High-resolution visible light ultra-mirror lens, camera module and electronic device
By using hybrid technology combining metasurface lenses and traditional resin lenses, the problem of high-quality imaging in a limited space for the front-facing camera module was solved, achieving a high-resolution, miniaturized, and low-cost optical design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-14
- Publication Date
- 2026-06-16
AI Technical Summary
Existing front-facing camera modules struggle to achieve high-quality imaging within limited space, while traditional lenses suffer from issues such as large size and limited functionality.
By employing a hybrid refractive-superconducting technology, combining three traditional resin lenses and one metasurface lens, a high-resolution visible light refractive-superconducting lens is designed. The light waves are controlled through the micro-nano structure of the metasurface lens to achieve high-performance imaging. Furthermore, achromatic and thermal designs are achieved through material selection and optical power matching.
It achieves miniaturization and weight reduction while improving imaging resolution and quality, reducing the size and weight of the optical system, and lowering manufacturing costs.
Smart Images
Figure CN122218919A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of optical lenses, and specifically relates to a high-resolution visible light super-lens, a camera module, and an electronic device. Background Technology
[0002] Optical lenses are key components in modern optical systems, playing an irreplaceable role in information acquisition, image quality improvement, and system integration. As the core component of an optical imaging system, the optical lens focuses light from external objects onto a photosensitive element, enabling image formation and information acquisition. Whether in mobile phone cameras, digital cameras, or surveillance cameras, the optical lens is crucial for acquiring image information. Optical lenses can be integrated with other optical and electronic components to form complete optical systems. For example, in laser processing equipment, optical lenses work in conjunction with lasers, mirrors, and other components to achieve high-precision laser processing.
[0003] With the continuous advancement of technology, portable devices such as mobile phones and computers have become an indispensable part of users' daily lives, and their rich and powerful functions constantly meet users' needs. The camera modules of these portable devices, especially the front-facing camera modules, not only meet users' basic needs for video calls and selfies, but also play an important role in fields such as AR / VR and biometrics. A camera module mainly consists of an image sensor and an optical imaging lens. Modern camera modules typically use CMOS sensors due to their advantages such as low power consumption, high readout speed, and cost-effectiveness. The pixel size and light sensitivity of the sensor are key factors affecting image quality; performance in low-light environments can be improved through technical means (such as pixel binning). The optical imaging lens is the core component of the camera module, responsible for focusing light and guiding it to the image sensor. Lenses are usually composed of multiple lenses to reduce aberrations and improve image quality. The design of front-facing camera modules needs to achieve high-quality imaging within a limited space, meeting the requirements of miniaturization and ultra-thinness; there is still room for improvement in the size of traditional front-facing camera modules. Summary of the Invention
[0004] This application provides a high-resolution visible light superconducting lens, a camera module, and an electronic device to at least solve the above-mentioned technical problems existing in the prior art.
[0005] The first aspect of this application provides a high-resolution visible light super-lens, a camera module, and an electronic device, including a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object plane to the image plane; the first, third, and fourth lenses are all aspherical lenses; and the second lens is a metasurface lens. The lens satisfies: ; in, This refers to the optical distortion magnitude of a visible light hyperrefractive lens. Focal length The center thickness of the third lens. This is the effective aperture of the fourth lens.
[0006] In one embodiment, the substrate of the metasurface lens is glass with a thickness of 0.1-0.3 mm.
[0007] In one embodiment, the first lens is an aspherical lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the first lens are aspherical. The second lens is a metasurface lens, its object-side surface is planar, and its image-side surface has microstructures arranged. The third lens is an aspherical lens with positive optical power, its object-side surface is concave, and its image-side surface is convex; both the object-side and image-side surfaces of the third lens are aspherical. The fourth lens is an aspherical lens with negative optical power, its object-side and image-side surfaces are concave in the paraxial region; both the object-side and image-side surfaces of the fourth lens are aspherical.
[0008] In one embodiment, the first lens, the third lens, and the fourth lens are made of resin.
[0009] In one possible implementation, the overall effective aperture W of the lens satisfies: .
[0010] In one possible implementation, the lens field of view (FOV) satisfies: .
[0011] In one embodiment, the operating temperature of the lens is -30°C to 70°C.
[0012] In one possible implementation, an aperture is also included.
[0013] In one possible implementation, the distance from the center of the optical axis on the side of the aperture to the image plane is equal to the total optical length TTL, satisfying the following: .
[0014] A second aspect of this application provides a camera module, including an image sensor and any of the above-described visible light hyperrefractive lenses, wherein the image sensor is located on the image side of the visible light hyperrefractive lens.
[0015] A third aspect of this application provides an electronic device, including an image sensor and a camera module as described above; wherein the image sensor is communicatively connected to the camera module, and the image sensor is used to acquire image data from the camera module and process the image data.
[0016] Compared with the prior art, this application has the following advantages: 1. The lens of this application adopts a hybrid refractive and superconducting technology, consisting of three traditional resin lenses and one superconducting lens, to achieve high-resolution imaging over a wide band of visible light. 2. The lens of this application utilizes a hybrid refractive and superconducting technology to compress the overall optical length, achieving a miniaturized and lightweight design; 3. The manufacturing process of metasurfaces is relatively simple, and conventional methods such as photolithography, etching, sputtering, and spraying can be used to reduce the overall cost. Attached Figure Description
[0017] Figure 1 These are schematic diagrams of the visible light superconducting lenses in embodiments 1 and 2 of this application; Figure 2 This is a schematic diagram of the MTF of the visible light hyperrefractive lens in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the blur pattern of the visible light super-lens in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the MTF of the visible light hyperrefractive lens in Embodiment 2 of this application; Figure 5 This is a schematic diagram of the blur pattern of the visible light super-lens in Embodiment 2 of this application; Explanation of reference numerals in the attached figures: 110. Aperture stop; 120. First lens; 130. Second lens; 140. Third lens; 150. Fourth lens; 160. Imaging plane. Detailed Implementation
[0018] The present invention will now be described in further detail with reference to the accompanying drawings.
[0019] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0020] Metasurfaces are two-dimensional arrays of nanostructures capable of controlling the phase, amplitude, and polarization of light waves with subwavelength precision. Metasurface technology is an important branch of nanophotonics and metamaterials, its development stemming from the need to overcome the limitations of traditional optical elements (such as large size and limited functionality). Metasurfaces can achieve the functions of traditional optical elements at the subwavelength scale, significantly reducing the size and weight of optical systems. They can replace traditional thick lenses, enabling ultrathin and lightweight optical designs. Metasurfaces can achieve high performance levels that are difficult to achieve with traditional optical elements, such as high numerical aperture (NA), high resolution, and low aberrations. The fabrication of metasurfaces can be realized using existing semiconductor processing technologies, offering high cost-effectiveness.
[0021] Hybrid systems combining metasurface lenses and traditional lenses can effectively solve the problems existing in traditional lenses. Hybrid systems can typically achieve higher focal lengths and optical path folding, thereby achieving the required optical path length within a relatively small optical system. This helps reduce the size and weight of the optical system, making it easier to integrate into devices, while still achieving a high level of imaging resolution, and at a lower manufacturing cost.
[0022] In this embodiment, the metasurface lens consists of a substrate and micro / nanostructures disposed on the substrate. These micro / nanostructures are composed of subwavelength-scale micro / nano unit arrays, each with a specific shape, size, and arrangement to achieve precise control over the phase, amplitude, or polarization state of the incident light wave. Through the design of these micro / nanostructures, the metasurface lens can achieve optical performance comparable to or even superior to traditional lenses while maintaining a slim and lightweight design, such as high transmittance, low chromatic aberration, and low distortion. The period of the micro / nanostructures in the metasurface lens ranges from 250 to 400 nm, with an optimal period of 350 nm in this embodiment; the height of the micro / nanostructures ranges from 600 to 1300 nm, with an optimal height of 1000 nm in this embodiment; the diameter of the micro / nanostructures covers 100 to 250 nm, and the material is silicon dioxide, arranged in square, hexagonal, and other shapes.
[0023] Specifically, this application discloses a high-resolution visible light super-lens, comprising a first lens 120, a second lens 130, a third lens 140, and a fourth lens 150 arranged sequentially along the optical axis from the object plane to the image plane. At least one of the first lens 120, second lens 130, third lens 140, and fourth lens 150 is a metasurface lens. Metasurface lenses have chromatic aberration-correcting capabilities; by setting at least one lens in the visible light super-lens to be a metasurface lens, chromatic aberration can be effectively corrected, thereby improving the image quality of the visible light super-lens.
[0024] In one embodiment, the second lens 130 is a metasurface lens made of glass with a thickness of 0.1-0.3 mm. Its object side is flat, and its image side has a microstructure arrangement. The first lens 120, the third lens 140, and the fourth lens 150 are made of resin.
[0025] By using resin for the first lens 120, third lens 140, and fourth lens 150, and glass for the second lens 130, the high-resolution visible light super-refractive lens possesses chromatic aberration capability, thus ensuring consistent image quality within a certain range. Furthermore, the coordination of materials and the optical power of each lens element achieves a heat-free design, reducing material costs and system size.
[0026] refer to Figure 1 The visible light hyperspectral lens provided in this embodiment of the invention also includes an aperture stop 110, which is located in front of the first lens 120.
[0027] Specifically, Figure 1 This is a schematic diagram of the visible light superconducting lens under normal temperature conditions, provided by an embodiment of the present invention. Figure 1 As shown, the visible light hyperrefractive lens provided in this embodiment of the invention includes an aperture stop 110, a first lens 120, a second lens 130, a third lens 140, and a fourth lens 150 arranged sequentially along the optical axis from the object plane to the image plane. The first lens 120 is an aspherical lens with positive optical power, its object-side surface is convex, and its image-side surface is concave. Both the object-side and image-side surfaces of the first lens are aspherical. Simultaneously, a visible light lens is provided to satisfy… This shortens the overall optical length of the visible light refractive lens. The lens size is relatively small, and the overall effective lens diameter meets the requirements. Furthermore, the overall field of view of the visible light super-refractive lens is also relatively large. ,in, This refers to the optical distortion magnitude of a visible light hyperrefractive lens. Focal length The center thickness of the third lens. This is the effective aperture of the fourth lens.
[0028] like Figure 1 As shown, the incident light passes through the aperture 110, enters from the object side of the first lens 120, passes through the second lens 130, and then passes through the third lens 140 and the fourth lens 150, finally converging on the imaging surface 160. Example
[0029] Figure 1 A schematic diagram of the structure of a high-resolution visible light superlens in a room temperature state, provided as an embodiment of the present invention, is shown below. Figure 1As shown, the visible light hyperspectral lens provided in this embodiment of the invention includes an aperture stop 110, a first lens 120, a second lens 130, a third lens 140, and a fourth lens 150 arranged sequentially along the optical axis from the object plane to the image plane.
[0030] Specifically, the first lens 120 is an aspherical lens with positive optical power, its object side is convex, and its image side is concave; the second lens 130 is a metasurface lens, its object side is flat, and its image side has microstructures arranged; the third lens 140 is an aspherical lens with positive optical power, its object side is concave, its image side is convex, and both its object side and image side are aspherical; the fourth lens 150 is an aspherical lens with negative optical power, and in the paraxial region, both its object side and image side are concave; the aperture stop 110 is located in front of the first lens 120.
[0031] For example, Table 1 details the specific optical data parameters of each lens in the visible light hyperrefractive lens provided in the embodiments of the present invention, according to a feasible implementation. The optical data parameters in Table 1 correspond to... Figure 1 The visible light hyperrefractive lens shown.
[0032] Table 1
[0033] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number 1 represents aperture 110, surface number 2 represents the object side of the first lens 120, surface number 3 represents the image side of the first lens 120, and so on. The radius of curvature represents the degree of curvature of the lens surface. A positive value means that the surface is curved toward the image plane, and a negative value means that the surface is curved toward the object plane. "Infinity" indicates that the surface is flat. The spacing represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the spacing are millimeters (mm).
[0034] Its even-order aspherical surface shape satisfies the following equation: Where z is the distance from the vertex of the even-order aspherical surface along the optical axis, r is the height from the optical axis, c is the curvature 1 / R, R is the radius of curvature at the vertex of the lens, k is the conic coefficient -e2, and a2, a3, a4, a5, a6, a7, and a8 are the higher-order coefficients of the aspherical surface.
[0035] For example, Table 2 details the conic coefficient k and higher-order coefficients a2, a3, a4, a5, a6, a7, a8 of the aspherical lens surface in this embodiment according to a feasible implementation.
[0036] Table 2
[0037] Here, 4.15E+003 indicates that the coefficient a2 of face number 2 is 4.15E+003, and so on.
[0038] For example, Table 3 details the phase of the metasurface in this embodiment with a feasible implementation method.
[0039] Table 3
[0040] Where R1 is the normalized radius of the binary surface.
[0041] In this embodiment, the optical distortion, focal length, center thickness of the third lens, and effective aperture of the fourth lens satisfy the following conditions: The total length of the optical lens meets the TTL requirement. ; The visible light hyperrefractive lens provided in this embodiment operates in the 435-650nm wavelength range, and its overall effective aperture meets the requirements. The maximum field of view is 97.1°, which meets the requirements of the front camera module.
[0042] Figure 2 This is a schematic diagram of the MTF of a visible light super-lens provided in an embodiment of the present invention. The visible light super-lens provided in this embodiment of the present invention has high resolution. All fields of view ,exist Central field of view It can meet the high-quality imaging requirements of the front-facing camera lens.
[0043] Figure 3 This is a schematic diagram of the diffusion pattern of the visible light super-lens provided in an embodiment of the present invention. The visible light super-lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed diffusion pattern throughout the long wavelength band, which can meet the requirements of high-resolution imaging. Example
[0045] Figure 1 A schematic diagram of the structure of a high-resolution visible light superlens in a room temperature state, provided as an embodiment of the present invention, is shown below. Figure 1 As shown, the visible light hyperspectral lens provided in this embodiment of the invention includes an aperture stop 110, a first lens 120, a second lens 130, a third lens 140, and a fourth lens 150 arranged sequentially along the optical axis from the object plane to the image plane.
[0046] Specifically, the first lens 120 is an aspherical lens with positive optical power, its object side is convex, and its image side is concave; the second lens 130 is a metasurface lens, its object side is flat, and its image side has microstructures arranged; the third lens 140 is an aspherical lens with positive optical power, its object side is concave, its image side is convex, and both its object side and image side are aspherical; the fourth lens 150 is an aspherical lens with negative optical power, and in the paraxial region, both its object side and image side are concave; the aperture stop 110 is located in front of the first lens 120.
[0047] For example, Table 4 details the specific optical data parameters of each lens in the visible light hyperrefractive lens provided in the embodiments of the present invention, according to a feasible implementation. The optical data parameters in Table 4 correspond to... Figure 1 The visible light hyperrefractive lens shown.
[0048] Table 4
[0049] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number 1 represents aperture 110, surface number 2 represents the object side of the first lens 120, surface number 3 represents the image side of the first lens 120, and so on. The radius of curvature represents the degree of curvature of the lens surface. A positive value means that the surface is curved toward the image plane, and a negative value means that the surface is curved toward the object plane. "Infinity" indicates that the surface is flat. The spacing represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the spacing are millimeters (mm).
[0050] Its even-order aspherical surface shape satisfies the following equation: Where z is the distance from the vertex of the even-order aspherical surface along the optical axis, r is the height from the optical axis, c is the curvature 1 / R, R is the radius of curvature at the vertex of the lens, k is the conic coefficient -e2, and a2, a3, a4, a5, a6, a7, and a8 are the higher-order coefficients of the aspherical surface.
[0051] For example, Table 5 details the conic coefficient k and higher-order coefficients a2, a3, a4, a5, a6, a7, a8 of the aspherical lens surface in this embodiment according to a feasible implementation.
[0052] Table 5
[0053] Here, 5.02E+003 indicates that the coefficient a2 of face number 2 is 5.02E+003, and so on.
[0054] For example, Table 6 details the phase of the metasurface in this embodiment with a feasible implementation.
[0055] Table 6
[0056] Where R1 is the normalized radius of the binary surface.
[0057] In this embodiment, the optical distortion, focal length, center thickness of the third lens, and effective aperture of the fourth lens satisfy the following conditions: The total length of the optical lens meets the TTL requirement. ; The visible light hyperrefractive lens provided in this embodiment operates in the 435-650nm wavelength range, and its overall effective aperture meets the requirements. The maximum field of view is 95.0°, which meets the requirements of the front camera module.
[0058] Figure 4 This is a schematic diagram of the MTF of a visible light super-lens provided in an embodiment of the present invention. The visible light super-lens provided in this embodiment of the present invention has high resolution. All fields of view ,exist Central field of view It can meet the high-quality imaging requirements of the front-facing camera lens.
[0059] Figure 5 This is a schematic diagram of the diffusion pattern of the visible light super-lens provided in an embodiment of the present invention. The visible light super-lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed diffusion pattern throughout the long wavelength band, which can meet the requirements of high-resolution imaging.
[0060] In summary, the visible light superconducting lens provided in this embodiment of the invention has a large field of view, uniform brightness throughout the entire field of view, clear imaging, and a small TTL, which can meet the requirements of high-resolution imaging and lightweight integration.
[0061] Example 1 and Example 2 respectively satisfy the relationships shown in Table 7 below: Table 7
[0062] This application also discloses a camera module, including an image sensor and any of the above-mentioned visible light hyperspectral lenses, wherein the image sensor is located on the image side of the visible light hyperspectral lens.
[0063] This application also discloses an electronic device, including an image sensor and a camera module as described above; wherein the image sensor is communicatively connected to the camera module, and the image sensor is used to acquire image data from the camera module and process the image data.
[0064] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A high-resolution visible light superlens, characterized in that, It includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical axis from the object plane to the image plane; wherein the first, third, and fourth lenses are all aspherical lenses; and the second lens is a metasurface lens; The lens satisfies: ； in, This refers to the optical distortion magnitude of a visible light hyperrefractive lens. Focal length The center thickness of the third lens. This is the effective aperture of the fourth lens.
2. The visible light hyperrefractive lens according to claim 1, characterized in that: The substrate of the metasurface lens is glass with a thickness of 0.1-0.3 mm.
3. The visible light hyperrefractive lens according to claim 1, characterized in that: The first lens is an aspherical lens with positive optical power, its object side is convex and its image side is concave; both the object side and the image side of the first lens are aspherical. The second lens is a metasurface lens, with a flat object side and a microstructure arrangement on the image side; The third lens is an aspherical lens with positive optical power, its object side is concave and its image side is convex; both the object side and the image side of the third lens are aspherical. The fourth lens is an aspherical lens with negative optical power, and its object-side and image-side surfaces are both concave in the paraxial region; the object-side and image-side surfaces of the fourth lens are both aspherical.
4. The visible light hyperrefractive lens according to claim 1, characterized in that: The first lens, the third lens, and the fourth lens are made of resin.
5. The visible light hyperrefractive lens according to claim 1, characterized in that, The overall effective aperture W of the lens satisfies: .
6. The visible light hyperrefractive lens according to claim 1, characterized in that, The lens field of view (FOV) satisfies: .
7. The visible light hyperrefractive lens according to claim 1, characterized in that: The operating temperature of the lens is -30℃ to 70℃.
8. The visible light hyperrefractive lens according to claim 1, characterized in that: It also includes the aperture.
9. The visible light hyperrefractive lens according to claim 8, characterized in that, The distance from the center of the optical axis on the object side of the aperture to the image plane is equal to the total optical length TTL, satisfying the following: .
10. A camera module, characterized in that: It includes an image sensor and any one of the visible light superconducting lenses of claims 1-9, wherein the image sensor is located on the image side of the visible light superconducting lens.
11. An electronic device, characterized in that: It includes an image sensor and a camera module as described in claim 10; wherein the image sensor is communicatively connected to the camera module, and the image sensor is used to acquire image data from the camera module and process the image data.