Optical lens

Abstract

The present invention provides an optical lens, which has a total of seven lenses. Along the optical axis from the object side to the imaging surface, they are successively: a first lens with a negative optical power, whose object side surface is convex and image side surface is concave; a second lens with an optical power, whose object side surface is concave and image side surface is convex; a third lens with a negative optical power; a fourth lens with a positive optical power, both of whose object side surface and image side surface are convex; a diaphragm; a fifth lens with a negative optical power, both of whose object side surface and image side surface are concave; a sixth lens with a positive optical power, both of whose object side surface and image side surface are convex; a seventh lens with a positive optical power; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f| > 18. The optical lens provided by the present invention improves the resolution of the optical lens, reduces aberration, and improves the imaging quality of the optical lens through the reasonable configuration of each lens surface type and the reasonable combination of optical powers.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.

[0003] Advanced driver assistance systems (ADAS) play an important role in intelligent driving. They use various lenses and sensors to collect environmental information to ensure the driver's driving safety. The surround view lenses of existing ADAS systems require optical lenses to be thin and short, have high pixels, and high resolution. They also require optical lenses to be able to produce clear images under low illumination conditions. Therefore, it is necessary to develop an optical lens with good imaging effect. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0005] The present invention provides an optical lens, which has seven lenses in total, which are as follows from the object side to the imaging surface along the optical axis:

[0006] The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave;

[0007] a second lens having optical power, wherein the object side surface is concave and the image side surface is convex;

[0008] a third lens having negative optical power;

[0009] The fourth lens has positive refractive power, and both the object side surface and the image side surface are convex;

[0010] Aperture;

[0011] A fifth lens having negative optical power, wherein both the object side surface and the image side surface are concave;

[0012] The sixth lens has positive refractive power, and both the object side surface and the image side surface are convex;

[0013] a seventh lens having positive refractive power;

[0014] The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f|>18.

[0015] Further preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: 3.5 <TTL / f<8.5。

[0016] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.5<(IH / 2) / (f×tan(FOV / 2))<1.0.

[0017] Further preferably, the maximum field of view FOV and aperture value FNO of the optical lens satisfy: 25°<FOV / FNO<65°.

[0018] Further preferably, the real image height IH and entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 2.0 <IH / EPD<4.0。

[0019] Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.0 <IH / f<2.0。

[0020] Further preferably, the maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side of the first lens satisfy the following relationship: 0.9<D1 / IH / tan(FOV / 2)<2.8.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.0 <f1 / f<-1.8。

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 <f5 / f<-0.5。

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 4.0 <f7 / f<7.5。

[0024] The optical lens provided by the present invention improves the resolution of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through reasonable configuration of the surface shapes of each lens and reasonable matching of the optical focal length. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention. Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention. Figure 3 : is the F-Tanθ distortion curve of the optical lens in Example 1 of the present invention. Figure 4 This is the MTF curve diagram of the optical lens in Example 1 of the present invention. Figure 5Graph showing the axial aberration of the optical lens in Example 1 of the present invention. Figure 6 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0027] Figure 7 Schematic diagram of the structure of the optical lens in Example 2 of the present invention. Figure 8 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention. Fig. 9 : is the F-Tanθ distortion curve of the optical lens in Example 2 of the present invention. Fig.10 This is an MTF curve diagram of the optical lens in Example 2 of the present invention. Fig.11 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention. Fig.12 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0028] Fig.13 Schematic diagram of the structure of the optical lens in Example 3 of the present invention. Fig.14 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention. Fig.15 : is the F-Tanθ distortion curve of the optical lens in Example 3 of the present invention. Fig.16 This is the MTF curve diagram of the optical lens in Example 3 of the present invention. Fig.17 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention. Fig.18 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0029] Fig.19 Schematic diagram of the structure of the optical lens in Example 4 of the present invention. Fig. 20 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention. Fig.21 : is the F-Tanθ distortion curve of the optical lens in Example 4 of the present invention. Fig. 22 This is the MTF curve diagram of the optical lens in Example 4 of the present invention. Fig.23 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention. Fig.24 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0030] Fig.25 Schematic diagram of the structure of the optical lens in Example 5 of the present invention. Fig.26 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention. Fig. 27 : is the F-Tanθ distortion curve of the optical lens in Example 5 of the present invention. Fig.28 This is the MTF curve diagram of the optical lens in Example 5 of the present invention. Fig.29 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention. Fig.30 Graph showing the vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.

[0031] Fig.31 Schematic diagram of the structure of the optical lens in Example 6 of the present invention. Fig.32 4 is a field curvature curve diagram of the optical lens in Example 6 of the present invention. Fig.33 : is the F-Tanθ distortion curve of the optical lens in Example 6 of the present invention. Fig.34 This is the MTF curve diagram of the optical lens in Example 6 of the present invention. Fig.35 Graph showing the axial aberration of the optical lens in Embodiment 6 of the present invention. Fig.36 Graph showing the vertical axis chromatic aberration of the optical lens in Example 6 of the present invention.

[0032] Fig.37 Schematic diagram of the structure of the optical lens in Example 7 of the present invention. Fig.38 4 is a field curvature curve diagram of the optical lens in Example 7 of the present invention. Fig.39 : is the F-Tanθ distortion curve of the optical lens in Example 7 of the present invention. Fig.40 This is the MTF curve diagram of the optical lens in Example 7 of the present invention. Fig.41 Graph showing the axial aberration of the optical lens in Embodiment 7 of the present invention. Fig.42 Graph showing the vertical axis chromatic aberration of the optical lens in Example 7 of the present invention.

[0033] Fig.43 Schematic diagram of the structure of the optical lens in Example 8 of the present invention. Fig.44 4 is a field curvature curve diagram of the optical lens in Example 8 of the present invention. Fig.45 : is the F-Tanθ distortion curve of the optical lens in Example 8 of the present invention. Fig.46 This is the MTF curve diagram of the optical lens in Example 8 of the present invention. Fig.47 4 is an axial aberration curve diagram of the optical lens in Example 8 of the present invention. Fig.48 Graph showing the vertical axis chromatic aberration of the optical lens in Example 8 of the present invention.

[0034] Fig.49 Schematic diagram of the structure of the optical lens in Example 9 of the present invention. Fig.50 4 is a field curvature curve diagram of the optical lens in Example 9 of the present invention. Fig.51 : is the F-Tanθ distortion curve of the optical lens in Example 9 of the present invention. Fig.52 This is an MTF curve diagram of the optical lens in Example 9 of the present invention. Fig.53 Graph showing the axial aberration of the optical lens in Embodiment 9 of the present invention. Fig.54 Graph showing the vertical axis chromatic aberration of the optical lens in Example 9 of the present invention.

[0035] Fig.55 Schematic diagram of the structure of the optical lens in Example 10 of the present invention. Fig.56 It is a field curvature curve diagram of the optical lens in embodiment 10 of the present invention. Fig.57 : is the F-Tanθ distortion curve of the optical lens in Example 10 of the present invention. Fig.58 This is an MTF curve diagram of the optical lens in Example 10 of the present invention. Fig.59 Graph showing the axial aberration of the optical lens in Embodiment 10 of the present invention. Fig.60 Graph showing the vertical axis chromatic aberration of the optical lens in Example 10 of the present invention.

[0036] Fig.61 Schematic diagram of the structure of the optical lens in Example 11 of the present invention. Fig.62 4 is a field curvature curve diagram of the optical lens in Example 11 of the present invention. Fig.63 : is the F-Tanθ distortion curve of the optical lens in Example 11 of the present invention. Fig.64 This is the MTF curve diagram of the optical lens in Example 11 of the present invention. Fig.65 4 is an axial aberration curve diagram of the optical lens in Example 11 of the present invention. Fig.66 Graph showing the vertical axis chromatic aberration of the optical lens in Example 11 of the present invention.

[0037] Fig.67 Schematic diagram of the structure of the optical lens in Example 12 of the present invention. Fig.68 4 is a field curvature curve diagram of the optical lens in Example 12 of the present invention. Fig.69 : is the F-Tanθ distortion curve of the optical lens in Example 12 of the present invention. Fig.70 This is the MTF curve diagram of the optical lens in Example 12 of the present invention. Fig.71 4 is an axial aberration curve diagram of the optical lens in Example 12 of the present invention. Fig.72 Graph showing the vertical axis chromatic aberration of the optical lens in Example 12 of the present invention.

[0038] Fig.73 Schematic diagram of the structure of the optical lens in Example 13 of the present invention. Fig.74 Graph showing the field curvature of the optical lens in Embodiment 13 of the present invention. Fig.75 : is the F-Tanθ distortion curve of the optical lens in Example 13 of the present invention. Fig.76 This is the MTF curve diagram of the optical lens in Example 13 of the present invention. Fig.77 4 is an axial aberration curve diagram of the optical lens in Example 13 of the present invention. Fig.78 Graph showing the vertical axis chromatic aberration of the optical lens in Example 13 of the present invention.

[0039] Fig.79 Schematic diagram of the structure of the optical lens in Example 14 of the present invention. Fig.80 4 is a field curvature curve diagram of the optical lens in Example 14 of the present invention. Fig.81 : is the F-Tanθ distortion curve of the optical lens in Example 14 of the present invention. Fig.82 This is the MTF curve diagram of the optical lens in Example 14 of the present invention. Fig.83 4 is an axial aberration curve diagram of the optical lens in Example 14 of the present invention. Fig.84 Graph showing the vertical axis chromatic aberration of the optical lens in Example 14 of the present invention.

[0040] Fig.85 Schematic diagram of the structure of the optical lens in Example 15 of the present invention. Fig.86 4 is a field curvature curve diagram of the optical lens in Example 15 of the present invention. Fig.87 : is the F-Tanθ distortion curve of the optical lens in Example 15 of the present invention. Fig.88 This is the MTF curve diagram of the optical lens in Example 15 of the present invention. Fig.89 4 is an axial aberration curve diagram of the optical lens in Example 15 of the present invention. Fig.90 Graph showing the vertical axis chromatic aberration of the optical lens in Example 15 of the present invention.

[0041] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0044] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0046] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, 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 listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0047] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] The optical lens according to the embodiment of the present invention includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, a filter and a protective glass.

[0050] In some embodiments, the first lens may have a negative optical power, which is beneficial to reduce the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. Its object side surface is convex and the image side surface is concave, which is beneficial to collect the edge field of view light as much as possible to enter the rear optical lens, and realize large-angle light collection.

[0051] In some embodiments, the second lens may have a positive optical power. Its object side is concave and its image side is convex, which is beneficial to balancing the off-axis aberration caused by the first lens and improving the imaging quality of the optical lens. The second lens may also have a negative optical power. Its object side is concave and its image side is convex, which can share the negative optical power at the front end of the lens, thereby facilitating reducing the excessive light deflection caused by the over-concentration of the optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.

[0052] In some embodiments, the third lens may have a negative optical power, which is beneficial to reducing the light deflection angle, enabling the light to transition smoothly, and is beneficial to balancing the spherical aberration caused by the front-end lens and improving the imaging quality of the optical lens.

[0053] In some embodiments, the fourth lens may have a positive optical power, which is beneficial to improving the light converging ability of the optical lens. Its object side and image side are both convex, which is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0054] In some embodiments, the fifth lens may have a negative optical power, which is beneficial to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. Its object side and image side are both concave, which can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0055] In some embodiments, the sixth lens may have a positive optical power, which is beneficial to improving the light converging ability of the optical lens. Its object side and image side are both convex, which is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.

[0056] In some embodiments, the seventh lens may have a positive optical power, which is beneficial to suppressing the angle of the marginal field incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f| > 18. Meeting the above requirements, the second lens adopts a larger focal length, which can reduce the angle of incidence light deflection while sharing the deflection of the incident light by the front-end lens.

[0058] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 3.5 < TTL / f < 8.5. Meeting the above requirements ensures sufficient space to adjust the lens structure and optimize the imaging effect.

[0059] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view satisfy: 0.5 < (IH / 2) / (f×tan(FOV / 2)) < 1.0. Meeting the above requirements indicates that the optical distortion of the optical lens is well controlled, improving the resolution of the optical lens.

[0060] In some embodiments, the maximum field of view FOV of the optical lens and the f-number FNO satisfy: 25° < FOV / FNO < 65°. Meeting the above range is beneficial to expanding the field of view of the optical lens and increasing the aperture of the optical lens, facilitating the optical lens to obtain more scene information to meet the requirements of large-range detection. The realization of the large-aperture characteristic is beneficial to improving the problem of rapid decline in relative brightness in the edge field of view, thereby also facilitating the acquisition of more scene information.

[0061] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD satisfy: 2.0 < IH / EPD < 4.0. Meeting the above range can increase the width of the light beam incident on the optical lens, improving the brightness at the image plane of the optical lens and avoiding vignetting.

[0062] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 1.0 < IH / f < 2.0. Meeting the above range can achieve the large image plane characteristic, improving the imaging quality of the optical lens.

[0063] In some embodiments, the maximum field of view FOV of the optical lens, the true image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side surface of the first lens satisfy: 0.9 < D1 / IH / tan(FOV / 2) < 2.8. Meeting the above range can ensure the balance between the size of the optical lens, the large field of view, and the large image plane.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.0 < f1 / f < -1.8. Meeting the above requirements can endow the first lens with an appropriate negative optical power, facilitating the reduction of the inclination angle of the incident light, thereby reducing the correction difficulty of various aberrations of the optical lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -8.0 < f3 / f < -2.0. Meeting the above requirements can endow the third lens with an appropriate negative optical power, sharing the negative optical power at the front end of the optical lens, thereby facilitating the avoidance of excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.5 < f4 / f < 2.0. Meeting the above requirements can endow the fourth lens with an appropriate positive optical power, reduce the light deflection angle while converging the light, enable the light to transition smoothly, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 < f5 / f < -0.5. Meeting the above requirements can endow the fifth lens with an appropriate negative optical power, increase the imaging area of the optical lens; at the same time, it can optimize the chromatic aberration of the optical lens and improve the imaging quality of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0.5 < f6 / f < 1.8. Meeting the above requirements can endow the sixth lens with an appropriate positive optical power, reduce the light deflection angle while converging the light, enable the light to transition smoothly, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 4.0 < f7 / f < 7.5. Meeting the above requirements can endow the seventh lens with an appropriate positive optical power, which is beneficial to suppressing the angle of the marginal field of view incident on the imaging surface, effectively transmitting more light beams to the imaging surface, and improving the imaging quality of the optical lens; at the same time, it also optimizes the spherical aberration of the optical lens and improves the imaging quality of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the combined focal length f of the first lens to the fourth lens 14 satisfy: 0.7 < f 14 / f < 1.2. Meeting the above requirements, by reasonably distributing the optical power of the first lens to the fourth lens, it is beneficial to reduce the front aperture of the lens and improve the correction ability of various aberrations at the front end of the optical lens.

[0071] In some embodiments, the effective focal length f of the optical lens and the combined focal length f of the fifth lens to the seventh lens 57 satisfy: 5.0 < f 57 / f < 88.0. Meeting the above requirements, by reasonably distributing the optical power of the fifth lens to the seventh lens, balancing the focal length of the optical lens is beneficial to the smooth light trend and compressing the CRA of the marginal field of view outgoing light.

[0072] In some embodiments, the Abbe number Vd of at least one of the fifth lens and the sixth lens satisfies: Vd>80, and the Abbe number Vd5 of the fifth lens and the Abbe number Vd6 of the sixth lens satisfy: Vd6-Vd5>60. Meeting the above range is conducive to achieving confocality of visible light and infrared light.

[0073] In some embodiments, the fifth lens and the sixth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing technology of the optical lens and improving the assembly yield of the optical lens.

[0074] In some embodiments, the second lens, the fourth lens and the seventh lens may all adopt the surface shape of an aspherical lens to improve the resolution quality.

[0075] In order to make the system have better optical performance, multiple aspherical lenses are used in the lens, and the shape of each aspherical surface of the optical lens satisfies the following equation:

[0076]

[0077] Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0078] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0079] Example 1

[0080] See also Figure 1 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0081] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0082] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0083] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0084] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0085] Aperture ST;

[0086] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0087] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0088] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0089] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0090] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0091] The object side surface S16 and the image side surface S17 of the protective glass G2 are both planes;

[0092] The imaging surface S18 is a plane.

[0093] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0094] Table 1-1

[0095]

[0096] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0097] Table 1-2

[0098] Face number K A B C D E F S3 -1.09E+00 0.00E+00 5.32E-04 -1.85E-07 1.48E-07 -1.30E-08 5.40E-10 S4 -2.30E+00 0.00E+00 -8.30E-05 9.31E-06 3.08E-08 -5.51E-09 3.38E-10 S7 -8.21E-01 0.00E+00 2.28E-04 5.83E-06 1.10E-07 8.93E-09 9.40E-11 S8 -1.93E+01 0.00E+00 1.78E-04 3.40E-05 1.48E-07 -6.72E-08 7.99E-09 S12 -6.45E+00 0.00E+00 -3.34E-04 2.29E-05 3.06E-06 -3.61E-08 1.56E-09 S13 4.47E+01 0.00E+00 -6.88E-04 2.29E-05 8.25E-07 1.45E-08 3.52E-09

[0099] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 shown.

[0100] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.03mm to 0.06mm, indicating that the optical lens can correct the field curvature well.

[0101] Figure 3 The F-Tanθ distortion curve of Example 1 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -22% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0102] Figure 4 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0103] Figure 5 The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 15μm, indicating that the optical lens can correct the axial aberration well.

[0104] Figure 6 The vertical chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 6 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0105] Example 2

[0106] See also Figure 7, which is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0107] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0108] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0109] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0110] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0111] Aperture ST;

[0112] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0113] The sixth lens L6 has negative refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0114] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0115] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0116] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0117] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0118] The imaging surface S18 is a plane.

[0119] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0120] Table 2-1

[0121]

[0122]

[0123] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

[0124] Table 2-2

[0125] Face number K A B C D E F S3 -1.41E+00 0.00E+00 5.15E-04 4.62E-07 1.43E-07 -1.49E-08 4.05E-10 S4 -2.51E+00 0.00E+00 -2.78E-05 1.11E-05 1.98E-08 -6.05E-09 2.21E-10 S7 -8.95E-01 0.00E+00 2.06E-04 5.32E-06 1.51E-07 1.10E-08 -1.77E-11 S8 -1.67E+01 0.00E+00 1.37E-04 3.57E-05 2.46E-07 -5.51E-08 5.88E-09 S12 -2.95E+00 0.00E+00 -2.73E-04 1.42E-05 4.31E-06 -4.90E-08 2.08E-09 S13 -6.02E+00 0.00E+00 -7.03E-04 2.62E-05 8.32E-07 2.50E-08 6.02E-09

[0126] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 shown.

[0127] Figure 8 The field curvature curve of Example 2 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.05mm to 0.08mm, indicating that the optical lens can well correct the field curvature.

[0128] Fig. 9 The F-Tanθ distortion curve of Example 2 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -22% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0129] Fig.10 The MTF (Modulation Transfer Function) curve of Example 2 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0130] Fig.11 The axial aberration curve of Example 2 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 15μm, indicating that the optical lens can correct the axial aberration well.

[0131] Fig.12The vertical chromatic aberration curve of Example 2 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 7 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0132] Example 3

[0133] See also Fig.13 , which is a schematic diagram of the structure of the optical lens provided in Example 3 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0134] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0135] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0136] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0137] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0138] Aperture ST;

[0139] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0140] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0141] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0142] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0143] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0144] The object side surface S16 and the image side surface S17 of the protective glass G2 are both planes;

[0145] The imaging surface S18 is a plane.

[0146] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0147] Table 3-1

[0148]

[0149]

[0150] The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0151] Table 3-2

[0152] Face number K A B C D E F S3 -1.81E+00 0.00E+00 7.18E-04 -1.88E-05 5.76E-07 -4.35E-09 3.79E-10 S4 -2.09E+00 0.00E+00 -6.22E-05 1.11E-05 -1.01E-07 -7.19E-09 4.42E-10 S7 -1.08E+00 0.00E+00 9.72E-05 1.01E-05 1.78E-07 -5.80E-09 6.60E-10 S8 -2.60E+00 0.00E+00 -2.12E-05 4.38E-05 2.87E-07 -1.35E-07 9.89E-09 S12 -1.17E+00 0.00E+00 -3.25E-04 8.51E-06 2.04E-06 -3.75E-08 5.30E-10 S13 4.75E+00 0.00E+00 -3.66E-04 1.41E-05 2.22E-06 -7.69E-08 4.98E-09

[0153] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.14 , Fig.15 , Fig.16 , Fig.17 , Fig.18 shown.

[0154] Fig.14 The field curvature curve of Example 3 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.03mm, indicating that the optical lens can correct the field curvature well.

[0155] Fig.15 The F-Tanθ distortion curve of Example 3 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -7% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0156] Fig.16 The MTF (Modulation Transfer Function) curve of Example 3 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0157] Fig.17 The axial aberration curve of Example 3 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±25μm, indicating that the optical lens can correct the axial aberration well.

[0158] Fig.18 The vertical chromatic aberration curve of Example 3 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0 to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0159] Example 4

[0160] See also Fig.19 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 4 of the present invention, wherein the optical lens comprises, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0161] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0162] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0163] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0164] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0165] Aperture ST;

[0166] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0167] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0168] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0169] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0170] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0171] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0172] The imaging surface S18 is a plane.

[0173] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0174] Table 4-1

[0175]

[0176] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0177] Table 4-2

[0178]

[0179]

[0180] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig. 20 , Fig.21 , Fig. 22 , Fig.23 , Fig.24 shown.

[0181] Fig. 20 The field curvature curve of Example 4 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can correct the field curvature well.

[0182] Fig.21 The F-Tanθ distortion curve of Example 4 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -6% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0183] Fig. 22The MTF (Modulation Transfer Function) curve of Example 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0184] Fig.23 The axial aberration curve of Example 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -20μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0185] Fig.24 The vertical chromatic aberration curve of Example 4 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0186] Example 5

[0187] See also Fig.25 , which is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0188] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0189] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0190] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0191] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0192] Aperture ST;

[0193] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0194] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0195] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0196] The seventh lens L7 has positive refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0197] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0198] The object side surface S16 and the image side surface S17 of the protective glass G2 are both planes;

[0199] The imaging surface S18 is a plane.

[0200] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0201] Table 5-1

[0202]

[0203]

[0204] The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0205] Table 5-2

[0206] Face number K A B C D E F S3 -1.43E+00 0.00E+00 2.46E-04 -2.55E-05 2.18E-06 -5.33E-08 2.13E-10 S4 -1.68E+00 0.00E+00 -2.20E-04 1.12E-05 -5.40E-09 1.49E-09 -4.47E-11 S7 -1.16E+00 0.00E+00 1.08E-04 1.27E-05 2.56E-07 -1.36E-08 7.11E-10 S8 -6.54E+00 0.00E+00 5.20E-05 4.14E-05 3.95E-07 -9.68E-08 7.34E-09 S12 9.07E+00 0.00E+00 -1.08E-03 7.03E-06 -1.07E-07 7.98E-08 -1.05E-09 S13 2.71E+00 0.00E+00 -7.18E-04 8.00E-06 -3.05E-07 3.63E-08 -5.70E-10

[0207] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.26 , Fig. 27 , Fig.28 , Fig.29 , Fig.30 shown.

[0208] Fig.26 The field curvature curve of Example 5 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.03mm, indicating that the optical lens can correct the field curvature well.

[0209] Fig. 27 The F-Tanθ distortion curve of Example 5 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -11% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0210] Fig.28 The MTF (Modulation Transfer Function) curve of Example 5 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0211] Fig.29 The axial aberration curve of Example 5 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0212] Fig.30 The vertical chromatic aberration curve of Example 5 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm to 4 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0213] Example 6

[0214] See also Fig.31 , which is a schematic diagram of the structure of the optical lens provided in Example 6 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0215] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0216] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0217] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0218] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0219] Aperture ST;

[0220] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0221] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0222] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0223] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0224] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0225] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0226] The imaging surface S18 is a plane.

[0227] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0228] Table 6-1

[0229]

[0230]

[0231] The surface parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.

[0232] Table 6-2

[0233] Face number K A B C D E F S3 -8.08E-01 0.00E+00 1.76E-04 2.14E-06 4.90E-07 4.22E-09 -1.73E-10 S4 -2.15E+00 0.00E+00 -1.69E-04 6.36E-06 2.67E-07 -3.24E-09 2.21E-10 S7 -8.72E-01 0.00E+00 2.38E-04 2.85E-06 1.70E-07 8.38E-09 3.07E-11 S8 -2.11E+01 0.00E+00 1.95E-04 2.87E-05 -2.43E-07 -2.16E-08 7.42E-09 S12 4.04E+00 0.00E+00 -3.57E-04 1.18E-05 2.02E-06 -9.78E-08 8.82E-09 S13 -6.59E+00 0.00E+00 -7.82E-04 4.42E-06 -1.08E-06 5.00E-08 4.22E-09

[0234] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.32 , Fig.33 , Fig.34 , Fig.35 , Fig.36 shown.

[0235] Fig.32 The field curvature curve of Example 6 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can correct the field curvature well.

[0236] Fig.33 The F-Tanθ distortion curve of Example 6 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -45% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0237] Fig.34 The MTF (Modulation Transfer Function) curve of Example 6 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0238] Fig.35 The axial aberration curve of Example 6 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 20μm, indicating that the optical lens can correct the axial aberration well.

[0239] Fig.36 The vertical chromatic aberration curve of Example 6 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3 μm to 7 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0240] Example 7

[0241] See also Fig.37, which is a schematic diagram of the structure of an optical lens provided in Example 7 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0242] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0243] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0244] The third lens L3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0245] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0246] Aperture ST;

[0247] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0248] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0249] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0250] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0251] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0252] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0253] The imaging surface S18 is a plane.

[0254] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0255] Table 7-1

[0256]

[0257] The surface parameters of the aspherical lens of the optical lens in Example 7 are shown in Table 7-2.

[0258] Table 7-2

[0259] Face number K A B C D E F S3 -9.55E-01 0.00E+00 3.48E-04 -3.43E-06 1.38E-07 -1.57E-09 1.80E-10 S4 -2.38E+00 0.00E+00 -1.82E-04 2.48E-06 1.81E-07 -5.35E-09 1.54E-10 S7 -7.99E-01 0.00E+00 2.66E-04 -4.16E-06 2.18E-07 1.01E-08 -1.00E-10 S8 -1.66E+01 0.00E+00 1.01E-04 1.56E-05 -3.41E-07 6.95E-08 -1.50E-09 S12 -1.89E+00 0.00E+00 -5.46E-04 -1.17E-05 8.51E-07 -7.24E-08 3.59E-09 S13 3.94E+01 0.00E+00 -8.55E-04 -1.24E-06 -8.31E-07 -1.63E-08 4.40E-09

[0260] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.38 , Fig.39 , Fig.40 , Fig.41 , Fig.42 shown.

[0261] Fig.38 The field curvature curve of Example 7 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can correct the field curvature well.

[0262] Fig.39 The F-Tanθ distortion curve of Example 7 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -45% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0263] Fig.40 The MTF (Modulation Transfer Function) curve of Example 7 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0264] Fig.41 The axial aberration curve of Example 7 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 15μm, indicating that the optical lens can correct the axial aberration well.

[0265] Fig.42The vertical chromatic aberration curve of Example 7 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0266] Example 8

[0267] See also Fig.43 , which is a schematic diagram of the structure of the optical lens provided in Example 8 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0268] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0269] The second lens L2 has negative refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0270] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0271] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0272] Aperture ST;

[0273] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0274] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0275] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0276] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0277] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0278] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0279] The imaging surface S18 is a plane.

[0280] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0281] Table 8-1

[0282]

[0283]

[0284] The surface parameters of the aspherical lens of the optical lens in Example 8 are shown in Table 8-2.

[0285] Table 8-2

[0286] Face number K A B C D E F S3 -8.08E-01 0.00E+00 1.75E-04 3.12E-06 4.43E-07 3.37E-09 -1.47E-10 S4 -2.09E+00 0.00E+00 -1.69E-04 7.35E-06 2.66E-07 -4.48E-09 2.75E-10 S7 -9.44E-01 0.00E+00 2.15E-04 2.70E-06 1.30E-07 6.36E-09 -5.13E-11 S8 -2.18E+01 0.00E+00 1.67E-04 1.92E-05 -3.36E-07 5.01E-08 -6.38E-10 S12 5.24E+00 0.00E+00 -3.39E-04 6.25E-06 1.84E-06 -4.47E-08 7.14E-09 S13 -1.74E+01 0.00E+00 -7.40E-04 8.77E-07 -8.04E-07 3.90E-08 6.00E-09

[0287] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.44 , Fig.45 , Fig.46 , Fig.47 , Fig.48 shown.

[0288] Fig.44 The field curvature curve of Example 8 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can well correct the field curvature.

[0289] Fig.45 The F-Tanθ distortion curve of Example 8 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -45% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0290] Fig.46 The MTF (Modulation Transfer Function) curve of Example 8 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0291] Fig.47 The axial aberration curve of Example 8 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 16μm, indicating that the optical lens can correct the axial aberration well.

[0292] Fig.48 The vertical chromatic aberration curve of Example 8 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -3 μm to 7 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0293] Example 9

[0294] See also Fig.49 , which is a schematic diagram of the structure of an optical lens provided in Example 9 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0295] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0296] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0297] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0298] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0299] Aperture ST;

[0300] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0301] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0302] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0303] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0304] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0305] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0306] The imaging surface S18 is a plane.

[0307] The relevant parameters of each lens in the optical lens in Example 9 are shown in Table 9-1.

[0308] Table 9-1

[0309]

[0310]

[0311] The surface parameters of the aspherical lens of the optical lens in Example 9 are shown in Table 9-2.

[0312] Table 9-2

[0313] Face number K A B C D E F S3 -9.64E-01 0.00E+00 4.50E-04 6.07E-06 8.95E-08 -1.27E-08 6.22E-10 S4 -2.00E+00 0.00E+00 -1.23E-04 1.06E-05 4.46E-08 -8.65E-09 4.44E-10 S7 -8.76E-01 0.00E+00 2.05E-04 8.42E-06 4.67E-08 6.27E-09 2.57E-10 S8 -1.83E+01 0.00E+00 1.58E-04 3.25E-05 3.15E-07 -8.68E-08 9.24E-09 S12 3.33E+00 0.00E+00 -2.05E-04 3.20E-05 3.10E-06 -1.18E-08 -5.59E-10 S13 -4.50E+01 0.00E+00 -4.51E-04 3.34E-05 1.47E-06 -3.90E-08 8.40E-09

[0314] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.50 , Fig.51 , Fig.52 , Fig.53 , Fig.54 shown.

[0315] Fig.50 The field curvature curve of Example 9 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, indicating that the optical lens can well correct the field curvature.

[0316] Fig.51 The F-Tanθ distortion curve of Example 9 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -22% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0317] Fig.52The MTF (Modulation Transfer Function) curve of Example 9 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0318] Fig.53 The axial aberration curve of Example 9 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 16μm, indicating that the optical lens can correct the axial aberration well.

[0319] Fig.54 The vertical chromatic aberration curve of Example 9 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0320] Example 10

[0321] See also Fig.55 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 10 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0322] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0323] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0324] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0325] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0326] Aperture ST;

[0327] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0328] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0329] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0330] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0331] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0332] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0333] The imaging surface S18 is a plane.

[0334] The relevant parameters of each lens in the optical lens in Example 10 are shown in Table 10-1.

[0335] Table 10-1

[0336]

[0337] The surface parameters of the aspherical lens of the optical lens in Example 10 are shown in Table 10-2.

[0338] Table 10-2

[0339] Face number K A B C D E F S3 -1.34E+00 0.00E+00 4.80E-04 4.32E-07 1.50E-07 -1.45E-08 4.64E-10 S4 -2.41E+00 0.00E+00 -4.40E-05 1.09E-05 1.46E-08 -5.71E-09 2.76E-10 S7 -8.84E-01 0.00E+00 2.11E-04 5.91E-06 1.23E-07 8.67E-09 1.16E-10 S8 -1.61E+01 0.00E+00 1.28E-04 3.61E-05 2.91E-07 -5.89E-08 5.85E-09 S12 -6.38E+00 0.00E+00 -2.83E-04 1.40E-05 4.07E-06 -5.05E-08 2.35E-09 S13 -4.50E+01 0.00E+00 -6.74E-04 2.18E-05 1.04E-06 2.91E-08 4.80E-09

[0340] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.56 , Fig.57 , Fig.58 , Fig.59 , Fig.60 shown.

[0341] Fig.56 The field curvature curve of Example 10 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.06mm, indicating that the optical lens can correct the field curvature well.

[0342] Fig.57The F-Tanθ distortion curve of Example 10 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -22% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0343] Fig.58 The MTF (Modulation Transfer Function) curve of Example 10 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0344] Fig.59 The axial aberration curve of Example 10 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 16μm, indicating that the optical lens can correct the axial aberration well.

[0345] Fig.60 The vertical chromatic aberration curve of Example 10 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 7 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0346] Embodiment 11

[0347] See also Fig.61 , which is a schematic diagram of the structure of the optical lens provided in Example 11 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0348] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0349] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0350] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0351] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0352] Aperture ST;

[0353] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0354] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0355] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0356] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0357] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0358] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0359] The imaging surface S18 is a plane.

[0360] The relevant parameters of each lens in the optical lens in Example 11 are shown in Table 11-1.

[0361] Table 11-1

[0362]

[0363] The surface parameters of the aspherical lens of the optical lens in Example 11 are shown in Table 11-2.

[0364] Table 11-2

[0365]

[0366]

[0367] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.62 , Fig.63 , Fig.64 , Fig.65 , Fig.66 shown.

[0368] Fig.62 The field curvature curve of Example 11 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.02mm, indicating that the optical lens can correct the field curvature well.

[0369] Fig.63 The F-Tanθ distortion curve of Example 11 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -11% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0370] Fig.64 The MTF (Modulation Transfer Function) curve of Example 11 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0371] Fig.65 The axial aberration curve of Example 11 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -20μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0372] Fig.66 The vertical chromatic aberration curve of Example 11 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1 μm to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0373] Example 12

[0374] See also Fig.67, which is a schematic diagram of the structure of the optical lens provided in Example 12 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0375] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0376] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0377] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both concave;

[0378] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0379] Aperture ST;

[0380] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0381] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0382] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0383] The seventh lens L7 has positive refractive power, its object-side surface S12 is convex, and its image-side surface S13 is concave;

[0384] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0385] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0386] The imaging surface S18 is a plane.

[0387] The relevant parameters of each lens in the optical lens in Example 12 are shown in Table 12-1.

[0388] Table 12-1

[0389]

[0390]

[0391] The surface parameters of the aspherical lens of the optical lens in Example 12 are shown in Table 12-2.

[0392] Table 12-2

[0393] Face number K A B C D E F S3 -1.82E+00 0.00E+00 6.06E-04 -1.92E-05 9.95E-07 -1.94E-08 7.98E-10 S4 -2.06E+00 0.00E+00 -1.09E-04 1.11E-05 -3.54E-08 -8.76E-09 5.80E-10 S7 -1.14E+00 0.00E+00 7.29E-05 1.24E-05 2.70E-07 -1.37E-08 1.27E-09 S8 1.74E+00 0.00E+00 -3.53E-05 5.41E-05 -4.27E-07 -1.09E-07 1.28E-08 S12 5.99E-01 0.00E+00 -2.68E-04 8.96E-06 1.74E-06 -7.30E-08 1.73E-09 S13 1.15E+01 0.00E+00 -2.94E-04 -2.63E-07 2.65E-06 -1.13E-07 2.24E-09

[0394] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.68 , Fig.69 , Fig.70 , Fig.71 , Fig.72 shown.

[0395] Fig.68 The field curvature curve of Example 12 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can correct the field curvature well.

[0396] Fig.69 The F-Tanθ distortion curve of Example 12 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -5% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0397] Fig.70 The MTF (Modulation Transfer Function) curve of Example 12 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0398] Fig.71 The axial aberration curve of Example 12 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -15μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0399] Fig.72The vertical chromatic aberration curve of Example 12 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0400] Embodiment 13

[0401] See also Fig.73 , which is a schematic diagram of the structure of the optical lens provided in Example 13 of the present invention, wherein the optical lens includes, from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0402] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0403] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0404] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0405] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0406] Aperture ST;

[0407] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0408] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0409] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0410] The seventh lens L7 has positive refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;

[0411] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0412] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0413] The imaging surface S18 is a plane.

[0414] The relevant parameters of each lens in the optical lens in Example 13 are shown in Table 13-1.

[0415] Table 13-1

[0416]

[0417]

[0418] The surface parameters of the aspherical lens of the optical lens in Example 13 are shown in Table 13-2.

[0419] Table 13-2

[0420] Face number K A B C D E F S3 -1.41E+00 0.00E+00 2.27E-04 -2.52E-05 2.37E-06 -6.12E-08 3.43E-10 S4 -1.64E+00 0.00E+00 -2.36E-04 1.12E-05 3.44E-08 2.14E-09 -6.40E-11 S7 -1.15E+00 0.00E+00 1.12E-04 1.32E-05 2.64E-07 -1.39E-08 7.51E-10 S8 -4.84E+00 0.00E+00 2.30E-05 4.11E-05 4.80E-07 -9.30E-08 6.99E-09 S12 9.67E+00 0.00E+00 -1.15E-03 7.54E-06 9.29E-08 7.80E-08 -9.85E-10 S13 2.79E+00 0.00E+00 -7.53E-04 8.84E-06 -1.91E-07 2.95E-08 -5.53E-10

[0421] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.74 , Fig.75 , Fig.76 , Fig.77 , Fig.78 shown.

[0422] Fig.74 The field curvature curve of Example 13 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset (unit: mm), and the vertical axis indicates the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04mm, indicating that the optical lens can well correct the field curvature.

[0423] Fig.75 The F-Tanθ distortion curve of Example 13 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0424] Fig.76 The MTF (Modulation Transfer Function) curve of Example 13 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0425] Fig.77 The axial aberration curve of Example 13 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -15μm to 25μm, indicating that the optical lens can correct the axial aberration well.

[0426] Fig.78 The vertical chromatic aberration curve of Example 13 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within 0 to 4 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0427] Embodiment 14

[0428] See also Fig.79 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 14 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0429] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0430] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0431] The third lens L3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0432] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0433] Aperture ST;

[0434] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0435] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0436] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0437] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0438] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0439] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0440] The imaging surface S18 is a plane.

[0441] The relevant parameters of each lens in the optical lens in Example 14 are shown in Table 14-1.

[0442] Table 14-1

[0443]

[0444] The surface parameters of the aspherical lens of the optical lens in Example 14 are shown in Table 14-2.

[0445] Table 14-2

[0446] Face number K A B C D E F S3 -8.41E-01 0.00E+00 2.69E-04 -2.98E-06 6.64E-08 -5.81E-09 3.79E-10 S4 -2.34E+00 0.00E+00 -2.14E-04 1.28E-06 1.42E-07 -5.51E-09 1.56E-10 S7 -7.84E-01 0.00E+00 2.91E-04 -4.35E-06 2.11E-07 1.07E-08 -1.00E-10 S8 -1.75E+01 0.00E+00 1.03E-04 1.44E-05 -2.25E-07 8.13E-08 -2.85E-09 S12 -7.94E-01 0.00E+00 -4.85E-04 -7.00E-06 6.22E-07 -4.57E-08 4.41E-09 S13 2.95E+01 0.00E+00 -7.42E-04 -8.92E-06 -3.28E-07 -7.38E-09 2.95E-09

[0447] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.80 , Fig.81 , Fig.82 , Fig.83 , Fig.84 shown.

[0448] Fig.80 The field curvature curve of Example 14 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can well correct the field curvature.

[0449] Fig.81 The F-Tanθ distortion curve of Example 14 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -45% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0450] Fig.82The MTF (Modulation Transfer Function) curve of Example 14 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0451] Fig.83 The axial aberration curve of Example 14 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 16μm, indicating that the optical lens can correct the axial aberration well.

[0452] Fig.84 The vertical chromatic aberration curve of Example 14 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 6 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0453] Embodiment 15

[0454] See also Fig.85 , which is a schematic diagram of the structure of the optical lens provided in Example 15 of the present invention, wherein the optical lens includes, from the object side to the imaging surface along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0455] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0456] The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

[0457] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0458] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both convex surfaces;

[0459] Aperture ST;

[0460] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both concave surfaces;

[0461] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;

[0462] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;

[0463] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;

[0464] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;

[0465] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;

[0466] The imaging surface S18 is a plane.

[0467] The relevant parameters of each lens in the optical lens in Example 15 are shown in Table 15-1.

[0468] Table 15-1

[0469]

[0470]

[0471] The surface parameters of the aspherical lens of the optical lens in Example 15 are shown in Table 15-2.

[0472] Table 15-2

[0473] Face number K A B C D E F S3 -7.45E-01 0.00E+00 1.30E-04 3.24E-06 4.09E-07 2.87E-09 -4.58E-11 S4 -2.00E+00 0.00E+00 -1.92E-04 6.43E-06 2.46E-07 -4.86E-09 2.84E-10 S7 -9.34E-01 0.00E+00 2.22E-04 2.75E-06 1.20E-07 6.54E-09 -5.83E-11 S8 -2.16E+01 0.00E+00 1.61E-04 1.86E-05 -2.50E-07 6.49E-08 -2.51E-09 S12 4.62E+00 0.00E+00 -3.57E-04 3.86E-06 1.84E-06 -1.47E-08 6.59E-09 S13 -1.65E+01 0.00E+00 -7.60E-04 -3.95E-06 -5.53E-07 3.74E-08 5.82E-09

[0474] In this embodiment, the field curvature curve, F-Tanθ distortion curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are shown as follows: Fig.86 , Fig.87 , Fig.88 , Fig.89 , Fig.90 shown.

[0475] Fig.86 The field curvature curve of Example 15 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04 mm, indicating that the optical lens can well correct the field curvature.

[0476] Fig.87The F-Tanθ distortion curve of Example 15 is shown, which represents the F-Tanθ distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within -45% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.

[0477] Fig.88 The MTF (Modulation Transfer Function) curve of Example 15 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.4 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.

[0478] Fig.89 The axial aberration curve of Example 15 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -10μm to 16μm, indicating that the optical lens can correct the axial aberration well.

[0479] Fig.90 The vertical chromatic aberration curve of Example 15 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 7 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.

[0480] Please refer to Table 16, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH and the maximum field of view FOV of the optical lens, and the numerical values ​​corresponding to each conditional expression in each embodiment.

[0481] Table 16-1

[0482] Parameters and Conditionals Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 f(mm) 5.17 5.14 7.45 7.36 7.77 4.20 4.23 FOV(°) 90.00 90.00 60.00 60.00 60.00 120.00 120.00 EPD(mm) 2.58 2.57 3.73 3.68 3.88 2.10 2.12 TTL(mm) 33.22 34.62 32.98 32.64 31.76 32.16 32.44 FNO 2.00 2.00 2.00 2.00 2.00 2.00 2.00 IH(mm) 8.06 8.06 8.07 8.07 8.06 8.06 8.06 CRA(°) 17.68 17.22 15.94 18.45 11.95 18.68 17.40 TTL / f 6.43 6.74 4.42 4.44 4.09 7.65 7.66 TTL / IH 4.12 4.30 4.09 4.05 3.94 3.99 4.02 (IH / 2) / (f×tan(FOV / 2)) 0.78 0.78 0.94 0.95 0.90 0.55 0.55 FOV / FNO(°) 45.00 45.00 30.00 30.00 30.00 60.00 60.00 IH / EPD 3.12 3.14 2.16 2.19 2.08 3.83 3.81 IH / f 1.56 1.57 1.08 1.10 1.04 1.92 1.90 BFL / f 1.14 1.27 0.68 0.63 0.88 1.55 1.54 (FOV / 2) / CRA 2.55 2.61 1.88 1.63 2.51 3.21 3.45 FOV*f / IH 57.69 57.39 55.44 54.73 57.78 62.60 63.02 TTL / IH / FOV 0.18 0.19 0.27 0.27 0.26 0.13 0.13 <![CDATA[D1 / IH / tan(FOV / 2)]]> 1.65 1.72 2.64 2.62 2.30 1.00 0.95 <![CDATA[f1 / f]]> -2.51 -2.76 -2.54 -2.61 -2.24 -2.13 -1.96 <![CDATA[f2 / f]]> -1.43E+05 -3.78E+07 -7.31E+09 -2.20E+04 -21.28 -5.01E+09 -121.86 <![CDATA[f3 / f]]> -4.94 -3.28 -3.10 -2.46 -2.98 -6.54 -6.77 <![CDATA[f4 / f]]> 1.23 1.18 0.82 0.81 0.80 1.56 1.54 <![CDATA[f5 / f]]> -0.91 -0.92 -1.21 -0.65 -0.63 -1.13 -1.15 <![CDATA[f6 / f]]> 1.21 1.22 0.93 0.94 0.87 1.47 1.52 <![CDATA[f7 / f]]> 6.32 6.87 6.71 6.74 6.20 5.64 4.19 <![CDATA[f 14 / f]]> 0.86 0.87 0.75 0.83 0.78 0.99 1.09 <![CDATA[f 57 / f]]> 14.99 13.13 34.04 14.58 5.69 8.02 5.69

[0483] Table 16-2

[0484]

[0485] In summary of the above embodiments, the optical lens provided by the present invention has an infrared confocal function, which meets the clarity requirements of imaging during the day and at night. By reasonably configuring the surface shapes of each lens and reasonably matching the optical focal length, the resolution of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

[0486] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0487] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface: The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a second lens having optical power, wherein the object side surface is concave and the image side surface is convex; a third lens having negative optical power; The fourth lens has positive refractive power, and both the object side surface and the image side surface are convex; Aperture; A fifth lens having negative optical power, wherein both the object side surface and the image side surface are concave; The sixth lens has positive refractive power, and both the object side surface and the image side surface are convex; a seventh lens having positive refractive power; The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: |f2 / f|>18; the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.0 <f1 / f<-1.8。 2. The optical lens according to claim 1, characterized in that: The total optical length TTL and the effective focal length f of the optical lens satisfy: 3.5 <TTL / f<8.5。 3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy the following conditions: 0.5<(IH / 2) / (f×tan(FOV / 2))<1.

0.

4. The optical lens according to claim 1, characterized in that: The maximum field of view FOV and aperture value FNO of the optical lens satisfy: 25°<FOV / FNO<65°.

5. The optical lens according to claim 1, characterized in that: The real image height IH and entrance pupil diameter EPD corresponding to the maximum field of view of the optical lens meet the following requirements: 2.0 <IH / EPD<4.0。 6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 1.0 <IH / f<2.0。 7. The optical lens according to claim 1, characterized in that: The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side of the first lens satisfy the following conditions: 0.9<D1 / IH / tan(FOV / 2)<2.

8.

8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -1.5 <f5 / f<-0.5。 9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 4.0 <f7 / f<7.5。

Images