Optical lens

Abstract

The present invention provides an optical lens, which includes, from the object side to the imaging surface along the optical axis: a first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens with negative optical power, whose image side surface is concave; a third lens with negative optical power, whose object side surface is concave and whose image side surface is convex; a fourth lens with positive optical power, whose object side surface is concave and whose image side surface is convex; a fifth lens with positive optical power, whose object side surface is convex and whose image side surface is concave; a sixth lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a seventh lens with positive optical power, whose object side surface is convex and whose image side surface is convex; an eighth lens with negative optical power, whose object side surface is concave and whose image side surface is concave; and a ninth lens with positive optical power, whose object side surface is convex and whose image side surface is concave. The optical lens of the present invention can improve the imaging quality of the optical lens and has the advantage of excellent imaging quality.

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] At present, with the increase in people's demand for taking photos, ordinary optical lenses can no longer meet people's imaging needs. People are in urgent need of a lens that can achieve ultra-wide-angle photography, and fisheye lenses can meet this requirement very well. Due to the ultra-wide-angle shooting characteristics of fisheye lenses, the actual shooting picture can accommodate more and wider scenes, which can meet the needs of shooting some large scene ranges, so it is widely used in sports cameras, drones, panoramic monitoring and other camera fields. However, existing fisheye lenses generally have the problem of large edge compression leading to a decrease in peripheral field resolution, and large edge distortion, resulting in serious image distortion, which cannot meet the current needs of wide-angle high-definition shooting. Summary of the invention

[0003] 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.

[0004] The present invention provides an optical lens, comprising nine lenses in total, which include the following lenses in order from the object side to the imaging surface along the optical axis:

[0005] The first lens has a negative optical power, the object side surface of which is convex, and the image side surface of which is concave;

[0006] A second lens having negative optical power, whose image side surface is concave;

[0007] The third lens has a negative optical power, its object side surface is concave, and its image side surface is convex;

[0008] a fourth lens having positive refractive power, whose object-side surface is concave and whose image-side surface is convex;

[0009] a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is concave;

[0010] a sixth lens element having negative optical power, whose object side surface is convex at the near optical axis and whose image side surface is concave;

[0011] a seventh lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex;

[0012] an eighth lens having negative optical power, whose object-side surface is concave and whose image-side surface is concave;

[0013] A ninth lens having positive refractive power, whose object side surface is convex and whose image side surface is concave;

[0014] Among them, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 9; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.5 < TTL / IH < 2.8.

[0015] Further preferably, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 60° < (f × FOV) / IH < 65°.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6 < f1 / f < -3.5; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -8 < f2 / f < -2.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f < -40.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2 < f4 / f < 6; the effective focal length f of the optical lens and the object-side curvature radius R7 of the fourth lens satisfy: -6.5 < R7 / f < -4.5.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.5 < f5 / f < 4; the effective focal length f of the optical lens and the image-side curvature radius R10 of the fifth lens satisfy: 6 < R10 / f < 18.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -5 < f6 / f < -2.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1 < f7 / f < 3.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -3 < f8 / f < -1.5; the effective focal length f of the optical lens and the image-side curvature radius R16 of the eighth lens satisfy: 1.5 < R16 / f < 4.

[0023] Further preferably, the effective focal length f of the optical lens and the focal length f9 of the ninth lens satisfy: 2 < f9 / f < 18; the effective focal length f of the optical lens and the image-side curvature radius R18 of the ninth lens satisfy: 1.5 < R18 / f < 4.

[0024] Compared with the prior art, the optical lens provided by the present invention adopts nine lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and improve the imaging quality of the optical lens, so that the lens has one or more advantages such as ultra-wide angle, small distortion, miniaturization, and large image surface. 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 1 Schematic 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 Graph showing the F-Theta distortion of the optical lens in Example 1 of the present invention.

[0029] Figure 4 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0030] Figure 5 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0031] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0032] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0033] Figure 8 Graph showing the F-Theta distortion of the optical lens in Embodiment 2 of the present invention.

[0034] Fig. 9 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0035] Fig.10 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0036] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0037] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0038] Fig.13Graph showing the F-Theta distortion of the optical lens in Embodiment 3 of the present invention.

[0039] Fig.14 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0040] Fig.15 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0041] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0042] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0043] Fig.18 4 is an F-Theta distortion curve of the optical lens in Example 4 of the present invention.

[0044] Fig.19 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0045] Fig. 20 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0046] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] The optical lens provided by the embodiment of the present invention comprises nine lenses in total, and the optical lens comprises, in order from the object side to the imaging surface along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens.

[0055] In some embodiments, the first lens may have a negative focal power, with its object side being convex and its image side being concave. The second lens may have a negative focal power, its object side may be concave or convex, and its image side is concave. The third lens may have a negative focal power, its object side is concave, and its image side is convex. The fourth lens may have a positive focal power, its object side is concave, and its image side is convex. The fifth lens may have a positive focal power, its object side is convex, and its image side is concave. The sixth lens may have a negative focal power, its object side is convex near the optical axis, and its image side is concave. The seventh lens may have a positive focal power, its object side is convex, and its image side is convex. The eighth lens may have a negative focal power, its object side is concave, and its image side is concave. The ninth lens may have a positive focal power, its object side is convex, and its image side is concave.

[0056] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the fourth lens and the fifth lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image formation. When the diaphragm is located between the fourth lens and the fifth lens, it is convenient for the correction of diaphragm aberration.

[0057] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the ninth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0058] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 9. By satisfying the above conditions, the length of the lens can be effectively limited, and miniaturization of the lens can be achieved.

[0059] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.5 < TTL / IH < 2.8. By satisfying the above conditions, when the total length of the lens is the same, a larger image surface can be ensured, enabling a larger-sized imaging chip to be matched to achieve high-definition imaging, and better achieving the balance between a small total length and a large image surface of the lens.

[0060] In some embodiments, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 60° < (f × FOV) / IH < 65°. By satisfying the above conditions, by reasonably restricting the relationship between the focal length, field of view angle, and image height of the optical lens, it is beneficial to achieve the balance between a large field of view angle and large target surface imaging of the optical lens.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6 < f1 / f < -3.5. Meeting the above conditions, by setting the first lens to have a large negative refractive power, it is beneficial to collect the marginal field light into the rear system as much as possible, achieving large-angle light collection, and thus realizing the ultra-wide-angle imaging of the lens.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -8 < f2 / f < -2. Meeting the above conditions, the second lens has a negative optical power and can share the negative optical power at the front end of the optical lens, which is beneficial to avoid excessive light deflection caused by the over-concentration of the optical power of the first lens and reduce the difficulty of chromatic aberration correction of the optical lens.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f < -40. Meeting the above conditions is beneficial to the smooth transition of light, reduces the difficulty of correcting aberration and distortion, and improves the overall imaging quality.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2 < f4 / f < 6. Meeting the above conditions, the fourth lens has a large positive optical power, can effectively converge the light in a large range entering the system, avoid excessive light deflection caused by the over-concentration of the negative optical power lenses in the front, reduce the difficulty of correcting aberration, and improve the imaging quality of the optical lens.

[0065] In some embodiments, the effective focal length f of the optical lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: -6.5 < R7 / f < -4.5. Meeting the above conditions, the fourth lens adopts a meniscus shape, which is beneficial to better converge the light, shorten the distance for the light to reach the next lens, and is beneficial to reducing the total length of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.5 < f5 / f < 4; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 6 < R10 / f < 18. Meeting the above conditions can further effectively converge the light, reduce the difficulty of correcting the marginal field distortion, ensure that the lens has a small distortion while achieving a large field of view angle, improve the resolution of the marginal field, and make the lens have a high imaging quality throughout the field of view.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -5 < f6 / f < -2. Meeting the above conditions, by setting the sixth lens to have a large negative refractive power, it is beneficial to slow down the deflection degree of the incident light, avoid excessive refraction changes and generate too many aberrations, and at the same time is beneficial to balancing various aberrations generated by the front lens group and improving the overall imaging quality.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1 < f7 / f < 3. Meeting the above conditions can make the seventh lens have an appropriate positive optical power, which is beneficial to balancing the coma, astigmatism and field curvature of the optical lens and improving the imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -3 < f8 / f < -1.5; the effective focal length f of the optical lens and the image-side curvature radius R16 of the eighth lens satisfy: 1.5 < R16 / f < 4. Meeting the above conditions is beneficial to diverging the light in the central field of view to a certain extent, and at the same time combining the curvature of the peripheral field of view to reduce the exit angle of the light in the peripheral field of view and improve the relative illumination of the peripheral field of view.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f9 of the ninth lens satisfy: 2 < f9 / f < 18; the effective focal length f of the optical lens and the image-side curvature radius R18 of the ninth lens satisfy: 1.5 < R18 / f < 4. Meeting the above conditions is beneficial to increasing the height of the light incident on the imaging surface, increasing the area of the light entering the imaging surface, realizing large-format imaging of the lens, and improving the imaging quality of the optical lens.

[0071] 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 angle of the optical lens satisfy: 3 < IH / f < 3.5. Meeting the above conditions can not only achieve wide-angle characteristics to meet the large-range shooting requirements, but also achieve large-image-surface characteristics to improve the imaging quality of the optical lens.

[0072] In some embodiments, the effective focal length f of the optical lens and the object-side curvature radius R11 of the sixth lens satisfy: 3 < R11 / f < 15; the effective focal length f of the optical lens and the image-side curvature radius R12 of the sixth lens satisfy: 1 < R12 / f < 2. Meeting the above conditions is beneficial to balancing the field curvature of the optical lens and improving the imaging quality of the optical lens.

[0073] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.3 < f1 / f2 < 2. Meeting the above conditions can effectively converge a wide range of light entering the system, and at the same time is conducive to the rear-end optical system to correct large-angle aberrations, thereby achieving the balance of miniaturization and high pixel count of the optical lens.

[0074] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -70 < f3 / f4 < -5. Meeting the above conditions is conducive to the smooth transition of light, and at the same time can better correct the distortion of the edge field of view, reduce the image compression degree of the edge field of view, and improve the resolution of the edge field of view.

[0075] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -1.5 < f5 / f6 < -0.5. Meeting the above conditions is conducive to the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0076] In some embodiments, the focal length f7 of the seventh lens and the focal length f8 of the eighth lens satisfy: -1.3 < f7 / f8 < -0.5. Meeting the above conditions is conducive to the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0077] In some embodiments, the effective aperture DM11 of the object side of the first lens and the effective aperture DM92 of the image side of the ninth lens satisfy: 2.2 < DM11 / DM92 < 3.2. Meeting the above conditions can make the lens have a larger entrance aperture. While ensuring that as much light as possible enters the system, it increases the area of light entering the imaging surface, which is conducive to achieving the balance of large image surface and large aperture of the lens.

[0078] In some embodiments, the combined focal length fb of the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens and the effective focal length f of the optical lens satisfy: 2 < fb / f < 4. Meeting the above conditions, by reasonably distributing the focal length of the rear lens group of the diaphragm, it is conducive to balancing the distortion and astigmatism generated by the front lens of the optical lens, and improving the imaging quality of the optical lens.

[0079] In some embodiments, the optical lens satisfies the conditional expressions: 1.9 mm < f < 2.1 mm, 17 mm < TTL < 18.5 mm, 190° < FOV < 210°, Fno < 2.1; 6 mm < IH < 7 mm; where f represents the effective focal length of the optical lens, TTL represents the overall optical length of the optical lens, FOV represents the maximum field of view angle of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention is conducive to achieving the ultra-wide angle characteristic, so as to obtain more scene information and meet the requirements of large-range detection of the optical lens; it indicates that the lens has a smaller overall optical length; it is beneficial to increase the light input amount of the lens, so that the lens can also achieve high-definition imaging in a dim environment at night; it indicates that the lens has a larger imaging surface and can be matched with a larger-size chip to achieve high-definition imaging.

[0080] In some embodiments, the nine lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic hybrid material matching structure. Preferably, the optical lens of the present invention adopts a nine-piece glass-plastic hybrid matching lens structure. Specifically, the first lens and the fourth lens can adopt glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are all plastic lenses; adopting a glass-plastic hybrid structure can improve the thermal stability performance, effectively reduce costs, correct aberrations, reduce the volume, and provide an optical lens product with higher cost performance.

[0081] In some example embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, in the optical lens provided by the present invention, the first lens and the fourth lens can adopt spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens can adopt aspherical lenses.

[0082] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0083] ;

[0084] where z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0085] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate 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.

[0086] Example 1

[0087] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens 100 includes, in sequence from the object side to the imaging surface S21 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, an eighth lens L8, a ninth lens L9 and a filter G1.

[0088] The first lens L1 has negative refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0089] The second lens L2 has negative refractive power, its object side surface S3 is concave at the near optical axis, and its image side surface S4 is concave;

[0090] The third lens L3 has negative refractive power, its object-side surface S5 is concave, and its image-side surface S6 is convex;

[0091] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0092] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface S10 is concave;

[0093] The sixth lens L6 has negative refractive power, its object-side surface S11 is convex at the near optical axis, and its image-side surface S12 is concave;

[0094] The seventh lens L7 has positive refractive power, its object-side surface S13 is convex, and its image-side surface S14 is convex;

[0095] The eighth lens L8 has negative refractive power, its object-side surface S15 is concave, and its image-side surface S16 is concave;

[0096] The ninth lens L9 has positive refractive power, its object-side surface S17 is convex, and its image-side surface S18 is concave;

[0097] The object side surface S19 and the image side surface S20 of the filter G1 are both planes;

[0098] The imaging surface S21 is a plane.

[0099] The first lens L1 and the fourth lens L4 are glass spherical lenses; the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are plastic aspherical lenses.

[0100] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0101] Table 1-1

[0102]

[0103] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0104] Table 1-2

[0105]

[0106] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0107] Figure 2 The field curvature curve in this embodiment is shown, which represents the field curvature of light on the meridional image plane and the sagittal image plane, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the 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, indicating that the optical lens 100 can well correct the field curvature.

[0108] Figure 3 The F-Theta distortion curve of this embodiment is shown, which represents the distortion of different field angles on the imaging plane, with the horizontal axis representing the distortion value (unit: %) and the vertical axis representing the field angle (unit: °). It can be seen from the figure that the distortion value is controlled within ±8%, indicating that the optical lens 100 can correct the distortion well.

[0109] Figure 4 The axial aberration curve in this embodiment 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: mm), 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 ±0.02mm, indicating that the optical lens 100 can better correct the axial aberration.

[0110] Figure 5 The vertical chromatic aberration curve in this embodiment 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 ±3 μm, indicating that the optical lens 100 can well correct the vertical chromatic aberration.

[0111] Example 2

[0112] See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0113] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0114] Table 2-1

[0115]

[0116] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0117] Table 2-2

[0118]

[0119] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 and Fig.10 shown.

[0120] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.06mm, indicating that the optical lens 200 can correct the field curvature well.

[0121] from Figure 8 It can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 200 can correct the distortion well.

[0122] from Fig. 9 It can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0123] from Fig.10It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens 200 can correct the vertical axis chromatic aberration well.

[0124] Example 3

[0125] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0127] Table 3-1

[0128]

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

[0130] Table 3-2

[0131]

[0132] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and vertical chromatic aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 and Fig.15 shown.

[0133] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.2mm, indicating that the optical lens 300 can correct the field curvature well.

[0134] from Fig.13 It can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 300 can correct the distortion well.

[0135] from Fig.14 It can be seen that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0136] from Fig.15 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens 300 can correct the vertical axis chromatic aberration well.

[0137] Example 4

[0138] See also Fig.16, shown is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main differences of this embodiment are: the object side surface S3 of the second lens L2 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0139] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0140] Table 4-1

[0141]

[0142] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0143] Table 4-2

[0144]

[0145] In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 and Fig. 20 shown.

[0146] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.05mm, indicating that the optical lens 400 can correct the field curvature well.

[0147] from Fig.18 It can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 400 can correct the distortion well.

[0148] from Fig.19 It can be seen that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0149] from Fig. 20 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3μm, indicating that the optical lens 400 can correct the vertical axis chromatic aberration well.

[0150] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0151] Table 5

[0152]

[0153] Compared with the prior art, the optical lens provided by the present invention has at least the following advantages:

[0154] (1) The optical lens provided by the present invention has a relatively compact structure through a specific surface shape setting and a reasonable optical focal length distribution, which is conducive to the miniaturization of the optical lens; it can achieve an ultra-wide angle of the lens, thereby being able to obtain more scene information and meet the needs of large-range detection of the optical lens.

[0155] (2) The optical lens provided by the present invention has a large image surface, which can be well matched with a large-size chip to ensure good resolution quality; at the same time, it can also reasonably correct the overall aberration of the optical lens, so that the optical lens has small distortion, thereby improving the imaging quality of the optical lens.

[0156] (3) The optical lens provided by the present invention adopts a glass-plastic hybrid structure, which not only makes the lens have good thermal stability, improves the stability of the lens under high and low temperature conditions, but also improves the imaging quality. It also greatly reduces the production cost of the lens, reduces the size of the lens, and better realizes the miniaturization of the lens.

[0157] 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.

[0158] 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 nine lenses, characterized in that: It successively includes from the object side to the imaging plane along the optical axis: A first lens with a negative optical power, whose object side is convex and whose image side is concave; A second lens with a negative optical power, whose image side is concave; A third lens with a negative optical power, whose object side is concave and whose image side is convex; A fourth lens with a positive optical power, whose object side is concave and whose image side is convex; A fifth lens with a positive optical power, whose object side is convex and whose image side is concave; A sixth lens with a negative optical power, whose object side is convex near the optical axis and whose image side is concave; A seventh lens with a positive optical power, whose object side is convex and whose image side is convex; An eighth lens with a negative optical power, whose object side is concave and whose image side is concave; A ninth lens with a positive optical power, whose object side is convex and whose image side is concave; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 9; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.5 < TTL / IH < 2.

8.

2. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 60° < (f × FOV) / IH < 65°.

3. 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: -6 < f1 / f < -3.5; the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -8 < f2 / f < -2.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: f3 / f < -40.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2 < f4 / f < 6; the effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: -6.5 < R7 / f < -4.

5.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 2.5 < f5 / f < 4; the effective focal length f of the optical lens and the curvature radius R10 of the image side of the fifth lens satisfy: 6 < R10 / f < 18.

7. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -5 < f6 / f < -2.

8. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1 < f7 / f < 3.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: -3 < f8 / f < -1.5; the effective focal length f of the optical lens and the curvature radius R16 of the image side of the eighth lens satisfy: 1.5 < R16 / f < 4.

10. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f9 of the ninth lens satisfy: 2 < f9 / f < 18; the effective focal length f of the optical lens and the curvature radius R18 of the image side of the ninth lens satisfy: 1.5 < R18 / f < 4.

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