Optical system, optical lens and electronic equipment

Abstract

The utility model discloses an optical system, an optical lens and electronic equipment, the optical system comprises a super lens and a refraction lens group, the refraction lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side, the surface, close to the object side, of the first lens protrudes towards the object side, and the surface, close to the image side, of the second lens protrudes towards the image side. The surface, close to the image side, of the first lens protrudes towards the object side, the first lens and the seventh lens are positive lenses, and the fifth lens and the eighth lens are negative lenses; the super lens is a positive lens and is arranged between any two adjacent lenses, or the super lens is arranged on the side, close to the object side, of the first lens, or the super lens is arranged on the side, close to the image side, of the eighth lens. The size of the optical system provided by the utility model is relatively small, the distortion of the optical system provided by the utility model is relatively small, and the imaging quality is excellent, so that the optical system can give consideration to both the high imaging quality and the small size.

Description

Technical Field

[0001] The present application relates to the field of lenses, and in particular to an optical system, an optical lens and an electronic device. Background Art

[0002] In the prior art, in order to improve the imaging quality of the optical system, the number of lenses of the optical system is usually increased, but increasing the number of lenses will increase the volume of the optical system, which is not conducive to the miniaturization of the optical system. That is, the optical system in the prior art usually cannot take into account both high imaging quality and small volume. Utility Model Content

[0003] In response to the above technical problems, the embodiments of the present application provide an optical system, an optical lens and an electronic device, which aim to solve the problem that the optical system in the prior art usually cannot achieve both high imaging quality and small size.

[0004] According to one aspect of an embodiment of the present application, an optical system is disclosed, the optical system comprising a super lens and a refractive lens group, the refractive lens group comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the surface of the first lens close to the object side is convex toward the object side, the surface of the first lens close to the image side is convex toward the object side, the first lens and the seventh lens are both positive lenses, and the fifth lens and the eighth lens are both negative lenses; the super lens is a positive lens, the super lens is arranged between any two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens; or, the super lens is arranged on the side of the first lens close to the object side; or, the super lens is arranged on the side of the eighth lens close to the image side.

[0005] In some embodiments, the superlens is disposed between the second lens and the third lens.

[0006] In some embodiments, the optical system satisfies: Among them, the TTL is the total optical length of the optical system, the ImgH is the imaging area radius of the optical system on the image plane corresponding to the maximum half field of view angle, the BFL is the optical back focal length of the optical system, and f is the effective focal length of the optical system.

[0007] In some embodiments, the optical system satisfies: Wherein, the TTL is the total optical length of the optical system, and the f m is the focal length of the metalens, and F# is the aperture number of the optical system.

[0008] In some embodiments, the optical system satisfies: Wherein, R1 is the curvature radius of the surface of the first lens close to the object side, R2 is the curvature radius of the surface of the first lens close to the image side, f1 is the focal length of the first lens, and f is the effective focal length of the optical system.

[0009] In some embodiments, the optical system satisfies: Among them, the f m is the focal length of the metalens, ImgH is the imaging area radius of the optical system on the image plane corresponding to the maximum half field of view angle, and f is the effective focal length of the optical system.

[0010] In some embodiments, the optical system satisfies: 0.115D≤ΔΦ m ≤3.12D, where the ΔΦ m is the difference between the maximum optical power of the metalens and the minimum optical power of the metalens.

[0011] In some embodiments, the optical system satisfies: Among them, the f m is the focal length of the superlens, and r m is the effective area radius of the metalens, is the maximum phase value provided by the metalens, and f is the effective focal length of the optical system.

[0012] In some embodiments, the optical system satisfies: Among them, the Φ m is the optical power of the metalens, the T m is the thickness of the super lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens having the largest ratio of optical power to thickness is the target lens, and the Φ a is the focal length of the target lens, the T a is the thickness of the target lens.

[0013] In some embodiments, the optical system satisfies: Wherein, f is the effective focal length of the optical system, and D is the entrance pupil diameter of the optical system.

[0014] In some embodiments, the optical system further comprises an aperture, and the aperture is disposed between any two adjacent lenses;

[0015] or,

[0016] Along the direction from the object side to the image side, the aperture stop is arranged on a side of the first lens close to the object side;

[0017] or,

[0018] Along the direction from the object side to the image side, the aperture stop is arranged on a side of the last lens close to the image side.

[0019] In some embodiments, along the direction from the object side to the image side, the aperture stop is disposed on a side of the first lens close to the object side.

[0020] A second aspect of an embodiment of the present application provides an optical lens, the optical lens comprising: an image sensor and an optical system as described in any one of the above items, wherein the image sensor is arranged on an image plane of the optical system.

[0021] A third aspect of an embodiment of the present application provides an electronic device, the electronic device comprising the optical lens as described above.

[0022] The optical system provided by the present application includes a super lens and a refractive lens group, and the refractive lens group includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence, the surface of the first lens close to the object side is convex to the object side, the surface of the first lens close to the image side is convex to the object side, the first lens and the seventh lens are both positive lenses, and the fifth lens and the eighth lens are both negative lenses; the super lens is a positive lens, and the super lens is arranged between any two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, or the super lens is arranged on the side of the first lens close to the object side, or the super lens is arranged on the side of the eighth lens close to the image side. The volume of the optical system provided by the present application is relatively small, and the distortion of the optical system provided by the present application is relatively small, and the imaging quality is excellent, so that the optical system can take into account both high imaging quality and small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0024] Figure 1 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0025] Figure 2 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0026] Figure 3 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0027] Figure 4A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0028] Figure 5 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0029] Figure 6 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0030] Figure 7 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0031] Figure 8 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0032] Fig. 9 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0033] Fig.10 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0034] Fig.11 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0035] Fig.12 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0036] Fig.13 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0037] Fig.14 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0038] Fig.15 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0039] Fig.16 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0040] Fig.17 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0041] Fig.18 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0042] Fig.19 A schematic diagram of the architecture layout of an optical system in an embodiment of the present application is shown.

[0043] Fig. 20 A field curvature diagram of an optical system in an embodiment of the present application is shown.

[0044] Fig.21 A distortion diagram of an optical system in an embodiment of the present application is shown.

[0045] Reference numerals

[0046] 100. Optical system;

[0047] 11. Super lens; 111. Substrate; 112. Micro-nano structure;

[0048] 21. First lens; 22. Second lens; 23. Third lens; 24. Fourth lens; 25. Fifth lens; 26. Sixth lens; 27. Seventh lens; 28. Eighth lens;

[0049] 3. Aperture;

[0050] 4. Optical protection parts;

[0051] A, object plane; B, image plane; S, optical axis; DETAILED DESCRIPTION

[0052] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0053] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present application. However, those skilled in the art will appreciate that the technical solution of the present application may be practiced while omitting one or more of the specific details, or other modules, components, etc. may be adopted. In other cases, known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring the present application and making the various aspects of the present application unclear.

[0054] See also Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of the structure layout of an optical system 100 in an embodiment of the present application, wherein the optical axis S is the center line of the light beam. Figure 1In the figure, the object to be measured is located on the left side of the leftmost lens, that is, the object side is located on the left side of the leftmost lens, and the object plane A is located on the object side. The image formed by the optical system 100 is located on the right side of the rightmost lens, that is, the image side is located on the right side of the rightmost lens, and the image plane B is located on the image side. Therefore, the direction from the object plane A to the image plane B along the optical axis S is consistent with the direction from the object side to the image side along the optical axis S.

[0055] The optical system 100 includes a metalens 11 and a refractive lens group. The refractive lens group includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27 and an eighth lens 28. The first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are arranged in sequence from the object side to the image side. The surface of the first lens 21 close to the object side is convex to the object side, and the surface of the first lens 21 close to the image side is convex to the object side. The first lens 21 and the seventh lens 27 are both positive lenses, and the fifth lens 25 and the eighth lens 28 are both negative lenses.

[0056] The superlens 11 is a positive lens, and the superlens 11 is disposed between any two adjacent lenses of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28, or the superlens 11 is disposed on the side of the first lens 21 close to the object side, or the superlens 11 is disposed on the side of the eighth lens 28 close to the image side, that is, the position of the superlens 11 can be any of the following:

[0057] (1) The super lens 11 is located on the object side of the first lens 21 .

[0058] (2) The super lens 11 is located between the first lens 21 and the second lens 22 .

[0059] (3) The super lens 11 is located between the second lens 22 and the third lens 23 .

[0060] (4) The super lens 11 is located between the third lens 23 and the fourth lens 24 .

[0061] (5) The super lens 11 is located between the fourth lens 24 and the fifth lens 25 .

[0062] (6) The super lens 11 is located between the fifth lens 25 and the sixth lens 26 .

[0063] (7) The super lens 11 is located between the sixth lens 26 and the seventh lens 27 .

[0064] (8) The super lens 11 is located between the seventh lens 27 and the eighth lens 28 .

[0065] (9) The super lens 11 is located on the image side of the eighth lens 28 .

[0066] The super-lens 11 includes a substrate 111 and a super-structure unit located on the surface of the substrate 111, and a micro-nano structure 112 is provided at the vertex and / or center of the super-structure unit. The filling material between the micro-nano structures 112 is air or other materials that are transparent in the visible light band, and the micro-nano structure 112 is provided on the surface of the substrate 111 close to the object side and / or the surface of the substrate 111 close to the image side. The micro-nano structure 112 on the surface of the substrate 111 close to the object side can be provided with one layer, two layers or more than three layers. Similarly, the micro-nano structure 112 on the surface of the substrate 111 close to the image side can be provided with one layer, two layers or more than three layers. According to the phase modulation method adopted, the corresponding phase modulation formula can be adaptively used to configure the various parameters of the micro-nano structure 112, so that the super-lens 11 can achieve the corresponding optical performance.

[0067] The optical system 100 provided in the present application has a relatively small volume, and has relatively small distortion and excellent imaging quality, so that the optical system 100 can simultaneously take into account high imaging quality and small volume.

[0068] In some embodiments, the micro-nano structure 112 is disposed on the surface of the substrate 111 close to the object side. Since light is incident on the superlens 11 firstly incident on the micro-nano structure 112 and then incident on the substrate 111, when the micro-nano structure 112 is disposed on the surface of the substrate 111 close to the object side, it is beneficial to control the aberration of the superlens 11.

[0069] In some embodiments, the micro-nano structure 112 is disposed on the surface of the substrate 111 close to the image side. When light is incident on the metalens 11, it is first incident on the substrate 111 and then incident on the micro-nano structure 112. Therefore, the substrate 111 can refract the light, thereby reducing the incident angle of the light incident on the micro-nano structure 112, so that the metalens 11 can exert better optical performance in the optical system 100.

[0070] In some embodiments, the micro-nano structure 112 is disposed on the surface of the substrate 111 close to the object side, and the micro-nano structure 112 is also disposed on the surface of the substrate 111 close to the image side. Since the micro-nano structures 112 on both sides of the substrate 111 can deflect the incident light, therefore, when the micro-nano structure 112 is disposed on the surface of the substrate 111 close to the object side, and the micro-nano structure 112 is also disposed on the surface of the substrate 111 close to the image side, the superlens 11 has a strong deflection ability for the incident light, and at the same time, the aberration and chromatic aberration can be controlled by configuring the micro-nano structures 112 on both sides of the substrate 111.

[0071] In some embodiments, the micro-nano structure 112 has a layer, and the layer of micro-nano structure 112 can be disposed on a surface of the substrate 111 close to the object side, or on a surface of the substrate 111 close to the image side.

[0072] In some embodiments, the micro-nano structure 112 has two or more layers, so that the superlens 11 can provide a higher degree of freedom in phase design. Preferably, the number of layers of the micro-nano structure 112 is two or three layers, so that the superlens 11 can provide sufficient degree of freedom in phase design while also taking into account better processability.

[0073] It is worth mentioning that the position of the micro-nano structure 112 on the substrate 111 and the number of layers of the micro-nano structure 112 are two different parameters. Therefore, the position of the micro-nano structure 112 and the number of layers of the micro-nano structure 112 can be combined with each other, so that the metalens 11 can obtain better optical performance. Exemplarily, the micro-nano structure 112 is arranged on the surface of the substrate 111 close to the object side, and the micro-nano structure 112 is provided with two layers. Exemplarily, the micro-nano structure 112 is arranged on the surface of the substrate 111 close to the image side, and the micro-nano structure 112 is provided with three layers. Exemplarily, the micro-nano structure 112 is arranged on the surface of the substrate 111 close to the object side, and the micro-nano structure 112 is also arranged on the surface of the substrate 111 close to the image side, and the micro-nano structure 112 on each side of the substrate 111 has two layers. It should be noted that the above combination is only used to provide an exemplary combination result, and it should not be understood that the position of the micro-nano structure 112 on the substrate 111 and the number of layers of the micro-nano structure 112 can only combine the above results.

[0074] It should be understood that when the surface of the substrate 111 close to the object side and the surface close to the image side are both provided with the micro-nano structure 112, the number of layers of the micro-nano structure 112 on the surface of the substrate 111 close to the object side and the number of layers of the micro-nano structure 112 on the surface of the substrate 111 close to the image side may be equal or unequal, as long as the superlens 11 has the expected optical performance.

[0075] In some embodiments, the super lens 11 is disposed between the second lens 22 and the third lens 23 .

[0076] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies conditional equation 1: Wherein, TTL (Total Track Length, referred to as TTL, optical total length) is the total optical length of the optical system 100. TTL refers to the distance from the center of the front surface of the first lens in the optical system 100 to the imaging plane. In this embodiment, TTL is the distance from the surface of the first lens 21 close to the object side to the image plane B on the optical axis S. The dimension of TTL is a length unit, such as millimeters. ImgH is the radius of the imaging area of ​​the optical system 100 corresponding to the maximum half field angle on the image plane. The dimension of ImgH is a length unit, such as millimeters. BFL (Back focal length, referred to as BFL) is the optical back focal length of the optical system 100. BFL is the distance from the last optical surface vertex of the optical system 100 to the image plane. In this embodiment, BFL is the distance from the surface of the eighth lens 28 close to the image side to the image plane B on the optical axis S. The dimension of BFL is a length unit, such as millimeters. f is the effective focal length of the optical system 100. The dimension of f is a length unit, such as millimeters. TTL, ImgH, BFL, and f have the same dimension, which is a length unit, for example, millimeters. The optical system 100 satisfies the conditional expression 1, so that the optical system 100 has a better imaging quality.

[0077] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies conditional equation 2: Wherein, TTL is the total optical length of the optical system 100, and the unit of TTL is millimeter. m is the focal length of the superlens 11, f m The unit is millimeter. F# is the aperture number of the optical system 100.

[0078] Conditional expression 2 represents the contribution of the metalens 11 to the compressed volume in the optical system 100. The lower limit of conditional expression 2 represents the maximum volume compression capability that the metalens 11 can provide under a unit aperture number, and the upper limit of conditional expression 2 represents the minimum volume compression capability that the metalens 11 can provide under a unit aperture number.

[0079] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies conditional equation 3: Wherein, R1 is the radius of curvature of the surface of the first lens 21 close to the object side, and the dimension of R1 is a length unit, such as millimeters. R2 is the radius of curvature of the surface of the first lens 21 close to the image side, and the dimension of R2 is a length unit, such as millimeters. f1 is the focal length of the first lens 21, and the dimension of f1 is a length unit, such as millimeters. f is the effective focal length of the optical system 100, and the dimension of f is a length unit, such as millimeters.

[0080] The lower limit of Conditional Formula 3 can ensure that the first lens 21 can converge the light in the optical system 100 , and the upper limit of Conditional Formula 3 can ensure that other lenses except the first lens 21 can contribute a certain proportion of optical power.

[0081] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies Conditional Formula 4: Among them, f m is the focal length of the superlens 11, f m The unit of is millimeter. ImgH is the imaging area radius corresponding to the maximum half field angle on the image plane of the optical system 100, and the unit of ImgH is millimeter. f is the effective focal length of the optical system 100, and the unit of f is millimeter.

[0082] The lower limit of conditional formula 4 is used to limit the focal length of the metalens 11. The lower limit of conditional formula 4 can prevent the metalens 11 from being unable to be manufactured due to excessive focal length. Specifically, when the focal length of the metalens 11 is large, the aspect ratio of the micro-nano structure 112 of the metalens 11 is usually large, but the micro-nano structure 112 with a large aspect ratio is less compatible with the existing semiconductor processing technology, which may make the metalens 11 with excessive focal length difficult to manufacture. The upper limit of conditional formula 4 is to ensure that the metalens 11 has a chromatic aberration correction capability that meets the preset requirements in the optical system 100.

[0083] In some embodiments, when the super lens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies the conditional equation 5: 0.115D≤ΔΦ m ≤3.12D, where ΔΦ m is the difference between the maximum optical focal length of the super lens 11 and the minimum optical focal length of the super lens 11. The D (Diopter, abbreviated as D) in conditional expression 5 is the unit of optical focal length.

[0084] In the present application, since the optical focal length of the super lens 11 changes with the wavelength of the incident light, ΔΦ m is the difference between the maximum and minimum focal lengths of the superlens 11 in the working band, i.e., ΔΦ m is the focal power span of the superlens 11.

[0085] Conditional formula 5 is used to reflect the chromatic aberration correction capability of the metalens 11 in the optical system 100. The lower limit of conditional formula 5 represents the minimum chromatic aberration correction capability requirement that the entire optical system 100 needs to provide to the metalens 11, and the upper limit of conditional formula 5 represents the maximum chromatic aberration correction capability that the metalens 11 can provide in the optical system 100.

[0086] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies Conditional Formula 6: Among them, f m is the focal length of the superlens 11, f m The unit is millimeters. m is the effective area radius of the superlens 11, r m The unit is millimeters. is the maximum phase value provided by the superlens 11, The unit of is rad. f is the effective focal length of the optical system 100, and the unit of f is millimeter.

[0087] It is worth mentioning that The selection should follow the following principles:

[0088] (1) When the micro-nanostructure 112 is disposed on only one side of the substrate 111 close to the object side, the maximum phase of the superlens 11 is selected as

[0089] (2) When the micro-nanostructure 112 is disposed only on the side of the substrate 111 close to the image side, the maximum phase of the superlens 11 is selected as

[0090] (3) When the surface of the substrate 111 close to the object side and the surface of the substrate 111 close to the image side are both provided with the micro-nano structure 112, the surface of the substrate 111 close to the object side and the micro-nano structure 112 provided on the surface of the substrate 111 close to the object side constitute the front surface of the superlens 11, and the maximum phase of the front surface of the superlens 11 is The surface of the substrate 111 close to the image side and the micro-nano structure 112 arranged on the surface of the substrate 111 close to the image side constitute the rear surface of the super lens 11. The maximum phase of the rear surface of the super lens 11 is The maximum phase of the front surface of the superlens 11 and the maximum phase of the rear surface of the super lens 11 The larger of f is the effective focal length of the optical system 100 , and the unit of f is millimeter.

[0091] The upper limit of conditional formula six represents the maximum optical performance that the metalens 11 needs to contribute when the optical system 100 is to achieve the target optical performance and compress the volume. The lower limit of conditional formula six represents the minimum requirement for the optical performance that the metalens 11 needs to bear in the optical system 100 when the optical system 100 is to achieve the target optical performance and compress the volume.

[0092] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies Conditional Formula 7: Among them, Φm is the focal length of the superlens 11, Φ m The unit is D. T m is the thickness of the superlens 11, T m The unit is millimeters.

[0093] The lens having the largest ratio of optical power to thickness among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28 is the target lens. Specifically, the ratio of the optical power to thickness of the first lens 21, the ratio of the optical power to thickness of the second lens 22, the ratio of the optical power to thickness of the third lens 23, the ratio of the optical power to thickness of the fourth lens 24, the ratio of the optical power to thickness of the fifth lens 25, the ratio of the optical power to thickness of the sixth lens 26, the ratio of the optical power to thickness of the seventh lens 27, and the ratio of the optical power to thickness of the eighth lens 28 can be calculated in advance, and then the lens corresponding to the largest of the eight ratios is taken as the target lens, Φ a is the focal length of the target lens, Φ a The unit is D. T a is the thickness of the target lens, T a The unit is millimeters.

[0094] Conditional formula 7 is the difference between the ratio of the optical power to thickness of the metalens 11 in the optical system 100 and the ratio of the optical power to thickness of the conventional lenses (the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28). Conditional formula 7 reflects the comparison between the ratio of the optical power to thickness of the metalens 11 and the ratio of the optical power to thickness of the conventional lenses in the optical system 100. The lower limit of conditional formula 7 represents the case where the ratio of the optical power to thickness of the metalens 11 in the optical system 100 is the smallest and the ratio of the optical power to thickness of the conventional lenses is the largest, and the upper limit of conditional formula 7 represents the case where the ratio of the optical power to thickness of the metalens 11 in the optical system 100 is the largest and the ratio of the optical power to thickness of the conventional lenses is the smallest.

[0095] In some embodiments, when the metalens 11 is disposed between the second lens 22 and the third lens 23, the optical system 100 satisfies Conditional Formula 8: Wherein, f is the effective focal length of the optical system 100, and the dimension of f is a length unit, such as millimeter. D is the entrance pupil diameter of the optical system 100, and the dimension of D is a length unit, such as millimeter. Conditional formula eight reflects the F number range of the optical system 100.

[0096] In some embodiments, the optical system 100 further includes an aperture 3, and the aperture 3 can be disposed at any of the following positions:

[0097] (1) The aperture 3 is disposed between any two adjacent lenses. Here, the “two adjacent lenses” are any two adjacent lenses among the first lens 21 , the second lens 22 , the third lens 23 , the fourth lens 24 , the fifth lens 25 , the sixth lens 26 , the seventh lens 27 and the eighth lens 28 .

[0098] (2) Along the direction from the object side to the image side, the aperture 3 is arranged on the side of the first lens close to the object side.

[0099] (3) Along the direction from the object side to the image side, the aperture 3 is arranged on the side of the last lens close to the image side.

[0100] In a specific embodiment, along the direction from the object side to the image side, the aperture 3 is arranged on a side of the first lens close to the object side.

[0101] In some embodiments, at least one lens of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 is made of plastic to reduce the cost and processing difficulty of the lens. Specifically, the material of the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 can be any of the following:

[0102] (1) Any one of the first lens 21 , the second lens 22 , the third lens 23 , the fourth lens 24 , the fifth lens 25 , the sixth lens 26 , the seventh lens 27 and the eighth lens 28 is made of plastic.

[0103] (2) Any two lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0104] (3) Any three lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0105] (4) Any four lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0106] (5) Any five lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0107] (6) Any six lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0108] (7) Any seven lenses among the first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are made of plastic.

[0109] (8) The first lens 21, the second lens 22, the third lens 23, the fourth lens 24, the fifth lens 25, the sixth lens 26, the seventh lens 27 and the eighth lens 28 are all made of plastic.

[0110] In some embodiments, at least one lens of the first lens 21 , the second lens 22 , the third lens 23 , the fourth lens 24 , the fifth lens 25 , the sixth lens 26 , the seventh lens 27 and the eighth lens 28 is made of silicon dioxide.

[0111] In some embodiments, the phase distribution of the metalens 11 satisfies the following formula:

[0112]

[0113]

[0114]

[0115]

[0116]

[0117]

[0118]

[0119]

[0120] Wherein, r is the distance from the center of the superlens 112 to any nanostructure; λ is the operating wavelength of the superlens 112; is any phase related to the working wavelength of the superlens 112; (x, y) is the mirror coordinate of the superlens 11; f m is the focal length of the super lens 11; a i and b i are real coefficients.

[0121] See also Figure 1In some embodiments, the optical system 100 further includes an optical protection member 4, which can transmit light and is located on the side of the last lens facing the image side from the object side to the image side along the optical axis S. The specific form of the optical protection member 4 can be protective glass.

[0122] The present application illustratively provides seven optical systems 100 that meet usage requirements in seven embodiments. Next, the optical system 100 provided by each embodiment of the present application is described in detail.

[0123] Example 1

[0124] Figure 1 The schematic diagram of the architecture layout of the optical system 100 in Example 1 is shown. In Example 1, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 1, the micro-nano structure 112 is located on the side of the substrate 111 close to the object side. Some parameters of the optical system 100 in Example 1 are shown in Table 1.

[0125] Table 1. Partial parameters of the optical system 100 in Example 1

[0126] parameter data Total optical length (TTL) 10.23mm Maximum field of view (FOV) 86.6° F-number 1.62 Effective focal length 8.51mm Working band Visible light

[0127] As can be seen from Table 1, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.23 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 86.6°. The F number (aperture) of the optical system 100 in this embodiment is 1.62, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.51 mm.

[0128] The optical system 100 in this embodiment has a central field MTF (Modulation Transfer Function, MTF for short) greater than 0.8 at 100 lp / mm, a 0.5 field MTF greater than 0.65, a 0.7 field MTF greater than 0.6, and a 0.8 field MTF greater than 0.6. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field angle of the optical system 100 in this embodiment is 86.6°, which can meet the field angle requirements of wide-angle lenses.

[0129] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 2.

[0130] Table 2. Parameters of various surfaces in the optical system 100 provided in Example 1

[0131]

[0132]

[0133] For each surface in Table 2, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. The surface of the super lens 11 close to the object side is surface 6, and the micro-nano structure 112 is located on surface 6. Surface 7 is the surface of the super lens 11 close to the image side. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0134] Please refer to Table 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 -1.2E+00 mm, and the material between surface 1 and surface 2 is air. Surface 2 is an aspherical surface, the radius of curvature of surface 2 is 3.5E+00 mm, the distance between surface 2 and surface 3 is 1.4E+00 mm, and the refractive index and Abbe number of the material between surface 2 and surface 3 are 1.53 and 56.1, respectively. The focal length of the first lens 21 composed of surface 2 and surface 3 is 9.6 mm. Surface 3 is an aspherical surface, the radius of curvature of surface 3 is 9.1E+00 mm, and the distance between surface 3 and surface 4 is 7.3E-02 mm. Surface 4 is an aspherical surface, the radius of curvature of surface 4 is 9.4E+00 mm, the distance between surface 4 and surface 5 is 3.0E-01 mm, and the refractive index and Abbe number of the material between surface 4 and surface 5 are 1.64 and 21.5, respectively. The focal length of the second lens 22 composed of surface 4 and surface 5 is -57.8 mm. Surface 5 is an aspherical surface, the radius of curvature of surface 5 is 7.5E+00 mm, and the distance between surface 5 and surface 6 is 5.2E-01 mm. Surface 6 is a spherical surface, the radius of curvature of surface 6 is infinite, that is, surface 6 is a plane, the distance between surface 6 and surface 7 is 3.0E-01 mm, and the refractive index and Abbe number of the material between surface 6 and surface 7 are 1.45 and 67.8 respectively. The focal length of the superlens 11 composed of surface 6 and surface 7 is 280.8 mm. Surface 7 is a spherical surface, the radius of curvature of surface 7 is infinite, that is, surface 7 is a plane, and the distance between surface 7 and surface 8 is 3.0E-02 mm. Surface 8 is an aspherical surface, the radius of curvature of surface 8 is 1.9E+01 mm, the distance between surface 8 and surface 9 is 3.2E-01 mm, and the refractive index and Abbe number of the material between surface 8 and surface 9 are 1.54 and 56.1 respectively. The focal length of the third lens 23 composed of surface 8 and surface 9 is 177.0 mm. Surface 9 is an aspherical surface, the radius of curvature of surface 9 is 2.3E+01 mm, and the distance between surface 9 and surface 10 is 3.7E-01 mm. Surface 10 is an aspherical surface, the radius of curvature of surface 10 is 2.4E+01 mm, the distance between surface 10 and surface 11 is 4.5E-01 mm, and the refractive index and Abbe number of the material between surface 10 and surface 11 are 1.66 and 19.3 respectively. The focal length of the fourth lens 24 composed of surface 10 and surface 11 is -470.7 mm. Surface 11 is an aspheric surface, the radius of curvature of surface 11 is 2.2E+01 mm, and the distance between surface 11 and surface 12 is 4.1E-01 mm. Surface 12 is an aspheric surface, the radius of curvature of surface 12 is 2.8E+01 mm, the distance between surface 12 and surface 13 is 4.1E-01 mm, and the refractive index and Abbe number of the material between surface 12 and surface 13 are 1.65 and 20.4 respectively. The focal length of the fifth lens 25 composed of surface 12 and surface 13 is -248.8 mm.Surface 13 is an aspheric surface, the radius of curvature of surface 13 is 2.4E+01 mm, and the distance between surface 13 and surface 14 is 6.8E-01 mm. Surface 14 is an aspheric surface, the radius of curvature of surface 14 is -8.8E+00 mm, and the distance between surface 14 and surface 15 is 6.9E-01 mm. The refractive index and Abbe number of the material between surface 14 and surface 15 are 1.54 and 56.1 respectively. The focal length of the sixth lens 26 composed of surface 14 and surface 15 is 23.0 mm. Surface 15 is an aspheric surface, the radius of curvature of surface 15 is -5.3E+00 mm, and the distance between surface 15 and surface 16 is 1.4E-01 mm. Surface 16 is an aspheric surface, the radius of curvature of surface 16 is 3.2E+00 mm, the distance between surface 16 and surface 17 is 6.1E-01 mm, and the refractive index and Abbe number of the material between surface 16 and surface 17 are 1.51 and 56.3, respectively. The focal length of the seventh lens 27 composed of surface 16 and surface 17 is 26.9 mm. Surface 17 is an aspheric surface, the radius of curvature of surface 17 is 3.9E+00 mm, and the distance between surface 17 and surface 18 is 2.0E+00 mm. Surface 18 is an aspheric surface, the radius of curvature of surface 18 is -4.1E+00 mm, the distance between surface 18 and surface 19 is 8.2E-01 mm, and the refractive index and Abbe number of the material between surface 18 and surface 19 are 1.53 and 55.8, respectively. The focal length of the eighth lens 28 composed of surface 18 and surface 19 is -7.1 mm. Surface 19 is an aspherical surface, the radius of curvature of surface 19 is 4.6E+01 mm, and the distance between surface 19 and surface 20 is 4.3E-01 mm. Surface 20 is a spherical surface, the radius of curvature of surface 20 is infinite, that is, surface 20 is a plane, the distance between surface 20 and surface 21 is 2.1E-01 mm, and the refractive index and Abbe number of the material between surface 20 and surface 21 are 1.51 and 64.1 respectively. Surface 21 is a spherical surface, the radius of curvature of surface 21 is infinite, that is, surface 21 is a plane, and the distance between surface 21 and surface 22 is 1.0E-01 mm.

[0135] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0136]

[0137] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D... of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 3.

[0138] Table 3. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 1

[0139]

[0140] Now, the method of using Table 3 is explained by taking surface 2 as an example. For surface 2, its K is 3.1E-01, the 4th-order coefficient A is -8.7E-04, the 6th-order coefficient B is -1.8E-05, the 8th-order coefficient C is 4.9E-05, the 10th-order coefficient D is -2.7E-05, the 12th-order coefficient E is 4.1E-06, the 14th-order coefficient F is -1.7E-07, the 16th-order coefficient G is -1.7E-08, the 18th-order coefficient H is 7.9E-11, and the 20th-order coefficient I is 9.3E-12. The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 3.

[0141] See also Figure 2 , Figure 2 1 shows a field curvature diagram of the optical system 100 in Example 1 under light with a wavelength of 555 nanometers, Figure 2 The T curve in is the meridional field curvature. Figure 2 The S curve in the figure is the sagittal field curvature. Figure 2 The horizontal axis is the field curvature, and its unit is millimeter. Figure 2 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Figure 2 It can be seen that the field curvature of the optical system 100 in Example 1 in the meridional direction is 0.1068 mm, and the field curvature of the optical system 100 in Example 1 in the sagittal direction is 0.0427 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0142] See also Figure 3 , Figure 3 The distortion diagram of the optical system 100 in Example 1 under light with a wavelength of 555 nanometers is shown. Figure 3It can be seen that the maximum distortion of the optical system 100 in Example 1 is 2.2199%, which meets the distortion requirement of the excellent imaging quality standard.

[0143] Example 2

[0144] Figure 4 The schematic diagram of the architecture layout of the optical system 100 in Example 2 is shown. In Example 2, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 2, the micro-nano structure 112 is located on the side of the substrate 111 close to the object side. Some parameters of the optical system 100 in Example 2 are shown in Table 4.

[0145] Table 4. Partial parameters of the optical system 100 in Example 2

[0146] parameter data Total optical length (TTL) 10.10mm Maximum field of view (FOV) 86.8° F-number 1.58 Effective focal length 8.65mm Working band Visible light

[0147] As can be seen from Table 4, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.10 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 86.8°. The F number (aperture) of the optical system 100 in this embodiment is 1.58, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.65 mm.

[0148] The optical system 100 in this embodiment has an MTF greater than 0.8 at the center field of view at 100 lp / mm, an MTF greater than 0.65 at the 0.5 field of view, an MTF greater than 0.6 at the 0.7 field of view, and an MTF greater than 0.6 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 86.8°, which can meet the field of view angle requirements of wide-angle lenses.

[0149] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 5.

[0150] Table 5. Parameters of various surfaces in the optical system 100 provided in Example 2

[0151]

[0152]

[0153] For each surface in Table 5, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. The surface of the super lens 11 close to the object side is surface 6, and the micro-nano structure 112 is located on surface 6. Surface 7 is the surface of the super lens 11 close to the image side. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0154] For the analysis of Table 5, reference may be made to Example 1, and Table 5 will not be analyzed here.

[0155] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0156]

[0157] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D... of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 6.

[0158] Table 6. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 2

[0159]

[0160]

[0161] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 6. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0162] See also Figure 5 , Figure 5 1 shows a field curvature diagram of the optical system 100 in Example 2 under light with a wavelength of 555 nanometers, Figure 5 The T curve in is the meridional field curvature. Figure 5 The S curve in the figure is the sagittal field curvature. Figure 5 The horizontal axis is the field curvature, and its unit is millimeter. Figure 5 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Figure 5 It can be seen that the field curvature of the optical system 100 in Example 2 in the meridional direction is 0.4007 mm, and the field curvature of the optical system 100 in Example 2 in the sagittal direction is 0.1023 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0163] See also Figure 6 , Figure 6 The distortion diagram of the optical system 100 in Example 2 under light with a wavelength of 555 nanometers is shown. Figure 6 It can be seen that the maximum distortion of the optical system 100 in Example 2 is 1.4545%, which meets the distortion requirement of the excellent imaging quality standard.

[0164] Example 3

[0165] Figure 7 The schematic diagram of the architecture layout of the optical system 100 in Example 3 is shown. In Example 3, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 3, a micro-nano structure 112 is provided on the side of the substrate 111 close to the object side and the side of the substrate 111 close to the image side. Some parameters of the optical system 100 in Example 3 are shown in Table 7.

[0166] Table 7. Partial parameters of the optical system 100 in Example 3

[0167] parameter data Total optical length (TTL) 10.23mm Maximum field of view (FOV) 86.6° F-number 1.58 Effective focal length 8.51mm Working band Visible light

[0168] As can be seen from Table 7, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.23 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 86.6°. The F number (aperture) of the optical system 100 in this embodiment is 1.58, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.51 mm.

[0169] The optical system 100 in this embodiment has an MTF greater than 0.8 at the center field of view at 100 lp / mm, an MTF greater than 0.65 at the 0.5 field of view, an MTF greater than 0.6 at the 0.7 field of view, and an MTF greater than 0.6 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 86.6°, which can meet the field of view angle requirements of wide-angle lenses.

[0170] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 8.

[0171] Table 8. Parameters of various surfaces in the optical system 100 provided in Example 3

[0172]

[0173]

[0174] For each surface in Table 8, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. The surface of the super lens 11 close to the object side is surface 6, and the micro-nano structure 112 is located on surface 6. The surface of the super lens 11 close to the image side is surface 7, and surface 7 is also provided with a micro-nano structure 112. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0175] For the analysis of Table 8, reference may be made to Example 1, and Table 8 will not be analyzed here.

[0176] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0177]

[0178] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D... of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 9.

[0179] Table 9. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 3

[0180] Surface 2 Surface 3 Surface 4 Surface 5 Surface 8 Surface 9 Surface 10 Surface 11 K 3.0E-01 -8.4E+00 1.1E+01 2.9E+00 -2.2E+01 9.8E+01 9.8E+01 7.1E+01 4 times -8.6E-04 -1.7E-03 -6.4E-03 -2.3E-03 -1.1E-02 -1.2E-02 -1.1E-02 -1.1E-02 6 times -2.2E-05 -7.2E-05 3.5E-05 4.9E-04 1.0E-03 1.4E-04 -9.6E-04 5.7E-04 8 times 4.8E-05 9.2E-06 1.6E-04 -7.8E-05 1.4E-04 4.8E-05 -2.0E-04 -4.2E-04 10 times -2.7E-05 2.4E-05 -5.3E-06 3.8E-05 -3.9E-05 2.6E-05 -2.3E-05 1.5E-05 12 times 4.1E-06 -4.8E-07 2.3E-06 2.5E-07 -1.6E-07 -3.4E-06 1.5E-05 1.5E-05 14 times -1.7E-07 -6.2E-07 -8.2E-07 -1.4E-06 -7.5E-08 -1.5E-06 -2.6E-06 -3.4E-06 16 times -1.7E-08 5.2E-08 7.9E-08 2.0E-07 1.9E-07 3.0E-07 7.3E-08 2.4E-07 18 times 8.1E-11 4.1E-11 2.2E-11 -1.4E-09 -3.5E-09 -3.2E-09 1.1E-09 1.1E-10 20 times 8.3E-12 -3.0E-11 7.6E-11 -1.7E-10 -4.5E-10 -1.4E-10 2.3E-10 8.1E-11 Surface 12 Surface 13 Surface 14 Surface 15 Surface 16 Surface 17 Surface 18 Surface 19 K 2.7E+01 2.4E+01 -7.6E+01 -1.2E+01 -4.8E+00 -3.0E+00 -6.5E+00 2.0E+00 4 times -2.1E-02 -1.6E-02 1.2E-02 -5.6E-04 -4.8E-03 -6.2E-03 -1.1E-02 -3.7E-03 6 times 1.0E-03 -4.0E-04 -3.2E-03 6.7E-04 -3.1E-04 -1.3E-04 6.6E-04 -2.1E-05 8 times 3.1E-04 2.8E-04 1.6E-04 -2.9E-04 7.9E-08 1.6E-05 -8.9E-06 9.9E-06 10 times -3.3E-05 -1.4E-05 4.9E-06 2.2E-05 1.2E-06 -5.5E-07 -2.8E-07 -3.9E-07 12 times -7.5E-06 9.6E-07 -2.1E-07 7.8E-07 -6.8E-10 5.6E-09 1.1E-08 3.9E-09 14 times 1.8E-06 -2.5E-07 -7.0E-08 -1.4E-07 -1.9E-09 5.2E-10 -1.4E-10 6.0E-11 16 times -1.2E-07 1.1E-08 4.1E-09 4.0E-09 3.3E-11 -1.5E-11 6.6E-13 -9.7E-13 18 times 2.5E-11 1.2E-12 -1.6E-12 -1.7E-13 -3.2E-14 8.2E-15 -2.5E-16 1.2E-16 20 times 1.4E-11 1.4E-12 -2.0E-13 4.1E-15 0.0E+00 0.0E+00 0.0E+00 0.0E+00

[0181] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 9. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0182] See also Figure 8 , Figure 8 1 shows a field curvature diagram of the optical system 100 in Example 3 under light with a wavelength of 555 nanometers, Figure 8 The T curve in is the meridional field curvature. Figure 8 The S curve in the figure is the sagittal field curvature. Figure 8 The horizontal axis is the field curvature, and its unit is millimeter. Figure 8 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Figure 8 It can be seen that the field curvature of the optical system 100 in Example 3 in the meridional direction is 0.0825 mm, and the field curvature of the optical system 100 in Example 3 in the sagittal direction is 0.0409 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0183] See also Fig. 9 , Fig. 9 The distortion diagram of the optical system 100 in Example 3 under light with a wavelength of 555 nanometers is shown. Fig. 9 It can be seen that the maximum distortion of the optical system 100 in Example 3 is 2.3491%, which meets the distortion requirement of the excellent imaging quality standard.

[0184] Example 4

[0185] Fig.10 The schematic diagram of the architecture layout of the optical system 100 in Example 4 is shown. In Example 4, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 4, the micro-nano structure 112 is located on the side of the substrate 111 close to the image side. Some parameters of the optical system 100 in Example 4 are shown in Table 10.

[0186] Table 10. Partial parameters of the optical system 100 in Example 4

[0187] parameter data Total optical length (TTL) 10.40mm Maximum field of view (FOV) 87° F-number 1.60 Effective focal length 8.60mm Working band Visible light

[0188] As can be seen from Table 10, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.40 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 87°. The F number (aperture) of the optical system 100 in this embodiment is 1.6, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.6 mm.

[0189] The optical system 100 in this embodiment has an MTF greater than 0.8 at the center field of view at 100 lp / mm, an MTF greater than 0.6 at the 0.5 field of view, an MTF greater than 0.55 at the 0.7 field of view, and an MTF greater than 0.53 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 87°, which can meet the field of view angle requirements of wide-angle lenses.

[0190] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 11.

[0191] Table 11. Parameters of various surfaces in the optical system 100 provided in Example 4

[0192]

[0193]

[0194] For each surface in Table 11, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. Surface 6 is the surface of the super lens 11 close to the object side, and the surface of the super lens 11 close to the image side is surface 7, and the micro-nano structure 112 is located on surface 7. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0195] For the analysis of Table 11, reference may be made to Example 1, and Table 11 will not be analyzed here.

[0196] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0197]

[0198] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D, etc. of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 12.

[0199] Table 12. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 4

[0200]

[0201]

[0202] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 12. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0203] See also Fig.11 , Fig.11 1 shows a field curvature diagram of the optical system 100 in Example 4 under light with a wavelength of 555 nanometers, Fig.11 The T curve in is the meridional field curvature. Fig.11 The S curve in the figure is the sagittal field curvature. Fig.11 The horizontal axis is the field curvature, and its unit is millimeter. Fig.11 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Fig.11 It can be seen that the field curvature of the optical system 100 in Example 4 in the meridional direction is 0.2651 mm, and the field curvature of the optical system 100 in Example 4 in the sagittal direction is 0.0825 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0204] See also Fig.12 , Fig.12 The distortion diagram of the optical system 100 in Example 4 under light with a wavelength of 555 nanometers is shown. Fig.12 It can be seen that the maximum distortion of the optical system 100 in Example 4 is 2.2755%, which meets the distortion requirement of the excellent imaging quality standard.

[0205] Example 5

[0206] Fig.13 The schematic diagram of the architecture layout of the optical system 100 in Example 5 is shown. In Example 5, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 5, the micro-nano structure 112 is located on the side of the substrate 111 close to the image side. Some parameters of the optical system 100 in Example 5 are shown in Table 13.

[0207] Table 13. Partial parameters of the optical system 100 in Example 5

[0208] parameter data Total optical length (TTL) 10.30mm Maximum field of view (FOV) 78° F-number 1.60 Effective focal length 8.60mm Working band Visible light

[0209] As can be seen from Table 13, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.30 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 78°. The F number (aperture) of the optical system 100 in this embodiment is 1.60, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.60 mm.

[0210] The optical system 100 in this embodiment has an MTF greater than 0.84 at the center field of view at 100 lp / mm, an MTF greater than 0.75 at the 0.5 field of view, an MTF greater than 0.7 at the 0.7 field of view, and an MTF greater than 0.61 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 78°, which can meet the field of view angle requirements of wide-angle lenses.

[0211] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 14.

[0212] Table 14. Parameters of various surfaces in the optical system 100 provided in Example 5

[0213]

[0214]

[0215] For each surface in Table 14, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. Surface 6 is the surface of the super lens 11 close to the object side, and the surface of the super lens 11 close to the image side is surface 7, and the micro-nano structure 112 is located on surface 7. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0216] For the analysis of Table 14, reference may be made to Example 1, and Table 14 will not be analyzed here.

[0217] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0218]

[0219] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D... of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 15.

[0220] Table 15. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 5

[0221] Surface 2 Surface 3 Surface 4 Surface 5 Surface 8 Surface 9 Surface 10 Surface 11 K 2.3E-01 1.3E+00 -2.8E+00 3.4E+00 5.7E+01 1.0E+02 1.0E+02 -2.5E+00 4 times -1.0E-03 -2.4E-03 -1.2E-02 -1.2E-02 5.6E-03 4.6E-03 1.7E-03 1.5E-03 6 times 2.2E-04 4.4E-05 -1.2E-03 -1.1E-03 -1.7E-03 -9.3E-04 -4.6E-03 -1.9E-03 8 times -7.6E-05 4.7E-06 5.5E-04 3.2E-04 3.9E-04 1.8E-04 4.6E-04 3.3E-05 10 times 9.7E-06 3.6E-06 -6.2E-05 -5.3E-05 -7.6E-05 9.8E-05 -6.4E-05 2.9E-05 12 times -5.1E-07 -5.2E-07 -5.0E-07 2.3E-06 -5.8E-06 -5.0E-05 5.4E-07 -3.1E-06 14 times 0.0E+00 0.0E+00 3.9E-07 3.2E-07 3.0E-06 7.2E-06 1.8E-06 3.3E-07 16 times 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 Surface 12 Surface 13 Surface 14 Surface 15 Surface 16 Surface 17 Surface 18 Surface 19 K 4.4E+00 -9.8E+01 4.1E+01 -1.0E+02 -5.7E+01 -8.3E+00 -9.9E-01 -6.2E+01 4 times -1.1E-02 -1.5E-02 -6.5E-04 -2.5E-03 -5.0E-03 -4.1E-04 -4.1E-03 -4.9E-03 6 times 2.7E-03 1.2E-03 -1.5E-03 -6.4E-04 -1.7E-03 -1.6E-03 2.9E-04 4.2E-04 8 times 1.1E-05 -1.3E-04 9.1E-05 3.9E-05 8.3E-05 9.1E-05 4.0E-06 -2.5E-05 10 times -5.4E-05 1.1E-05 -4.8E-06 -2.3E-06 1.3E-05 2.7E-06 -2.2E-07 5.7E-07 12 times 3.2E-06 8.6E-07 -2.1E-07 1.6E-07 -1.2E-06 -5.6E-08 -9.5E-09 2.1E-09 14 times 8.7E-08 -4.3E-08 2.4E-08 -1.3E-08 -1.6E-08 -1.4E-08 2.3E-10 -2.6E-10 16 times -1.0E-08 -1.3E-08 1.4E-09 5.5E-10 5.1E-09 2.2E-10 6.3E-12 1.4E-13 18 times 0.0E+00 0.0E+00 0.0E+00 0.0E+00 -1.1E-10 1.0E-11 -9.8E-14 4.7E-14 20 times 0.0E+00 0.0E+00 0.0E+00 0.0E+00 -3.4E-12 -1.0E-13 -2.9E-15 1.2E-15 22 times 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 0.0E+00 4.5E-17 -2.5E-17

[0222] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 15. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0223] See also Fig.14 , Fig.14 : shows a field curvature diagram of the optical system 100 in Example 5, Fig.14 The T curve in is the meridional field curvature. Fig.14 The S curve in is the sagittal field curvature. Fig.14 It can be seen that the field curvature of the optical system 100 in Example 5 in the meridional direction is 0.0824 mm, and the field curvature of the optical system 100 in Example 5 in the sagittal direction is 0.0476 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0224] See also Fig.15 , Fig.15 The distortion diagram of the optical system 100 in Example 5 is shown. Fig.15 It can be seen that the maximum distortion of the optical system 100 in Example 5 is 1.7570%, which meets the distortion requirement of the excellent imaging quality standard.

[0225] Example 6

[0226] Fig.16 The schematic diagram of the architecture layout of the optical system 100 in Example 6 is shown. In Example 6, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 6, the micro-nano structure 112 is located on the side of the substrate 111 close to the image side. Some parameters of the optical system 100 in Example 6 are shown in Table 16.

[0227] Table 16. Partial parameters of the optical system 100 in Example 6

[0228] parameter data Total optical length (TTL) 10.31mm Maximum field of view (FOV) 88° F-number 1.60 Effective focal length 8.50mm Working band Visible light

[0229] As can be seen from Table 16, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.31 mm. The optical system 100 in this embodiment has a large field of view, and its field of view is 88°. The F number (aperture) of the optical system 100 in this embodiment is 1.60, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.50 mm.

[0230] The optical system 100 in this embodiment has an MTF greater than 0.78 at the center field of view at 100 lp / mm, an MTF greater than 0.72 at the 0.5 field of view, an MTF greater than 0.68 at the 0.7 field of view, and an MTF greater than 0.57 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 88°, which can meet the field of view angle requirements of wide-angle lenses.

[0231] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 17.

[0232] Table 17. Parameters of various surfaces in the optical system 100 provided in Example 6

[0233]

[0234]

[0235] For each surface in Table 17, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. Surface 6 is the surface of the super lens 11 close to the object side, and the surface of the super lens 11 close to the image side is surface 7, and the micro-nano structure 112 is located on surface 7. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0236] For the analysis of Table 17, reference may be made to Example 1, and Table 17 will not be analyzed here.

[0237] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0238]

[0239] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D, etc. of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 18.

[0240] Table 18. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 6

[0241]

[0242]

[0243] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 18. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0244] See also Fig.17 , Fig.17 FIG. 4 shows a field curvature diagram of the optical system 100 in Example 6 under light having a wavelength of 555 nanometers. Fig.17 The T curve in is the meridional field curvature. Fig.17 The S curve in the figure is the sagittal field curvature. Fig.17 The horizontal axis is the field curvature, and its unit is millimeter. Fig.17 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Fig.17 It can be seen that the field curvature of the optical system 100 in Example 6 in the meridional direction is 0.3163 mm, and the field curvature of the optical system 100 in Example 6 in the sagittal direction is 0.0609 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0245] See also Fig.18 , Fig.18 The distortion diagram of the optical system 100 in Example 6 under light with a wavelength of 555 nanometers is shown. Fig.18 It can be seen that the maximum distortion of the optical system 100 in Example 6 is 2.4356%, which meets the distortion requirement of the excellent imaging quality standard.

[0246] Example 7

[0247] Fig.19 The schematic diagram of the architecture layout of the optical system 100 in Example 7 is shown. In Example 7, the optical system 100 includes, from the object side to the image side along the optical axis S, an aperture 3, a first lens 21, a second lens 22, a super lens 11, a third lens 23, a fourth lens 24, a fifth lens 25, a sixth lens 26, a seventh lens 27, and an eighth lens 28. In Example 7, the micro-nano structure 112 is located on the side of the substrate 111 close to the image side. Some parameters of the optical system 100 in Example 7 are shown in Table 19.

[0248] Table 19. Partial parameters of the optical system 100 in Example 7

[0249]

[0250]

[0251] As can be seen from Table 19, the working band of the optical system 100 in this embodiment is visible light, and the total optical length of the optical system 100 in this embodiment is 10.30 mm. The optical system 100 in this embodiment has a large field of view, and its field of view angle is 70°. The F number (aperture) of the optical system 100 in this embodiment is 1.57, which can greatly increase the amount of light entering the optical system 100, and when the image sensor has a low response to light energy, the energy entering the optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality. The effective focal length of the optical system 100 in this embodiment is 8.65 mm.

[0252] The optical system 100 in this embodiment has an MTF greater than 0.84 at the center field of view at 100 lp / mm, an MTF greater than 0.75 at the 0.5 field of view, an MTF greater than 0.7 at the 0.7 field of view, and an MTF greater than 0.61 at the 0.8 field of view. It can be seen that the performance of this embodiment can obviously meet the performance requirements of conventional optical lens groups, and the total optical length of the optical system 100 is relatively short. At the same time, the maximum field of view angle of the optical system 100 in this embodiment is 70°, which can meet the field of view angle requirements of wide-angle lenses.

[0253] Starting from the aperture 3, along the optical axis S from the object side to the image side, each surface in the optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 20.

[0254] Table 20. Parameters of various surfaces in the optical system 100 provided in Example 7

[0255]

[0256]

[0257] For each surface in Table 20, surface 1 is the aperture 3. Surface 2 is the surface of the first lens 21 close to the object side, and surface 3 is the surface of the first lens 21 close to the image side. Surface 4 is the surface of the second lens 22 close to the object side, and surface 5 is the surface of the second lens 22 close to the image side. Surface 6 is the surface of the super lens 11 close to the object side, and the surface of the super lens 11 close to the image side is surface 7, and the micro-nano structure 112 is located on surface 7. Surface 8 is the surface of the third lens 23 close to the object side, and surface 9 is the surface of the third lens 23 close to the image side. Surface 10 is the surface of the fourth lens 24 close to the object side, and surface 11 is the surface of the fourth lens 24 close to the image side. Surface 12 is the surface of the fifth lens 25 close to the object side, and surface 13 is the surface of the fifth lens 25 close to the image side. Surface 14 is the surface of the sixth lens 26 close to the object side, and surface 15 is the surface of the sixth lens 26 close to the image side. Surface 16 is the surface of the seventh lens 27 close to the object side, and surface 17 is the surface of the seventh lens 27 close to the image side. Surface 18 is the surface of the eighth lens 28 close to the object side, and surface 19 is the surface of the eighth lens 28 close to the image side. Surface 20 is the surface of the optical protection member 4 close to the object side, and surface 21 is the surface of the optical protection member 4 close to the image side. Surface 22 is the image surface B.

[0258] For the analysis of Table 20, reference may be made to Example 1, and Table 20 will not be analyzed here.

[0259] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0260]

[0261] Among them, Z(r) is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis S direction; c is the surface curvature of the aspherical surface, c=1 / R, R is the radius of curvature of the aspherical surface; k is the cone coefficient; A, B, C, D are the aspherical coefficients. The values ​​of k, A, B, C, D... of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 21.

[0262] Table 21. Coefficients of the even-order aspheric surfaces in the optical system 100 provided in Example 7

[0263]

[0264] The K, A, B, C, D, E, F, G, H, I, and J values ​​of surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, surface 15, surface 16, surface 17, surface 18, and surface 19 can all be obtained from Table 21. The specific query method can be referred to Example 1, and the specific query method will not be repeated here.

[0265] See also Fig. 20 , Fig. 20 1 shows a field curvature diagram of the optical system 100 in Example 7 under light with a wavelength of 555 nanometers, Fig. 20 The T curve in is the meridional field curvature. Figure 5 The S curve in the figure is the sagittal field curvature. Fig. 20 The horizontal axis is the field curvature, and its unit is millimeter. Fig. 20 The vertical coordinate is the field of view angle, and its unit is degree, which is given by Fig. 20 It can be seen that the field curvature of the optical system 100 in Example 7 in the meridional direction is 0.0838 mm, and the field curvature of the optical system 100 in Example 7 in the sagittal direction is 0.0610 mm, which meets the requirements for field curvature in the excellent imaging quality standard.

[0266] See also Fig.21 , Fig.21 The distortion diagram of the optical system 100 in Example 7 under light with a wavelength of 555 nanometers is shown. Fig.21 It can be seen that the maximum distortion of the optical system 100 in Example 7 is 2.0124%, which meets the distortion requirement of the excellent imaging quality standard.

[0267] After summarizing the various parameters of the optical system 100 provided by the above 7 embodiments, the following Table 22 is obtained. The display of Table 22 is mainly used to illustrate that the various conditions satisfied by the optical system 100 provided by the present application are all verified and supported by experiments.

[0268] Table 22. Parameters of the optical system 100 provided in various embodiments

[0269]

[0270]

[0271] Continued Table 22.

[0272]

[0273] The present application also provides an optical lens (not shown), the optical lens includes an image sensor and the above optical system 100, wherein the architecture of the optical system 100 can be referred to above and will not be described again in this article. The image sensor is arranged on the image plane B of the optical system 100, and the image sensor includes but is not limited to CMOS (Complementary Metal Oxide Semiconductor, referred to as CMOS, complementary metal oxide semiconductor) and CCD (Charge Coupled Device, referred to as CCD, charge coupled device).

[0274] The present application also provides an electronic device, which includes the above optical lens. The electronic device includes but is not limited to mobile terminals such as mobile phones and tablet computers.

[0275] Those skilled in the art will readily appreciate 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 modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. An optical system, characterized in that: The optical system includes a super lens and a refractive lens group, wherein the refractive lens group includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens in sequence, wherein a surface of the first lens close to the object side is convex toward the object side, and a surface of the first lens close to the image side is convex toward the object side, the first lens and the seventh lens are both positive lenses, and the fifth lens and the eighth lens are both negative lenses; the super lens is a positive lens, and the super lens is arranged between any two adjacent lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens; or, the super lens is arranged on a side of the first lens close to the object side; or, the super lens is arranged on a side of the eighth lens close to the image side.

2. The optical system according to claim 1, characterized in that The super lens is disposed between the second lens and the third lens.

3. The optical system according to claim 2, characterized in that The optical system satisfies: Among them, the TTL is the total optical length of the optical system, the ImgH is the imaging area radius of the optical system on the image plane corresponding to the maximum half field of view angle, the BFL is the optical back focal length of the optical system, and f is the effective focal length of the optical system.

4. The optical system according to claim 2, characterized in that The optical system satisfies: Wherein, the TTL is the total optical length of the optical system, and the f m is the focal length of the metalens, and F# is the aperture number of the optical system.

5. The optical system according to claim 2, characterized in that The optical system satisfies: Wherein, R1 is the curvature radius of the surface of the first lens close to the object side, R2 is the curvature radius of the surface of the first lens close to the image side, f1 is the focal length of the first lens, and f is the effective focal length of the optical system.

6. The optical system according to claim 2, characterized in that The optical system satisfies: Among them, the f m is the focal length of the metalens, ImgH is the imaging area radius of the optical system on the image plane corresponding to the maximum half field of view angle, and f is the effective focal length of the optical system.

7. The optical system according to claim 2, characterized in that The optical system satisfies: 0.115D≤ΔΦ m ≤3.12D, where the ΔΦ m is the difference between the maximum optical power of the metalens and the minimum optical power of the metalens.

8. The optical system according to claim 2, characterized in that The optical system satisfies: Among them, the f m is the focal length of the superlens, and r m is the effective area radius of the metalens, is the maximum phase value provided by the metalens, and f is the effective focal length of the optical system.

9. The optical system according to claim 2, characterized in that The optical system satisfies: Among them, the Φ m is the optical power of the metalens, the T m is the thickness of the super lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens having the largest ratio of optical power to thickness is the target lens, and the Φ a is the focal length of the target lens, the T a is the thickness of the target lens.

10. The optical system according to claim 2, characterized in that The optical system satisfies: Wherein, f is the effective focal length of the optical system, and D is the entrance pupil diameter of the optical system.

11. The optical system according to any one of claims 1 to 10, characterized in that: The optical system further comprises an aperture, which is arranged between any two adjacent lenses; or, Along the direction from the object side to the image side, the aperture stop is arranged on a side of the first lens close to the object side; or, Along the direction from the object side to the image side, the aperture stop is arranged on a side of the last lens close to the image side.

12. An optical lens, characterized in that: include: An image sensor and an optical system as described in any one of claims 1 to 11, wherein the image sensor is arranged on the image plane of the optical system.

13. An electronic device, characterized in that: Comprising the optical lens as claimed in claim 12.

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