Folding and super hybrid small-size lens, camera module and terminal equipment
By employing a combination of metasurface lenses and aspherical lenses in mobile phone lenses, the problem of achieving ultra-thinness and high image quality in traditional lenses has been solved, enabling lenses to be lightweight and thin while achieving high-performance imaging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-23
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional mobile phone lenses are difficult to make ultra-thin and simple in structure, and the large coefficient of thermal expansion of plastic lens materials makes it difficult to express color difference, resulting in technical difficulties in making lenses thinner and lighter and higher in image quality.
The system employs a structure with at least five lenses, at least one of which is a metasurface lens. Combined with an aspherical lens, the system utilizes the phase modulation function and material properties of the metasurface lens to design an imaging system that achieves high image quality and ultra-thinness. The light path is optimized by rationally allocating the metasurface phase and cooperating with traditional optical materials.
It achieves ultra-thin lens, low chromatic aberration and high image quality, meets the specifications of a total lens length of less than 2.6mm and a principal beam angle of less than 41 degrees in the 435nm-650nm wavelength range, and improves the lens's high and low temperature reliability and imaging performance.
Smart Images
Figure CN121806249A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Embodiments of the present application relate to the field of optical lenses, and in particular to a fold-hybrid small-size lens, a camera module and a terminal device. BACKGROUND
[0002] With the development and gradual expansion of market share of smart phones and tablets, people's requirements for the performance of phone lenses and tablets are gradually increasing. Since the 21st century, the pixels of mobile phones have developed from millions of pixels to the demand index of tens of millions of pixels. At the same time, with the development of the consumer market, consumers have increasingly high requirements for the overall imaging performance of mobile phones, such as image quality, purple edges, and stray light. At the same time, mobile phones and tablets have been developing towards thinness, and the lenses protruding from the body have become an important shortcoming criticized by most consumers, which makes it necessary to research mobile phone and tablet lenses with simple structure, miniaturization and ultra-thin high image quality.
[0003] However, the traditional refractive lens mobile phone lens must use a curved lens to obtain the ability to deflect light rays, which makes it necessary for the refractive lens to occupy a certain axial space, making it difficult to achieve ultra-thin. At the same time, because the traditional mobile phone lens material usually uses a full-plastic structure, the thermal expansion coefficient of the plastic material is large, and the high-low temperature reliability performance is poor. In addition, because the refractive index of the plastic lens material is low, it is relatively more difficult to achieve the chromatic aberration performance required by the mobile phone lens. Therefore, how to achieve the ultra-thin, simple structure of the mobile phone, tablet and other terminal device lenses has been a technical difficulty. SUMMARY
[0004] The present application provides a fold-hybrid small-size lens, which reduces the total length of the mobile phone lens while ensuring the focal length and focal number, and achieves high image quality and ultra-low chromatic aberration imaging characteristics. F
[0005] Embodiments of the present application provide a fold-hybrid small-size lens, the lens comprising at least five lenses along the optical axis from the object plane to the image plane, wherein at least one lens is a super surface lens, and the remaining lenses are aspherical lenses, the super surface lens is composed of a substrate and a super surface micro-nano structure arranged on the substrate; The small-size lens satisfies: ; ; wherein, MIC is the maximum image circle size, TTL is the total length of the lens.
[0006] Optionally, the small volume lens comprises, in sequence from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the sixth lens is a metasurface lens.
[0007] Further, the first lens is an aspherical lens with positive focal power, the object side of which is convex, and the image side of which is concave, and the object side and the image side of the first lens are both aspherical. The second lens is an aspherical lens with negative focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the second lens are both aspherical. The third lens is an aspherical lens with negative focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the third lens are both aspherical. The fourth lens is an aspherical lens with positive focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the fourth lens are both aspherical. The fifth lens is an aspherical lens with positive focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the fifth lens are both aspherical. The sixth lens is a metasurface lens with positive focal power, the object side of which has a metasurface micro-nano structure, and the image side of which is a plane. The materials of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are plastic.
[0008] Optionally, the small volume lens comprises, in sequence from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the fifth lens is a metasurface lens.
[0009] Further, the first lens is an aspherical lens with positive focal power, the object side of which is convex, and the image side of which is concave, and the object side and the image side of the first lens are both aspherical. The second lens is an aspherical lens with negative focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the second lens are both aspherical. The third lens is an aspherical lens with positive focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the third lens are both aspherical. The fourth lens is an aspherical lens with positive focal power, the object side of which is concave, and the image side of which is convex, and the object side and the image side of the fourth lens are both aspherical. The fifth lens is a metasurface lens with positive focal power, the object side of which has a metasurface micro-nano structure, and the image side of which is a plane.
[0010] The material of the first lens, the second lens, the third lens and the fourth lens is plastic.
[0011] Optionally, the small-volume lens further comprises a diaphragm, and the diaphragm is located in front of the first lens.
[0012] Optionally, the focal length of the small-volume lens f satisfies: .
[0013] Optionally, the aperture number of the small-volume lens F satisfies: .
[0014] Optionally, the field of view angle of the small-volume lens FOV satisfies: .
[0015] The application further provides a small-volume camera module with fold and superimposition, which comprises the small-volume lens.
[0016] The application further provides a small-volume terminal device with fold and superimposition, which comprises the small-volume camera module.
[0017] The small-volume lens with fold and superimposition provided by the embodiment of the application comprises at least five lenses, wherein at least one lens is a super surface lens, and the remaining lenses are super surface lenses. Furthermore, the phase of the super surface is reasonably distributed, so that the small-volume lens satisfies: , , , The small-volume lens not only has a simple structure and saves cost, but also guarantees the stability of performance under high-low temperature reliability test. Meanwhile, the F number of the small-volume lens satisfies , which guarantees sufficient light quantity and clear imaging in a relatively dark environment.
[0018] In addition, the small-volume lens with fold and superimposition satisfies the specification requirement that the total length of the lens is less than or equal to 2.6mm and the chief ray angle (CRA) is less than 41° in the full field of view angle range of 435nm-650nm wavelength, which solves the problems of excessive total length and poor matching between CRA and the sensor in the prior art. TTL BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 is a structure schematic diagram of the small-volume lens with fold and superimposition provided by the embodiment 1 of the application; Figure 2 is an MTF schematic diagram of the small-volume lens with fold and superimposition provided by the embodiment 1 of the application; Figure 3 is a diffraction spot diagram of a folded hyper-hybrid small volume lens provided by embodiment 1 of the present application; Figure 4 is an axial chromatic aberration diagram of a folded hyper-hybrid small volume lens provided by embodiment 1 of the present application; Figure 5 is a structure diagram of a folded hyper-hybrid small volume lens provided by embodiment 2 of the present application; Figure 6 is an MTF diagram of a folded hyper-hybrid small volume lens provided by embodiment 2 of the present application; Figure 7 is a diffraction spot diagram of a folded hyper-hybrid small volume lens provided by embodiment 2 of the present application; Figure 8 is an axial chromatic aberration diagram of a folded hyper-hybrid small volume lens provided by embodiment 2 of the present application.
[0020] BRIEF DESCRIPTION OF DRAWINGS 110, diaphragm; 120, first lens; 130, second lens; 140, third lens; 150, fourth lens; 160, fifth lens; 170, sixth lens; 200, imaging surface. DETAILED DESCRIPTION
[0021] The present application will be further described in detail below with reference to the accompanying drawings.
[0022] A metasurface is an artificial material with a thickness less than the wavelength, composed of a series of nanoscale micro-nano structures. The manufacturing process of the metasurface is relatively simple, and can be made by conventional photolithography, sputtering, spraying, etc., with low cost. The light field information can be collected by reasonable design of the metasurface to obtain the image of the object. The metasurface controls the phase, amplitude and propagation direction of light by adjusting the micro-nano structure (usually a nano-scale structure unit), so as to achieve the purpose of manipulating light waves. In addition, the dispersion of the metasurface is very different from that of traditional optical materials. The dispersion of traditional optical materials is large at short wavelengths and small at long wavelengths, while the dispersion of the metasurface is completely opposite, which is conducive to the correction of secondary spectrum. In addition, the Abbe number of the metasurface is opposite in sign to the dispersion value of the traditional optical material, which is also conducive to the correction of chromatic aberration. In addition, the process characteristics of the metasurface make it possible to be made on a very thin plane, which makes it difficult to insert more lenses to improve performance under the condition of limited space in traditional lenses, but it is possible to insert metasurface lenses to improve the overall performance, so that the total length specification can also be shorter.
[0023] The folded hyper-hybrid system combines the optical properties of traditional optical materials and metasurfaces, and has a strong application space in the application scenarios of mobile phones, such as ultra-thin, miniaturization and high image quality.
[0024] The small-volume lens provided by the embodiment of the present application comprises at least five lenses along the optical axis from the object plane to the image plane, wherein at least one lens is a super surface lens, and the rest are aspherical lenses, the material of the aspherical lenses is plastic, and the super surface lens is composed of a substrate and a super surface micro-nano structure arranged on the substrate. Since the substrate material of the super surface lens is a flat glass, the axial space occupies a smaller position while maintaining the phase contribution, so that the purpose of smaller total length can be achieved, so that the small-volume lens meets: , ; wherein, MIC is the maximum image circle size, TTL is the total length of the lens.
[0025] By using the powerful phase modulation function of the super surface lens, the chief ray angle CRA of the light ray hitting the image plane can be effectively regulated in a compact space, and the adaptation function with the sensor can be completed.
[0026] In the present application, the substrate material of the super surface lens is borosilicate glass. By matching the materials and optical powers of each lens, athermal design is achieved, which not only reduces the material cost, but also reduces the volume of the system.
[0027] Meanwhile, each micro-nano structure of the super surface lens has a specific shape, size and arrangement to accurately regulate the phase, amplitude or polarization state of the incident light wave. Through the design of the micro-nano structure, the super surface lens can achieve optical performance comparable to or even better than traditional lenses while maintaining a thin volume, such as high light transmittance, low chromatic aberration, low distortion, etc. The period of the micro-nano structure of the super surface lens ranges from 250-400nm, and the best period in the present embodiment is 350nm; the height of the micro-nano structure is 600-1000nm, and the best height in the present embodiment is 600nm; the diameter of the micro-nano structure covers 100-250nm, the material is silicon dioxide, and the shape arrangement is square, regular hexagon, etc.
[0028] In addition, in order to control the path of the light passing through the lens and reduce the interference of stray light, thereby improving the imaging quality, the small-volume lens further comprises a diaphragm 110, which is located before the first lens 120.
[0029] Based on the above scheme, the small-volume lens also meets: , , , so that the small-volume lens has a shorter total optical length and a larger light input.
[0030] Meanwhile, the small-volume lens provided by the embodiment of the present application also meets the total length of the lens TTLThe specification requirement of less than or equal to 2.6mm and chief ray angle (CRA) less than 41 degrees solves the problems of long total length and poor matching between CRA and sensor in the prior art.
[0031] The following are two specific embodiments of the present application, wherein the small volume lens in embodiment 1 is composed of six lenses, and the small volume lens in embodiment 2 is composed of five lenses. Embodiment
[0032] Table 1 is a hyper-combination of a small volume lens provided by embodiment 1.
[0033] Table 1
[0034] Reference Figure 1 , the small volume lens provided by embodiment 1 of the present application comprises, in order along the optical axis from the object plane to the image plane, a diaphragm 110, a first lens 120, a second lens 130, a third lens 140, a fourth lens 150, a fifth lens 160, a sixth lens 170 and an imaging plane 200.
[0035] The first lens 120 is an aspherical lens with positive focal power, the object side is convex, and the image side is concave. The object side and the image side of the first lens 120 are both aspherical surfaces. The second lens 130 is an aspherical lens with negative focal power, the object side is concave, and the image side is convex. The object side and the image side of the second lens 130 are both aspherical surfaces. The third lens 140 is an aspherical lens with negative focal power, the object side is concave, and the image side is convex. The object side and the image side of the third lens 140 are both aspherical surfaces. The fourth lens 150 is an aspherical lens with positive focal power, the object side is concave, and the image side is convex. The object side and the image side of the fourth lens 150 are both aspherical surfaces. The fifth lens 160 is an aspherical lens with positive focal power, the object side is concave, and the image side is convex. The object side and the image side of the fifth lens 160 are both aspherical surfaces. The sixth lens 170 is a hyper-surface lens with positive focal power. The object side of the sixth lens 170 has a hyper-surface micro-nano structure, and the image side is a plane.
[0036] As shown in Figure 1 , the incident light passes through the diaphragm 110, enters through the object side of the first lens 120, passes through the second lens 130, the third lens 140, the fourth lens 150, the fifth lens 160 and the sixth lens 170, and finally converges on the imaging plane 200.
[0037] For example, table 2 details the specific optical data parameters of each lens in the small volume lens provided by embodiment 1 of the present application in a feasible implementation manner. The optical data parameters in table 2 correspond to Figure 1The small volume lens shown.
[0038] Table 2
[0039] Wherein, the surface number is numbered according to the surface sequence of each lens, for example, the surface number 1 represents the stop 110, the surface number 2 represents the object side surface of the first lens 120, and so on, until the surface number 14 represents the imaging surface 200. Wherein, the radius of curvature represents the bending degree of the lens surface, the positive value represents that the surface bends to the image side, and the negative value represents that the surface bends to the object side, wherein "STOP" represents the stop, "Infinity" represents infinity, "Standard" represents the standard surface, "Even Asphere" represents the aspheric surface, and "IMAGE" represents the imaging surface 200; the interval represents the center axis distance from the current surface to the next surface, and the units of the radius of curvature, the interval, the aperture and the focal length are millimeters (mm).
[0040] The even aspheric surface type satisfies the following equation: Wherein, z is the distance of the even aspheric surface along the optical axis from the vertex thereof, 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, a2, a3, a4, a5, a6, a7, a8 are high-order coefficients of the aspheric surface.
[0041] For example, table 3 details the conic coefficient k and the high-order coefficient a2, a3, a4, a5, a6, a7, a8 of the aspheric surface of the lens in embodiment 1 in a feasible implementation manner.
[0042] Table 3
[0043] Wherein, -4.01E-03 represents that the coefficient a2 of the surface number 2 is -4.01E-03, and so on.
[0044] For example, table 4 details the phase of the super surface in embodiment 1 in a feasible implementation manner.
[0045] Table 4
[0046] Wherein, R1 is the normalized radius of the binary surface.
[0047] The working waveband of the small volume lens provided by embodiment 1 is visible light, F The number is 2.4, and the focal length EFLIt measures 2.24mm. The entrance pupil diameter is relatively large, allowing ample light intake and providing high resolution, meeting the requirements for thermal imaging technology.
[0048] Figure 2 The MTF diagram of the small-volume lens provided in Embodiment 1 of the present invention shows that the MTF is greater than 0.6 within a 0.8F field of view at 100 lp / mm, which can meet the requirements of high-resolution imaging.
[0049] Figure 3 This is a schematic diagram of the blur pattern of the small-volume lens provided in Embodiment 1 of the present invention. The small-volume lens provided in Embodiment 1 of the present invention has a relatively concentrated and uniformly distributed blur pattern across the entire long-wavelength band, which can meet the requirements of high-resolution imaging.
[0050] Figure 4 This is a schematic diagram of the transverse chromatic aberration of a small-volume lens provided in Embodiment 1 of the present invention, which represents the transverse chromatic aberration values corresponding to different fields of view, such as... Figure 4 As shown, the small-volume lens provided in Embodiment 1 of the present invention has a transverse chromatic aberration value of <1.5 within a 0.8 field of view in the working wavelength band. . Example
[0051] Table 5 shows the parameters of a small-volume lens for a superconducting hybrid lens provided in Example 2.
[0052] Table 5
[0053] refer to Figure 5 Embodiment 2 of the present invention provides a small-volume lens with a hybrid refractive and hyper-refractive structure, comprising an aperture stop 110, a first lens 120, a second lens 130, a third lens 140, a fourth lens 150, a fifth lens 160, and an imaging plane 200 arranged sequentially along the optical axis from the object plane to the image plane.
[0054] Among them, 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 surface and the image-side surface of the first lens 120 are aspherical. The second lens 130 is an aspherical lens with negative optical power, its object-side surface is concave and its image-side surface is convex; both the object-side surface and the image-side surface of the second lens 130 are aspherical. The third lens 140 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 surface and the image-side surface of the third lens 140 are aspherical. The fourth lens 150 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 surface and the image-side surface of the fourth lens 150 are aspherical. The fifth lens 160 is a metasurface lens with positive optical power, its object-side surface has a metasurface micro / nano structure, and its image-side surface is planar.
[0055] like Figure 5As shown, the incident light passes through the aperture 110, enters through the object side of the first lens 120, passes through the second lens 130, the third lens 140, the fourth lens 150 and the fifth lens 160, and finally converges on the imaging surface 200.
[0056] For example, Table 6 details the specific optical data parameters of each lens in a hybrid refractive-hyper-magnification small-volume lens provided in Embodiment 2 of the present invention, according to a feasible implementation. The optical data parameters in Table 6 correspond to... Figure 5 The small-sized lens shown.
[0057] Table 6
[0058] The surface numbering follows the order of the lenses' surfaces. For example, surface number 1 represents aperture 110, surface number 2 represents the object side of the first lens 120, and so on, until surface number 12 represents imaging surface 200. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates the surface bends towards the image plane, and a negative value indicates the surface bends towards the object plane. "STOP" represents aperture 110, "Infinity" represents infinity, "Standard" represents the standard surface, "Even Asphere" represents the aspherical surface, and "IMAGE" represents imaging surface 200. The spacing represents the axial distance between the current surface and the next surface. The units for radius of curvature, spacing, aperture, and focal length are all millimeters (mm).
[0059] 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.
[0060] For example, Table 7 details the conic coefficient k and higher-order coefficients a2, a3, a4, a5, a6, a7, and a8 of the aspherical lens surface in this embodiment 2 according to a feasible implementation.
[0061] Table 7
[0062] Here, -8.72E-04 indicates that the coefficient a2 with surface number 1 is -8.72E-04, and so on.
[0063] For example, Table 8 details the phase of the metasurface in this embodiment 2 with a feasible implementation.
[0064] Table 8
[0065] Where R1 is the normalized radius of the binary surface.
[0066] For the analysis of each surface in Table 6, please refer to Example 1. This Example 2 will not be analyzed further.
[0067] In summary, the super-hybrid achromatic mobile phone lenses provided in Embodiments 1 and 2 of the present invention are small in size, short in total length, high in image quality, and low in chromatic aberration.
[0068] The present invention also provides a small-volume camera module with a folding-hyper-folding hybrid design, which includes the aforementioned small-volume lens.
[0069] The present invention also provides a small-volume terminal device that combines folding and supersonic technologies, which includes the aforementioned small-volume camera module.
[0070] 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.
[0071] 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 hybrid refractive and hyperspectral lens with a small volume, comprising at least five lenses along the optical axis from the object plane to the image plane, characterized in that, At least one of the lenses is a metasurface lens, and the remaining lenses are aspherical lenses. The metasurface lens is composed of a substrate and a metasurface micro / nano structure disposed on the substrate. The small-volume lens satisfies the following requirements: ； ； ； in, MIC For the largest image circle size, TTL This refers to the total length of the lens.
2. The small-volume lens according to claim 1, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the sixth lens is a metasurface lens.
3. The small-volume lens according to claim 2, 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 an aspherical lens with negative optical power, its object side is concave and its image side is convex; both the object side and the image side of the second lens are aspherical. The third lens is an aspherical lens with negative optical power, its object side is concave and its image side is convex, and both the object side and the image side of the third lens are aspherical. The fourth lens is an aspherical lens with positive optical power, its object side is concave and its image side is convex, and both the object side and the image side of the fourth lens are aspherical. The fifth lens is an aspherical lens with positive optical power, its object side is concave and its image side is convex, and both the object side and the image side of the fifth lens are aspherical. The sixth lens is a metasurface lens with positive optical power. The object side of the sixth lens has a metasurface micro / nano structure, and the image side is a plane. The first lens, second lens, third lens, fourth lens, and fifth lens are made of plastic.
4. The small-volume lens according to claim 1, characterized in that, The small-volume lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the fifth lens is a metasurface lens.
5. The small-volume lens according to claim 4, 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 an aspherical lens with negative optical power, its object side is concave and its image side is convex; both the object side and the image side of the second lens are aspherical. The third lens is an aspherical lens with positive optical power, its object side is concave and its image side is convex, and both the object side and the image side of the third lens are aspherical. The fourth lens is an aspherical lens with positive optical power, its object side is concave and its image side is convex, and both the object side and the image side of the fourth lens are aspherical. The fifth lens is a metasurface lens with positive optical power. The object side of the fifth lens has a metasurface micro / nano structure, and the image side is a plane. The first lens, the second lens, the third lens, and the fourth lens are made of plastic.
6. The small-volume lens according to claim 1, characterized in that, The small-volume lens also includes an aperture stop, which is located in front of the first lens.
7. The small-volume lens according to claim 1, characterized in that, The focal length of the small-volume lens f satisfy: .
8. The small-volume lens according to claim 1, characterized in that, The aperture of the small-volume lens F satisfy: .
9. The small-volume lens according to claim 1, characterized in that, The field of view of the small-volume lens FOV satisfy: .
10. A small-volume camera module with a hybrid folding and supersonic imaging capability, characterized in that, Including the small-volume lens as described in any one of claims 1 to 9.
11. A small-volume terminal device with a hybrid folding and super-high-volume configuration, characterized in that, Including the small-volume camera module as described in claim 10.