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 concave surface, and the image side surface of the first lens is a concave surface; a second lens with negative optical power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is a convex surface, and the image 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 convex surface; a sixth lens with negative optical power, wherein the object side surface of the sixth lens is a concave surface; and a seventh lens with positive optical power; and the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 4.9 < TTL / f < 5.2. The optical lens provided by the application has one or more advantages of miniaturization, large aperture, large image height, large field of view, high pixel, 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] Background description: With the rapid development of the automotive industry, the safety and intelligence level of vehicles are increasingly concerned, and the vehicle-mounted camera, as one of the key sensors of the intelligent driving system of the automobile, is becoming increasingly important. Traditional cars mainly rely on the visual observation of the driver to obtain road condition information, however, the field of vision of the human driver has limitations and is easily affected by factors such as fatigue and distraction, which can lead to traffic accidents. The emergence of vehicle-mounted cameras provides an additional visual perception means for vehicles, which can capture image information of the environment around the vehicle in real time and assist the driver in making more accurate judgments. From the perspective of technological development, early vehicle-mounted cameras were mainly used for simple reversing image functions, with low resolution, poor imaging quality, and single function. With the advancement of image sensor technology, the pixels of vehicle-mounted cameras have been continuously improved, from the initial hundreds of thousands of pixels to the current millions or even tens of millions of pixels, which can provide clearer and more delicate images. At the same time, the field of view of the camera has also gradually increased, from a single rearview camera to front, side, and surround view cameras, providing comprehensive visual data support for the vehicle's automatic driving assistance system.

[0003] The existing vehicle-mounted lens requires the optical lens to have a light, thin, and small shape and to have high pixels and high resolution, and also requires the optical lens to be able 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 excellent imaging quality.

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

[0006] An optical lens, comprising seven lenses, arranged along the optical axis from the object side to the imaging surface in order:

[0007] The first lens has a negative focal length, the object side surface is concave, and the image side surface is concave;

[0008] The second lens has a negative focal length, the object side surface is concave, and the image side surface is convex;

[0009] The third lens has a positive focal length, the object side surface is convex;

[0010] The fourth lens has a positive focal length, the object side surface is convex, and the image side surface is convex;

[0011] the fifth lens with positive refractive power, an object side surface of which is convex, an image side surface of which is convex;

[0012] the sixth lens with negative refractive power, an object side surface of which is concave;

[0013] the seventh lens with positive refractive power;

[0014] wherein an optical total track length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 4.9 < TTL / f < 5.2.

[0015] It is further preferred that a maximum field of view FOV of the optical lens and a chief ray angle of incidence CRA at a maximum image height of the optical lens satisfy: 5 < FOV / CRA < 5.8.

[0016] It is further preferred that a focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.3 < f1 / f < -1.1.

[0017] It is further preferred that a sum ∑CT of central thicknesses of the first lens to the seventh lens along the optical axis and the optical total track length TTL of the optical lens satisfy: 1.6 < TTL / ∑CT < 1.9.

[0018] It is further preferred that a focal length f4 of the fourth lens, a focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 13.4 mm < f4xf5 / f < 15.1 mm.

[0019] It is further preferred that a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: -9 < (R3+R4) / (R3-R4) < -6.5.

[0020] It is further preferred that a focal length f2 of the second lens, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 4 < f2 / (R3+R4) < 15.

[0021] It is further preferred that a half catadioptric semi-diameter CSD71 of the object side end of the seventh lens and a sagittal height SAGX71 of the object side end of the seventh lens satisfy: -11 < CSD71 / SAGX71 < -4.5.

[0022] It is further preferred that an Abbe number Vd1 of the first lens and an Abbe number Vd2 of the second lens satisfy: 60 < Vd1+Vd2 < 115.

[0023] It is further preferred that an image-side end half-aperture sagittal height SAGX12 of the first lens and an object-side end half-aperture sagittal height SAGX21 of the second lens satisfy: -1.6 < SAGX12 / SAGX21 < -1.2.

[0024] The optical lens provided by the 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 miniaturization, large aperture, large image height, high pixel, large field of view, 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 a field curvature curve of the optical lens according to the embodiment of the present application.

[0028] Figure 3 FIG. 3 is an F-Tan(Theta) distortion curve of the optical lens according to the embodiment of the present application.

[0029] Figure 4 FIG. 4 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0030] Figure 5 FIG. 5 is a transverse chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0031] Figure 6 FIG. 6 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0032] Figure 7 FIG. 7 is a field curvature curve of the optical lens according to the embodiment of the present application.

[0033] Figure 8 FIG. 8 is an F-Tan(Theta) distortion curve of the optical lens according to the embodiment of the present application.

[0034] Figure 9 FIG. 9 is an axial aberration curve of the optical lens according to the embodiment of the present application.

[0035] Figure 10 FIG. 10 is a transverse chromatic aberration curve of the optical lens according to the embodiment of the present application.

[0036] Figure 11 FIG. 11 is a structural schematic diagram of an optical lens according to another embodiment of the present application.

[0037] Figure 12 Field curvature curve of the optical lens in embodiment 3 of the present application.

[0038] Figure 13 F-Tan(Theta) distortion curve of the optical lens in embodiment 3 of the present application.

[0039] Figure 14 Axial aberration curve of the optical lens in embodiment 3 of the present application.

[0040] Figure 15 Vignetting curve of the optical lens in embodiment 3 of the present application.

[0041] Figure 16 Structure schematic diagram of the optical lens in embodiment 4 of the present application.

[0042] Figure 17 Field curvature curve of the optical lens in embodiment 4 of the present application.

[0043] Figure 18 F-Tan(Theta) distortion curve of the optical lens in embodiment 4 of the present application.

[0044] Figure 19 Axial aberration curve of the optical lens in embodiment 4 of the present application.

[0045] Figure 20 Vignetting curve of the optical lens in embodiment 4 of the present application.

[0046] Figure 21 Structure schematic diagram of the optical lens in embodiment 5 of the present application.

[0047] Figure 22 Field curvature curve of the optical lens in embodiment 5 of the present application.

[0048] Figure 23 F-Tan(Theta) distortion curve of the optical lens in embodiment 5 of the present application.

[0049] Figure 24 Axial aberration curve of the optical lens in embodiment 5 of the present application.

[0050] Figure 25 Vignetting curve of the optical lens in embodiment 5 of the present application.

[0051] Illustration: the blue line segment in the figure represents wavelength of 0.436um; the green line segment represents wavelength of 0.486um; the red line segment represents wavelength of 0.546um; the yellow line segment represents wavelength of 0.588um; the purple line segment represents wavelength of 0.656um.

[0052] The following detailed description will further describe the present application with reference to the above figures. DETAILED DESCRIPTION

[0053] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the figures. It should be appreciated that these details are just for embodiments of the present application and are not intended to limit the scope of the present application in any manner. Throughout the specification, like drawing reference numerals will be understood to refer to like parts throughout the specification and the figures. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] It should be noted that the expressions first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not 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.

[0055] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0056] 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.

[0057] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, indicate the presence of the 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. Furthermore, when describing the embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the expression "exemplary" is intended to mean an example or an illustration.

[0058] 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 will be further understood that terms, such as those defined in commonly used dictionaries, 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.

[0059] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0060] The optical lens provided by the embodiments of the present application comprises 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.

[0061] In some embodiments, the first lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface. The second lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface. The third lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which can be a concave surface or a convex surface. The fourth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The fifth lens can have a positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface. The sixth lens can have a negative focal power, the object side surface of which is a concave surface, and the image side surface of which can be a concave surface or a convex surface. The seventh lens can have a positive focal power, the object side surface of which can be a concave surface or a convex surface, and the image side surface of which can be a concave surface or a convex surface.

[0062] In some embodiments, the optical lens can further comprise 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 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 correction of the diaphragm aberration is facilitated.

[0063] In some embodiments, the optical lens can further comprise a filter, which can be arranged 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.

[0064] In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.9 < TTL / f < 5.2. Satisfying the above condition formula, the ratio of the optical total length and the effective focal length of the optical lens can be reasonably configured, so that the lens has a large image surface and can realize high-pixel imaging, thereby improving the resolution and the receiving field of view range of the lens; and the miniaturization design of the optical lens can also be realized, thereby making the optical lens smaller in size and lighter in weight.

[0065] In some embodiments, the maximum field of view angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 5 < FOV / CRA < 5.8. Satisfying the above condition formula, the ratio of the maximum field of view angle and the maximum chief ray angle of incidence of the optical lens can be reasonably configured, which is beneficial to the optical lens to meet certain wide-angle characteristics and realize large-range shooting requirements; at the same time, it is also beneficial to reduce the chief ray angle of incidence on the imaging surface, so that the optical lens is more easily matched with the photosensitive element, thereby improving the photosensitive performance and further improving the relative luminance of the optical lens.

[0066] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.3 < f1 / f < -1.1. Satisfying the above condition formula, the first lens of the optical lens is set as a negative focal length lens, which can capture light rays with a large angle entering the optical lens, thereby expanding the field of view angle range of the optical lens; at the same time, it is also beneficial to reduce the sensitivity of the optical lens and realize the miniaturization design of the optical lens.

[0067] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the optical total length TTL of the optical lens satisfy: 1.6 < TTL / ∑CT < 1.9. Satisfying the above condition formula, the optical total length of the optical lens and the sum of the thicknesses of the lenses are reasonably configured, which is helpful to realize high-pixel characteristics and improve the imaging quality of the optical lens; at the same time, the optical total length of the optical lens can be effectively shortened to meet the miniaturization and light weight design requirements.

[0068] In some embodiments, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 13.4 mm < f4 x f5 / f < 15.1 mm. Satisfying the above condition, it is beneficial to correct the aberration of the light rays turned by the front lens and control the angle of the light rays turned by the lens group and then emitted into the imaging system, thereby improving the high-quality imaging picture of the imaging system.

[0069] In some embodiments, the second lens satisfies the following condition: -9 < (R3+R4) / (R3-R4) < -6.5, where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. The above condition can effectively correct the edge field aberration of the optical lens, inhibit the generation of astigmatism, and reduce the angle of the chief ray of the peripheral view angle incident to the image plane of the optical lens, thereby improving the imaging quality of the optical lens.

[0070] In some embodiments, the second lens satisfies the following condition: 4 < f2 / (R3+R4) < 15, where f2 is the focal length of the second lens, R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. The above condition can constrain the surface shape of the object side surface and the image side surface of the second lens, thereby reducing the bending degree of the light rays at the image side surface of the second lens, reducing the astigmatism of the optical lens, balancing the astigmatism problem caused by the large field angle of the optical lens, and ensuring that the optical lens has excellent imaging quality while having a large field angle.

[0071] In some embodiments, the seventh lens satisfies the following condition: -11 < CSD71 / SAGX71 < -4.5, where CSD71 is the half entrance pupil radius of the object side end of the seventh lens, and SAGX71 is the sag of the object side end of the seventh lens. The above condition can control the opening angle of the object side surface of the seventh lens to be small, thereby facilitating smooth transition of the light rays and reducing the sensitivity of the optical lens.

[0072] In some embodiments, the first lens and the second lens satisfy the following condition: 60 < Vd1+Vd2 < 115, where Vd1 is the Abbe number of the first lens, and Vd2 is the Abbe number of the second lens. The above condition can improve the chromatic aberration correction effect of the first lens and the second lens, and can also distribute the chromatic aberration correction effect of the first lens and the second lens at the front end of the optical lens, thereby improving the dispersion correction capability of the optical lens and improving the imaging quality of the optical lens.

[0073] In some embodiments, the first lens and the second lens satisfy the following condition: -1.6 < SAGX12 / SAGX21 < -1.2, where SAGX12 is the sag of the image side end of the first lens, and SAGX21 is the sag of the object side end of the second lens. The above condition can reasonably control the ratio of the sag of the maximum half entrance pupil radius of the image side end of the first lens to the sag of the maximum half entrance pupil radius of the object side end of the second lens, thereby controlling the surface shape of the image side surface of the first lens and the object side surface of the second lens, and reducing the risk of ghost image.

[0074] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3.4 < IH / EPD < 3.6. By satisfying the above conditional formula, an optical lens with a large image plane can have a relatively large entrance pupil diameter and a relatively high light passing amount, thereby increasing the imaging effect when the optical lens operates in a dark environment, and reducing the aberration of the edge field of view.

[0075] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -42 < f2 / f < -12. By satisfying the above conditions, the second lens can have an appropriate negative optical power, enabling the light rays to transition smoothly, and allowing the light rays to be lifted upward and then enter the subsequent lens smoothly, which is beneficial for achieving a large image height.

[0076] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.2 < f5 / f < 1.6. By satisfying the above conditions, the fifth lens can have an appropriate positive optical power, which is beneficial for balancing various aberrations generated by the lens, improving the imaging quality of the lens, and at the same time increasing the imaging area of the lens and improving the imaging quality.

[0077] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.9 < (R1 + R2) / (R1 - R2) < 1. By satisfying the above conditional formula, by reasonably limiting the curvature radii of the object side surface and the image side surface of the first lens, the distortion generated by the first lens can be reduced, the difficulty of distortion correction for the subsequent lenses can be reduced, and it is helpful to improve the imaging quality; at the same time, it can ensure that the first lens converges more incident light rays and improve the imaging brightness of the optical lens.

[0078] In some embodiments, the central thickness CT2 of the second lens and the edge thickness ET2 of the second lens satisfy: 0.95 < CT2 / ET2 < 1.1. By satisfying the above conditional formula, by controlling the central thickness and the edge thickness of the second lens within a certain range, the aberrations generated by the optical lens can also be effectively balanced, and it is also beneficial for the field curvature adjustment in engineering production, which is beneficial for improving the imaging quality of the optical lens.

[0079] In some embodiments, the optical lens satisfies the following conditional expressions: 26.5mm < TTL < 27.5mm; Fno < 2; 9.5mm < IH ≤ 10mm; 5.2mm < f < 5.5mm; FOV = 120°. In the above conditional expressions, 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 angle of the optical lens, f represents the effective focal length of the optical lens, and FOV represents the maximum field angle of the optical lens. The optical lens satisfies the above conditional expressions, and has at least one or more advantages of miniaturization, large aperture, large image height, long focal length, and large field angle.

[0080] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic 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.

[0081] 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 the 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 fourth lens, the fifth lens, and the sixth lens of the present application adopt a spherical lens, and the third lens and the seventh lens adopt an aspherical lens.

[0082] 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:

[0083]

[0084] 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.

[0085] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0086] Embodiment 1

[0087] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface, 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.

[0088] The first lens L1 has negative focal power, the object side surface S1 is a concave surface, and the image side surface S2 is a concave surface.

[0089] The second lens L2 has negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.

[0090] The third lens L3 has positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.

[0091] The fourth lens L4 has positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface.

[0092] The fifth lens L5 has positive focal power, the object side surface S9 is a convex surface, and the image side surface is a convex surface.

[0093] The sixth lens L6 has negative focal power, the object side surface is a concave surface, and the image side surface S11 is a convex surface.

[0094] The fifth lens L5 and the sixth lens L6 form a cemented lens group with negative focal power, that is, the cemented surface of the image side surface of the fifth lens L5 and the object side surface of the sixth lens is S10.

[0095] The seventh lens L7 has positive focal power, the object side surface S12 is a convex surface at the near optical axis, and the image side surface S13 is a concave surface at the near optical axis.

[0096] The object side surface S14 and the image side surface S15 of the filter G1 are both flat surfaces.

[0097] The imaging surface S16 is a flat surface.

[0098] The third lens L3 and the seventh lens L7 are glass aspherical lenses; and the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are glass spherical lenses.

[0099] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0100] Table 1-1

[0101]

[0102] The surface type parameters of the aspherical lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0103] Table 1-2

[0104] Surface Number K B C D E F S5 1.31E+00 -2.80E-04 -1.14E-05 4.68E-07 -2.62E-08 7.47E-10 S6 -2.00E+02 -2.00E-04 -1.16E-05 7.65E-07 -3.66E-08 9.05E-10 S12 -9.40E+01 -2.34E-03 -5.90E-05 -1.32E-06 9.74E-08 2.60E-09 S13 9.20E+00 -2.67E-03 -1.27E-05 1.48E-06 -2.47E-08 5.58E-10

[0105] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 The blue line segment in each curve represents a wavelength of 0.436um; the green line segment represents a wavelength of 0.486um; the red line segment represents a wavelength of 0.546um; the yellow line segment represents a wavelength of 0.588um; and the purple line segment represents a wavelength of 0.656um.

[0106] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the field curvature of the optical lens in the range from a wavelength of 0.436um to a wavelength of 0.656um, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °); wherein the solid line represents the field curvature in the meridional image plane, and the dashed line represents the field curvature in the sagittal image plane. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04mm, which indicates that the optical lens 100 can correct the field curvature well.

[0107] Figure 3 The F-Tan(Theta) distortion curve of Embodiment 1 is shown, which represents the F-Tan(Theta) distortion of the optical lens at a wavelength of 0.656um, specifically the F-Tan(Theta) distortion at different image heights on the imaging surface, the horizontal axis represents the F-Tan(Theta) distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tan(Theta) distortion of the optical lens is controlled within -50%~0, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.

[0108] Figure 4 The axial aberration curve of the optical lens 100 in this embodiment is shown, which represents the axial aberration of the optical lens in the wavelength range of 0.436um to 0.656um, 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 figure, the shift of the axial aberration is controlled within ±0.03mm, which shows that the optical lens 100 can better correct the axial aberration.

[0109] Figure 5 The curve of the optical lens 100 in this embodiment is shown, which represents the color difference of the optical lens at different image heights on the imaging surface in the wavelength range of 0.436um to 0.656um, the horizontal axis represents the color difference value of each wavelength (unit: μm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the axial aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, which shows that the optical lens 100 can better correct the color difference.

[0110] Embodiment 2

[0111] 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 image side S6 of the third lens L3 is a concave surface; the image side S13 of the seventh lens L7 is a convex surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0112] The related parameters of each lens in the optical lens 200 in embodiment 2 are shown in table 2-1.

[0113] Table 2-1

[0114]

[0115]

[0116] The surface type parameters of the aspherical lens of the optical lens 200 in embodiment 2 are shown in table 2-2.

[0117] Table 2-2

[0118] Surface Number K B C D E F S5 1.40E+00 -2.02E-04 -6.20E-06 2.73E-07 -1.57E-08 2.92E-10 S6 1.21E+00 2.33E-04 -7.85E-07 1.15E-06 -7.87E-08 2.76E-09 S12 1.97E+02 -3.45E-03 -4.59E-05 -1.84E-06 -1.85E-07 2.61E-08 S13 8.52E+01 -2.46E-03 1.21E-06 8.61E-07 -1.60E-08 1.25E-09

[0119] In this embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve and the axial aberration curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 .

[0120] FromFigure 7 As can be seen from

[0121] From Figure 8 As can be seen from

[0122] From Figure 9 As can be seen from

[0123] From Figure 10 As can be seen from

[0124] Embodiment 3

[0125] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference is that the image side surface S6 of the third lens L3 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0126] The related parameters of each lens in the optical lens 300 in the embodiment 3 are shown in Table 3-1.

[0127] Table 3-1

[0128]

[0129] The surface type parameters of the aspheric lens of the optical lens 300 in the embodiment 3 are shown in Table 3-2.

[0130] Table 3-2

[0131] Surface Number K B C D E F S5 1.18E+00 -3.08E-04 -1.21E-05 2.14E-07 -1.87E-08 2.81E-10 S6 -1.13E+01 1.82E-04 -1.14E-05 9.71E-07 -5.46E-08 1.86E-09 S12 1.05E+02 -2.93E-03 -7.99E-06 -1.99E-06 -3.34E-08 7.21E-09 S13 7.64E+01 -2.51E-03 6.83E-06 1.96E-07 -1.86E-09 3.52E-10

[0132] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 300 are respectively shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 .

[0133] As can be seen from Figure 12 As can be seen from the above, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.04mm, which indicates that the optical lens 300 can correct the field curvature well.

[0134] As can be seen from Figure 13 , the F-Tan(Theta) distortion of the optical lens 300 is controlled within-50%~0, the image compression in the edge angle area is relatively gentle, and the definition of the expanded image is effectively improved.

[0135] As can be seen from Figure 14 , the shift amount of the axial aberration is controlled within ±0.03mm, which indicates that the optical lens 300 can better correct the axial aberration.

[0136] As can be seen from Figure 15 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±5μm, which indicates that the optical lens 300 can better correct the chromatic aberration.

[0137] Embodiment 4

[0138] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens 400 provided in the embodiment 4 of the present application. Compared with the embodiment 1, the main difference is that the image side S6 of the third lens L3 is a concave surface; the image side S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0139] The related parameters of each lens in the optical lens 400 in the embodiment 4 are shown in Table 4.

[0140] Table 4-1

[0141]

[0142] The surface type parameters of the aspherical lens of the optical lens 400 in the embodiment 4 are shown in Table 4-2.

[0143] Table 4-2

[0144] Surface Number K B C D E F S5 9.18E-01 -3.23E-04 -1.24E-05 3.24E-07 -2.44E-08 4.21E-10 S6 -1.74E+01 1.94E-04 -1.10E-05 1.06E-06 -6.22E-08 1.92E-09 S12 -1.97E+02 -2.82E-03 -2.81E-05 -2.90E-06 -7.97E-09 1.38E-08 S13 5.22E+01 -2.87E-03 7.02E-06 -1.58E-09 1.42E-08 8.20E-10

[0145] In the present embodiment, the field curvature curve, the F-Tan(Theta) distortion curve, the axial aberration curve and the transverse chromatic aberration curve of the optical lens 400 are respectively shown in Figure 17 , Figure 18 , Figure 19 , Figure 20 .

[0146] As can be seen from Figure 17 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.04mm, which indicates that the optical lens 400 can better correct the field curvature.

[0147] As can be seen from Figure 18As can be seen, the F-Tan (Theta) distortion of the optical lens 400 is controlled within -50% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0148] from Figure 19 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens 400 can effectively correct axial aberration.

[0149] from Figure 20 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±4μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0150] Example 5

[0151] Please see Figure 21 The 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 image-side surface S6 of the third lens L3 is concave; the object-side surface S12 of the seventh lens L7 is concave; the image-side surface S13 of the seventh lens L7 is convex; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0152] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5.

[0153] Table 5-1

[0154]

[0155]

[0156] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0157] Table 5-2

[0158] Surface Number K B C D E F S5 1.10E+00 -3.04E-04 -1.43E-05 2.16E-07 -1.81E-08 2.51E-10 S6 -1.32E+01 2.19E-04 -1.27E-05 9.40E-07 -4.72E-08 1.41E-09 S12 -1.72E+02 -3.44E-03 -3.67E-05 -2.83E-06 -1.93E-09 1.21E-08 S13 1.50E+02 -2.79E-03 2.41E-06 2.55E-07 1.36E-08 5.98E-10

[0159] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 500 are respectively as follows: Figure 22 , Figure 23 , Figure 24 , Figure 25 As shown.

[0160] from Figure 22 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, indicating that the optical lens 500 can correct the field curvature well.

[0161] from Figure 23It can be seen from the above table 5 that the F-Tan(Theta) distortion of the optical lens 500 is controlled within-50%~0, the image compression in the edge angle region is relatively gentle, and the definition of the expanded image is effectively improved.

[0162] From the above table 5, it can be seen that the axial aberration offset is controlled within ±0.02mm, which shows that the optical lens 500 can better correct the axial aberration. Figure 24

[0163] From the above table 5, it can be seen that the axial aberration offset is controlled within ±0.02mm, which shows that the optical lens 500 can better correct the axial aberration. Figure 25

[0164] Please refer to table 6, the optical characteristics corresponding to the above-mentioned 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 maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0165] Table 6

[0166] Parameter and Condition Example 1 Example 2 Example 3 Example 4 Example 5 f (mm) 5.22 5.21 5.45 5.32 5.38 EPD (mm) 2.75 2.74 2.87 2.80 2.83 TTL (mm) 27.00 27.00 27.00 27.00 27.01 Fno 1.90 1.90 1.90 1.90 1.90 CRA (°) 20.95 21.94 21.23 23.89 21.47 FOV (°) 120.00 120.00 120.00 120.00 120.00 IH (mm) 9.60 9.60 10.00 10.00 10.00 TTL / f 5.17 5.19 4.95 5.07 5.02 IH / EPD 3.49 3.50 3.49 3.57 3.53 FOV / CRA 5.73 5.47 5.65 5.02 5.59 f1 / f -1.22 -1.11 -1.18 -1.23 -1.21 TTL / ∑CT 1.83 1.66 1.78 1.75 1.74 f2 / f -12.48 -33.54 -19.48 -40.79 -21.74 f4 x f5 / f (mm) 13.44 14.07 14.23 15.08 14.01 f5 / f 1.29 1.33 1.45 1.50 1.43 (R1+R2) / (R1-R2) 0.99 0.95 0.96 0.96 0.94 (R3+R4) / (R3-R4) -6.77 -8.99 -7.15 -8.81 -6.94 f2 / (R3+R4) 4.34 11.95 6.73 14.54 7.51 CT2 / ET2 1.00 1.06 0.98 1.02 0.99 CSD71 / SAGX71 -10.14 -6.44 -8.07 -8.04 -4.91 Vd1+Vd2 81.82 60.71 113.59 113.59 113.59 SAGX12 / SAGX21 -1.346 -1.276 -1.549 -1.463 -1.505

[0167] In summary of the above embodiments, the optical lens provided by the present application adopts seven lenses with specific optical power, 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 of miniaturization, large aperture, large image height, high pixel, large field of view, high imaging quality, etc.

[0168] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present 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.

[0169] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons 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 present patent should be subject to the appended claims.​​

Claims

1. An optical lens comprising seven lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a concave object side and a concave image side. A second lens with negative optical power has a concave object side and a convex image side. A third lens with positive optical power has a convex object-side surface; The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface. The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface. The sixth lens has negative optical power and its object side is concave. A seventh lens with positive optical power; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 4.9 <TTL / f<5.2; The maximum field of view (FOV) of the optical lens and the principal ray incident angle (CRA) at the maximum image height of the optical lens satisfy: 5 <FOV / CRA<5.8。 2. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -42 <f2 / f<-12。 3. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.3 <f1 / f<-1.1。 4. The optical lens according to claim 1, characterized in that, The sum of the center thicknesses along the optical axis of the first lens to the seventh lens, ∑CT, satisfies the following condition: 1.6 <TTL / ∑CT<1.9。 5. The optical lens according to claim 1, characterized in that, The focal length f4 of the fourth lens, the focal length f5 of the fifth lens, and the effective focal length f of the optical lens satisfy the following condition: 13.4mm. <f4×f5 / f<15.1mm。 6. The optical lens according to claim 1, characterized in that, The object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: -9<(R3+R4) / (R3-R4)<-6.

5.

7. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens, the radius of curvature R3 of the object side of the second lens, and the radius of curvature R4 of the image side of the second lens satisfy: 4 <f2 / (R3+R4)<15。 8. The optical lens according to claim 1, characterized in that, The object-side half-aperture CSD71 of the seventh lens and the object-side half-aperture sagitta SAGX71 of the seventh lens satisfy: -11 <CSD71 / SAGX71<-4.5。 9. The optical lens according to claim 1, characterized in that, The Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens satisfy: 60 <Vd1+Vd2<115。 10. The optical lens according to claim 1, characterized in that, The image-side half-aperture sagitta SAGX12 of the first lens and the object-side half-aperture sagitta SAGX21 of the second lens satisfy: -1.6 <SAGX12 / SAGX21<-1.2。

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