Optical lens

Abstract

The application provides an optical lens, which comprises nine lenses in sequence along an optical axis from an object side to an imaging surface, and comprises the following: a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with positive optical power, the object side of which is a convex surface and the image side of which is a concave surface; a fourth lens with positive optical power, the object side of which is a concave surface and the image side of which is a convex surface; a fifth lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a sixth lens with negative optical power; a seventh lens with positive optical power; an eighth lens with positive optical power; and a ninth lens with positive optical power. The optical lens provided by the application has one or more advantages of short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, low sensitivity and the like through specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of unmanned aerial vehicles, security, automobiles, weather, medical treatment, VR, AR and other fields, higher and higher requirements are put forward for the field of view of the lenses carried thereby. Wide-angle lenses can compress the edge field of view light as much as possible by introducing barrel distortion, thereby realizing ultra-wide-angle lenses. At present, there are still many problems in ultra-wide-angle lenses, for example, the common ultra-wide-angle lens has a small aperture, which can cause insufficient light entering the lens, unclear imaging in dark environments, and other problems such as large distortion, large aberration correction difficulty, and defocus in high and low temperature environments. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0004] The present application provides an optical lens, which has nine lenses, and comprises, along the optical axis from the object side to the imaging surface:

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

[0006] The second lens has negative focal power, the object side surface is convex, and the image side surface is concave;

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

[0008] The fourth lens has positive focal power, the object side surface is concave, and the image side surface is convex;

[0009] The fifth lens has positive focal power, the object side surface is convex, and the image side surface is convex;

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

[0011] The seventh lens has positive focal power, and the image side surface is convex;

[0012] The eighth lens has positive focal power, the object side surface is convex near the optical axis, and the image side surface is concave;

[0013] The ninth lens has positive focal power, the object side surface is convex near the optical axis, and the image side surface is concave near the optical axis;

[0014] Wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3.7<IH / f<3.9.

[0015] Further preferably, the total track length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 7mm < TTL / Fno < 9.1mm.

[0016] Further preferably, the maximum field of view FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3.8 < FOV / CRA < 5.6.

[0017] Further preferably, the total track length TTL of the optical lens and the sum of the central thicknesses of the first lens to the ninth lens along the optical axis respectively ∑CT satisfy: 1.4 < TTL / ∑CT < 1.8.

[0018] Further preferably, the object side half entrance pupil radius CSD31 of the third lens and the object side half entrance pupil height SAG31 of the third lens satisfy: 2.3 < CSD31 / SAG31 < 2.9.

[0019] Further preferably, the focal length f1 of the first lens, the object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: -0.45 < f1 / (R1+R2) < -0.25.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.1 < f7 / f < 8.7.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 20 < f8 / f < 50.

[0022] Further preferably, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.97 < f5 / f6 < -0.94.

[0023] Further preferably, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 8 < (f3+f4+f5) / f < 13.

[0024] Compared with the prior art, the optical lens provided by the present application adopts nine lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, low sensitivity, etc. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 1 The structure schematic diagram of the optical lens in the embodiment 1 of the present application.

[0027] Figure 2 The F-Theta distortion curve diagram of the optical lens in the embodiment 1 of the present application.

[0028] Figure 3 The field curvature curve diagram of the optical lens in the embodiment 1 of the present application.

[0029] Figure 4 The axial chromatic aberration curve diagram of the optical lens in the embodiment 1 of the present application.

[0030] Figure 5 The structure schematic diagram of the optical lens in the embodiment 2 of the present application.

[0031] Figure 6 The F-Theta distortion curve diagram of the optical lens in the embodiment 2 of the present application.

[0032] Figure 7 The field curvature curve diagram of the optical lens in the embodiment 2 of the present application.

[0033] Figure 8 The axial chromatic aberration curve diagram of the optical lens in the embodiment 2 of the present application.

[0034] Figure 9 The structure schematic diagram of the optical lens in the embodiment 3 of the present application.

[0035] Figure 10 The F-Theta distortion curve diagram of the optical lens in the embodiment 3 of the present application.

[0036] Figure 11 The field curvature curve diagram of the optical lens in the embodiment 3 of the present application.

[0037] Figure 12 The axial chromatic aberration curve diagram of the optical lens in the embodiment 3 of the present application.

[0038] The following detailed description will further describe the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0039] For a better understanding of the present application, various aspects of the present application will be presented in more detail by referring to the attached drawings. It should be understood that these detailed descriptions are merely descriptive of the embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like drawing reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that the expressions first, second, third and the like in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation of the features. Thus, the first lens discussed below can also be referred to as a second lens or a third lens without departing from the teachings of the present application.

[0041] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0042] In this specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0043] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the word "exemplary" is intended to mean an example or an illustration.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0045] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments 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.

[0046] The optical lens provided by the embodiment of the present invention has a total of nine lenses. The optical lens sequentially includes: 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 along the optical axis from the object side to the imaging surface.

[0047] In some embodiments, the first lens may have a negative optical power, its object side is convex, and its image side is concave. The second lens may have a negative optical power, its object side is convex, and its image side is concave. The third lens may have a positive optical power, its object side is convex, and its image side is concave. The fourth lens may have a positive optical power, its object side is concave, and its image side is convex. The fifth lens may have a positive optical power, its object side is convex, and its image side is convex. The sixth lens may have a negative optical power, its object side may be concave or convex, and its image side is concave. The seventh lens may have a positive optical power, its object side may be concave or convex, and its image side is convex. The eighth lens may have a positive optical power, its object side is convex near the optical axis, and its image side is concave. The ninth lens may have a positive optical power, its object side is convex near the optical axis, and its image side is concave near the optical axis.

[0048] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the fourth lens and the fifth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. When the aperture is located between the fourth lens and the fifth lens, it is convenient for the correction of aperture aberration.

[0049] 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.

[0050] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3.7 < IH / f < 3.9. By satisfying the above conditional formula, controlling the ratio of the effective focal length to the image height of the optical lens, shortening the effective focal length can expand the field angle, enabling the optical lens to capture a wider object-side space, and at the same time enabling the optical lens to match a large-image-plane chip, improving the imaging quality of the optical lens.

[0051] In some embodiments, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 7mm < TTL / Fno < 9.1mm. By satisfying the above conditional formula, by controlling the relationship between the total length and the aperture value of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturization design, enabling the optical lens to obtain sufficient light transmission in a dim environment and meeting the needs of high-quality and high-definition shooting.

[0052] In some embodiments, the maximum field of view FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3.8 < FOV / CRA < 5.6. By satisfying the above conditional formula, incident light rays at different field angles of the optical lens can enter the image sensor at appropriate angles, thereby improving the photosensitive performance of the image sensor and the imaging quality of the optical lens.

[0053] 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 ninth lens along the optical axis satisfy: 1.4 < TTL / ∑CT < 1.8. By satisfying the above conditional formula, reasonably configuring the total optical length of the optical lens and the sum of the thicknesses of each lens helps to achieve high pixel characteristics and improve the imaging quality of the optical lens; at the same time, it can effectively shorten the total optical length of the optical lens and meet the requirements of miniaturization and lightweight design.

[0054] In some embodiments, the clear aperture semi-diameter CSD31 of the object side surface of the third lens and the sagittal height SAG31 of the clear aperture semi-diameter of the object side surface of the third lens satisfy: 2.3 < CSD31 / SAG31 < 2.9. By satisfying the above conditional formula, by adjusting the surface shape of the edge region of the object side surface of the third lens, the ghost reflection energy can be reduced and the field curvature can be optimized, improving the imaging quality of the optical lens.

[0055] In some embodiments, the focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.45 < f1 / (R1 + R2) < -0.25. By satisfying the above conditional formula, the surface shapes of the object side surface and the image side surface of the first lens can be constrained, which is beneficial to reducing the bending degree of light rays at the image side surface of the first lens and reducing the astigmatism of the optical lens to balance the astigmatism problem brought by the large field of view of the optical lens, so that the astigmatism is not too large while the optical lens has a large field of view, thereby ensuring that the optical lens has excellent imaging quality.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.1 < f7 / f < 8.7. By satisfying the above conditional formula, reasonably controlling the focal length value of the seventh lens makes the light ray trend gentle, which is beneficial to the divergence of light rays while achieving the apochromatic function and is beneficial to ensuring the tolerance performance.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 20 < f8 / f < 50. Satisfying the above conditional formula and setting the second-to-last lens of the optical lens to have a positive optical power is conducive to the gentle transition of light, correcting chromatic aberration, improving the resolution ability of the optical lens, and improving the imaging quality.

[0058] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.97 < f5 / f6 < -0.94. Satisfying the above conditional formula and restricting the effective focal lengths of the fifth lens and the sixth lens can effectively correct the spherical aberration and axial chromatic aberration of the optical lens, improve the resolution of the optical lens; it can also better achieve the characteristic of eliminating temperature drift, contribute to the thermal compensation of the optical lens, and thus enable the optical lens to have good temperature performance.

[0059] In some embodiments, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 8 < (f3 + f4 + f5) / f < 13. Satisfying the above conditional formula can effectively control the depth of field of the optical lens, make the depth of field of the short-focal-length optical lens larger, enable objects within a large range to remain relatively clear, and can also effectively eliminate chromatic aberration.

[0060] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.2 < f5 / f < 2.3. Satisfying the above conditional formula and configuring sufficient positive optical power in the middle of the optical lens is conducive to controlling the angle of light, improving the photosensitive performance of the photosensitive element, and improving the resolution; at the same time, it is also conducive to correcting the aberration generated by the refraction of light by the front lens and ensuring the imaging quality.

[0061] In some embodiments, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens and the overall optical length TTL of the optical lens satisfy: 0.32 < (CT1 + CT2 + CT3 + CT4) / TTL < 0.42. Satisfying the above conditional formula can effectively control the relationship between the overall length of the optical lens and the thickness of some lenses, and ensure that the thickness tolerance of the optical lens has a low sensitivity, improving the assembly yield.

[0062] In some embodiments, the sagittal height SAG11 of the clear aperture semi-diameter on the object side of the first lens and the central thickness CT1 of the first lens satisfy: 0.7 < SAG11 / CT1 < 2.3. By satisfying the above conditional formula and controlling the ratio of the sagittal height of the object side of the first lens to the central thickness of the first lens on the optical axis, the surface shape of the object side can be made to tend to be curved and the sagittal height can be relatively large. This is conducive to the first lens collecting light rays in a large field of view, achieving high angular resolution at the center of the optical lens, and thus improving the imaging quality of the central region.

[0063] In some embodiments, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.4 < f / EPD < 1.9. By satisfying the above conditional formula and controlling the ratio of the effective focal length of the optical lens to the entrance pupil diameter, it helps to improve the light receiving ability of the optical lens, obtain as much object space information as possible, and thus obtain imaging information with higher brightness and resolution.

[0064] In some embodiments, the optical lens satisfies the following conditional formula: 1.2 mm < f < 1.6 mm; 150° ≤ FOV < 220°; 0.8 mm < EPD < 1 mm; 12 mm < TTL < 13.5 mm; 1.4 < Fno < 1.9; 4.8 mm < IH < 6 mm; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the image height corresponding to the maximum field of view angle of the optical lens. By satisfying the above conditional formula, the optical lens has at least one or more advantages such as short focal length, large field of view angle, large entrance pupil diameter, short total length, large aperture, large target surface, low distortion, and low sensitivity.

[0065] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens and the fourth lens in the optical lens provided by the present invention can adopt glass materials, 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 plastic materials. By adopting a glass-plastic hybrid structure, the cost can be effectively reduced, the aberration can be corrected, the volume can be reduced, the thermal stability performance can be improved, and an optical lens product with higher cost performance can be provided.

[0066] In some embodiments, the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first and fourth lenses of this invention are spherical lenses; the second, third, fifth, sixth, seventh, eighth, and ninth lenses are aspherical lenses.

[0067] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0068] ;

[0069] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, H, I, and J are the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth, and twentieth order surface coefficients, respectively.

[0070] The present invention will be further described below with reference to several 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 tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0071] Example 1

[0072] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane S21, the following components in sequence: 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.

[0073] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0074] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0075] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0076] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0077] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side S10 is convex.

[0078] The sixth lens L6 has negative optical power, its object side S11 is convex near the optical axis, and its image side S12 is concave.

[0079] The seventh lens L7 has positive optical power, its object side S13 is convex, and its image side S14 is convex.

[0080] The eighth lens L8 has positive optical power, its object side S15 is convex near the optical axis, and its image side S16 is concave.

[0081] The ninth lens L9 has positive optical power, its object side S17 is convex near the optical axis, and its image side S18 is concave near the optical axis.

[0082] The object-side surface S19 and the image-side surface S20 of filter G1 are both planar.

[0083] The imaging plane S21 is a plane.

[0084] 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 all plastic aspherical lenses.

[0085] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0086] Table 1-1

[0087]

[0088] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0089] Table 1-2

[0090]

[0091] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0092] Figure 2 The F-Theta distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion at different field-of-view angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion value is controlled within 0~20%, indicating that the optical lens 100 can correct distortion well.

[0093] Figure 3 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the field curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.05 mm, indicating that the optical lens 100 can correct the field curvature well.

[0094] Figure 4 The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1 μm to 3 μm, indicating that the optical lens 100 can effectively correct transverse chromatic aberration.

[0095] Example 2

[0096] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S11 of the sixth lens L6 is concave; the object side surface S13 of the seventh lens L7 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0097] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0098] Table 2-1

[0099]

[0100] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0101] Table 2-2

[0102]

[0103] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 ,Figure 7 , Figure 8 As shown.

[0104] from Figure 6 As can be seen, the distortion value is controlled within 0~50%, indicating that the optical lens 200 can correct distortion well.

[0105] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0106] from Figure 8 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 5μm, indicating that the optical lens 200 can effectively correct transverse chromatic aberration.

[0107] Example 3

[0108] Please see Figure 9 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0109] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0110] Table 3-1

[0111]

[0112] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0113] Table 3-2

[0114]

[0115] In this embodiment, the F-Theta distortion curve, field curvature curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0116] from Figure 10 As can be seen, the distortion value is controlled within 0~20%, indicating that the optical lens 300 can correct distortion well.

[0117] from Figure 11 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.05mm to 0.06mm, indicating that the optical lens 300 can correct the field curvature well.

[0118] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 4μm, indicating that the optical lens 300 can effectively correct transverse chromatic aberration.

[0119] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0120] Table 4

[0121]

[0122] In summary, the optical lens provided by the present invention uses nine lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens. This allows the lens to have one or more advantages such as short focal length, miniaturization, large field of view, large aperture, large target surface, low distortion, and low sensitivity.

[0123] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0124] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens, comprising nine pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, successively comprise: a first lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a third lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a fourth lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fifth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the image side surface of which is a concave surface; a seventh lens with positive refractive power, the image side surface of which is a convex surface; an eighth lens with positive refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface; a ninth lens with positive refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface at the near optical axis; wherein the real image height IH corresponding to the maximum field angle of view of the optical lens and the effective focal length f of the optical lens satisfy: 3.7<IH / f<3.

9.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 7mm<TTL / Fno<9.1mm.

3. The optical lens of claim 1, wherein, The maximum field angle of view FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 3.8<FOV / CRA<5.

6.

4. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the ninth lens along the optical axis satisfy: 1.4<TTL / ∑CT<1.

8.

5. The optical lens of claim 1, wherein, The object side surface half-diameter CSD31 of the third lens and the object side surface half-diameter sagittal height SAG31 of the third lens satisfy: 2.3<CSD31 / SAG31<2.

9.

6. The optical lens of claim 1, wherein, The focal length f1 of the first lens, the object side surface curvature radius R1 of the first lens, and the image side surface curvature radius R2 of the first lens satisfy: -0.45<f1 / (R1+R2)<-0.

25.

7. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 3.1<f7 / f<8.

7.

8. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f8 of the eighth lens satisfy: 20<f8 / f<50.

9. The optical lens of claim 1, wherein, The focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.97<f5 / f6<-0.

94.

10. The optical lens of claim 1, wherein, The focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, and the effective focal length f of the optical lens satisfy: 8<(f3+f4+f5) / f<13.

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