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 positive refractive power, the object side of the first lens being a convex surface; a second lens with negative refractive power, the object side of the second lens being a convex surface and the image side of the second lens being a concave surface; a third lens with negative refractive power, the object side of the third lens being a concave surface and the image side of the third lens being a convex surface; a fourth lens with negative refractive power, the image side of the fourth lens being a concave surface; a fifth lens with positive refractive power, the image side of the fifth lens being a convex surface; and a sixth lens with positive refractive power, the object side of the sixth lens being a convex surface; wherein the total optical length TTL of the optical lens satisfies 20mm TTL 30mm. Through reasonable collocation of the lens shapes and refractive power combinations of the lenses, the application realizes the effects of high pixels, small distortion and miniaturization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, 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, and the pursuit of imaging effect is more diversified, which requires not only high image quality, but also a large field of view to shoot a wide range of visual impact strong picture, among which the unmanned aerial vehicle wins the favor of consumers with its unique high-altitude perspective and wide shooting picture. At present, the unmanned aerial vehicle develops rapidly, and the corresponding demand for optical lenses matched with it is also increasing.

[0003] Since the unmanned aerial vehicle is often used in complex environments such as severe vibration, high pressure and extreme temperature, the performance requirements of the optical lens matched with it are very high, which not only requires good thermal stability to adapt to the harsh outdoor environment, but also requires a light appearance and a 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 aperture to meet the needs of the unmanned aerial vehicle to shoot clear and vivid pictures in various environments such as day and night. However, the conventional optical lens on the market is difficult to meet the diversified use requirements of the unmanned aerial vehicle. SUMMARY

[0004] In view of the above technical 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 positive refractive power, whose object side is convex; a second lens with negative refractive power, whose object side is convex and image side is concave; a third lens with negative refractive power, whose object side is concave and image side is convex; a fourth lens with negative refractive power, whose image side is concave; a fifth lens with positive refractive power, whose image side is convex; a sixth lens with positive refractive power, whose object side is convex; wherein the total optical length TTL of the optical lens satisfies: 20mm < TTL < 30mm.

[0006] Compared with the prior art, the present application has the following advantages: the optical lens provided by the present application has reasonable refractive power distribution, surface type matching, lens thickness and lens spacing, so that the optical lens structure is compact, and can realize high pixel, small distortion and miniaturization effect. 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 imaging surface 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 do 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 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 commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should 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, in order from the object side to the imaging surface: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a filter.

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

[0028] In some embodiments, the first lens has positive focal power, and the object side surface is convex and the image side surface is concave, to collect as many large field of view light rays as possible and make the light rays enter the rear optical system, increasing the light throughput.

[0029] In some embodiments, the second lens has negative focal power, and the object side surface is convex and the image side surface is concave, to make the light rays collected by the first lens diverge and smoothly transition to the rear optical system.

[0030] In some embodiments, the third lens has negative focal power, and the object side surface is concave and the image side surface is convex, to adjust the light rays emitted by the second lens, reduce the aperture, and smoothly transition the light rays to the rear optical system.

[0031] In some embodiments, the fourth lens has negative focal power, and the object side surface is concave and the image side surface is concave, to diverge the light rays emitted by the third lens; the fifth lens has positive focal power, and the object side surface is convex and the image side surface is convex, to converge the light rays emitted by the fourth lens; and 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 more compact, which is conducive to the miniaturization of the optical lens.

[0032] In some embodiments, the sixth lens has positive focal power, and the object side surface is convex and the image side surface is convex near the optical axis, to converge the light rays and smoothly transition the light rays to the imaging surface.

[0033] In some embodiments, the diaphragm can be arranged between the third lens and the fourth lens, to reduce the range of light rays emitted from the front end of the optical lens, reduce the rear end aperture of the optical lens, and balance the structure and focal power distribution of the lens group in front of the diaphragm and the lens group behind the diaphragm.

[0034] In some embodiments, the total optical length TTL of the optical lens satisfies 20mm

[0035] In some embodiments, the effective focal length f of the optical lens and the image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.6 < f / IH < 2.0. Satisfying the above range, the optical lens has a longer focal length, realizing long-focus performance.

[0036] In some embodiments, the optical back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.55 < BFL / f < 0.75. Satisfying the above range, the optical lens has a larger optical back focal length, which is beneficial to the assembly of the optical lens.

[0037] In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 0.5 < f1 / f < 1.5. Satisfying the above range, the first lens has a suitable positive refractive power, which is beneficial to collecting as much light as possible in a large field of view and making the light enter the rear optical system, thereby increasing the light flux and illuminance.

[0038] In some embodiments, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f3 of the third lens satisfy: -7.0 < (f2+f3) / f1 < -2.0. Satisfying the above range, the second lens and the third lens have a suitable negative refractive power, which is beneficial to sufficiently dispersing the light collected by the first lens, so as to expand the field angle of the optical lens, and meanwhile, the light can smoothly transition to the rear optical system, so as to reduce the aberration and distortion of the optical lens and improve the imaging quality of the optical lens.

[0039] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 5.0 < f45 / f < 18.0. Satisfying the above range, the cemented lens has a suitable positive refractive power, which is beneficial to rapidly converging the light in front of the diaphragm, so as to reduce the optical path of the light, realize miniaturization of the optical lens, and meanwhile, reduce the difficulty of correcting aberration and improve the imaging quality of the optical lens.

[0040] In some embodiments, the effective focal length f3 of the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: -1.0 < f3 / f45 < 0. Satisfying the above range, the third lens has a suitable positive spherical aberration and the cemented lens has a suitable negative spherical aberration, and the focal length ratio of the lenses before and after the diaphragm is not large, which is beneficial to the smooth transition of the light and reduces the turning trend of the light, thereby improving the imaging quality of the optical lens.

[0041] In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.5 < f6 / f < 1.5. Satisfying the above range, the sixth lens has a suitable positive refractive power, which is beneficial to converging the light of the front optical system and smoothly reaching the imaging surface.

[0042] In some embodiments, the effective focal length f of the optical lens, the image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 1.0 < IH / (2xf tan(FOV / 2)) < 1.05. By reasonably setting the relationship between the effective focal length, the field of view angle, and the image height of the optical lens, the distortion of the optical lens can be constrained, and a small distortion characteristic can be achieved.

[0043] In some embodiments, the curvature radius R1 of the object side of the first lens satisfies: 0 < R1 / f < 1.0. By reasonably constraining the curvature radius of the object side of the first lens, as many large field of view rays as possible can be collected, and the turning trend of the incident light can be reasonably reduced, the field of view angle of the optical lens can be increased, and the correction difficulty of the aberration can be reduced, so as to achieve a balance between high pixels and large field of view.

[0044] In some embodiments, the effective focal length f2 of the second lens satisfies: -3.0 < f2 / f < -1.0; and the effective focal length f1 of the first lens satisfies: -1.5 < f1 / f2 < 0. By reasonably constraining the focal lengths of the first lens and the second lens, the light collected by the first lens can be smoothly transitioned to the second lens, and the light can be diverged by the second lens, which helps to reduce the aberration of the optical lens and improve the imaging quality of the optical lens.

[0045] In some embodiments, the combined focal length f45 of the fourth lens and the fifth lens satisfies: 5.0 < f45 / f6 < 18.0. By reasonably constraining the focal length relationship between the cemented lens and the sixth lens, the edge field of view light can be converged, the chromatic aberration and the distortion can be reduced, and high-definition imaging of the optical lens can be achieved.

[0046] In some embodiments, the effective half aperture DM6 of the image side of the third lens satisfies: 0.8 < DM6 / DM7 < 1.1. By reasonably constraining the relationship between the light passing aperture of the image side of the third lens in front of the diaphragm and the light passing aperture of the object side of the fourth lens behind the diaphragm, the light can be smoothly transitioned, and as many light rays as possible can enter the lens group behind the diaphragm, thereby increasing the light passing amount and the illumination of the optical lens.

[0047] In some embodiments, the fourth lens object side radius of curvature R7 and the fifth lens image side radius of curvature R9 satisfy: 0 < R7 / R9 < 1.0; the fourth lens center thickness CT4 and the fifth lens center thickness CT5 satisfy: 0.15 < CT4 / CT5 < 0.35. Satisfying the above ranges can reasonably constrain the surface shape of the fourth lens and the fifth lens in the cemented lens, help the incident light rays to be quickly converged after being diverged by the fourth lens and then by the fifth lens, so as to reduce the optical path of the light rays, realize the miniaturization of the optical lens, and at the same time help to improve the aberration and chromatic aberration of the optical lens, reduce the reflection loss of light energy, and improve the imaging quality of the optical lens, realizing the balance between high pixels and miniaturization.

[0048] In some embodiments, the second lens, the third lens, and the sixth lens are aspherical lenses, and the first lens, the fourth lens, and the fifth lens are spherical lenses. The use of aspherical lenses can effectively correct aberration, improve imaging quality, and provide higher cost-effective optical performance products; the use of spherical lenses can increase the reliability of the lens and ensure that the lens can be normally used in high and low temperature environments.

[0049] In order to make the system have better optical performance, a plurality of aspherical lenses are used in the optical lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:

[0050]

[0051] 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 fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order curved surface coefficients, respectively.

[0052] The application will be further described in the following embodiments. In each embodiment, the thickness, radius of curvature, and 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 preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement methods, and are included in the protection scope of the application.

[0053] Embodiment 1

[0054] Please refer to Figure 1 , which is a structure schematic diagram of an optical lens 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.

[0055] In the optical lens, the first lens L1 has positive refractive power, the object side S1 is a convex surface, and the image side S2 is a concave surface; the second lens L2 has negative refractive power, the object side S3 is a convex surface, and the image side S4 is a concave surface; the third lens L3 has negative refractive power, the object side S5 is a concave surface, and the image side S6 is a convex surface; the fourth lens L4 has negative refractive power, the object side S7 is a concave surface, and the image side is a concave surface; the fifth lens L5 has positive refractive power, the object side is a convex 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 positive refractive power, the object side S10 is a convex surface, and the image side S11 is a convex surface at the near optical axis; the filter G1 has a plane object side S12 and a plane image side S13.

[0056] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0057] Table 1-1

[0058]

[0059] The curve coefficients of the aspheric lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0060] Table 1-2

[0061] Face number K A B C S3 -1.35E+00 9.64E-04 1.52E-06 3.30E-07 S4 -5.80E-01 2.05E-03 1.95E-04 -1.56E-05 S5 3.81E+00 6.87E-03 1.15E-04 -1.59E-04 S6 9.94E+00 6.95E-03 -4.61E-04 5.06E-04 S10 -3.83E+00 9.12E-04 -6.33E-06 6.60E-07 S11 -1.05E+00 7.20E-04 7.90E-06 2.17E-06 Face number D E F G S3 7.35E-08 -7.99E-09 -1.79E-10 2.10E-11 S4 1.23E-05 -2.41E-06 2.93E-07 -2.18E-08 S5 7.00E-05 -1.52E-05 1.31E-06 -1.80E-08 S6 -2.87E-04 9.82E-05 -1.75E-05 1.32E-06 S10 -8.08E-08 6.66E-09 -2.97E-10 5.64E-12 S11 -3.20E-07 2.89E-08 -1.35E-09 2.60E-11

[0062] Figure 2 The optical distortion curve of 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 of view (unit: °). As can be seen from the figure, the optical distortion of the embodiment is controlled within-1.0%, which indicates that the distortion of the optical lens is well corrected.

[0063] Figure 3 The modulation transfer function (MTF) curve of 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. As can be seen from the figure, the MTF value of the embodiment is above 0.65 within the full field of view, and in the range of 0-100 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0064] Figure 4The axial chromatic aberration curve of the optical lens of embodiment 1 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.550 μm), the horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±0.75 μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0065] Embodiment 2

[0066] Referring to Figure 5 , which is a structural schematic diagram of the optical lens provided in embodiment 2 of the present application. The optical lens in this 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, central thickness, edge thickness and material of each lens are changed.

[0067] The related parameters of each lens in the optical lens in embodiment 2 are shown in Table 2-1.

[0068] Table 2-1

[0069]

[0070] The curve coefficients of the aspheric lenses of the optical lens in embodiment 2 are shown in Table 2-2.

[0071] Table 2-2

[0072]

[0073]

[0074] Figures 6 to 8 The optical distortion curve, the modulation transfer function (MTF) curve and the axial chromatic aberration curve of embodiment 2 are shown respectively. As can be seen from the figures, the optical distortion is controlled within -2.0%, which indicates that the distortion of the optical lens is well corrected; the MTF value of the optical lens is above 0.55 in the full field of view, and in the range of 0-100 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency; the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±0.20 μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0075] Embodiment 3

[0076] Referring to Figure 9Fig. 3 is a structural schematic diagram of an optical lens provided in Embodiment 3 of the present application, and the optical lens in this embodiment has substantially the same structure and shape as the optical lens in Embodiment 1, except that the radius of curvature, center thickness, edge thickness and material of each lens are changed.

[0077] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0078] Table 3-1

[0079]

[0080] The curve coefficients of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0081] Table 3-2

[0082] Face number K A B C S3 -1.42E+00 9.62E-04 1.39E-05 1.39E-06 S4 -6.68E-01 1.65E-03 1.86E-04 -1.76E-05 S5 3.66E+00 3.25E-03 2.50E-04 -1.18E-04 S6 2.08E+01 4.49E-03 -1.51E-04 4.70E-04 S10 -5.59E+00 9.64E-04 4.55E-06 9.89E-07 S11 2.28E+00 7.02E-04 1.12E-05 2.60E-06 Face number D E F G S3 -3.09E-07 4.67E-08 -3.22E-09 7.99E-11 S4 9.41E-06 -1.35E-06 1.44E-07 -6.35E-09 S5 5.07E-05 -1.15E-05 1.33E-06 -6.25E-08 S6 -2.78E-04 9.73E-05 -1.74E-05 1.31E-06 S10 -7.81E-08 5.12E-09 -1.54E-10 1.65E-12 S11 -2.54E-07 1.88E-08 -6.42E-10 9.24E-12

[0083] Figures 10 to 12 The optical distortion curve, the modulation transfer function (MTF) curve and the axial chromatic aberration curve of Embodiment 3 are shown respectively. As can be seen from the figures, the optical distortion is controlled within -2.0%, 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 in the range of 0-100 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and the optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency; the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±0.25 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge of the field of view and the secondary spectrum of the entire image plane.

[0084] Table 4 is the optical characteristics corresponding to the above three embodiments, including the effective focal length f, the maximum field of view FOV, the total optical length TTL, the aperture number FNO, the image height IH corresponding to the maximum field of view, and the numerical value corresponding to each conditional expression in each embodiment.

[0085] Table 4

[0086]

[0087]

[0088] In the description of the present specification, the description of 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0089] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, 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, comprising six lenses in order from an object side to an image plane along an optical axis as follows: a first lens with positive refractive power, an object side surface of the first lens being convex; a second lens with negative refractive power, an object side surface of the second lens being convex, an image side surface of the second lens being concave; a third lens with negative refractive power, an object side surface of the third lens being concave, an image side surface of the third lens being convex; a fourth lens with negative refractive power, an object side surface of the fourth lens being concave; a fifth lens with positive refractive power, an image side surface of the fifth lens being convex; a sixth lens with positive refractive power, an object side surface of the sixth lens being convex; wherein an overall optical length TTL of the optical lens satisfies: 20mm < TTL < 30mm; an overall optical length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.0; the effective focal length f of the optical lens, an image height IH corresponding to a maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 1.0 < IH / (2xfxtan(FOV / 2)) < 1.

05.

2. The optical lens of claim 1, wherein, An optical total track length TTL of the optical lens satisfies: 27.546mm ≤ TTL ≤ 28mm. An optical total track length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 1.723 ≤ TTL / f ≤ 1.

750.

3. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and an image height IH corresponding to a maximum field angle of view of the optical lens satisfy: 1.6 < f / IH < 2.

0.

4. The optical lens of claim 1, wherein, An optical back focal length BFL of the optical lens and an effective focal length f of the optical lens satisfy: 0.55 < BFL / f < 0.

75.

5. The optical lens of claim 1, wherein, An effective focal length f1 of the first lens and an effective focal length f of the optical lens satisfy: 0.5 < f1 / f < 1.

5.

6. The optical lens of claim 1, wherein, An effective focal length f1 of the first lens, an effective focal length f2 of the second lens, and an effective focal length f3 of the third lens satisfy: -7.0 < (f2+f3) / f1 < -2.

0.

7. The optical lens of claim 1, wherein, A combined focal length f45 of the fourth lens and the fifth lens and an effective focal length f of the optical lens satisfy: 5.0 < f45 / f < 18.

0.

8. The optical lens of claim 1, wherein, An effective focal length f3 of the third lens and a combined focal length f45 of the fourth lens and the fifth lens satisfy: -1.0 < f3 / f45 < 0.

9. 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: 0.5 < f6 / f < 1.

5.

10. The optical lens of claim 1, wherein, An effective focal length f of the optical lens, an image height IH corresponding to a maximum field angle of view of the optical lens, and a maximum field angle of view FOV of the optical lens satisfy: 1.026 ≤ IH / (2xfxtan(FOV / 2)) ≤ 1.039.

Images