Imaging lens
By designing an imaging lens composed of three optical components, using curved imprinted structure and urgency film, the complex structure of the existing imaging lens is solved, high-definition imaging with large field of view and cost reduction, and waterproof and resistance High temperature capability.
Patent Information
- Application Number
- CN202420435715.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-06
AI Technical Summary
The existing imaging lens has complex structures, resulting in high costs, increased manufacturing difficulty and small field angles, making it difficult to ensure imaging quality while simplifying the structural composition and reducing costs.
An imaging lens consisting of three optical elements, each of which consists of a substrate and an imprinted structure. The imprinted structure is curved, combined with an amplicon film and an infrared cutoff film to achieve light introduction, refraction and imaging, correct aberration and chromatic aberration , satisfying high-definition imaging with large field of view.
Simplifies the structural composition of the imaging lens, reduces costs, and achieves high-definition imaging with a maximum field of view angle of 130° to 160°, avoids the need to increase aspherical surfaces and glass substrates, has scratch-proof, dust-proof and waterproof functions, and Reduces the cost of traditional lenses.
Smart Images
Figure CN222189562U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical imaging equipment, in particular to an imaging lens. Background Art
[0002] Wafer-level imaging lenses based on nanoimprint technology have gradually become a very promising imaging recognition solution in popular fields such as VR recognition, pan / tilt tracking, and medical endoscopy due to their advantages such as small size, square appearance, and large number of one-time manufacturing. However, the field of view of wafer-level imaging lenses is generally small. Improving the shooting field of view and clarity often requires the use of more glass substrates and aspherical surfaces. The addition of new glass substrates and aspherical surfaces will cause the lens to become longer, while increasing the overall cost and manufacturing difficulty. Therefore, how to ensure imaging quality while simplifying the structural composition of the imaging lens and reducing costs has become a design difficulty.
[0003] That is to say, the imaging lens in the prior art has the problem of complex structure. Utility Model Content
[0004] The main purpose of the utility model is to provide an imaging lens to solve the problem of complicated structure of the imaging lens in the prior art.
[0005] In order to achieve the above-mentioned purpose, the utility model provides an imaging lens, which includes a first element, a second element and a third element in sequence from the first side to the second side, the first element is composed of a first substrate and a first imprinted structure connected to each other, and the first imprinted structure is located on the second side of the first substrate, the second element is composed of a second substrate and a second imprinted structure connected to each other, and the second imprinted structure is located on the second side of the second substrate, and the third element is composed of a third substrate and a third imprinted structure connected to each other, and the third imprinted structure is located on the second side of the third substrate; a side surface of the first imprinted structure away from the first substrate, a side surface of the second imprinted structure away from the second substrate, and a side surface of the third imprinted structure away from the third substrate are all curved surfaces.
[0006] Further, a side surface of the first substrate away from the first imprinting structure, a side surface of the second substrate away from the second imprinting structure, and a side surface of the third substrate away from the second imprinting structure are all planes.
[0007] Furthermore, the first substrate is a flat glass substrate, and the first imprinted structure is a glue structure; the second substrate is a flat glass substrate, and the second imprinted structure is a glue structure; the third substrate is a flat glass substrate, and the third imprinted structure is a glue structure.
[0008] Furthermore, the refractive index of the second substrate is greater than or equal to 1.5 and less than or equal to 2.0; and / or the Abbe number of the second substrate is greater than or equal to 17 and less than or equal to 35.
[0009] Further, a surface of the first embossed structure away from the first substrate is a concave surface, a surface of the second embossed structure away from the second substrate is a convex surface, and a surface of the third embossed structure away from the third substrate is a convex surface.
[0010] Furthermore, the imaging lens also includes a plurality of anti-reflection films and at least one infrared cut-off film, and the anti-reflection films are arranged on the first side and the second side of the first element, the second side of the second element, and the first side and the second side of the third element; and / or the infrared cut-off film is arranged on the first side of the second element.
[0011] Furthermore, the maximum field of view angle of the imaging lens is greater than or equal to 130° and less than or equal to 160°.
[0012] Further, the refractive indexes of the first element, the second element and the third element are all within a range of greater than 1 and less than 5.
[0013] Furthermore, a surface of the first imprinted structure on a side away from the first substrate is one of a spherical surface, an aspherical surface and a free-form surface, a surface of the second imprinted structure on a side away from the second substrate is one of a spherical surface, an aspherical surface and a free-form surface, and a surface of the third imprinted structure on a side away from the third substrate is one of a spherical surface, an aspherical surface and a free-form surface.
[0014] Furthermore, the projection area of the first imprinted structure on the second side surface of the first substrate is smaller than the area of the second side surface of the first substrate, and the projection area of the second imprinted structure on the second side surface of the second substrate is smaller than the area of the second side surface of the second substrate; the bonding surface between the second substrate and the second imprinted structure is an aperture surface.
[0015] By applying the technical solution of the utility model, the imaging lens includes a first element, a second element and a third element in sequence from the first side to the second side, the first element is composed of a first substrate and a first imprinted structure connected to each other, and the first imprinted structure is located on the second side of the first substrate, the second element is composed of a second substrate and a second imprinted structure connected to each other, and the second imprinted structure is located on the second side of the second substrate, and the third element is composed of a third substrate and a third imprinted structure connected to each other, and the third imprinted structure is located on the second side of the third substrate; a side surface of the first imprinted structure away from the first substrate, a side surface of the second imprinted structure away from the second substrate, and a side surface of the third imprinted structure away from the third substrate are all curved surfaces.
[0016] The imaging lens of the present application adopts three optical elements, namely, the first element, the second element and the third element, and the number of elements is relatively small, which is conducive to simplifying the structural composition of the imaging lens. At the same time, the first element is composed of a first substrate and a first imprinted structure connected to each other, the second element is composed of a second substrate and a second imprinted structure connected to each other, and the third element is composed of a third substrate and a third imprinted structure connected to each other, so that each element is connected by two parts, further compressing the optical assembly of the imaging lens, ensuring miniaturization, and meeting the size requirements of the wafer-level lens. Further constraining the side surface of the first imprinted structure away from the first substrate, the side surface of the second imprinted structure away from the second substrate, and the side surface of the third imprinted structure away from the third substrate are all curved surfaces, so that the first element, the second element and the third element can realize the introduction, refraction and imaging of light, so that light beams of different field angles are transmitted and refracted in each element, correcting aberrations and chromatic aberrations, and finally achieving high-definition imaging. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] 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:
[0018] Figure 1 A schematic structural diagram of an imaging lens according to an optional embodiment of the utility model is shown;
[0019] Figure 2 Shows Figure 1 Another structural schematic diagram of the imaging lens in FIG.
[0020] Figure 3 Shows Figure 1 Light path diagram of the imaging lens in ;
[0021] Figure 4 Shows Figure 1 A schematic diagram of the structure of the first element in FIG.
[0022] Figure 5 Shows Figure 1 A schematic diagram of the structure of the second element in FIG.
[0023] Figure 6 Shows Figure 1 A schematic diagram of the structure of the third element in FIG.
[0024] Figure 7 The MTF curve diagram of an imaging lens of an optional embodiment of the utility model is shown;
[0025] Figure 8 A field curvature diagram of an imaging lens of an optional embodiment of the utility model is shown;
[0026] Fig. 9 A distortion diagram of an imaging lens of an optional embodiment of the utility model is shown;
[0027] Fig.10 A spot diagram of an imaging lens according to an optional embodiment of the utility model is shown.
[0028] The above drawings include the following reference numerals:
[0029] 10. First element; 11. First substrate; 12. First embossed structure; 13. First bonding surface; 20. Second element; 21. Second substrate; 22. Second embossed structure; 23. Second bonding surface; 30. Third element; 31. Third substrate; 32. Third embossed structure; 33. Third bonding surface; 40. Photosensitive element. DETAILED DESCRIPTION
[0030] 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.
[0031] 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.
[0032] 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.
[0033] In order to solve the problem of complicated structure of imaging lenses in the prior art, the utility model provides an imaging lens.
[0034] like Figures 1 to 10 As shown, the imaging lens includes a first element 10, a second element 20 and a third element 30 from the first side to the second side, the first element 10 is composed of a first substrate 11 and a first imprinted structure 12 connected to each other, and the first imprinted structure 12 is located on the second side of the first substrate 11, the second element 20 is composed of a second substrate 21 and a second imprinted structure 22 connected to each other, and the second imprinted structure 22 is located on the second side of the second substrate 21, and the third element 30 is composed of a third substrate 31 and a third imprinted structure 32 connected to each other, and the third imprinted structure 32 is located on the second side of the third substrate 31; a side surface of the first imprinted structure 12 away from the first substrate 11, a side surface of the second imprinted structure 22 away from the second substrate 21, and a side surface of the third imprinted structure 32 away from the third substrate 31 are all curved surfaces.
[0035] The imaging lens of the present application adopts three optical elements of the first element 10, the second element 20 and the third element 30, and the number of elements is small, which is conducive to simplifying the structural composition of the imaging lens. At the same time, the first element 10 is composed of the first substrate 11 and the first imprinted structure 12 connected to each other, the second element 20 is composed of the second substrate 21 and the second imprinted structure 22 connected to each other, and the third element 30 is composed of the third substrate 31 and the third imprinted structure 32 connected to each other, so that each element is connected by two parts, further compressing the optical assembly of the imaging lens, ensuring miniaturization, and meeting the size requirements of the wafer-level lens. Further constraining the side surface of the first imprinted structure 12 away from the first substrate 11, the side surface of the second imprinted structure 22 away from the second substrate 21, and the side surface of the third imprinted structure 32 away from the third substrate 31 are all curved surfaces, so that the first element 10, the second element 20 and the third element 30 can realize the introduction, refraction and imaging of light, so that light beams of different field angles are transmitted and refracted in each element, correcting aberrations and chromatic aberrations, and finally achieving high-definition imaging.
[0036] It should be noted that the imaging lens of the present application is a wafer-level imaging lens, and has the characteristics of wide angle and small size. Specifically, the maximum field of view angle of the imaging lens is greater than or equal to 130° and less than or equal to 160°.
[0037] It should also be noted that the first side of the imaging lens is the light incident side, and the second side of the imaging lens is the light exiting side. The imaging lens further includes a photosensitive element 40 located on the second side of the third element 30. Light incident from the light incident side passes through the first element 10, the second element 20, and the third element 30 in sequence and is imaged on the photosensitive element 40. Both side surfaces of the first element 10, the second side surfaces of the second element 20, and the third side surfaces of the third element 30 are all transmission surfaces.
[0038] Specifically, the side surface of the first substrate 11 away from the first imprinting structure 12, the side surface of the second substrate 21 away from the second imprinting structure 22, and the side surface of the third substrate 31 away from the second imprinting structure 22 are all planes. This arrangement is conducive to the refraction of light.
[0039] like Figure 4As shown, the first substrate 11 is a flat glass substrate, the first embossed structure 12 is a glue structure, the center thickness of the first substrate 11 is greater than the center thickness of the first embossed structure 12, and the surface of the first embossed structure 12 on one side away from the first substrate 11 is a concave surface. The first substrate 11 can serve as a protective element and a waterproof element for the imaging lens. The surface of the first embossed structure 12 on one side away from the first substrate 11 is a concave refractive surface and is a low-dispersion glue material, which realizes smooth emission and chromatic aberration correction of large-angle light. When the surface of the first embossed structure 12 on one side away from the first substrate 11 is an aspherical surface, the aberration can be better corrected to improve the imaging quality.
[0040] like Figure 5 As shown, the second substrate 21 is a flat glass substrate, the second embossed structure 22 is a glue structure, the center thickness of the second substrate 21 is greater than the center thickness of the second embossed structure 22, and the surface of the second embossed structure 22 away from the second substrate 21 is a convex surface. Among them, an infrared cut-off film is plated on the first side surface of the second substrate 21, and an anti-reflection film is plated on the image side surface of the second embossed structure 22. The bonding surface between the second substrate 21 and the second embossed structure 22 is an aperture surface. Specifically, the aperture surface is formed by making a black glue layer with optical through holes on the bonding surface. An infrared cut-off film is plated on the first side surface of the second substrate 21 to prevent infrared light from interfering with visible light imaging. The aperture formed by the black glue layer is used to block non-imaging light to improve imaging quality. When the surface of the second embossed structure 22 away from the second substrate 21 is an aspherical surface, aberrations can be better corrected to improve imaging quality.
[0041] Preferably, the refractive index of the second substrate 21 is greater than or equal to 1.5 and less than or equal to 2.0, and the Abbe number of the second substrate 21 is greater than or equal to 17 and less than or equal to 35, so that the second substrate 21 is a high-dispersion substrate, specifically a high-dispersion optical glass. Since the position of the second substrate 21 is the reverse divergence path of the light, the dispersion of the second substrate 21 has a strong influence on the incident light with a large field of view angle. The use of high-dispersion optical glass can very well correct the chromatic aberration of the optical system, so as to achieve a high-definition imaging effect with a wide angle using fewer aspherical surfaces.
[0042] like Figure 6 As shown, the third substrate 31 is a flat glass substrate, the third embossed structure 32 is a glue structure, and the center thickness of the third substrate 31 is relatively close to the center thickness of the third embossed structure 32. The surface of the third embossed structure 32 on one side away from the third substrate 31 is a convex surface. The third element 30 is an emission convergence element for light rays at each field angle of view of the imaging lens. When the convex emission surface is an aspherical surface, the aberration can be better corrected to improve the imaging quality. Optionally, the first side surface of the third element 30 can be made into a diffraction binary surface, which is a phase-modulated diffraction surface. The diffraction binary surface can further reduce the size of the imaging lens and greatly improve the optical imaging effect.
[0043] Specifically, the imaging lens also includes multiple anti-reflection films and at least one infrared cut-off film. The first side and second side of the first element 10, the second side of the second element 20, and the first side and second side of the third element 30 are all provided with anti-reflection films. By reasonably providing the anti-reflection films, the incident light can be fully utilized as much as possible. The infrared cut-off film is provided on the first side of the second element 20, so that the infrared light can be prevented from interfering with the visible light imaging.
[0044] Specifically, the refractive indexes of the first element 10, the second element 20 and the third element 30 are all within a range greater than 1 and less than 5. The total length of the element on the optical axis can be expressed as L, L=N*d, N is the refractive index, and d represents the geometric path. When the total optical path L is constant, the larger N is, the smaller d is. The refractive index of the element can reduce the geometric path on the optical axis, thereby reducing the length of the imaging lens. For the transmission surface, the glue realizes the convergence or divergence of the light beam according to the law of refraction through the refractive index and the curvature of the surface.
[0045] Specifically, the surface of the first imprinted structure 12 away from the first substrate 11 is one of a spherical surface, an aspherical surface and a free-form surface, the surface of the second imprinted structure 22 away from the second substrate 21 is one of a spherical surface, an aspherical surface and a free-form surface, and the surface of the third imprinted structure 32 away from the third substrate 31 is one of a spherical surface, an aspherical surface and a free-form surface. The first side surface of each substrate can be set as a diffraction binary surface, which can be set according to actual conditions. Preferably, the surface of the first imprinted structure 12 away from the first substrate 11, the surface of the second imprinted structure 22 away from the second substrate 21 and the surface of the third imprinted structure 32 away from the third substrate 31 are all aspherical surfaces.
[0046] When the first side of the substrate is a plane, as the light incident window of each element in the imaging lens, coating with anti-reflection film and infrared cut-off film is beneficial to improve the amount of light entering and the imaging quality. Directly coating the infrared cut-off film on the element of the imaging lens can also save a filter in manufacturing costs. When the first side of the substrate is a diffraction binary surface, since it can provide additional aberration correction and light refraction, it can greatly improve the imaging quality while further reducing the size of the lens. When the second side of each element is a spherical surface, it can achieve convergent imaging of light with a large field of view. When the second side of each element is a non-spherical surface, it can well eliminate the aberration caused by the optical system, ensure the imaging clarity of the imaging lens, and the imprinting process does not add any additional difficulty and cost compared to the spherical surface. When the second side of each element is a free-form surface, since the imaging chip is square, separate aberration correction can be performed in different dimensions to further improve the imaging quality or distortion.
[0047] In summary, the first substrate 11, the second substrate 21 and the third substrate 31 can be realized by a mechanical processing process. When the dielectric material of the mechanical processing method is glass, the specific surface shape of the substrate surface can be processed by cutting and other processes using a machine tool or other tool. Optionally, the first substrate 11, the second substrate 21 and the third substrate 31 can also be plastic substrates, which can be changed according to different usage scenarios. The plastic substrate can be formed by plastic injection molding, which is a method for manufacturing plastic products. The molten plastic is injected into the plastic product mold under pressure, and the desired various plastic parts are obtained by cooling and molding. The specific material is usually PC or PMMA.
[0048] like Figure 1 and Figure 2 As shown, the first element 10 further has a first bonding surface 13, and the connection surface between the first substrate 11 of the first element 10 and the first embossed structure 12 is the first bonding surface 13; the second element 20 further has a second bonding surface 23, and the connection surface between the second substrate 21 of the second element 20 and the second embossed structure 22 is the second bonding surface 23; the third element 30 further has a third bonding surface 33, and the connection surface between the third substrate 31 of the third element 30 and the third embossed structure 32 is the third bonding surface 33. The projection area of the first embossed structure 12 on the second side surface of the first substrate 11 is smaller than the area of the second side surface of the first substrate 11, and the projection area of the second embossed structure 22 on the second side surface of the second substrate 21 is smaller than the area of the second side surface of the second substrate 21.
[0049] In summary, the imaging lens of the present application can realize optical imaging of the imaging lens through the reasonable design and arrangement of each component, and can realize the anti-scratch, dustproof and waterproof functions of the imaging lens. By setting the second substrate 21 as high-dispersion glass, the optical lens can have a large field of view while satisfying the effect of clear imaging. By reasonably setting the infrared cut-off film, it is possible to filter infrared light without setting other filter elements to ensure the quality of visible light imaging. In addition, the imaging lens of the present application achieves high-definition imaging with a large field of view of 150° while meeting the requirements of using three aspherical surfaces, and eliminates the filter elements of traditional plastic lenses to reduce costs, while having high waterproof and high temperature resistance.
[0050] The imaging lens of the present application is described below in conjunction with specific embodiments and drawings.
[0051] like Figure 1 and Figure 2As shown, the imaging lens includes a first element 10, a second element 20, a third element 30 and a photosensitive element 40 from the first side to the second side. The first side surfaces of the first element 10, the second element 20 and the third element 30 are all planes, and the second side surfaces of the first element 10, the second element 20 and the third element 30 are all curved surfaces. The first element 10 is used to realize the divergence and turning of large-angle light on the object side, so that the large-angle light is incident on the optical entrance pupil at a gentler angle. The second element 20 is used to realize the screening and chromatic aberration correction of the actual effective imaging light. The third element 30 is used to realize the re-convergence of the outgoing light of each field of view angle for imaging.
[0052] like Figure 3 As shown in FIG. 1 , it is a light path diagram of imaging after light from different field of view angles is incident on the imaging lens. The incident light angle ranges from 0° to 75°, and the maximum field of view FOV of the imaging lens is 150°.
[0053] Figure 7 shows an on-axis MTF curve diagram of the imaging of the imaging lens in this embodiment; Figure 8 shows a field curvature diagram of the imaging lens in this embodiment; Fig. 9 shows an optical distortion diagram of the imaging lens in this embodiment; Fig.10 FIG. 1 shows a spot diagram of the imaging lens of this embodiment. Figures 7 to 10 It can be seen that the imaging lens of this embodiment can achieve good imaging quality.
[0054] 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.
[0055] 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.
[0056] 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.
[0057] 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. An imaging lens, characterized in that: The device comprises a first element (10), a second element (20) and a third element (30) in sequence from the first side to the second side. The first element (10) is composed of a first substrate (11) and a first embossed structure (12) connected to each other, the first embossed structure (12) being located on a second side of the first substrate (11); the second element (20) is composed of a second substrate (21) and a second embossed structure (22) connected to each other, the second embossed structure (22) being located on a second side of the second substrate (21); the third element (30) is composed of a third substrate (31) and a third embossed structure (32) connected to each other, the third embossed structure (32) being located on a second side of the third substrate (31); A side surface of the first embossed structure (12) away from the first substrate (11), a side surface of the second embossed structure (22) away from the second substrate (21), and a side surface of the third embossed structure (32) away from the third substrate (31) are all curved surfaces.
2. The imaging lens according to claim 1, wherein: A side surface of the first substrate (11) away from the first imprinting structure (12), a side surface of the second substrate (21) away from the second imprinting structure (22), and a side surface of the third substrate (31) away from the second imprinting structure (22) are all planes.
3. The imaging lens according to claim 1, wherein: The first substrate (11) is a flat glass substrate, and the first embossed structure (12) is a glue structure; the second substrate (21) is a flat glass substrate, and the second embossed structure (22) is a glue structure; the third substrate (31) is a flat glass substrate, and the third embossed structure (32) is a glue structure.
4. The imaging lens according to claim 1, wherein: The refractive index of the second substrate (21) is greater than or equal to 1.5 and less than or equal to 2.0; and / or the Abbe number of the second substrate (21) is greater than or equal to 17 and less than or equal to 35.
5. The imaging lens according to claim 1, wherein: The surface of the first embossed structure (12) on one side away from the first substrate (11) is a concave surface, the surface of the second embossed structure (22) on one side away from the second substrate (21) is a convex surface, and the surface of the third embossed structure (32) on one side away from the third substrate (31) is a convex surface.
6. The imaging lens according to any one of claims 1 to 5, characterized in that: The imaging lens further includes a plurality of anti-reflection films and at least one infrared cut-off film. The antireflection film is disposed on the first side surface and the second side surface of the first element (10), the second side surface of the second element (20) and the first side surface and the second side surface of the third element (30); and / or The infrared cut-off film is arranged on the first side of the second element (20).
7. The imaging lens according to any one of claims 1 to 5, characterized in that: The maximum field of view angle of the imaging lens is greater than or equal to 130° and less than or equal to 160°.
8. The imaging lens according to any one of claims 1 to 5, characterized in that: The refractive indexes of the first element (10), the second element (20) and the third element (30) are all within a range of greater than 1 and less than 5.
9. The imaging lens according to any one of claims 1 to 5, characterized in that: The surface of the first embossed structure (12) on the side away from the first substrate (11) is one of a spherical surface, an aspherical surface and a free-form surface; the surface of the second embossed structure (22) on the side away from the second substrate (21) is one of a spherical surface, an aspherical surface and a free-form surface; and the surface of the third embossed structure (32) on the side away from the third substrate (31) is one of a spherical surface, an aspherical surface and a free-form surface.
10. The imaging lens according to any one of claims 1 to 5, characterized in that: The projection area of the first embossed structure (12) on the second side surface of the first substrate (11) is smaller than the area of the second side surface of the first substrate (11), and the projection area of the second embossed structure (22) on the second side surface of the second substrate (21) is smaller than the area of the second side surface of the second substrate (21); The bonding surface between the second substrate (21) and the second embossed structure (22) is an aperture surface.