Folding and super hybrid visible light pick-up lens and electronic equipment

Abstract

The invention relates to a refractive and super hybrid visible light pick-up lens and electronic equipment, and belongs to the field of optical lenses, the refractive and super hybrid visible light pick-up lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis, and the other lenses are aspheric lenses. According to the invention, the large aperture and low distortion are realized through the eight-piece design, the total optical length is effectively compressed, the system is more miniaturized, lighter and thinner, and the surface type complexity of the aspherical lenses is reduced.

Description

Technical Field

[0001] This invention belongs to the field of optical lenses, and specifically relates to a hybrid visible light camera lens and electronic device. Background Technology

[0002] With the development of technology and the improvement of people's living standards, the performance of electronic image sensors has been greatly improved, and the demand for camera lenses is also increasing.

[0003] Current camera lenses often employ combinations of aspherical plastic lenses, achieving high-resolution imaging through the combination of high-order aspherical surface shapes. However, due to limitations in manufacturing processes and yield rates, the shape of aspherical surfaces has many constraints. Summary of the Invention

[0004] This application provides a hybrid visible light camera lens and electronic device to at least solve the above-mentioned technical problems existing in the prior art.

[0005] One embodiment of this application provides a hybrid visible light camera lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein at least one lens is a metasurface lens, and the remaining lenses are aspherical lenses; The lens satisfies: Where Fno is the aperture number, Imgh is the diagonal size of the imaging target surface, FOV is the diagonal field of view, TTL is the total length of the optical system, defined as the distance from the center of the optical axis on the object side of the first lens to the image plane, and f is the focal length.

[0006] In one embodiment, the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object plane to the image plane; the fourth lens is a metasurface lens, and the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all aspherical lenses.

[0007] In one embodiment, the first lens is a lens with negative optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave; the second lens is a lens with positive optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is convex; the third lens is a lens with negative optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave; the fourth lens is a metasurface lens with positive optical power, its object-side and image-side surfaces having microstructures arranged... The fifth lens is a lens with positive optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is convex / concave; the sixth lens is a lens with negative optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave; the seventh lens is a lens with positive optical power, its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is concave; the eighth lens is a lens with negative optical power, its object-side surface near the optical axis is concave, and its image-side surface near the optical axis is concave.

[0008] In one embodiment, the fourth lens is made of glass.

[0009] In one possible implementation, the focal length of the lens satisfies: .

[0010] In one possible implementation, the aperture number of the lens satisfies .

[0011] In one possible implementation, the field of view of the lens satisfies .

[0012] In one possible implementation, an aperture is also included.

[0013] In one possible implementation, a color filter is also included.

[0014] Another aspect of this application provides an electronic device, including any of the above-described superconducting visible light camera lenses.

[0015] Compared with the prior art, this application has the following advantages: This application employs a hybrid refractive-superlens technology solution, achieving a large aperture and low distortion through an eight-element design (seven traditional plastic lenses + one superlens). This solution effectively compresses the overall optical length, making the system smaller, thinner, and reducing the surface complexity of the aspherical lenses. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the superconducting visible light camera lens in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the MTF of the superconducting visible light camera lens in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the diffusion spot of the superconducting visible light camera lens in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the distortion of the superconducting visible light camera lens in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the structure of the superconducting visible light camera lens in Embodiment 2 of this application; Figure 6 This is a schematic diagram of the MTF of the superconducting visible light camera lens in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the diffusion spot of the superconducting visible light camera lens in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the distortion of the superconducting visible light camera lens in Embodiment 2 of this application; Explanation of reference numerals in the attached figures: 100, Aperture stop; 110, First lens; 120, Second lens; 130, Third lens; 140, Fourth lens; 150, Fifth lens; 160, Sixth lens; 170, Seventh lens; 180, Eighth lens; 190, Imaging plane; 200, Color filter. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] 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.

[0019] This invention discloses a hybrid visible light camera lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein at least one lens is a metasurface lens, and the remaining lenses are aspherical lenses; The lens satisfies: Where Fno is the aperture number, Imgh is the diagonal size of the imaging target surface, FOV is the diagonal field of view, TTL is the total length of the optical system, defined as the distance from the center of the optical axis on the object side of the first lens to the image plane, and f is the focal length.

[0020] This application employs a hybrid refractive-superlens technology solution, combining a superlens and a traditional aspherical lens to construct an eight-element design (seven traditional plastic lenses + one superlens) hybrid refractive-superlens system, achieving a large aperture and low distortion. Simultaneously, this solution effectively compresses the overall optical length, making the system smaller, thinner, and lighter, while also reducing the surface complexity of the aspherical lenses.

[0021] In one embodiment, the superconducting visible light camera lens includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180 arranged sequentially along the optical axis from the object plane to the image plane.

[0022] Among them, at least one of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170 and the eighth lens 180 is a metasurface lens, and the remaining lenses are aspherical lenses.

[0023] Specifically, non-metasurface lenses are made of plastic materials, such as EP4000, EP5000, EP6000, EP7000, OKP4, APL5514, APL5014, etc., while metasurface lenses are made of glass, such as Silica, D263TECO, etc.

[0024] In this embodiment, the metasurface lens consists of a substrate and microstructures disposed on the substrate. These microstructures are composed of subwavelength-scale micro / nano unit arrays, each with a specific shape, size, and arrangement to achieve precise control over the phase, amplitude, or polarization state of the incident light wave. Through the design of the microstructures, the metasurface lens can achieve optical performance comparable to or even superior to traditional lenses while maintaining a slim and lightweight profile, such as high transmittance, low chromatic aberration, and low distortion. The period of the micro / nano structure of the metasurface lens ranges from 250 to 400 nm, with an optimal period of 350 nm in this embodiment; the height of the micro / nano structure ranges from 600 to 1300 nm, with an optimal height of 1000 nm in this embodiment; and the diameter of the micro / nano structure covers 100 to 250 nm, arranged in square, hexagonal, or other shapes.

[0025] In some preferred embodiments, the fourth lens 140 is a metasurface lens, and the first lens 110, the second lens 120, the third lens 130, the fifth lens 150, the sixth lens 160, the seventh lens 170 and the eighth lens 180 are all aspherical lenses.

[0026] In one embodiment, the first lens 110 is a lens with negative optical power, wherein the object-side surface near the optical axis is convex and the image-side surface near the optical axis is concave; both the object-side surface and the image-side surface of the first lens 110 are aspherical. The second lens 120 is a lens with positive optical power, with a convex surface near the optical axis on its object side and a convex surface near the optical axis on its image side; both the object side and the image side of the second lens 120 are aspherical. The third lens 130 is a lens with negative optical power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both the object-side surface and the image-side surface of the third lens 130 are aspherical. The fourth lens 140 is a metasurface lens with positive optical power, and its object side and image side have microstructure arrangement. The fifth lens 150 is a lens with positive optical power. Its object-side surface near the optical axis is convex, and its image-side surface near the optical axis is convex / concave. Both the object-side surface and the image-side surface of the fifth lens 150 are aspherical. The sixth lens 160 is a lens with negative optical power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both the object-side surface and the image-side surface of the sixth lens 160 are aspherical. The seventh lens 170 is a lens with positive optical power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both the object-side surface and the image-side surface of the seventh lens 170 are aspherical. The eighth lens 180 is a lens with negative optical power. Its object-side surface near the optical axis is concave, and its image-side surface near the optical axis is also concave. Both the object-side surface and the image-side surface of the eighth lens 180 are aspherical.

[0027] In one embodiment, the hybrid lens further includes an aperture stop 100, which can be positioned between any two lenses, before the first lens 110, or after the eighth lens 180. Preferably, the aperture stop 100 is positioned between the second lens 120 and the third lens 130.

[0028] In one embodiment, the hybrid refractive lens further includes a color filter 200, which may be disposed before the first lens 110 or after the eighth lens 180. Preferably, the color filter 200 is disposed between the eighth lens 180 and the image plane 190.

[0029] like Figure 1 As shown, the incident light enters from the object side of the first lens 110, and then passes through the second lens 120, the aperture 100, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the seventh lens 170, and the eighth lens 180 in sequence, finally converging on the imaging plane 190. Example

[0030] For example, Table 1 details the specific optical data parameters of each lens in the hybrid visible light camera lens provided in the embodiments of the present invention, using a feasible implementation method. The optical data parameters in Table 1 correspond to... Figure 1 The image shows a super-high-resolution visible light camera lens.

[0031] In this embodiment, the superconducting visible light camera lens is provided with a first lens 110, a second lens 120, an aperture 100, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170 and an eighth lens 180 in sequence along the optical axis from the object plane to the image plane.

[0032] Among them, the first lens 110 is an aspherical lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side; The second lens 120 is an aspherical lens with positive optical power, and its object side surface near the optical axis is convex, and its image side surface near the optical axis is also convex. The third lens 130 is an aspherical lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side; The fourth lens 140 is a metasurface lens with positive optical power, and its object side and image side have microstructure arrangement. The fifth lens 150 is an aspherical lens with positive optical power, and its object side surface near the optical axis is convex, as is its image side surface near the optical axis. The sixth lens 160 is an aspherical lens with negative optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis. The seventh lens 170 is an aspherical lens with positive optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis. The eighth lens 180 is an aspherical lens with negative optical power, with its object side and image side both being concave near the optical axis. Table 1

[0033] The surface numbers are assigned according to the order of the lenses. For example, surface number 1 represents the object side of the first lens 110, surface number 2 represents the image side of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface near the optical axis; a positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. "Infinity" indicates that the surface is flat. The spacing represents the axial distance between the current surface and the next surface. Both the radius of curvature and the spacing are in millimeters (mm). The values ​​in the "Material" column represent the refractive index of the corresponding lens material.

[0034] Even-order aspherical surfaces satisfy the following equations: Where z is the distance from the even-order aspherical surface to its vertex along the optical axis, r is the height from the optical axis, c is the curvature, c=1 / R, and R is the radius of curvature at the vertex of the lens; N is the number of polynomial coefficients in the series, k is the conic coefficient, and ai is the coefficient of the higher-order aspherical term.

[0035] For example, Table 2 details the conic coefficient k and higher-order coefficient ai of the aspherical lens surface in this embodiment with a feasible implementation.

[0036] Table 2

[0037] The phase of a binary surface is added by the following polynomial expansion: Where N is the number of polynomial coefficients in the series, Ai is the square coefficient of ρ, ρ is the normalized radial aperture coordinate, and M is the diffraction order.

[0038] For example, Table 3 details the binary surface coefficients of the metasurface lens in this embodiment with a feasible implementation method.

[0039] Table 3

[0040] Where R1 is the normalized radius of the binary surface.

[0041] In this embodiment, the aperture number, target size, and total system length satisfy the following relationship: The overall length, field of view, and focal length of the optical lens satisfy the following conditions: ; The hybrid visible light camera lens provided in this embodiment operates in the wavelength range of 430~650nm, has an aperture of f / 2.38, a focal length of 6.0mm, a total length of 7mm, a target surface size of 11.0mm, and a maximum field of view of 84°, thus meeting the requirements for camera lens use.

[0042] Figure 2 This is a schematic diagram of the modulation transfer function (MTF) of the superconducting visible light camera lens provided in an embodiment of the present invention. The superconducting visible light camera lens provided in this embodiment of the present invention has an MTF value ≥ 0.35 at 160 lp / mm, which can be matched with conventional camera chips and meet the requirements of high-resolution imaging.

[0043] Figure 3 This is a schematic diagram of the diffusion pattern of the refractive-superconducting visible light camera lens provided in an embodiment of the present invention. The refractive-superconducting visible light camera lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed diffusion pattern across the entire wavelength band, which can meet the requirements of high-resolution imaging.

[0044] Figure 4 This is a distortion diagram of a hybrid visible light camera lens provided in an embodiment of the present invention, which represents the distortion values ​​corresponding to different fields of view, such as... Figure 4 As shown, the superconducting visible light camera lens provided in this embodiment of the invention has a distortion of less than 3.5% across the entire field of view in the working band, and the overall distortion is small. Example

[0046] For example, Table 4 details the specific optical data parameters of each lens in the hybrid visible light camera lens provided in the embodiments of the present invention, according to a feasible implementation. The optical data parameters in Table 4 correspond to... Figure 5 The image shows a super-high-resolution visible light camera lens.

[0047] In this embodiment, the superconducting visible light camera lens is provided with a first lens 110, a second lens 120, an aperture 100, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, and a color filter 190 in sequence along the optical axis from the object plane to the image plane.

[0048] Among them, the first lens 110 is an aspherical lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side; The second lens 120 is an aspherical lens with positive optical power, and its object side surface near the optical axis is convex, and its image side surface near the optical axis is also convex. The third lens 130 is an aspherical lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side; The fourth lens 140 is a metasurface lens with positive optical power, and its object side and image side have microstructure arrangement. The fifth lens 150 is an aspherical lens with positive optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis. The sixth lens 160 is an aspherical lens with negative optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis. The seventh lens 170 is an aspherical lens with positive optical power. Its object side is convex near the optical axis, and its image side is concave near the optical axis. The eighth lens 180 is an aspherical lens with negative optical power. Its object side is concave near the optical axis, and its image side is also concave near the optical axis.

[0049] Table 4

[0050] The surface numbers are assigned according to the order of the lenses. For example, surface number 1 represents the object side of the first lens 110, surface number 2 represents the image side of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface near the optical axis; a positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. "Infinity" indicates that the surface is flat. The spacing represents the axial distance between the current surface and the next surface. Both the radius of curvature and the spacing are in millimeters (mm). The values ​​in the "Material" column represent the refractive index of the corresponding lens material.

[0051] Even-order aspherical surfaces satisfy the following equations: Where z is the distance from the even-order aspherical surface to its vertex along the optical axis, r is the height from the optical axis, c is the curvature, c=1 / R, and R is the radius of curvature at the vertex of the lens; N is the number of polynomial coefficients in the series, k is the conic coefficient, and ai is the coefficient of the higher-order aspherical term.

[0052] For example, Table 5 details the conic coefficient k and higher-order coefficient ai of the aspherical lens surface in this embodiment with a feasible implementation.

[0053] Table 5

[0054] The phase of a binary surface is added by the following polynomial expansion: Where N is the number of polynomial coefficients in the series, Ai is the square coefficient of ρ, ρ is the normalized radial aperture coordinate, and M is the diffraction order.

[0055] For example, Table 6 details the binary surface coefficients of the metasurface transparency in this embodiment with a feasible implementation.

[0056] Table 6

[0057] Where R1 is the normalized radius of the binary surface.

[0058] In this embodiment, the aperture number, target size, and total system length satisfy the following relationship: The overall length, field of view, and focal length of the optical lens satisfy the following conditions: .

[0059] The hybrid visible light camera lens provided in this embodiment operates in the wavelength range of 430~650nm, has an aperture of 1.65, a focal length of 6.3mm, a total length of 8.1mm, a target surface size of 11.0mm, and a maximum field of view of 80°, thus meeting the requirements for camera lens use.

[0060] Figure 6 This is a schematic diagram of the modulation transfer function (MTF) of the superconducting visible light camera lens provided in an embodiment of the present invention. The superconducting visible light camera lens provided in this embodiment of the present invention has an MTF value ≥ 0.4 at 160 lp / mm, which can be matched with conventional camera chips and meet the requirements of high-resolution imaging.

[0061] Figure 7 This is a schematic diagram of the diffusion pattern of the refractive-superconducting visible light camera lens provided in an embodiment of the present invention. The refractive-superconducting visible light camera lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed diffusion pattern across the entire wavelength band, which can meet the requirements of high-resolution imaging.

[0062] Figure 8 This is a distortion diagram of a hybrid visible light camera lens provided in an embodiment of the present invention, which represents the distortion values ​​corresponding to different fields of view, such as... Figure 8 As shown, the superconducting visible light camera lens provided in this embodiment of the invention has a distortion of less than 3% across the entire field of view in the working band, and the overall distortion is small.

[0063] Example 1 and Example 2 respectively satisfy the relationships shown in Table 7 below: Table 7

[0064] This invention also discloses an electronic device, including any of the above-mentioned superconducting visible light camera lenses.

[0065] 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 visible light camera lens, characterized in that, Along the optical axis from the object plane to the image plane, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, wherein at least one lens is a metasurface lens, and the remaining lenses are aspherical lenses; The lens satisfies: Where Fno is the aperture number, Imgh is the diagonal size of the imaging target surface, FOV is the diagonal field of view, TTL is the total length of the optical system, defined as the distance from the center of the optical axis on the object side of the first lens to the image plane, and f is the focal length.

2. The hybrid visible light camera lens according to claim 1, characterized in that, The lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object plane to the image plane; The fourth lens is a metasurface lens, and the first, second, third, fifth, sixth, seventh, and eighth lenses are all aspherical lenses.

3. A hybrid visible light camera lens according to claim 2, characterized in that: The first lens is a lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side; The second lens is a lens with positive optical power, and its object side is convex near the optical axis, and its image side is convex near the optical axis. The third lens is a lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side. The fourth lens is a metasurface lens with positive optical power, and its object side and image side have microstructure arrangements. The fifth lens is a lens with positive optical power, with a convex surface near the optical axis on the object side and a convex / concave surface near the optical axis on the image side. The sixth lens is a lens with negative optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side. The seventh lens is a lens with positive optical power, with a convex surface near the optical axis on the object side and a concave surface near the optical axis on the image side. The eighth lens is a lens with negative optical power, with a concave surface near the optical axis on the object side and a concave surface near the optical axis on the image side.

4. A hybrid visible light camera lens according to claim 2, characterized in that: The fourth lens is made of glass.

5. A hybrid visible light camera lens according to claim 1, characterized in that, The focal length of the lens satisfies: .

6. A hybrid visible light camera lens according to claim 1, characterized in that, The aperture number of the lens satisfies .

7. A hybrid visible light camera lens according to claim 1, characterized in that: The field of view of the lens satisfies .

8. A hybrid visible light camera lens according to claim 1, characterized in that: It also includes the aperture.

9. A hybrid visible light camera lens according to claim 1, characterized in that: It also includes color filters.

10. An electronic device, characterized in that: Includes any one of the superconducting visible light camera lenses according to claims 1-9.

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