Folding and super hybrid lens, camera module and terminal equipment

Abstract

The invention discloses a refraction and super hybrid lens, a camera module and terminal equipment. The refraction and super hybrid lens comprises a plurality of lenses which are sequentially arranged from an object plane to an image plane along an optical axis; wherein at least one lens is a metasurface lens, and the other lenses are non-metasurface lenses. On the premise that the focal length and the F number are ensured, the number of lenses, the total TTL optical length, the overall size and the manufacturing cost are remarkably reduced, so that an optical system with a large view field and a low F value is constructed, the optical performance is improved, and miniaturization and lightweight design is achieved. Besides, achromatism is effectively realized by utilizing the negative dispersion characteristic of the metasurface lens, so that the high-resolution imaging effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of visible light photography, and particularly relates to a refractive and metasurface hybrid lens, an imaging module and a terminal device. Background Art

[0002] At present, the visible light mobile front imaging technology mainly relies on the visible light spectrum range of 380 - 750 nm to achieve the image acquisition function. This technology supports the high-definition image shooting and real-time video interaction capabilities of smart phones. Against the background of the wide popularization of intelligent terminal devices and the rapid development of the mobile Internet ecosystem, the front imaging module has become one of the core components of mobile devices, and its application scenarios widely cover diversified needs such as self-portrait imaging, video communication, online live broadcast and social interaction. With the continuous improvement of users' requirements for the image quality of mobile devices, the front lens technology has made breakthrough progress in the fields of pixel density improvement, low-light imaging optimization, fast focusing mechanism and anti-shake performance. Combined with artificial intelligence algorithms, modern front lens systems further integrate intelligent functions such as biometric recognition, dynamic expression tracking and augmented reality interaction, greatly expanding the dimension and application value of human-computer interaction. Under the trend of the compact design of mobile devices, the space utilization rate of the optical module directly restricts the industrial design level and function integration ability of terminal products.

[0003] As an artificial microstructured material with a sub-wavelength thickness, the metasurface realizes the precise regulation of the light field through the periodically arranged micro-nano units. This technology has strong manufacturing process compatibility and can be mass-produced by standardized processes such as photolithography and physical vapor deposition, with high cost-effectiveness. By reverse design to optimize the microstructure parameters, the metasurface can accurately reconstruct the target light field distribution characteristics, breaking through the physical limitations of traditional optical elements. In the field of mobile imaging, the integrated application of metasurface technology has double innovation values: on the one hand, it significantly reduces the space occupation and overall weight of the optical module, providing key technical support for terminal devices to break through the thickness bottleneck; on the other hand, it can integrate complex optical functions (such as chromatic aberration compensation, large field of view imaging, etc.), while reducing the number of traditional lenses used, improving the optical performance of the system.

[0004] The prior art adopts an innovative design of a refractive and metasurface hybrid architecture. Through the synergistic effect of the metasurface lens and traditional refractive elements, it effectively overcomes the performance limitations of a single optical system. This architecture utilizes the wavefront regulation ability of the metasurface to achieve optical path compression and function integration, achieving the optical characteristics of an equivalent long optical path within a limited physical space. This design strategy can reduce the axial size of the lens, and more importantly, break through the volume constraint of the traditional optical system through structural innovation, thus better meeting the stringent requirements of mobile devices for miniaturized optical modules. However, how to combine the metasurface lens with the traditional refractive lens for a combined design to achieve better optical performance and a smaller volume is still a challenge. Summary of the Invention

[0005] The object of the present invention is to provide a refractive - metasurface hybrid lens, an imaging module and a terminal device, aiming to solve the problem of how to optimize the combined design of a metasurface lens and a traditional lens to achieve better optical performance and a smaller volume.

[0006] To solve the above - mentioned technical problems, the object of the present invention is achieved through the following technical solutions: A refractive - metasurface hybrid lens is provided, including a plurality of lenses arranged in sequence along the optical axis from the object plane to the image plane; at least one of the lenses is a metasurface lens, and the remaining lenses are non - metasurface lenses; The refractive - metasurface hybrid lens satisfies: ; Wherein, MIC represents the maximum image circle of the refractive - metasurface hybrid lens, Fno represents the f - number, EFL represents the focal length, EPD represents the entrance pupil diameter, TTL represents the distance from the optical axis center of the object side of the first lens close to the object plane in the refractive - metasurface hybrid lens to the image plane.

[0007] Further, the refractive - metasurface hybrid lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the object plane to the image plane; Wherein, one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is a metasurface lens, and the remaining lenses are extended aspherical lenses.

[0008] Further, the first lens, the second lens, the third lens and the fourth lens are all extended aspherical lenses; the fifth lens is a metasurface lens; The first lens has a negative optical power, the object side of the first lens is convex, and the image side of the first lens is concave; The second lens has a positive optical power, the object side of the second lens is concave, and the image side of the second lens is convex; The third lens has a positive optical power, the object side of the third lens is a crescent - shaped concave surface, and the image side of the third lens is convex; The fourth lens has a negative optical power; the object side of the fourth lens is a concave surface with a central convex region, and the image side of the fourth lens is a convex surface with a central concave region; The fifth lens has a positive optical power, the object side of the fifth lens is a plane, and the image side of the fifth lens is a binary surface; micro - structures are arranged on the image side of the fifth lens.

[0009] Further, the object side surface of the first lens has a positive radius of curvature, and the image side surface of the first lens has a positive radius of curvature; The object side surface of the second lens has a positive radius of curvature, and the image side surface of the second lens has a negative radius of curvature; The object side surface of the third lens has a negative radius of curvature, and the image side surface of the third lens has a negative radius of curvature; The central region of the object side surface of the fourth lens has a positive radius of curvature, and the edge region of the object side surface of the fourth lens has a negative radius of curvature; the central region of the image side surface of the fourth lens has a negative radius of curvature, and the edge region of the image side surface of the fourth lens has a positive radius of curvature.

[0010] Further, the distance from the optical axis center of the object side surface of the first lens to the image plane TTL Satisfies: .

[0011] Further, the material of the fifth lens is silicon dioxide or silicon nitride; the thickness range of the fifth lens is 0.2 - 0.4 mm.

[0012] Further, the materials of the first lens, the second lens, the third lens, and the fourth lens are plastic or glass.

[0013] Further, the refractive - diffractive hybrid lens further includes: An aperture, which is located on the object side surface of the first lens, or in the optical path between the first lens and the second lens, or in the optical path between the second lens and the third lens.

[0014] Further, the focal length of the refractive - diffractive hybrid lens f Satisfies: f ≥2.2 mm.

[0015] Further, the diagonal field of view angle of the refractive - diffractive hybrid lens FOV Satisfies; FOV ≥90.9°.

[0016] Further, the distance from the optical axis center of the object side surface of the first lens of the refractive - diffractive hybrid lens to the image plane TTL Is greater than 2.81 mm .

[0017] Further, the entrance pupil diameter of the refractive - diffractive hybrid lens EPD Satisfies: 0.5 < EPD <0.9°.

[0018] An embodiment of the present invention further provides an imaging module, including the refractive - diffractive hybrid lens as described above.

[0019] An embodiment of the present invention further provides a terminal device, including the imaging module as described above.

[0020] The beneficial effects of the embodiments of the present invention are as follows: On the premise of ensuring the focal length and F the number, the number of lenses, TTL the total optical length, the overall volume and the manufacturing cost are significantly reduced, thereby constructing an optical system with a large field of view and a low F value. This not only improves the optical performance but also realizes a miniaturized and lightweight design. In addition, by utilizing the negative dispersion characteristic of the metasurface lens, achromatism is effectively achieved, thus achieving the effect of high-resolution imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 FIG. is a schematic structural diagram of a refractive-metamaterial hybrid lens provided by an embodiment of the present invention; Figure 2 FIG. is a schematic modulation curve diagram of a refractive-metamaterial hybrid lens provided by an embodiment of the present invention; Figure 3 FIG. is a schematic diagram of the spot diagram of a refractive-metamaterial hybrid lens provided by an embodiment of the present invention; Figure 4 FIG. is a schematic relative illumination diagram of a refractive-metamaterial hybrid lens provided by an embodiment of the present invention; Description of the reference numerals in the drawings: 110, first lens; 120, second lens; 130, third lens; 140, fourth lens; 150, fifth lens; 160, imaging surface; 170, aperture. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0024] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0025] It should also be understood that the terms used in this specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0026] It should be further understood that the term "and / or" used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] Please refer to Figure 1 , an embodiment of the present invention provides a refractive - metasurface hybrid lens, including a plurality of lenses sequentially arranged along the optical axis from the object plane to the image plane; at least one of the lenses is a metasurface lens; The refractive - metasurface hybrid lens satisfies: ; wherein, MIC represents the maximum image circle of the refractive - metasurface hybrid lens, Fno represents the f - number, EFL represents the focal length, EPD represents the entrance pupil diameter, TTL represents the distance from the optical axis center of the object side of the first lens close to the object plane in the refractive - metasurface hybrid lens to the image plane.

[0028] In this embodiment, based on the innovative design of the refractive - metasurface hybrid architecture that combines metasurface lenses and non - metasurface lenses (i.e., traditional refractive lenses), through the synergistic effect of metasurface lenses and non - metasurface lenses, the performance limitations of a single optical system are effectively overcome. This refractive - metasurface hybrid architecture utilizes the wavefront modulation ability of metasurface lenses to achieve optical path compression and function integration, achieving the optical characteristics of an equivalent long optical path within a limited physical space, and significantly reducing the volume and size of the optical system. This enables the technology to have broad application prospects in fields with increasing demands for miniaturization and integration, such as smart phones, wearable devices, and micro - cameras.

[0029] In this embodiment, on the premise of ensuring the focal length and F number (f - number), the number of lenses, TTL the total optical length, the overall volume, and the manufacturing cost are significantly reduced, thereby constructing a large field of view and low FThe optical system of the value not only improves the optical performance but also realizes the design of miniaturization and light weight. In addition, by utilizing the negative dispersion characteristics of the metasurface lens, achromatism is effectively achieved, thus achieving the effect of high-resolution imaging.

[0030] In one embodiment, the refractive-metamaterial hybrid lens includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150 sequentially arranged along the optical axis from the object plane to the image plane; among them, one of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 is a metasurface lens, and the remaining lenses are extended aspherical lenses.

[0031] In this embodiment, the metasurface lens is composed of a substrate and microstructures disposed on the substrate. The microstructures are composed of an array of sub-wavelength scale micro-nano units. Each micro-nano unit structure has a specific shape, size, and arrangement to achieve precise control of the phase, amplitude, or polarization state of the incident light wave. Through the design of the microstructures, the metasurface lens can achieve optical performance equivalent to or even better than that of traditional lenses while maintaining a thin and light volume, such as high light transmittance, low chromatic aberration, low distortion, etc.

[0032] In this embodiment, the extended aspherical lenses are made of traditional optical materials, such as glass or plastic. Their surfaces are precision machined into aspherical shapes to achieve the focusing or diverging effect of light. These extended aspherical lenses combined with the metasurface lens can give full play to their respective advantages and further improve the optical performance of the refractive-metamaterial hybrid lens. For example, the extended aspherical lenses can compensate for the possible tiny errors of the metasurface lens to a certain extent, making the optical performance of the entire refractive-metamaterial hybrid lens more stable and excellent. Further, the materials of the extended aspherical lenses are preferably plastic, which has high plasticity and processing flexibility, can meet the design requirements of various complex shapes, and the plastic material is lighter than the glass material, which helps to reduce the overall weight of the refractive-metamaterial hybrid lens.

[0033] In this embodiment, under the arrangement design of the five lenses designed above, the distance from the optical axis center of the object side of the first lens 110 to the image plane TTL satisfies: . The refractive-metamaterial hybrid lens within this range can achieve a more compact and lightweight design while ensuring sufficient imaging quality and field of view. In addition, this TTL value range also considers the adaptability of the refractive-metamaterial hybrid lens in various application scenarios to ensure that it can present clear images under different light conditions and shooting distances.

[0034] In some preferred embodiments, the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 are all extended aspherical lenses; the fifth lens 150 is a metasurface lens; The first lens 110 has a negative focal power. The object side surface of the first lens 110 is convex and has a positive radius of curvature, and the image side surface of the first lens 110 is concave and has a positive radius of curvature; The second lens 120 has a positive focal power. The object side surface of the second lens 120 is concave and has a positive radius of curvature, and the image side surface of the second lens 120 is convex and has a negative radius of curvature; The third lens 130 has a positive focal power. The object side surface of the third lens 130 is a crescent-shaped concave surface and has a negative radius of curvature, and the image side surface of the third lens 130 is convex and has a negative radius of curvature; The fourth lens 140 has a negative focal power; the object side surface of the fourth lens 140 is a concave surface with a central convex region, and the image side surface of the fourth lens 140 is a convex surface with a central concave region; the central region of the object side surface of the fourth lens 140 has a positive radius of curvature, and the edge region of the object side surface of the fourth lens 140 has a negative radius of curvature; the central region of the image side surface of the fourth lens 140 has a negative radius of curvature, and the edge region of the image side surface of the fourth lens 140 has a positive radius of curvature.

[0035] The fifth lens 150 has a positive focal power. The object side surface of the fifth lens 150 is a plane, and the image side surface of the fifth lens 150 is a binary surface; microstructures are arranged on the image side surface of the fifth lens 150.

[0036] In this preferred embodiment, by combining different lenses and designing the surface shapes and focal powers of each lens, good imaging effects and optical performances can be achieved. Specifically, the negative focal power of the first lens 110 helps correct wide-angle distortion, making the imaging more realistic; the positive focal power of the second lens 120 enhances the imaging clarity in the central region, and at the same time, the design of its double convex surfaces helps the convergence of light rays, improving the imaging brightness; the crescent-shaped concave surface of the third lens 130 can effectively reduce chromatic aberration and improve color reproduction; the complex curved surface design of the fourth lens 140 further optimizes aberration correction, making the image edge clearer and the details richer; and as a metasurface lens, the fifth lens 150, with the design of its plane object side surface and binary image side surface, as well as the arrangement of microstructures, endows the lens with unique diffractive optical characteristics, further enhancing the imaging resolution and contrast. Generally speaking, the lens combination design in this preferred embodiment, through fine optical calculations and surface shape optimizations, achieves excellent optical performances and imaging effects. Further, the material of the fifth lens 150 can be silicon dioxide or silicon nitride, etc.; the thickness range of the fifth lens 150 is 0.2 - 0.4 mm.

[0037] In one embodiment, the catadioptric hybrid lens further includes a diaphragm 170, which is located on the object side of the first lens 110, or in the optical path between the first lens 110 and the second lens 120, or in the optical path between the second lens 120 and the third lens 130.

[0038] In this embodiment, the design of the diaphragm 170 helps to control the path of light passing through the lens, reduce the interference of stray light, and thus improve the imaging quality. The position of the diaphragm 170 can be adjusted according to actual needs to achieve the best imaging effect. When the diaphragm 170 is located on the object side of the first lens 110, it can effectively limit the angle of light entering the lens and reduce the interference of marginal light. When the diaphragm 170 is located in the optical path between the lenses, it can more finely regulate the light distribution between different lenses and further optimize the imaging performance.

[0039] In this embodiment, the specific position setting of the diaphragm 170 can be any of the following configurations: (a) in front of the object side of the first lens 110 and at a position 0.1 TTL ±0.05 TTL from the vertex of the first lens 110; (b) between the first lens 110 and the second lens 120 and close to the image side of the first lens 110; (c) between the second lens 120 and the third lens 130 and close to the image side of the second lens 120. Preferably, the diaphragm 170 is configured at position (a) to control the incident light cone angle and suppress off-axis aberrations.

[0040] It can be understood that the main function of the diaphragm 170 is to intercept and limit light. At different positions, the aperture of the light beam will be different. By reasonably setting the size of the diaphragm 170, the same diaphragm 170 effect can be achieved at different positions.

[0041] Based on the above scheme, the focal length of the catadioptric hybrid lens f satisfies: f ≥2.2mm.

[0042] Based on the above scheme, the diagonal field of view angle of the catadioptric hybrid lens FOV satisfies: FOV ≥90.9°.

[0043] Based on the above scheme, the distance from the optical axis center of the object side of the first lens close to the object plane to the image plane in the catadioptric hybrid lens TTL is greater than 2.81 mm .

[0044] Based on the above scheme, the entrance pupil diameter of the catadioptric hybrid lens EPD satisfies: 0.5 < EPD < 0.9°.

[0045] Based on the preferred embodiments in the above examples, the optical parameter data of the lens will be introduced in more detail. Specifically, as Figure 1 shown, the refractive - diffractive hybrid lens includes a diaphragm 170, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and an imaging surface 160, which are sequentially arranged along the optical axis from the object surface to the image surface; the fifth lens 150 is a metasurface lens, and the remaining lenses are extended aspherical lenses made of plastic material; the incident light enters through the object side surface of the diaphragm 170, passes through the first lens 110, and then sequentially passes through the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150, and finally converges on the imaging surface 160.

[0046] The optical parameter data of this refractive - diffractive hybrid lens can refer to the example in Table 1: Table 1

[0047] In Table 1, the surface number is numbered according to the surface order of each lens. For example, the surface number 1 represents the diaphragm 170, the surface numbers 2 and 3 represent the object side surface and the image side surface of the first lens 110, and so on. The last surface number 12 represents the imaging surface 160; among them, the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, a negative value represents that the surface bends towards the object side, "Standard" represents a standard surface, "Extended sphere" represents an extended aspherical surface, "Binary2" represents a binary surface, "Infinity" represents that the surface is a plane, 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 both millimeters (mm), and the aperture represents the effective light - passing diameter of the lens at each position.

[0048] Among them, the surface shape of each extended aspherical lens satisfies the following equation: ; Among them, z represents the distance along the optical axis from the vertex of the extended aspherical surface, r represents the height from the optical axis, c represents the curvature 1 / R , R represents the radius of curvature at the vertex of the lens; k represents the conic coefficient, Ai represents the aspherical high - order coefficient, ρ represents the normalized radial coordinate.

[0049] Among them, the conic coefficient k and the high - order term coefficient Ai of each extended aspherical lens are as shown in Table 2 below: Table 2

[0050] In Table 2, -0.425 represents the specific value of the conic coefficient k for surface number 2, and -0.078 represents the specific value of the coefficient A3 for surface number 2, and so on.

[0051] Among them, the metasurface phase of the fifth lens 150 (i.e., the metasurface lens) can refer to the example in Table 3: Table 3

[0052] In Table 3, R1 represents the normalized radius of the binary surface of the metasurface lens.

[0053] In a preferred specific embodiment of this example, the focal length f and the entrance pupil diameter EPD and the maximum image circle satisfy: ; the total optical lens length TTL and the entrance pupil diameter EPD satisfy: .

[0054] The working wavelength band of the refractive-metasurface hybrid lens provided by the preferred specific embodiment of this example is 470 - 650 nm, F the numerical aperture is 2.29, the focal length f is 2.23 mm, and the maximum full field of view FOV is 90.9°, meeting the requirements of lens use.

[0055] Figure 2 This is the modulation curve graph of the refractive-metasurface hybrid lens provided by the embodiment of the present invention at a frequency of 100 line pairs per millimeter. Its curve is smooth, the value is high, and the evaluation value of the edge field of view is close to 30%, capable of providing high-quality imaging.

[0056] Figure 3 This is the spot diagram of the refractive-metasurface hybrid lens provided by the embodiment of the present invention. For the refractive-metasurface hybrid lens provided by the embodiment of the present invention, the spot pattern is relatively concentrated and evenly distributed throughout the wavelength band, capable of meeting the requirements of high-resolution imaging.

[0057] Figure 4 This is the relative illumination diagram of the refractive-metasurface hybrid lens provided by the embodiment of the present invention, which represents the relative illumination values corresponding to different fields of view. As Figure 4 shown, within the working wavelength band of the refractive-metasurface hybrid lens provided by the embodiment of the present invention, the relative illumination within 0.7 field of view is greater than 39%, and the brightness is uniform.

[0058] In summary, the refractive-metasurface hybrid lens provided by the embodiment of the present invention has a large viewing angle, clear imaging, TTL small aberration, and can meet the requirements of high-resolution imaging and integration with light weight.

[0059] An embodiment of the present invention further provides an imaging module, which includes the above-mentioned refractive and diffractive hybrid lens.

[0060] An embodiment of the present invention further provides a terminal device, which includes the above-mentioned imaging module. The terminal device may be an electronic device such as a mobile phone, a tablet computer, a wearable device, etc.

[0061] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A refractive and diffractive hybrid lens, characterized in that, It includes a plurality of lenses sequentially arranged along the optical axis from the object plane to the image plane; at least one of the lenses is a metasurface lens, and the remaining lenses are non-metasurface lenses; The folded and ultra hybrid lens satisfies: ; Among them, MIC represents the maximum image circle of the refractive and diffractive hybrid lens, Fno represents the f-number, EFL represents the focal length, EPD represents the entrance pupil diameter, TTL represents the distance from the optical axis center of the object side of the first lens close to the object surface in the refractive and diffractive hybrid lens to the image surface.

2. The folding and ultra - hybrid lens according to claim 1, characterized in that, The refractive-metamaterial hybrid lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged along the optical axis from the object plane to the image plane; Among them, one of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is a metasurface lens, and the remaining lenses are extended aspherical lenses.

3. The folding and ultra-mixing lens according to claim 2, wherein The first lens, the second lens, the third lens, and the fourth lens are all extended aspherical lenses; the fifth lens is a metasurface lens; The first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; The second lens has a positive optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; The third lens has a positive optical power, the object side surface of the third lens is a crescent-shaped concave surface, and the image side surface of the third lens is convex; The fourth lens has a negative optical power; the object side surface of the fourth lens is a concave surface with a central convex region, and the image side surface of the fourth lens is a convex surface with a central concave region; The fifth lens has a positive optical power, the object side surface of the fifth lens is a plane, and the image side surface of the fifth lens is a binary surface; microstructures are arranged on the image side surface of the fifth lens.

4. The folding and ultra - hybrid lens according to claim 3, characterized in that, The object side surface of the first lens has a positive radius of curvature, and the image side surface of the first lens has a positive radius of curvature; The object side surface of the second lens has a positive radius of curvature, and the image side surface of the second lens has a negative radius of curvature; The object side surface of the third lens has a negative radius of curvature, and the image side surface of the third lens has a negative radius of curvature; The central region of the object side surface of the fourth lens has a positive radius of curvature, and the edge region of the object side surface of the fourth lens has a negative radius of curvature; the central region of the image side surface of the fourth lens has a negative radius of curvature, and the edge region of the image side surface of the fourth lens has a positive radius of curvature.

5. The folded and ultra - hybrid lens according to claim 3, characterized in that, The distance from the optical axis center of the object side of the first lens to the image plane TTL Satisfies: .

6. The refractive-superimposed hybrid lens according to claim 3, characterized in that, The material of the fifth lens is silicon dioxide or silicon nitride; the thickness range of the fifth lens is 0.2 - 0.4 mm.

7. The hybrid refractive and diffractive lens according to claim 3, wherein, The materials of the first lens, the second lens, the third lens, and the fourth lens are plastic or glass.

8. The folding and ultra - hybrid lens according to claim 2, wherein, It further includes: A diaphragm, which is located on the object side surface of the first lens, or in the optical path between the first lens and the second lens, or in the optical path between the second lens and the third lens.

9. The folding and ultra - hybrid lens according to claim 1, characterized in that, The focal length of the folding and ultra-mixing lens f Satisfies: f ≥ 2.2 mm.

10. The folding and ultra-mixing lens according to claim 1, characterized in that, The diagonal field of view of the folding ultra hybrid lens FOV satisfies FOV ≥90.9°.

11. The refractive and diffractive hybrid lens according to claim 1, wherein, The distance from the optical axis center of the object side of the first lens close to the object surface in the folding super hybrid lens to the image surface TTL is greater than 2.81 mm .

12. The folding and ultra-mixing lens according to claim 1, wherein, The entrance pupil diameter of the folded and ultra-mixed lens EPD Satisfies: 0.5 < EPD < 0.9°.

13. A camera module, characterized in that, It includes the refractive-metamaterial hybrid lens according to any one of claims 1 to 12.

14. A terminal device, characterized in that, It includes the imaging module according to claim 13.

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