light in the optical lens, the anti-dazzling screen sequentially comprises a first carbon layer, a PET layer and a second carbon layer from the object side to the image side of the optical lens, the inner diameter of the PET layer is smaller than the inner diameter of the first carbon layer and the inner diameter of the second carbon layer so as to form an extending part, and the extending part is provided with a light source. The inner ring face of the first carbon layer and the inner ring face of the second carbon layer are provided with a plurality of protruding parts arranged in the circumferential direction of the anti-dazzling screen, and the protruding parts are provided with a plurality of concave-convex structures of different sizes to form rough faces. The anti-dazzling screen solves the problem that stray light of the anti-dazzling screen is seriously generated in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging equipment, in particular to a light shielding sheet and an optical lens having the light shielding sheet. Background Art

[0002] As imaging products develop towards specialization, users' imaging requirements for optical lenses are constantly increasing. A shading sheet is a component used to block or adjust the passage of light. It blocks excess light inside the lens and reduces stray light. The shading sheet substrate commonly used in lenses includes a middle PET layer and two outer carbon layers. The shading sheet is usually formed by stamping, resulting in a smooth inner wall. When light reaches the inner wall of the PET layer, mirror reflection is likely to occur, resulting in serious stray light generated by the shading sheet.

[0003] That is to say, the shading sheet in the prior art has a serious problem of stray light generation. Utility Model Content

[0004] The main purpose of the utility model is to provide a shading sheet and an optical lens having the shading sheet, so as to solve the serious problem of stray light generated by the shading sheet in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a light-shielding sheet is provided, which is used to block light in an optical lens. From the object side to the image side of the optical lens, the light-shielding sheet sequentially includes a first carbon layer, a PET layer and a second carbon layer. The inner diameter of the PET layer is smaller than the inner diameter of the first carbon layer and the inner diameter of the second carbon layer to form an extension portion. The inner annular surface of the first carbon layer and the inner annular surface of the second carbon layer have a plurality of protrusions arranged along the circumference of the light-shielding sheet, and the extension portion has a plurality of concave-convex structures of different sizes to form a rough surface.

[0006] Furthermore, the thickness b of the light shielding sheet and the thickness a of the PET layer satisfy: 0.4

[0007] Furthermore, the inner diameter Φ1 of the first carbon layer, the inner diameter Φm of the PET layer, and the thickness a of the PET layer satisfy: 0<(Φ1-Φm) / (2a)<0.3.

[0008] Furthermore, the inner diameter Φ2 of the second carbon layer, the inner diameter Φm of the PET layer, and the thickness a of the PET layer satisfy: 0<(Φ2-Φm) / (2a)<0.4.

[0009] Furthermore, the thickness H1 of the first carbon layer and the thickness a of the PET layer satisfy: 1.60

[0010] Furthermore, the outer diameter Φ of the light shielding sheet, the inner diameter Φ1 of the first carbon layer, and the inner diameter Φm of the PET layer satisfy the following relationship: 0.1<(Φ-Φ1) / Φm<4.1.​​

[0011] Furthermore, the inner diameter Φ1 of the first carbon layer and the inner diameter Φm of the PET layer satisfy the following relationship: 0 micrometers < (Φ1-Φm) / 2 < 3 micrometers.

[0012] Furthermore, the inner diameter Φ2 of the second carbon layer and the inner diameter Φm of the PET layer satisfy the following relationship: 0 micrometers < (Φ2-Φm) / 2 < 4 micrometers.

[0013] Further, the diameter of the protrusion is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer; and / or

[0014] The diameter of the concavo-convex structure is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer.

[0015] According to another aspect of the present invention, an optical lens is provided. The optical lens includes at least two lenses and the above-mentioned light-shielding sheet.

[0016] By applying the technical solution of the utility model, a shading sheet is used to block light in an optical lens. From the object side to the image side of the optical lens, the shading sheet sequentially includes a first carbon layer, a PET layer, and a second carbon layer. The inner diameter of the PET layer is smaller than the inner diameter of the first carbon layer and the inner diameter of the second carbon layer to form a protruding portion. The inner annular surface of the first carbon layer and the inner annular surface of the second carbon layer have a plurality of protrusions arranged along the circumference of the shading sheet, and the protruding portion has a plurality of concave-convex structures of different sizes to form a rough surface.

[0017] The present application provides a light shielding film. By setting the inner diameter of the PET layer to be smaller than the inner diameter of the first carbon layer and the inner diameter of the second carbon layer on both sides thereof, the two sides of the PET layer close to the optical axis are exposed to form an extension. When light is incident on the object side of the extension, it can be reflected to the first carbon layer for absorption, or when it is incident on the image side of the extension, it can be reflected to the second carbon layer for absorption. A plurality of concave-convex structures of different sizes are arranged on the extension, which greatly increases the roughness of the extension and creates diffuse reflection conditions to weaken stray light. By setting a protruding portion on the inner annular surface of the first carbon layer and the inner annular surface of the second carbon layer, the inner annular surface of the light shielding film is further prevented from generating stray light by mirror reflection, the roughness of the inner annular surface of the light shielding film is increased, the ability of the light shielding film to absorb light is greatly improved, the stray light inside the optical lens is effectively improved, and the application range of the light shielding film is expanded. The present application designs the structure of the light shielding film, which can improve the stray light inside the lens by using the production process without changing the shape of the light shielding film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A microscopic schematic diagram of the inner wall of an optional embodiment of the light shielding sheet of the utility model is shown;

[0020] Figure 2 A schematic diagram of light reflection of an optional embodiment of the light shielding sheet of the utility model is shown;

[0021] Figure 3 A schematic diagram of a carbon layer depression of an optional embodiment of the light shielding sheet of the utility model is shown;

[0022] Figure 4 A schematic diagram showing the outer protrusion of the carbon layer of an optional embodiment of the light shielding sheet of the utility model is shown;

[0023] Figure 5 A parameter diagram of an optional embodiment of the light shielding sheet of the utility model is shown;

[0024] Figure 6 A parameter diagram of the light shielding sheet of the first embodiment of the utility model is shown;

[0025] Figure 7 A schematic diagram showing parameters of a light shielding sheet according to a second embodiment of the present utility model is shown;

[0026] Figure 8 A parameter diagram of a light shielding sheet according to a third embodiment of the present utility model is shown;

[0027] Fig. 9 A schematic diagram showing parameters of a light shielding sheet according to a fourth embodiment of the present utility model is shown;

[0028] Fig.10 A schematic diagram showing parameters of a light shielding sheet according to a fifth embodiment of the present utility model is shown;

[0029] Fig.11 A parameter diagram of the shading sheet of the sixth embodiment of the utility model is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. First carbon layer; 20. PET layer; 21. Protrusion; 22. Concavo-convex structure; 30. Second carbon layer; 40. Protruding portion. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0035] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0037] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side is called the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0038] In order to solve the problem of serious stray light generation in the shading sheet in the prior art, the utility model provides a shading sheet and an optical lens having the shading sheet.

[0039] like Figures 1 to 11 As shown, the shading sheet is used to block light in the optical lens. From the object side to the image side of the optical lens, the shading sheet sequentially includes a first carbon layer 10, a PET layer 20 and a second carbon layer 30. The inner diameter of the PET layer 20 is smaller than the inner diameter of the first carbon layer 10 and the inner diameter of the second carbon layer 30 to form an extension portion 40. The inner annular surface of the first carbon layer 10 and the inner annular surface of the second carbon layer 30 have a plurality of protrusions 21 arranged along the circumference of the shading sheet, and the extension portion 40 has a plurality of concave-convex structures 22 of different sizes to form a rough surface.

[0040] The present application provides a light shielding film. By setting the inner diameter of the PET layer 20 to be smaller than the inner diameter of the first carbon layer 10 and the inner diameter of the second carbon layer 30 on both sides thereof, the two sides of the end of the PET layer 20 close to the optical axis are exposed to the outside to form an extension 40. When light is incident on the object side of the extension 40, it can be reflected to the first carbon layer 10 for absorption, or when it is incident on the image side of the extension 40, it can be reflected to the second carbon layer 30 for absorption. A plurality of concave-convex structures 22 of different sizes are arranged on the extension 40, which greatly increases the roughness of the extension 40, creates diffuse reflection conditions to weaken stray light. By setting a protrusion 21 on the inner annular surface of the first carbon layer 10 and the inner annular surface of the second carbon layer 30, the inner annular surface of the light shielding film is further prevented from generating stray light by specular reflection, the roughness of the inner annular surface of the light shielding film is increased, the light shielding film's ability to absorb light is greatly improved, the stray light inside the optical lens is effectively improved, and the application range of the light shielding film is expanded. The present application designs the structure of the shading sheet so as to improve the stray light inside the lens by utilizing the production process without changing the shape of the shading sheet.

[0041] It should be noted that the concave-convex structure 22 can be provided on the side of the extension 40 facing the optical axis, that is, the inner annular surface of the PET layer 20, and on the two side surfaces of the extension 40 facing the object side and the image side to improve the absorption effect of stray light.

[0042] Optionally, both the protrusion 21 and the concavo-convex structure 22 can be formed by burning the light shielding sheet with a high-temperature light beam during laser cutting.

[0043] Alternatively, if Figure 3 As shown, the first carbon layer 10 and the second carbon layer 30 close to the optical axis can be concave at the end away from the PET layer 20 toward the PET layer 20. Of course, it can also be as shown in FIG. Figure 4 As shown, it is convex in the direction away from the PET layer 20, and the light interception effect is improved through the rich shapes.

[0044] Fig.11 like Figures 1 to 11 As shown, the thickness b of the light shielding sheet and the thickness a of the PET layer 20 satisfy: 0.4

[0045] Fig.11 like Figures 1 to 11 ​As shown, the inner diameter Φ1 of the first carbon layer 10, the inner diameter Φm of the PET layer 20, and the thickness a of the PET layer 20 satisfy: 0<(Φ1-Φm) / (2a)<0.3. By controlling (Φ1-Φm) / (2a) within a reasonable range, the ratio of the length of the PET layer 20 not covered by the first carbon layer 10 to the thickness of the PET layer 20 is controlled to prevent the uncovered length of the PET layer 20 from being too long, which causes the first carbon layer 10 to be unable to absorb the light reflected by the PET layer 20.

[0046] Fig.11 like Figures 1 to 11 As shown, the inner diameter Φ2 of the second carbon layer 30, the inner diameter Φm of the PET layer 20, and the thickness a of the PET layer 20 satisfy: 0<(Φ2-Φm) / (2a)<0.4. By controlling (Φ2-Φm) / (2a) within a reasonable range, the ratio of the length of the PET layer 20 not covered by the second carbon layer 30 to the thickness of the PET layer 20 is controlled, which is conducive to the carbon layer passing through the PET being absorbed by the second carbon layer 30.

[0047] Fig.11 like Figures 1 to 11 As shown, the thickness H1 of the first carbon layer 10 and the thickness a of the PET layer 20 satisfy: 1.60

[0048] Fig.11 like Figures 1 to 11 As shown, the outer diameter Φ of the light shielding sheet, the inner diameter Φ1 of the first carbon layer 10, and the inner diameter Φm of the PET layer 20 satisfy: 0.1<(Φ-Φ1) / Φm<4.1. By controlling (Φ-Φ1) / Φm within a reasonable range, the physical width of the light shielding sheet is prevented from being too small and prone to deformation, thereby ensuring assembly stability.

[0049] Fig.11 like Figures 1 to 11 As shown, the inner diameter Φ1 of the first carbon layer 10 and the inner diameter Φm of the PET layer 20 satisfy: 0 micrometers < (Φ1-Φm) / 2 < 3 micrometers. By controlling (Φ1-Φm) / 2 within a reasonable range, the distance between the inner diameter of the first carbon layer 10 and the inner diameter of the PET layer 20 is controlled, and the light hitting the exposed part of the object side of the PET layer 20 is reduced.

[0050] Fig.11 like Figures 1 to 11 ​As shown, the inner diameter Φ2 of the second carbon layer 30 and the inner diameter Φm of the PET layer 20 satisfy: 0 micrometers < (Φ2-Φm) / 2 < 4 micrometers. By controlling (Φ2-Φm) / 2 within a reasonable range, the distance between the inner diameter of the second carbon layer 30 and the inner diameter of the PET layer 20 can be limited, and the amount of light received by the exposed portion of the image side of the PET layer 20 can be reduced.

[0051] Fig.11 Specifically, the diameter of the protrusion 21 is greater than or equal to 0.1 micron and less than or equal to 1 micron, and the diameter of the concave-convex structure 22 can also be controlled to be greater than or equal to 0.1 micron and less than or equal to 1 micron. By controlling the diameter range of the protrusion 21 and the concave-convex structure 22, the light absorption efficiency can be effectively adjusted.

[0052] The present application also provides an optical lens, which includes at least two lenses and the above-mentioned shading sheet. The optical lens of the present application can achieve a good stray light elimination effect under the diffuse reflection and absorption interception of stray light by the shading sheet, so as to improve the imaging quality of the optical lens.

[0053] Embodiment 1

[0054] like Figure 6 As shown, the shading film of the first embodiment of the present application is described.

[0055] like Figure 6 As shown, the shading sheet is used to block light in the optical lens. From the object side to the image side of the optical lens, the shading sheet sequentially includes a first carbon layer 10, a PET layer 20 and a second carbon layer 30. The inner diameter of the PET layer 20 is smaller than the inner diameter of the first carbon layer 10 and the inner diameter of the second carbon layer 30 to form an extension portion 40. The inner annular surface of the first carbon layer 10 and the inner annular surface of the second carbon layer 30 have a plurality of protrusions 21 arranged along the circumference of the shading sheet, and the extension portion 40 has a plurality of concave-convex structures 22 of different sizes to form a rough surface.

[0056] Table 1 below shows the basic structural parameters of the shading sheet of the first embodiment.

[0057] Example / Parameters (mm) Φ1 Φ2 Φm a b Φ H1 1 0.895 0.894 0.890 0.016 0.022 1.500 0.003

[0058] Table 1

[0059] Table 2 shows the values ​​of various conditional expressions in the first embodiment.

[0060]

[0061] Table 2

[0062] Embodiment 2

[0063] like Figure 7As shown, the shading sheet of the second embodiment of the present application is described, and the difference from the first embodiment is that the size of the shading sheet and the distribution of the protrusions 21 and the concave-convex structure 22 are different.

[0064] Figure 7 Table 3 below shows the basic structural parameters of the shading sheet of the second embodiment.

[0065] Example / Parameters Φ1 Φ2 Φm a b Φ H1 2 0.400 0.399 0.397 0.008 0.016 2.000 0.004

[0066] Table 3

[0067] Table 4 shows the values ​​of each conditional expression in the second embodiment.

[0068] Example / Conditional a / b (Φ1-Φm) / (2a) (Φ2-Φm) / (2a) a / H1 (Φ-Φ1) / Φm (Φ1-Φm) / 2(micrometer) (Φ2-Φm) / 2(micrometer) 2 0.50 0.19 0.13 2.00 4.03 1.50 1.00

[0069] Table 4

[0070] Embodiment 3

[0071] like Figure 8 As shown, the shading sheet of the third embodiment of the present application is described, and the difference from the first embodiment is that the size of the shading sheet and the distribution of the protrusions 21 and the concave-convex structure 22 are different.

[0072] Figure 8 Table 5 below shows the basic structural parameters of the light shielding sheet of the third embodiment.

[0073] Example / Parameters Φ1 Φ2 Φm a b Φ H1 3 4.414 4.416 4.410 0.023 0.033 5.000 0.005

[0074] Table 5

[0075] Table 6 shows the values ​​of each conditional expression in the third embodiment.

[0076] Example / Conditional a / b (Φ1-Φm) / (2a) (Φ2-Φm) / (2a) a / H1 (Φ-Φ1) / Φm (Φ1-Φm) / 2(micrometer) (Φ2-Φm) / 2(micrometer) 3 0.70 0.09 0.13 4.60 0.13 2.00 3.00

[0077] Table 6

[0078] Embodiment 4

[0079] like Fig. 9 As shown, the shading sheet of the fourth embodiment of the present application is described, and the difference from the first embodiment is that the size of the shading sheet and the distribution of the protrusion 21 and the concave-convex structure 22 are different.

[0080] Fig. 9 Table 7 below shows the basic structural parameters of the shading sheet of the fourth embodiment.

[0081] Example / Parameters Φ1 Φ2 Φm a b Φ H1 4 9.369 9.371 9.364 0.009 0.019 12.000 0.005

[0082] Table 7

[0083] Table 8 shows the values ​​of each conditional expression in the fourth embodiment.

[0084] Example / Conditional a / b (Φ1-Φm) / (2a) (Φ2-Φm) / (2a) a / H1 (Φ-Φ1) / Φm (Φ1-Φm) / 2(micrometer) (Φ2-Φm) / 2(micrometer) 5 0.78 0.04 0.04 7.00 0.56 0.50 0.50

[0085] Table 8

[0086] Embodiment 5

[0087] like Fig.10 As shown, the shading sheet of the fifth embodiment of the present application is described, and the difference from the first embodiment is that the size of the shading sheet and the distribution of the protrusion 21 and the concave-convex structure 22 are different.

[0088] Fig.10 Table 9 below shows the basic structural parameters of the shading sheet of the fifth embodiment.

[0089] Example / Parameters Φ1 Φ2 Φm a b Φ H1 5 4.476 4.476 4.475 0.014 0.018 7.000 0.002

[0090] Table 9

[0091] Table 10 shows the values ​​of each conditional expression in the fifth embodiment.

[0092] Example / Conditional a / b (Φ1-Φm) / (2a) (Φ2-Φm) / (2a) a / H1 (Φ-Φ1) / Φm (Φ1-Φm) / 2(micrometer) (Φ2-Φm) / 2(micrometer) 5 0.78 0.04 0.04 7.00 0.56 0.50 0.50

[0093] Table 10

[0094] Embodiment 6

[0095] like Fig.11 As shown, the shading sheet of the sixth embodiment of the present application is described, and the difference from the first embodiment is that the size of the shading sheet and the distribution of the protrusion 21 and the concave-convex structure 22 are different.

[0096] Fig.11 Table 11 below shows the basic structural parameters of the shading sheet of Example 6.

[0097] Example / Parameters Φ1 Φ2 Φm a b Φ H1 6 1.794 1.800 1.793 0.015 0.033 3.000 0.009

[0098] Table 11

[0099] Table 12 shows the values ​​of the conditional expressions in the sixth embodiment.

[0100] Example / Conditional a / b (Φ1-Φm) / (2a) (Φ2-Φm) / (2a) a / H1 (Φ-Φ1) / Φm (Φ1-Φm) / 2(micrometer) (Φ2-Φm) / 2(micrometer) 6 0.45 0.03 0.23 1.67 0.67 0.50 3.50

[0101] Table 12

[0102] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0103] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0104] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0105] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A shading sheet, characterized in that: The light shielding sheet is used to shield light in an optical lens. From the object side to the image side of the optical lens, the light shielding sheet comprises a first carbon layer (10), a PET layer (20) and a second carbon layer (30) in sequence. The inner diameter of the PET layer (20) is smaller than the inner diameter of the first carbon layer (10) and the inner diameter of the second carbon layer (30) to form a protruding portion (40). The inner annular surface of the first carbon layer (10) and the inner annular surface of the second carbon layer (30) have a plurality of protruding portions (21) arranged along the circumference of the light shielding sheet. The protruding portion (40) has a plurality of concave-convex structures (22) of different sizes to form a rough surface.

2. The shading sheet according to claim 1, characterized in that: The thickness b of the shading sheet and the thickness a of the PET layer (20) satisfy the following relationship: 0.

4. The inner diameter Φ1 of the first carbon layer (10), the inner diameter Φm of the PET layer (20), and the thickness a of the PET layer (20) satisfy the following relationship: 0<(Φ1-Φm) / (2a)<0.

3.

3. The shading sheet according to claim 1, characterized in that: The inner diameter Φ2 of the second carbon layer (30), the inner diameter Φm of the PET layer (20), and the thickness a of the PET layer (20) satisfy the following relationship: 0<(Φ2-Φm) / (2a)<0.

4.

4. The shading sheet according to claim 1, characterized in that: The thickness H1 of the first carbon layer (10) and the thickness a of the PET layer (20) satisfy the following relationship: 1.60; the outer diameter Φ of the shading sheet, the inner diameter Φ1 of the first carbon layer (10), and the inner diameter Φm of the PET layer (20) satisfy the following relationship: 0.1<(Φ-Φ1) / Φm<4.

1.

5. The light shielding sheet according to claim 1, characterized in that: The inner diameter Φ1 of the first carbon layer (10) and the inner diameter Φm of the PET layer (20) satisfy the following relationship: 0 micrometers < (Φ1-Φm) / 2 < 3 micrometers.

6. The light shielding sheet according to claim 1, characterized in that: The inner diameter Φ2 of the second carbon layer (30) and the inner diameter Φm of the PET layer (20) satisfy the following relationship: 0 micrometers < (Φ2-Φm) / 2 < 4 micrometers.

7. The shading sheet according to any one of claims 1 to 6, characterized in that:

9. The shading sheet according to any one of claims 1 to 6, characterized in that:

8. The shading sheet according to any one of claims 1 to 6, characterized in that: The diameter of the protrusion (21) is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer; and / or The diameter of the concavo-convex structure (22) is greater than or equal to 0.1 micrometer and less than or equal to 1 micrometer. The optical lens comprises at least two lenses and a light shielding sheet as described in any one of claims 1-9. ​ 10. An optical lens, characterized in that: ​

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