Visible light optical system and visible light optical lens

Abstract

The utility model discloses a visible light optical system and a visible light optical lens. The visible light optical system comprises a first aspheric lens, a second aspheric lens, a super lens, a third aspheric lens, a fourth aspheric lens, a fifth aspheric lens and a sixth aspheric lens. The focal powers of the first aspheric lens, the super lens and the fifth aspheric lens are positive; the object side surface and the image side surface of the first aspheric lens are convex towards the object side; the object side surface and the image side surface of the second aspheric lens are convex towards the object side; the super lens comprises a substrate and a micro-nano structure, wherein the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the focal power of the fourth aspheric lens and the sixth aspheric lens is negative; the image side surface of the fifth aspheric lens protrudes towards the image side; wherein the sixth aspheric lens has the maximum focal power among the lenses with negative focal power. The visible light optical system provided by the utility model is relatively excellent in imaging quality, and the visible light optical system is relatively small in size.

Description

Technical Field

[0001] The present application relates to the field of optical systems, and in particular to a visible light optical system and a visible light optical lens. Background Art

[0002] Visible light optical systems are widely used in various electronic devices. In order to improve user experience and portability, electronic devices generally develop towards miniaturization and lightness, resulting in a generally smaller installation space reserved for visible light optical systems in electronic devices. Therefore, if the visible light optical system is large in size, it will not be able to be installed in the electronic device.

[0003] In the prior art, some optical systems compress the volume of the visible light optical system by compressing the total optical length or reducing the number of lenses. Although this method can obtain a smaller visible light optical system, the imaging quality of the obtained visible light optical system is relatively average. Utility Model Content

[0004] In view of the above technical problems, the embodiments of the present application provide a visible light optical system and a visible light optical lens, aiming to provide a visible light optical system and a visible light optical lens with a small size and good imaging quality.

[0005] According to one aspect of an embodiment of the present application, a visible light optical system is disclosed, characterized in that the visible light optical system includes, in order from the object side to the image side along the optical axis: a first aspheric lens, a second aspheric lens, a super lens, a third aspheric lens, a fourth aspheric lens, a fifth aspheric lens and a sixth aspheric lens; the optical power of the first aspheric lens is positive, the object side surface of the first aspheric lens is convex to the object side, and the image side surface of the first aspheric lens is convex to the object side; the object side surface of the second aspheric lens is convex to the object side, and the image side surface of the second aspheric lens is convex to the object side; the optical power of the super lens is positive, the super lens includes a substrate and a micro-nano structure, and the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the optical power of the fourth aspheric lens is negative; the optical power of the fifth aspheric lens is positive, and the image side surface of the fifth aspheric lens is convex to the image side; the optical power of the sixth aspheric lens is negative;

[0006] The sixth aspherical lens has the largest optical power among the lenses with negative optical power.

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

[0008] In some embodiments, the visible light optical system satisfies: Wherein, f is the effective focal length of the visible light optical system, and f m is the focal length of the superlens, and the f 1 is the focal length of the first aspheric lens, and the f 2 is the focal length of the second aspheric lens, the f 3 is the focal length of the third aspheric lens, and the f 4 is the focal length of the fourth aspheric lens, and the f 5 is the focal length of the fifth aspheric lens, and the f 6 is the focal length of the sixth aspheric lens.

[0009] In some embodiments, the visible light optical system satisfies: Among them, the f 1 is the focal length of the first aspheric lens, and the f 5 is the focal length of the fifth aspheric lens, and the f 6 is the focal length of the sixth aspheric lens.

[0010] In some embodiments, the visible light optical system satisfies: Among them, the R 1 is the radius of curvature of the object side of the first aspheric lens, and the R 2 is the radius of curvature of the image side surface of the first aspheric lens, and the f 1 is the focal length of the first aspheric lens, and f is the effective focal length of the visible light optical system.

[0011] In some embodiments, the visible light optical system satisfies: Among them, the D 1 is the maximum effective diameter of the first aspheric lens, and the D 6 is the maximum effective diameter of the sixth aspheric lens, ImgH is the imaging area radius of the visible light optical system on the image plane corresponding to the maximum half field angle, and L 16 is the distance between the object-side surface of the first aspheric lens and the image-side surface of the sixth aspheric lens on the optical axis.

[0012] In some embodiments, the visible light optical system satisfies: Among them, the CT 1 is the center thickness of the first aspheric lens, the CT 2 is the center thickness of the second aspheric lens, the CT mis the center thickness of the metalens, the CT 3 is the center thickness of the third aspheric lens, the CT 4 is the center thickness of the fourth aspheric lens, the CT 5 is the center thickness of the fifth aspheric lens, the CT 6 is the center thickness of the sixth aspheric lens; 12 is the thickness of the air gap between the first aspheric lens and the second aspheric lens on the optical axis, the AT 2m is the thickness of the air gap between the second aspheric lens and the super lens on the optical axis, the AT m3 is the thickness of the air gap between the super lens and the third aspheric lens on the optical axis, the AT 34 is the thickness of the air gap between the third aspheric lens and the fourth aspheric lens on the optical axis, and the AT 45 is the thickness of the air gap between the fourth aspheric lens and the fifth aspheric lens on the optical axis, and the AT 56 is the thickness of the air space between the fifth aspheric lens and the sixth aspheric lens on the optical axis.

[0013] In some embodiments, the visible light optical system satisfies: Among them, the Sag 1 is the projection of the distance between the first point and the second point on the optical axis, the first point is the intersection of the object side surface of the first aspheric lens and the optical axis, and the second point is the point on the object side surface of the first aspheric surface corresponding to the maximum effective diameter; if the second point is located on the object side of the first point, then the Sag 1 is a negative value. If the second point is located on the image side of the first point, then the Sag 1 is a positive value; 1 is the radius of curvature of the object side surface of the first aspheric lens.

[0014] In some embodiments, the visible light optical system further includes an aperture stop, and the aperture stop is disposed on the object side of the first aspheric lens; or, the first aspheric lens is disposed between any two adjacent lenses.

[0015] A second aspect of an embodiment of the present application provides a visible light optical lens, comprising: an image sensor and a visible light optical system as described in any one of the above items; the image sensor is arranged on an image plane of the visible light optical system.

[0016] The visible light optical system provided by the present application includes, from the object side to the image side along the optical axis, a first aspheric lens, a second aspheric lens, a super lens, a third aspheric lens, a fourth aspheric lens, a fifth aspheric lens and a sixth aspheric lens in sequence; the optical power of the first aspheric lens is positive, the object side surface of the first aspheric lens is convex to the object side, and the image side surface of the first aspheric lens is convex to the object side; the object side surface of the second aspheric lens is convex to the object side, and the image side surface of the second aspheric lens is convex to the object side; the optical power of the super lens is positive, the super lens includes a substrate and a micro-nano structure, and the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the optical power of the fourth aspheric lens is negative; the optical power of the fifth aspheric lens is positive, and the image side surface of the fifth aspheric lens is convex to the image side; the optical power of the sixth aspheric lens is negative; wherein the sixth aspheric lens has the largest optical power among the lenses with negative optical power. The imaging quality of the visible light optical system provided in the present application is relatively excellent, and the total optical length of the visible light optical system is relatively small. Therefore, the visible light optical system has a relatively small volume and can be installed in a narrow space and can be widely installed in various electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of the architecture layout of a visible light optical system in an embodiment of the present application is shown.

[0019] Figure 2 A field curvature curve diagram of a visible light optical system in an embodiment of the present application is shown.

[0020] Figure 3 A distortion diagram of a visible light optical system in an embodiment of the present application is shown.

[0021] Figure 4 A schematic diagram of the architecture layout of a visible light optical system in an embodiment of the present application is shown.

[0022] Figure 5 A field curvature curve diagram of a visible light optical system in an embodiment of the present application is shown.

[0023] Figure 6 A distortion diagram of a visible light optical system in an embodiment of the present application is shown.

[0024] Figure 7 A schematic diagram of the architecture layout of a visible light optical system in an embodiment of the present application is shown.

[0025] Figure 8 A field curvature curve diagram of a visible light optical system in an embodiment of the present application is shown.

[0026] Fig. 9 A distortion diagram of a visible light optical system in an embodiment of the present application is shown.

[0027] Fig.10 A schematic diagram of the architecture layout of a visible light optical system in an embodiment of the present application is shown.

[0028] Fig.11 A field curvature curve diagram of a visible light optical system in an embodiment of the present application is shown.

[0029] Fig.12 A distortion diagram of a visible light optical system in an embodiment of the present application is shown.

[0030] Reference numerals

[0031] 100. Visible light optical system;

[0032] 10. A first aspheric lens;

[0033] 20. A second aspheric lens;

[0034] 30. Super lens; 310. Substrate; 320. Micro-nano structure;

[0035] 40. A third aspherical lens;

[0036] 50. a fourth aspheric lens;

[0037] 60. The fifth aspherical lens;

[0038] 70. Sixth aspherical lens;

[0039] 80. Aperture;

[0040] 90. Protective glass;

[0041] A, object plane; B, image plane; S, optical axis. DETAILED DESCRIPTION

[0042] 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.

[0043] 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 obscure.

[0044] See also Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of the structure layout of a visible light optical system 100 in an embodiment of the present application, wherein the optical axis S is the center line of the light beam. Figure 1 In the figure, the object to be measured is located on the left side of the visible light optical system 100, that is, the object side is located on the left side of the visible light optical system 100, and the object plane A is located on the object side. The image formed by the visible light 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.

[0045] The side of each optical element of the visible light optical system 100 close to the object side is the object side of the corresponding optical element, and the side of each optical element of the visible light optical system 100 close to the image side is the image side of the corresponding optical element. For example, the side of the aperture 80 close to the object side is the object side of the aperture 80. The surface of each optical element of the visible light optical system 100 close to the object side is the object side surface of the corresponding optical element, and the surface of each optical element of the visible light optical system 100 close to the image side is the image side surface of the corresponding optical element. For example, the surface of the aperture 80 close to the image side is the image side surface of the aperture 80.

[0046] The visible light optical system 100 includes a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60 and a sixth aspheric lens 70. The first aspheric lens 10, the second aspheric lens 20, the super lens 30, the third aspheric lens 40, the fourth aspheric lens 50, the fifth aspheric lens 60 and the sixth aspheric lens 70 are arranged in sequence along the optical axis S from the object side to the image side.

[0047] The first aspheric lens 10 has a positive refractive power, an object-side surface of the first aspheric lens 10 is convex toward the object side, and an image-side surface of the first aspheric lens 10 is convex toward the object side.

[0048] The optical power of the second aspheric lens 20 can be positive or negative. Specifically, in some embodiments, the optical power of the second aspheric lens 20 is positive; in other embodiments, the optical power of the second aspheric lens 20 is negative. The object side surface of the second aspheric lens 20 is convex to the object side, and the image side surface of the second aspheric lens 20 is convex to the object side.

[0049] The optical focal length of the superlens 30 is positive. The superlens 30 includes a substrate 310 and a micro-nano structure 320. The micro-nano structure 320 is arranged on the object side and / or image side of the substrate 310. 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 320, so that the superlens 30 has the expected optical performance.

[0050] The optical power of the third aspherical lens 40 can be positive or negative. Specifically, in some embodiments, the optical power of the third aspherical lens 40 is positive; in other embodiments, the optical power of the third aspherical lens 40 is negative.

[0051] The fourth aspherical lens 50 has negative refractive power.

[0052] The fifth aspherical lens 60 has positive refractive power, and the image side surface of the fifth aspherical lens 60 is convex toward the image side.

[0053] The sixth aspherical lens 70 has a negative optical power, wherein the sixth aspherical lens 70 has the largest optical power among the lenses having negative optical power.

[0054] The visible light optical system 100 provided in the present application includes a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60 and a sixth aspheric lens 70 in sequence from the object side to the image side along the optical axis S. The imaging quality of the visible light optical system 100 is relatively good, and the total optical length of the visible light optical system 100 is relatively small. Therefore, the visible light optical system 100 has a small volume, can be installed in a narrow space, and can be widely installed in various electronic products.

[0055] See also Figure 1 , Figure 4 In some embodiments, both the image side surface and the object side surface of the fourth aspheric lens 50 are convex toward the image side, and the paraxial region of the object side surface of the fourth aspheric lens 50 has an inflection point, and the paraxial region of the image side surface of the fourth aspheric lens 50 has an inflection point. In the present application, the "paraxial region" refers to a cylindrical region with the optical axis S as the central axis and a certain length as the radius.

[0056] See also Figure 7 , Fig.10In some embodiments, both the object-side surface and the image-side surface of the fourth aspheric lens 50 are convex toward the image side, and both the object-side surface and the image-side surface of the fourth aspheric lens 50 do not include an inflection point.

[0057] See also Figure 1 , Figure 4 , Figure 7 , Fig.10 In some embodiments, both the object-side surface and the image-side surface of the fifth aspheric lens 60 are convex toward the image side, and a paraxial region of the object-side surface of the fifth aspheric lens 60 has an inflection point.

[0058] See also Figure 1 In some embodiments, the object side surface and the image side surface of the sixth aspheric lens 70 are convex toward the image side, and the edge of the object side surface of the sixth aspheric lens 70 has an inflection point, and the edge of the image side surface of the sixth aspheric lens 70 has an inflection point.

[0059] See also Figure 4 , Figure 7 In some embodiments, the object side surface and the image side surface of the sixth aspheric lens 70 are convex toward the image side, and the edge of the object side surface of the sixth aspheric lens 70 has an inflection point, and the paraxial region of the image side surface of the sixth aspheric lens 70 has an inflection point.

[0060] See also Fig.10 In some embodiments, both the object-side surface and the image-side surface of the sixth aspheric lens 70 are convex toward the image side, and only the edge of the object-side surface of the sixth aspheric lens 70 has an inflection point.

[0061] In some embodiments, the micro-nano structure 320 is disposed on the image side of the substrate 310 .

[0062] In some embodiments, the micro-nano structure 320 is disposed on the object-side surface of the substrate 310 .

[0063] In some embodiments, the object side and the image side of the substrate 310 are both provided with micro-nano structures 320 so that the metalens 30 has a higher degree of design freedom.

[0064] In some embodiments, the micro-nano structure 320 is a positive micro-nano structure.

[0065] In some embodiments, the micro-nano structure 320 is a negative micro-nano structure.

[0066] In some embodiments, the micro-nano structure 320 is provided with a layer to make the processing technology of the super lens 30 compatible with the existing semiconductor processing technology, which can facilitate the processing and manufacturing of the super lens 30.

[0067] In some embodiments, the micro-nano structure 320 has two or more layers, so that the superlens 30 has a larger and expected optical focal length.

[0068] For the superlens 30, the position of the micro-nano structure 320, the positive and negative sides of the micro-nano structure 320, and the number of layers of the micro-nano structure 320 can be freely combined as long as the superlens 30 has the expected performance.

[0069] In some embodiments, the phase distribution of metalens 30 satisfies the following formula:

[0070]

[0071]

[0072] Wherein, r is the distance from the center of the superlens 30 to any micro-nanostructure 320, λ is the central wavelength of the working band of the superlens 30, is the phase constant, (x, y) is the two-dimensional coordinate of the surface of the super lens 30, a i , b i 、a ij , b ij are all real coefficients, N is the number of phase coefficients, f m is the focal length of the superlens 30.

[0073] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 1: Wherein, F is the aperture number of the visible light optical system 100, f m is the focal length of the metalens 30, and TTL (Total Track Length, abbreviated as TTL) is the total optical length of the visible light optical system 100. m , TTL have the same dimension, both are length units, such as millimeters.

[0074] The upper limit of conditional formula 1 can ensure that the visible light optical system 100 has a sufficient amount of light input, and at the same time, the upper limit of conditional formula 1 can also ensure that the metalens 30 has sufficient light control capability in the visible light optical system 100. The lower limit of conditional formula 1 can ensure that the visible light optical system 100 has a short total optical length while having a sufficiently large amount of light input, so that the visible light optical system 100 has a small volume while having a sufficiently large amount of light input.

[0075] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 2: Wherein, f is the effective focal length of the visible light optical system 100, and f m is the focal length of the superlens 30, f 1 is the focal length of the first aspheric lens 10, f 2 is the focal length of the second aspherical lens 20, f 3 is the focal length of the third aspheric lens 40, f4 is the focal length of the fourth aspherical lens 50, f 5 is the focal length of the fifth aspherical lens 60, f 6 is the focal length of the sixth aspherical lens 70. f, f m 、f 1 、f 2 、f 3 、f 4 、f 5 、f 6 have the same dimension, which is a unit of length, such as millimeter.

[0076] Conditional expression 2 reflects the relationship between the optical powers of the lenses in the visible light optical system 100 . The optical powers can be reasonably distributed through conditional expression 2, which is beneficial to reducing the aberration of the visible light optical system 100 and improving the imaging quality of the visible light optical system 100 .

[0077] In some embodiments, the visible light optical system 100 satisfies Condition 3: Among them, f 1 is the focal length of the first aspheric lens 10, f 5 is the focal length of the fifth aspherical lens 60, f 6 is the focal length of the sixth aspherical lens 70. 1 、f 5 、f 6 have the same dimension, which is a unit of length, such as millimeter.

[0078] The first aspheric lens 10, the fifth aspheric lens 60 and the sixth aspheric lens 70 bear the main optical focal length in the visible light optical system 100. Conditional formula 3 reflects the relationship between the focal lengths of the three lenses that play a major role in regulating light in the visible light optical system 100. Conditional formula 3 can be used to reasonably allocate the optical focal length, thereby reducing the aberration of the visible light optical system 100, and further improving the imaging quality of the visible light optical system 100.

[0079] In some embodiments, the visible light optical system 100 satisfies Condition 4: Among them, R 1 is the radius of curvature of the object side surface of the first aspheric lens 10, R 2 is the curvature radius of the image side surface of the first aspheric lens 10, f 1 R is the focal length of the first aspherical lens 10, and f is the effective focal length of the visible light optical system 100. 1 , R 2 、f 1 , f have the same dimension, both are length units, such as millimeters.

[0080] Conditional formula 4 is used to reasonably control the focal length and surface shape of the first lens in the visible light optical system 100 along the optical axis S from the object side to the image side, so that the first aspherical lens 10 can bear more optical power, and the propagation path of the light entering the visible light optical system 100 can be made smoother, which is beneficial to control the total optical length of the visible light optical system 100 and is beneficial to the lens after the first aspherical lens 10 to eliminate the aberration of the visible light optical system 100.

[0081] In some embodiments, the visible light optical system 100 satisfies Condition 5: Among them, D 1 is the maximum effective diameter of the first aspheric lens 10, that is, D 1 D is the diameter of the maximum light transmission area of ​​the first aspherical lens 10. 6 is the maximum effective diameter of the sixth aspheric lens 70, that is, D 6 is the diameter of the maximum light transmission area of ​​the sixth aspherical lens 70. ImgH is the radius of the imaging area of ​​the visible light optical system 100 corresponding to the maximum half field angle on the image plane B, L 16 D is the distance between the object side surface of the first aspheric lens 10 and the image side surface of the sixth aspheric lens 70 on the optical axis S. 1 , D 6 , ImgH, L 16 have the same dimension, which is a unit of length, such as millimeter.

[0082] The upper limit of Conditional Expression 5 can ensure that the visible light optical system 100 has sufficient relative illumination, and the lower limit of Conditional Expression 5 can ensure that the visible light optical system 100 has a smaller volume.

[0083] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 6: Among them, CT 1 is the center thickness of the first aspheric lens 10, CT 2 is the center thickness of the second aspheric lens 20, CT m is the center thickness of the superlens 30, CT 3 is the center thickness of the third aspheric lens 40, CT 4 is the center thickness of the fourth aspheric lens 50, CT 5 is the center thickness of the fifth aspheric lens 60, CT 6 AT is the center thickness of the sixth aspheric lens 70. In the present application, the center thickness of a lens is the thickness of the lens on the optical axis S. 12 is the thickness of the air gap between the first aspheric lens 10 and the second aspheric lens 20 on the optical axis S, AT 2mis the thickness of the air gap between the second aspherical lens 20 and the super lens 30 on the optical axis S, AT m3 is the thickness of the air gap between the super lens 30 and the third aspheric lens 40 on the optical axis S, AT 34 is the thickness of the air gap between the third aspheric lens 40 and the fourth aspheric lens 50 on the optical axis S, AT 45 is the thickness of the air gap between the fourth aspheric lens 50 and the fifth aspheric lens 60 on the optical axis S, AT 56 CT is the thickness of the air space between the fifth aspheric lens 60 and the sixth aspheric lens 70 on the optical axis S. 1 , CT 2 , CT m , CT 3 , CT 4 , CT 5 , CT 6 , AT 12 , AT 2m , AT m3 , AT 34 , AT 45 , AT 56 have the same dimension, which is a unit of length, such as millimeter.

[0084] A spacer element (not shown) is usually disposed in the air space between two adjacent lenses, and the thickness of the air space directly affects the size of the spacer element. The upper limit of conditional formula 6 is used to control the size of the spacer element to intercept stray light. The lower limit of conditional formula 6 can ensure that the visible light optical system 100 has a more compact structure and can compress the volume of the visible light optical system 100.

[0085] In some embodiments, the visible light optical system 100 satisfies Condition 7: Among them, Sag 1 is the projection of the distance between the first point and the second point on the optical axis S, the first point is the intersection of the object side surface of the first aspheric lens 10 and the optical axis S, and the second point is the point on the object side surface of the first aspheric surface corresponding to the maximum effective diameter; if the second point is located on the object side of the first point, then Sag 1 is a negative value. If the second point is on the image side of the first point, then Sag 1 Is a positive value. 1 Sag is the curvature radius of the object side surface of the first aspherical lens 10. 1 , R 1 have the same dimension, which is a unit of length, such as millimeter.

[0086] The upper limit of conditional expression 7 can prevent the first aspheric lens 10 from being too curved, which is beneficial to the production and molding of the first aspheric lens 10. The lower limit of conditional expression 7 can ensure that the first aspheric lens 10 has a suitable thickness, and also helps to reduce the space required for assembling the first aspheric lens 10, so that the first aspheric lens 10 is more compact with other lenses, thereby making the structure of the visible light optical system 100 more compact.

[0087] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 8: Among them, f 1 is the focal length of the first aspheric lens 10, f 6 is the focal length of the sixth aspherical lens 70. 1 、f 6 have the same dimension, which is a unit of length, such as millimeter.

[0088] The first aspheric lens 10 and the sixth aspheric lens 70 bear a larger optical focal length in the visible light optical system 100. Conditional Expression 8 reflects the relationship between the focal lengths of the first aspheric lens 10 and the sixth aspheric lens 70, so that the optical focal length distribution of the visible light optical system 100 is more reasonable, which is beneficial to improving the compactness of the structure of the visible light optical system 100 and improving the imaging quality of the visible light optical system 100.

[0089] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 9: Wherein, f is the effective focal length of the visible light optical system 100, and EPD (Entrance Pupil Diameter, referred to as EPD) is the entrance pupil diameter of the visible light optical system 100. f and EPD have the same dimension, both of which are length units, such as millimeters.

[0090] Conditional formula 9 reflects the aperture size of the visible light optical system 100, that is, the F number of the visible light optical system 100. It can be seen from conditional formula 9 that the F number of the visible light optical system 100 is small, which can greatly increase the amount of light entering the visible light optical system 100, and collect as much energy entering the visible light optical system 100 as possible when the image sensor has a low response to light energy, thereby ensuring excellent imaging quality.

[0091] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 10: Among them, D 3 is the maximum effective diameter of the third aspheric lens 40, D 4 is the maximum effective diameter of the fourth aspheric lens 50, D 5 is the maximum effective diameter of the fifth aspheric lens 60, D 6is the maximum effective diameter of the sixth aspheric lens 70. The maximum effective diameter of the lens in this application refers to the diameter of the maximum light transmission area of ​​the lens, D 3 , D 4 , D 5 , D 6 have the same dimension, which is a unit of length, such as millimeter.

[0092] Conditional formula 10 reflects the ratio of the sum of the maximum effective diameters of the fifth aspheric lens 60 and the sixth aspheric lens 70 to the sum of the maximum effective diameters of the third aspheric lens 40 and the fourth aspheric lens 50. Conditional formula 10 is conducive to controlling the incident angle of the main light of the visible light optical system 100 on the corresponding image sensor, and can improve the image sensor's receiving effect on light.

[0093] In some embodiments, the visible light optical system 100 satisfies Conditional Formula 11: Among them, CT 1 is the center thickness of the first aspheric lens 10, CT 2 is the center thickness of the second aspherical lens 20. CT 1 , CT 2 have the same dimension, which is a unit of length, such as millimeter.

[0094] The conditional expression 11 is used to adjust the position of the light on the lens behind the second aspherical lens 20 along the incident direction, and to adjust the beam width under different field angles, and is also beneficial to the spherical aberration compensation of the visible light optical system 100 .

[0095] In some embodiments, the visible light optical system 100 further includes an aperture 80, which is used to control the amount of light entering the visible light optical system 100 to ensure that the visible light optical system 100 can work effectively and generate high-quality images. The position of the aperture 80 satisfies any of the following conditions:

[0096] 1. The aperture 80 is disposed on the object side of the first aspheric lens 10. Specifically:

[0097] (1) The aperture 80 is disposed on the object side of the first aspheric lens 10, and the aperture 80 is spaced apart from the first aspheric lens 10;

[0098] (2) Please refer to Figure 1 , Figure 4 , Figure 7 and Fig.10 The aperture 80 is disposed on the object side of the first aspheric lens 10 , that is, the aperture 80 is attached to the surface of the first aspheric lens 10 close to the object side.

[0099] Second, the aperture 80 is set between any two adjacent lenses. Here, the "lens" refers to a lens that has a light modulation effect. The specific position of the aperture 80 is as follows:

[0100] (1) The aperture 80 is located between the first aspheric lens 10 and the second aspheric lens 20, and the aperture 80 is attached to the image side surface of the first aspheric lens 10;

[0101] (2) The aperture 80 is located between the first aspheric lens 10 and the second aspheric lens 20, and the aperture 80 is spaced apart from the first aspheric lens 10 and the second aspheric lens 20;

[0102] (3) The aperture 80 is located between the first aspheric lens 10 and the second aspheric lens 20, and the aperture 80 is attached to the object side surface of the second aspheric lens 20;

[0103] (4) The aperture 80 is located between the second aspheric lens 20 and the super lens 30, and the aperture 80 is attached to the image side surface of the second aspheric lens 20;

[0104] (5) The aperture 80 is located between the second aspheric lens 20 and the super lens 30, and the aperture 80 is spaced apart from the second aspheric lens 20 and the super lens 30;

[0105] (6) The aperture 80 is located between the second aspheric lens 20 and the super lens 30, and the aperture 80 is arranged in contact with the object side surface of the super lens 30;

[0106] (7) The aperture 80 is located between the super lens 30 and the third aspheric lens 40, and the aperture 80 is arranged in contact with the image side surface of the super lens 30;

[0107] (8) The aperture 80 is located between the super lens 30 and the third aspheric lens 40, and the aperture 80 is spaced apart from the super lens 30 and the third aspheric lens 40;

[0108] (9) The aperture 80 is located between the super lens 30 and the third aspheric lens 40, and the aperture 80 is attached to the object side surface of the third aspheric lens 40;

[0109] (10) The aperture 80 is located between the third aspheric lens 40 and the fourth aspheric lens 50, and the aperture 80 is arranged in contact with the image side surface of the third aspheric lens 40;

[0110] (11) The aperture 80 is located between the third aspheric lens 40 and the fourth aspheric lens 50, and the aperture 80 is spaced apart from the third aspheric lens 40 and the fourth aspheric lens 50;

[0111] (12) The aperture 80 is located between the third aspheric lens 40 and the fourth aspheric lens 50, and the aperture 80 is attached to the object side surface of the fourth aspheric lens 50;

[0112] (13) The aperture 80 is located between the fourth aspheric lens 50 and the fifth aspheric lens 60, and the aperture 80 is arranged in contact with the image side surface of the fourth aspheric lens 50;

[0113] (14) The aperture 80 is located between the fourth aspheric lens 50 and the fifth aspheric lens 60, and the aperture 80 is spaced apart from the fourth aspheric lens 50 and the fifth aspheric lens 60;

[0114] (15) The aperture 80 is located between the fourth aspheric lens 50 and the fifth aspheric lens 60, and the aperture 80 is attached to the object side surface of the fifth aspheric lens 60;

[0115] (16) The aperture 80 is located between the fifth aspheric lens 60 and the sixth aspheric lens 70, and the aperture 80 is arranged in contact with the image side surface of the fifth aspheric lens 60;

[0116] (17) The aperture 80 is located between the fifth aspheric lens 60 and the sixth aspheric lens 70, and the aperture 80 is spaced apart from the fifth aspheric lens 60 and the sixth aspheric lens 70;

[0117] (18) The aperture 80 is located between the fifth aspheric lens 60 and the sixth aspheric lens 70 , and the aperture 80 is disposed in contact with the object side surface of the sixth aspheric lens 70 .

[0118] Please refer again Figure 1 , Figure 4 , Figure 7 and Fig.10 In some embodiments, the visible light optical system 100 further includes a protective glass 90 , which is used to protect an image sensor of a lens corresponding to the visible light optical system 100 , and the protective glass 90 is located on the image side of the sixth aspherical lens 70 .

[0119] The visible light optical system 100 provided in this application has the following benefits:

[0120] (1) The total optical length is less than 6.2 mm;

[0121] (2) The MTF is greater than 0.2 at the cutoff frequency of 250lp / mm at the maximum field of view;

[0122] (3) Field curvature is less than 0.2 mm and distortion is less than 3%.

[0123] The present application exemplarily provides four visible light optical systems 100 that meet usage requirements in four embodiments. Next, the visible light optical systems 100 provided in the various embodiments of the present application are described in detail.

[0124] Example 1

[0125] Figure 1 FIG. 1 shows a schematic diagram of the architecture layout of the visible light optical system 100 provided in Example 1. Figure 1 The visible light optical system 100 includes, along the optical axis S from the object plane A to the image plane B, an aperture 80, a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60, a sixth aspheric lens 70, and a protective glass 90, wherein the micro-nano structure 320 is disposed on the image side of the substrate 310. Some parameters of the visible light optical system 100 provided in Example 1 are shown in Table 1-1.

[0126] Table 1-1. Partial parameters of the visible light optical system 100 provided in Example 1

[0127] parameter data Total optical length (TTL) 6.003mm Maximum field of view (2ω) 86.0° F-number 1.89 Effective focal length 5.2mm Working band Visible light (400nm-700nm)

[0128] As can be seen from Table 1-1, the operating wavelength band of the visible light optical system 100 is 400 nanometers to 700 nanometers, and the total optical length of the visible light optical system 100 is relatively short, only 6.003 mm, so the volume of the visible light optical system 100 provided in Example 1 is relatively small. The F number of the visible light optical system 100 is 1.89, which can greatly increase the amount of light entering the visible light optical system 100, and when the image sensor has a low response to light energy, the energy entering the visible light optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality.

[0129] Along the optical axis S from the object plane A to the image plane B, starting from the aperture 80, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 1-2.

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

[0131]

[0132]

[0133] For each surface in Table 1-2, surface 1 is the aperture 80, surface 2 is the object side surface of the first aspheric lens 10, and surface 3 is the image side surface of the first aspheric lens 10. Surface 4 is the object side surface of the second aspheric lens 20, and surface 5 is the image side surface of the second aspheric lens 20. Surface 6 is the object side surface of the super lens 30, and surface 7 is the image side surface of the super lens 30. Since the micro-nano structure 320 is located on the image side surface of the super lens 30, surface 7 is recorded as a structural surface. Surface 8 is the object side surface of the third aspheric lens 40, and surface 9 is the image side surface of the third aspheric lens 40. Surface 10 is the object side surface of the fourth aspheric lens 50, and surface 11 is the image side surface of the fourth aspheric lens 50. Surface 12 is the object side surface of the fifth aspheric lens 60, and surface 13 is the image side surface of the fifth aspheric lens 60. Surface 14 is the object side surface of the sixth aspheric lens 70, and surface 15 is the image side surface of the sixth aspheric lens 70. Surface 16 is the object side surface of the protective glass 90, and surface 17 is the image side surface of the protective glass 90. Surface 18 is the image surface B.

[0134] As can be seen from Table 1-2, the radius of curvature of surface 1 is infinite, that is, surface 1 is a plane, and the distance between surface 1 and surface 2 is -0.674 mm, where the negative sign in "-0.674" means that the vertex of surface 2 is convex from surface 1 toward the object side, and the material between surface 1 and surface 2 is air. Surface 2 is an even aspheric surface, the radius of curvature of surface 2 is 1.845 mm, the distance between surface 2 and surface 3 is 0.701 mm, and the refractive index and Abbe number of the material between surface 2 and surface 3 are 1.53 and 57.1 respectively. Surface 3 is an even aspheric surface, the radius of curvature of surface 3 is 4.660 mm, the distance between surface 3 and surface 4 is 0.289 mm, and the material between surface 3 and surface 4 is air. Surface 4 is an even aspheric surface, the radius of curvature of surface 4 is 31.919 mm, the distance between surface 4 and surface 5 is 0.215 mm, and the refractive index and Abbe number of the material between surface 4 and surface 5 are 1.67 and 19.3 respectively. Surface 5 is an even aspheric surface, the radius of curvature of surface 5 is 10.622 mm, the distance between surface 5 and surface 6 is 0.210 mm, and the material between surface 5 and surface 6 is air. 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 0.200 mm, and the refractive index and Abbe number of the material between surface 6 and surface 7 are 1.46 and 67.8 respectively. The radius of curvature of surface 7 is infinite, that is, surface 7 is a plane, the distance between surface 7 and surface 8 is 0.073 mm, and the material between surface 7 and surface 8 is air. Surface 8 is an even aspheric surface, the radius of curvature of surface 8 is 7.058 mm, the distance between surface 8 and surface 9 is 0.337 mm, and the refractive index and Abbe number of the material between surface 8 and surface 9 are 1.52 and 52.1 respectively. Surface 9 is an even aspheric surface, the radius of curvature of surface 9 is 8.251 mm, the distance between surface 9 and surface 10 is 0.338 mm, and the material between surface 9 and surface 10 is air. Surface 10 is an even aspheric surface, the radius of curvature of surface 10 is 16.365 mm, the distance between surface 10 and surface 11 is 0.305 mm, and the refractive index and Abbe number of the material between surface 10 and surface 11 are 1.67 and 19.3 respectively. Surface 11 is an even aspheric surface, the radius of curvature of surface 11 is 11.374 mm, the distance between surface 11 and surface 12 is 0.437 mm, and the material between surface 11 and surface 12 is air. Surface 12 is an even aspheric surface, the radius of curvature of surface 12 is 39.320 mm, the distance between surface 12 and surface 13 is 0.557 mm, and the refractive index and Abbe number of the material between surface 12 and surface 13 are 1.60 and 28.3 respectively. Surface 13 is an even aspheric surface, the radius of curvature of surface 13 is -3.850 mm, the distance between surface 13 and surface 14 is 1.099 mm, and the material between surface 13 and surface 14 is air.Surface 14 is an even aspheric surface, the radius of curvature of surface 14 is -2.024 mm, the distance between surface 14 and surface 15 is 0.500 mm, and the refractive index and Abbe number of the material between surface 14 and surface 15 are 1.60 and 28.3 respectively. Surface 15 is an even aspheric surface, the radius of curvature of surface 15 is -659.106 mm, the distance between surface 15 and surface 16 is 0.432 mm, and the material between surface 15 and surface 16 is air. The radius of curvature of surface 16 is infinite, that is, surface 16 is a plane, the distance between surface 16 and surface 17 is 0.210 mm, and the refractive index and Abbe number of the material between surface 16 and surface 17 are 1.52 and 64.2 respectively. The radius of curvature of surface 17 is infinite, that is, surface 17 is a plane, the distance between surface 17 and surface 18 is 0.100 mm, and the material between surface 17 and surface 18 is air.

[0135] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, and surface 15 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, and surface 15 can all be obtained from Table 1-3.

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

[0139]

[0140] Please refer to Table 1-3. For surface 2, k is -1.2544E-01, A is 2.0417E-03, B is 6.4431E-03, C is -6.2921E-04, D is -1.0867E-03, E is 6.5983E-04, F is 3.0561E-04, and G is -1.4324E-04. The even-order aspheric coefficients of surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, and surface 15 can be obtained from Table 1-3 with reference to surface 2, and will not be elaborated here again.

[0141] See also Figure 2 , Figure 2 : shows a field curvature diagram of the visible light optical system 100 provided in Example 1, Figure 2 The horizontal axis is the field curvature, and its unit is millimeters. Figure 2 The vertical axis is the Y-axis field of view, and its unit is degree. Figure 2 Where S is the field curvature of visible light with a wavelength of 550 nanometers in the sagittal direction, and T is the field curvature of visible light with a wavelength of 550 nanometers in the meridional direction. Figure 2 It can be seen that the maximum field curvature of the visible light optical system 100 in the sagittal direction is 0.06 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction is 0.104 mm, the distortion is small, and the imaging quality of the visible light optical system 100 is excellent.

[0142] See also Figure 3 , Figure 3 is a distortion diagram of the visible light optical system 100 provided in Example 1, Figure 3 The distortion of the visible light optical system 100 provided in Example 1 under 550 nanometer visible light is shown. Figure 3 It can be seen that the maximum distortion of the visible light optical system 100 provided in Example 1 is 2.2%.

[0143] Example 2

[0144] Figure 4 FIG. 1 shows a schematic diagram of the architecture layout of the visible light optical system 100 provided in Example 2. Figure 4 The visible light optical system 100 includes, along the optical axis S from the object plane A to the image plane B, an aperture 80, a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60, a sixth aspheric lens 70, and a protective glass 90, wherein the micro-nano structure 320 is disposed on the image side of the substrate 310. Some parameters of the visible light optical system 100 provided in Example 2 are shown in Table 2-1.

[0145] Table 2-1. Partial parameters of the visible light optical system 100 provided in Example 2

[0146] parameter data Total optical length (TTL) 6.022mm Maximum field of view (2ω) 84.0° F-number 1.91 Effective focal length 5.53mm Working band Visible light (400nm-700nm)

[0147] As can be seen from Table 2-1, the operating wavelength band of the visible light optical system 100 is 400 nanometers to 700 nanometers, and the total optical length of the visible light optical system 100 is relatively short, only 6.022 millimeters, so the volume of the visible light optical system 100 provided in Example 2 is relatively small. The F number of the visible light optical system 100 is 1.91, which can greatly increase the amount of light entering the visible light optical system 100, and when the image sensor has a low response to light energy, the energy entering the visible light optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality.

[0148] Along the optical axis S from the object plane A to the image plane B, starting from the aperture 80, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 2-2.

[0149] Table 2-2. Parameters of various surfaces in the visible light optical system 100 provided in Example 2

[0150] Surface serial number Surface type Curvature radius (mm) Thickness(mm) Refractive Index and Abbe Number of Materials 1 Aperture unlimited -0.707 - 2 even aspherical surface 1.966 0.840 1.54，56.0 3 even aspherical surface 13.533 0.100 - 4 even aspherical surface 7.768 0.196 1.67，19.3 5 even aspherical surface 3.928 0.240 - 6 Spherical unlimited 0.200 1.46，67.8 7 Structural surface unlimited 0.167 - 8 even aspherical surface -25.888 0.400 1.60，28.3 9 even aspherical surface -16.366 0.500 - 10 even aspherical surface 27.554 0.299 1.62，25.9 11 even aspherical surface 8.784 0.300 - 12 even aspherical surface 4.746 0.733 1.51，57.2 13 even aspherical surface -6.597 0.510 14 even aspherical surface -3.750 0.529 1.51，57.2 15 even aspherical surface 3.371 0.328 16 Spherical unlimited 0.210 1.52，64.2 17 Spherical unlimited 0.470 18 Spherical -

[0151] The analysis of each surface in Table 2-2 can refer to Example 1, and this example will not be analyzed in detail.

[0152] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, and surface 15 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0153]

[0154] 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 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 can all be obtained from Table 2-3.

[0155] Table 2-3. Coefficients of the even-order aspheric surfaces in the visible light optical system 100 provided in Example 2

[0156] The method for querying the values ​​of k, A, B, C, D, ... of each even-order aspheric surface through Table 2-3 can refer to Example 1, which will not be repeated in this embodiment.

[0157] See also Figure 5 , Figure 5 : shows a field curvature diagram of the visible light optical system 100 provided in Example 2, Figure 5 The horizontal axis is the field curvature, and its unit is millimeters. Figure 5 The vertical axis is the Y-axis field of view, and its unit is degree. Figure 5 Where S is the field curvature of visible light with a wavelength of 550 nanometers in the sagittal direction, and T is the field curvature of visible light with a wavelength of 550 nanometers in the meridional direction. Figure 5 It can be seen that the maximum field curvature of the visible light optical system 100 in the sagittal direction is 0.068 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction is 0.076 mm, the distortion is small, and the imaging quality of the visible light optical system 100 is excellent.

[0158] See also Figure 6 , Figure 6 is a distortion diagram of the visible light optical system 100 provided in Example 2, Figure 6 The distortion of the visible light optical system 100 provided in Example 2 under visible light of 550 nanometers is shown. Figure 6 It can be seen that the maximum distortion of the visible light optical system 100 provided in Example 2 is 2.5%.

[0159] Example 3

[0160] Figure 7 FIG. 1 shows a schematic diagram of the architecture layout of the visible light optical system 100 provided in Example 3. Figure 7 The visible light optical system 100 includes, along the optical axis S from the object plane A to the image plane B, an aperture 80, a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60, a sixth aspheric lens 70, and a protective glass 90, wherein the micro-nano structure 320 is disposed on the object side of the substrate 310. Some parameters of the visible light optical system 100 provided in Example 3 are shown in Table 3-1.

[0161] Table 3-1. Partial parameters of the visible light optical system 100 provided in Example 3

[0162] parameter data Total optical length (TTL) 6.084mm Maximum field of view (2ω) 86.8° F-number 1.88 Effective focal length 5.40mm Working band Visible light (400nm-700nm)

[0163] As can be seen from Table 3-1, the operating wavelength band of the visible light optical system 100 is 400 nanometers to 700 nanometers, and the total optical length of the visible light optical system 100 is relatively short, only 6.084 millimeters, so the volume of the visible light optical system 100 provided in Example 3 is relatively small. The F number of the visible light optical system 100 is 1.88, which can greatly increase the amount of light entering the visible light optical system 100, and when the image sensor has a low response to light energy, the energy entering the visible light optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality.

[0164] Along the optical axis S from the object plane A to the image plane B, starting from the aperture 80, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 3-2.

[0165] Table 3-2. Parameters of various surfaces in the visible light optical system 100 provided in Example 3

[0166] Surface serial number Surface type Curvature radius (mm) Thickness(mm) Refractive Index and Abbe Number of Materials 1 Aperture unlimited -0.646 - 2 even aspherical surface 1.945 0.679 1.53，55.8 3 even aspherical surface 4.844 0.250 - 4 even aspherical surface 12.855 0.223 1.53，56.1 5 even aspherical surface 13.482 0.120 - 6 Structural surface unlimited 0.200 1.46，67.8 7 Spherical unlimited 0.300 - 8 even aspherical surface -12.530 0.288 1.66，20.4 9 even aspherical surface -23.522 0.223 - 10 even aspherical surface -8.170 0.410 1.66，20.4 11 even aspherical surface -23.163 0.427 - 12 even aspherical surface 7.523 0.461 1.54，55.9 13 even aspherical surface -4.910 1.339 14 even aspherical surface -1.905 0.416 1.51，56.5 15 even aspherical surface 99.898 0.438 16 Spherical unlimited 0.210 1.52，64.2 17 Spherical unlimited 0.100 18 Spherical -

[0167] The analysis of each surface in Table 3-2 can refer to Example 1, and this example will not be analyzed in detail.

[0168] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, and surface 15 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0169]

[0170] 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; c is the 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 can all be obtained from Table 3-3.

[0171] Table 3-3. Coefficients of the even-order aspheric surfaces in the visible light optical system 100 provided in Example 3

[0172]

[0173]

[0174] The method for querying the values ​​of k, A, B, C, D, etc. of each even-order aspheric surface through Table 3-3 can refer to Example 1, which will not be repeated in this example.

[0175] See also Figure 8 , Figure 8 : shows a field curvature diagram of the visible light optical system 100 provided in Example 3, Figure 8 The horizontal axis is the field curvature, and its unit is millimeters. Figure 8 The vertical axis is the Y-axis field of view, and its unit is degree. Figure 8 Where S is the field curvature of visible light with a wavelength of 550 nanometers in the sagittal direction, and T is the field curvature of visible light with a wavelength of 550 nanometers in the meridional direction. Figure 8It can be seen that the maximum field curvature of the visible light optical system 100 in the sagittal direction is 0.088 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction is 0.156 mm, the distortion is small, and the imaging quality of the visible light optical system 100 is excellent.

[0176] See also Fig. 9 , Fig. 9 is a distortion diagram of the visible light optical system 100 provided in Example 3, Fig. 9 The distortion of the visible light optical system 100 provided in Example 3 under visible light of 550 nanometers is shown. Fig. 9 It can be seen that the maximum distortion of the visible light optical system 100 provided in Example 3 is 2.3%.

[0177] Example 4

[0178] Fig.10 FIG. 1 shows a schematic diagram of the architecture layout of the visible light optical system 100 provided in Example 4. Fig.10 The visible light optical system 100 includes, along the optical axis S from the object plane A to the image plane B, an aperture 80, a first aspheric lens 10, a second aspheric lens 20, a super lens 30, a third aspheric lens 40, a fourth aspheric lens 50, a fifth aspheric lens 60, a sixth aspheric lens 70, and a protective glass 90, wherein the micro-nano structure 320 is disposed on the object side of the substrate 310. Some parameters of the visible light optical system 100 provided in Example 4 are shown in Table 4-1.

[0179] Table 4-1. Partial parameters of the visible light optical system 100 provided in Example 4

[0180] parameter data Total optical length (TTL) 6.132mm Maximum field of view (2ω) 84.0° F-number 1.89 Effective focal length 5.46mm Working band Visible light (400nm-700nm)

[0181] As can be seen from Table 4-1, the operating wavelength band of the visible light optical system 100 is 400 nanometers to 700 nanometers, and the total optical length of the visible light optical system 100 is relatively short, only 6.132 millimeters, so the volume of the visible light optical system 100 provided in Example 4 is relatively small. The F number of the visible light optical system 100 is 1.89, which can greatly increase the amount of light entering the visible light optical system 100, and when the image sensor has a low response to light energy, the energy entering the visible light optical system 100 is collected as much as possible, thereby ensuring excellent imaging quality.

[0182] Along the optical axis S from the object plane A to the image plane B, starting from the aperture 80, each surface in the visible light optical system 100 is numbered, and the parameters of each surface are summarized to obtain the following Table 4-2.

[0183] Table 4-2. Parameters of various surfaces in the visible light optical system 100 provided in Example 4

[0184]

[0185]

[0186] The analysis of each surface in Table 4-2 can refer to Example 1, and this example will not be analyzed in detail.

[0187] Surface 2, surface 3, surface 4, surface 5, surface 8, surface 9, surface 10, surface 11, surface 12, surface 13, surface 14, and surface 15 are all even-order aspheric surfaces, and their surface shapes satisfy the following relationship:

[0188]

[0189] 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 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 can all be obtained from Table 4-3.

[0190] Table 4-3. Coefficients of the even-order aspheric surfaces in the visible light optical system 100 provided in Example 4

[0191]

[0192] The method for querying the values ​​of k, A, B, C, D, ... of each even-order aspheric surface through Table 4-3 can refer to Example 1, which will not be repeated in this example.

[0193] See also Fig.11 , Fig.11 : shows a field curvature diagram of the visible light optical system 100 provided in Example 4, Fig.11 The horizontal axis is the field curvature, and its unit is millimeters. Fig.11 The vertical axis is the Y-axis field of view, and its unit is degree. Fig.11 Where S is the field curvature of visible light with a wavelength of 550 nanometers in the sagittal direction, and T is the field curvature of visible light with a wavelength of 550 nanometers in the meridional direction. Fig.11 It can be seen that the maximum field curvature of the visible light optical system 100 in the sagittal direction is 0.012 mm, and the maximum field curvature of the visible light optical system 100 in the meridional direction is 0.044 mm, the distortion is small, and the imaging quality of the visible light optical system 100 is excellent.

[0194] See also Fig.12 , Fig.12This is a distortion diagram of the visible light optical system 100 provided in Example 4, Fig.12 The distortion of the visible light optical system 100 provided in Example 4 under visible light of 550 nanometers is shown. Fig.12 It can be seen that the maximum distortion of the visible light optical system 100 provided in Example 4 is 2.2%.

[0195] After summarizing the various parameters of the visible light optical system 100 provided in the above four embodiments, the following Table 5 is obtained. Table 5 is mainly used to illustrate that the various conditions satisfied by the visible light optical system 100 provided in this application are all verified and supported by experiments.

[0196] Table 5. Parameters of the visible light optical system 100 provided in various embodiments

[0197]

[0198]

[0199] The present application also provides a visible light optical lens (not shown), which includes an imaging detector (not shown) and the above-mentioned visible light optical system 100. The specific architecture of the visible light optical system 100 can be referred to above and will not be repeated here. The imaging detector is arranged on the image plane B of the visible light optical system 100, and the imaging detector 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).

[0200] The application fields of the visible light optical lens provided in the present application include but are not limited to mobile terminals such as mobile phones, tablet computers, and laptop computers.

[0201] 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. A visible light optical system, characterized in that: The visible light optical system includes, from the object side to the image side along the optical axis, a first aspheric lens, a second aspheric lens, a super lens, a third aspheric lens, a fourth aspheric lens, a fifth aspheric lens and a sixth aspheric lens in sequence; the optical power of the first aspheric lens is positive, the object side surface of the first aspheric lens is convex to the object side, and the image side surface of the first aspheric lens is convex to the object side; the object side surface of the second aspheric lens is convex to the object side, and the image side surface of the second aspheric lens is convex to the object side; the optical power of the super lens is positive, the super lens includes a substrate and a micro-nano structure, and the micro-nano structure is arranged on the object side surface and / or the image side surface of the substrate; the optical power of the fourth aspheric lens is negative; the optical power of the fifth aspheric lens is positive, and the image side surface of the fifth aspheric lens is convex to the image side; the optical power of the sixth aspheric lens is negative; The sixth aspherical lens has the largest optical power among the lenses with negative optical power.

2. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Wherein, F is the aperture number of the visible light optical system, and f m is the focal length of the metalens, and TTL is the total optical length of the visible light optical system.

3. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Wherein, f is the effective focal length of the visible light optical system, and f m is the focal length of the superlens, f1 is the focal length of the first aspheric lens, f2 is the focal length of the second aspheric lens, f3 is the focal length of the third aspheric lens, f4 is the focal length of the fourth aspheric lens, f5 is the focal length of the fifth aspheric lens, and f6 is the focal length of the sixth aspheric lens.

4. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Wherein, f1 is the focal length of the first aspheric lens, f5 is the focal length of the fifth aspheric lens, and f6 is the focal length of the sixth aspheric lens.

5. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Among them, R1 is the curvature radius of the object side of the first aspheric lens, R2 is the curvature radius of the image side of the first aspheric lens, f1 is the focal length of the first aspheric lens, and f is the effective focal length of the visible light optical system.

6. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Wherein, D1 is the maximum effective diameter of the first aspheric lens, D6 is the maximum effective diameter of the sixth aspheric lens, ImgH is the imaging area radius of the visible light optical system on the image plane corresponding to the maximum half field angle, and L 16 is the distance between the object-side surface of the first aspheric lens and the image-side surface of the sixth aspheric lens on the optical axis.

7. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Wherein, CT1 is the center thickness of the first aspheric lens, CT2 is the center thickness of the second aspheric lens, and CT m is the center thickness of the super lens, CT3 is the center thickness of the third aspheric lens, CT4 is the center thickness of the fourth aspheric lens, CT5 is the center thickness of the fifth aspheric lens, and CT6 is the center thickness of the sixth aspheric lens; AT 12 is the thickness of the air gap between the first aspheric lens and the second aspheric lens on the optical axis, the AT 2m is the thickness of the air gap between the second aspheric lens and the super lens on the optical axis, the AT m3 is the thickness of the air gap between the super lens and the third aspheric lens on the optical axis, the AT 34 is the thickness of the air gap between the third aspheric lens and the fourth aspheric lens on the optical axis, and the AT 45 is the thickness of the air gap between the fourth aspheric lens and the fifth aspheric lens on the optical axis, and the AT 56 is the thickness of the air space between the fifth aspheric lens and the sixth aspheric lens on the optical axis.

8. The visible light optical system according to claim 1, characterized in that: The visible light optical system satisfies: Among them, the Sag1 is the projection of the distance between the first point and the second point on the optical axis, the first point is the intersection of the object side surface of the first aspheric lens and the optical axis, and the second point is the point on the object side surface of the first aspheric lens corresponding to the maximum effective diameter; if the second point is located on the object side of the first point, the Sag1 is a negative value, and if the second point is located on the image side of the first point, the Sag1 is a positive value; R1 is the radius of curvature of the object side surface of the first aspheric lens.

9. The visible light optical system according to any one of claims 1 to 8, characterized in that: The visible light optical system further includes an aperture stop, which is disposed on the object side of the first aspheric lens; or, the first aspheric lens is disposed between any two adjacent lenses.

10. A visible light optical lens, characterized in that: The visible light optical lens comprises: an image sensor and the visible light optical system according to any one of claims 1 to 9; the image sensor is arranged on the image plane of the visible light optical system.

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