Ultra-micro-distance long-focus camera module

Abstract

The invention discloses an ultra-micro-distance long-focus camera module. The ultra-micro-distance long-focus camera module comprises at least two lens assemblies, a turn-back prism and a chip imaging assembly, the turn-back prism comprises a light inlet side and a light outlet side, and the turn-back prism is arranged in front of the imaging surface of the chip imaging assembly; at least one of the at least two lens assemblies comprises a super lens, and at least one of the object side surface and the image side surface of the super lens is provided with a micro-nano structure; at least one of the at least two lens assemblies is arranged in front of the light inlet side of the turn-back prism, and at least one of the at least two lens assemblies is arranged behind the light outlet side of the turn-back prism and in front of the imaging surface of the chip imaging assembly, or the at least two lens assemblies are both arranged in front of the light inlet side of the turn-back prism. The ultra-micro-distance long-focus camera module provided by the invention can meet the requirement of miniaturization.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an ultra-macro telephoto camera module. Background Art

[0002] With the rapid development of mobile communication technology and the popularization of smartphones, the functions and application scenarios of mobile phone cameras are constantly enriching and expanding. Among them, telephoto cameras, as a functional module that enables long-distance shooting and optical zoom, have attracted widespread attention in the smartphone market.

[0003] However, to capture distance and quality images, telephoto cameras require a long focal length and a large aperture. This necessitates a sufficiently large size, creating a trade-off between size, macro range, and zoom ratio. This creates a struggle between performance and size, making miniaturization difficult. Existing technologies that fold the optical path through a prism to increase the optical range have achieved significant success in recent years, but these same trade-offs persist. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide an ultra-macro telephoto camera module, which can achieve a smaller volume and meet the demand for miniaturization.

[0005] The present invention provides an ultra-macro telephoto camera module, comprising at least two lens assemblies, a folding prism and a chip imaging assembly; the folding prism comprises a light-entry side and a light-exiting side, and the folding prism is arranged before the imaging surface of the chip imaging assembly; at least one lens assembly of the at least two lens assemblies comprises a super lens, and at least one of the object side and image side surfaces of the super lens is provided with a micro-nano structure; the at least two lens assemblies are both arranged before the light-entry side of the folding prism; or, at least one lens assembly of the at least two lens assemblies is arranged before the light-entry side of the folding prism, and at least one lens assembly of the at least two lens assemblies is arranged after the light-exiting side of the folding prism and before the imaging surface of the chip imaging assembly.

[0006] Optionally, the at least two lens assemblies include a first lens assembly and a second lens assembly, the first lens assembly is arranged before the light-entering side of the folding prism, and the second lens assembly is arranged after the light-exiting side of the folding prism and before the imaging surface of the chip imaging assembly.

[0007] Optionally, the second lens assembly includes at least a refractive lens and the metalens.

[0008] Optionally, the second lens assembly is provided with only one super lens.

[0009] Optionally, the at least two lens assemblies further include a third lens assembly disposed before the light incident side of the folding prism. The third lens assembly is provided with a first metalens, and the second lens assembly is provided with a second metalens.

[0010] Optionally, the ultra-macro long-focus camera module further includes a filter or a filter film, and the filter or the filter film is disposed on the light incident side and / or the light exiting side of the folding prism.

[0011] Optionally, the at least two lens assemblies are all disposed before the light incident side of the folding prism, and the metalens is disposed on at least one of the at least two lens assemblies.

[0012] Optionally, the metalens includes a filter film, and the filter film is disposed on the object side surface or the image side surface of the substrate of the metalens.

[0013] Optionally, at least one of the at least two lens assemblies moves along the optical axis direction for focusing, and the focusing stroke z1 satisfies: 0.15 mm < z1 < 1 mm.

[0014] Optionally, for the total height HZ1 from the axially outermost point of the object side surface of the lens closest to the object side among the at least two lens assemblies to the bottom of the folding prism, the total height HZ2 from the bottom of the folding prism to the imaging surface, and the effective focal length EFL of the ultra-macro long-focus camera module, they satisfy: HZ1 < 0.7EFL, HZ2 < 0.5EFL.

[0015] Optionally, the thickness CTM of the optical component disposed between the light exiting side of the folding prism and the chip imaging component satisfies: 0.1 mm < CTM < 0.4 mm, and the distance BFL from the light exiting side of the folding prism to the imaging surface satisfies: 0.8 mm < BFL < 1.05 mm.

[0016] Optionally, the focal length EFL2 of the metalens satisfies: 2 mm < EFL2 < 200 mm. <​​​Optionally, a total height HT2 from the light-emitting side of the folding prism to the imaging surface, and a total height HZ2 from the bottom of the folding prism to the imaging surface satisfy: 0.1<HT2 / HZ2<0.5.

[0019] The ultra-macro telephoto camera module provided by the present invention not only achieves optical path folding through multiple light path reflections via a folding prism, significantly reducing the overall height and shoulder height of the ultra-macro telephoto camera module, but also utilizes a superlens, which inherently has an extremely small thickness, by combining the refractive lens of this lens assembly with the superlens of the other lens assembly. This allows for a combination of geometric and diffractive optics, using the refractive lens for geometric optics to resolve chromatic aberration issues associated with the superlens, while also using the superlens for diffractive optics to correct the optical path. Consequently, the ultra-macro telephoto camera module can be smaller, meeting miniaturization requirements while maintaining its original optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to an embodiment of the present application is shown.

[0022] Figure 2 A schematic diagram of the structure after folding the optical path of the ultra-macro telephoto camera module according to an embodiment of the present application is shown.

[0023] Figure 3 yes Figure 2 Dimensional diagram.

[0024] Figure 4 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 1 of the present application is shown.

[0025] Figures 5 to 9 The MTF curve diagram, ray fan diagram, field curvature diagram, distortion diagram and relative illumination diagram of the ultra-macro telephoto camera module of Example 1 in the close focus state are respectively shown.

[0026] Figure 10 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 2 of the present application is shown.

[0027] Figures 11 to 15The MTF curve diagram, ray fan diagram, field curvature diagram, distortion diagram and relative illumination diagram of the ultra-macro telephoto camera module of Example 2 in the close focus state are respectively shown.

[0028] Figure 16 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 3 of the present application is shown.

[0029] Figures 17 to 21 The MTF curve diagram, ray fan diagram, field curvature diagram, distortion diagram and relative illumination diagram of the ultra-macro telephoto camera module of Example 3 in the close focus state are respectively shown.

[0030] Figure 22 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 4 of the present application is shown.

[0031] Figures 23 to 27 The MTF curve diagram, ray fan diagram, field curvature diagram, distortion diagram and relative illumination diagram of the ultra-macro telephoto camera module of Example 4 in the close focus state are respectively shown.

[0032] Figure 28 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 5 of the present application is shown.

[0033] Figures 29 to 33 The MTF curve diagram, ray fan diagram, field curvature diagram, distortion diagram and relative illumination diagram of the ultra-macro telephoto camera module of Example 5 in the close focus state are respectively shown. DETAILED DESCRIPTION

[0034] The aforementioned and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and illustration purposes and are not intended to limit the present invention. Some well-known parts may not be shown. In the various drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the drawings are not necessarily drawn strictly according to the actual scale.

[0035] It should be understood that the terms "first," "second," "third," and "fourth," etc., are intended only to distinguish between components or circuits having similar properties, and do not indicate or imply relative importance or a particular order. The terms "comprise," "include," or any other variation thereof, are intended to cover a non-exclusive inclusion, and may include, in addition to the listed elements, other elements not explicitly listed.

[0036] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0037] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the image plane is called the image-side surface of the lens.

[0038] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] The features, principles and other aspects of the present application are described in detail below.

[0040] Please refer to Figure 1 and Figure 2 . Figure 1 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to an embodiment of the present application is shown; Figure 2 A schematic diagram of the structure after folding the optical path of the ultra-macro telephoto camera module according to an embodiment of the present application is shown.

[0041] According to the exemplary embodiment of the present application, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged before the imaging surface IMG of the chip imaging assembly. At least one lens assembly of the at least two lens assemblies includes a super lens M, and at least one of the object side and image side of the super lens M is provided with a micro-nano structure. At least one lens assembly of the at least two lens assemblies is arranged before the light-entry side of the folding prism G5, and at least one lens assembly of the at least two lens assemblies is arranged after the light-exiting side of the folding prism G5 and before the imaging surface IMG of the chip imaging assembly, or, at least two lens assemblies are arranged before the light-entry side of the folding prism G5. Among them, the lens assembly without the super lens M may include at least one refractive lens. Figure 1 and Figure 2 The example at least two lens assemblies include a first lens assembly 10 and a second lens assembly 20, that is, there are two lens assemblies, but the present application is not limited thereto. For example, the at least two lens assemblies may include three lens assemblies or four lens assemblies; and, Figure 1 and Figure 2In the example, the first lens assembly 10 is arranged before the light-entering side of the folding prism G5, and the second lens assembly 20 is arranged after the light-exiting side of the folding prism G5 and before the imaging surface IMG of the chip imaging assembly, but the present application is not limited thereto. For example, the first lens assembly 10 and the second lens assembly 20 can both be arranged before the light-entering side of the folding prism G5. In the present application, at least one of the at least two lens assemblies includes a metalens M. Figure 1 and Figure 2 In the embodiment, at least one of the first lens assembly 10 and the second lens assembly 20 includes a metalens M. In the embodiment, the second lens assembly 20 includes a metalens M. At least one of the object side surface and the image side surface of the metalens M is provided with a micro-nano structure. Figure 1 and Figure 2 In the example, a micro-nano structure is provided on the object side of the superlens M, but the present application is not limited to this. For example, a micro-nano structure is provided on the image side of the superlens M, and micro-nano structures can also be provided on both the object side and the image side of the superlens M.

[0042] The folding prism G5 includes a light-incoming side and a light-outgoing side. Figure 2 As shown, the light-incoming side and the light-outgoing side can be the same surface; however, the present application is not limited thereto. For example, the light-incoming side and the light-outgoing side can be at the top and bottom of the folding prism, or at the top and waist of the folding prism. After the light enters the folding prism G5 from the light-incoming side, it can pass through multiple times ( Figure 2 The example is 3 times, but the present application is not limited thereto) and then emitted from the light-emitting side. According to the corresponding positions of the at least two lens components, the light can penetrate the at least two lens components and the return prism G5 in the corresponding order, and finally projected onto the imaging surface IMG of the chip imaging component. In one embodiment, Figure 2 As shown, the light is reflected three times inside the folding prism G5; in the ultra-macro telephoto camera module, the light penetrates the first lens assembly 10 in the direction of the first optical axis o1 in turn, enters the folding prism G5 from the light incident side and is emitted toward the first reflection surface, and then is reflected in the direction of the second optical axis o2 toward the total reflection surface, and then is reflected in the direction of the third optical axis o3 toward the second reflection surface, and then is reflected in the direction of the fourth optical axis o4 through the light exit side, and is projected onto the imaging surface IMG of the chip imaging component after passing through the second lens assembly 20.

[0043] The folding prism G5 performs multiple light path reflections, folding the light path and changing the original straight-line direction of the light. The lens back focus optical path is folded within the folding prism G5, allowing light emitted from the folding prism G5 to reach the imaging surface IMG through a shorter optical path. This shortens the lens back focus length and significantly reduces the overall height and shoulder height of the camera module. By properly allocating the optical power, spacing, and refractive index of each lens in the first lens assembly 10 and the second lens assembly 20, and the angle and thickness of the folding prism G5, the overall height and shoulder height of the ultra-macro telephoto camera module can be significantly reduced, meeting the thickness requirements of terminal devices such as smartphones.

[0044] At least one of the object-side and image-side surfaces of the metalens M is provided with a micro-nanostructure. This micro-nanostructure is composed of a large number of subwavelength-sized units, such as highly precise nanopillars or nanofins, with typical dimensions ranging from tens to hundreds of nanometers, far smaller than the operating wavelength. The micro-nanostructure can be fabricated using high-refractive-index, low-loss dielectric materials such as titanium dioxide or silicon nitride. By precisely controlling the geometric dimensions or spatial rotation angle of each unit in the micro-nanostructure, the metalens M can apply localized phase modulation to light waves. When the units of the micro-nanostructure are arranged into an array according to a specific gradient pattern, they collaboratively construct optical functions similar to those of traditional curved lenses, ultimately achieving beam focusing, wavefront manipulation, or multi-physics field integration in a planar form. In this embodiment, the metalens itself has an extremely small thickness. Combining the refractive lens of another lens assembly with the metalens of this lens assembly achieves a combination of geometric and diffractive optics. The refractive lens is used to perform geometric optics to address the chromatic aberration problem of the metalens, while the metalens is used to perform diffractive optics to correct the optical path, resulting in a more compact, lightweight, powerful, and superior optical system.

[0045] Therefore, the ultra-macro telephoto camera module of the embodiment of the present invention can greatly reduce the total height and shoulder height of the ultra-macro telephoto camera module through the folding prism G5 and the super lens M, and can achieve a smaller volume of the ultra-macro telephoto camera module to meet the needs of miniaturization.

[0046] In an exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, a lens in any of the at least two lens assemblies is a metalens M, or at least one refractive lens, which can be spherical or aspherical. In one exemplary embodiment, the lens closest to the object of the at least two lens assemblies is a refractive lens with positive optical power, which can focus light.

[0047] In an exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, the optical component disposed between the light-exiting side of the folding prism G5 and the imaging surface IMG of the chip imaging component can be at least one of a lens assembly and an optical filter IR. The lens in the lens assembly can be a metalens M, or at least one refractive lens, which can be molded spherically or aspherically. In one exemplary embodiment, the optical component disposed between the light-exiting side of the folding prism G5 and the imaging surface IMG of the chip imaging component is a lens assembly or an optical filter IR. This lens assembly includes only the metalens M, which can reduce the shoulder height of the ultra-macro telephoto camera module.

[0048] In an exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, when a lens in one of the at least two lens assemblies is a refractive lens, the material of the lens can be glass, plastic, or a glass-plastic mixture.

[0049] The present application does not limit the position and number of the superlens M. The superlens M can be set in at least one lens assembly of at least two lens assemblies, and at least one lens assembly of the at least two lens assemblies is arranged before the light-entering side of the return prism G5, and at least one lens assembly of the at least two lens assemblies is arranged after the light-exiting side of the return prism G5 and before the imaging surface IMG of the chip imaging assembly. Alternatively, at least two lens assemblies are arranged before the light-entering side of the return prism G5, then the superlens M can be set in the lens assembly arranged after the light-exiting side of the return prism G5 and before the imaging surface IMG of the chip imaging assembly, or can be set in any lens assembly arranged before the light-entering side of the return prism G5; when the superlens M is set in any lens assembly arranged before the light-entering side of the return prism G5, it can be set in the lens assembly closest to the object side, or in the lens assembly closest to the light-entering side of the return prism G5, or in the lens assembly adjacent to the other two lens assemblies in front and behind.

[0050] In an exemplary embodiment, Figure 1 and Figure 2 As shown, according to the ultra-macro telephoto camera module of the present application, at least two lens assemblies include a first lens assembly 10 and a second lens assembly 20. The first lens assembly 10 is arranged before the light-incoming side of the folding prism G5, and the second lens assembly 20 is arranged after the light-outgoing side of the folding prism G5 and before the imaging surface IMG of the chip imaging assembly.

[0051] In one exemplary embodiment, the second lens assembly 20 includes at least a refractive lens and a metalens M, which can achieve a combination of geometric optics and diffraction optics to improve performance.

[0052] In one exemplary embodiment, the second lens assembly 20 is provided with only one metalens M, which can reduce the shoulder height of the ultra-macro telephoto camera module and improve performance.

[0053] It should be noted that when the super lens M is arranged adjacent to the surface of the return prism G5 (for example, the light input side or the light output side), the super lens M can be separated from the surface of the return prism G5 to be arranged separately, or it can be attached to the surface of the return prism G5.

[0054] In one exemplary embodiment, the at least two lens assemblies further include a third lens assembly ( Figure 1 and Figure 2 (Not shown) The third lens assembly is positioned before the light-entering side of the folding prism G5. The third lens assembly includes a first metalens, and the second lens assembly 20 includes a second metalens. The first metalens achieves greater optical power with a smaller thickness, reducing the total height of the multiple lens assemblies before the light-entering side of the folding prism G5, thereby reducing the overall module height. The second metalens reduces the shoulder height of the ultra-macro telephoto camera module, improving performance.

[0055] In one exemplary embodiment, the ultra-macro telephoto camera module further includes an IR filter or a filter film ( Figure 1 and Figure 2 (not shown), a filter IR or a filter film is provided on the light-incoming side and / or the light-outgoing side of the folding prism G5, and can be used to correct color deviation.

[0056] In one exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, at least two lens assemblies are arranged before the light-entering side of the folding prism G5, and the metalens M is provided in at least one of the at least two lens assemblies. A filter IR may be provided between the light-exiting side of the folding prism G5 and the imaging surface IMG of the chip imaging assembly. The metalens M provides greater optical power with a smaller thickness, which can reduce the total height of the multiple lens assemblies before the light-entering side of the folding prism G5, thereby reducing the overall module height.

[0057] In an exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, the metalens M includes a filter film, which is disposed on the object-side surface and / or image-side surface of the substrate of the metalens M. The micro-nanostructure of the metalens M can be disposed above the filter film or above the substrate. If the micro-nanostructure of the metalens M is disposed above the filter film, the filter film is disposed on the object-side surface and / or image-side surface of the substrate, and the micro-nanostructure is disposed above the filter film. This structure eliminates the need for a separate filter or filter film, thereby reducing the module height.

[0058] In an exemplary embodiment, the ultra-macro telephoto camera module according to the present application further includes an aperture stop (STO). Preferably, the aperture stop (STO) may be disposed on the object-side surface of the refractive lens closest to the object in the lens assembly closest to the object. However, the present application is not limited thereto; the aperture stop (STO) may also be disposed between two adjacent lenses in the lens assembly, for example.

[0059] In an exemplary embodiment, the ultra-macro telephoto camera module of the present application moves at least one of the at least two lens assemblies along the optical axis for focusing, with the focus stroke z1 satisfying 0.15mm < z1 < 1mm. By controlling the value of the focus stroke z1 and moving at least one of the at least two lens assemblies along the optical axis for AF, the module is applicable to all chips under 1 / 1.56 inches. With an equivalent focal length greater than 70mm, it achieves excellent imaging quality at close focus, such as 15cm, and at infinity.

[0060] In an exemplary embodiment, according to the ultra-macro telephoto camera module of the present application, at least one of the at least two lens assemblies moves along the optical axis direction to perform focusing AF, and can also move in the XY direction (the direction of the optical axis is the Z axis) to achieve the OIS anti-shake effect; and the grouping setting can make the AF&OIS stroke 50%-80% of the conventional focusing stroke to meet the requirement of reducing the height, which is conducive to the miniaturization of the camera module.

[0061] In an exemplary embodiment, Figure 3 As shown, the total height HZ1 from the axial outermost point of the object side surface of the lens closest to the object side in at least two lens assemblies to the bottom of the reentry prism G5, the total height HZ2 from the bottom of the reentry prism to the imaging surface IMG, and the effective focal length EFL of the super macro telephoto camera module satisfy the following conditions: HZ1 < 0.7EFL, HZ2 < 0.5EFL. Controlling the total height HZ1 from the axial outermost point of the object side surface of the lens closest to the object side in at least two lens assemblies to the bottom of the reentry prism G5, the total height HZ2 from the bottom of the reentry prism to the imaging surface IMG, and the effective focal length EFL of the super macro telephoto camera module is beneficial for controlling the size of the camera module and achieving miniaturization of the camera module.

[0062] In an exemplary embodiment, for the ultra-macroscopic telephoto camera module according to the present application, the thickness CTM of the optical component disposed between the light-emitting side of the retroflection prism G5 and the imaging surface IMG of the chip imaging component satisfies 0.1 mm < CTM < 0.4 mm, and the distance BFL from the light-emitting side of the retroflection prism G5 to the imaging surface IMG satisfies: 0.8 mm < BFL < 1.05 mm; the optical component may be a lens component including a superlens, or may be a filter IR; by setting an appropriate thickness of the optical component, the shoulder height of the camera module can be controlled.

[0063] In an exemplary embodiment, the ultra-macroscopic telephoto camera module according to the present application can satisfy 2 mm < EFL2 < 200 mm; where EFL2 is the focal length of the superlens M. Satisfying 2 mm < EFL2 < 200 mm, by controlling the value range of the focal length EFL2 of the superlens M, it is beneficial to optimize system performance, correct aberration, improve design freedom, and directly affect imaging quality and system compactness.

[0064] In an exemplary embodiment, as Figure 3 shown, the ultra-macroscopic telephoto camera module according to the present application can satisfy 0.3 < HT1 / HZ1 < 0.8; where HT1 is the total height from the axially outermost point of the object side surface of the lens closest to the object side among at least two lens components to the axially outermost point of the image side surface of the lens closest to the light-incident side of the retroflection prism G5, and HZ1 is the total height from the axially outermost point of the object side surface of the lens closest to the object side among at least two lens components to the bottom of the retroflection prism G5. Satisfying 0.3 < HT1 / HZ1 < 0.8, by controlling the ratio range of the total height HT1 from the axially outermost point of the object side surface of the lens closest to the object side among at least two lens components to the axially outermost point of the image side surface of the lens closest to the light-incident side of the retroflection prism G5, and the total height HZ1 from the axially outermost point of the object side surface of the lens closest to the object side among at least two lens components to the bottom of the retroflection prism G5, it helps to reasonably allocate the height.

[0065] In an exemplary embodiment, as Figure 3 shown, the ultra-macroscopic telephoto camera module according to the present application can satisfy 0.1 < HT2 / HZ2 < 0.5; where HT2 is the total height from the light-emitting side of the retroflection prism G5 to the imaging surface IMG, and HZ2 is the total height from the bottom of the retroflection prism G5 to the imaging surface IMG. Satisfying 0.1 < HT2 / HZ2 < 0.5, by controlling the ratio range of the total height HT2 from the light-emitting side of the retroflection prism G5 to the imaging surface IMG and the total height HZ2 from the bottom of the retroflection prism G5 to the imaging surface IMG, the shoulder height of the module can be controlled.

[0066] In an exemplary embodiment, for the ultra-macro long-focus camera module according to the present application, the angles of the folding prism G5 satisfy 25° < θ1 < 38° and 25° < θ2 < 38°, where θ1 is the angle between the light incident side and the reflecting surface of the first reflection, and θ2 is the angle between the light exiting side and the reflecting surface of the last reflection. By satisfying 25° < θ1 < 38° and 25° < θ2 < 38°, and controlling the value ranges of the angle θ1 between the light incident side and the reflecting surface of the first reflection and the angle θ2 between the light exiting side and the reflecting surface of the last reflection, it is beneficial to ensure that the folding prism G5 has a smaller thickness, and thus beneficial to the miniaturization of the camera module.

[0067] In one exemplary embodiment, the angles of the folding prism G5 satisfy θ1 = θ2, which is beneficial to the installation and processing of the folding prism G5.

[0068] In an exemplary embodiment, the ultra-macro long-focus camera module according to the present application satisfies 0.3 < F.No / HZ1 < 2, where F.No is the working F-number of the ultra-macro long-focus camera module, and HZ1 is the total height from the axially outermost point of the object side surface of the lens closest to the object among at least two lens components to the bottom of the folding prism G5. By satisfying 0.3 < F.No / HZ1 < 2 and controlling the ratio range of the working F-number F.No of the ultra-macro long-focus camera module to the total height HZ1 from the axially outermost point of the object side surface of the lens closest to the object among at least two lens components to the bottom of the folding prism G5, it can be ensured that the lens components can receive a sufficient amount of light, guaranteeing the imaging quality of the camera module.

[0069] In an exemplary embodiment, the refractive lens closest to the object among at least two lens components is set as the first lens P1, and the focal length f of the ultra-macro long-focus camera module and the focal length f1 of the first lens P1 satisfy: 1.2 < f / f1 < 3. By controlling the ratio range of the focal length f of the ultra-macro long-focus camera module and the focal length f1 of the first lens P1, it is beneficial for a relatively large optical power to converge light and satisfy the focal length of the lens.

[0070] In an exemplary embodiment, at least two lens components include a lens component disposed before the light incident side of the folding prism G5. This lens component includes multiple refractive lenses, which are, in order from the object side to the image side, the first lens P1, the second lens P2, the third lens P3, and the fourth lens P4. The central thickness CT1 of the first lens P1, the central thickness CT2 of the second lens P2, the central thickness CT3 of the third lens P3, and the central thickness CT4 of the fourth lens P4 satisfy: 0.5 < CT1 / (CT2 + CT3 + CT4) < 4.0. By controlling the relatively large central thickness CT1 of the first lens P1, it is beneficial to converge light and control the height of the lens component.

[0071] In an exemplary embodiment, the at least two lens assemblies include a lens assembly disposed before the light-entering side of the folding prism G5. This lens assembly includes a plurality of refractive lenses, namely, first lens P1, second lens P2, third lens P3, and fourth lens P4, from the object side to the image side. The central thickness CT1 of first lens P1, the radius of curvature R11 of the object-side surface of first lens P1, and the radius of curvature R12 of the image-side surface of first lens P1 satisfy the following conditions: 5 < CT1 * (R12 / R11) < 30. By controlling the central thickness CT1 of first lens P1, the radius of curvature R11 of the object-side surface of first lens P1, and the radius of curvature R12 of the image-side surface of first lens P1, smooth light convergence is facilitated.

[0072] In an exemplary embodiment, the thickness of the folding prism G5 after the folded optical path satisfies the condition 2.8mm < CT5 < 4mm. By controlling the thickness CT5 of the folding prism G5 after the folded optical path, the folded optical path of the lens back focus optical path within the folding prism G5 can be controlled. This allows light emitted from the folding prism G5 to reach the imaging surface IMG after a shorter optical path, correspondingly shortening the lens back focus length and significantly reducing the overall height and shoulder height of the ultra-macro telephoto camera module.

[0073] In an exemplary embodiment, the lens assembly closest to the object side of the at least two lens assemblies is configured such that the first refractive lens from the object side to the image side of the lens assembly is the first lens P1, and the refractive index n1 and the chromatic aberration coefficient V1 of the first lens P1 satisfy 1.55≤n1≤1.1.98 and 45≤V1≤90. By controlling the chromatic aberration of the first lens P1, the burden of correcting chromatic aberration on other lenses is reduced, thereby leaving degrees of freedom for correcting other aberrations.

[0074] In an exemplary embodiment, the driving component and the imaging component may be assembled integrally or separately.

[0075] In an exemplary embodiment, the light-incoming side, multiple reflective surfaces and light-emitting side of the folding prism G5 are coated with ink, silk-screened, etc. to suppress the influence of stray light, and the silk-screened area is bounded by a light spot of 0.7F on the short side and 0.9F on the long side.

[0076] In an exemplary embodiment, the folding prism G5 may be in the form of two prisms glued together or in the form of a single prism with grooves.

[0077] In an exemplary embodiment, the folding prism G5 can be modified by cutting or rounding the corners. The cutting and rounding of the corners are coated, silk-screened, etc. to suppress the influence of stray light, which helps to improve the reliability of the module and reduce stray light.

[0078] In an exemplary embodiment, the auto focus (AF) drive of the first lens assembly may adopt a voice coil motor (VCM), and its motion guide structure may adopt a suspension wire, a spring, a ball bearing, or a guide rod.

[0079] Based on the same inventive concept, an electronic device according to an exemplary embodiment of the present application includes the aforementioned ultra-macro telephoto camera module. The electronic device may be, but is not limited to, a smartphone, a tablet computer, a laptop computer, a pan / tilt camera, a surveillance camera, an in-vehicle monitoring device, or other imaging device. The implementation of this electronic device can be referenced in the embodiments of the ultra-macro telephoto camera module, and any repetitive details will not be repeated.

[0080] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses comprising the lens assembly in the camera module may be varied to achieve the various results and advantages described herein. For example, although some embodiments describe a lens assembly comprising four refractive lenses as an example, the lens assembly in the camera module is not limited to comprising four refractive lenses and, if desired, may also include other numbers of lenses.

[0081] Specific embodiments of the ultra-macro telephoto camera module applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0082] Example 1 The following reference Figure 4 Describe the ultra-macro telephoto camera module according to Example 1 of the present application. Figure 4 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 1 of the present application is shown.

[0083] like Figure 4 As shown, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged in front of the imaging surface IMG of the chip imaging assembly. At least two lens assemblies include a first lens assembly 10 and a second lens assembly 20. The first lens assembly 10 is arranged in front of the light-entry side of the folding prism G5, and the second lens assembly 20 is arranged after the light-exiting side of the folding prism G5 and in front of the imaging surface IMG of the chip imaging assembly. The super lens M is only arranged in the second lens assembly 10. The first lens assembly 10 can be moved along the optical axis for focusing. The first lens assembly 10 includes a plurality of refractive lenses, which are the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4 from the object side to the image side. A stop STO can be set on the object side of the first lens P1. The second lens assembly 20 only includes a super lens M, and the super lens M is provided with a micro-nano structure ( Figure 4The micro-nano structure is omitted due to image size limitations). In Example 1, the superlens M is only provided in the second lens assembly 20 arranged behind the light-emitting side of the folding prism G5 and before the imaging surface IMG of the chip imaging assembly, and the second lens assembly 20 only includes the superlens M; in other embodiments, the second lens assembly 20 may include at least one refractive lens and one superlens M. In other embodiments, the ultra-macro telephoto camera module further includes a filter IR, which is provided on the light-input side and / or the light-output side of the folding prism G5. In other embodiments, the superlens M includes a filter film, which is provided on the object surface and / or the image surface of the substrate of the superlens M; the micro-nano structure of the superlens M may be provided above the filter film or above the substrate; if the micro-nano structure of the superlens M of this embodiment is provided above the filter film, a filter film is provided on the object surface of the substrate, and a micro-nano structure is provided above the filter film. Please also refer to the following. Figure 4 As shown in Table 1, the first lens P1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens P2 has positive focal power, and its object side surface is convex, and its image side surface is convex. The third lens P3 has negative focal power, and its object side surface is concave, and its image side surface is concave. The fourth lens P4 has positive focal power, and its object side surface is convex, and its image side surface is convex. The super lens M has an object side surface and an image side surface. The light from the object first passes through the first lens assembly 10, specifically the aperture STO, the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4; then it is incident on the folding prism G5 through the incident surface, and after multiple reflections inside the folding prism G5, it is emitted through the light-emitting side; then it passes through the second lens assembly 20, i.e., the super lens M, and is projected onto the imaging surface IMG of the chip imaging component.

[0084] Table 1 shows the basic parameters of the ultra-macro telephoto camera module of Example 1, wherein the units of curvature radius, thickness, focal length and aperture are all millimeters (mm).

[0085] Table 1:

[0086] Among them, P1R1 represents the object-side surface of the first lens P1, and P1R2 represents the image-side surface of the first lens P1; P2R1 represents the object-side surface of the second lens P2, and P2R2 represents the image-side surface of the second lens P2; P3R1 represents the object-side surface of the third lens P3, and P3R2 represents the image-side surface of the third lens P3; P4R1 represents the object-side surface of the fourth lens P4, and P4R2 represents the image-side surface of the fourth lens P4; G5R1 represents the incident surface of the folding prism G5, and G5R2 represents the light-exiting side of the folding prism G5; MetaR1 represents the object-side surface of the metalens M, and MetaR2 represents the image-side surface of the metalens M. The positive and negative signs of the radius of curvature are distinguished by the left and right of the center of the surface, with the object side on the left and the image side on the right. If the surface is to the left of the center of the circle, the radius of curvature is positive, and if the surface is to the right of the center of the circle, the radius of curvature is negative.

[0087] In Example 1, the object-side surface and the image-side surface of any lens from the first lens element P1 to the fourth lens element P4 may both be even-order aspheric surfaces, and the surface shape of the even-order aspheric surface may be defined by the following formula: (1) Among them, Z represents the height in the direction of the optical axis, c is the inverse of the surface radius, k is the cone coefficient, and y is the aperture in the radial direction; A4 is the 4th-order aspheric coefficient, A6 is the 6th-order aspheric coefficient, A8 is the 8th-order aspheric coefficient, A10 is the 10th-order aspheric coefficient, A12 is the 12th-order aspheric coefficient, A14 is the 14th-order aspheric coefficient, A16 is the 16th-order aspheric coefficient, A18 is the 18th-order aspheric coefficient, and A20 is the 20th-order aspheric coefficient.

[0089] Table 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 when the object-side and image-side surfaces of the first to fourth lenses P1 to P4 in Example 1 are even-order aspheric surfaces.

[0090] Table 2:

[0091] Table 3 shows the coefficients C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10 of different order aberration correction items of order 1 that can be used in Example 1 when a micro-nano structure is set on the object side of the metalens M.

[0092] Table 3:

[0093] In Embodiment 1, the system focal length f' of the ultra-macro long-focus camera module is 20 mm, the aperture value F# is 2.5, the maximum imaging circle diameter MIC is 10.24 mm, the working wavelength range is 430 - 650 nm, the field angle is 32°, and the total optical length is 26.57 mm. The optical component disposed between the light-emitting side of the retroflection prism G5 and the imaging surface IMG of the chip imaging component is the second lens component 20. Since the second lens component 20 only includes a meta-lens M, the thickness CTM of the optical component is the thickness 0.21 mm of the meta-lens M, satisfying 0.1 mm < CTM < 0.4 mm. Moreover, the distance BFL from the light-emitting side of the retroflection prism G5 to the imaging surface IMG is 0.21 + 0.21 + 0.50 = 0.92 mm, satisfying 0.8 mm < BFL < 1.05 mm. The focal length EFL2 of the meta-lens M is 148.7 mm, satisfying 2 mm < EFL2 < 200 mm.

[0094] Figure 5 The MTF curve graph in the near-focus state of the ultra-macro long-focus camera module of Embodiment 1 is shown. The MTF (Modulation Transfer Function) curve shows the transmission of the imaging system for image details (i.e., image contrast) at different spatial frequencies. At a macro distance of 15 cm and a spatial frequency of 240 lp / mm, the OTF modulus is greater than 0.1, indicating good resolution. Figure 6 The fan diagram of the ultra-macro long-focus camera module of Embodiment 1 is shown. The fan diagram usually shows the cross-section of the light beam at different positions, as well as the propagation path and changes in the optical system, and is a comprehensive evaluation diagram of various aberrations. Its scale is ±0.01 um, that is, the scale range in the horizontal and vertical directions is ±0.01 um, and various aberrations are well corrected, and the overall aberration of the system is very small. Figure 7 The field curvature graph of the ultra-macro long-focus camera module of Embodiment 1 is shown. The field curvature is less than ±0.05 mm, indicating good correction. Figure 8 The distortion graph of the ultra-macro long-focus camera module of Embodiment 1 is shown. The distortion is less than 2%, indicating good correction. Figure 13 The relative illuminance and actual chief ray image height graph of the periscope fisheye lens of Embodiment 2 are shown. The relative illuminance is greater than 60%, and the picture brightness is uniform. According to Figures 5 to 9 It can be seen that the ultra-macro long-focus camera module given in Embodiment 1 has good resolution in the near-focus state, good correction, uniform picture brightness, and can achieve good imaging quality.

[0095] Example 2 The following refers to Figure 10 Describe the ultra-macro long-focus camera module according to Embodiment 2 of the present application. Figure 10A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 2 of the present application is shown.

[0096] like Figure 10 As shown, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged in front of the imaging surface IMG of the chip imaging assembly. At least two lens assemblies include a first lens assembly 10 and a second lens assembly 20. The first lens assembly 10 is arranged in front of the light-entry side of the folding prism G5, and the second lens assembly 20 is arranged after the light-exiting side of the folding prism G5 and in front of the imaging surface IMG of the chip imaging assembly. The super lens M is only arranged in the second lens assembly 10. The first lens assembly 10 can be moved along the optical axis for focusing. The first lens assembly 10 includes a plurality of refractive lenses, which are the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4 from the object side to the image side. A stop STO can be set on the object side of the first lens P1. The second lens assembly 20 only includes a super lens M, and the super lens M is provided with a micro-nano structure ( Figure 10 The micro-nano structure is omitted in the figure due to image size limitations). In Example 2, the superlens M is only provided in the second lens assembly 20 arranged behind the light-exiting side of the folding prism G5 and before the imaging surface IMG of the chip imaging component, and the second lens assembly 20 only includes the superlens M; in other embodiments, the second lens assembly 20 may include at least one refractive lens and one superlens M. In other embodiments, the ultra-macro telephoto camera module further includes a filter IR, which is provided on the light-incoming side and / or the light-exiting side of the folding prism G5. In other embodiments, the superlens M includes a filter film, which is provided on the object-side surface and / or the image-side surface of the substrate of the superlens M; the micro-nano structure of the superlens M may be provided above the filter film or above the substrate; if the micro-nano structure of the superlens M of this embodiment is provided above the filter film, then a filter film is provided on the image-side surface of the substrate, and the micro-nano structure is provided above the filter film.

[0097] Please also refer to the following Figure 10As shown in Table 4, the first lens P1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens P2 has positive focal power, and its object side surface is convex, and its image side surface is convex. The third lens P3 has negative focal power, and its object side surface is concave, and its image side surface is concave. The fourth lens P4 has positive focal power, and its object side surface is convex, and its image side surface is convex. The super lens M has an object side surface and an image side surface. The light from the object first passes through the first lens assembly 10, specifically the aperture STO, the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4; then it is incident on the folding prism G5 through the incident surface, and after multiple reflections inside the folding prism G5, it is emitted through the light-emitting side; then it passes through the second lens assembly 20, i.e., the super lens M, and is projected onto the imaging surface IMG of the chip imaging component.

[0098] Table 4 shows the basic parameters of the ultra-macro telephoto camera module of Example 2, wherein the units of curvature radius, thickness, focal length and aperture are all millimeters (mm).

[0099] Table 4:

[0100] Table 5 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the object-side and image-side surfaces of the first to fourth lenses P1 to P4, which can be used in Example 2, when the surfaces are even-order aspheric surfaces. The surface shape of each even-order aspheric surface can be defined by formula (1) given in Example 1.

[0101] Table 5:

[0102] Table 6 shows the coefficients C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10 of different order aberration correction items of order 1 that can be used in Example 2 when a micro-nano structure is provided on the image side of the metalens M.

[0103] Table 6:

[0104] In Embodiment 2, the system focal length f' of the ultra-macro long-focus camera module is 14.1 mm, the aperture value F# is 2.6, the maximum imaging circle diameter MIC is 8.6 mm, the working wavelength range is 430 - 650 nm, the field angle is 32°, and the overall optical length is 26.8 mm. The optical component disposed between the light-emitting side of the folding prism G5 and the imaging surface IMG of the chip imaging component is the second lens component 20. Since the second lens component 20 only includes a meta-lens M, the thickness CTM of the optical component is the thickness 0.21 mm of the meta-lens M, satisfying 0.1 mm < CTM < 0.4 mm. Moreover, the distance BFL from the light-emitting side of the folding prism G5 to the imaging surface IMG is 0.21 + 0.21 + 0.5 = 0.91 mm, satisfying 0.8 mm < BFL < 1.05 mm. The focal length EFL2 of the meta-lens M is 153.8 mm, satisfying 2 mm < EFL2 < 200 mm.

[0105] Figure 11 The MTF (Modulation Transfer Function) curve diagram of the ultra-macro long-focus camera module in the near-focus state of Embodiment 2 is shown. The MTF curve shows the transmission of image details (i.e., image contrast) of different spatial frequencies by the imaging system. At a macro distance of 15 cm and a spatial frequency of 240 lp / mm, the OTF modulus is greater than 0.2, indicating good resolution. Figure 12 The fan diagram of the ultra-macro long-focus camera module in Embodiment 2 is shown. The fan diagram usually shows the cross-section of the light beam at different positions, as well as the propagation path and changes in the optical system, and is a comprehensive evaluation diagram of various aberrations. Its scale is ±20 μm, that is, the scale range in the horizontal and vertical directions is ±20 μm, and various aberrations are well corrected, with very small overall system aberrations. Figure 13 The field curvature diagram of the ultra-macro long-focus camera module in Embodiment 2 is shown. The field curvature is less than ±0.02 mm, indicating good correction. Figure 14 The distortion diagram of the ultra-macro long-focus camera module in Embodiment 2 is shown. The distortion is less than 2%, indicating good correction. Figure 15 The relative illuminance and actual chief ray image height diagram of the periscope fisheye lens in Embodiment 2 are shown. The relative illuminance is greater than 60%, and the image brightness is uniform. According to Figures 11 to 15 It can be seen that the ultra-macro long-focus camera module given in Embodiment 2 has good resolution in the near-focus state, good correction, uniform image brightness, and can achieve good imaging quality. [[ID=​​​​​​​​

[0107] like Figure 16 As shown, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged in front of the imaging surface IMG of the chip imaging assembly. At least two lens assemblies include a first lens assembly 10 and a second lens assembly 20. The first lens assembly 10 is arranged in front of the light-entry side of the folding prism G5, and the second lens assembly 20 is arranged after the light-exiting side of the folding prism G5 and in front of the imaging surface IMG of the chip imaging assembly. The super lens M is only arranged in the second lens assembly 10. The first lens assembly 10 can be moved along the optical axis for focusing. The first lens assembly 10 includes a plurality of refractive lenses, which are the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4 from the object side to the image side. A stop STO can be set on the object side of the first lens P1. The second lens assembly 20 only includes a super lens M, and the super lens M is provided with a micro-nano structure ( Figure 16 The micro-nano structure is omitted due to image size limitations). In Example 3, the superlens M is only provided in the second lens assembly 20 arranged after the light-exiting side of the folding prism G5 and before the imaging surface IMG of the chip imaging component, and the second lens assembly 20 only includes the superlens M. In other embodiments, the second lens assembly 20 may include at least one refractive lens and one superlens M. In other embodiments, the ultra-macro telephoto camera module further includes a filter IR, which is provided on the light-incoming side and / or the light-exiting side of the folding prism G5. In other embodiments, the superlens M includes a filter film, which is provided on the object-side surface and / or the image-side surface of the substrate of the superlens M. The micro-nano structure of the superlens M may be provided above the filter film or above the substrate. If the micro-nano structure of the superlens M of this embodiment is provided above the filter film, a filter film is provided on the object-side surface and / or the image-side surface of the substrate, and the micro-nano structure is provided above the filter film.

[0108] Please also refer to the following Figure 16 As shown in Table 7, the first lens P1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens P2 has positive focal power, its object side surface is convex, and its image side surface is concave. The third lens P3 has negative focal power, its object side surface is convex, and its image side surface is concave. The fourth lens P4 has negative focal power, its object side surface is concave, and its image side surface is concave. The super lens M has an object side surface and an image side surface. The light from the object first passes through the first lens assembly 10, specifically the aperture STO, the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4; then it is incident on the folding prism G5 through the incident surface, and after multiple reflections inside the folding prism G5, it is emitted through the light-emitting side; then it passes through the second lens assembly 20, i.e., the super lens M, and is projected onto the imaging surface IMG of the chip imaging component.

[0109] Table 7 shows the basic parameter table of the ultra-macro long-focus camera module of Embodiment 3. Among them, the units of the radius of curvature, thickness, focal length, and aperture are all millimeters (mm).

[0110] Table 7:

[0111] Table 8 shows the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 when the object side and image side of the first lens P1 to the fourth lens P4 used in Embodiment 3 are even aspherical surfaces. Among them, the surface type of each even aspherical surface is defined by the formula (1) given in Embodiment 1 above.

[0112] Table 8:

[0113] Table 9 shows the aberration correction term coefficients C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10 of order 1 when the meta-lens M used in Embodiment 3 has micro-nano structures on both the object side and the image side.

[0114] Table 9:

[0115] In Embodiment 3, the system focal length f' of the ultra-macro long-focus camera module is 19.1 mm, the aperture value F# is 2.6, the maximum imaging circle diameter MIC is 8 mm, the working band is 430 - 650 nm, the field angle is 26°, and the total optical length is 23 mm. The optical component provided between the light-emitting side of the folding prism G5 and the imaging surface IMG of the chip imaging component is the second lens component 20. Since the second lens component 20 only includes the meta-lens M, the thickness CTM of the optical component is the thickness 0.21 mm of the meta-lens M, satisfying 0.1 mm < CTM < 0.4 mm. And the distance BFL from the light-emitting side of the folding prism G5 to the imaging surface IMG is 0.21 + 0.21 + 0.40 = 0.82 mm, satisfying: 0.8 mm < BFL < 1.05 mm. The focal length EFL2 of the meta-lens M is 10.8 mm, satisfying: 2 mm < EFL2 < 200 mm.

[0116] Figure 17 Shows the MTF curve graph in the near-focus state of the ultra-macro long-focus camera module of Embodiment 3. The MTF (Modulation Transfer Function) curve shows the transmission of the imaging system for image details (i.e., image contrast) at different spatial frequencies. At a macro distance such as 15 cm and a spatial frequency of 250 lp / mm, the OTF modulus value is greater than 0.2, and the resolution is very good. Figure 18 The ray fan diagram of the ultra-macro telephoto camera module of Example 3 is shown. The ray fan diagram generally shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations. Its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um. Various aberrations are well corrected and the overall aberration of the system is very small. Figure 19 The field curvature diagram of the ultra-macro telephoto camera module of Example 3 is shown. The field curvature is less than ±0.008mm, and the correction is very good. Figure 20 The distortion diagram of the ultra-macro telephoto camera module of Example 3 is shown. The distortion is less than 2%, and the correction is very good. Figure 21 The relative illumination and actual main ray image height of the periscope fisheye lens of Example 3 are shown. The relative illumination is greater than 60%, and the brightness of the picture is uniform. Figures 17 to 21 It can be seen that the ultra-macro telephoto camera module provided in Example 3 has good resolution in the close focus state, good correction, uniform picture brightness, and can achieve good imaging quality.

[0117] Example 4 The following reference Figure 22 Describe the ultra-macro telephoto camera module according to Example 4 of the present application. Figure 22 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 4 of the present application is shown.

[0118] like Figure 22 As shown, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged in front of the imaging surface IMG of the chip imaging assembly. At least two lens assemblies are arranged in front of the light-entry side of the folding prism G5, and the super lens M is arranged in at least one of the lens assemblies of the at least two lens assemblies. The example is that the at least two lens assemblies include a first lens assembly 10 and a second lens assembly 20, and the super lens M is arranged in the second lens assembly 20. A filter IR can be arranged between the light-exiting side of the folding prism G5 and the imaging surface IMG of the chip imaging assembly. The second lens assembly 20 includes a super lens M; the super lens M is provided with a micro-nano structure ( Figure 22The micro-nano structure is omitted due to image size limitations). The first lens assembly 10 can be moved along the optical axis for focusing. The first lens assembly 10 includes a plurality of refractive lenses, which are, from the object side to the image side, a first lens P1, a second lens P2, a third lens P3, and a fourth lens P4. A stop STO can be provided on the object side of the first lens P1. In Example 4, the super lens M is only provided in the second lens assembly 20 closest to the object side, which is arranged before the light-entering side of the folding prism G5, and the second lens assembly 20 only includes the super lens M; in other embodiments, the second lens assembly 20 may include at least one refractive lens and one super lens M. In other embodiments, the ultra-macro telephoto camera module further includes a filter IR, which is provided on the light-entering side and / or the light-exiting side of the folding prism G5. In other embodiments, the superlens M includes a filter film, which is disposed on the object-side surface and / or image-side surface of the substrate of the superlens M. The micro-nano structure of the superlens M may be disposed above the filter film or above the substrate. If the micro-nano structure of the superlens M of this embodiment is disposed above the filter film, a filter film is disposed on the object-side surface and / or image-side surface of the substrate, and the micro-nano structure is disposed above the filter film.

[0119] Please also refer to the following Figure 22 As shown in Table 10, the superlens M has an object side surface and an image side surface. The first lens P1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens P2 has positive focal power, its object side surface is convex, and its image side surface is concave. The third lens P3 has negative focal power, its object side surface is convex, and its image side surface is concave. The fourth lens P4 has positive focal power, its object side surface is concave, and its image side surface is concave. The light from the object first passes through the second lens assembly 20 and the first lens assembly 10 in sequence, specifically the superlens M, the aperture STO, the first lens P1, the second lens P2, the third lens P3 and the fourth lens P4; then it is incident on the folding prism G5 through the incident surface, and after multiple reflections inside the folding prism G5, it is emitted through the light-emitting side; then it passes through the filter IR and is projected onto the imaging surface IMG of the chip imaging component.

[0120] Table 10 shows the basic parameters of the ultra-macro telephoto camera module of Example 4, where the units of curvature radius, thickness, focal length and aperture are all millimeters (mm).

[0121] Table 10:

[0122] Table 11 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the object-side and image-side surfaces of the first to fourth lenses P1 to P4, which can be used in Example 4, when the surfaces are even-order aspheric surfaces. The surface shape of each even-order aspheric surface can be defined by formula (1) given in Example 1.

[0123] Table 11:

[0124] Table 12 shows the coefficients C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10 of different order aberration corrections of order 1 when micro-nano structures are provided on both the object side and the image side of the metalens M used in Example 4.

[0125] Table 12:

[0126] In Example 4, the system focal length f' of the ultra-macro long-focus camera module is 20 mm, the aperture value F# is 2.5, the maximum imaging circle diameter MIC is 11.2 mm, the working wavelength range is 430 - 650 nm, the field angle is 32°, and the overall optical length is 25 mm. The optical component provided between the light-emitting side of the folding prism G5 and the imaging surface IMG of the chip imaging component is the filter IR. Then, the thickness CTM of the optical component is the thickness of the filter IR, which is 0.21 mm, satisfying 0.1 mm < CTM < 0.4 mm. Moreover, the distance BFL from the light-emitting side of the folding prism G5 to the imaging surface IMG is 0.30 + 0.21 + 0.40 = 0.91 mm, satisfying 0.8 mm < BFL < 1.05 mm. The focal length EFL2 of the metalens M is 120 mm, satisfying 2 mm < EFL2 < 200 mm.

[0127] Figure 23 Shows the MTF curve graph of the ultra-macro long-focus camera module in the near-focus state of Example 4. The MTF (Modulation Transfer Function) curve shows the transmission of the imaging system for image details (i.e., image contrast) at different spatial frequencies. At a macro distance of 15 cm and a spatial frequency of 240 lp / mm, the OTF modulus value is greater than 0.2, indicating good resolution. Figure 24 Shows the fan diagram of the ultra-macro long-focus camera module in Example 4. The fan diagram usually shows the cross-section of the light beam at different positions, as well as the propagation path and changes in the optical system, and is a comprehensive evaluation diagram of various aberrations. Its scale is ±20 um, that is, the scale range in the horizontal and vertical directions is ±20 um, and various aberration corrections are good, and the overall aberration of the system is small. Figure 25 Shows the field curvature graph of the ultra-macro long-focus camera module in Example  4. The field curvature is less than ±0.02 mm, and the correction is good. Figure 26 Shows the distortion graph of the ultra-macro long-focus camera module in Example 4. The distortion is less than 2%, and the correction is good. Figure 27 Shows the relative illuminance and actual chief ray image height graph of the periscope fisheye lens in Example 4. The relative illuminance is greater than 60%, and the picture brightness is uniform. According to Figures 23 to 27 It can be seen that the ultra-macro telephoto camera module provided in Example 4 has good resolution in the close focus state, good correction, uniform picture brightness, and can achieve good imaging quality.

[0128] Example 5 The following reference Figure 28 Describe the ultra-macro telephoto camera module according to Example 5 of the present application. Figure 28 A schematic diagram of the front structure of the folded optical path of the ultra-macro telephoto camera module according to Example 5 of the present application is shown.

[0129] like Figure 28 As shown, the ultra-macro telephoto camera module includes at least two lens assemblies, a folding prism G5 and a chip imaging assembly. The folding prism G5 includes a light-entry side and a light-exiting side, and the folding prism G5 is arranged in front of the imaging surface IMG of the chip imaging assembly. At least two lens assemblies include a first lens assembly 10, a second lens assembly 20 and a third lens assembly 30. The first lens assembly 10 and the third lens assembly 30 are both arranged in front of the light-entry side of the folding prism G5, and the second lens assembly 20 is arranged after the light-exiting side of the folding prism G5 and in front of the imaging surface IMG of the chip imaging assembly. The third lens assembly 30 is provided with a first super lens M1, and the second lens assembly 20 is provided with a second super lens M2. The first lens assembly 10 can be moved along the optical axis for focusing. The first lens assembly 10 includes a plurality of refractive lenses, which are the first lens P1, the second lens P2 and the third lens P3 from the object side to the image side. The first super lens M1 is provided with a micro-nano structure ( Figure 28 The micro-nano structure is omitted due to image size limitations). The second super lens M2 is provided with micro-nano structures on both the object side and the image side. Figure 28The micro-nano structure is omitted due to image size limitations). A stop STO may be provided on the object side of the first lens P1. In Example 5, the first super-lens M1 is provided in the third lens assembly 30 closest to the folding prism G5 and arranged before the light-entering side of the folding prism G5, and the third lens assembly 30 only includes the first super-lens M1; the second super-lens M2 is provided in the second lens assembly 20 arranged after the light-exiting side of the folding prism G5 and before the imaging surface IMG of the chip imaging assembly, and the second lens assembly 20 only includes the second super-lens M2. In other embodiments, the third lens assembly 30 may include at least one refractive lens and a first super-lens M1. In other embodiments, the second lens assembly 20 may include at least one refractive lens and a second super-lens M2. In other embodiments, the ultra-macro telephoto camera module further includes a filter IR, which is provided on the light-entering side and / or the light-exiting side of the folding prism G5. In other embodiments, the superlens M includes a filter film, which is disposed on the object-side surface and / or image-side surface of the substrate of the superlens M. The micro-nano structure of the superlens M may be disposed above the filter film or above the substrate. If the micro-nano structure of the superlens M of this embodiment is disposed above the filter film, a filter film is disposed on the object-side surface and / or image-side surface of the substrate, and the micro-nano structure is disposed above the filter film.

[0130] Please also refer to the following Figure 28 As shown in Table 13, the first lens P1 has positive focal power, its object side surface is convex, and its image side surface is concave. The second lens P2 has positive focal power, its object side surface is convex, and its image side surface is concave. The third lens P3 has positive focal power, its object side surface is convex, and its image side surface is concave. The first super lens M1 has an object side surface and an image side surface. The second super lens M2 has an object side surface and an image side surface. The light from the object first passes through the first lens assembly 10 and the third lens assembly 30 in sequence, specifically the aperture STO, the first lens P1, the second lens P2, the third lens P3 and the first super lens M1; then enters the folding prism G5 through the incident surface, and after multiple reflections inside the folding prism G5, it is emitted through the light output side; then passes through the second lens assembly 20, that is, the second super lens M2, and is projected onto the imaging surface IMG of the chip imaging component.

[0131] Table 13 shows the basic parameters of the ultra-macro telephoto camera module of Example 5, where the units of curvature radius, thickness, focal length and aperture are all millimeters (mm).

[0132] Table 13:

[0133] Table 14 shows the conic coefficients and the coefficients of higher-order terms A4, A6, A8, A10, A12, A14, A16, A18, and A20 when the object side and the image side of the first lens P1 and the second lens P2 used in Example 5 are even aspherical surfaces. Among them, the surface profile of each even aspherical surface is defined by formula (1) given in Example 1 above.

[0134] Table 14:

[0135] Table 15 shows the coefficients C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10 of different-order aberration correction terms of order 1 when micro-nano structures are provided on both the object side and the image side of the first superlens M1 and the second superlens M2 used in Example 5.

[0136] Table 15:

[0137] In Example 5, the system focal length f' of the ultra-macro long-focus camera module is 18.6 mm, the aperture value F# is 2.85, the maximum imaging circle diameter MIC is 7.4 mm, the working wavelength range is 430 - 650 nm, the field angle is 21.4°, and the overall optical length is 21.5 mm. The optical component provided between the light-emitting side of the retroflection prism G5 and the imaging surface IMG of the chip imaging component is the second lens component 20. Since the second lens component 20 only includes the second superlens M2, the thickness CTM of the optical component is the thickness of the second superlens M2, which is 0.11 mm, satisfying 0.1 mm < CTM < 0.4 mm. And the distance BFL from the light-emitting side of the retroflection prism G5 to the imaging surface IMG is 0.10 + 0.11 + 0.65 = 0.86 mm, satisfying 0.8 mm < BFL < 1.05 mm. The focal length EFL2 of the first superlens M1 is 4 mm, and the focal length EFL2 of the second superlens M2 is 7.2 mm, both satisfying 2 mm < EFL2 < 200 mm.

[0138] Figure 29 Shows the MTF curve graph of the ultra-macro long-focus camera module in the near-focus state of Example 5. The MTF (Modulation Transfer Function) curve shows the transmission of the imaging system for image details (i.e., image contrast) of different spatial frequencies. At a macro distance such as 15 cm and a spatial frequency of 240 lp / mm, the OTF modulus is greater than 0.2, indicating good resolution. Figure 30The ray fan diagram of the ultra-macro telephoto camera module of Example 5 is shown. The ray fan diagram generally shows the cross-section of the light beam at different positions, as well as the path and changes of propagation in the optical system. It is a comprehensive evaluation diagram of various aberrations. Its scale is ±20um, that is, the scale range in the horizontal and vertical directions is ±20um. Various aberrations are well corrected and the overall aberration of the system is very small. Figure 31 The field curvature diagram of the ultra-macro telephoto camera module of Example 5 is shown. The field curvature is less than ±0.02mm, and the correction is very good. Figure 32 The distortion diagram of the ultra-macro telephoto camera module of Example 5 is shown. The distortion is less than 2%, and the correction is very good. Figure 33 The relative illumination and actual main ray image height of the periscope fisheye lens of Example 5 are shown. The relative illumination is greater than 60%, and the brightness of the picture is uniform. Figures 29 to 33 It can be seen that the ultra-macro telephoto camera module provided in Example 5 has good resolution in the close focus state, good correction, uniform picture brightness, and can achieve good imaging quality.

[0139] The above description is merely a preferred embodiment of the present application and an illustration 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 the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An ultra-macro telephoto camera module, characterized in that: Comprising at least two lens assemblies, a folding prism, and a chip imaging assembly; The folding prism includes a light incident side and a light exit side, and the folding prism is arranged before the imaging surface of the chip imaging assembly; All of the at least two lens assemblies are arranged before the light incident side of the folding prism; or, at least one lens assembly of the at least two lens assemblies includes a metalens, and at least one of the object side surface and the image side surface of the metalens is provided with a micro-nano structure; at least one lens assembly of the at least two lens assemblies is arranged before the light incident side of the folding prism, and at least one lens assembly of the at least two lens assemblies is arranged after the light exit side of the folding prism and before the imaging surface of the chip imaging assembly.

2. The ultra-macro telephoto camera module according to claim 1, wherein: The at least two lens assemblies include a first lens assembly and a second lens assembly, the first lens assembly is arranged before the light incident side of the folding prism, and the second lens assembly is arranged after the light exit side of the folding prism and before the imaging surface of the chip imaging assembly.

3. The ultra-macro telephoto camera module according to claim 2, wherein: The second lens assembly at least includes a refractive lens and a metalens.

4. The ultra-macro telephoto camera module according to claim 2, wherein: The second lens assembly is only provided with one metalens.

5. The ultra-macro telephoto camera module according to claim 2, wherein: The at least two lens assemblies further include a third lens assembly, the third lens assembly is arranged before the light incident side of the folding prism, the third lens assembly is provided with a first metalens, and the second lens assembly is provided with a second metalens.

6. The ultra-macro telephoto camera module according to claim 2, wherein: Further comprising a filter or a filter film, the filter or the filter film is arranged on the light incident side and / or the light exit side of the folding prism.

7. The ultra-macro telephoto camera module according to claim 1, wherein: All of the at least two lens assemblies are arranged before the light incident side of the folding prism, and the metalens is arranged in at least one lens assembly of the at least two lens assemblies.

8. The ultra-macro telephoto camera module according to claim 1, wherein: The metalens includes a filter film, and the filter film is arranged on the object side surface and / or the image side surface of the substrate of the metalens.

9. The ultra-macro telephoto camera module according to claim 1, wherein: At least one lens assembly of the at least two lens assemblies moves along the optical axis direction for focusing, and the focusing stroke z1 satisfies: 0.15 mm < z1 < 1 mm.

10. The ultra-macro telephoto camera module according to claim 1, wherein: The total height HZ1 from the outermost axial point of the object side surface of the lens closest to the object side among the at least two lens assemblies to the bottom of the folding prism, the total height HZ2 from the bottom of the folding prism to the imaging surface, and the effective focal length EFL of the super-macro long-focus camera module satisfy: HZ1 < 0.7EFL, HZ2 < 0.5EFL.

11. The ultra-macro telephoto camera module according to claim 1, wherein: The thickness CTM of the optical component arranged between the light exit side of the folding prism and the imaging surface of the chip imaging assembly satisfies: 0.1 mm < CTM < 0.4 mm, and the distance BFL from the light exit side of the folding prism to the imaging surface satisfies: 0.8 mm < BFL < 1.05 mm.

12. The ultra-macro telephoto camera module according to claim 1, wherein: The focal length EFL2 of the metalens satisfies: 2 mm < EFL2 < 200 mm.

13. The ultra-macro telephoto camera module according to claim 1, wherein: The total height HT1 from the axial outermost point of the object side of the lens closest to the object side in the at least two lens assemblies to the axial outermost point of the image side of the lens closest to the light entrance side of the return prism, and the total height HZ1 from the axial outermost point of the object side of the lens closest to the object side in the at least two lens assemblies to the bottom of the return prism, satisfy: 0.3 <HT1 / HZ1<0.8。 14. The ultra-macro telephoto camera module according to claim 1, wherein: The total height HT2 from the light-emitting side of the folding prism to the imaging surface, and the total height HZ2 from the bottom of the folding prism to the imaging surface satisfy: 0.1<HT2 / HZ2<0.5.

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