Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and comprises a front lens group with negative optical power and a rear lens group with positive optical power. The front lens group comprises a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power and a seventh lens with optical power. The image side surface of the first lens is concave, the object side surface of the second lens is concave, the image side surface of the second lens is convex, the object side surface of the third lens is convex, the image side surface of the third lens is convex, the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave, the image side surface of the sixth lens is convex near the optical axis, and the object side surface of the seventh lens is concave near the optical axis, and the image side surface of the seventh lens is convex. The optical lens provided by the application has one or more advantages of super wide angle, super large aperture, large imaging surface, high pixel, high imaging quality and the like.

Description

TECHNICAL FIELD

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

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved. In the field of vehicle driving, the conventional driving recorder lens cannot simultaneously compatible with large aperture, large wide angle, high pixel and many other advantages. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with one or more advantages such as ultra-wide angle, ultra-large aperture, high pixel, etc.

[0004] The present application provides an optical lens, which has seven lenses, and sequentially includes, along the optical axis from the object side to the imaging surface: a front lens group with negative focal power, a rear lens group with positive focal power;

[0005] The front lens group sequentially includes, along the optical axis from the object side to the imaging surface:

[0006] The first lens with negative focal power has a concave image side surface;

[0007] The second lens with positive focal power has a concave object side surface and a convex image side surface;

[0008] The rear lens group sequentially includes, along the optical axis from the object side to the imaging surface:

[0009] The third lens with positive focal power has a convex object side surface and a convex image side surface;

[0010] The fourth lens with positive focal power;

[0011] The fifth lens with positive focal power has a convex image side surface;

[0012] The sixth lens with positive focal power has a concave object side surface and a convex image side surface near the optical axis;

[0013] The seventh lens with focal power has a concave object side surface near the optical axis and a convex image side surface;

[0014] Wherein, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130°<FOV / Fno<150°.

[0015] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.5<TTL / f<7.8.

[0016] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.6 < TTL / IH < 3.

[0017] Further preferably, the maximum light passing aperture DM1 of the first lens, the real image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 0.42 < DM1 / IH / tan(FOV / 2) < 0.6.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.5 < f1 / f < -2.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 12 < f2 / f < 50; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: -1.5 < R3 / f < -0.7.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.2 < f3 / f < 2.6; the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -2.5.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 20 < f4 / f < 220.

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

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 10.5 < f6 / f < 18.5.

[0024] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10 < |f7 / f| < 55; the image side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -1 < R14 / f < -0.75.

[0025] Compared with the prior art, the optical lens provided by the present application adopts seven lenses with specific focal lengths, and through specific surface shape matching and reasonable focal length distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality, etc. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0027] Figure 1 A schematic diagram of the optical lens in Example 1 of the present application.

[0028] Figure 2 A field curvature curve of the optical lens in Example 1 of the present application.

[0029] Figure 3 An f-θ distortion curve of the optical lens in Example 1 of the present application.

[0030] Figure 4 An axial aberration curve of the optical lens in Example 1 of the present application.

[0031] Figure 5 A lateral chromatic aberration curve of the optical lens in Example 1 of the present application.

[0032] Figure 6 A schematic diagram of the optical lens in Example 2 of the present application.

[0033] Figure 7 A field curvature curve of the optical lens in Example 2 of the present application.

[0034] Figure 8 An f-θ distortion curve of the optical lens in Example 2 of the present application.

[0035] Figure 9 An axial aberration curve of the optical lens in Example 2 of the present application.

[0036] Figure 10 A lateral chromatic aberration curve of the optical lens in Example 2 of the present application.

[0037] Figure 11 A schematic diagram of the optical lens in Example 3 of the present application.

[0038] Figure 12 A field curvature curve of the optical lens in Example 3 of the present application.

[0039] Figure 13 An f-θ distortion curve of the optical lens in Example 3 of the present application.

[0040] Figure 14 An axial aberration curve of the optical lens in Example 3 of the present application.

[0041] Figure 15 A lateral chromatic aberration curve of the optical lens in Example 3 of the present application.

[0042] Figure 16 A structure diagram of an optical lens in Embodiment 4 of the present application.

[0043] Figure 17 A field curvature curve of the optical lens in Embodiment 4 of the present application.

[0044] Figure 18 An f-θ distortion curve of the optical lens in Embodiment 4 of the present application.

[0045] Figure 19 An axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0046] Figure 20 A transverse chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0047] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0048] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0049] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0050] In the drawings, the thickness, size, and shape of lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawings is shown by way of example. That is, the shape of a spherical surface or an aspherical surface is not limited to the shape of a spherical surface or an aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0051] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0052] It should also be understood that the use of the terms "have", "has", "having", "include", "including", "comprise", "comprising", "contain" or "containing" when used in this specification, specifies the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the use of "can" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to mean an example or an illustration.

[0053] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0054] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] The optical lens provided by the embodiments of the present application comprises seven lenses, and comprises, in order from the object side to the imaging surface along the optical axis, a front lens group with negative optical power and a rear lens group with positive optical power.

[0056] Specifically, the front lens group comprises, in order from the object side to the imaging surface along the optical axis, a first lens and a second lens. The first lens can have negative optical power, the object side surface thereof can be concave or convex, and the image side surface thereof is concave. The second lens can have positive optical power, the object side surface thereof is concave, and the image side surface thereof is convex.

[0057] Specifically, the rear lens group comprises, in order from the object side to the imaging surface along the optical axis, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The third lens can have positive optical power, the object side surface thereof is convex, and the image side surface thereof is convex. The fourth lens can have positive optical power, the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The fifth lens can have positive optical power, the object side surface thereof can be concave or convex, and the image side surface thereof is convex. The sixth lens can have positive optical power, the object side surface thereof is concave, and the image side surface thereof is convex near the optical axis. The seventh lens can have positive optical power or negative optical power, the object side surface thereof is concave near the optical axis, and the image side surface thereof is convex.

[0058] In some embodiments, the optical lens can further include a diaphragm, which can be located between the second lens and the third lens, i.e., between the front lens group and the rear lens group. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.

[0059] In some embodiments, the optical lens can further include a filter and a protective glass, which can be sequentially arranged along the optical axis between the seventh lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens to prevent the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0060] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130°<FOV / Fno<150°. Satisfying the above condition is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, realizing the characteristics of the super wide-angle and large aperture of the lens. The realization of the super wide-angle characteristic is conducive to the optical lens to obtain more scene information to meet the demand of large range detection, and the realization of the large aperture characteristic is conducive to improving the problem of rapid decline of relative brightness of the edge field of view brought by the wide angle, thereby also conducive to obtaining more scene information.

[0061] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.5<TTL / f<7.8. Satisfying the above condition can effectively limit the length of the lens, which is conducive to realizing the miniaturization of the optical lens.

[0062] In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.6<TTL / IH<3. Satisfying the above condition can better realize the miniaturization of the lens, while ensuring that the lens has a larger image surface under the condition of the same total length, which can match a larger size imaging chip to realize high-definition imaging.

[0063] In some embodiments, the maximum light receiving aperture DM1 of the first lens, the real image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 0.42<DM1 / IH / tan(FOV / 2)<0.6. Satisfying the above condition ensures that the lens has a larger light receiving surface to realize the super wide-angle imaging of the lens, while also facilitating the reduction of the rear end aperture of the lens to realize the miniaturization of the optical lens.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.5 < f1 / f < -2. The first lens with appropriate negative refractive power can slow down the incident angle of light at the second lens, effectively reduce the aperture of subsequent lenses, and maintain the miniaturization of the lens while ensuring an increased field of view.

[0065] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 12 < f2 / f < 50; and the object side surface radius of curvature R3 of the second lens and the effective focal length f of the optical lens satisfy: -1.5 < R3 / f < -0.7. The second lens with appropriate positive refractive power and meniscus shape can effectively converge a wide range of light entering the system, correct the off-axis aberration caused by the first lens, and improve the imaging quality of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.2 < f3 / f < 2.6; and the image side surface radius of curvature R6 of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -2.5. The above conditions can effectively reduce the difficulty of edge field distortion correction, ensure a smaller distortion while achieving a large field of view, improve the overall imaging quality, reduce system sensitivity, and improve manufacturing yield.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 20 < f4 / f < 220. The above conditions can facilitate smooth transition of light, improve the imaging quality of the optical lens, reduce system sensitivity, and improve manufacturing yield.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 1.5. The above conditions can balance the astigmatism and field curvature of 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 f6 of the sixth lens satisfy: 10.5 < f6 / f < 18.5. The above conditions can balance the astigmatism and field curvature of the optical lens, and improve the imaging quality of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10<|f7 / f|<55; the image-side surface curvature radius R14 of the seventh lens and the effective focal length f of the optical lens satisfy: -1<R14 / f<-0.75. Satisfying the above conditions, the incident light is diverged to a certain extent, the peripheral light and the central light are turned up to a higher imaging position, and the large target surface imaging of the lens is better achieved, and the imaging quality is improved.

[0071] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6<BFL / f<0.8. Satisfying the above conditions, the lens has a larger optical back focal length, which is beneficial to reduce the interference between the lens and the imaging chip, ensures the compatibility of the lens and the body, and makes the structure of the lens more compact.

[0072] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 53°<(f×FOV) / IH<65°. Satisfying the above conditions, by reasonably limiting the relationship among the focal length, the field of view, and the image height of the optical lens, the balance between the large field of view and the large target surface imaging of the optical lens is achieved.

[0073] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.2<IH / EPD<3. Satisfying the above conditions, the width of the incident light beam at different field angles can be effectively increased, so that the brightness of the optical lens at the image plane is improved to avoid the generation of dark corners, and the imaging area of the optical lens is increased to achieve large target surface imaging of the lens.

[0074] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: 0.03<f5 / f6<0.1. Satisfying the above conditions, the light is smoothly transitioned, and various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.

[0075] In some embodiments, the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy: 0.7<R3 / R4<1. Satisfying the above conditions, by setting the second lens to be a meniscus shape close to a concentric circle, the deflection angle of the light in the second lens can be moderated, and the chromatic aberration and distortion generated by the first lens can be effectively balanced, and the overall imaging quality is improved.

[0076] In some embodiments, the object-side surface curvature radius R5 of the third lens and the image-side surface curvature radius R6 of the third lens satisfy -1.5 < R5 / R6 < -0.2. By setting the biconvex surface type of the third lens, the light rays can be better converged, the distance of the light rays reaching the next lens can be shortened, and the total length of the optical lens can be reduced.

[0077] In some embodiments, the object-side surface curvature radius R11 of the sixth lens and the image-side surface curvature radius R12 of the sixth lens satisfy 0.7 < R11 / R12 < 0.95. By satisfying the above condition, the light rays can be better converged, the distance of the light rays reaching the next lens can be shortened, and the total length of the optical lens can be reduced.

[0078] In some embodiments, the object-side surface curvature radius R13 of the seventh lens and the image-side surface curvature radius R14 of the seventh lens satisfy 0.5 < R13 / R14 < 0.8. By reasonably controlling the curvature radii of the object-side surface and the image-side surface of the seventh lens, the incident angle of the light rays on the image plane can be reduced, the illumination of the edge field of view can be enhanced, and the optical lens can be matched with an imaging chip having a small chief ray angle (CRA).

[0079] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens along the optical axis ∑CT and the total length of the optical lens TTL satisfy 0.55 < ∑CT / TTL < 0.66. By satisfying the above condition, the total length of the optical lens can be effectively compressed, and the structure design and production process of the optical lens can be facilitated.

[0080] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f37 of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens satisfy -3 < f12 / f37 < -1.2. By reasonably setting the focal length relationship of the lens groups before and after the stop, the smooth transition of the light rays can be facilitated, the field of view angle of the optical imaging lens can be expanded, the difficulty of correcting the distortion and the chromatic aberration of the rear lens group can be reduced, and the image quality of the optical lens can be improved.

[0081] In some embodiments, the optical lens satisfies the conditions: 24.5 mm < TTL < 26.5 mm, 3 mm < f < 4 mm, 140° < FOV < 150°, 8.6 mm < IH < 9.2 mm, and 0.9 < Fno < 1.1, where TTL represents the total length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, and Fno represents the aperture value of the optical lens. By satisfying the above conditions, the lens has a large field of view angle, can realize a large range of shooting, has a large aperture value, and can realize high-definition imaging even in a dark environment.

[0082] In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic hybrid material collocation structure. Preferably, the optical lens of the present application adopts a seven-lens glass-plastic hybrid collocation structure, which can improve the thermal stability. Specifically, the first lens and the third lens can adopt glass lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can all be plastic lenses. The glass-plastic hybrid structure can effectively reduce the cost, correct the aberration, reduce the size, and provide a higher cost-effective optical lens product.

[0083] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens and the third lens in the optical lens provided by the present application can adopt spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0084] In various embodiments of the present application, when the lenses adopt aspherical lenses, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0085] ;

[0086] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients, respectively.

[0087] The present application will be further described in the following embodiments. In various embodiments, the thickness, the radius of curvature, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and all are included in the protection scope of the present application.

[0088] Embodiment 1

[0089] Please refer to Figure 1Fig. 1 is a structural schematic diagram of an optical lens 100 provided in Embodiment 1 of the present application, which comprises, in sequence from the object side to the imaging surface S19 along the optical axis, a front lens group with negative focal power, a stop ST, a rear lens group with positive focal power, a filter G1 and a protective glass G2.

[0090] The front lens group comprises, in sequence from the object side to the imaging surface along the optical axis, a first lens L1 and a second lens L2.

[0091] The first lens L1 has negative focal power, the object side surface S1 is concave, and the image side surface S2 is concave.

[0092] The second lens L2 has positive focal power, the object side surface S3 is concave, and the image side surface S4 is convex.

[0093] The rear lens group comprises, in sequence from the object side to the imaging surface along the optical axis, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7.

[0094] The third lens L3 has positive focal power, the object side surface S5 is convex, and the image side surface S6 is convex.

[0095] The fourth lens L4 has positive focal power, the object side surface S7 is concave, and the image side surface S8 is convex.

[0096] The fifth lens L5 has positive focal power, the object side surface S9 is convex, and the image side surface S10 is convex.

[0097] The sixth lens L6 has positive focal power, the object side surface S11 is concave, and the image side surface S12 is convex at the near optical axis.

[0098] The seventh lens L7 has positive focal power, the object side surface S13 is concave at the near optical axis, and the image side surface S14 is convex.

[0099] The object side surface S15 and the image side surface S16 of the filter G1 are both flat.

[0100] The object side surface S17 and the image side surface S18 of the protective glass G2 are both flat.

[0101] The imaging surface S19 is flat.

[0102] The first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0103] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0104] Table 1-1

[0105]

[0106] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0107] Table 1-2

[0108]

[0109] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0110] Figure 2 A field curvature graph of the optical lens 100 in this embodiment is shown, showing the degree of curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field angle (unit: degrees). As can be seen from the graph, the field curvature in the meridional and sagittal image planes is controlled within ±0.15mm, indicating that the optical lens 100 can effectively correct for field curvature.

[0111] Figure 3 The f-θ distortion curve of the optical lens 100 in this embodiment is shown. It shows the distortion at different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the distortion value is controlled within ±10%, indicating that the optical lens 100 is able to correct distortion well.

[0112] Figure 4 The following is a graph showing the axial aberration of the optical lens 100 in this embodiment, which shows the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0113] Figure 5 A graph of vertical chromatic aberration for the optical lens 100 in this embodiment shows the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging plane. 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 of view. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±7 μm, indicating that the optical lens 100 is capable of effectively correcting chromatic aberration.

[0114] Example 2

[0115] Please refer to Figure 6 , which is a structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the object side S7 of the fourth lens L4 is a convex surface; the image side S8 of the fourth lens L4 is a concave surface; the object side S9 of the fifth lens L5 is a concave surface at the near optical axis; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0116] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0117] Table 2-1

[0118]

[0119] The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0120] Table 2-2

[0121]

[0122] In this embodiment, the field curvature curve, the f-θ distortion curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.

[0123] As can be seen from Figure 7 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which indicates that the optical lens 200 can correct the field curvature well.

[0124] As can be seen from Figure 8 , the distortion value is controlled within ±8%, which indicates that the optical lens 200 can correct the distortion well.

[0125] As can be seen from Figure 9 , the offset of the axial aberration is controlled within ±0.1 mm, which indicates that the optical lens 200 can correct the axial aberration well.

[0126] As can be seen from Figure 10 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±7 μm, which indicates that the optical lens 200 can correct the chromatic aberration well.

[0127] Embodiment 3

[0128] Please refer to Figure 11, which is a structural schematic view of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the object side S1 of the first lens L1 is a convex surface; the object side S9 of the fifth lens L5 is a concave surface; and the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0129] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0130] Table 3-1

[0131]

[0132] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0133] Table 3-2

[0134]

[0135] In this embodiment, the field curvature curve, the f-θ distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 300 are shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 respectively.

[0136] As can be seen from Figure 12 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which indicates that the optical lens 300 can correct the field curvature well.

[0137] As can be seen from Figure 13 , the distortion value is controlled within ±10%, which indicates that the optical lens 300 can correct the distortion well.

[0138] As can be seen from Figure 14 , the offset of the axial aberration is controlled within ±0.1 mm, which indicates that the optical lens 300 can correct the axial aberration well.

[0139] As can be seen from Figure 15 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±6 μm, which indicates that the optical lens 300 can correct the chromatic aberration well.

[0140] Embodiment 4

[0141] Please refer to Figure 16Fig. 4 is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference is that the seventh lens L7 has a negative focal power; the object side S1 of the first lens L1 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0142] The related parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0143] Table 4-1

[0144]

[0145] The surface type parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0146] Table 4-2

[0147]

[0148] In this embodiment, the field curvature curve, f-θ distortion curve, axial aberration curve and transverse chromatic aberration curve of the optical lens 400 are shown in Figure 17 、 Figure 18 、 Figure 19 、 Figure 20

[0149] As can be seen from Figure 17 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which indicates that the optical lens 400 can correct the field curvature well.

[0150] As can be seen from Figure 18 , the distortion value is controlled within ±10%, which indicates that the optical lens 400 can correct the distortion well.

[0151] As can be seen from Figure 19 , the shift amount of the axial aberration is controlled within ±0.08 mm, which indicates that the optical lens 400 can correct the axial aberration well.

[0152] As can be seen from Figure 20 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, which indicates that the optical lens 400 can correct the chromatic aberration well.

[0153] Table 5 is the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each condition in each embodiment.

[0154] Table 5​

[0155]

[0156] In summary, the optical lens provided by the present application adopts seven pieces of glass-plastic hybrid structure, and through specific surface shape setting and reasonable power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of super wide angle, super large aperture, large image surface, high pixel, high imaging quality, and the like.

[0157] In the description of the present specification, the description referring to the terms “one embodiment”, “some embodiments”, “an example”, “a specific example”, or “some examples” and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0158] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It successively includes, from the object side to the imaging surface along the optical axis: a front lens group with a negative optical power and a rear lens group with a positive optical power; The front lens group successively includes, from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose image side is concave; A second lens with a positive optical power, whose object side is concave and whose image side is convex; The rear lens group successively includes, from the object side to the imaging surface along the optical axis: A third lens with a positive optical power, whose object side is convex and whose image side is convex; A fourth lens with a positive optical power; A fifth lens with a positive optical power, whose image side is convex; A sixth lens with a positive optical power, whose object side is concave and whose image side is convex near the optical axis; A seventh lens with an optical power, whose object side is concave near the optical axis and whose image side is convex; Wherein, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130° < FOV / Fno < 150°.

2. The optical lens according to claim 1, wherein: The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.5 < TTL / f < 7.

8.

3. The optical lens according to claim 1, wherein: The overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.6 < TTL / IH < 3.

4. The optical lens according to claim 1, wherein: The maximum clear aperture DM1 of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.42 < DM1 / IH / tan(FOV / 2) < 0.

6.

5. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -3.5 < f1 / f < -2.

6. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 12 < f2 / f < 50; the curvature radius R3 of the object side of the second lens and the effective focal length f of the optical lens satisfy: -1.5 < R3 / f < -0.

7.

7. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2.2 < f3 / f < 2.6; the curvature radius R6 of the image side of the third lens and the effective focal length f of the optical lens satisfy: -6 < R6 / f < -2.

5.

8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 20 < f4 / f < 220.

9. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.5 < f5 / f < 1.

5.

10. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 10.5 < f6 / f < 18.

5.

11. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 10 < |f7 / f| < 55; the curvature radius R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: -1 < R14 / f < -0.75.

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