Optical element, assembly and optical lens

Abstract

The utility model provides an optical element, an optical assembly and an optical lens. The optical element comprises an outer ring surface far away from an optical axis; the inner ring surface is close to the optical axis, the inner ring surface is an inclined surface, a plurality of extinction structures arranged at intervals are arranged on the inner ring surface, any extinction structure is composed of a plurality of tooth grooves, and the tooth groove section shapes of the extinction structures on the same inner ring surface comprise one or more types; the object side surface and the image side surface are connected with the outer ring surface and the inner ring surface; the extinction structures on the inner ring surface are irregularly arranged at intervals or uniformly arranged at intervals; the tooth groove section shape of the extinction structure comprises one or more of an irregular triangular tooth groove, an irregular trapezoidal tooth groove, an irregular arc-shaped tooth groove and an irregular rectangular tooth groove. The light reflectivity of the optical element is less than or equal to 10%; at least five tooth grooves are contained in any radian with the angle of 45 degrees on the inner ring face. According to the utility model, stray light related to the pressing ring can be improved and weakened, and the structure strength is enough.

Description

Technical Field

[0001] The utility model relates to the field of optical elements, and in particular to an optical element, a component and an optical lens. Background Art

[0002] In recent years, with the advancement of science and technology, smartphones have been continuously iterated and developed. Mobile phone camera technology is an important part of mobile phone technology, and its imaging performance has also been continuously improved. At present, the main camera lenses of mainstream mobile phones will use multi-lens large-surface lenses with higher imaging performance. In order to ensure its better reliability and stray light quality, it is necessary to add a ring-shaped optical element behind the last lens to fix it. On the one hand, it can improve stability and performance quality, and on the other hand, it can improve bad stray light and make the image quality better. Usually, the lens pressure ring is glued and fixed to the lens barrel to achieve the effect of fastening the lens in the Z direction and improve the stability of the lens after assembly.

[0003] After using the lens ring, stray light associated with the ring is generated synchronously, affecting the imaging quality of the lens. The stray light mainly includes the stray light reflected by the module color filter and the inner diameter surface of the lens ring; the stray light reflected by the inner diameter surface of the lens ring and the lens; and the primary reflected stray light directly reflected by the inner diameter surface of the lens ring.

[0004] In the prior art, a Chinese utility model patent with publication number CN216118328U discloses an optical element, including an inner annular surface and an outer annular surface, wherein the inner annular surface has at least one groove structure, which extends along the circumference of the inner annular surface and is connected end to end to form an annular groove structure; and a tooth groove structure, which is arranged on the surface of the annular groove structure.

[0005] However, due to the large number of tooth-groove structures, the optical element of the above technical solution has poor structural strength. Therefore, it is necessary to design an optical element that can improve the reduction of stray light related to the pressure ring and has sufficient structural strength. Utility Model Content

[0006] The utility model aims to provide an optical element, a component and an optical lens, which can improve and reduce the stray light related to the pressure ring and have sufficient structural strength.

[0007] In order to achieve the above-mentioned purpose of the utility model, the utility model provides an optical element, which is ring-shaped and includes:

[0008] The outer annular surface away from the optical axis;

[0009] An inner annular surface close to the optical axis, the inner annular surface being an inclined surface, the inner annular surface being provided with a plurality of matting structures arranged at intervals, any of the matting structures being composed of a plurality of tooth grooves, and the tooth groove cross-sectional shapes of the matting structures on the inner annular surface including one or more;

[0010] An object-side surface and an image-side surface connecting the outer annular surface and the inner annular surface;

[0011] The matting structures on the inner annular surface are arranged at irregular intervals or at even intervals;

[0012] The cross-sectional shape of the tooth grooves of the matting structure includes one or more of irregular triangular tooth grooves, irregular trapezoidal tooth grooves, irregular arc-shaped tooth grooves, and irregular rectangular tooth grooves;

[0013] The light reflectivity of the optical element is less than or equal to 10%;

[0014] Any arc with an angle of 45° on the inner annular surface contains at least 5 tooth grooves.

[0015] According to a technical solution of the utility model, the inner annular surface is stepped, including a plurality of step portions and a connecting portion between two of the step portions, and the matte structure is arranged at one of the connecting portions.

[0016] According to a technical solution of the utility model, the shortest distance D1 from the object side to the optical axis and the shortest distance D2 from the image side to the optical axis satisfy the following relationship: 0.5 <D1 / D2<0.99。

[0017] According to a technical solution of the present invention, the shortest distance D3 from one end of the extinction structure close to the object side surface to the optical axis and the shortest distance D4 from one end of the extinction structure close to the image side surface to the optical axis satisfy the following relationship: 0<(D4-D3) / D3<0.3.

[0018] According to a technical solution of the utility model, the cross-sectional shape of the tooth groove of the matte structure is a triangle or a trapezoid, and the angle a between the oblique sides of two adjacent tooth grooves satisfies the following relationship: 50°<a<70°.

[0019] According to a technical solution of the utility model, the maximum width d of the optical element in the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface satisfy the following relationship: 0.4<f / d<0.7.

[0020] According to a technical solution of the utility model, the maximum width d and the minimum width e of the optical element in the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface satisfy the following relationship: 0.7<(e+f) / d<0.9.

[0021] According to one aspect of the utility model, an optical element assembly is provided, comprising:

[0022] At least two optical elements as described in any one of the above technical solutions are arranged closely in the same direction.

[0023] According to a technical solution of the utility model, two adjacent optical elements are arranged with a coaxial offset.

[0024] According to one aspect of the utility model, an optical lens is provided, comprising:

[0025] Lens tube;

[0026] A plurality of lenses are arranged in intervals in the lens barrel;

[0027] A plurality of optical elements as described in any one of the above technical solutions and / or an optical element assembly as described in any one of the above technical solutions.

[0028] According to a technical solution of the present invention, the effective radius DT of the image side surface of the lens closest to the object side surface of the optical element and the shortest distance D1 from the optical element to the optical axis satisfy the following relationship: 0.8<DT / D1<1.

[0029] According to a technical solution of the utility model, the maximum light emission angle b of the lens image side closest to the object side of the optical element and the angle c between the inner annular surface where the optical element is located and the optical axis satisfy the following relationship: 1<b / c<3.

[0030] According to a technical solution of the utility model, the number S of the optical elements included in the optical lens satisfies the following relationship: 1≤S≤5.

[0031] According to an idea of ​​the utility model, an optical element, an assembly and an optical lens are proposed. By providing an extinction structure on the inner annular surface of the optical element, the original reflection path of the light path is broken up and the reflected energy of the light is weakened, thereby eliminating the stray light of the optical system and the filter to achieve a clear and optimized effect. Multiple extinction structures are arranged at intervals. While improving the stray light, they avoid damaging the structure of the optical element itself, making the optical element relatively thicker, ensuring the structural strength, greatly reducing the risk of deformation of the optical element, facilitating product molding and assembly, and having a better extinction effect.

[0032] The optical element (spacer or pressure ring) is made of plastic, with a light transmittance of 0 and a reflectivity of 10%. It helps to control the complete state of light transmission to the first lens, and ensures the uniformity of light divergence from the first lens to the image plane, improving the overall quality of the image. The last pressure ring has a light transmittance of 0, which can block the stray light generated by the last lens, and fix the entire lens after assembly, improving the overall reliability of the lens.

[0033] By setting irregular and unevenly distributed tooth groove microstructures on the inner diameter surface of the optical element and reducing the number of tooth grooves, the processing and demolding difficulty of the pressing ring molding mold can be effectively reduced, and the molding of the pressing ring microstructure can be ensured. However, if too many tooth grooves are arranged and the entire circle of regular tooth groove microstructures is formed, the overall structural strength of the optical element will be reduced, causing the risk of deformation during assembly, resulting in risks such as glue seepage and crooked installation of optical elements. Optical elements with irregular tooth grooves can eliminate the tooth groove structure on the stray light non-sensitive surface, which can not only enhance the structural strength of the pressing ring, but also facilitate the molding and demolding of the pressing ring itself, and avoid the deformation problem of the pressing ring during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic cross-sectional view of an optical lens equipped with an optical element according to an embodiment of the utility model is shown;

[0036] Figure 2 A schematic diagram schematically shows an optical element with irregular triangular teeth and grooves according to Example 1 of one embodiment of the utility model;

[0037] Figure 3 A schematic cross-sectional identification diagram of an optical lens equipped with an optical element according to an embodiment of the utility model is schematically shown;

[0038] Figure 4 A schematic diagram schematically showing an identification diagram of an optical element according to an embodiment of the utility model;

[0039] Figure 5 Another schematic diagram schematically showing an optical element according to an embodiment of the present utility model;

[0040] Figure 6 A schematic diagram schematically showing another identification diagram of an optical element according to an embodiment of the utility model;

[0041] Figure 7 Schematically showing an enlarged view of a triangular tooth groove according to Example 1 of one embodiment of the utility model;

[0042] Figure 8 A schematic diagram schematically shows an optical element with irregular trapezoidal tooth grooves according to Example 2 of an implementation manner of the utility model;

[0043] Fig. 9 A schematic diagram schematically shows an optical element with irregular arc-shaped tooth grooves according to Example 3 of an implementation manner of the utility model;

[0044] Fig.10 A schematic diagram schematically showing an optical element with irregular rectangular tooth grooves according to Example 4 of an implementation manner of the utility model;

[0045] Fig.11 A schematic diagram schematically shows an optical element with a combination (full coverage) of irregular triangular tooth grooves and trapezoidal tooth grooves according to Example 5 of an implementation mode of the utility model;

[0046] Fig.12 A schematic diagram schematically shows an optical element with a combination of irregular triangular tooth grooves and trapezoidal tooth grooves (not fully covered) according to Example 5 of an implementation manner of the utility model;

[0047] Fig.13 A schematic diagram schematically shows an optical element with irregular triangular tooth grooves and arc-shaped tooth grooves according to Example 6 of an implementation mode of the utility model;

[0048] Fig.14 A schematic diagram schematically shows an optical element with irregular triangular tooth grooves and arc-shaped tooth grooves according to Example 7 of an implementation mode of the utility model;

[0049] Fig.15 A schematic perspective view of an optical element assembly with combined superimposed teeth and grooves according to Example 8 of an implementation manner of the utility model;

[0050] Fig.16 A schematic cross-sectional view of an optical element assembly with combined superimposed teeth and grooves according to Example 8 of an implementation manner of the utility model is shown;

[0051] Fig.17 Schematic representation of the stray light path diagram of conventional optical components;

[0052] Fig.18 Schematic representation of the stray light spot diagram of conventional optical components;

[0053] Fig.19 A schematic diagram showing a stray light optical path diagram using the optical element of the utility model;

[0054] Fig. 20 Schematically showing the stray light spot diagram of the optical element using the utility model;

[0055] Fig.21 Schematically showing the stray light path diagram of another conventional optical element;

[0056] Fig. 22Schematically showing the stray light spot diagram of another conventional optical element;

[0057] Fig.23 The stray light optical path diagram using the optical element of the eighth embodiment is schematically shown;

[0058] Fig.24 The stray light spot diagram of the optical element of the eighth embodiment is schematically shown.

[0059] Reference numerals:

[0060] 1. Outer annular surface; 2. Inner annular surface; 3. Object side surface; 4. Image side surface; 5. Matte structure. DETAILED DESCRIPTION

[0061] The description of the embodiments of this specification should be combined with the corresponding drawings, which should be considered as part of the complete specification. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated for simplification or convenience. Furthermore, the parts of each structure in the drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described in words are in a form known to ordinary technicians in the relevant technical field.

[0062] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0063] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0064] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. The implementation methods cannot be described one by one here, but the implementation methods of the present invention are not therefore limited to the following implementation methods.

[0065] like Figures 1 to 24 As shown, according to an embodiment of the present invention, the present invention provides an optical element, the optical element may be a pressure ring or a spacer ring, and the optical element is ring-shaped and includes:

[0066] An outer annular surface 1 away from the optical axis;

[0067] An inner ring surface 2 close to the optical axis, the inner ring surface 2 is an inclined surface, a plurality of matting structures 5 are arranged at intervals on the inner ring surface 2, any matting structure 5 is composed of a plurality of tooth grooves, and the tooth groove cross-sectional shapes of the matting structure 5 on the inner ring surface 2 include one or more;

[0068] The object side surface 3 and the image side surface 4 connect the outer annular surface 1 and the inner annular surface 2.

[0069] By providing a matting structure 5 on the inner annular surface 2 of the optical element, the original reflection path of the light path is broken up and the reflected energy of the light is weakened, thereby eliminating the stray light of the optical system and the filter to achieve a clear and optimized effect. Multiple matting structures 5 are arranged at intervals. While improving the stray light, it avoids damaging the structure of the optical element itself, making the thickness of the optical element relatively thicker, ensuring the structural strength, greatly reducing the risk of deformation of the optical element, facilitating product molding and assembly, and having a better matting effect.

[0070] Furthermore, by arranging an irregular tooth groove structure design, it is possible to avoid excessive demoulding force affecting the accuracy of the supporting surface and the mating surface of the optical element, thereby enhancing the overall stability and reliability of the assembly.

[0071] In some embodiments of the utility model, the optical element (spacer or pressure ring) is made of plastic, with a light transmittance of 0 and a light reflectance of less than or equal to 10%; it helps to control the complete state of light transmission to the first lens, and ensure the uniformity of light divergence from the first lens to the image plane, thereby improving the overall quality of the image. The last pressure ring has a light transmittance of 0, which can block the stray light generated by the last lens, and can also fix the entire lens after assembly, thereby improving the overall reliability of the lens.

[0072] In some embodiments of the present invention, any arc with an angle of 45° on the inner annular surface 2 includes at least 5 tooth grooves.

[0073] By setting irregular and unevenly distributed tooth groove microstructures on the inner ring surface of the optical element and reducing the number of tooth grooves, the processing and demolding difficulty of the pressing ring molding mold can be effectively reduced, and the molding of the pressing ring microstructure can be ensured. However, if too many tooth grooves are arranged and the entire circle of regular tooth groove microstructures is formed, the overall structural strength of the optical element will be reduced, causing the risk of deformation during assembly, resulting in risks such as glue seepage and crooked installation of optical elements. Optical elements with irregular tooth grooves can eliminate the tooth groove structure on the non-sensitive surface of stray light, which can not only enhance the structural strength of the pressing ring, but also facilitate the molding and demolding of the pressing ring itself, and avoid the deformation problem of the pressing ring during assembly.

[0074] In some embodiments of the present invention, the shortest distance D1 from the object side surface 3 to the optical axis and the shortest distance D2 from the image side surface 4 to the optical axis satisfy the following relationship: 0.5 <D1 / D2<0.99;

[0075] The shortest distance D3 from one end of the extinction structure close to the object side surface 3 to the optical axis and the shortest distance D4 from one end of the extinction structure close to the image side surface 4 to the optical axis satisfy the following relationship: 0<(D4-D3) / D3<0.3.

[0076] By limiting the ratio range of the shortest distance D1 from the object side surface 3 to the optical axis and the shortest distance D2 from the image side surface 4 to the optical axis, as well as the proportional relationship between the shortest distance D3 from the end of the extinction structure close to the object side surface 3 to the optical axis and the shortest distance D4 from the end of the extinction structure close to the image side surface 4 to the optical axis, light rays are allowed to diverge in sequence, which can not only ensure sufficient relative illumination, but also stabilize the molding of optical elements, improve the stability and reliability of the overall assembly of the lens, make the optical elements and the lens more compatible, greatly improve the yield rate of qualified products, and thus save a lot of cost and time.

[0077] The object-side surface 3 is a surface of the optical element close to the object, and the image-side surface 4 is a surface of the optical element away from the object.

[0078] In some embodiments of the present invention, the inner annular surface 2 is stepped, including a plurality of step portions and a connecting portion between two step portions, and the matte structure 5 is disposed at one of the connecting portions.

[0079] Setting the inner annular surface 2 in a stepped shape can effectively reduce the weight of the optical element while ensuring the supporting strength of the optical element, which is conducive to making the optical element lighter and thinner.

[0080] In some embodiments of the present invention, the matte structures 5 on the inner annular surface 2 are arranged at irregular intervals or at uniform intervals.

[0081] Among them, the irregular spacing setting means that the distance between any two adjacent extinction structures 5 is not equal, which is more conducive to breaking up the original reflection path of the light path, weakening the light reflection energy, and achieving a clear optimization effect; while the uniform spacing setting method is more conducive to production and improves production efficiency.

[0082] In some embodiments of the present invention, the cross-sectional shape of the tooth grooves of the matting structure 5 includes one or more of irregular triangular tooth grooves, irregular trapezoidal tooth grooves, irregular arc-shaped tooth grooves, and irregular rectangular tooth grooves.

[0083] In some embodiments of the present invention, the cross-sectional shape of the tooth groove of the extinction structure 5 is triangular or trapezoidal, and the angle a between the hypotenuses of two adjacent tooth grooves satisfies the following relationship: 50°<a<70°; by controlling this size, it helps to form the triangular tooth grooves and trapezoidal tooth grooves, and ensures the accuracy of the size during the processing process. If the size is too small, it is easy to cause molding deformation, and if the size is too large, it will lead to poor interruption of the stray light path, affecting its light blocking performance, resulting in poor imaging quality.

[0084] like Figure 6 As shown, in some embodiments of the present invention, the maximum width d of the optical element along the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface 2 satisfy the following relationship: 0.4<f / d<0.7; by reasonably controlling the ratio of the maximum width d of the optical element along the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface 2, the inclination angle of the inner diameter slope of the pressing ring can be adjusted. If the inclination angle is too large, it will easily lead to an increase in the contact area with the reflected light path between the color filter and an increase in the stray light spot.

[0085] In some embodiments of the present invention, the maximum width d and the minimum width e of the optical element in the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface 2 satisfy the following relationship: 0.7<(e+f) / d<0.9; in the assembly stage of the optical lens, by controlling the above-mentioned proportional relationship, when it is necessary to identify the direction of the lens, the irregular tooth groove structure can effectively help identify the direction of the optical lens, which is beneficial to ensure the assembly consistency of the optical lens.

[0086] Figure 6 In order to clearly describe the dimensional features, an inclined plane is used instead of a step-like structure.

[0087] The optical element of the present invention is described below with reference to specific embodiments.

[0088] Embodiment 1

[0089] like Figure 2 , Figure 7 , Fig.19 and Fig. 20 As shown, the optical element includes a matting structure 5 formed by an irregular triangular tooth-groove structure, and specific parameters are shown in Table 1 below.

[0090] a b c d e f D1 D2 D3 D4 60° 27.4° 24° 0.5 0.17 0.24 4.96 5.18 5.07 5.15

[0091] Table 1

[0092] Embodiment 2

[0093] like Figure 8 As shown, the optical element includes a matte structure 5 formed by an irregular trapezoidal tooth groove structure; specific parameters are shown in Table 2 below.

[0094] a b c d e f D1 D2 D3 D4 55° 27.4° 25° 0.4 0.18 0.2 4.96 5.18 5.07 5.15

[0095] Table 2

[0096] Embodiment 3

[0097] like Fig. 9 As shown, the optical element includes a matte structure 5 formed by an irregular arc-shaped tooth groove structure; the specific parameters are shown in Table 3 below.

[0098] a b c d e f D1 D2 D3 D4 50° 27.4° 26° 0.3 0.15 0.18 4.96 5.18 5.07 5.15

[0099] Table 3

[0100] Embodiment 4

[0101] like Fig.10 As shown, the optical element includes a matte structure 5 formed by an irregular rectangular tooth groove structure; the specific parameters are shown in Table 4 below.

[0102] a b c d e f D1 D2 D3 D4 55° 27.4° 25° 0.3 0.16 0.2 4.96 5.18 5.07 5.15

[0103] Table 4

[0104] Embodiment 5

[0105] like Fig.11 and Fig.12 As shown, a combination structure of irregular triangular and trapezoidal tooth grooves is adopted, and the matte structure 5 of the inner ring surface 2 includes both irregular triangular tooth grooves and trapezoidal tooth grooves; the specific parameters are as follows

[0106] As shown in Table 5.

[0107] a b c d e f D1 D2 D3 D4 Irregular triangle 60° 27.4° 18° 0.5 0.17 0.24 4.96 5.32 5.11 5.23 Irregular trapezoid 50° 27.4° 18° 0.4 0.18 0.2 4.96 5.32 5.11 5.23

[0108] Table 5

[0109] Embodiment 6

[0110] like Fig.13 As shown, a combination structure of irregular triangular and arc-shaped tooth grooves is adopted, and the matte structure 5 of the inner ring surface 2 includes both irregular triangular tooth grooves and arc-shaped tooth grooves; the specific parameters are shown in Table 6 below.

[0111] a b c d e f D1 D2 D3 D4 Irregular triangle 60° 27.4° 15° 0.5 0.17 0.24 4.96 5.32 5.11 5.23 Irregular arc 50° 27.4° 15° 0.3 0.15 0.18 4.96 5.32 5.11 5.23

[0112] Table 6

[0113] Embodiment 7

[0114] like Fig.14 As shown, a combination structure of irregular trapezoidal and arcuate tooth grooves is adopted, and the matte structure 5 of the inner ring surface 2 includes both irregular trapezoidal tooth grooves and arcuate tooth grooves; the specific parameters are shown in Table 7 below.

[0115] a b c d e f D1 D2 D3 D4 Irregular trapezoid 55° 27.4° 17° 0.4 0.18 0.2 4.96 5.32 5.11 5.23 Irregular arc 50° 27.4° 14° 0.3 0.15 0.18 4.96 5.32 5.11 5.23

[0116] Table 7

[0117] According to one aspect of the utility model, an optical element assembly is provided, comprising:

[0118] At least two optical elements as described in any one of the above technical solutions are arranged closely in the same direction.

[0119] In some embodiments of the utility model, two adjacent optical elements are staggered on the same optical axis to ensure the coaxiality of the optical lens. At the same time, two optical elements with irregular teeth are staggered and superimposed to ensure that the incident angle of any light is covered with a tooth structure that eliminates stray light, which can not only break up the original reflection path of the light path at all angles and weaken the reflected energy of the light to achieve a clear and optimized effect, but also ensure that the difficulty of forming and assembling the optical elements is controllable.

[0120] Furthermore, the size of the optical element closer to the image plane of the lens is slightly larger than that of the optical element farther from the image plane of the lens.

[0121] Embodiment 8

[0122] The optical element assembly can be any two of the above or a superposition of two single-loop structures of the same shape. Here is one example, Fig.15 , Fig.16 , Fig.23 and Fig.24 As shown, it contains 2 optical elements of the above-mentioned embodiment 1.

[0123] Fig.15 and Fig.16 In the method, two pressure rings are used in combination, and two pressure rings with the same type of teeth can be used. The irregular triangular tooth groove pressure ring structure in Example 1 is used as the first pressure ring, which is the base state; and another irregular triangular tooth groove pressure ring structure with a slightly larger outer diameter in Example 1 is used as the second pressure ring combination, which is the superposition state. The two pressure rings are used in combination so that the non-tooth groove microstructure parts inside the pressure ring complement each other to form a tooth groove structure that superimposes a full circle or exceeds the full circle, thereby enhancing the improvement of stray light reflected by the inner diameter surface of the pressure ring, and making the improvement effect better. Other types of tooth groove pressure rings can be used by analogy, and the specific parameters are shown in Table 8 below.

[0124]

[0125] Table 8

[0126] Similarly, the irregular trapezoidal tooth groove pressure ring structure in the second embodiment can also be used in combination, and the specific parameters are shown in Table 9 below.

[0127]

[0128] Table 9

[0129] According to one aspect of the utility model, an optical lens is provided, comprising:

[0130] Lens tube;

[0131] A plurality of lenses are arranged in intervals in the lens barrel;

[0132] A plurality of optical elements as in any one of the above technical solutions and / or an optical element assembly as in any one of the above technical solutions.

[0133] In some embodiments of the present invention, the effective radius DT of the image side surface of the lens closest to the object side surface 3 of the optical element and the shortest distance D1 from the optical element to the optical axis satisfy the following relationship: 0.8<DT / D1<1.

[0134] By controlling the effective radius size of the lens closest to the object side 3 of the optical element, interference between the lens and the optical element is avoided, thereby reducing assembly errors and improving assembly stability. At the same time, the light clearance of the lens and the optical element can be guaranteed, allowing light to pass through here to the greatest extent, thereby improving the overall light intensity.

[0135] In some embodiments of the present invention, the maximum light emission angle b of the lens image side closest to the object side 3 of the optical element and the angle c between the inner annular surface 2 where the optical element is located and the optical axis satisfy the following relationship: 1<b / c<3.

[0136] In some embodiments of the present invention, the number S of optical elements included in the optical lens satisfies the following relationship: 1≤S≤5.

[0137] By using an optical element with an irregular tooth-groove structure, the irregular tooth-groove structure interrupts the inner annular surface 2 of the optical element, thereby reducing its reflection area and effectively reducing the spot intensity of stray light.

[0138] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical element, the optical element is ring-shaped, characterized in that: include: An outer annular surface (1) away from the optical axis; An inner annular surface (2) close to the optical axis, the inner annular surface (2) being an inclined surface, the inner annular surface (2) being provided with a plurality of matting structures (5) arranged at intervals, any of the matting structures (5) being composed of a plurality of tooth grooves, and the tooth groove cross-sectional shapes of the matting structures (5) on the inner annular surface (2) comprising one or more; An object side surface (3) and an image side surface (4) connecting the outer annular surface (1) and the inner annular surface (2); The matte structures (5) on the inner annular surface (2) are arranged at irregular intervals or at even intervals; The cross-sectional shape of the tooth grooves of the matting structure (5) includes one or more of irregular triangular tooth grooves, irregular trapezoidal tooth grooves, irregular arc-shaped tooth grooves, and irregular rectangular tooth grooves; The light reflectivity of the optical element is less than or equal to 10%; Any arc with an angle of 45° on the inner annular surface (2) contains at least 5 tooth grooves.

2. The optical element according to claim 1, characterized in that The inner annular surface (2) is in a step shape, comprising a plurality of step portions and a connecting portion between two of the step portions, and the matte structure (5) is arranged at one of the connecting portions.

3. The optical element according to claim 1, characterized in that The shortest distance D1 from the object side surface (3) to the optical axis and the shortest distance D2 from the image side surface (4) to the optical axis satisfy the following relationship: 0.5 <D1 / D2<0.99。 4. The optical element according to claim 1, characterized in that The shortest distance D3 from one end of the extinction structure close to the object side surface (3) to the optical axis and the shortest distance D4 from one end of the extinction structure close to the image side surface (4) to the optical axis satisfy the following relationship: 0<(D4-D3) / D3<0.

3.

5. The optical element according to claim 4, characterized in that The cross-sectional shape of the tooth groove of the matte structure (5) is a triangle or a trapezoid, and the angle a between the oblique sides of two adjacent tooth grooves satisfies the following relationship: 50°<a<70°.

6. The optical element according to claim 2, characterized in that The maximum width d of the optical element in a direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface (2) satisfy the following relationship: 0.4<f / d<0.

7.

7. The optical element according to claim 2, characterized in that The maximum width d and the minimum width e of the optical element in the direction perpendicular to the optical axis and the radial width f of the stepped inner annular surface (2) satisfy the following relationship: 0.7<(e+f) / d<0.

9.

8. An optical element assembly, characterized in that: include: At least two optical elements according to any one of claims 1 to 7 are arranged closely together in the same direction.

9. The optical element assembly according to claim 8, characterized in that: Two adjacent optical elements are arranged with a staggered position on the same optical axis.

10. An optical lens, characterized in that: include: Lens tube; A plurality of lenses are arranged in intervals in the lens barrel; A plurality of optical elements according to any one of claims 1 to 7 and / or an optical element assembly according to any one of claims 8 to 9.

11. The optical lens according to claim 10, characterized in that: The effective radius DT of the image side surface of the lens closest to the object side surface (3) of the optical element and the shortest distance D1 from the optical element to the optical axis satisfy the following relationship: 0.8<DT / D1<1.

12. The optical lens according to claim 10, characterized in that: The maximum light emission angle b of the lens image side closest to the object side (3) of the optical element and the angle c between the inner annular surface (2) where the optical element is located and the optical axis satisfy the following relationship: 1<b / c<3.

13. The optical lens according to claim 10, characterized in that: The number S of the optical elements included in the optical lens satisfies the following relationship: 1≤S≤5.

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