Optical lens
By designing an optical lens with a total of seven lenses in the panoramic surround view system, the problems of large aberration, large field curve and poor imaging quality in the prior art are solved, and better imaging quality is achieved.
Patent Information
- Application Number
- CN202311608150.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-21
- Filing Date
- 2023-11-29
- Publication Date
- 2025-02-21
AI Technical Summary
The existing vehicle-mounted optical lenses have problems such as large aberration, large field curves and poor imaging quality in the panoramic surround viewing system, which is difficult to meet user needs.
An optical lens with a total of seven lenses was designed. By reasonably configuring the surface shape and power of each lens, the aberration is reduced and the imaging quality is improved.
It improves the imaging quality of optical lenses, reduces aberrations, improves imaging quality, and meets users' needs for high-quality imaging.
Smart Images
Figure CN119493241A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art
[0002] As people's requirements for driving experience continue to increase, automotive optical lenses are increasingly used in intelligent driving, and the status of automotive optical lenses in the automotive-related industries continues to improve.
[0003] The panoramic view system sets up multiple surround view cameras around the car to cover the entire field of view around the vehicle, and fuses the perspectives of multiple cameras into a 360-degree overhead view of the surrounding vehicle body, which is finally displayed on the screen of the center console, allowing the driver to clearly check whether there are obstacles around the vehicle and understand the relative position and distance of the obstacles, helping the driver to park the vehicle easily. Not only is it very intuitive, but there are no blind spots, which can help the driver calmly control the vehicle to park or pass through complex roads, effectively reducing the occurrence of scratches, collisions, sinking and other accidents.
[0004] At present, surround-view camera lenses generally use wide-angle lenses, which have problems such as large aberrations, large field curvature, and poor image quality, making it difficult to meet user needs. Summary of the invention
[0005] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.
[0006] The present invention provides an optical lens, which comprises seven lenses in total, and includes the following lenses in order from the object side to the imaging surface along the optical axis:
[0007] The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave;
[0008] A second lens having negative optical power, whose image side surface is concave;
[0009] A third lens element having positive refractive power and a convex image-side surface;
[0010] a fourth lens element having negative optical power, whose object side surface is concave and image side surface is convex;
[0011] A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave;
[0012] a sixth lens having positive refractive power and a convex object-side surface;
[0013] a seventh lens having optical power and having an image side surface which is convex;
[0014] The object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: (R7+R8) / (R7-R8)<-2.5.
[0015] Further preferably, a curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: 1.0<(R1+R2) / (R1-R2)<2.5.
[0016] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 3.5 <R1 / f。
[0017] Further preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: 7.5 <TTL / f<11.0。
[0018] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 2.5 <TTL / IH<3.5。
[0019] Further preferably, the effective focal length f of the optical lens, the arc θ of the maximum half field of view angle, and the real image height IH corresponding to the maximum field of view angle satisfy: 0.9<(IH / 2) / (f×θ)<1.0.
[0020] Further preferably, the maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 70° <FOV / FNO<140°。
[0021] Further preferably, the real image height IH and entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.0 <IH / EPD<6.5。
[0022] Further preferably, the optical back focal length BFL of the optical lens and the effective focal length f satisfy: 1.0 <BFL / f<2.5。
[0023] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -5.0 <f1 / f<-3.0。
[0024] The optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through reasonable configuration of the surface shapes of each lens and reasonable matching of the optical focal length. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0026] Figure 1Schematic diagram of the structure of the optical lens in Example 1 of the present invention.
[0027] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.
[0028] Figure 3 : is the F-Theta distortion curve of the optical lens in Example 1 of the present invention.
[0029] Figure 4 This is a relative illumination curve diagram of the optical lens in Example 1 of the present invention.
[0030] Figure 5 This is the MTF curve diagram of the optical lens in Example 1 of the present invention.
[0031] Figure 6 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.
[0032] Figure 7 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.
[0033] Figure 8 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.
[0034] Fig. 9 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.
[0035] Fig.10 : is the F-Theta distortion curve of the optical lens in Example 2 of the present invention.
[0036] Fig.11 This is a relative illumination curve diagram of the optical lens in Example 2 of the present invention.
[0037] Fig.12 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.
[0038] Fig.13 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.
[0039] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.
[0040] Fig.15 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.
[0041] Fig.16 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.
[0042] Fig.17 : is the F-Theta distortion curve of the optical lens in Example 3 of the present invention.
[0043] Fig.18 This is a relative illumination curve diagram of the optical lens in Example 3 of the present invention.
[0044] Fig.19 This is the MTF curve diagram of the optical lens in Example 3 of the present invention.
[0045] Fig. 20 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.
[0046] Fig.21 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.
[0047] Fig. 22 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.
[0048] Fig.23 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.
[0049] Fig.24 : is the F-Theta distortion curve of the optical lens in Example 4 of the present invention.
[0050] Fig.25 This is a relative illumination curve diagram of the optical lens in Example 4 of the present invention.
[0051] Fig.26 This is the MTF curve diagram of the optical lens in Example 4 of the present invention.
[0052] Fig. 27 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.
[0053] Fig.28 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.
[0054] Fig.29 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.
[0055] Fig.30 4 is a field curvature curve diagram of the optical lens in Example 5 of the present invention.
[0056] Fig.31 : is the F-Theta distortion curve of the optical lens in Example 5 of the present invention.
[0057] Fig.32 This is a relative illumination curve diagram of the optical lens in Example 5 of the present invention.
[0058] Fig.33 This is the MTF curve diagram of the optical lens in Example 5 of the present invention.
[0059] Fig.34 Graph showing the axial aberration of the optical lens in Embodiment 5 of the present invention.
[0060] Fig.35 Graph showing the vertical axis chromatic aberration of the optical lens in Example 5 of the present invention.
[0061] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0062] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0063] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.
[0064] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.
[0065] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.
[0066] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.
[0067] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.
[0068] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0069] The optical lens of the embodiment of the present invention includes, from the object side to the imaging surface along the optical axis, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, a filter and a protective glass.
[0070] In some embodiments, the first lens may have a negative optical power, which is beneficial to reduce the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side of the first lens is convex, and the image side is concave, which is beneficial to collect the edge field of view light as much as possible into the rear optical lens, and realize large-angle light collection.
[0071] In some embodiments, the second lens may have a negative focal length, which can share the negative focal length of the front end of the lens, thereby reducing the excessive deflection of light caused by the excessive concentration of the focal length of the first lens, and reducing the difficulty of correcting the chromatic aberration of the optical lens. The image side of the second lens is a concave surface, which is conducive to converging the outgoing light and avoiding the outer diameter of the lens being too large.
[0072] In some embodiments, the third lens may have positive focal length, which is beneficial to improving the light convergence capability of the optical lens. The image side of the third lens is convex, which is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.
[0073] In some embodiments, the fourth lens may have negative optical power, with its object side being concave and its image side being convex; this is beneficial in reducing the light deflection angle, allowing the light to transition smoothly and improving the imaging quality of the optical lens.
[0074] In some embodiments, the fifth lens may have a negative optical power, which is beneficial to increase the imaging area of the optical lens and improve the imaging quality of the optical lens. The object side of the fifth lens is convex and the image side is concave, which can reduce the ghost energy of the light reflected from the object side of the fifth lens, and can also reduce the spherical aberration generated by the fifth lens itself, thereby improving the imaging quality of the optical lens.
[0075] In some embodiments, the sixth lens may have a positive optical power, which is beneficial to improving the chromatic aberration of the optical lens and enhancing the imaging quality of the optical lens. The object side surface of the sixth lens is convex, which is beneficial to forming a cemented lens in cooperation with the fifth lens, thereby improving the chromatic aberration of the optical lens and enhancing the imaging quality of the optical lens.
[0076] In some embodiments, the image side surface of the seventh lens is convex, which is beneficial to increasing the imaging area of the optical lens and enhancing the imaging quality of the optical lens.
[0077] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: (R7 + R8) / (R7 - R8) < -2.5. Satisfying the above range can effectively correct the spherical aberration of the optical lens and at the same time reduce the influence of astigmatism on the imaging of the optical lens; in addition, it can also increase the effective aperture in the optical path, thereby increasing the field of view angle of the system.
[0078] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 1.0 < (R1 + R2) / (R1 - R2) < 2.5. Satisfying the above range, by adjusting the radii of curvature of the object side surface and the image side surface of the first lens, better light control ability can be provided, and the clarity and contrast of imaging can be improved.
[0079] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 3.5 < R1 / f. The radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: R2 / f < 1.9. Satisfying the above range is beneficial to realizing the ultra-wide angle characteristic, so that more scene information can be obtained to meet the needs of large-range detection of the optical lens.
[0080] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f satisfy: 7.5 < TTL / f < 11.0. Satisfying the above range ensures that there is enough space to adjust the lens structure and optimize the imaging effect.
[0081] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle satisfy: 2.5 < TTL / IH < 3.5. Satisfying the above range can effectively balance the requirements of the image height and miniaturization of the optical lens.
[0082] In some embodiments, the effective focal length f of the optical lens, the radian θ of the maximum half field of view angle, and the true image height IH corresponding to the maximum field of view angle satisfy: 0.9 < (IH / 2) / (f×θ) < 1.0. Satisfying the above range is beneficial to controlling the smooth change of the edge distortion of the optical lens, which is convenient for later restoration through software algorithms.
[0083] In some embodiments, the maximum field of view (FOV) of the optical lens and the f-number (FNO) satisfy: 70° < FOV / FNO < 140°. Meeting the above range is beneficial to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens obtaining more scene information and meeting the requirements of large-range detection. The realization of the large-aperture characteristic is beneficial to improving the problem of rapid decline in relative brightness in the edge field of view, and thus is also conducive to obtaining more scene information.
[0084] In some embodiments, the true image height (IH) corresponding to the maximum field of view of the optical lens and the entrance pupil diameter (EPD) satisfy: 4.0 < IH / EPD < 6.5. Meeting the above range can increase the width of the light beam incident on the optical lens, so that the brightness at the image plane of the optical lens is improved and vignetting is avoided.
[0085] In some embodiments, the effective focal length (f) of the optical lens and the true image height (IH) corresponding to the maximum field of view satisfy: 2.5 < IH / f < 4.0. Meeting the above range is beneficial to achieving a balance between the field of view size and the F-Theta distortion size of the optical lens and improving the imaging quality of the optical lens.
[0086] In some embodiments, the back focal length (BFL) of the optical lens and the effective focal length (f) satisfy: 1.0 < BFL / f < 2.5. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical lens, it avoids interference between the lens and other components and reduces the assembly process difficulty of the camera module.
[0087] In some embodiments, the effective focal length (f) of the optical lens and the focal length (f1) of the first lens satisfy: -5.0 < f1 / f < -3.0. Meeting the above range can make the first lens have an appropriate negative optical power, which is beneficial to reducing the inclination angle of the incident light and is beneficial to collecting as much edge field light as possible into the rear optical lens to achieve large-angle light collection.
[0088] In some embodiments, the effective focal length (f) of the optical lens and the focal length (f2) of the second lens satisfy: -7.0 < f2 / f < -1.5. Meeting the above range can make the second lens have an appropriate negative optical power, which can share the negative optical power at the front end of the lens, thus being beneficial to reducing the excessive light deflection caused by the overly concentrated optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.
[0089] In some embodiments, the effective focal length (f) of the optical lens and the focal length (f3) of the third lens satisfy: 2.0 < f3 / f < 9.0. Meeting the above range can make the third lens have an appropriate positive optical power, which is beneficial to improving the light converging ability of the optical lens. It is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.
[0090] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: f4 / f < -10.0. Meeting the above range is beneficial to reducing the light deflection angle, enabling the light path to transition smoothly, and improving the imaging quality of the optical lens.
[0091] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -5.0 < f5 / f < -2.0. Meeting the above range can endow the fifth lens with an appropriate negative optical power, which is beneficial to increasing the imaging area of the optical lens, optimizing the chromatic aberration of the optical lens, and improving the imaging quality of the optical lens.
[0092] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 1.0 < f6 / f < 2.0. Meeting the above range can endow the sixth lens with an appropriate positive optical power, which is beneficial to enhancing the light converging ability of the optical lens, balancing various aberrations generated by the optical lens, and improving the imaging quality of the optical lens.
[0093] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: f7 / f < 7.5. Meeting the above range enables the light path to transition smoothly and improves the imaging quality of the optical lens.
[0094] In some embodiments, the maximum field of view FOV of the optical lens satisfies: 155° < FOV < 225°. Meeting the above range can achieve a large field of view for the optical lens.
[0095] In some embodiments, the aperture value FNO of the optical lens satisfies: 1.5 < FNO < 2.5. Meeting the above range is beneficial to realizing the large aperture characteristic of the lens, increasing the light transmission amount, and improving the imaging effect of the lens in a dim environment.
[0096] 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: 2.5 < R1 / R2 < 6.0. Meeting the above range is beneficial to realizing the wide-angle characteristic, thereby being able to obtain more scene information and meeting the requirements of large-range detection of the optical lens.
[0097] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -23.0 < R3 / R4 < 2.0. Meeting the above range balances the aberrations generated by the second lens itself, thereby improving the imaging quality of the lens.
[0098] In some embodiments, 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: 0.3 < ∑CT / TTL < 0.7. Meeting the above range is beneficial to the structural design and production process of the optical lens.
[0099] In some embodiments, the effective focal length f of the optical lens and the central thickness CT3 of the third lens along the optical axis satisfy: 0.3 < CT3 / f < 2.6. Meeting the above range can improve the field curvature of the ultra-wide-angle lens by setting the thickness of the third lens, reduce the difficulty of optimizing lens aberrations, and thus improve the imaging quality of the lens.
[0100] In some embodiments, the fifth lens and the sixth lens can be glued together to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberrations of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.
[0101] In some embodiments, the seventh lens can adopt the aspherical lens surface type to improve the resolution quality.
[0102] To enable the system to have better optical performance, aspherical lenses are used in the lens, and the shapes of the aspherical surfaces of the optical lens satisfy the following equation:
[0103]
[0104] where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, 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 conic coefficient, and A, B, C, D, E, F are the surface coefficients of the second order, fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively.
[0105] The present invention will be further described in multiple embodiments below. In each embodiment, the thicknesses, curvature radii, and material selections of the various lenses in the optical lens are somewhat different. For specific differences, refer to the parameter tables of the respective embodiments. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.
[0106] Embodiment 1
[0107] Please refer to Figure 1, which is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.
[0108] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;
[0109] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both concave;
[0110] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;
[0111] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;
[0112] Aperture ST;
[0113] The fifth lens L5 has negative refractive power, and its object-side surface S9 is convex, and its image-side surface S10 is concave;
[0114] The sixth lens L6 has positive refractive power, an object-side surface S10 thereof is convex, and an image-side surface S11 thereof is concave;
[0115] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;
[0116] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;
[0117] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;
[0118] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;
[0119] The imaging surface S18 is a plane.
[0120] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.
[0121] Table 1-1
[0122]
[0123] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.
[0124] Table 1-2
[0125] Face number K A B C D E F S12 -7.14E+01 0.00E+00 5.41E-03 -1.86E-03 2.74E-04 -2.60E-05 9.94E-07 S13 1.17E+00 0.00E+00 6.14E-05 -4.77E-04 6.54E-05 -5.48E-06 1.75E-07
[0126] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown.
[0127] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.05mm to 0.15mm, indicating that the optical lens can correct the field curvature well.
[0128] Figure 3 The F-Theta distortion curve of Example 1 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.
[0129] Figure 4 The relative illumination curve of Example 1 is shown, which represents the relative illumination values at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 40% at the maximum half viewing angle, indicating that the optical lens has good relative illumination.
[0130] Figure 5 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.
[0131] Figure 6The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -25μm to 15μm, indicating that the optical lens can correct the axial aberration well.
[0132] Figure 7 The vertical chromatic aberration curve of Example 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -5 μm to 6 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.
[0133] Example 2
[0134] See also Figure 8 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.
[0135] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;
[0136] The second lens L2 has negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave;
[0137] The third lens L3 has positive refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;
[0138] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;
[0139] Aperture ST;
[0140] The fifth lens L5 has negative refractive power, and its object-side surface S9 is convex, and its image-side surface S10 is concave;
[0141] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;
[0142] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;
[0143] The seventh lens L7 has negative refractive power, its object-side surface S12 is concave, and its image-side surface S13 is convex;
[0144] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;
[0145] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;
[0146] The imaging surface S18 is a plane.
[0147] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.
[0148] Table 2-1
[0149]
[0150]
[0151] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.
[0152] Table 2-2
[0153] Face number K A B C D E F S12 6.34E+00 0.00E+00 -1.83E-03 -1.18E-04 3.05E-05 -3.99E-06 2.12E-07 S13 2.36E+01 0.00E+00 -3.39E-04 -4.63E-05 1.41E-05 -1.02E-06 3.44E-08
[0154] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 shown.
[0155] Fig. 9 The field curvature curve of Example 2 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.06mm to 0.04mm, indicating that the optical lens can correct the field curvature well.
[0156] Fig.10 The F-Theta distortion curve of Example 2 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -8% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.
[0157] Fig.11 The relative illumination curve of Example 2 is shown, which represents the relative illumination values at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 60% at the maximum half viewing angle, indicating that the optical lens has good relative illumination.
[0158] Fig.12 The MTF (Modulation Transfer Function) curve of Example 2 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.
[0159] Fig.13 The axial aberration curve of Example 2 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -5μm to 30μm, indicating that the optical lens can correct the axial aberration well.
[0160] Fig.14 The vertical chromatic aberration curve of Example 2 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 5 μm, indicating that the optical lens can perfectly correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.
[0161] Example 3
[0162] See also Fig.15 , which is a schematic diagram of the structure of the optical lens provided in Embodiment 3 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1 and a protective glass G2.
[0163] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;
[0164] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both concave;
[0165] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both convex;
[0166] The fourth lens L4 has negative refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;
[0167] Aperture ST;
[0168] The fifth lens L5 has negative refractive power, and its object-side surface S9 is convex, and its image-side surface S10 is concave;
[0169] The sixth lens L6 has positive refractive power, and its object-side surface S10 and image-side surface S11 are both convex surfaces;
[0170] The fifth lens L5 and the sixth lens L6 form a cemented lens group, that is, the cemented surface between the image side surface of the fifth lens L5 and the object side surface of the sixth lens L6 is S10;
[0171] The seventh lens L7 has positive refractive power, and its object-side surface S12 and image-side surface S13 are both convex surfaces;
[0172] The object side surface S14 and the image side surface S15 of the filter G1 are both planes;
[0173] The object side surface S16 and the image side surface S17 of the protective glass G2 are both flat surfaces;
[0174] The imaging surface S18 is a plane.
[0175] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.
[0176] Table 3-1
[0177]
[0178]
[0179] The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.
[0180] Table 3-2
[0181] Face number K A B C D E F S12 7.64E+01 0.00E+00 -1.79E-03 -5.08E-05 7.80E-06 -2.06E-06 1.18E-07 S13 6.06E+01 0.00E+00 1.71E-04 -1.20E-04 1.85E-05 -1.52E-06 5.19E-08
[0182] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.16 , Fig.17 , Fig.18 , Fig.19 , Fig. 20 , Fig.21 shown.
[0183] Fig.16 The field curvature curve of Example 3 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.09mm to 0.07mm, indicating that the optical lens can correct the field curvature well.
[0184] Fig.17 The F-Theta distortion curve of Example 3 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -6% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.
[0185] Fig.18 The relative illumination curve of Example 3 is shown, which represents the relative illumination values at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.
[0186] Fig.19 The MTF (Modulation Transfer Function) curve of Example 3 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.
[0187] Fig. 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. It can be seen from the figure that the offset of the axial aberration is controlled within -20μm to 20μm, indicating that the optical lens can correct the axial aberration well.
[0188] Fig.21The vertical chromatic aberration curve of Example 3 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2 μm to 3 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.
[0189] Example 4
[0190] See also Fig. 22 , which is a schematic diagram of the structure of the optical lens provided in Example 4 of the present invention. Compared with Example 3, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.
[0191] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.
[0192] Table 4-1
[0193]
[0194]
[0195] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.
[0196] Table 4-2
[0197] Face number K A B C D E F S12 -2.00E+02 0.00E+00 -3.27E-03 -2.01E-04 2.98E-05 -3.44E-06 1.40E-07 S13 1.32E+01 0.00E+00 -2.61E-03 -1.77E-04 2.66E-05 -2.37E-06 7.60E-08
[0198] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.23 , Fig.24 , Fig.25 , Fig.26 , Fig. 27 , Fig.28 shown.
[0199] Fig.23 The field curvature curve of Example 4 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.04mm to 0.06mm, indicating that the optical lens can correct the field curvature well.
[0200] Fig.24The F-Theta distortion curve of Example 4 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -8% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.
[0201] Fig.25 The relative illumination curve of Example 4 is shown, which represents the relative illumination values at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.
[0202] Fig.26 The MTF (Modulation Transfer Function) curve of Example 4 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.
[0203] Fig. 27 The axial aberration curve of Example 4 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -30μm to 15μm, indicating that the optical lens can correct the axial aberration well.
[0204] Fig.28 The vertical chromatic aberration curve of Example 4 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 5 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.
[0205] Example 5
[0206] See also Fig.29, which is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention. Compared with Example 3, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.
[0207] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.
[0208] Table 5-1
[0209]
[0210]
[0211] The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.
[0212] Table 5-2
[0213] Face number K A B C D E F S12 2.00E+02 0.00E+00 -6.65E-03 -5.01E-04 1.29E-04 -2.57E-05 1.79E-06 S13 2.00E+02 0.00E+00 -5.42E-03 -2.33E-04 5.28E-05 -8.70E-06 5.55E-07
[0214] In this embodiment, the field curvature curve, F-Theta distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens are shown as follows: Fig.30 , Fig.31 , Fig.32 , Fig.33 , Fig.34 , Fig.35 shown.
[0215] Fig.30 The field curvature curve of Example 5 is shown, which indicates the degree of curvature of light of different wavelengths on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.08mm to 0.08mm, indicating that the optical lens can correct the field curvature well.
[0216] Fig.31 The F-Theta distortion curve of Example 5 is shown, which represents the F-Theta distortion of light of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens is controlled within -10% to 0, the image compression in the edge angle area is relatively gentle, and the clarity of the expanded image is effectively improved.
[0217] Fig.32The relative illumination curve of Example 5 is shown, which represents the relative illumination values at different viewing angles on the imaging surface, the horizontal axis represents the half viewing angle (unit: °), and the vertical axis represents the relative illumination (unit: %). It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half viewing angle, indicating that the optical lens has a good relative illumination.
[0218] Fig.33 The MTF (Modulation Transfer Function) curve of Example 5 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the whole field of view, and in the range of 0 to 160 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in both low-frequency and high-frequency conditions.
[0219] Fig.34 The axial aberration curve of Example 5 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: μm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -15μm to 18μm, indicating that the optical lens can correct the axial aberration well.
[0220] Fig.35 The vertical chromatic aberration curve of Example 5 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging surface, the horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -4 μm to 5 μm, indicating that the optical lens can extremely well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface.
[0221] Please refer to Table 6, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH and the maximum field of view FOV of the optical lens, and the numerical values corresponding to each conditional expression in each embodiment.
[0222] Table 6
[0223]
[0224]
[0225] In summary of the above embodiments, the optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens through the reasonable configuration of the surface shapes of each lens and the reasonable matching of the optical power.
[0226] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0227] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
Claims
1. An optical lens, comprising seven lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: The first lens has a negative optical power, and its object side surface is convex and its image side surface is concave; A second lens having negative optical power, whose image side surface is concave; A third lens element having positive refractive power and a convex image-side surface; a fourth lens element having negative optical power, whose object side surface is concave and image side surface is convex; A fifth lens having negative optical power, whose object side surface is convex and image side surface is concave; a sixth lens having positive refractive power and a convex object-side surface; a seventh lens having optical power and having an image side surface which is convex; The object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: (R7+R8) / (R7-R8)<-2.
5.
2. The optical lens according to claim 1, characterized in that: The object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: 1.0<(R1+R2) / (R1-R2)<2.
5.
3. The optical lens according to claim 1, characterized in that: The object side curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy: 3.5 <R1 / f。 4. The optical lens according to claim 1, characterized in that: The total optical length TTL and the effective focal length f of the optical lens satisfy: 7.5 <TTL / f<11.0。 5. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 2.5 <TTL / IH<3.5。 6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens, the arc θ of the maximum half field angle, and the real image height IH corresponding to the maximum field angle satisfy the following: 0.9<(IH / 2) / (f×θ)<1.
0.
7. The optical lens according to claim 1, characterized in that: The maximum field of view FOV and aperture value FNO of the optical lens meet the following requirements: 70° <FOV / FNO<140°。 8. The optical lens according to claim 1, characterized in that: The real image height IH and entrance pupil diameter EPD corresponding to the maximum field of view of the optical lens meet the following requirements: 4.0 <IH / EPD<6.5。 9. The optical lens according to claim 1, characterized in that: The optical back focal length BFL of the optical lens and the effective focal length f satisfy: 1.0 <BFL / f<2.5。 10. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -5.0 <f1 / f<-3.0。