Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, and the six lenses are as follows: a first lens with negative optical power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens with positive optical power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; a third lens with positive optical power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a diaphragm; a fourth lens with positive optical power, the object side surface of which is a convex surface; a fifth lens with negative optical power, the image side surface of which is a convex surface; and a sixth lens with negative optical power, the object side surface of which is a concave surface and the image side surface of which is a convex surface; wherein the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 7.5 < TTL / f < 8.5. Through reasonable collocation of the lens shape and the optical power combination between the lenses, the application realizes the effects of large field of view, high pixel and miniaturization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lens, in particular to an optical lens. BACKGROUND

[0002] With the development of mobile Internet, plus the popularity of social, video, live software, people's love for photography is getting higher and higher, the pursuit of imaging effect is more diversified, both require high-definition image quality, also require a large field of view to shoot a wide range of visual impact strong picture, among them, the unmanned aerial vehicle wins the love of the majority of consumers with its unique high-altitude perspective and wide shooting picture. At present, the unmanned aerial vehicle develops rapidly, and the corresponding requirement for the optical lens matched with it is also higher and higher.

[0003] Since the unmanned aerial vehicle is often used in complex environments such as severe vibration, high pressure and extreme temperature, the performance requirement of the optical lens matched with it is very high, not only good thermal stability to adapt to the harsh outdoor environment, but also light and small appearance and small weight to increase the endurance time of the unmanned aerial vehicle in high-altitude flight shooting; At the same time, the lens is required to have a large field of view to shoot a wide range of pictures. At present, the conventional optical lens on the market is difficult to meet the diversified use requirements of unmanned aerial vehicle. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens which can solve one or more of the above problems.

[0005] To achieve the above purpose, the present application provides an optical lens, which has six lenses, arranged along the optical axis from the object side to the imaging surface in order: a first lens with negative focal power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive focal power, the object side surface of which is concave, and the image side surface of which is convex; a third lens with positive focal power, the object side surface of which is convex, and the image side surface of which is concave; a stop; a fourth lens with positive focal power, the object side surface of which is convex; a fifth lens with negative focal power, the image side surface of which is convex; a sixth lens with negative focal power, the object side surface of which is concave, and the image side surface of which is convex; wherein the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.5 < TTL / f < 8.5.

[0006] Compared with the prior art, the optical lens provided by the present application has the advantages of reasonable focal power distribution, stop position, lens thickness and lens spacing, and has the advantages of large field of view, high pixel and miniaturization. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 The structure diagram of the optical lens of the present application embodiment 1.

[0008] Figure 2 Optical distortion curve of the optical lens in Embodiment 1 of the present application.

[0009] Figure 3 MTF curve of the optical lens in Embodiment 1 of the present application.

[0010] Figure 4 Vignetting curve of the optical lens in Embodiment 1 of the present application.

[0011] Figure 5 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0012] Figure 6 Optical distortion curve of the optical lens in Embodiment 2 of the present application.

[0013] Figure 7 MTF curve of the optical lens in Embodiment 2 of the present application.

[0014] Figure 8 Vignetting curve of the optical lens in Embodiment 2 of the present application.

[0015] Figure 9 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0016] Figure 10 Optical distortion curve of the optical lens in Embodiment 3 of the present application.

[0017] Figure 11 MTF curve of the optical lens in Embodiment 3 of the present application.

[0018] Figure 12 Vignetting curve of the optical lens in Embodiment 3 of the present application. DETAILED DESCRIPTION

[0019] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0020] It should be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0021] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0022] In this document, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0023] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing", when used in this specification, means that the stated features, elements and / or components are present, but does not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, they modify the entire list of features and not the individual elements of the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0024] Unless otherwise defined, all terms used in this document, including technical terms and scientific terms, have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms (such as those defined in a commonly used dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0026] The optical lens according to an embodiment of the present application comprises: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a filter, which are sequentially arranged along an optical axis from an object side to an image side.

[0027] The first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has positive focal power, the object side surface is a concave surface, and the image side surface is a convex surface; the third lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the fourth lens has positive focal power, the object side surface is a convex surface; the fifth lens has negative focal power, and the image side surface is a convex surface; and the sixth lens has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface.

[0028] In some embodiments, a diaphragm can be arranged between the third lens and the fourth lens to condense the range of light rays exiting the front end of the optical lens and reduce the rear end aperture of the optical lens.

[0029] In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens to share the chromatic aberration correction of the optical lens, improve the resolution of the optical lens, and make the structure of the optical lens compact, which is conducive to the miniaturization of the optical lens.

[0030] In some embodiments, the maximum half field angle θ of the optical lens satisfies 70°<θ<90°. Satisfying the above range is conducive to realizing the wide-angle characteristic, so that more scene information can be obtained, and the demand for large-range detection can be met.

[0031] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f satisfy 7.5<TTL / f<8.5. Satisfying the above range can effectively limit the length and volume of the optical lens, and realize the miniaturization of the optical lens.

[0032] In some embodiments, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum half field angle satisfy 6.5<TTL / IH<7.5. Satisfying the above range can realize the balance between miniaturization and a large image. When the value of TTL / IH exceeds the lower limit, the focal power of each lens is too large, which causes the lens to have difficulty in correcting aberration and the resolution to decrease significantly. When the value of TTL / IH exceeds the upper limit, the total length of the optical lens is too long, which is difficult to meet the miniaturization requirement, or the target surface is too small to match a larger chip when the total length is small enough.

[0033] In some embodiments, the effective focal length f of the optical lens and the curvature radius R11 of the object side surface of the first lens satisfy 0.05<f / R11<0.12; and the curvature radius R11 of the object side surface of the first lens and the curvature radius R12 of the image side surface of the first lens satisfy 8.0<R11 / R12<11.5. Satisfying the above range can control the surface shape of the first lens reasonably, which is conducive to guaranteeing the resolution of the optical lens while meeting the processability of the first lens, and is conducive to obtaining a larger field angle.

[0034] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 20 < f2 / f < 40; the curvature radius R21 of the object side of the second lens and the curvature radius R22 of the image side of the second lens satisfy: -25.0 < (R21+R22) / (R21-R22) < -8.0. Satisfying the above range, by reasonably controlling the focal length and the face type of the second lens, the difficulty of correcting aberrations such as distortion is reduced, and the imaging quality of the optical lens is improved.

[0035] In some embodiments, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 7.0 < f2 / f3 < 14.0; the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.2 < CT2 / CT3 < 2.8. Satisfying the above range, the focal length and the thickness of the second lens and the third lens can be reasonably distributed, which is conducive to reducing the high-order aberration of the optical lens, and is also conducive to reducing the total optical length of the optical lens.

[0036] In some embodiments, the central thickness CT3 of the third lens and the effective focal length f of the optical lens satisfy: 0.50 < CT3 / f < 0.65; the air spacing AT23 of the second lens and the third lens on the optical axis and the air spacing AT34 of the third lens and the fourth lens on the optical axis satisfy: 0.4 < AT23 / AT34 < 1.2. Satisfying the above range, by reasonably controlling the thickness of the third lens and the air spacing of the front and rear lenses, the structure of the optical lens is more compact, and the miniaturization of the optical lens is maintained.

[0037] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -1.0 < f4 / f5 < 0. Satisfying the above range, by reasonably adjusting the refractive power of the fourth lens and the fifth lens in the cemented lens, the chromatic aberration correction of the optical lens is facilitated, and the resolving power of the optical lens is improved.

[0038] In some embodiments, the sum ∑AT of the air spacings of the adjacent lenses of the first lens to the sixth lens on the optical axis and the sum ∑CT of the central thicknesses of the lenses of the first lens to the sixth lens satisfy: 0.7 < ∑AT / ∑CT < 0.8. Satisfying the above range, by reasonably distributing the thickness of each lens and the air spacing between the lenses, the optical lens assembly can be ensured, the refractive power can be reasonably distributed, and the miniaturization of the optical lens is facilitated.

[0039] In some embodiments, the air spacing AT56 of the fifth lens and the sixth lens on the optical axis and the distance EFL of the sixth lens and the imaging surface on the optical axis satisfy: 0.02 < AT56 / EFL < 0.03. Satisfying the above range, by reasonably adjusting the air spacing in front of and behind the sixth lens, the assembly requirements of the module and the miniaturization of the optical lens can be well met.

[0040] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -30 < f6 / f < -10; the radius of curvature R61 of the object side surface of the sixth lens and the radius of curvature R62 of the image side surface of the sixth lens satisfy: -4.0 < (R61+R62) / (R61-R62) < -1.0. By satisfying the above range, by reasonably controlling the focal length and surface shape of the sixth lens, the resolving power of the optical lens can be ensured while the processability of the sixth lens is satisfied, the correction difficulty of field curvature and other aberrations is reduced, and the imaging quality of the optical lens is improved.

[0041] In some embodiments, the sum of the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the center thickness CT6 of the sixth lens and the sum of the edge thickness ET4 of the fourth lens, the edge thickness ET5 of the fifth lens, and the edge thickness ET6 of the sixth lens satisfy: 1.1 < (CT4+CT5+CT6) / (ET4+ET5+ET6) < 1.2. By satisfying the above range, the fourth lens to the sixth lens can converge light rays of the optical system and bear a specific optical power, while the volume of the optical lens is reduced and the imaging area of the optical lens is increased.

[0042] In some embodiments, the effective aperture SD1 of the object side surface of the first lens and the effective aperture SD6 of the image side surface of the sixth lens satisfy: 2.7 < SD1 / SD6 < 3.6. By satisfying the above range, by setting the apertures of the first lens and the sixth lens, a good light collecting effect can be achieved, so that the optical lens has a sufficient field of view while ensuring the maximum amount of light.

[0043] In order to make the system have better optical performance, a plurality of aspherical lenses are used in the lens, and each aspherical surface shape of the optical lens satisfies the following equation:

[0044]

[0045] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, A, B, C, D, E, F, and G are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, and fourteenth-order curved surface coefficients, respectively.

[0046] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0047] Embodiment 1

[0048] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application. The optical lens includes, along the optical axis from the object side to the imaging surface S14, a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.

[0049] The first lens L1 has negative optical power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens L2 has positive optical power, the object side S3 is a concave surface, and the image side S4 is a convex surface. The third lens L3 has positive optical power, the object side S5 is a convex surface, and the image side S6 is a concave surface. The fourth lens L4 has positive optical power, the object side S7 is a convex surface, and the image side is a convex surface. The fifth lens L5 has negative optical power, the object side is a concave surface, and the image side S9 is a convex surface. The fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens, and the cemented surface is S8. The sixth lens L6 has negative optical power, the object side S10 is a concave surface, and the image side S11 is a convex surface. The filter G1 has a plane object side S12 and a plane image side S13.

[0050] The related parameters of each lens in the optical lens in the embodiment 1 are shown in Table 1-1.

[0051] Table 1-1

[0052]

[0053] The curve coefficients of the aspherical lens of the optical lens in the embodiment 1 are shown in Table 1-2.

[0054] Table 1-2

[0055]

[0056]

[0057] Figure 2The optical distortion curve of the embodiment 1 is shown, which represents the distortion at different fields of view on the imaging plane, the horizontal axis represents percentage, and the vertical axis represents half field angle (unit: °). It can be seen from the figure that the optical distortion of the embodiment is controlled within-15%, which indicates that the distortion of the optical lens is well corrected.

[0058] Figure 3 The modulation transfer function (MTF) curve of the embodiment 1 is shown, which represents the imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. It can be seen from the figure that the MTF value of the embodiment is above 0.42 within the full field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0059] Figure 4 The curve of the vertical axis chromatic aberration of the embodiment 1 is shown, which represents the chromatic aberration of different image heights on the imaging plane with respect to the central wavelength (0.55 μm) at each wavelength, the horizontal axis represents the vertical axis chromatic aberration value (unit: μm) of each wavelength relative to the central wavelength, and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.0 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the whole image plane.

[0060] Embodiment 2

[0061] Please refer to Figure 5 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. The optical lens in the embodiment is substantially the same as the optical lens in the embodiment 1 in structure and shape, and the difference mainly lies in that the curvature radius, the central thickness, the edge thickness and the material of each lens are changed.

[0062] The related parameters of each lens in the optical lens in the embodiment 2 are shown in Table 2-1.

[0063] Table 2-1

[0064]

[0065]

[0066] The curve coefficients of the aspherical lens of the optical lens in the embodiment 2 are shown in Table 2-2.

[0067] Table 2-2

[0068] Face number K A B C D S3 -4.55E+00 0.00E+00 -4.88E-03 2.56E-04 -1.07E-05 S4 -7.64E+00 0.00E+00 -4.37E-03 3.73E-04 -2.87E-05 S12 -1.37E+01 0.00E+00 -1.48E-02 9.99E-04 -2.33E-04 S13 -4.87E+01 0.00E+00 -9.91E-03 2.68E-04 9.75E-05 Face number E F G S3 -2.67E-07 6.09E-08 -2.20E-09 S4 1.61E-06 -5.31E-08 8.09E-10 S12 7.68E-05 -1.55E-05 2.46E-06 S13 -1.21E-05 -2.69E-06 9.72E-07

[0069] Figures 6 to 8The distortion curve, the modulation transfer function (MTF) curve and the axial color aberration curve of the optical lens of embodiment 2 are shown in the figures respectively. As can be seen from the figures, the optical distortion is controlled within 17%, which indicates that the distortion of the optical lens is well corrected; the MTF value of the optical lens is above 0.48 in the full field of view, and the optical lens has good imaging quality and good detail resolution ability in both low frequency and high frequency cases; the axial color aberration of the longest wavelength and the shortest wavelength is controlled within ±0.4 μm, which indicates that the optical lens can well correct the color aberration of the edge field of view and the secondary spectrum of the whole image plane.

[0070] Embodiment 3

[0071] Please refer to Figure 9 , which is a structural schematic diagram of the optical lens 300 provided in embodiment 3 of the present application. The optical lens in the present embodiment has substantially the same structure and shape as the optical lens in embodiment 1, and the difference mainly lies in that the curvature radius, the center thickness, the edge thickness and the material of each lens are changed.

[0072] The related parameters of each lens in the optical lens in embodiment 3 are shown in Table 3-1.

[0073] Table 3-1

[0074]

[0075]

[0076] The surface coefficients of the aspherical lenses of the optical lens in embodiment 3 are shown in Table 3-2.

[0077] Table 3-2

[0078] Face number K A B C D S3 -5.34E+00 0.00E+00 -4.46E-03 2.42E-04 -1.05E-05 S4 -9.43E+00 0.00E+00 -4.11E-03 3.65E-04 -2.86E-05 S12 -7.45E+01 0.00E+00 -1.48E-02 1.23E-03 -1.47E-04 S13 1.08E+02 0.00E+00 -9.48E-03 5.30E-04 9.47E-05 Face number E F G S3 -2.46E-07 5.88E-08 -2.29E-09 S4 1.59E-06 -5.09E-08 7.08E-10 S12 6.39E-05 -2.03E-05 3.32E-06 S13 -1.51E-05 -2.96E-06 9.48E-07

[0079] Figures 10 to 12 The distortion curve, the modulation transfer function (MTF) curve and the axial color aberration curve of the optical lens of embodiment 3 are shown in the figures respectively. As can be seen from the figures, the optical distortion is controlled within 20%, which indicates that the distortion of the optical lens is well corrected; the MTF value of the optical lens is above 0.5 in the full field of view, and the optical lens has good imaging quality and good detail resolution ability in both low frequency and high frequency cases; the axial color aberration of the longest wavelength and the shortest wavelength is controlled within ±0.5 μm, which indicates that the optical lens can well correct the color aberration of the edge field of view and the secondary spectrum of the whole image plane.

[0080] Please refer to Table 4, which is the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the maximum half field angle θ, the total optical length TTL, the aperture value FNO, the true half image height IH of the optical lens, and the numerical value corresponding to each conditional expression in the embodiment.

[0081] Table 4

[0082]

[0083]

[0084] In summary, the optical lens of the embodiment of the present application realizes the effects of large field of view, high pixels and miniaturization by reasonably matching the lens shape and optical power combination between each lens.

[0085] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis are: a first lens with negative refractive power, an object side surface of the first lens being convex, an image side surface of the first lens being concave; a second lens with positive refractive power, an object side surface of the second lens being concave, an image side surface of the second lens being convex; a third lens with positive refractive power, an object side surface of the third lens being convex, an image side surface of the third lens being concave; a diaphragm; a fourth lens with positive refractive power, an object side surface of the fourth lens being convex; a fifth lens with negative refractive power, an image side surface of the fifth lens being convex; a sixth lens with negative refractive power, an object side surface of the sixth lens being concave, an image side surface of the sixth lens being convex; wherein an overall optical length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 7.5 < TTL / f < 8.5; an overall optical length TTL of the optical lens and an image height IH corresponding to a maximum half field angle of the optical lens satisfy: 6.5 < TTL / IH < 7.

5.

2. The optical lens of claim 1, wherein, an image side surface of the fourth lens is convex, and an object side surface of the fifth lens is concave.

3. The optical lens of claim 1, wherein, an effective focal length f of the optical lens and a curvature radius R1 of an object side surface of the first lens satisfy: 0.05 < f / R1 < 0.

12.

4. The optical lens of claim 1, wherein, an effective focal length f2 of the second lens and an effective focal length f of the optical lens satisfy: 20 < f2 / f < 40.

5. The optical lens of claim 1, wherein, an effective focal length f2 of the second lens and an effective focal length f3 of the third lens satisfy: 7.0 < f2 / f3 < 14.

0.

6. The optical lens of claim 1, wherein, a center thickness CT3 of the third lens and an effective focal length f of the optical lens satisfy: 0.50 < CT3 / f < 0.

65.

7. The optical lens of claim 1, wherein, an effective focal length f4 of the fourth lens and an effective focal length f5 of the fifth lens satisfy: -1.0 < f4 / f5 < 0.

8. The optical lens of claim 1, wherein, a sum ∑AT of air spacings on the optical axis between adjacent lenses of the first lens to the sixth lens and a sum ∑CT of center thicknesses of the lenses of the first lens to the sixth lens satisfy: 0.7 < ∑AT / ∑CT < 0.

8.

9. The optical lens of claim 1, wherein, an air spacing AT56 on the optical axis between the fifth lens and the sixth lens and an interval EFL on the optical axis between the sixth lens and the imaging surface satisfy: 0.02 < AT56 / EFL < 0.

03.

10. The optical lens of claim 1, wherein, an effective focal length f6 of the sixth lens and an effective focal length f of the optical lens satisfy: -30 < f6 / f < -10.

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