Dms anamorphic lens, camera module and terminal device

Abstract

The application discloses a DMS folded hyper lens, a camera module and a terminal device, the DMS folded hyper lens comprising a first lens, an aperture, a second lens, a third lens and a filter which are sequentially arranged along an optical axis from an object plane to an image plane; the second lens is a super surface lens; the first lens and the third lens are resin lenses. The application combines the super surface lens with the traditional refractive lens to construct a folded hyper hybrid system, reduces the optical total length, volume and cost of the lens while ensuring the field of view angle and F number, so as to realize the miniaturization and light weight of the DMS folded hyper lens. In addition, the DMS folded hyper lens can realize high-resolution imaging in a wide waveband range of 890-990 nm.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of visible light photography, in particular to a DMS folding super lens, a camera module and a terminal device. BACKGROUND

[0002] The automobile industry is accelerating the transformation towards intelligence and networking, and automobiles are gradually evolving from traditional transportation tools to mobile intelligent terminals. Among many intelligent applications, the driver state monitoring system (DMS) as an important component can work cooperatively with the advanced driver assistance system (ADAS) and other systems to comprehensively improve driving safety and comfort. For example, when the DMS detects that the driver is distracted, it can link the ADAS system to adjust the adaptive cruise speed or trigger the lane keeping reminder, thereby reducing the risk of accidents.

[0003] The existing DMS relies on cameras to collect driver facial and eye features, and is usually arranged at positions such as above the steering wheel, near the instrument panel or rearview mirror, etc. to obtain the best imaging angle. By analyzing the opening and closing state of the eyes, the blinking frequency, the head posture and other indicators, the system can identify whether the driver is in a state of fatigue or distraction. However, it still faces challenges to achieve high-quality imaging in the limited vehicle space, especially under the trend of increasingly miniaturized and ultra-thin devices, the volume and structure of the traditional DMS camera still have room for optimization.

[0004] As a cutting-edge optical technology, the metasurface can precisely control the phase, amplitude and polarization state of light waves by constructing subwavelength micro-nano structures (such as nano antennas, hole arrays, etc.) in a two-dimensional plane. Its structure size is much smaller than the wavelength of light, and it can realize complex optical functions in a compact form, significantly reducing the volume and weight of the system, and being easier to integrate into small-sized devices. However, how to combine the metasurface lens with the traditional refractive lens for combined design to achieve smaller volume is still a challenge. SUMMARY

[0005] The purpose of the present application is to provide a DMS folding super lens, a camera module and a terminal device, aiming to solve the problem of how to optimize the combined design of the metasurface lens and the traditional lens to achieve smaller volume.

[0006] To solve the above technical problems, the purpose of the present application is achieved by the following technical scheme: a DMS folding super lens is provided, which comprises a first lens, a diaphragm, a second lens, a third lens and a filter arranged in sequence along the optical axis from the object plane to the image plane; the second lens is a metasurface lens; the first lens and the third lens are resin lenses;

[0007] The DMS folding super lens satisfies: ;

[0008] Among them, D ia size of distortion of the DMS anamorphic lens, D M a size of effective region of the super surface, n 1 a refractive index of the material of the first lens, R 0 a root mean square radius of a central field of view spot, th 3 a central thickness of the third lens.

[0009] Further, the first lens is an aspherical lens with positive focal power, the object side of the first lens is convex, and the image side of the first lens is concave.

[0010] The second lens has positive focal power, the object side of the second lens is a plane, and the image side of the second lens is a binary surface; the image side of the second lens is arranged with micro-element structures.

[0011] The third lens is an aspherical lens with positive focal power, the object side of the third lens is concave, and the image side of the third lens is convex.

[0012] Further, the object side of the first lens has a positive radius of curvature, the image side of the first lens has a positive radius of curvature; the object side of the third lens has a negative radius of curvature, and the image side of the third lens has a negative radius of curvature.

[0013] Further, the total optical length of the DMS anamorphic lens satisfies the following relationship: TTL and a focal length f . .

[0014] Further, the thickness of the second lens is 0.1-0.7mm, the micro-element structures of the second lens are composed of a cylinder, a square column and a cross column, the characteristic size of the micro-element structures ranges from 80nm to 350nm, and the micro-element structures are arranged in a square lattice.

[0015] Further, the refractive index of the first lens and the third lens ranges from 1.4 to 1.7.

[0016] Further, the field of view angle of the DMS anamorphic lens satisfies: FOV ≥67°.

[0017] Further, the effective aperture of the DMS anamorphic lens satisfies: D eff ≤4.4 mm .

[0018] The embodiment of the present application also provides a camera module comprising the DMS anamorphic lens as described above.

[0019] The embodiment of the present application also provides a terminal device comprising the camera module as described above.

[0020] The embodiment of the present application has the advantages of ensuring the field of view angle and F number, reducing the TTL (total optical length), volume and cost of the lens, thereby realizing the miniaturization and light weight of the DMS folded super lens, and the DMS folded super lens can realize high-resolution imaging in a wide waveband range of 890-990 nm. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 A structural schematic diagram of the DMS folded super lens provided by the embodiment of the present application is shown in the figure.

[0023] Figure 2 A modulation curve schematic diagram of the DMS folded super lens provided by the first embodiment of the present application is shown in the figure.

[0024] Figure 3 A spot diagram of the DMS folded super lens provided by the first embodiment of the present application is shown in the figure.

[0025] Figure 4 A distortion schematic diagram of the DMS folded super lens provided by the first embodiment of the present application is shown in the figure.

[0026] Figure 5 A modulation curve schematic diagram of the DMS folded super lens provided by the second embodiment of the present application is shown in the figure.

[0027] Figure 6 A spot diagram of the DMS folded super lens provided by the second embodiment of the present application is shown in the figure.

[0028] Figure 7 A distortion schematic diagram of the DMS folded super lens provided by the second embodiment of the present application is shown in the figure.

[0029] Identification explanation in the figure:

[0030] 110, first lens; 120, diaphragm; 130, second lens; 140, third lens; 150, filter; 160, imaging surface. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are some of the embodiments of the present application but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0032] It should be understood that the terms "comprise" and "include" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0033] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0034] It should be further understood that the term "and / or" as used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0035] Please refer to Figure 1 The embodiments of the present application provide a DMS folded hyperbolic lens, which comprises a first lens 110, a diaphragm 120, a second lens 130, a third lens 140 and a filter 150 arranged in sequence along an optical axis from an object plane to an image plane; the second lens 130 is a hyperbolic surface lens; the first lens 110 and the third lens 140 are resin lenses;

[0036] The DMS folded hyperbolic lens meets: ;

[0037] Wherein, D i DMS is the distortion size of the folded hyperbolic lens, D M is the effective area size of the hyperbolic surface, n 1 is the material refractive index of the first lens 110, R 0 is the root mean square radius of the central field of view spot, th 3 is the central thickness of the third lens 140.

[0038] In the embodiment, the parameters in the above formula influence each other, and jointly determine the feasible range of the optical system; within the parameter range (0.5 to 1.5), not only the field of view angle and F number are ensured, but also the TTL (total optical length), volume and cost of the lens are reduced, so as to realize the miniaturization and light weight of the DMS folded super lens. In addition, the DMS folded super lens can realize high-resolution imaging in a wide waveband range of 890-990 nm.

[0039] In the embodiment, the first lens 110 and the third lens 140 are mainly used to provide optical power and realize partial correction of aberration; the second lens 130 has an achromatic function and can accurately compensate the chromatic aberration of the first lens 110 and the third lens 140; the optical filter 150 only allows light in the design waveband to pass through, preventing light of other wavelengths from entering and affecting the imaging effect. Under the synergistic action of the first lens 110, the second lens 130, the third lens 140 and the optical filter 150, the imaging quality of the DMS folded super lens is improved. In addition, the super surface of the second lens 130 has higher processing freedom and can further correct off-axis aberration.

[0040] In addition, the stop 120 of the embodiment is located after the first lens 110 or on the image side of the first lens 110. The design of the stop 120 helps to control the path of light passing through the lens and reduce the interference of stray light, thereby improving the imaging quality. The position of the stop 120 can be adjusted according to actual needs to achieve the best imaging effect. It can be understood that the main function of the stop 120 is to intercept and limit light. The aperture of the light beam will be different at different positions. By reasonably setting the size of the stop 120, the same effect of the stop 120 can be achieved at different positions.

[0041] In an embodiment, the first lens 110 is an aspherical lens with positive optical power, the object side of the first lens 110 is convex and has a positive radius of curvature, and the image side of the first lens 110 is concave and has a positive radius of curvature;

[0042] The second lens 130 has positive optical power, the object side of the second lens 130 is a plane, and the image side of the second lens 130 is a binary surface; the image side of the second lens 130 is arranged with micro-element structures;

[0043] The third lens 140 is an aspherical lens with positive optical power, the object side of the third lens 140 is concave and has a negative radius of curvature, and the image side of the third lens 140 is convex and has a negative radius of curvature.

[0044] In this embodiment, by combining different lenses and designing the surface shape and optical power of each lens, good imaging effect and optical performance can be achieved. Specifically, the surface shape and different curvature distribution of the object side and image side can achieve a reasonable distribution of the optical power of the lens and effectively balance aberrations such as spherical aberration, coma, and distortion.

[0045] More specifically, the positive optical power characteristic of the first lens 110 allows light to converge better when it passes through it. The convex design on its object side helps to expand the incident range of light, while the concave surface on its image side further converges and adjusts the light, effectively improving aberrations and enhancing image quality.

[0046] More specifically, the positive optical power of the second lens 130 also serves to converge light rays. Its object-side surface is planar, ensuring the stability of incident light. Its image-side surface is a binary surface with arranged micro-structures, each with a specific shape, size, and arrangement. Preferably, the thickness of the second lens 130 is 0.1-0.7 mm. The micro-structures of the second lens 130 are composed of cylindrical, square, and cross-shaped structures, with characteristic dimensions ranging from 80 nm to 350 nm. The micro-structures are arranged in a tetragonal lattice. Based on this micro-structure design, precise control of the phase, amplitude, or polarization state of the incident light wave can be achieved to reduce aberrations and dispersion, and enhance image sharpness and color reproduction.

[0047] More specifically, the positive optical power of the third lens 140 further converges the light rays. The combination of the concave surface on the object side and the convex surface on the image side optimizes the propagation path of the light rays, allowing the light rays to be focused more accurately on the imaging surface 160, thereby improving the imaging resolution.

[0048] In one embodiment, the total optical length of the DMS hyperspectral lens TTL With focal length f The relationship between them satisfies: .

[0049] In this embodiment, the ratio of the total optical length (TTL) to the focal length (f) within this range can effectively reduce aberrations and improve the clarity and quality of the image.

[0050] In one embodiment, the refractive index range of the first lens 110 and the third lens 140 is 1.4-1.7. This refractive index range can effectively balance the light refraction effect with the difficulty of lens manufacturing, ensuring that the light is deflected at an appropriate angle while reducing the cost and complexity of lens production. Furthermore, this refractive index range helps to further optimize aberration correction, allowing the light passing through the first lens 110 and the third lens 140 to be more accurately focused on the imaging plane 160, thereby improving the overall imaging performance of the DMS superconducting lens and resulting in a final image with higher contrast and richer detail.

[0051] Based on the above scheme, the field of view of the DMS folded super lens satisfies: FOV ≥67°.

[0052] Based on the above scheme, the effective aperture of the DMS folded super lens satisfies: D eff ≤4.4 mm .

[0053] Embodiment one:

[0054] The table 1 details the specific optical data parameters of each lens in a DMS folded super lens provided by the embodiment one of the present application in a feasible implementation manner, and the optical data parameters in the table 1 correspond to the DMS folded super lens shown in FIG. 1. Figure 1

[0055] Among them, the first lens 110 is a non-spherical lens with positive focal power, the object side surface is convex, and the image side surface is concave; the second lens 130 is a super surface lens, the object side surface is a plane, and the image side surface has a micro-element structure; the third lens 140 is a non-spherical lens with positive focal power, the object side surface is concave, and the image side surface is convex; the diaphragm 120 is located on the image side surface of the first lens 110. The optical parameter data of the DMS folded super lens can refer to the example in table 1:

[0056] Table 1

[0057]

[0058] In table 1, the surface number is numbered according to the surface order of each lens, for example, the surface number 1 represents the object side surface of the first lens 110, the surface number 2 represents the image side surface of the first lens 110 and the diaphragm 120, and so on, and the last surface number 9 is the imaging surface 160. Among them, “Even Asphere” represents a non-spherical surface, “Standard” represents a standard, “Binary2” represents a binary surface, and “Infinity” represents a plane; the curvature radius represents the bending degree of the lens surface, the positive value represents that the surface is bent to the image side, and the negative value represents that the surface is bent to the object side; the interval represents the center axis distance from the current surface to the next surface, the units of the curvature radius and the interval are millimeters (mm); the aperture represents the effective light diameter of the lens at each position; the refractive index represents the refractive ability of the lens material to light, the larger the refractive index, the stronger the focusing ability of the lens; the Abbe number represents the dispersion degree of the lens material to light, the larger the Abbe number, the smaller the dispersion of the lens, and the clearer the imaging;

[0059] Among them, the surface type of the first lens 110 and the third lens 140 (non-spherical lens) satisfies the following equation:

[0060] ​ ;

[0061] wherein, z represents the distance of the even aspheric surface from its vertex along the optical axis, r represents 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, and a2, a3, a4, a5, a6, a7, a8 are aspheric higher order coefficients.

[0062] wherein, for example, Table 2 details the conic coefficients of the aspheric lens surface in this embodiment in a feasible implementation manner k and the higher order coefficients a2, a3, a4, a5, a6, a7, a8:

[0063] Table 2

[0064]

[0065] In Table 2, -2.62E-01 represents the specific value of the coefficient k of the surface with the surface number 1, 3.59E-02 represents the specific value of the coefficient a2 of the surface with the surface number 1, and so on.

[0066] wherein, for example, Table 3 details the metasurface phase of the second lens 130 (i.e., the metasurface lens) in this embodiment in a feasible implementation manner

[0067] Table 3

[0068]

[0069] wherein, R1 represents the normalized radius of the binary surface of the metasurface lens, and A1 to A5 represent the coefficients of each term of the metasurface phase.

[0070] Based on the specific optical data parameters exemplified in Embodiment One; the distortion size, the effective area size of the metasurface, the material refractive index of the first lens 110, the root mean square radius of the central field of view spot, and the central thickness of the third lens 140 satisfy the relationship: , the total optical length TTL and the focal length f satisfy: ; the effective aperture satisfies: D eff =4.38 mm .

[0071] The working waveband of the DMS folding metasurface lens provided by Embodiment One is 940±50nm, and the field of view angle satisfies: Fov=67.71°, which satisfies the use requirements of the DMS system.

[0072] Figure 2 The modulation curve schematic diagram of the DMS folded super lens provided by the embodiment one of the present application, the DMS folded super lens provided by the embodiment one of the present application has high resolution, and under the index of 80 lp / mm pairs of lines per millimeter (line pairs refer to black and white lines), the field of view in the 80% area of the lens imaging range reaches MTF ≥0.4, and the central area of the lens field of view reaches MTF ≥0.75; which can meet the high-quality imaging requirements of DMS. Wherein MTF (modulation transfer function) is an important parameter for evaluating the imaging quality of the lens, and the numerical range is 0 to 1, and the closer to 1, the clearer the imaging.

[0073] Figure 3 The diffraction spot schematic diagram of the DMS folded super lens provided by the embodiment one of the present application, the DMS folded super lens provided by the embodiment one of the present application can reach 2 million pixels, and the diffraction pattern is relatively concentrated and uniformly distributed in the whole long waveband, which can meet the requirements of high-resolution imaging.

[0074] Figure 4 The distortion schematic diagram of the DMS folded super lens provided by the embodiment one of the present application, the thermal imaging lens provided by the embodiment one of the present application has small distortion and small image deformation degree, which can meet the requirements of high-quality imaging. Wherein +Y represents the field of view angle.

[0075] Embodiment two:

[0076] The table 4 details the specific optical data parameters of each lens in a DMS folded super lens provided by the embodiment two of the present application in a possible implementation manner, and the optical data parameters in the table 4 correspond to the DMS folded super lens shown in the table 4. Figure 1

[0077] Wherein, the first lens 110 is a non-spherical lens with positive focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface; the second lens 130 is a super surface lens, the object side surface thereof is a plane, and the image side surface thereof has a micro-element structure; the third lens 140 is a non-spherical lens with positive focal power, the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface; the diaphragm 120 is located on the image side surface of the first lens 110. The optical parameter data of the DMS folded super lens can refer to the example in the table 4:

[0078] Table 4

[0079]

[0080] ​In Table 4, the surface number is numbered according to the surface sequence of each lens, for example, the surface number 1 represents the object side surface of the first lens 110, the surface number 2 represents the image side surface of the first lens 110 and the diaphragm 120, and so on, and the last surface number 9 is the imaging surface 160. Among them, “Even Asphere” represents the aspherical surface, “Standard” represents the standard, “Binary2” represents the binary surface, and “Infinity” represents the plane; 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; the interval represents the center axis distance from the current surface to the next surface, and the units of the radius of curvature and the interval are millimeters (mm); the aperture represents the effective light diameter of the lens at each position; the refractive index represents the light refraction ability of the lens material, the larger the refractive index, the stronger the focusing ability of the lens; and the Abbe number represents the dispersion degree of the lens material to light, the larger the Abbe number, the smaller the dispersion of the lens, and the clearer the imaging;

[0081] wherein the surface shape of the first lens 110 and the third lens 140 (aspherical lens) satisfies the following equation:

[0082] ;

[0083] wherein, z represents the distance of the even aspherical surface from the vertex along the optical axis, r represents 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, and a2, a3, a4, a5, a6, a7, a8 are high-order coefficients of the aspherical surface.

[0084] wherein, for example, Table 5 details the conic coefficient of the surface of the aspherical lens in the embodiment in a feasible implementation manner k and the high-order coefficients a2, a3, a4, a5, a6, a7, a8:

[0085] Table 5

[0086]

[0087] In Table 5, -2.58E-01 represents the coefficient of the surface number 1 k , 3.59E-02 represents the specific indication of the coefficient a2 of the surface number 1, and so on.

[0088] wherein, for example, Table 6 details the super surface phase of the second lens 130 (i.e. the super surface lens) in the embodiment in a feasible implementation manner:

[0089] Table 6

[0090]

[0091] wherein R1 represents the normalized radius of the binary surface lens, A1 to A5 represent the coefficients of the super surface phase.

[0092] Based on the specific optical data parameters of the example shown in Embodiment Two; the distortion size, the effective area size of the super surface, the material refractive index of the first lens 110, the root mean square radius of the central field of view spot and the central thickness of the third lens 140 satisfy the relationship: , the total optical length TTL and the focal length f satisfy: ; the effective aperture satisfies: D eff =4.33 mm .

[0093] The working waveband of the DMS hyperbolic lens provided by Embodiment Two is 940±50nm, and the field of view angle satisfies: Fov =67.68°, which satisfies the use requirement of the DMS system.

[0094] Figure 5 The modulation curve diagram of the DMS hyperbolic lens provided by Embodiment Two of the present application is shown, and the DMS hyperbolic lens provided by the present application has high resolution, and in the index of 80 lp / mm pairs of lines per millimeter (line pairs refer to black and white lines), the 80% area field of view in the imaging range of the lens reaches MTF ≥0.45, and the central area field of view of the lens reaches MTF ≥0.7; which can meet the high-quality imaging requirement of the DMS. Among them MTF (modulation transfer function) is an important parameter for evaluating the imaging quality of the lens, and the numerical range is 0 to 1, and the closer to 1 indicates that the imaging is clearer.

[0095] Figure 6 The diffraction diagram of the DMS hyperbolic lens provided by Embodiment Two of the present application is shown, and the DMS hyperbolic lens provided by Embodiment Two of the present application can reach 2 million pixels, and the diffraction pattern is relatively concentrated on the entire long waveband, and is uniformly distributed, which can meet the requirement of high-resolution imaging.

[0096] Figure 7 The distortion diagram of the DMS hyperbolic lens provided by Embodiment Two of the present application is shown, and the thermal imaging lens provided by Embodiment Two of the present application has small distortion and small image deformation degree, which can meet the requirement of high-quality imaging.

[0097] In summary, the specific solutions of the first and second embodiments can satisfy the relationship shown in Table 7.

[0098] Table 7

[0099]

[0100] The DMS hyperbolic lens provided by the embodiment of the application adopts a hyperbolic hybrid technical solution, and through two traditional resin lenses and one super surface lens, the hyperbolic hybrid technical solution effectively compresses the total optical length, realizes miniaturization and lightweight design, and realizes high-resolution imaging in a wide wave band of 890-990 nm. In addition, the manufacturing process of the super surface is relatively simple, and can adopt conventional photolithography, etching, sputtering, spraying and the like, and has low cost.

[0101] The embodiment of the application further provides a camera module, which comprises the DMS hyperbolic lens.

[0102] The embodiment of the application further provides a terminal device, which comprises the camera module.

[0103] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the application, and these modifications or replacements should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A DMS anamorphic lens characterized in that, The lens includes a first lens, a diaphragm, a second lens, a third lens and a filter arranged in sequence along the optical axis from the object plane to the image plane; the second lens is a metasurface lens; the first lens and the third lens are resin lenses; The DMS anamorphic lens satisfies: ; wherein, D i DMS is the distortion size of the DMS anamorphic lens, D M E is the effective area size of the super surface, n 1 is the material refractive index of the first lens, R 0 RMS is the root mean square radius of the central field of view spot, th 3 is the central thickness of the third lens.

2. The DMS apochromatic lens of claim 1, wherein, The first lens is an aspherical lens with positive refractive power, the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; The second lens has positive refractive power, the object side of the second lens is a plane, and the image side of the second lens is a binary surface; the image side of the second lens is arranged with micro-element structures; The third lens is an aspherical lens with positive refractive power, the object side of the third lens is a concave surface, and the image side of the third lens is a convex surface.

3. The DMS apochromatic lens of claim 2, wherein, The object side of the first lens has a positive curvature radius, and the image side of the first lens has a positive curvature radius; The object side of the third lens has a negative curvature radius, and the image side of the third lens has a negative curvature radius.

4. The DMS apochromatic lens of claim 1, wherein, The total optical length of the DMS anamorphic lens TTL The relationship between focal length f satisfies: .

5. The DMS apochromatic lens of claim 2, wherein, The thickness of the second lens is 0.1-0.7mm, the micro-element structures of the second lens are composed of cylindrical, square column and cross column, the characteristic size of the micro-element structures ranges from 80nm to 350nm, and the micro-element structures are arranged in a square lattice.

6. The DMS apochromatic lens of claim 2, wherein, The refractive index of the first lens and the third lens ranges from 1.4 to 1.

7.

7. The DMS apochromatic lens of claim 2, wherein, The field angle of the DMS anamorphic lens satisfies: FOV ≥ 67°.

8. The DMS apochromatic lens of claim 2, wherein, The effective aperture of the DMS anamorphic lens satisfies: D eff ≤ 4.4 mm .

9. An image capture module, comprising: The DMS fold mirror lens comprises the DMS fold mirror lens according to any one of claims 1-8.

10. A terminal device, comprising: The camera module comprises the camera module according to claim 9.

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