Optical lens

Abstract

This invention provides an optical lens comprising seven lenses, characterized in that, along the optical axis from the object side to the imaging plane, the lenses are arranged as follows: a first lens with negative optical power, whose object side and image side are both concave; a second lens with positive optical power, whose object side is convex and image side is concave; a third lens with positive optical power, whose object side and image side are both convex; a fourth lens with negative optical power, whose object side is concave and image side is convex; a fifth lens with negative optical power, whose object side is concave and image side is convex; a sixth lens with positive optical power, whose object side and image side are both convex; and a seventh lens with negative optical power, whose object side and image side are both concave. The maximum field of view (FOV) of the optical lens, the true image height (IH) corresponding to the maximum field of view, and the aperture (D1) of the object side of the first lens satisfy the following condition: 1.2 < D1 / IH / Tan(FOV / 2) < 1.5.

Description

TECHNICAL FIELD

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

[0002] With the development of automobile intelligence, the driving assistance function of vehicles is gradually enhanced, and the visual information collection is the core tool. With the improvement of the level of automatic driving, the requirements for vehicle-mounted cameras are also gradually improved, especially for front cameras. The front camera can enhance the active safety and driver assistance function, such as automatic emergency braking (AEB), adaptive cruise control (ACC), lane keeping assistance system (LKAS) and traffic jam assistance (TJA), etc. The front camera has the advantages of high resolution, large field of view, good environmental adaptability, etc., but also has the disadvantages of too many lenses and too long total optical length, which is not conducive to the miniaturization of electronic systems. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens which can solve one or more of the above problems.

[0004] To achieve the above purpose, the technical scheme of the present application is as follows:

[0005] An optical lens, which has seven lenses, characterized in that, along the optical axis from the object side to the imaging surface, they are in order:

[0006] The first lens has negative focal power, and both the object side surface and the image side surface are concave;

[0007] The second lens has positive focal power, and the object side surface is convex and the image side surface is concave;

[0008] The third lens has positive focal power, and both the object side surface and the image side surface are convex;

[0009] The fourth lens has negative focal power, and the object side surface is concave and the image side surface is convex;

[0010] The fifth lens has negative focal power, and the object side surface is concave and the image side surface is convex;

[0011] The sixth lens has positive focal power, and both the object side surface and the image side surface are convex;

[0012] The seventh lens has negative focal power, and both the object side surface and the image side surface are concave;

[0013] The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the first lens object side surface aperture D1 satisfy: 1.2 < D1 / IH / Tan(FOV / 2) < 1.5.

[0014] Preferably, the optical total track length TTL and the effective focal length f of the optical lens satisfy: 5.0 < TTL / f < 5.8.

[0015] Preferably, the effective focal length f and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.4 < IH / f < 1.7.

[0016] Preferably, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: 0.3 < BFL / f < 0.5.

[0017] Preferably, the effective focal length f, the maximum field of view angle FOV and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.7 < (IH / 2) / (f x Tan(FOV / 2)) < 0.8.

[0018] Preferably, the effective focal length f and the focal length f1 of the first lens satisfy: -1.6 < f1 / f < 0.

[0019] Preferably, the effective focal length f5 and the object side curvature radius R9 and the image side curvature radius R 10 of the fifth lens satisfy: 0.3 < R9 / f5 < 0.7; 0.9 < R 10 / f5 < 3.5, respectively.

[0020] Preferably, the sagittal height Sag 14 of the image side half light aperture of the seventh lens and the half light aperture d 14 satisfy: 0.28 < Sag 14 / d 14 < 0.36.

[0021] Preferably, the effective focal length f and the focal length f7 of the seventh lens satisfy: -2.5 < f7 / f < 0.

[0022] Preferably, the optical total track length TTL and the sum of the central thicknesses of the first lens to the seventh lens along the optical axis ∑CT satisfy: 0.5 < ∑CT / TTL < 0.7.

[0023] Compared with the prior art, the present application has the beneficial effects that: through reasonable collocation of the lens shape and the optical power combination between each lens, the effects of high definition, large aperture and miniaturization are realized.

[0024] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 1 A structural schematic diagram of an optical lens of the present application embodiment 1.

[0027] Figure 2 A field curvature curve diagram of the optical lens in the present application embodiment 1.

[0028] Figure 3 An F-Tanθ distortion curve diagram of the optical lens in the present application embodiment 1.

[0029] Figure 4 A relative luminance curve diagram of the optical lens in the present application embodiment 1.

[0030] Figure 5 An MTF curve diagram of the optical lens in the present application embodiment 1.

[0031] Figure 6 An axial aberration curve diagram of the optical lens in the present application embodiment 1.

[0032] Figure 7 A transverse chromatic aberration curve diagram of the optical lens in the present application embodiment 1.

[0033] Figure 8 A structural schematic diagram of an optical lens of the present application embodiment 2.

[0034] Figure 9 A field curvature curve diagram of the optical lens in the present application embodiment 2.

[0035] Figure 10 An F-Tanθ distortion curve diagram of the optical lens in the present application embodiment 2.

[0036] Figure 11 A relative luminance curve diagram of the optical lens in the present application embodiment 2.

[0037] Figure 12 An MTF curve diagram of the optical lens in the present application embodiment 2.

[0038] Figure 13 An axial aberration curve diagram of the optical lens in the present application embodiment 2.

[0039] Figure 14 A transverse chromatic aberration curve diagram of the optical lens in the present application embodiment 2.

[0040] Figure 15 A structural schematic diagram of an optical lens of the present application embodiment 3.

[0041] Figure 16A field curvature curve of the optical lens in Embodiment 3 of the present application.

[0042] Figure 17 An F-Tanθ distortion curve of the optical lens in Embodiment 3 of the present application.

[0043] Figure 18 A relative illumination curve of the optical lens in Embodiment 3 of the present application.

[0044] Figure 19 An MTF curve of the optical lens in Embodiment 3 of the present application.

[0045] Figure 20 An axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0046] Figure 21 A transverse chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0047] Figure 22 A structure diagram of the optical lens in Embodiment 4 of the present application.

[0048] Figure 23 A field curvature curve of the optical lens in Embodiment 4 of the present application.

[0049] Figure 24 An F-Tanθ distortion curve of the optical lens in Embodiment 4 of the present application.

[0050] Figure 25 A relative illumination curve of the optical lens in Embodiment 4 of the present application.

[0051] Figure 26 An MTF curve of the optical lens in Embodiment 4 of the present application.

[0052] Figure 27 An axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0053] Figure 28 A transverse chromatic aberration curve of the optical lens in Embodiment 4 of the present application. DETAILED DESCRIPTION

[0054] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0055] It should be noted that the terms first, second, third, etc. in the present specification are only used to distinguish one feature from another, 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.

[0056] 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 strictly to scale.

[0057] In this context, 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.

[0058] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify 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 expressions such as "at least one of" appear after a list of one or more items, the phrase "at least one of" modifies the entire list of items and does not modify the list of items individually. Furthermore, when describing embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0059] 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.

[0060] 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 embodiments.

[0061] The optical lens according to the embodiments of the present application sequentially comprises, from the object side to the image side: a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and a filter and a protective glass.

[0062] In some embodiments, the first lens can have a negative focal power, which is conducive to reducing the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side and the image side of the first lens are both concave, which can reduce the effective working aperture of the first lens, while avoiding the excessive divergence of the light, which leads to the large aperture of the lens behind the optical lens; it can also reduce the coma generated by the first lens itself, and improve the imaging quality of the optical lens.

[0063] In some embodiments, the second lens can have a positive focal power, which is conducive to converging the light while reducing the deflection angle of the light, making the light transition smoothly. The object side of the second lens is convex, and the image side is concave, which can not only reduce the influence of the field curvature generated by the second lens itself on the optical lens, but also reduce the ghost energy of the light reflected by the object side of the second lens, thereby improving the imaging quality of the optical lens.

[0064] In some embodiments, the third lens can have a positive focal power, which is conducive to converging the light while reducing the deflection angle of the light, making the light transition smoothly. The object side and the image side of the third lens are both convex, which can not only reduce the influence of the spherical aberration generated by the third lens itself on the optical lens, but also effectively avoid the excessive deflection angle of the edge field light during the transmission of the light from the second lens to the third lens, thereby improving the imaging quality of the optical lens.

[0065] In some embodiments, the fourth lens can have a negative focal power, which is conducive to correcting the chromatic aberration of the optical lens and improving the imaging quality of the optical lens. The object side of the fourth lens is concave, and the image side is convex, which can not only reduce the influence of the field curvature generated by the fourth lens itself on the optical lens, but also reduce the deflection angle of the light emitted from the object side of the fourth lens, thereby reducing the correction difficulty of the axial aberration and improving the imaging quality of the optical lens.

[0066] In some embodiments, the fifth lens can have a negative focal power, which is conducive to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The object side of the fifth lens is concave, and the image side is convex, which can not only converge the edge field light, but also make the converged light smoothly enter the rear optical system, and also reduce the field curvature generated by the fifth lens itself, thereby improving the imaging quality of the optical lens.

[0067] In some embodiments, the sixth lens can have a positive focal power, which is conducive to converging the light while reducing the deflection angle of the light, making the light transition smoothly. The object side and the image side of the sixth lens are both convex, which can not only reduce the influence of the spherical aberration generated by the sixth lens itself on the optical lens, but also correct various aberrations of the optical lens, thereby improving the imaging quality of the optical lens.

[0068] In some embodiments, the seventh lens can have a negative refractive power, which is beneficial to increase the imaging area of the optical lens, correct the chromatic aberration of the optical lens, and improve the imaging quality of the optical lens. The object side surface and the image side surface of the seventh lens are both concave, which is beneficial to converge the light rays in the edge field of view, suppress the angle of incidence of the light rays in the edge field of view on the imaging surface, effectively transfer more light beams to the imaging surface, improve the relative luminance of the edge field of view, avoid the generation of dark corners, and improve the imaging quality of the optical lens.

[0069] In some embodiments, the third lens and the fourth lens can be bonded to form a bonded 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, improve the imaging quality of the optical lens, reduce the assembly sensitivity of the optical lens, and further reduce the processing difficulty of the optical lens and improve the assembly yield of the optical lens.

[0070] In some embodiments, a diaphragm for limiting light beams can be arranged between the first lens and the second lens, and the diaphragm can be arranged near the object side surface of the second lens, which can not only reduce the generation of ghost images of the optical lens, but also converge the range of the light rays emitted from the front end of the optical lens and reduce the rear end aperture of the optical lens.

[0071] In some embodiments, the F number FNO of the optical lens satisfies FNO≤1.60. Satisfying the above range is beneficial to achieve a large aperture characteristic, and the clear image can be ensured in a weak light environment or at night.

[0072] In some embodiments, the maximum field of view FOV of the optical lens satisfies 90°≤FOV. Satisfying the above range is beneficial to achieve a wide-angle characteristic, so that more scene information can be obtained to meet the demand for large-range detection.

[0073] In some embodiments, the maximum field of view chief ray angle CRA of the optical lens on the image surface satisfies 18°<CRA<24°. Satisfying the above range can make the CRA of the optical lens have an appropriate allowable error range with the CRA of the photosensitive element of the chip, and improve the adaptation ability of the optical lens to the image sensor.

[0074] In some embodiments, the total track length TTL of the optical lens and the effective focal length f satisfy 5.0<TTL / f<5.8. Satisfying the above range can effectively limit the length of the lens and achieve miniaturization of the optical lens.

[0075] In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy 1.4<IH / f<1.7. Satisfying the above range can achieve a wide-angle characteristic to meet the demand for large-range shooting, and achieve a large image surface characteristic to improve the imaging quality of the optical lens.

[0076] In some embodiments, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: 0.3 < BFL / f < 0.5. Satisfying the above range, a balance between good imaging quality and easy-to-assemble optical back focal length is achieved, which ensures the imaging quality of the optical lens while reducing the total length of the optical lens.

[0077] In some embodiments, the effective focal length f, the maximum field of view FOV and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.7 < (IH / 2) / (f x Tan(FOV / 2)) < 0.8. Satisfying the above range, the distortion of the optical lens can be controlled within a reasonable range, which is convenient for later restoration by software algorithm.

[0078] In some embodiments, the effective focal length f and the focal length f1 of the first lens of the optical lens satisfy: -1.6 < f1 / f < 0. Satisfying the above range, the first lens can have appropriate negative refractive power, which is beneficial to the moderate change of the incident light refraction angle, avoids excessive refraction change to generate too much aberration, and helps more light enter the rear optical system to increase the illumination and improve the imaging quality of the optical lens.

[0079] In some embodiments, the effective focal length f and the focal length f2 of the second lens of the optical lens satisfy: 0 < f2 / f < 4.0. Satisfying the above range, the second lens can have appropriate positive refractive power, which is beneficial to converging light while reducing the light deflection angle, allowing the light to transition smoothly, and improving the imaging quality of the optical lens.

[0080] In some embodiments, the effective focal length f and the focal length f3 of the third lens of the optical lens satisfy: 0 < f3 / f < 1.0. Satisfying the above range, the third lens can have appropriate positive refractive power, which is beneficial to converging light while reducing the light deflection angle, allowing the light to transition smoothly, and improving the imaging quality of the optical lens.

[0081] In some embodiments, the effective focal length f and the focal length f4 of the fourth lens of the optical lens satisfy: -1.8 < f4 / f < 0. Satisfying the above range, the fourth lens can have appropriate negative refractive power, which is beneficial to balance the spherical aberration of the third lens, correct the chromatic aberration of the optical lens, and improve the imaging quality of the optical lens.

[0082] In some embodiments, the effective focal length f and the focal length f5 of the fifth lens of the optical lens satisfy: -2.5 < f5 / f < 0. Satisfying the above range, the fifth lens can have appropriate negative refractive power, which is beneficial to increase the imaging area of the optical lens and improve the imaging quality of the optical lens.

[0083] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy the condition: 0 < f6 / f < 1.5. Satisfying this range allows the sixth lens to have appropriate positive optical power, which is beneficial for converging light while reducing the light deflection angle, allowing the light path to transition smoothly, and improving the imaging quality of the optical lens.

[0084] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy the condition: -2.5 < f7 / f < 0. Satisfying this range allows the seventh lens to have appropriate negative optical power, which is beneficial for increasing the imaging area of ​​the optical lens and improving its imaging quality.

[0085] In some embodiments, the effective focal length f5 of the fifth lens is related to the object-side radius of curvature R9 and the image-side radius of curvature R of the fifth lens. 10 They respectively satisfy: 0.3 < R9 / f5 < 0.7; 0.9 < R 10 f5 < 3.5. Meeting the above range is beneficial for correcting various aberrations of optical lenses and improving the image quality of optical lenses.

[0086] In some embodiments, the sagitta of the half-aperture of the image side of the seventh lens is Sag 14 With light transmission half-aperture d 14 Satisfies: 0.28 < Sag 14 / d 14 <0.36. Meeting the above range can effectively constrain the surface shape of the off-axis field of view on the side of the fourth lens, control the incident angle when light is incident on the imaging plane, and thus ensure that more light is transmitted to the imaging plane.

[0087] In some embodiments, the maximum field of view (FOV) of the optical lens, the true image height (IH) corresponding to the maximum field of view, and the aperture D1 of the object side of the first lens satisfy the following: 1.2 < D1 / IH / Tan(FOV / 2) < 1.5. Satisfying the above range allows the optical lens to have a large field of view and a large image plane while maintaining a small front aperture, which is beneficial for the miniaturization of the optical lens.

[0088] In some embodiments, the total optical length TTL of the optical lens and the sum of the center thicknesses of the first to seventh lenses along the optical axis, ∑CT, satisfy the condition: 0.5 < ∑CT / TTL < 0.7. Satisfying this range can effectively compress the total length of the optical lens, while also benefiting the structural design and manufacturing process of the optical lens.

[0089] To achieve better optical performance, the lens employs multiple aspherical lenses, and the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0090]

[0091] wherein z is the distance of the curved surface to the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadratic curved surface, and A, B, C, D, E, and F are the coefficients of the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order curved surfaces, respectively.

[0092] The application will be further described in the following embodiments. In each embodiment, 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 merely the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, and any change, replacement, combination, or simplification made without departing from the innovative points of the application should be regarded as equivalent replacement, and should be included in the protection scope of the application.

[0093] Embodiment 1

[0094] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in the embodiment 1 of the application. The optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0095] The first lens L1 has a negative focal power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces;

[0096] The stop ST;

[0097] The second lens L2 has a positive focal power, the object side S3 of the second lens L2 is a convex surface, and the image side S4 is a concave surface;

[0098] The third lens L3 has a positive focal power, and the object side S5 and the image side S6 of the third lens L3 are both convex surfaces;

[0099] The fourth lens L4 has a negative focal power, the object side S7 of the fourth lens L4 is a concave surface, and the image side S8 is a convex surface;

[0100] The fifth lens L5 has a negative focal power, the object side S9 of the fifth lens L5 is a concave surface, and the image side S10 is a convex surface;

[0101] The sixth lens L6 has a positive focal power, and the object side S11 and the image side S12 of the sixth lens L6 are both convex surfaces;

[0102] The seventh lens L7 has a negative focal power, and the object side S13 and the image side S14 of the seventh lens L7 are both concave surfaces;

[0103] The filter G1, the object side S15 and the image side S16 of the filter G1 are both flat surfaces;

[0104] The protective glass G2 has a plane material side S17 and a plane image side S18;

[0105] The imaging surface S19 is a plane;

[0106] The third lens L3 and the fourth lens L4 can be cemented to form a cemented lens.

[0107] The related parameters of the lenses in the optical lens in Embodiment 1 are shown in Table 1-1.

[0108] Table 1-1

[0109]

[0110]

[0111] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0112] Table 1-2

[0113] Face number K A B C D E F S3 -2.59E-01 0.00E+00 3.81E-04 1.67E-05 -1.15E-06 1.06E-07 -2.30E-09 S4 1.46E+01 0.00E+00 3.22E-04 -1.14E-05 2.36E-06 -1.27E-07 3.95E-09 S10 -9.13E+00 0.00E+00 5.12E-04 2.08E-05 -4.14E-06 1.07E-07 1.18E-09 S11 -5.22E+01 0.00E+00 2.63E-03 -6.72E-05 6.05E-06 -3.60E-07 5.87E-09 S12 -9.27E+00 0.00E+00 1.38E-03 -4.34E-05 4.71E-06 -1.52E-07 2.24E-09 S13 1.51E+00 0.00E+00 1.18E-03 -1.04E-06 5.44E-06 -2.94E-07 1.24E-08

[0114] Figure 2 A field curvature curve diagram of Embodiment 1 is shown, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the diagram, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.04 mm, which indicates that the optical lens can correct the field curvature very well.

[0115] Figure 3 An F-Tanθ distortion curve diagram of Embodiment 1 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the diagram, the F-Tanθ distortion of the optical lens is controlled within ±24% and changes uniformly, which indicates that the F-Tanθ distortion of the optical lens is effectively controlled, which is conducive to the processing by software algorithm later.

[0116] Figure 4 A relative luminance curve diagram of Embodiment 1 is shown, which represents the relative luminance values of different field angles on the imaging surface, the horizontal axis represents the half field of view (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the diagram, the relative luminance value of the optical lens is still greater than 70% at the maximum half field of view, which indicates that the optical lens has very good relative luminance.

[0117] Figure 5A modulation transfer function (MTF) curve of the embodiment 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution capability in the case of low frequency and high frequency.

[0118] Figure 6 An axial aberration curve of the embodiment 1 is shown, which represents the aberration of the optical axis at the imaging surface at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ±15 μm, which indicates that the optical lens can well correct the axial aberration.

[0119] Figure 7 A curve of the axial aberration of the embodiment 1 is shown, which represents the color difference at different image heights on the imaging surface at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the axial aberration value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, which indicates that the optical lens can very well correct the color difference of the edge field of view and the secondary spectrum of the entire image surface.

[0120] Embodiment 2

[0121] Please refer to Figure 8 , which is a structural schematic diagram of the optical lens provided in the embodiment 2 of the present application, which comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0122] The first lens L1 has a negative focal power, and the object side S1 and the image side S2 are both concave surfaces;

[0123] The diaphragm ST;

[0124] The second lens L2 has a positive focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface;

[0125] The third lens L3 has a positive focal power, and the object side S5 and the image side S6 are both convex surfaces;

[0126] The fourth lens L4 has a negative focal power, the object side S7 is a concave surface, and the image side S8 is a convex surface;

[0127] The fifth lens L5 has negative refractive power, the object side S9 is a concave surface, and the image side S10 is a convex surface;

[0128] The sixth lens L6 has positive refractive power, the object side S11 and the image side S12 are both convex surfaces;

[0129] The seventh lens L7 has negative refractive power, the object side S13 and the image side S14 are both concave surfaces;

[0130] The filter G1 has a plane object side S15 and a plane image side S16;

[0131] The protective glass G2 has a plane object side S17 and a plane image side S18;

[0132] The imaging surface S19 is a plane;

[0133] The third lens L3 and the fourth lens L4 can be cemented to form a cemented lens.

[0134] The related parameters of the lenses in the optical lens in Embodiment 2 are shown in Table 2-1.

[0135] Table 2-1

[0136]

[0137]

[0138] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 2 are shown in Table 2-2.

[0139] Table 2-2

[0140] Face number K A B C D E F S3 -1.82E-01 0.00E+00 4.21E-04 1.38E-05 -8.48E-07 1.02E-07 -2.79E-09 S4 1.95E+01 0.00E+00 5.11E-04 -6.88E-06 2.78E-06 -1.89E-07 7.67E-09 S10 -1.02E+01 0.00E+00 4.65E-04 9.89E-06 -4.17E-06 9.10E-08 7.01E-10 S11 -8.51E+01 0.00E+00 2.76E-03 -5.39E-05 5.99E-06 -3.85E-07 4.78E-09 S12 -7.86E+00 0.00E+00 1.16E-03 -5.04E-05 4.69E-06 -1.48E-07 2.85E-09 S13 1.40E+00 0.00E+00 6.94E-04 -8.34E-06 5.30E-06 -3.05E-07 1.18E-08

[0141] Figure 9 The field curvature curve of Embodiment 2 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.04 mm, which shows that the optical lens can correct the field curvature very well.

[0142] Figure 10 The F-Tanθ distortion curve of Embodiment 2 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within ±24% and changes uniformly, which shows that the F-Tanθ distortion of the optical lens is effectively controlled, which is conducive to the processing by software algorithm in the later stage.

[0143] Figure 11 A relative luminance curve of Example 2 is shown, which represents the relative luminance values of different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has excellent relative luminance.

[0144] Figure 12 A modulation transfer function (MTF) curve of Example 2 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present embodiment is above 0.4 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution capability in low and high frequency cases.

[0145] Figure 13 An axial aberration curve of Example 2 is shown, which represents the aberration of the optical axis at the imaging plane at each wavelength, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±10 μm, indicating that the optical lens can well correct the axial aberration.

[0146] Figure 14 A curve of the axial chromatic aberration of Example 2 is shown, which represents the chromatic aberration of different image heights on the imaging plane at each wavelength relative to the center wavelength (0.55 μm), the horizontal axis represents the axial chromatic aberration value (unit: μm) of each wavelength relative to the center wavelength, and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0147] Example 3

[0148] Please refer to Figure 15 , which is a structural schematic diagram of the optical lens provided in Example 3 of the present application, which comprises, along the optical axis from the object side to the imaging plane, a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1 and a protective glass G2.

[0149] The first lens L1 has a negative focal power, and both the object side S1 and the image side S2 are concave;

[0150] The stop ST;

[0151] The second lens L2 has positive refractive power, the object side S3 is a convex surface, and the image side S4 is a concave surface;

[0152] The third lens L3 has positive refractive power, the object side S5 and the image side S6 are both convex surfaces;

[0153] The fourth lens L4 has negative refractive power, the object side S7 is a concave surface, and the image side S8 is a convex surface;

[0154] The fifth lens L5 has negative refractive power, the object side S9 is a concave surface, and the image side S10 is a convex surface; the sixth lens L6 has positive refractive power, the object side S11 and the image side S12 are both convex surfaces;

[0155] The seventh lens L7 has negative refractive power, the object side S13 and the image side S14 are both concave surfaces;

[0156] The filter G1 has a planar object side S15 and a planar image side S16;

[0157] The protective glass G2 has a planar object side S17 and a planar image side S18;

[0158] The imaging surface S19 is planar;

[0159] The third lens L3 and the fourth lens L4 can be cemented to form a cemented lens.

[0160] The related parameters of the lenses in the optical lens in Embodiment 3 are shown in Table 3-1.

[0161] Table 3-1

[0162]

[0163] The surface type parameters of the aspherical lenses of the optical lens in Embodiment 3 are shown in Table 3-2.

[0164] Table 3-2

[0165]

[0166]

[0167] Figure 16 The field curvature curve of Embodiment 3 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.08 mm, which indicates that the optical lens can well correct the field curvature.

[0168] Figure 17The F-Tanθ distortion curve of Example 3 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens is uniformly changed within ±24%, which indicates that the F-Tanθ distortion of the optical lens is effectively controlled, which is conducive to subsequent processing by software algorithm.

[0169] Figure 18 The relative illumination curve of Example 3 is shown, which represents the relative illumination value of different field angles on the imaging plane. The horizontal axis represents the half field of view (unit: °), and the vertical axis represents the relative illumination (unit: %). As can be seen from the figure, the relative illumination value of the optical lens is still greater than 70% at the maximum half field of view, which indicates that the optical lens has excellent relative illumination.

[0170] Figure 19 The modulation transfer function (MTF) curve of Example 3 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the present embodiment is above 0.4 within the full field of view, and in the range of 0-160 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, and has good imaging quality and good detail resolution ability in low and high frequency cases.

[0171] Figure 20 The axial aberration curve of Example 3 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±15 μm, which indicates that the optical lens can well correct the axial aberration.

[0172] Figure 21 The curve of the axial chromatic aberration of Example 3 is shown, which represents the chromatic aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm). The horizontal axis represents the axial chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the axial chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image plane.

[0173] Example 4

[0174] Please refer to Figure 22Figure 4 shows a structural schematic diagram of an optical lens provided in Embodiment 4 of the present application, which comprises, along an optical axis from an object side to an imaging surface, a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.

[0175] The first lens L1 has a negative focal power, and both the object side S1 and the image side S2 thereof are concave;

[0176] The stop ST;

[0177] The second lens L2 has a positive focal power, and the object side S3 thereof is convex, while the image side S4 thereof is concave;

[0178] The third lens L3 has a positive focal power, and both the object side S5 and the image side S6 thereof are convex;

[0179] The fourth lens L4 has a negative focal power, and the object side S7 thereof is concave, while the image side S8 thereof is convex;

[0180] The fifth lens L5 has a negative focal power, and the object side S9 thereof is concave, while the image side S10 thereof is convex;

[0181] The sixth lens L6 has a positive focal power, and both the object side S11 and the image side S12 thereof are convex;

[0182] The seventh lens L7 has a negative focal power, and both the object side S13 and the image side S14 thereof are concave;

[0183] The filter G1 has both the object side S15 and the image side S16 thereof as flat surfaces;

[0184] The protective glass G2 has both the object side S17 and the image side S18 thereof as flat surfaces;

[0185] The imaging surface S19 is flat;

[0186] The third lens L3 and the fourth lens L4 can be glued to form a glued lens.

[0187] The related parameters of the lenses in the optical lens in Embodiment 4 are shown in Table 4-1.

[0188] Table 4-1

[0189]

[0190]

[0191] The surface type parameters of the aspherical lenses in the optical lens in Embodiment 4 are shown in Table 4-2.

[0192] Table 4-2

[0193] Face number K A B C D E F S3 -2.19E-01 0.00E+00 3.90E-04 2.09E-05 -1.13E-06 9.36E-08 -1.57E-09 S4 1.54E+01 0.00E+00 4.19E-04 -4.66E-06 2.32E-06 -1.44E-07 4.48E-09 S10 -8.93E+00 0.00E+00 3.92E-04 3.12E-05 -3.71E-06 1.13E-07 2.10E-09 S11 -6.16E+01 0.00E+00 2.65E-03 -7.04E-05 6.37E-06 -3.43E-07 6.25E-09 S12 -7.32E+00 0.00E+00 1.02E-03 -5.98E-05 4.17E-06 -1.51E-07 4.48E-09 S13 1.39E+00 0.00E+00 6.53E-04 -6.93E-06 4.80E-06 -3.18E-07 1.21E-08

[0194] Figure 23 The field curvature curve of Example 4 is shown, which represents the bending degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens can correct the field curvature very well.

[0195] Figure 24 The F-Tanθ distortion curve of Example 4 is shown, which represents the F-Tanθ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens is controlled within ±24% and changes uniformly, which shows that the F-Tanθ distortion of the optical lens is effectively controlled, which is conducive to the processing by software algorithm later.

[0196] Figure 25 The relative luminance curve of Example 4 is shown, which represents the relative luminance value of different field angles on the imaging surface, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative luminance (unit: %). It can be seen from the figure that the relative luminance value of the optical lens is still greater than 70% at the maximum half field angle, which shows that the optical lens has very good relative luminance.

[0197] Figure 26 The modulation transfer function (MTF) curve of Example 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the present embodiment is above 0.4 within the full field of view, and in the range of 0-160 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 frequency and high frequency conditions.

[0198] Figure 27 The axial aberration curve of Example 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±10 μm, which shows that the optical lens can correct the axial aberration well.

[0199] Figure 28The vertical color aberration curve of the embodiment 4 is shown, which represents the color aberration of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55 μm), the horizontal axis represents the vertical color aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical color aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, which indicates that the optical lens can well correct the color aberration of the edge field and the secondary spectrum of the entire image plane.

[0200] Referring to Table 5, the optical characteristics of the above-mentioned embodiments are shown, including the effective focal length f, the total optical length TTL, the F number FNO, the real image height IH, the field angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0201] Table 5

[0202]

[0203]

[0204] In summary, the optical lens of the embodiments of the present application realizes the effects of high definition, large aperture and miniaturization by reasonably matching the lens shape and refractive power combination between each lens.

[0205] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative 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.

[0206] 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 the limitation of the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope 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, there are: a first lens with negative refractive power, both the object side surface and the image side surface of which are concave; a second lens with positive refractive power, the object side surface of which is convex and the image side surface of which is concave; a third lens with positive refractive power, both the object side surface and the image side surface of which are convex; a fourth lens with negative refractive power, the object side surface of which is concave and the image side surface of which is convex; a fifth lens with negative refractive power, the object side surface of which is concave and the image side surface of which is convex; a sixth lens with positive refractive power, both the object side surface and the image side surface of which are convex; a seventh lens with negative refractive power, both the object side surface and the image side surface of which are concave; The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view, and the light aperture diameter D1 of the object side surface of the first lens satisfy: 1.2 < D1 / IH / Tan(FOV / 2) < 1.

5.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f satisfy: 5.0 < TTL / f < 5.

8.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 1.4 < IH / f < 1.

7.

4. The optical lens of claim 1, wherein, The back focal length BFL of the optical lens and the effective focal length f satisfy: 0.3 < BFL / f < 0.

5.

5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.7 < (IH / 2) / (f x Tan(FOV / 2)) < 0.

8.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.6 < f1 / f < 0.

7. The optical lens of claim 1, wherein An effective focal length f5 of the fifth lens and a radius of curvature R9 of an object side surface and a radius of curvature R 10 respectively satisfy: 0.3 < R9 / f5 < 0.7; 0.9 < R 10 f5 < 3.

5.

8. The optical lens of claim 1, wherein, Sag of the half-aperture of the image side of the seventh lens 14 With light transmission half-aperture d 14 Satisfies: 0.28 < Sag 14 / d 14 <0.

36.

9. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -2.5 < f7 / f < 0.

10. The optical lens of claim 1, wherein, The total optical 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: 0.5 < ∑CT / TTL < 0.7.

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