Three-dimensional sensing and receiving optical system and three-dimensional sensing and receiving optical lens

Abstract

The utility model discloses a three-dimensional sensing and receiving optical system and a three-dimensional sensing and receiving optical lens, the three-dimensional sensing and receiving optical system sequentially comprises a first aspheric lens, a folding and super hybrid lens group and a third aspheric lens from an object side to an image side along an optical axis, and the folding and super hybrid lens group comprises a super lens and a second aspheric lens; the focal power of the first aspheric lens is positive, and the object side surface and the image side surface of the first aspheric lens both protrude towards the object side; the focal power of the super lens is positive, the super lens comprises a substrate and a micro-nano structure, and the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the object side surface and the image side surface of the second aspheric lens are convex to the image side; the focal power of the third aspheric lens is negative. The three-dimensional sensing and receiving optical system is good in imaging quality and small in size. In addition, the cost of the three-dimensional sensing and receiving optical system is low, and the cost of the single superlens is low during batch production, so that the cost of the three-dimensional sensing and receiving optical system can be further reduced.

Description

Technical Field

[0001] The present application relates to the field of optical systems, and particularly to a three-dimensional sensing receiving optical system and a three-dimensional sensing receiving optical lens. Background Art

[0002] Currently, 3D detection technology is widely used in various electronic devices. TOF (Time-of-Flight) and structured light are common 3D detection technologies at present.

[0003] If depth information is to be obtained through a three-dimensional sensing receiving optical system, this places high requirements on the three-dimensional sensing receiving optical system, and it is required that the three-dimensional sensing receiving optical system can present a relatively clear and less distorted image. In the prior art, usually, the number of lenses is increased to meet the requirements of the imaging quality of the three-dimensional sensing receiving optical system. However, increasing the number of lenses will cause a significant increase in the cost and volume of the three-dimensional sensing receiving optical system, resulting in a significant increase in the volume and cost of the three-dimensional sensing sensor, making the three-dimensional sensing sensor unable to be widely used in various electronic devices. Summary of the Utility Model

[0004] In view of the above technical problems, the embodiments of the present application provide a three-dimensional sensing receiving optical system and a three-dimensional sensing receiving optical lens, aiming to provide a three-dimensional sensing receiving optical system and a three-dimensional sensing receiving optical lens with excellent imaging quality, small volume and low cost.

[0005] According to one aspect of the embodiments of the present application, a three-dimensional sensing receiving optical system is disclosed. The three-dimensional sensing receiving optical system sequentially includes, along the optical axis from the object side to the image side: a first aspherical lens, a refractive-diffractive hybrid lens group, and a third aspherical lens. The refractive-diffractive hybrid lens group includes: a diffractive lens and a second aspherical lens; the optical power of the first aspherical lens is positive, the object side surface of the first aspherical lens bulges toward the object side, and the image side surface of the first aspherical lens bulges toward the object side; the optical power of the diffractive lens is positive, the diffractive lens includes: a substrate and a micro-nano structure, and the micro-nano structure is disposed on the object side surface and / or the image side surface of the substrate; the object side surface of the second aspherical lens bulges toward the image side, and the image side surface of the second aspherical lens bulges toward the image side; the optical power of the third aspherical lens is negative.

[0006] In some embodiments, the diffractive lens and the second aspherical lens are sequentially arranged along the optical axis from the object side to the image side.

[0007] In some embodiments, the second aspherical lens and the diffractive lens are sequentially arranged along the optical axis from the object side to the image side.

[0008] In some embodiments, the 3D sensing receiving optical system satisfies: where f is the effective focal length of the 3D sensing receiving optical system, f1 is the focal length of the first aspherical lens, f2 is the focal length of the second aspherical lens, f3 is the focal length of the third aspherical lens, and f m is the focal length of the metalens.

[0009] In some embodiments, the 3D sensing receiving optical system satisfies: where V1 is the Abbe number of the material of the first aspherical lens, V2 is the Abbe number of the material of the second aspherical lens, V3 is the Abbe number of the material of the third aspherical lens, and V m is the Abbe number of the material of the metalens.

[0010] In some embodiments, the 3D sensing receiving optical system satisfies: where Sag 21 is the distance between the first point and the second point on the optical axis. The first point is the intersection of the object side surface of the second aspherical lens and the optical axis, and the second point is the point where the maximum effective diameter of the object side surface of the second aspherical lens is located. If the second point is on the object side of the first point, then Sag 21 is negative. If the second point is on the image side of the first point, then Sag 21 is positive; R 21 is the curvature radius of the object side surface of the second aspherical lens.

[0011] In some embodiments, the 3D sensing receiving optical system satisfies: where R 21 is the curvature radius of the object side surface of the second aspherical lens, and R 22 is the curvature radius of the image side surface of the second aspherical lens.

[0012] In some embodiments, the 3D sensing receiving optical system satisfies: where ∑CT is the sum of the central thicknesses of the first aspherical lens, the second aspherical lens, the third aspherical lens, and the metalens, and ∑AT is the sum of the thicknesses of the air gaps between any two adjacent lenses on the optical axis.

[0013] In some embodiments, the 3D sensing receiving optical system satisfies: Wherein, D1 is the effective diameter of the first lens along the optical axis from the object side to the image side, D2 is the effective diameter of the second lens along the optical axis from the object side to the image side, D3 is the effective diameter of the third lens along the optical axis from the object side to the image side, D4 is the effective diameter of the fourth lens along the optical axis from the object side to the image side, ImgH is the radius of the imaging area corresponding to the maximum half field of view angle on the image plane of the three-dimensional sensing receiving optical system, TTL is the total optical length, and FNO is the f-number of the three-dimensional sensing receiving optical system.

[0014] In some embodiments, the three-dimensional sensing receiving optical system further includes a diaphragm, and the diaphragm is disposed on the object side of the first aspherical lens; alternatively, the diaphragm is disposed between any two adjacent lenses.

[0015] A second aspect of the embodiments of the present application provides a three-dimensional sensing receiving optical lens, which includes: an imaging detector and the three-dimensional sensing receiving optical system as described in any one of the above; the imaging detector is disposed on the image plane of the three-dimensional sensing receiving optical system.

[0016] The three-dimensional sensing receiving optical system provided by the present application sequentially includes, along the optical axis from the object side to the image side: a first aspherical lens, a refractive-diffractive hybrid lens group, and a third aspherical lens. The refractive-diffractive hybrid lens group includes: a diffractive lens and a second aspherical lens; the first aspherical lens has a positive optical power, the object side surface of the first aspherical lens bulges towards the object side, and the image side surface of the first aspherical lens bulges towards the object side; the diffractive lens has a positive optical power, and the diffractive lens includes: a substrate and a micro-nano structure, and the micro-nano structure is disposed on the object side surface and / or the image side surface of the substrate; the object side surface of the second aspherical lens bulges towards the image side, and the image side surface of the second aspherical lens bulges towards the image side; the third aspherical lens has a negative optical power. The imaging quality of the three-dimensional sensing receiving optical system is better, and the total optical length of the three-dimensional sensing receiving optical system is shorter. Therefore, its volume is smaller. The number of lenses in the three-dimensional sensing receiving optical system is relatively small, which makes the cost of the three-dimensional sensing receiving optical system lower. Moreover, the cost of a single diffractive lens is lower during mass production, which can further compress the cost of the three-dimensional sensing receiving optical system. Description of the Drawings

[0017] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other objectives, features, and advantages of the present application will become more apparent.

[0018] Figure 1 The schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system in an embodiment of the present application is shown.

[0019] Figure 2Shows the MTF field of view curve graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0020] Figure 3 Shows the field curvature graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0021] Figure 4 Shows the distortion graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0022] Figure 5 Shows the schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0023] Figure 6 Shows the MTF field of view curve graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0024] Figure 7 Shows the field curvature graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0025] Figure 8 Shows the distortion graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0026] Figure 9 Shows the schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0027] Figure 10 Shows the MTF field of view curve graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0028] Figure 11 Shows the field curvature graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0029] Figure 12 Shows the distortion graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0030] Figure 13 Shows the schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0031] Figure 14 Shows the MTF field of view curve graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0032] Figure 15 Shows the field curvature graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0033] Figure 16 Shows the distortion graph of the three-dimensional sensing receiving optical system in an embodiment of the present application.

[0034] Reference numerals

[0035] 100, Three - dimensional sensing receiving optical system;

[0036] 10, First aspherical lens;

[0037] 20, Folded - super hybrid lens group; 210, Super lens; 2110, Substrate; 2120, Micro - nano structure; 220, Second aspherical lens;

[0038] 30, Third aspherical lens;

[0039] 40, Diaphragm;

[0040] 50, Protective glass;

[0041] A, Object plane; B, Image plane; S, Optical axis. Detailed implementation manners

[0042] Now, the example embodiments will be described more comprehensively with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more complete and thorough, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic diagrams of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0043] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more example embodiments. In the following description, many specific details are provided to give a thorough understanding of the example embodiments of the present application. However, those skilled in the art will realize that one or more of the specific details can be omitted while practicing the technical solutions of the present application, or other modules, components, etc. can be used. In other cases, well - known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring the aspects of the present application.

[0044] Please refer to Figure 1 , Figure 1 , which shows a schematic diagram of the architecture layout of the three - dimensional sensing receiving optical system 100 in an embodiment of the present application. Among them, the optical axis S is the center line of the light beam. In Figure 1 , the object is located on the left side of the left - most lens, that is, the object side is on the left side of the left - most lens, and the object plane A is on the object side. The image formed by the three - dimensional sensing receiving optical system 100 is located on the right side of the right - most lens, that is, the image side is on the right side of the right - most lens, and the image plane B is on the image side. Therefore, the direction from the object plane A to the image plane B along the optical axis S is the same as the direction from the object side to the image side along the optical axis S.

[0045] For each optical element of the three-dimensional sensing receiving optical system 100, the side closer to the object side is the object side of the corresponding optical element, and the side closer to the image side is the image side of the corresponding optical element. For example, the side of the aperture stop 40 closer to the object side is the object side of the aperture stop 40. The surface of each optical element of the three-dimensional sensing receiving optical system 100 closer to the object side is the object side surface of the corresponding optical element, and the surface of each optical element of the three-dimensional sensing receiving optical system 100 closer to the image side is the image side surface of the corresponding optical element. For example, the surface of the aperture stop 40 closer to the image side is the image side surface of the aperture stop 40.

[0046] The three-dimensional sensing receiving optical system 100 includes: a first aspherical lens 10, a refractive-diffractive hybrid lens group 20, and a third aspherical lens 30. The first aspherical lens 10, the refractive-diffractive hybrid lens group 20, and the third aspherical lens 30 are arranged in sequence along the optical axis S from the object side to the image side. The refractive-diffractive hybrid lens group 20 includes: a diffractive lens 210 and a second aspherical lens 220. The order of the diffractive lens 210 and the second aspherical lens 220 along the optical axis S from the object side to the image side is not fixed.

[0047] The optical power of the first aspherical lens 10 is positive. The object side surface of the first aspherical lens 10 bulges towards the object side, and the image side surface of the first aspherical lens 10 bulges towards the object side.

[0048] The optical power of the diffractive lens 210 is positive. The diffractive lens 210 includes: a substrate 2110 and a micro-nano structure 2120. The micro-nano structure 2120 is disposed on the object side surface and / or the image side surface of the substrate 2110. According to the adopted phase modulation method, the corresponding phase modulation formula can be adaptively used to configure the parameters of the micro-nano structure 2120, so that the diffractive lens 210 has the expected optical performance.

[0049] The optical power of the second aspherical lens 220 can be positive or negative. The object side surface of the second aspherical lens 220 bulges towards the image side, and the image side surface of the second aspherical lens 220 bulges towards the image side.

[0050] The optical power of the third aspherical lens 30 is negative.

[0051] The three-dimensional sensing receiving optical system 100 provided by the present application has better imaging quality and shorter overall optical length. Therefore, its volume is smaller. The number of lenses of the three-dimensional sensing receiving optical system 100 is relatively small, making the cost of the three-dimensional sensing receiving optical system 100 lower. Moreover, the cost of a single diffractive lens 210 is lower during mass production, which can further reduce the cost of the three-dimensional sensing receiving optical system 100.

[0052] Please refer to Figure 1 、 Figure 5 and Figure 9, in some embodiments, the metalens 210 and the second aspherical lens 220 are sequentially arranged along the optical axis S from the object side to the image side. That is, in this case, the first aspherical lens 10, the metalens 210, the second aspherical lens 220, and the third aspherical lens 30 are sequentially arranged along the optical axis S from the object side to the image side.

[0053] Please refer to Figure 13 , in some embodiments, the second aspherical lens 220 and the metalens 210 are sequentially arranged along the optical axis S from the object side to the image side. That is, in this case, the first aspherical lens 10, the second aspherical lens 220, the metalens 210, and the third aspherical lens 30 are sequentially arranged along the optical axis S from the object side to the image side.

[0054] In some embodiments, the optical power of the second aspherical lens 220 is positive.

[0055] In some other embodiments, the optical power of the second aspherical lens 220 is negative.

[0056] Please refer to Figure 1 , Figure 9 and Figure 13 , in some embodiments, the object side surface of the third aspherical lens 30 bulges towards the image side, and the paraxial region of the object side surface of the third aspherical lens 30 has an inflection point; the image side surface of the third aspherical lens 30 bulges towards the image side, and the paraxial region of the image side surface of the third aspherical lens 30 has an inflection point. In the present application, the "paraxial region" refers to the region enclosed by a preset length with the optical axis S as the central axis.

[0057] Please refer to Figure 5 , in some embodiments, the object side surface of the third aspherical lens 30 bulges towards the image side; the image side surface of the third aspherical lens 30 bulges towards the image side, and the paraxial region of the image side surface of the third aspherical lens 30 has an inflection point.

[0058] In some embodiments, the micro-nano structure 2120 is disposed on the object side surface of the substrate 2110.

[0059] In some embodiments, the micro-nano structure 2120 is disposed on the image side surface of the substrate 2110.

[0060] In some embodiments, the micro-nano structure 2120 is disposed on both the object side surface and the image side surface of the substrate 2110, so that the metalens 210 has a higher design freedom.

[0061] In some embodiments, the micro-nano structure 2120 is a positive micro-nano structure.

[0062] In some embodiments, the micro-nano structure 2120 is a negative micro-nano structure.

[0063] In some embodiments, the micro-nano structure 2120 is provided with a single layer to make the manufacturing process of the metalens 210 compatible with the existing semiconductor manufacturing process, facilitating the manufacturing of the metalens 210.

[0064] In some embodiments, the micro-nano structure 2120 is provided with two or more layers to endow the metalens 210 with a large and desired optical power.

[0065] For the metalens 210, the surface or surfaces of the substrate 2110 on which the micro-nano structure 2120 is disposed, the positive or negative nature of the micro-nano structure 2120, and the number of layers of the micro-nano structure 2120 can be freely combined, as long as the metalens 210 has the desired performance.

[0066] In some embodiments, the phase distribution of the metalens 210 satisfies the following formula:

[0067]

[0068] where r is the distance between the center of the surface of the metalens 210 on which the micro-nano structure 2120 is provided and any point on the surface of the metalens 210 on which the micro-nano structure 2120 is provided, λ is the central wavelength of the working band of the metalens 210, is the phase constant, (x, y) are the two-dimensional coordinates of the surface of the metalens 210, a i 、b i 、a ij 、b ij are all real coefficients, N is the number of phase coefficient terms, and f m is the focal length of the metalens 210.

[0069] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies Condition 1: where f is the effective focal length of the three-dimensional sensing receiving optical system 100, f1 is the focal length of the first aspherical lens 10, f2 is the focal length of the second aspherical lens 220, f3 is the focal length of the third aspherical lens 30, and f m is the focal length of the metalens 210. f, f1, f2, f3, and f m have the same dimension, which is a length unit, such as millimeters.

[0070] The significance of Condition 1 is to reasonably distribute the optical powers of the first aspherical lens 10, the metalens 210, the second aspherical lens 220, and the third aspherical lens 30, making the structure of the three-dimensional sensing receiving optical system 100 more reasonable and conducive to improving the imaging quality of the three-dimensional sensing receiving optical system 100.

[0071] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies Condition 2: Wherein, V1 is the Abbe number of the material of the first aspherical lens 10, V2 is the Abbe number of the material of the second aspherical lens 220, V3 is the Abbe number of the material of the third aspherical lens 30, and V m is the Abbe number of the material of the metalens 210.

[0072] Conditional formula two indicates the dispersion ability of the lens materials in the three-dimensional sensing receiving optical system 100. Conditional formula two is used to ensure that the metalens 210 has a stronger dispersion adjustment ability in the three-dimensional sensing receiving optical system 100. At the same time, conditional formula two can also prevent the metalens 210 from having insufficient light modulation ability due to too small optical power in the three-dimensional sensing receiving optical system 100. Moreover, on the premise of satisfying conditional formula two, using a material with a higher refractive index is beneficial to reducing the thickness of the lens and can reduce the volume of the three-dimensional sensing receiving optical system 100.

[0073] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies conditional formula three: Wherein, Sag 21 is the distance between the first point and the second point on the optical axis S, that is, Sag 21 is the projection length of the line connecting the first point and the second point on the optical axis S. The first point is the intersection of the object side of the second aspherical lens 220 and the optical axis S, and the second point is the point where the maximum effective diameter of the object side of the second aspherical lens 220 is located. Among them, the maximum effective diameter of the object side of the second aspherical lens 220 refers to the maximum light passing area of the object side of the second aspherical lens 220. If the second point is located on the object side of the first point, Sag 21 is negative; if the second point is located on the image side of the first point, Sag 21 is positive. R 21 is the curvature radius of the object side of the second aspherical lens 220, and R 21 and Sag 21 have the same dimension, both are length units, such as millimeters.

[0074] The upper limit of conditional formula three can prevent the shape of the second aspherical lens from being too curved, which is beneficial to the fabrication and molding of the second aspherical lens. The lower limit of conditional formula three can ensure that the second aspherical lens 220 has sufficient ability to adjust the light deflection angle of different fields of view, which is beneficial to controlling the distortion of the three-dimensional sensing receiving optical system 100, so as to ensure that the incident light beam at a large field of view angle can reach the preset image height.

[0075] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies conditional formula four: Wherein, R 21 is the curvature radius of the object side of the second aspherical lens 220, and R 22 is the curvature radius of the image side of the second aspherical lens 220. R21 and R 22 have the same dimension, both being length units, such as millimeters.

[0076] Conditional formula four is conducive to correcting the astigmatism of the three-dimensional sensing receiving optical system 100, and thus can improve the imaging quality of the three-dimensional sensing receiving optical system 100. At the same time, conditional formula four is conducive to controlling the deflection angle of light under a large field of view, and thus can improve the relative illumination of the three-dimensional sensing receiving optical system 100.

[0077] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies conditional formula five: Wherein, ∑CT is the sum of the central thicknesses of the first aspherical lens 10, the second aspherical lens 220, the third aspherical lens 30, and the metalens 210. In this application, the central thickness of a lens refers to the thickness of the lens on the optical axis S. ∑AT is the sum of the thicknesses of the air gaps between any two adjacent lenses on the optical axis S. Specifically, along the optical axis S from the object side to the image side, the thickness of the air gap between the first lens and the second lens on the optical axis S is the first thickness, the thickness of the air gap between the second lens and the third lens on the optical axis S is the second thickness, and the thickness of the air gap between the third lens and the fourth lens on the optical axis S is the third thickness. ∑AT is equal to the sum of the first thickness, the second thickness, and the third thickness. ∑CT and ∑AT have the same dimension, both being length units, such as millimeters.

[0078] An interval element (not shown in the figure) is usually provided between two adjacent lenses to control the interval between the lenses. The upper limit of conditional formula five can control the size of the interval element to intercept stray light. The lower limit of conditional formula five can ensure that the three-dimensional sensing receiving optical system 100 has a relatively compact structure and can compress the volume of the three-dimensional sensing receiving optical system 100 to the greatest extent.

[0079] In some embodiments, the three-dimensional sensing receiving optical system 100 satisfies conditional formula six: Wherein, D1 is the effective diameter of the first lens in the direction from the object side to the image side along the optical axis S, that is, D1 is the effective diameter of the first aspherical lens 10. D2 is the effective diameter of the second lens in the direction from the object side to the image side along the optical axis S, D3 is the effective diameter of the third lens in the direction from the object side to the image side along the optical axis S, and D4 is the effective diameter of the fourth lens in the direction from the object side to the image side along the optical axis S, that is, D4 is the effective diameter of the third aspherical lens 30. In the present application, the effective diameter of a lens refers to the diameter of the largest light-transmitting area of the lens. ImgH is the radius of the imaging area corresponding to the maximum half field of view angle on the image plane B of the three-dimensional sensing receiving optical system 100, and TTL (Total Track Length, abbreviated as TTL) is the total optical length. FNO is the f-number of the three-dimensional sensing receiving optical system 100, that is, the F-number. D1, D2, D3, D4, ImgH, and TTL have the same dimension, all of which are length units, such as millimeters.

[0080] The upper limit of conditional formula six can ensure the relative illuminance of the three-dimensional sensing receiving optical system 100 at large angles. At the same time, the upper limit of conditional formula six can ensure that the three-dimensional sensing receiving optical system 100 has a small distortion on the premise of excellent imaging quality. Moreover, the upper limit of conditional formula six can also ensure that the three-dimensional sensing receiving optical system 100 has the advantage of miniaturization. The lower limit of conditional formula six is conducive to controlling the incident angle of light on each lens, and can avoid too large incident angles. If the incident angle is too large, it will lead to the problem of low light transmittance.

[0081] The three-dimensional sensing receiving optical system 100 further includes a diaphragm 40, and the diaphragm 40 is used to control the light incident amount of the three-dimensional sensing receiving optical system 100 to ensure that the three-dimensional sensing receiving optical system 100 can effectively work and generate high-quality images.

[0082] In some embodiments, the diaphragm 40 is disposed on the object side of the first aspherical lens 10. Specifically, the position where the diaphragm 40 is disposed satisfies any one of the following conditions:

[0083] (1) The diaphragm 40 is located on the object side of the first aspherical lens 10, and the diaphragm 40 is spaced from the first aspherical lens 10.

[0084] (2) The diaphragm 40 is located on the object side of the first aspherical lens 10, and the diaphragm 40 is disposed in contact with the object side surface of the first aspherical lens 10.

[0085] In some embodiments, the diaphragm 40 is disposed between any two adjacent lenses. Specifically, when the first aspherical lens 10, the meta-lens 210, the second aspherical lens 220, and the third aspherical lens 30 are sequentially disposed in the direction from the object side to the image side along the optical axis S, the position where the diaphragm 40 is disposed satisfies any one of the following conditions:

[0086] (1) The aperture 40 is located between the first aspherical lens 10 and the metalens 210, and the aperture 40 is disposed in contact with the image side surface of the first aspherical lens 10;

[0087] (2) The aperture 40 is located between the first aspherical lens 10 and the metalens 210, and the aperture 40 is spaced apart from both the first aspherical lens 10 and the metalens 210;

[0088] (3) The aperture 40 is located between the first aspherical lens 10 and the metalens 210, and the aperture 40 is disposed in contact with the object side surface of the metalens 210;

[0089] (4) The aperture 40 is located between the metalens 210 and the second aspherical lens 220, and the aperture 40 is disposed in contact with the image side surface of the metalens 210;

[0090] (5) The aperture 40 is located between the metalens 210 and the second aspherical lens 220, and the aperture 40 is spaced apart from both the metalens 210 and the second aspherical lens 220;

[0091] (6) The aperture 40 is located between the metalens 210 and the second aspherical lens 220, and the aperture 40 is disposed in contact with the object side surface of the second aspherical lens 220;

[0092] (7) The aperture 40 is located between the second aspherical lens 220 and the third aspherical lens 30, and the aperture 40 is disposed in contact with the image side surface of the second aspherical lens 220;

[0093] (8) The aperture 40 is located between the second aspherical lens 220 and the third aspherical lens 30, and the aperture 40 is spaced apart from both the second aspherical lens 220 and the third aspherical lens 30;

[0094] (9) The aperture 40 is located between the second aspherical lens 220 and the third aspherical lens 30, and the aperture 40 is disposed in contact with the object side surface of the third aspherical lens 30.

[0095] In some embodiments, the aperture 40 is disposed between any two adjacent lenses. Specifically, when the first aspherical lens 10, the second aspherical lens 220, the metalens 210, and the third aspherical lens 30 are sequentially arranged along the optical axis S from the object side to the image side, the position where the aperture 40 is disposed satisfies any one of the following conditions:

[0096] (1) The aperture 40 is located between the first aspherical lens 10 and the second aspherical lens 220, and the aperture 40 is disposed in contact with the image side surface of the first aspherical lens 10;

[0097] (2) The aperture stop 40 is located between the first aspherical lens 10 and the second aspherical lens 220, and the aperture stop 40 is spaced apart from both the first aspherical lens 10 and the second aspherical lens 220;

[0098] (3) The aperture stop 40 is located between the first aspherical lens 10 and the second aspherical lens 220, and the aperture stop 40 is disposed in contact with the object side surface of the second aspherical lens 220;

[0099] (4) The aperture stop 40 is located between the second aspherical lens 220 and the metalens 210, and the aperture stop 40 is disposed in contact with the image side surface of the second aspherical lens 220;

[0100] (5) The aperture stop 40 is located between the second aspherical lens 220 and the metalens 210, and the aperture stop 40 is spaced apart from both the second aspherical lens 220 and the metalens 210;

[0101] (6) The aperture stop 40 is located between the second aspherical lens 220 and the metalens 210, and the aperture stop 40 is disposed in contact with the object side surface of the metalens 210;

[0102] (7) The aperture stop 40 is located between the metalens 210 and the third aspherical lens 30, and the aperture stop 40 is disposed in contact with the image side surface of the metalens 210;

[0103] (8) The aperture stop 40 is located between the metalens 210 and the third aspherical lens 30, and the aperture stop 40 is spaced apart from both the metalens 210 and the third aspherical lens 30;

[0104] (9) The aperture stop 40 is located between the metalens 210 and the third aspherical lens 30, and the aperture stop 40 is disposed in contact with the image side surface of the third aspherical lens 30.

[0105] In some embodiments, the 3D sensing receiving optical system 100 further includes a protective glass 50. The protective glass 50 is located between the third aspherical lens 30 and the image plane B, and the protective glass 50 is disposed close to the image plane B. The protective glass 50 is used to protect the imaging detector corresponding to the 3D sensing receiving optical system 100 to reduce the probability of damage to the imaging detector.

[0106] In some embodiments, the 3D sensing receiving optical system 100 further includes a filter (not shown in the figure). The filter is disposed at any position in the optical path of the 3D sensing receiving optical system 100. The working band of the 3D sensing receiving optical system 100 is near-infrared light. The filter can transmit near-infrared light, and the filter blocks light of other bands except the working band from passing through itself to achieve the filtering effect.

[0107] The 3D sensing receiving optical system 100 provided in this application has the following advantages:

[0108] (1) The total optical length ≤ 2.22 mm;

[0109] (2) The MTF (Modulation Transfer Function) within a 0.8 field of view at a cut-off frequency of 125 lp / mm is greater than 0.4;

[0110] (3) The absolute value of the maximum distortion is less than 2%;

[0111] (4) The maximum field of view angle (2ω) is greater than 78°.

[0112] Exemplarily, this application provides four three-dimensional sensing receiving optical systems 100 that meet the usage requirements in four embodiments. Next, a detailed introduction to the three-dimensional sensing receiving optical systems 100 provided in each embodiment of this application will be given.

[0113] Embodiment 1

[0114] Figure 1 Shows a schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1. Figure 1 The three-dimensional sensing receiving optical system 100 along the optical axis S from the object plane A to the image plane B successively includes: a diaphragm 40, a first aspherical lens 10, a metalens 210, a second aspherical lens 220, a third aspherical lens 30, and a protective glass 50. Among them, the micro-nano structure 2120 is located on the image side of the substrate 2110. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1 are shown in Table 1-1.

[0115] Table 1-1. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1

[0116]

[0117]

[0118] As can be seen from Table 1-1, the working wavelength band of the three-dimensional sensing receiving optical system 100 is from 920 nm to 960 nm. The total optical length of the three-dimensional sensing receiving optical system 100 is relatively short, only 2.214 mm. Therefore, the volume of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1 is relatively small. The maximum field of view angle of the three-dimensional sensing receiving optical system 100 is 78.2°, and the field of view is relatively large. The F number of the three-dimensional sensing receiving optical system 100 is 1.77, which can greatly improve the light input of the three-dimensional sensing receiving optical system 100 and collect as much energy entering the three-dimensional sensing receiving optical system 100 as possible when the image sensor has a low response to light energy, thereby ensuring excellent imaging quality.

[0119] Along the optical axis S from the object surface A to the image surface B direction, starting from the aperture 40, each surface in the three-dimensional sensing and receiving optical system 100 is numbered, and after summarizing the parameters of each surface, the following Table 1-2 is obtained.

[0120] Table 1-2. Parameters of each surface in the three-dimensional sensing and receiving optical system 100 provided in Embodiment 1

[0121] Surface Serial Number Surface Type Radius of Curvature (mm) Thickness (mm) Refractive Index and Abbe Number 1 Diaphragm Infinity -0.168 - 2 Even Asphere 0.775 0.287 1.67,19.3 3 Even Asphere 1.753 0.095 - 4 Sphere Infinity 0.300 1.46,67.8 5 Structural Surface Infinity 0.273 - 6 Even Asphere -0.955 0.357 1.67,19.3 7 Even Asphere -0.529 0.049 - 8 Even Asphere 10.544 0.244 1.67,19.3 9 Even Asphere 0.728 0.299 - 10 Sphere Infinity 0.210 1.52,54.5 11 Sphere Infinity 0.100 - 12 Image Plane Infinity - -

[0122] For each surface in Table 1-2, surface 1 is the aperture 40, surface 2 is the object side surface of the first aspherical lens 10, and surface 3 is the image side surface of the first aspherical lens 10. Surface 4 is the object side surface of the superlens 210, surface 5 is the image side surface of the superlens 210. Since the micro-nano structure 2120 is located on the image side surface of the superlens 210, surface 5 is denoted as the structured surface. Surface 6 is the object side surface of the second aspherical lens 220, and surface 7 is the image side surface of the second aspherical lens 220. Surface 8 is the object side surface of the third aspherical lens 30, and surface 9 is the image side surface of the third aspherical lens 30. Surface 10 is the object side surface of the protective glass 50, and surface 11 is the image side surface of the protective glass 50. Surface 12 is the image surface B.

[0123] As can be seen from Table 1-2, the radius of curvature of Surface 1 is infinite, that is, Surface 1 is a plane. The distance between Surface 1 and Surface 2 is -0.168 mm. Here, the negative sign in "-0.168" means that Surface 2 protrudes towards the object side from Surface 1, and the material between Surface 1 and Surface 2 is air. Surface 2 is an even aspheric surface, the radius of curvature of Surface 2 is 0.775 mm, the distance between Surface 2 and Surface 3 is 0.287 mm, and the refractive index and Abbe number of the material between Surface 2 and Surface 3 are 1.67 and 19.3 respectively. Surface 3 is an even aspheric surface, the radius of curvature of Surface 3 is 1.753 mm, the distance between Surface 3 and Surface 4 is 0.095 mm, and the material between Surface 3 and Surface 4 is air. The radius of curvature of Surface 4 is infinite, that is, Surface 4 is a plane. The distance between Surface 4 and Surface 5 is 0.300 mm, and the refractive index and Abbe number of the material between Surface 4 and Surface 5 are 1.46 and 67.8 respectively. The radius of curvature of Surface 5 is infinite, that is, Surface 5 is a plane. The distance between Surface 5 and Surface 6 is 0.273 mm, and the material between Surface 5 and Surface 6 is air. Surface 6 is an even aspheric surface, the radius of curvature of Surface 6 is -0.955 mm, the distance between Surface 6 and Surface 7 is 0.357 mm, and the refractive index and Abbe number of the material between Surface 6 and Surface 7 are 1.67 and 19.3 respectively. Surface 7 is an even aspheric surface, the radius of curvature of Surface 7 is -0.529 mm, the distance between Surface 7 and Surface 8 is 0.049 mm, and the material between Surface 7 and Surface 8 is air. Surface 8 is an even aspheric surface, the radius of curvature of Surface 8 is 10.544 mm, the distance between Surface 8 and Surface 9 is 0.244 mm, and the refractive index and Abbe number of the material between Surface 8 and Surface 9 are 1.67 and 19.3 respectively. Surface 9 is an even aspheric surface, the radius of curvature of Surface 9 is 0.728 mm, the distance between Surface 9 and Surface 10 is 0.299 mm, and the material between Surface 9 and Surface 10 is air. The radius of curvature of Surface 10 is infinite, that is, Surface 10 is a plane. The distance between Surface 10 and Surface 11 is 0.210 mm, and the refractive index and Abbe number of the material between Surface 10 and Surface 11 are 1.52 and 54.5 respectively. The radius of curvature of Surface 11 is infinite, that is, Surface 11 is a plane. The distance between Surface 11 and Surface 12 is 0.100 mm, and the material between Surface 11 and Surface 12 is air.

[0124] Surfaces 2, 3, 6, 7, 8 and 9 are all even aspheric surfaces, and their surface profiles satisfy the following relationship:

[0125]

[0126] Among them, Z(r) is the distance sagitta from the vertex of the aspheric surface to the position at height r along the optical axis S direction of the aspheric surface; c is the surface curvature of the aspheric surface, c = 1 / R, and R is the radius of curvature of the aspheric surface; k is the conic coefficient; A, B, C, D... are the aspheric coefficients. The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be obtained by querying Table 1-3.

[0127] Table 1-3. Coefficients of each order of even aspheric surfaces in the three-dimensional sensing receiving optical system 100 provided in Embodiment 1

[0128]

[0129] Please refer to Table 1-3. For surface 2, k is -6.53E+00, A is 1.42E+00, B is 1.55E+00, C is -3.94E+01, D is 1.62E+02, E is 3.07E+02, and F is -3.49E+03. The coefficients of each order of even aspheric surfaces of surfaces 3, 6, 7, 8, and 9 can be obtained by querying Table 1-3 with reference to surface 2, and will not be elaborated here one by one.

[0130] Please refer to Figure 2 , Figure 2 which shows the MTF field curve diagram of the iTOF three-dimensional sensing receiving optical system 100 provided in Embodiment 1. Figure 2 The horizontal axis in Figure 2 is the image height, and its unit is millimeter, that is, Figure 2 the horizontal axis in Figure 2 measures the field of view with the image height; Figure 2 The vertical axis in

[0131] Please refer to Figure 3 , Figure 3 which shows the field curvature diagram of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1. Figure 3 The horizontal axis in Figure 3 is the field curvature, and its unit is millimeter; Figure 3Among them, S1 is the field curvature of the near-infrared light with a wavelength of 920 nm in the sagittal direction, and T1 is the field curvature of the near-infrared light with a wavelength of 920 nm in the meridional direction; S2 is the field curvature of the near-infrared light with a wavelength of 940 nm in the sagittal direction, and T2 is the field curvature of the near-infrared light with a wavelength of 940 nm in the meridional direction; S3 is the field curvature of the near-infrared light with a wavelength of 960 nm in the sagittal direction, and T3 is the field curvature of the near-infrared light with a wavelength of 960 nm in the meridional direction. From Figure 3 It can be seen that for the three-dimensional sensing receiving optical system 100 under the near-infrared light with a wavelength of 940 nm, the maximum field curvature in the sagittal direction is 0.050 mm, and the maximum field curvature of the three-dimensional sensing receiving optical system 100 in the meridional direction is 0.092 mm, meeting the requirements for field curvature in the excellent imaging quality standard.

[0132] Please refer to Figure 4 , Figure 4 which shows the distortion diagrams of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1 under the near-infrared light of 920 nm, 940 nm, and 960 nm. Since the distortion curves of the near-infrared light of 920 nm, 940 nm, and 960 nm almost completely overlap, therefore, the three curves are not distinguished in this embodiment. From Figure 4 It can be seen that the maximum distortion of the three-dimensional sensing receiving optical system 100 provided in Embodiment 1 is -0.85%, and the distortion is small, meeting the requirements for distortion in the excellent imaging quality standard.

[0133] Embodiment 2

[0134] Figure 5 shows a schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2. Figure 5 In it, the three-dimensional sensing receiving optical system 100 along the optical axis S from the object plane A to the image plane B sequentially includes: a diaphragm 40, a first aspherical lens 10, a metalens 210, a second aspherical lens 220, a third aspherical lens 30, and a protective glass 50. Among them, the micro-nano structure 2120 is located on the object side of the substrate 2110. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2 are shown in Table 2-1.

[0135] Table 2-1. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2

[0136] Parameter Data Total Track Length (TTL) 2.218mm Maximum Field Angle (2ω) 78.4° F Number 1.90 Effective Focal Length 1.73mm Working Wavelength Band Near Infrared (920nm - 960nm)

[0137] As can be seen from Table 2-1, the operating wavelength band of the 3D sensing receiving optical system 100 is from 920 nm to 960 nm. The total optical length of the 3D sensing receiving optical system 100 is relatively short, only 2.218 mm. Therefore, the volume of the 3D sensing receiving optical system 100 provided in Embodiment 2 is relatively small. The maximum field of view angle of the 3D sensing receiving optical system 100 is 78.4°, and the field of view is relatively large. The F number of the 3D sensing receiving optical system 100 is 1.90, which can greatly increase the amount of incident light of the 3D sensing receiving optical system 100, and can collect as much energy entering the 3D sensing receiving optical system 100 as possible when the image sensor has a low response to light energy, thereby ensuring excellent imaging quality.

[0138] Along the optical axis S from the object plane A to the image plane B, starting from the aperture stop 40, each surface in the 3D sensing receiving optical system 100 is numbered, and after summarizing the parameters of each surface, the following Table 2-2 is obtained.

[0139] Table 2-2. Parameters of each surface in the 3D sensing receiving optical system 100 provided in Embodiment 2

[0140] Surface Serial Number Surface Type Radius of Curvature (mm) Thickness (mm) Refractive Index and Abbe Number 1 Diaphragm Infinity -0.138 - 2 Even Asphere 0.814 0.280 1.67,19.3 3 Even Asphere 2.056 0.100 - 4 Structural Surface Infinity 0.300 1.46,67.8 5 Sphere Infinity 0.238 - 6 Even Asphere -1.087 0.343 1.67,19.3 7 Even Asphere -0.542 0.050 - 8 Even Asphere -9.932 0.290 1.67,19.3 9 Even Asphere 0.784 0.307 - 10 Sphere Infinity 0.210 1.52,54.5 11 Sphere Infinity 0.100 - 12 Image Plane Infinity - -

[0141] For the analysis of each surface in Table 2-2, reference can be made to Embodiment 1, and this embodiment will not analyze it again.

[0142] Surfaces 2, 3, 6, 7, 8, and 9 are all even aspherical surfaces, and their surface shapes satisfy the following relational formula:

[0143]

[0144] Among them, Z(r) is the distance sag from the vertex of the aspherical surface at the position with height r along the optical axis S direction; c is the surface curvature of the aspherical surface, c = 1 / R, and R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are the aspherical coefficients. The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be queried from Table 2-3.

[0145] Table 2-3. Coefficients of each order of the even aspherical surfaces in the 3D sensing receiving optical system 100 provided in Embodiment 2

[0146]

[0147] The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be queried from Table 2-3, and this embodiment will not elaborate one by one.

[0148] Please refer to Figure 6 ,Figure 6 shows the MTF field of view curve graph of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2, Figure 6 where the horizontal axis in it is the image height, and its unit is millimeter, that is, Figure 6 the horizontal axis in it measures the field of view with the image height; Figure 6 the vertical axis in it is the MTF value. Figure 6 lists the sagittal curve S1 and meridional curve T1 of the MTF varying with the field of view at a spatial frequency of 62.5 lp / mm, the sagittal curve S2 and meridional curve T2 of the MTF varying with the field of view at a spatial frequency of 125 lp / mm, and the sagittal curve S3 and meridional curve T3 of the MTF varying with the field of view at a spatial frequency of 250 lp / mm. It can be seen from Figure 6 that at a spatial frequency of 125 lp / mm, within the range of 0.8 field of view (image height of 1.12 millimeters), the MTF is greater than 0.52; at a spatial frequency of 250 lp / mm, within the range of 0.7 field of view (image height of 0.98 millimeters), the MTF is greater than 0.24, and the imaging quality of the three-dimensional sensing receiving optical system 100 is excellent.

[0149] Please refer to Figure 7 , Figure 7 which shows the field curvature graph of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2, Figure 7 where the horizontal axis in it is the field curvature, and its unit is millimeter; Figure 7 the vertical axis in it is the Y-axis field of view, and its unit is degree. Figure 7 in it, S1 is the field curvature of the near-infrared light with a wavelength of 920 nanometers in the sagittal direction, T1 is the field curvature of the near-infrared light with a wavelength of 920 nanometers in the meridional direction; S2 is the field curvature of the near-infrared light with a wavelength of 940 nanometers in the sagittal direction, T2 is the field curvature of the near-infrared light with a wavelength of 940 nanometers in the meridional direction; S3 is the field curvature of the near-infrared light with a wavelength of 960 nanometers in the sagittal direction, T3 is the field curvature of the near-infrared light with a wavelength of 960 nanometers in the meridional direction. It can be seen from Figure 7 that for the three-dimensional sensing receiving optical system 100 under the near-infrared light with a wavelength of 940 nanometers, the maximum field curvature in the sagittal direction is 0.038 millimeter, and the maximum field curvature in the meridional direction of the three-dimensional sensing receiving optical system 100 is 0.041 millimeter, meeting the requirements for field curvature in the excellent imaging quality standard.

[0150] Please refer to Figure 8 , Figure 8 which shows the distortion graph of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2 under the near-infrared light of 920 nanometers, 940 nanometers, and 960 nanometers. Since the distortion curves of the near-infrared light of 920 nanometers, 940 nanometers, and 960 nanometers almost completely overlap, therefore, the three curves are not distinguished in this embodiment. It can be seen from Figure 8It can be seen that the maximum distortion of the three-dimensional sensing receiving optical system 100 provided in Embodiment 2 is -0.64%, and the distortion is small, meeting the requirements for distortion in the excellent imaging quality standard.

[0151] Embodiment 3

[0152] Figure 9 Fig. shows a schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3. Figure 9 In the three-dimensional sensing receiving optical system 100, along the optical axis S from the object surface A to the image surface B, it successively includes: a diaphragm 40, a first aspherical lens 10, a metalens 210, a second aspherical lens 220, a third aspherical lens 30, and a protective glass 50. Among them, micro-nano structures 2120 are provided on both the object side surface and the image side surface of the substrate 2110. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3 are shown in Table 3-1.

[0153] Table 3-1. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3

[0154] Parameter Data Total Track Length (TTL) 2.204mm Maximum Field Angle (2ω) 78.1° F Number 2.00 Effective Focal Length 1.73mm Working Wavelength Band Near Infrared (920nm - 960nm)

[0155] As can be seen from Table 3-1, the working wavelength band of the three-dimensional sensing receiving optical system 100 is from 920 nm to 960 nm, and the total optical length of the three-dimensional sensing receiving optical system 100 is relatively short, only 2.204 mm. Therefore, the volume of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3 is relatively small. The maximum field of view angle of the three-dimensional sensing receiving optical system 100 is 78.1°, and the field of view is large. The F number of the three-dimensional sensing receiving optical system 100 is 1.73, which can greatly increase the light input amount of the three-dimensional sensing receiving optical system 100, and can collect as much energy entering the three-dimensional sensing receiving optical system 100 as possible when the image sensor has a low response to light energy, thereby ensuring excellent imaging quality.

[0156] Along the direction of the optical axis S from the object surface A to the image surface B, starting from the diaphragm 40, each surface in the three-dimensional sensing receiving optical system 100 is numbered, and after summarizing the parameters of each surface, the following Table 3-2 is obtained.

[0157] Table 3-2. Parameters of each surface in the three-dimensional sensing receiving optical system 100 provided in Embodiment 3

[0158] Surface Serial Number Surface Type Radius of Curvature (mm) Thickness (mm) Refractive Index and Abbe Number 1 Diaphragm Infinity -0.107 - 2 Even Asphere 0.866 0.278 1.65,21.5 3 Even Asphere 2.778 0.096 - 4 Structural Surface Infinity 0.272 1.46,67.8 5 Structural Surface Infinity 0.280 - 6 Even Asphere -0.840 0.279 1.66,20.4 7 Even Asphere -0.979 0.032 - 8 Even Asphere 0.798 0.317 1.64,24.0 9 Even Asphere 0.631 0.340 - 10 Sphere Infinity 0.210 1.52,54.5 11 Sphere Infinity 0.100 - 12 Image Plane Infinity - -

[0159] For the analysis of each surface in Table 3-2, reference can be made to Embodiment 1, and this embodiment will not be analyzed again.

[0160] Surfaces 2, 3, 6, 7, 8, and 9 are all even aspherical surfaces, and their surface profiles satisfy the following relationship:

[0161]

[0162] Among them, Z(r) is the distance sagitta from the vertex of the aspheric surface at the position with height r along the optical axis S direction of the aspheric surface; c is the surface curvature of the aspheric surface, c = 1 / R, and R is the radius of curvature of the aspheric surface; k is the conic coefficient; A, B, C, D... are the aspheric coefficients. The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be obtained by querying Table 3-3.

[0163] Table 3-3. Coefficients of Each Order of Even Aspheric Surfaces in the Three-Dimensional Sensing and Receiving Optical System 100 Provided in Embodiment 3

[0164]

[0165] The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be obtained by querying Table 3-3, and will not be elaborated one by one in this embodiment.

[0166] Please refer to Figure 10 , Figure 10 which shows the MTF field curve diagram of the three-dimensional sensing and receiving optical system 100 provided in Embodiment 3. Figure 10 The horizontal axis in Figure 10 is the image height, and its unit is millimeter, that is, Figure 10 the horizontal axis in Figure 10 measures the field of view with the image height; Figure 10 The vertical axis in

[0167] Please refer to Figure 11 , Figure 11 which shows the field curvature diagram of the three-dimensional sensing and receiving optical system 100 provided in Embodiment 3. Figure 11 The horizontal axis in Figure 11 is the field curvature, and its unit is millimeter; Figure 11The field curvatures of near-infrared light with wavelengths of 920 nm, 940 nm, and 960 nm in the sagittal and meridional directions are respectively shown. Since the field curvature curves of near-infrared light with wavelengths of 920 nm, 940 nm, and 960 nm in the sagittal direction almost completely overlap, in this embodiment, they are uniformly labeled as S; since the field curvature curves of near-infrared light with wavelengths of 920 nm, 940 nm, and 960 nm in the meridional direction almost completely overlap, in this embodiment, they are uniformly labeled as S. From Figure 11 it can be seen that for the three-dimensional sensing receiving optical system 100 under near-infrared light with a wavelength of 940 nm, the maximum field curvature in the sagittal direction is 0.073 mm, and the maximum field curvature of the three-dimensional sensing receiving optical system 100 in the meridional direction is 0.101 mm, meeting the requirements for field curvature in the excellent imaging quality standard.

[0168] Please refer to Figure 12 , Figure 12 which shows the distortion diagrams of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3 under near-infrared light with wavelengths of 920 nm, 940 nm, and 960 nm. Since the distortion curves of near-infrared light with wavelengths of 920 nm, 940 nm, and 960 nm almost completely overlap, in this embodiment, the three curves are not distinguished. From Figure 12 it can be seen that the maximum distortion of the three-dimensional sensing receiving optical system 100 provided in Embodiment 3 is -0.80%, with a relatively small distortion, meeting the requirements for distortion in the excellent imaging quality standard.

[0169] Embodiment 4

[0170] Figure 13 shows a schematic diagram of the architecture layout of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4, Figure 13 in which the three-dimensional sensing receiving optical system 100 along the optical axis S sequentially includes, from the object surface A to the image surface B: a diaphragm 40, a first aspherical lens 10, a metalens 210, a second aspherical lens 220, a third aspherical lens 30, and a protective glass 50. Among them, the micro-nano structure 2120 is located on the image side surface of the substrate 2110. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4 are shown in Table 4-1.

[0171] Table 4-1. Some parameters of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4

[0172] Parameter Data Total Track Length (TTL) 2.204mm Maximum Field Angle (2ω) 78.4° F Number 2.00 Effective Focal Length 1.73mm Working Wavelength Band Near Infrared (920nm - 960nm)

[0173] As can be seen from Table 4-1, the operating wavelength band of the three-dimensional sensing receiving optical system 100 is from 920 nanometers to 960 nanometers. The total optical length of the three-dimensional sensing receiving optical system 100 is relatively short, only 2.204 millimeters. Therefore, the volume of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4 is relatively small. The maximum field of view angle of the three-dimensional sensing receiving optical system 100 is 78.4°, and the field of view is relatively large. The F number of the three-dimensional sensing receiving optical system 100 is 2.00, which can greatly increase the amount of incident light of the three-dimensional sensing receiving optical system 100, and collect as much energy entering the three-dimensional sensing receiving optical system 100 as possible when the image sensor has a low response to light energy, thereby ensuring excellent imaging quality.

[0174] Along the optical axis S from the object surface A to the image surface B direction, starting from the aperture stop 40, each surface in the three-dimensional sensing receiving optical system 100 is numbered, and after summarizing the parameters of each surface, the following Table 4-2 is obtained.

[0175] Table 4-2. Parameters of each surface in the three-dimensional sensing receiving optical system 100 provided in Embodiment 4

[0176] Surface Serial Number Surface Type Radius of Curvature (mm) Thickness (mm) Refractive Index and Abbe Number 1 Diaphragm Infinity -0.133 - 2 Even Asphere 0.763 0.334 1.65,21.5 3 Even Asphere 2.057 0.240 - 4 Even Asphere -1.253 0.236 1.66,20.4 5 Even Asphere -1.635 0.100 - 6 Sphere Infinity 0.300 1.46,67.8 7 Structural Surface Infinity 0.110 - 8 Even Asphere 1.205 0.253 1.64,24.0 9 Even Asphere 0.955 0.321 - 10 Sphere Infinity 0.210 1.52,54.5 11 Sphere Infinity 0.100 - 12 Image Plane Infinity - -

[0177] For the analysis of each surface in Table 4-2, reference can be made to Embodiment 1, and this embodiment will not be analyzed again.

[0178] Surfaces 2, 3, 6, 7, 8, and 9 are all even aspherical surfaces, and their surface shapes satisfy the following relationship:

[0179]

[0180] Among them, Z(r) is the distance sag from the vertex of the aspherical surface along the optical axis S at the position with a height of r; c is the curvature of the aspherical surface, c = 1 / R, and R is the radius of curvature of the aspherical surface; k is the conic coefficient; A, B, C, D... are the aspherical coefficients. The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be queried from Table 4-3.

[0181] Table 4-3. Coefficients of each order of the even aspherical surfaces in the three-dimensional sensing receiving optical system 100 provided in Embodiment 4

[0182]

[0183] The values of k, A, B, C, D... of surfaces 2, 3, 6, 7, 8, and 9 can be queried from Table 4-3, and will not be elaborated one by one in this embodiment.

[0184] Please refer to Figure 14 ,Figure 14 Shows the MTF field curve graph of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4, Figure 14 in which the horizontal axis is the image height, and its unit is millimeter, that is, Figure 14 the horizontal axis in measures the field of view with the image height; Figure 14 the vertical axis in is the MTF value. Figure 14 lists the sagittal curve S1 and meridional curve T1 of the MTF varying with the field of view at a spatial frequency of 62.5 lp / mm, the sagittal curve S2 and meridional curve T2 of the MTF varying with the field of view at a spatial frequency of 125 lp / mm, and the sagittal curve S3 and meridional curve T3 of the MTF varying with the field of view at a spatial frequency of 250 lp / mm. From Figure 14 it can be seen that at a spatial frequency of 125 lp / mm, within the field of view of 0.8 (image height of 1.12 mm), the MTF is greater than 0.47; at a spatial frequency of 250 lp / mm, within the field of view of 0.7 (image height of 0.98 mm), the MTF is greater than 0.23, and the imaging quality of the three-dimensional sensing receiving optical system 100 is excellent.

[0185] Please refer to Figure 15 , Figure 15 shows the field curvature graph of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4, Figure 15 in which the horizontal axis is the field curvature, and its unit is millimeter; Figure 15 the vertical axis in is the Y-axis field of view, and its unit is degree. Figure 15 in, S1 is the field curvature of the near-infrared light with a wavelength of 920 nm in the sagittal direction, T1 is the field curvature of the near-infrared light with a wavelength of 920 nm in the meridional direction; S2 is the field curvature of the near-infrared light with a wavelength of 940 nm in the sagittal direction, T2 is the field curvature of the near-infrared light with a wavelength of 940 nm in the meridional direction; S3 is the field curvature of the near-infrared light with a wavelength of 960 nm in the sagittal direction, T3 is the field curvature of the near-infrared light with a wavelength of 960 nm in the meridional direction. From Figure 15 it can be seen that for the three-dimensional sensing receiving optical system 100 under the near-infrared light with a wavelength of 940 nm, the maximum field curvature in the sagittal direction is 0.026 mm, and the maximum field curvature in the meridional direction of the three-dimensional sensing receiving optical system 100 is 0.046 mm, meeting the requirements for field curvature in the excellent imaging quality standard.

[0186] Please refer to Figure 16 , Figure 16 shows the distortion graph of the three-dimensional sensing receiving optical system 100 under the near-infrared light of 920 nm, 940 nm, and 960 nm. Since the distortion curves of the near-infrared light of 920 nm, 940 nm, and 960 nm almost completely overlap, therefore, the three curves are not distinguished in this embodiment. From Figure 16It can be seen that the maximum distortion of the three-dimensional sensing receiving optical system 100 provided in Embodiment 4 is -1.56%, and the distortion is small, meeting the requirements for distortion in the excellent imaging quality standard.

[0187] After summarizing the parameters of the three-dimensional sensing receiving optical system 100 provided in the above 4 embodiments, Table 5 as shown below is obtained. The display of Table 5 is mainly used to illustrate that the various conditions met by the three-dimensional sensing receiving optical system 100 provided in the present application are all experimentally verified and supported.

[0188] Table 5. Parameters of the three-dimensional sensing receiving optical system 100 provided in each embodiment

[0189]

[0190]

[0191] The present application also provides a three-dimensional sensing receiving optical lens (not shown in the figure). The three-dimensional sensing receiving optical lens includes an imaging detector (not shown in the figure) and the above three-dimensional sensing receiving optical system 100. The specific architecture of the three-dimensional sensing receiving optical system 100 can be referred to above and will not be elaborated here. The imaging detector is disposed on the image plane B of the three-dimensional sensing receiving optical system 100. The imaging detector includes but is not limited to CMOS (Complementary Metal Oxide Semiconductor, abbreviated as CMOS, complementary metal oxide semiconductor) and CCD (Charge Coupled Device, abbreviated as CCD, charge coupled device).

[0192] The application fields of the three-dimensional sensing receiving optical lens provided by the present application include but are not limited to the TOF field.

[0193] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the appended claims.

Claims

1. A three-dimensional sensing receiving optical system, characterized in that: The three-dimensional sensing receiving optical system includes, from the object side to the image side along the optical axis, a first aspheric lens, a fold-super hybrid lens group and a third aspheric lens in sequence, the fold-super hybrid lens group includes a super lens and a second aspheric lens; the optical focal length of the first aspheric lens is positive, the object side surface of the first aspheric lens is convex to the object side, and the image side surface of the first aspheric lens is convex to the object side; the optical focal length of the super lens is positive, the super lens includes: a substrate and a micro-nano structure, the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the object side surface of the second aspheric lens is convex to the image side, and the image side surface of the second aspheric lens is convex to the image side; the optical focal length of the third aspheric lens is negative.

2. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The super lens and the second aspherical lens are sequentially arranged along the optical axis from the object side to the image side.

3. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The second aspheric lens and the super lens are sequentially arranged along the optical axis from the object side to the image side.

4. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Wherein, f is the effective focal length of the three-dimensional sensing receiving optical system, f1 is the focal length of the first aspheric lens, f2 is the focal length of the second aspheric lens, f3 is the focal length of the third aspheric lens, and f m is the focal length of the metalens.

5. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Wherein, V1 is the Abbe number of the material of the first aspheric lens, V2 is the Abbe number of the material of the second aspheric lens, V3 is the Abbe number of the material of the third aspheric lens, and V m is the Abbe number of the material of the superlens.

6. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Among them, the Sag 21 is the distance between the first point and the second point on the optical axis, the first point is the intersection of the object side surface of the second aspheric lens and the optical axis, and the second point is the point where the maximum effective diameter of the object side surface of the second aspheric lens is located; if the second point is located on the object side of the first point, then the Sag 21 is a negative value. If the second point is located on the image side of the first point, then the Sag 21 is a positive value; 21 is the radius of curvature of the object side surface of the second aspheric lens.

7. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Among them, the R 21 is the radius of curvature of the object side of the second aspheric lens, and the R 22 is the radius of curvature of the image-side surface of the second aspheric lens.

8. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Among them, the ∑CT is the sum of the center thickness of the first aspheric lens, the center thickness of the second aspheric lens, the center thickness of the third aspheric lens, and the center thickness of the super lens, and the ∑AT is the sum of the thickness of the air space between any two adjacent lenses on the optical axis.

9. The three-dimensional sensing receiving optical system according to claim 1, characterized in that: The three-dimensional sensing receiving optical system meets the following requirements: Among them, D1 is the effective diameter of the first lens along the direction from the object side to the image side of the optical axis, D2 is the effective diameter of the second lens along the direction from the object side to the image side of the optical axis, D3 is the effective diameter of the third lens along the direction from the object side to the image side of the optical axis, D4 is the effective diameter of the fourth lens along the direction from the object side to the image side of the optical axis, ImgH is the imaging area radius of the three-dimensional sensing receiving optical system on the image plane corresponding to the maximum half field of view angle, TTL is the total optical length, and FNO is the aperture number of the three-dimensional sensing receiving optical system.

10. The three-dimensional sensing receiving optical system according to any one of claims 1 to 9, characterized in that: The three-dimensional sensing receiving optical system further includes an aperture, and the aperture is arranged on the object side of the first aspheric lens; or, the aperture is arranged between any two adjacent lenses.

11. A three-dimensional sensing receiving optical lens, characterized in that: The three-dimensional sensing receiving optical lens comprises: an imaging detector and a three-dimensional sensing receiving optical system as described in any one of claims 1 to 10; the imaging detector is arranged on the image plane of the three-dimensional sensing receiving optical system.

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