camera lens

Abstract

This application discloses a camera lens, comprising: a lens group including at least one chamfered lens with optical power; an image sensor; and a substrate, the substrate having no optical power and disposed between the lens group and the image sensor. An array of phase adjustment structures is arranged on the surface of the substrate, wherein the dimensions of multiple phase adjustment structures in each phase adjustment structure array have a gradient along a linear direction. According to an embodiment of this application, light deflection can be adjusted by providing an array of phase adjustment structures with a gradient on the surface of the substrate, thereby correcting the principal ray angle of the lens group to match the principal ray angle of the image sensor.

Description

Technical Field

[0001] This application relates to the field of camera lenses, and more specifically, to a small-volume camera lens capable of correcting the angle of the principal ray. Background Technology

[0002] Reducing lens size has always been a key technical challenge in the field of camera lenses. This is especially true for mobile devices like smartphones, where thickness is a constraint, necessitating lenses that are as small as possible to align with the trend towards miniaturization.

[0003] At the same time, the requirements for image quality of camera lenses in mobile terminal devices are increasing year by year. In order to improve the image quality of the lens, more lenses are usually needed to improve the design specifications, but correspondingly, the length of the lens will inevitably increase.

[0004] Currently, due to the excessive length of lenses in mobile terminal devices, camera modules protrude from the surface of the mobile terminal devices to varying degrees, affecting the user's senses and operational comfort, and even making it difficult to place the mobile terminal devices stably horizontally on a table.

[0005] To minimize the size of camera lenses in the thickness direction of mobile devices, alternative solutions such as periscope modules, chamfered lenses, and adjustable lenses (T-lens) have begun to be used. However, while these alternatives reduce lens size, they also introduce new problems in image quality and reliability. For example, there is a difficulty in matching the principal ray angle of the lens with that of the chip. Summary of the Invention

[0006] This application provides a solution that can at least overcome or partially overcome at least one of the above-mentioned defects of the prior art.

[0007] On one hand, this application provides a camera lens that may include: a lens group including at least one chamfered lens with optical power; an image sensor; and a substrate, the substrate having no optical power and disposed between the lens group and the image sensor. An array of phase adjustment structures may be arranged on the surface of the substrate, and the dimensions of multiple phase adjustment structures in each phase adjustment structure array may have a gradient along a linear direction.

[0008] In some embodiments, the chamfered lens may have different dimensions in a first direction corresponding to the long side of the image sensor and in a second direction corresponding to the short side of the image sensor.

[0009] In some embodiments, the dimensions of the plurality of phase adjustment structures may have a gradient in a direction that does not coincide with the first and second directions.

[0010] In some embodiments, the plurality of phase adjustment structures can provide phase modulation that varies linearly according to position, thereby providing different deflection angles for incident light incident at different angles to adjust the principal ray angle of the lens group.

[0011] In some embodiments, the phase adjustment structure array is arranged in a portion of an annular region centered on the center of the substrate.

[0012] In some embodiments, the substrate may be a cover plate of the image sensor.

[0013] In some embodiments, the substrate may further include a multilayer coating structure for filtering.

[0014] In some embodiments, the refractive index of the plurality of phase-adjusting structures may be greater than the refractive index of the substrate.

[0015] In some embodiments, the dimensional gradient of the plurality of phase adjustment structures can change with the incident angle.

[0016] In some embodiments, the multiple phase adjustment structures may be kept at the same height in a direction perpendicular to the substrate.

[0017] In some embodiments, the ratio of the minimum width to the maximum width of the plurality of phase adjustment structures in a direction parallel to the substrate can be greater than 1 / 15.

[0018] In some embodiments, the plurality of phase adjustment structures may have one or more of the following: hemispherical structure, cubic structure, cylindrical structure, conical structure, and irregular irregular shape.

[0019] In some embodiments, the plurality of phase adjustment structures may be made of high-refractive-index semiconductor materials or insulating non-metallic materials.

[0020] On the other hand, this application also provides an electronic device, which includes a camera lens as described above.

[0021] According to an embodiment of this application, light deflection can be adjusted by providing a phase adjustment structure array with varying gradients on the surface of a substrate, thereby correcting the principal ray angle of the lens group to match the principal ray angle of the image sensor. Attached Figure Description

[0022] The above and other advantages of embodiments of this application will become apparent from the following detailed description with reference to the accompanying drawings, which are intended to illustrate exemplary embodiments of this application and not to limit them. In the drawings:

[0023] Figure 1 A schematic diagram of the chamfered lens structure is shown;

[0024] Figure 2 and Figure 3 Schematic diagrams of the structure of a camera lens according to an exemplary embodiment of this application are shown respectively;

[0025] Figure 4 A schematic diagram of a phase adjustment structure according to an exemplary embodiment of this application is shown;

[0026] Figure 5 The diagram illustrates the relationship between phase modulation and nanoparticle radius.

[0027] Figure 6 A schematic diagram showing the phase correction arrangement based on different deflection angles is shown;

[0028] Figure 7 An exemplary distribution of a phase adjustment structure according to an exemplary embodiment of this application is shown; and

[0029] Figure 8 Another exemplary distribution of the phase adjustment structure according to an exemplary embodiment of this application is shown. Detailed Implementation

[0030] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] It should be noted that in this specification, the terms "first," "second," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first direction discussed below may also be referred to as the second direction, and vice versa.

[0032] In the accompanying drawings, the thickness, dimensions, and shapes of the components may have been slightly exaggerated for ease of illustration. The drawings are for illustrative purposes only and are not drawn to scale. For example, the shapes of spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings.

[0033] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there may be no other elements between the element and the other element.

[0034] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used in this application for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as “above” or “above” another element would be “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both “above” and “below” orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used in this application should be interpreted accordingly.

[0035] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify all features in the list, not just individual elements. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0036] As used herein, the words “approximately,” “about,” and similar terms are used as terms indicating approximation rather than degree, and are intended to describe inherent biases in measurements or calculations that can be recognized by one of ordinary skill in the art.

[0037] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless expressly so specified herein.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Furthermore, unless explicitly limited or contradicted by the context, the specific steps included in the methods described in this application are not limited to the order in which they are described, but can be performed in any order or in parallel.

[0039] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] A camera lens may include lens groups, filters, and an image sensor. Lens groups may include multiple lenses, for example, several or even a dozen spherical or aspherical lenses with optical power. Filters typically do not have optical power and can be used to filter out certain wavelengths of light so that the lens operates in the desired wavelength range. For example, filters may be infrared filters, visible light filters, bandpass filters, cutoff filters, short-pass filters, long-pass filters, etc.

[0041] Taking into account factors such as manufacturing difficulty, lenses typically have a circular shape in the XY plane, making their area larger than that of a rectangular image sensor. If we add the non-optical effective diameter portion and structural components like the lens barrel, the area occupied by the lens in the XY plane becomes significantly larger than that of the image sensor. Furthermore, in the lens's axial direction (Z-direction), the length of the lens itself is difficult to shorten due to factors such as the thickness of the lens elements, the gaps between lens elements, and the back focal length (i.e., the distance from the lens or filter closest to the image sensor to the image sensor).

[0042] To reduce the size of the lens in the XY plane, methods such as... Figure 1 The illustrated scheme involves chamfered lenses. For example, a circular lens is cut into a rectangle according to the size of the image sensor, or the lens is directly injection molded into a rectangular shape. However, chamfered lenses can cause asymmetry in the X and Y directions when correcting the image. For example, because the shorter side in the Y direction is shorter than the longer side in the X direction, no image is formed in the Y direction for edge-incident rays, while image correction is still required in the X direction.

[0043] The Chief Ray Angle (CRA) is the required angle of incidence for an image sensor to ensure optimal light sensitivity. When the angle of incidence is not 0°, some light rays will be blocked and unable to reach the pixels. For camera lenses, not only must the lens's CRA not exceed a certain threshold, but it must also match the sensor's CRA. If the lens's CRA is smaller than the sensor's CRA, the edges will appear darker because light cannot reach the pixel edges. If the lens's CRA is larger than the sensor's CRA, light will refract to neighboring pixels, causing crosstalk and color cast in the image. This is especially noticeable around the edges of the image because the CRA curves upwards from the image center to the edges, gradually increasing in size. Therefore, the lens's CRA is typically required to differ from the sensor's CRA by within ±2° to ensure optimal light sensitivity and image quality.

[0044] To reduce the size of the lens in the Z-axis, the overall length of the lens is strictly limited during lens design, and the back focal length needs to be compressed as much as possible to save space. As the lens length becomes shorter, the angle at which light reaches the sensor pixel location becomes larger. With a larger angle at the pixel location, some light rays will not be able to focus on the pixel, resulting in light loss and reduced pixel response. Therefore, the limitation on the overall lens length makes the matching problem between the lens's CRA and the image sensor's CRA more severe. In other words, with shorter lens length and back focal length, the error between the lens's CRA and the sensor's CRA becomes more significant, making CRA correction even more crucial. Thus, while small lenses, such as chamfered lenses, can save space as much as possible, the resulting asymmetry and image quality issues require new mechanisms to address.

[0045] Figure 2 and Figure 3 A schematic diagram of the structure of a camera lens 100 according to an embodiment of this application is shown.

[0046] The camera lens 100 may include a lens group 110, a substrate 120, and an image sensor 130. The lens group 110 may include multiple spherical or aspherical lenses with optical power. The aspherical lenses may include rotationally symmetric aspherical lenses and non-rotationally symmetric aspherical lenses. In an example, the lens group 110 may include a first lens 111 and a second lens 112, but this application is not limited thereto. The lens group 110 may include more lenses. Both the first lens 111 and the second lens 112 may be chamfered lenses, that is, the dimensions of the first lens 111 and the second lens 112 in the Y direction (second direction) may be smaller than their dimensions in the X direction (first direction). In an exemplary embodiment, the X direction may be the long side direction of the image sensor 130, and the Y direction may be the short side direction of the image sensor 130.

[0047] The substrate 120 can be an optical element without optical power, such as a filter or a sensor cover. An array of phase adjustment structures can be disposed on the surface of the substrate 120. Each phase adjustment structure array includes multiple phase adjustment structures 121, the dimensions of which can vary along a linear direction, as will be described in detail below. The phase adjustment structures 121 can deflect light, thereby adjusting the CRA of the lens assembly 110 to match the CRA of the image sensor 130. The phase adjustment structures 121 are also referred to as two-dimensional nanoparticles or nanostructures.

[0048] In some embodiments, the substrate 120 may be a cover plate of the image sensor 130 and may include a multilayer coating structure for filtering.

[0049] The image sensor 130 can be a CCD or CMOS sensor, which is used to convert the received light signal into an electrical signal.

[0050] According to Fermat's principle, light travels along the actual path where the optical path is minimized. Let the total optical path of light along the actual propagation path between points A and B be... Let n(r) be the refractive index distribution along the propagation path r. Then, the total optical path can be expressed in phase form as follows: k0 is the vacuum wavenumber. If the interface between two media through which light propagates introduces Φ(r) to the light wave... s The phase jump of ) is the position vector r on the interface. s If the function is given, then the total phase corresponding to the actual propagation path of the light wave at points A and B is:

[0051]

[0052] In the two-dimensional case, assuming the light wave originates from a source with a refractive index of n... i The medium incident on the refractive index n t In the medium, we can conclude that:

[0053]

[0054] The above equation is the generalized law of refraction. Compared to Snell's formula, the above equation introduces... The term dφ / dx in this term is the phase gradient along the interface direction on the plane defined by the incident and outgoing light.

[0055] According to Equation 2, the classical Snell formula is only a special case of the generalized law of refraction under the condition that the phase gradient is zero. If a suitable phase gradient is introduced into the incident light at the interface, the outgoing light can be refracted in any direction. That is to say, the direction of light refraction can be controlled by controlling the phase gradient at the interface, and the phase gradient interface is equivalent to introducing a non-uniformly distributed phase jump into the incident light field at the interface.

[0056] As mentioned above, using chamfered lens elements introduces asymmetry; that is, corrections for light refraction are only needed in the X or Y direction, without requiring corrections in the other direction. Furthermore, reducing the lens's size in the Z direction exacerbates the mismatch between the lens's CRA and the image sensor's CRA.

[0057] When errors occur in the CRA (Current Aspect Ratio) at certain incident angles, corrections can be made by introducing additional light deflection. For example, light deflection can be adjusted by providing a phase adjustment structure 121 on the substrate 120, thereby correcting the CRA of the lens group 110 to match the CRA of the image sensor 130. In an exemplary embodiment, CRA adjustment can be performed only for the partially mismatched incident angles obtained from comparing the CRAs of the image sensor 130 and the lens group 110.

[0058] The phase adjustment structure 121 according to the exemplary embodiment of this application can increase the deflection angle of light rays L1 and L2, such as Figure 2 As shown. Furthermore, the phase adjustment structure 121 can also reduce the deflection angle of the light ray L3, such as... Figure 3 As shown. In other words, the phase adjustment structure 121 can increase or decrease the CRA of the lens group 110, thereby achieving adjustment or correction of the CRA of the lens group 110.

[0059] In order to achieve such Figure 2 or Figure 3 As shown, the light deflection requires an array of phase adjustment structures 121 to provide a gradient of phase change to increase or decrease the CRA. This gradient of phase change can be achieved by varying the size of the phase adjustment structures. Because the refractive index of the phase adjustment structures 121 differs from that of the surrounding medium (air or substrate), as the size of the phase adjustment structures 121 increases, its equivalent refractive index also increases, thus applying different phase modulations to the incident light.

[0060] In some exemplary embodiments, the dimensions of the plurality of phase adjustment structures in each phase adjustment structure array may have a gradient along a linear direction. For example, in each phase adjustment structure array, the size of each phase adjustment structure may increase as the distance of the phase adjustment structure from the center of the substrate increases. Alternatively, in each phase adjustment structure array, the size of each phase adjustment structure may first increase as the distance of the phase adjustment structure from the center of the substrate increases, and then decrease as the distance of the phase adjustment structure from the center of the substrate increases. In exemplary embodiments, the dimensions of the plurality of phase adjustment structures in each phase adjustment structure array may have a gradient along a radial direction centered on the center of the substrate.

[0061] Figure 4 A schematic diagram of a phase adjustment structure 121 according to an exemplary embodiment of this application is shown. Figure 5 The diagram schematically illustrates the relationship between the radius of the phase modulation and the phase adjustment structure 121. Figure 6 A schematic diagram showing the phase correction arrangement based on different deflection angles is shown.

[0062] In an exemplary embodiment, the phase adjustment structure 121 may be a TiO2 columnar nanostructure. The height H of the nanostructure may vary in the range of 900 nm to 1100 nm, and specifically may be 1000 nm, and the radius R may vary in the range of 100 nm to 300 nm.

[0063] For incident light at a wavelength of 940 nm, curves relating phase change to the volumetric spatial proportion of the nanostructure can be established using methods well-known to those skilled in the art, such as strictly coupled wave-wave (RCWA), finite-difference time-domain (FDTD), or finite element method (FEM). Based on these curves, corresponding nanostructures can be selected and arranged according to the desired phase, thereby achieving any desired phase distribution. Figure 5 It is evident that this change in spatial volume ratio is sufficient to achieve arbitrary phase changes within the range of 0-2π. By constructing such nanoparticles into an array and making the nanoparticles at different locations have different sizes to provide different phase modulations, selective deflection of incident light can be achieved.

[0064] For example, formulas can be used (Formula 3) is used to estimate the required phase correction at different radial positions d, and based on, as shown in the formula... Figure 5 The curves shown correspond to nanostructures of different sizes, where λ is the wavelength and θ is the deflection angle required to correct chromatic aberration.

[0065] like Figure 6As shown, different phase corrections, i.e., different nanoparticle size variation gradients, can be arranged according to different deflection angles. For some deflection angles in the example, the radius of the nanostructure at different positions d can be obtained.

[0066] Table 1 below shows the radii of the nanostructures at different radial positions d for different deflection angles.

[0067] θ = 3° θ = 7° θ = 10° θ = 15° d / nm radius / nm radius / nm radius / nm radius / nm 700 81 100 81 119 1400 96 119 96 136 2100 106 127 106 149 2800 113 134 113 168 3500 119 141 119 205 4200 124 147 124 115 4900 128 153 128 134 … … … … …

[0068] Table 1

[0069] Figure 7 and Figure 8 Exemplary distributions of the phase adjustment structure 121 according to exemplary embodiments of this application are shown. Figure 7 and Figure 8 The dashed boxes in the diagram represent the areas projected onto the substrate 120 by the lens. For example, the inner dashed box can represent the area of ​​the inner field of view, while the outer dashed box can represent the area of ​​the outer field of view.

[0070] like Figure 7 As shown, the array of phase adjustment structures 121 can be arranged along the Y direction and can be positioned outside the inner dashed box. In another example, as... Figure 8 As shown, the array of phase adjustment structures 121 can be arranged circumferentially with the center of the substrate 120 as the center, and can be arranged between the inner dashed frame and the outer dashed frame. In other words, the phase adjustment structure array is arranged in a portion of a circular region centered on the center of the substrate.

[0071] Because the chamfered lens is no longer symmetrical in the X and Y directions, incident rays in the external field of view (i.e., incident rays with larger incident angles) may only enter the sensor for imaging in certain directions. For example, Figure 8 As shown, CRA correction for larger incident angles (outer field of view) may only require correction in certain directions, i.e., only within a portion of the field of view. In this case, the distribution of the nanoparticle array may correspond only to the portion of the sensor corresponding to that incident angle. The direction of the nanoparticle distribution (the direction of distance d from the center) can be radial to a circle centered on the substrate (or sensor), thus necessarily including regions not distributed in the X or Y directions.

[0072] Generally speaking, the maximum CRA of a lens corresponds to the maximum angle of incidence, which corresponds to the maximum required angle of deflection correction, while the minimum CRA of a lens corresponds to the minimum angle of incidence, which corresponds to the minimum required angle of deflection correction.

[0073] In areas with smaller incident angles (inner field of view), if CRA correction is not required, there is no need to arrange a nanostructure array. Alternatively, a nanostructure array can be arranged in the inner field of view to appropriately increase the CRA, which can help shorten the lens's back focal length.

[0074] Although the array of phase-adjusting structures is called a nanostructure array, the nanostructures do not necessarily need to have a fixed spacing. For the sake of simplifying the design process, the spacing between nanostructures can be made uniform. However, in some implementations, the spacing between nanostructures can be differentiated to reduce diffraction effects.

[0075] The height of the nanostructure in the direction perpendicular to the substrate can range from 200 to 2000 nanometers, and this height remains consistent. Furthermore, the maximum width (or diameter) of the nanostructure in the direction parallel to the substrate can range from 100 to 1000 nanometers, and the ratio of the minimum width to the maximum height can be greater than 1 / 15. A minimum width to maximum height ratio of 1 / 15 helps to meet the required phase adjustment amplitude while facilitating fabrication.

[0076] For the deflection of broadband light, nanoparticles corresponding to representative wavelengths (such as 5 or 10 wavelengths with higher weights) can be included in the array. As shown in Equation 3, nanoparticles corresponding to one wavelength cannot produce the same phase modulation for deflection of another wavelength, thus preventing mutual interference.

[0077] When the refractive index of the nanostructure is greater than that of the substrate, the nanostructure can adjust or correct the CRA (Credit Ratio). Therefore, the nanostructure can be made of various high-refractive-index semiconductor materials or insulating non-metallic materials, such as silicon, germanium, silicon nitride, gallium arsenide, and gallium phosphide, but this application is not limited to these. High-dissipation metal materials should be avoided in the nanostructure.

[0078] The principle of phase modulation of nanostructures is based on the change in equivalent refractive index with the volume occupied by the space. Therefore, when a phase change curve can be established based on the change in the spatial volume of the nanostructure, the nanostructure can have various shapes. For example, the nanostructure can be hemispherical, cubic, cylindrical, conical, or irregularly shaped, but this application is not limited to these.

[0079] When applying the nanostructure phase modulation scheme to other lenses where the chromatic aberration bottleneck occurs at different fields of view or wavelengths, the position of the nanostructure array on the lens or filter, as well as the size of each nanostructure, can be changed as needed.

[0080] The fabrication of nanostructure arrays can utilize common micro / nano fabrication techniques such as nanoimprinting, photolithography, electron beam etching, 3D printing, and laser direct writing. In some exemplary embodiments, conventional antireflective or protective films can be further coated onto the nanostructure array to reduce reflection or protect against the intrusion of external substances.

[0081] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. Camera lens, including: A lens group, including at least one slit lens with optical power; Image sensor; as well as A substrate, which has no optical power, is disposed between the lens group and the image sensor. The feature is that a phase adjustment structure array is arranged on the surface of the substrate, and the dimensions of multiple phase adjustment structures in each phase adjustment structure array have a gradient along a linear direction; Wherein, the size of the chamfered lens in the first direction corresponding to the long side of the image sensor is greater than the size of the chamfered lens in the second direction corresponding to the short side of the image sensor, and the incident light in the outer field of view of the substrate is imaged in the first direction but not in the second direction; The phase adjustment structure array is arranged along the first direction outside the inner field of view region of the substrate; or, the phase adjustment structure array is arranged along the first direction in a portion of an annular region centered on the center of the substrate, the annular region being located in the outer field of view region outside the inner field of view region. The phase adjustment structure array is used to adjust the deflection angle of the incident light in the outer field of view, thereby correcting the principal ray angle of the lens group so that the principal ray angle of the lens group matches the principal ray angle of the image sensor.

2. The camera lens according to claim 1, characterized in that, The dimensions of the plurality of phase adjustment structures have a gradient in a direction that does not coincide with the first and second directions.

3. The camera lens according to claim 1, characterized in that, The multiple phase adjustment structures provide phase modulation that varies linearly according to position, thereby providing different deflection angles for incident light incident at different angles to adjust the principal ray angle of the lens group.

4. The camera lens according to claim 1, characterized in that, The substrate is the cover plate of the image sensor.

5. The camera lens according to claim 1, characterized in that, The substrate also includes a multilayer coating structure for filtering.

6. The camera lens according to claim 1, characterized in that, The refractive index of the plurality of phase-adjusting structures is greater than that of the substrate.

7. The camera lens according to claim 1, characterized in that, The dimensional gradient of the multiple phase adjustment structures changes with the incident angle.

8. The camera lens according to claim 1, characterized in that, The plurality of phase adjustment structures maintain a consistent height in the direction perpendicular to the substrate.

9. The camera lens according to claim 1, characterized in that, The ratio of the minimum width to the maximum width of the plurality of phase adjustment structures in the direction parallel to the substrate is greater than 1 / 15.

10. The camera lens according to claim 1, characterized in that, The plurality of phase adjustment structures have one or more of the following: hemispherical structure, cubic structure, cylindrical structure, conical structure, and irregular irregular shape structure.

11. The camera lens according to claim 1, characterized in that, The multiple phase adjustment structures are made of high-refractive-index semiconductor materials or insulating non-metallic materials.

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