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 the seven lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is a convex surface; a fifth lens with positive optical power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; a sixth lens with negative optical power, wherein the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power. The optical lens provided by the application has one or more advantages of a large field of view, a large image surface, a large aperture, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

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.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. In addition to the requirements of optical lenses for the existing ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is also required to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0005] The technical scheme adopted by the present application is:

[0006] An optical lens, a total of seven lenses, including in order along the optical axis from the object side to the imaging surface:

[0007] The first lens with negative focal power, the object side surface is convex, and the image side surface is concave;

[0008] The second lens with negative focal power;

[0009] The third lens with positive focal power, the object side surface is convex, and the image side surface is concave;

[0010] The fourth lens with positive focal power, the object side surface is convex;

[0011] The fifth lens with positive focal power, the object side surface is convex, and the image side surface is concave;

[0012] The sixth lens with negative focal power, the object side surface is convex, and the image side surface is concave;

[0013] The seventh lens with positive focal power;

[0014] Wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2<IH / f<2.4.

[0015] It is further preferred that the total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4 < TTL / f < 11.8; the total track 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: 3.4 < TTL / IH < 5.5.

[0016] It is further preferred that the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 80° < FOV / Fno < 89°; the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.3 < IH / EPD < 3.8.

[0017] It is further preferred that the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 80° < FOV / Fno < 89°; the real image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.3 < IH / EPD < 3.8.

[0018] It is further preferred that the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -24 < f2 / f < -5; the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.4 < f6 / f < -1.4.

[0019] It is further preferred that the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.2 < f3 / f < 7; the object side surface curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 1.8 < R5 / f < 3.2; the image side surface curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: 4 < R6 / f < 11.

[0020] It is further preferred that the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.6 < f5 / f < 4.4; the object side surface curvature radius R9 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3 < R9 / f < 1.8; the image side surface curvature radius R10 of the fifth lens and the effective focal length f of the optical lens satisfy: 5 < R10 / f < 53.

[0021] It is further preferred that the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: 0.5 < R3 / R4 < 3.1; the object side surface curvature radius R13 of the seventh lens and the image side surface curvature radius R14 of the seventh lens satisfy: 0.2 < R13 / R14 < 19.

[0022] It is further preferred that the object-side surface curvature radius R5 of the third lens and the image-side surface curvature radius R6 of the third lens satisfy: -0.57 < (R5-R6) / (R5+R6) < -0.34; the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: -0.95 < (R9-R10) / (R9+R10) < -0.48.

[0023] It is further preferred that the object-side surface half-field radius of the fifth lens d9 and the object-side surface sag of the fifth lens Sag9 satisfy: 0.23 < Sag9 / d9 < 0.33; the image-side surface half-field radius of the fifth lens d10 and the image-side surface sag of the fifth lens Sag10 satisfy: 0 < Sag10 / d10 < 0.09.

[0024] The optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of large field of view, large image surface, large aperture, high imaging quality, and the like. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0027] Figure 2 FIG. 2 is an MTF curve diagram of the optical lens according to the embodiment 1 of the present application.

[0028] Figure 3 FIG. 3 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0029] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens according to the embodiment 2 of the present application.

[0030] Figure 5 FIG. 5 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0031] Figure 6 FIG. 6 is an MTF curve diagram of the optical lens according to the embodiment 3 of the present application.

[0032] Figure 7 FIG. 7 is a structural schematic diagram of an optical lens according to an embodiment of the present application.

[0033] Figure 8The MTF curve diagram of the optical lens in Embodiment 4 of the present application.

[0034] Figure 9 The structural schematic diagram of the optical lens in Embodiment 5 of the present application.

[0035] Figure 10 The MTF curve diagram of the optical lens in Embodiment 5 of the present application.

[0036] Figure 11 The structural schematic diagram of the optical lens in Embodiment 6 of the present application.

[0037] Figure 12 The MTF curve diagram of the optical lens in Embodiment 6 of the present application.

[0038] Figure 13 The structural schematic diagram of the optical lens in Embodiment 7 of the present application.

[0039] Figure 14 The MTF curve diagram of the optical lens in Embodiment 7 of the present application.

[0040] Figure 15 The structural schematic diagram of the optical lens in Embodiment 8 of the present application.

[0041] Figure 16 The MTF curve diagram of the optical lens in Embodiment 8 of the present application.

[0042] Figure 17 The structural schematic diagram of the optical lens in Embodiment 9 of the present application.

[0043] Figure 18 The MTF curve diagram of the optical lens in Embodiment 9 of the present application.

[0044] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0045] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the description, 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.

[0046] It should be noted that in the present specification, the expressions first, second, third and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0047] In the drawings, the thickness, size, and shape of the lenses have been exaggerated slightly for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0048] In this document, the paraxial region refers to a region near the optical axis. If the 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 the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens.

[0049] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean 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 "may" means that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0050] 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.

[0051] 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 conjunction with the embodiments.

[0052] The optical lens provided by the embodiment of the present application is composed of seven lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0053] In some embodiments, the first lens can have a negative focal power, a convex object side surface, and a concave image side surface. The second lens can have a negative focal power, a convex or concave object side surface, and a convex or concave image side surface. The third lens can have a positive focal power, a convex object side surface, and a concave image side surface. The fourth lens can have a positive focal power, a convex object side surface, and a convex or concave image side surface. The fifth lens can have a positive focal power, a convex object side surface, and a concave image side surface. The sixth lens can have a negative focal power, a convex object side surface, and a concave image side surface. The seventh lens can have a positive focal power, a convex or concave object side surface, and a convex or concave image side surface.

[0054] In some embodiments, the second lens can have a negative focal power, a convex object side surface, and a concave image side surface, or a concave object side surface and a convex image side surface. The seventh lens can have a positive focal power, a convex object side surface, and a concave image side surface, or a concave object side surface and a convex image side surface.

[0055] In some embodiments, the optical lens can further include a diaphragm, which can be located between the third lens and the fourth lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. In addition, when the diaphragm is located between the third lens and the fourth lens, the diaphragm can reasonably distribute the functions of the first lens to the seventh lens, for example, the first lens, the second lens, and the third lens can be used to receive light to a greater extent, and the fourth lens to the seventh lens can be used to correct the function of the aberration, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the third lens and the fourth lens, the diaphragm aberration can be corrected.

[0056] In some embodiments, the optical lens can further include a filter, which is located between the seventh lens and the imaging surface along the optical axis. The filter is used to filter out interference light to prevent interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0057] 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. In addition, the glued lens can reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0058] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2<IH / f<2.4. Satisfying the above range is helpful to realize the large image surface characteristic and improve the imaging quality of the optical lens. More specifically, 2.04<IH / f<2.33.

[0059] In some embodiments, the optical total track length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4 < TTL / f < 11.8; the optical total track length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.4 < TTL / IH < 5.5. Satisfying the above ranges helps to ensure sufficient space to adjust the structures of the lenses inside the optical lens, optimize the imaging effect, and balance the requirements of the image size and the overall size of the optical lens. More specifically, 7.46 < TTL / f < 11.74; 3.4 < TTL / IH < 5.42.

[0060] In some embodiments, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 80° < FOV / Fno < 89°; the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.3 < IH / EPD < 3.8. Satisfying the above ranges is conducive to expanding the field angle of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the requirement of large-range detection, and the implementation of the large-aperture feature is conducive to improving the problem of rapid decline of relative luminance at the edge of the field of view, thereby also conducive to obtaining more scene information, and increasing the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image plane is improved to avoid dark corners, and the relative luminance at the edge of the image plane of the optical lens is improved. More specifically, 80.24° < FOV / Fno < 88.62°, 3.31 < IH / EPD < 3.77.

[0061] In some embodiments, the object side half aperture radius d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.59 < d1 / (IH / 2) / tan(FOV / 2) < 1.2; the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the optical lens satisfy: 2.1 < f4567 / f < 3.5. Satisfying the above ranges can effectively control the front aperture and the rear aperture of the optical lens, improve the structural stability of the optical lens, and reasonably control the focal length proportion of the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the optical lens, which helps to balance the lens aberration and improve the imaging quality. More specifically, 0.59 < d1 / (IH / 2) / tan(FOV / 2) < 1.16; 2.15 < f4567 / f < 3.45.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -24 < f2 / f < -5; the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.4 < f6 / f < -1.4. Satisfying the above ranges, by reasonably allocating the proportion of negative optical power of the second lens, the negative optical power of the front-end lens is shared, avoiding excessive light refraction caused by excessive concentration of optical power, and reducing the difficulty of chromatic aberration correction of the optical lens; by reasonably allocating the proportion of negative optical power of the sixth lens, the imaging area of the lens is increased, and the imaging quality is improved. More specifically, -23.26 < f2 / f < -5.32, and -2.39 < f6 / f < -1.43.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.2 < f3 / f < 7; the radius of curvature R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 1.8 < R5 / f < 3.2; the radius of curvature R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 4 < R6 / f < 11. Satisfying the above ranges, by reasonably allocating the proportion of positive optical power of the third lens, the light rays are converged, the light refraction angle is reduced, the light ray trend is stable, and by limiting the shape of the object side surface and the image side surface of the third lens, the difficulty of aberration correction of the rear-end lens is reduced. More specifically, 4.24 < f3 / f < 6.86, 1.83 < R5 / f < 3.2, and 4.1 < R6 / f < 10.1.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.6 < f5 / f < 4.4; the radius of curvature R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3 < R9 / f < 1.8; the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 5 < R10 / f < 53. Satisfying the above ranges, by reasonably allocating the proportion of positive optical power of the fifth lens, the lens aberration is balanced, the imaging quality is improved, and by limiting the shape of the object side surface and the image side surface of the fifth lens, the spherical aberration is optimized, and the imaging quality is improved. More specifically, 2.61 < f5 / f < 4.36, 1.39 < R9 / f < 1.72, and 5.01 < R10 / f < 52.3.

[0065] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: 0.5 < R3 / R4 < 3.1; the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.2 < R13 / R14 < 19. By satisfying the above ranges, the shape of the object side surface and the image side surface of the second lens and the shape of the object side surface and the image side surface of the seventh lens are reasonably limited, which helps to make the light ray smooth, reduce the generation of aberration, and improve the imaging quality. More specifically, 0.51 < R3 / R4 < 3.09, and 0.2 < R13 / R14 < 18.89.

[0066] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -0.57 < (R5-R6) / (R5+R6) < -0.34; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -0.95 < (R9-R10) / (R9+R10) < -0.48. By satisfying the above ranges, the shape of the object side surface and the image side surface of the third lens and the shape of the object side surface and the image side surface of the fifth lens are reasonably limited, which helps to control the increase of the marginal field of view beam height while reducing the off-axis aberration of the optical lens.

[0067] In some embodiments, the half-field radius of the object side surface of the fifth lens d9 and the sagittal height Sag9 of the object side surface of the fifth lens satisfy: 0.23 < Sag9 / d9 < 0.33; the half-field radius of the image side surface of the fifth lens d10 and the sagittal height Sag10 of the image side surface of the fifth lens satisfy: 0 < Sag10 / d10 < 0.09. By satisfying the above ranges, the light ray trend of the marginal field of view is controlled, and the central field of view detail information of the optical lens is highlighted.

[0068] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.6 < BFL / f < 1.7. By satisfying the above ranges, the optical lens has a suitable back focal length, which facilitates the reasonable arrangement of the positions of the lenses and reduces the processing and assembly difficulty. More specifically, 0.64 < BFL / f < 1.67.

[0069] In some embodiments, the total length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis satisfy: 0.24 < ∑CT / TTL < 0.64; the total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.73 < ∑CT / f < 5.86. By satisfying the above ranges, high-pixel characteristics can be achieved, the imaging quality of the optical lens is improved, and the production cost is reduced.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -4.5 < f1 / f < -1.8. By reasonably limiting the proportion of the negative refractive power of the first lens, the light rays can be collected at a large angle, and more scene information can be obtained when the above range is satisfied. More specifically, -4.42 < f1 / f < -1.8.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.2 < f4 / f < 3.2. By reasonably limiting the proportion of the positive refractive power of the fourth lens, the field curvature of the optical lens can be reduced, and the imaging quality can be improved when the above range is satisfied. More specifically, 2.28 < f4 / f < 3.14.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.1 < f7 / f < 5.7. By reasonably limiting the proportion of the positive refractive power of the seventh lens, the spherical aberration can be optimized, and the imaging quality can be improved when the above range is satisfied. More specifically, 3.11 < f7 / f < 5.62.

[0073] In some embodiments, the effective focal length f of the optical lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: -8.4 < f56 / f < -3. By satisfying the above range, the chromatic aberration can be corrected, the sensitivity to decentration of the optical lens can be reduced, and the aberration can be balanced. More specifically, -8.4 < f56 / f < -3.04.

[0074] In some embodiments, the object side surface radius of curvature R11 of the sixth lens and the effective focal length f of the optical lens satisfy: 5 < R11 / f < 53; the image side surface radius of curvature R2 of the sixth lens and the effective focal length f of the optical lens satisfy: 1.1 < R12 / f < 1.6. By reasonably limiting the surface shape of the sixth lens, the aberration can be further reduced when the above range is satisfied. More specifically, 5.01 < R11 / f < 52.3, and 1.19 < R12 / f < 1.54.

[0075] In some embodiments, the object side surface radius of curvature R5 of the third lens and the image side surface radius of curvature R6 of the third lens satisfy: 0.27 < R5 / R6 < 0.5; the object side surface radius of curvature R9 of the fifth lens and the image side surface radius of curvature R10 of the fifth lens satisfy: 0.02 < R9 / R10 < 0.35. By satisfying the above range, the light rays can be smoothly transitioned, the distortion of the edge field of view can be effectively corrected, the deformation degree of the edge of the captured scene can be reduced, and the scene quality can be improved.

[0076] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: |(R3-R4) / (R3+R4)|<0.52; the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 0.52<(R11-R12) / (R11+R12)<0.96. By reasonably limiting the surface shape of the second lens and the sixth lens, the light path is smooth, and the imaging quality is improved. More specifically, -0.32<(R3-R4) / (R3+R4)<0.52.

[0077] In some embodiments, the optical lens satisfies the following conditions: 3.9mm<f<4.2mm; 120°<FOV<150°; 2.4mm<EPD<2.7mm; 31mm<TTL<49mm; 1.5<Fno<1.7; 8.4mm<IH<9.3mm; 20°<CRA<26°; 2.7mm<BFL<7mm. In the above conditions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray angle of incidence of the optical lens, and BFL represents the back focal length of the optical lens. Satisfying the above ranges, the optical lens has one or more advantages such as a large field of view angle, a large image surface, a large aperture, high imaging quality, etc. More specifically, 3.97mm<f<4.16mm; 2.45mm<EPD<2.62mm; 31mm<TTL<48.65mm; 1.57<Fno<1.63; 20.57°<CRA<25.03°; 2.71mm<BFL<6.91mm; 129°<FOV<141°; 8.48mm<IH<9.26mm.

[0078] In some embodiments, the material of the lens in the optical lens provided by the present application can be glass or plastic. When the material of the lens is plastic, the production cost can be effectively reduced. When the material of the lens is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristics of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0079] 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 a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce the aberration of an optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens of the present application adopt a spherical lens, and the fourth lens adopts an aspherical lens.

[0080] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0081]

[0082] 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 and F are the fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order surface coefficients, respectively.

[0083] The present application is 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 are included in the protection scope of the present application.

[0084] Embodiment 1

[0085] Please refer to Figure 1 , which is a structural schematic diagram of an optical lens 100 provided in the embodiment 1 of the present application. The optical lens 100 includes, in order 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 diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0086] The first lens L1 has a negative focal power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface.

[0087] The second lens L2 has a negative focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface.

[0088] The third lens L3 has a positive focal power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a concave surface.

[0089] The fourth lens L4 has positive focal power, and both the object side S7 and the image side S8 are convex surfaces;

[0090] The fifth lens L5 has positive focal power, and both the object side S9 and the image side are convex surfaces;

[0091] The sixth lens L6 has negative focal power, and the object side is a convex surface, and the image side S11 is a concave surface;

[0092] The fifth lens L5 and the fourth lens L6 form a cemented lens group with negative focal power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens L6 is S10;

[0093] The seventh lens L7 has positive focal power, and the object side S12 is a concave surface, and the image side S13 is a concave surface;

[0094] The object side S14 and the image side S15 of the filter G1 are both flat surfaces;

[0095] The imaging surface S16 is a flat surface.

[0096] The first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are glass spherical lenses, and the fourth lens L4 is a glass aspherical lens.

[0097] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0098] Table 1-1

[0099]

[0100] The surface type parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0101] Table 1-2

[0102] Face number K B C D E F S7 -9.49E-01 4.41E-04 1.85E-05 -3.21E-07 2.02E-08 6.97E-10 S8 -7.81E+39 1.15E-03 -2.18E-05 6.24E-06 -4.37E-07 1.41E-08

[0103] In this embodiment, the MTF curve of the optical lens 100 is shown in Figure 2 .

[0104] Figure 2 The MTF (Modulation Transfer Function) curve of Embodiment 1 is shown, which represents the lens imaging modulation degree of 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. As can be seen from the figure, the MTF value of the present embodiment is above 0.3 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0105] Example 2

[0106] Please see Figure 3 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0107] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0111] Table 2-2

[0112]

[0113]

[0114] In this embodiment, the MTF curve of the optical lens 200 is as follows: Figure 4 As shown.

[0115] from Figure 4 As can be seen, the MTF value of this embodiment is above 0.2 throughout the entire field of view. In the range of 0 to 90 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0116] Example 3

[0117] Please see Figure 5 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0119] Table 3-1

[0120]

[0121] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0122] Table 3-2

[0123]

[0124]

[0125] In the embodiment, the MTF curve of the optical lens 300 is as shown in Figure 6 .

[0126] As can be seen from Figure 6 , the MTF value of the embodiment is above 0.3 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0127] Embodiment 4

[0128] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 400 provided in the embodiment 4 of the application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0129] The related parameters of each lens in the optical lens 400 in the embodiment 4 are as shown in Table 4-1.

[0130] Table 4-1

[0131]

[0132] The surface type parameters of the aspheric lens of the optical lens 400 in the embodiment 4 are as shown in Table 4-2.

[0133] Table 4-2

[0134]

[0135]

[0136] In the embodiment, the MTF curve of the optical lens 400 is as shown in Figure 8 .

[0137] As can be seen from Figure 8 , the MTF value of the embodiment is above 0.2 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0138] Embodiment 5

[0139] Please refer to Figure 9The figure shown is a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0140] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0141] Table 5-1

[0142]

[0143] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0144] Table 5-2

[0145]

[0146]

[0147] In this embodiment, the MTF curve of the optical lens 500 is as follows: Figure 10 As shown.

[0148] from Figure 10 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 90 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, and it has good imaging quality and good detail resolution in both low and high frequency conditions.

[0149] Example 6

[0150] Please see Figure 11 The figure shown is a schematic diagram of the structure of the optical lens 600 provided in Embodiment 6 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0151] The relevant parameters of each lens in the optical lens 600 in Example 6 are shown in Table 6-1.

[0152] Table 6-1

[0153]

[0154] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.

[0155] Table 6-2

[0156]

[0157]

[0158] In the embodiment, the MTF curve of the optical lens 600 is as shown in Figure 12 .

[0159] As can be seen from Figure 12 , the MTF value of the embodiment is above 0.3 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0160] Embodiment 7

[0161] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens 700 provided in the embodiment 7 of the application, and the main difference between the embodiment and the embodiment 1 is that the radius of curvature, lens thickness and other optical parameters of each lens surface are different.

[0162] The related parameters of each lens in the optical lens 700 in the embodiment 7 are as shown in Table 7-1.

[0163] Table 7-1

[0164]

[0165] The surface type parameters of the aspherical lens of the optical lens 700 in the embodiment 7 are as shown in Table 7-2.

[0166] Table 7-2

[0167]

[0168]

[0169] In the embodiment, the MTF curve of the optical lens 700 is as shown in Figure 14 .

[0170] As can be seen from Figure 14 , the MTF value of the embodiment is above 0.5 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0171] Embodiment 8

[0172] Please refer to Figure 15 , which is a structural schematic diagram of the optical lens 800 provided in the embodiment 8 of the application, and the main difference between the embodiment and the embodiment 1 is that the radius of curvature, lens thickness and other optical parameters of each lens surface are different.

[0173] The related parameters of each lens in the optical lens 800 in Embodiment 8 are shown in Table 8-1.

[0174] Table 8-1

[0175]

[0176] The surface type parameters of the aspherical lens of the optical lens 800 in Embodiment 8 are shown in Table 8-2.

[0177] Table 8-2

[0178]

[0179]

[0180] In this embodiment, the MTF curve of the optical lens 800 is shown in Figure 16 .

[0181] As can be seen from Figure 16 , the MTF value of this embodiment is above 0.4 in the full field of view, and in the range of 0-90 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0182] Embodiment 9

[0183] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens 900 provided in Embodiment 9 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0184] The related parameters of each lens in the optical lens 900 in Embodiment 9 are shown in Table 9-1.

[0185] Table 9-1

[0186]

[0187] The surface type parameters of the aspherical lens of the optical lens 900 in Embodiment 9 are shown in Table 9-2.

[0188] Table 9-2

[0189]

[0190]

[0191] In this embodiment, the MTF curve of the optical lens 900 is shown in Figure 18 .

[0192] It can be seen from Figure 18 It can be seen from

[0193] Table 10 shows the optical characteristics of the above-mentioned embodiments, including the effective focal length f, the total track length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view, the maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0194] Table 10

[0195]

[0196]

[0197] Table 10 (continued)

[0198]

[0199]

[0200] In summary, the optical lens provided by the present application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical 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 such as large field of view, large image surface, large aperture, high imaging quality, etc.

[0201] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" 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.

[0202] The above-described embodiments only express several embodiments of the present application, which are described in detail and in detail, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection 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, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging surface along the optical axis, successively comprises: a first lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with negative refractive power; a third lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a fourth lens with positive refractive power, the object side surface of which is convex; a fifth lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a sixth lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a seventh lens with positive refractive power; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2<IH / f<2.4; the object side surface half light entrance radius d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.59<d1 / (IH / 2) / tan(FOV / 2)<1.2; and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.1<f4567 / f<3.

5.

2. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 7.4<TTL / f<11.8; and the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 3.4<TTL / IH<5.

5.

3. The optical lens of claim 1, wherein, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 80°<FOV / Fno<89°; and the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.3<IH / EPD<3.

8.

4. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.04<IH / f<2.33; the object side surface half light entrance radius d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.59<d1 / (IH / 2) / tan(FOV / 2)<1.16; and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.15<f4567 / f<3.

45.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -24<f2 / f<-5; and the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -2.4<f6 / f<-1.

4.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 4.2<f3 / f<7; the object side surface radius of curvature R5 of the third lens and the effective focal length f of the optical lens satisfy: 1.8<R5 / f<3.2; and the image side surface radius of curvature R6 of the third lens and the effective focal length f of the optical lens satisfy: 4<R6 / f<11.

7. The optical lens of claim 1, wherein, An effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: 2.6 < f5 / f < 4.4; a curvature radius R9 of an object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3 < R9 / f < 1.8; a curvature radius R10 of an image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 5 < R10 / f < 53.

8. The optical lens of claim 1, wherein, A curvature radius R3 of an object side surface of the second lens and a curvature radius R4 of an image side surface of the second lens satisfy: 0.5 < R3 / R4 < 3.1; a curvature radius R13 of an object side surface of the seventh lens and a curvature radius R14 of an image side surface of the seventh lens satisfy: 0.2 < R13 / R14 < 19.

9. The optical lens of claim 1, wherein, A curvature radius R5 of an object side surface of the third lens and a curvature radius R6 of an image side surface of the third lens satisfy: -0.57 < (R5-R6) / (R5+R6) < -0.34; a curvature radius R9 of an object side surface of the fifth lens and a curvature radius R10 of an image side surface of the fifth lens satisfy: -0.95 < (R9-R10) / (R9+R10) < -0.

48.

10. The optical lens of claim 1, wherein, A half-field radius d9 of an object side surface of the fifth lens and a sag Sag9 of the half-field radius of the object side surface of the fifth lens satisfy: 0.23 < Sag9 / d9 < 0.33; a half-field radius d10 of an image side surface of the fifth lens and a sag Sag10 of the half-field radius of the image side surface of the fifth lens satisfy: 0 < Sag10 / d10 < 0.09.

Images