Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens has negative focal power, the object side surface of the third lens is a concave surface near the optical axis, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface near the optical axis; the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, the object side surface of the sixth lens is a convex surface near the optical axis, and the image side surface of the sixth lens is a concave surface near the optical axis; and the object side surface of the seventh lens is a concave surface. According to the optical lens provided by the invention, the overall aberration of the optical lens can be reasonably corrected, so that the optical lens has one or more advantages of large aperture, large target surface, miniaturization, high imaging quality and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and particularly to an optical lens. Background Art

[0002] In recent years, with the rapid iteration of the shooting function of smart phones, users' requirements for the imaging performance of mobile devices have been increasing day by day. As the core component of the mobile phone camera module, the optical lens needs to achieve comprehensive performance such as large aperture, high resolution, and large target surface adaptation within a limited space, while meeting the design requirements of miniaturization of the total lens length to adapt to the development trend of ultra-thin bodies. With the development of image sensor technology and the pursuit of higher imaging quality, the optical lens usually adopts a multi-lens structure solution. Among them, the seven-lens structure lens has gradually become the mainstream design solution. However, how to synergistically optimize the F / 1.68 ultra-large aperture, adapt to large target surface sensors above 1 / 1.3 inches, and achieve higher imaging resolution under a compact optical architecture is still a technical difficulty that needs to be broken through in this field. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide an optical lens, which has one or more advantages such as large aperture, large target surface, miniaturization, and high imaging quality.

[0004] The technical solution adopted by the present invention is as follows: An optical lens, comprising a total of seven lenses, which are sequentially arranged from the object side to the imaging surface along the optical axis: A first lens with positive optical power, the object side surface of which is convex, and the image side surface of which is concave near the optical axis; A second lens with positive optical power, the object side surface of which is convex, and the image side surface of which is convex; A third lens with negative optical power, the object side surface of which is concave near the optical axis, and the image side surface of which is concave; A fourth lens with positive optical power, the object side surface of which is convex near the optical axis; A fifth lens with positive optical power, the object side surface of which is concave, and the image side surface of which is convex; A sixth lens with negative optical power, the object side surface of which is convex near the optical axis, and the image side surface of which is concave near the optical axis; A seventh lens with negative optical power, the object side surface of which is concave; Wherein, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -1.6 < f3 / f < -1.4; 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: -2 < R3 / R4 < -0.4; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -5.4 < R5 / R6 < -0.7.

[0005] More preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 1.1 < f1 / f < 1.3; the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.6 < f2 / f < 1.8.

[0006] More preferably, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 1.8 < ET2 / CT2 < 2.5; the central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 0.5 < ET3 / CT3 < 0.7.

[0007] More preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 5 < f4 / f < 13.

[0008] More preferably, the object-side curvature radius R3 of the second lens and the image-side curvature radius R4 of the second lens satisfy: -0.5 < (R3 + R4) / (R3 - R4) < 0.4; the object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy: -0.2 < (R5 + R6) / (R5 - R6) < 0.7.

[0009] More preferably, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -1.2 < f2 / f3 < -1.1.

[0010] More preferably, the overall 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: 0.6 < TTL / IH < 0.65.

[0011] More preferably, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis respectively satisfy: 0.5 < ∑CT / TTL < 0.57.

[0012] More preferably, the true image height IH corresponding to the maximum field of view angle of the optical lens and the F-number Fno of the optical lens satisfy: 7.3 mm < IH / Fno < 7.8 mm.

[0013] More preferably, the central thickness CT6 of the sixth lens on the optical axis and the sagitta SAG61 corresponding to the maximum clear aperture radius on the object side of the sixth lens satisfy: 0.9 < CT6 / |SAG61| < 1.2.

[0014] Compared with the prior art, the optical lens provided by the present invention has a small volume through specific surface shape settings and reasonable optical power distribution; it can also achieve a large image height of the lens, can be matched with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; it enables the lens to have a large aperture, and can achieve high-definition imaging even in a dim environment; it can also reasonably correct the overall aberration of the optical lens, enabling the optical lens to have high pixels and improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein: Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 is the axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 is the lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 is the distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0020] Figure 6 is the axial aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 is the lateral chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 is the distortion curve diagram of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 is a schematic structural diagram of the optical lens in Embodiment 3 of the present invention.

[0024] Figure 10 is the axial aberration curve diagram of the optical lens in Embodiment 3 of the present invention.

[0025] Figure 11 is the lateral chromatic aberration curve diagram of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 is the distortion curve diagram of the optical lens in Embodiment 3 of the present invention.

[0027] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0028] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

[0029] It should be noted that in this specification, the expressions such as 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 teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0030] In the drawings, for ease of illustration, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0031] In this document, 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 being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0032] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning 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.

[0034] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0035] The optical lens provided by the embodiment of the present invention has a total of seven lenses, which are, 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, and a seventh lens.

[0036] In some embodiments, the first lens may have a positive focal power, its object side is convex, and its image side is concave near the optical axis. The second lens may have a positive focal power, its object side is convex, and its image side is convex. The third lens may have a negative focal power, its object side is concave near the optical axis, and its image side is concave. The fourth lens may have a positive focal power, its object side is convex near the optical axis, and its image side may be concave or convex. The fifth lens may have a positive focal power, its object side is concave, and its image side is convex. The sixth lens may have a negative focal power, its object side is convex near the optical axis, and its image side is concave near the optical axis. The seventh lens may have a negative focal power, its object side is concave, and its image side may be concave or convex.

[0037] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image.

[0038] In some embodiments, the optical lens may further include a filter, and the filter may be disposed between the seventh 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.

[0039] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -1.6 < f3 / f < -1.4. Meeting the above conditions, the negative lens of the third lens can adjust the angle of the principal ray and reduce the barrel distortion of the wide-angle lens.

[0040] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -2 < R3 / R4 < -0.4. Meeting the above conditions, the second lens has a strong positive optical power, which can offset the spherical aberration generated by the first lens.

[0041] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -5.4 < R5 / R6 < -0.7. Meeting the above conditions, the third lens can balance the field curvature of the system, avoid deterioration of the edge image quality, and meet the requirements of a large field of view (such as ultra-wide angle or main camera) of the mobile phone lens.

[0042] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: 1.1 < f1 / f < 1.3. Meeting the above conditions, the first lens moderately converges, which can balance the aberration contributions of the front group and the rear group, and avoid deterioration of the image quality in the edge field of view.

[0043] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.6 < f2 / f < 1.8. Meeting the above conditions, the light path direction can be controlled, providing a more reasonable light incident angle for the subsequent lenses, and reducing astigmatism and field curvature.

[0044] In some embodiments, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 1.8 < ET2 / CT2 < 2.5; the central thickness CT3 of the third lens on the optical axis and the edge thickness ET3 of the third lens satisfy: 0.5 < ET3 / CT3 < 0.7. For the second lens and the third lens meeting the above conditions, the curvature combination of the biconvex and biconcave lenses can reduce the field curvature and ensure clear imaging at both the center and the edge.

[0045] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 5 < f4 / f < 13. Meeting the above conditions, by reasonably setting the focal length of the fourth lens, it is beneficial for the smooth transition of light, facilitating the correction of astigmatism and field curvature, improving the imaging quality of the optical lens, and ensuring the stability of the optical system.

[0046] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -0.5 < (R3 + R4) / (R3 - R4) < 0.4; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: -0.2 < (R5 + R6) / (R5 - R6) < 0.7. Meeting the above conditions, the radius of curvature of the object side surface and the image side surface of the second and third lenses near the optical axis are reasonably controlled, which is beneficial for controlling the shapes of the second and third lenses, optimizing the aberration balance of the lens group, and improving the imaging quality.

[0047] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -1.2 < f2 / f3 < -1.1. Meeting the above conditions can enable the second lens and the third lens to form chromatic aberration compensation, and contribute to compressing the system length and balancing the field curvature.

[0048] 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 of the optical lens satisfy: 0.6 < TTL / IH < 0.65. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same overall length of the lens, it has a larger image plane and can match a larger-sized imaging chip to achieve high-definition imaging.

[0049] In some embodiments, the overall optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the seventh lens on the optical axis respectively satisfy: 0.5 < ∑CT / TTL < 0.57. Meeting the above conditions can effectively compress the overall length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

[0050] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the aperture value Fno of the optical lens satisfy: 7.3mm < IH / Fno < 7.8mm. Meeting the above conditions can, while maintaining a large image plane for the optical lens, ensure that the optical lens has a large aperture, achieving an equilibrium between a large image plane and a large aperture.

[0051] In some embodiments, the central thickness CT6 of the sixth lens on the optical axis and the sagittal height SAG61 corresponding to the maximum clear aperture radius of the object side surface of the sixth lens satisfy: 0.9 < CT6 / |SAG61| < 1.2. Meeting the above conditions can control the surface shape of the object side surface of the sixth lens, which is beneficial to the manufacturing and shaping of the sixth lens and reduces the defect rate. In addition, it can also prevent the surface shape from being too curved and complex, making the system field curvature tend to be balanced.

[0052] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1 < f5 / f < 1.4. Meeting the above conditions, the fifth lens has a positive optical power, which can further focus the light, optimize the imaging quality, and correct the remaining aberrations (such as distortion, chromatic aberration, etc.), thereby ensuring the imaging clarity and color reproducibility.

[0053] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -17 < f6 / f < -3. Meeting the above conditions, by setting the sixth lens to have a large negative optical power, the incident light can be diverged to a large extent, causing the peripheral light and the central light to turn upwards and reach a higher imaging position, better achieving large target surface imaging of the lens and improving the imaging quality.

[0054] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -1 < f7 / f < -0.5. Meeting the above conditions, the seventh lens can extend the light convergence point and increase the BFL; and can avoid too large an angle of marginal rays and match the sensor CRA.

[0055] 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: -4.7 < (R7 + R8) / (R7 - R8) < -0.85. Meeting the above conditions can reduce the light deflection angle, make the light path more stable; at the same time, it can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0056] In some embodiments, the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 3.5 < |R14 / f| < 17. Meeting the above conditions is beneficial to alleviating the deflection degree of light passing through the lens and can well reduce aberration.

[0057] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.6 < f1 / f7 < -1.3. Meeting the above conditions, by reasonably setting the focal length ratio of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0058] In some embodiments, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM72 of the image side surface of the seventh lens satisfy: 0.35 < DM11 / DM72 < 0.4. Meeting the above conditions, by reasonably setting the aperture ratio of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0059] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 3 < IH / EPD < 3.5. Meeting the above conditions enables the optical lens to meet the large image surface while also ensuring sufficient image surface brightness in the marginal field of view, preventing vignetting, and thus enhancing the imaging quality.

[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: 0.98 < (2×f×tan(FOV / 2)) / IH < 0.99. Meeting the above conditions can make the lens have a smaller distortion value and can provide a high-definition imaging effect.

[0061] In some embodiments, the optical lens satisfies the conditional formula: 7.8mm < TTL < 8mm; 87° < FOV < 88°; 12mm < IH < 13mm; 1.6 < Fno < 1.7; where TTL represents the total optical length of the optical lens, FOV represents the maximum field of view angle of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, and Fno represents the aperture value of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least a short total length, while achieving the characteristics of a large aperture, a large target surface, and high quality, compressing the total optical length, which is beneficial to the realization of the miniaturization and light weight of the device; having a large field of view angle, providing a wider shooting field of view for the mobile phone lens and capturing more image information; having a large image height, being able to adapt to a large target surface sensor with a size larger than 1 / 1.3 inches, and improving the imaging quality; having a large aperture, further increasing the light input of the lens among the seven lenses, and providing greater possibilities for the mobile phone lens to achieve high-quality imaging and optical image stabilization.

[0062] 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. On the other hand, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also enables the structure of the lens to be relatively compact, and can better achieve the balance of the miniaturization and high image quality of the lens.

[0063] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt 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, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention can all adopt aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0064] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shape of the aspherical lens satisfies the following equation: ; where z is the sagitta of the distance from the vertex of the aspherical surface at the position with a height of h along the optical axis direction of the aspherical surface, c is the paraxial curvature of the surface, k is the conic coefficient, and A 2i is the aspherical surface type coefficient of the 2i-th order.

[0065] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. 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.

[0066] Embodiment 1 Please refer to Figure 1 , which shows a schematic structural diagram of an optical lens 100 provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a diaphragm ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0067] Among them, the first lens L1 has a positive optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface near the optical axis. The second lens L2 has a positive optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a convex surface. The third lens L3 has a negative optical power. Its object side surface S5 is a concave surface near the optical axis, and its image side surface S6 is a concave surface. The fourth lens L4 has a positive optical power. Its object side surface S7 is a convex surface near the optical axis, and its image side surface S8 is a convex surface. The fifth lens L5 has a positive optical power. Its object side surface S9 is a concave surface, and its image side surface S10 is a convex surface. The sixth lens L6 has a negative optical power. Its object side surface S11 is a convex surface near the optical axis, and its image side surface S12 is a concave surface near the optical axis. The seventh lens L7 has a negative optical power. Its object side surface S13 is a concave surface, and its image side surface S14 is a convex surface. Both the object side surface S15 and the image side surface S16 of the filter G1 are flat surfaces. The imaging surface S17 is a flat surface.

[0068] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 all adopt plastic aspherical lenses.

[0069] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0070] Table 1-1 The surface type parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0071] Table 1-2 In this embodiment, the axial aberration curve graph, the lateral chromatic aberration curve graph, and the distortion curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 shown.

[0072] Figure 2 shows the axial aberration curve graph of Embodiment 1, which represents the aberration on the optical axis at the imaging plane for each wavelength. The horizontal axis represents the axial aberration value (unit: mm), 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 ±0.04 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0073] Figure 3 shows the lateral chromatic aberration curve graph of Embodiment 1, which represents the chromatic aberration at different image heights on the imaging plane for each wavelength relative to the central wavelength (550 nm). The horizontal axis represents the 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 chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±4 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0074] Figure 4 shows the distortion curve graph of Embodiment 1, which represents the distortion of light rays with different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the image height (unit: mm). It can be seen from the figure that the distortion of the optical lens is controlled within 0 - 3%, indicating that the optical lens 100 can correct the distortion well.

[0075] Embodiment 2 Please refer to Figure 5 , which shows the structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main differences are: the image side S8 of the fourth lens L4 is concave near the optical axis; the image side S14 of the seventh lens L7 is concave near the optical axis; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0076] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0077] Table 2-1 The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0078] Table 2-2 In this embodiment, the axial aberration curve graph, lateral color aberration curve graph, and distortion curve graph of the optical lens 200 are respectively as shown in Figure 6 , Figure 7 , Figure 8 .

[0079] It can be seen from Figure 6 that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0080] It can be seen from Figure 7 that the color aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can correct the color aberration well.

[0081] It can be seen from Figure 8 that the distortion of the optical lens is controlled within -1% to 3%, indicating that the optical lens 200 can correct the distortion well.

[0082] Embodiment 3 Please refer to Figure 9 , which shows the structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main difference is that: the image side surface S8 of the fourth lens L4 is concave at the near optical axis; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0083] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0084] Table 3-1 The aspheric lens surface type parameters of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0085] Table 3-2 In this embodiment, the axial aberration curve graph, lateral color aberration curve graph, and distortion curve graph of the optical lens 300 are respectively as shown in Figure 10 , Figure 11 , Figure 12 .

[0086] It can be seen from Figure 10 that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0087] It can be seen from Figure 11It can be seen that the color difference between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0088] From Figure 12 It can be seen that the distortion of the optical lens is controlled within 0-3%, indicating that the optical lens 300 can correct distortion well.

[0089] Please refer to Table 4 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, the overall optical length TTL, the aperture value Fno, the true image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV, the chief ray angle of incidence CRA at the maximum image height, and the values corresponding to each conditional formula in each embodiment.

[0090] Table 4 Combining the above embodiments, the optical lens provided by the present invention has at least the following advantages: The optical lens provided by the present invention, through specific surface shape settings and reasonable optical power distribution, makes the lens have a small volume; it can also achieve a large image height of the lens, can be paired with a large target surface chip, which is beneficial to improving the lens resolution and the detail restoration degree of the image; makes the lens have a large aperture, and can achieve high-definition imaging even in a dim environment; can also reasonably correct the overall aberration of the optical lens, make the optical lens have high pixels, and improve the imaging quality of the optical lens.

[0091] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: 依次包括从物侧到成像面沿光轴的: 第一透镜,具有正光焦度,其物侧面是凸面,其像侧面在近光轴处是凹面; 第二透镜,具有正光焦度,其物侧面是凸面,其像侧面是凸面; 第三透镜,具有负光焦度,其物侧面在近光轴处是凹面,其像侧面是凹面; 第四透镜,具有正光焦度,其物侧面在近光轴处是凸面; 第五透镜,具有正光焦度,其物侧面是凹面,其像侧面是凸面; 第六透镜,具有负光焦度,其物侧面在近光轴处是凸面,其像侧面在近光轴处是凹面; 第七透镜,具有负光焦度,其物侧面是凹面; 其中,所述第三透镜的焦距f3与所述光学镜头的有效焦距f满足:-1.6 < f3 / f < -1.4;所述第二透镜的物侧面曲率半径R3与所述第二透镜的像侧面曲率半径R4满足:-2 < R3 / R4 < -0.4;所述第三透镜的物侧面曲率半径R5与所述第三透镜的像侧面曲率半径R6满足:-5.6 < R5 / R6 < -0.7。 2. The optical lens according to claim 1, characterized in that: 所述第一透镜的焦距f1与所述光学镜头的有效焦距f满足:1.1 < f1 / f < 1.3;所述第二透镜的焦距f2与所述光学镜头的有效焦距f满足:1.6 < f2 / f < 1.8。 3. The optical lens according to claim 1, characterized in that: 所述第二透镜在光轴上的中心厚度CT2与所述第二透镜的边缘厚度ET2满足:1.8 < ET2 / CT2 < 2.5;所述第三透镜在光轴上的中心厚度CT3与所述第三透镜的边缘厚度ET3满足:0.5 < ET3 / CT3 < 0.7。 4. The optical lens according to claim 1, characterized in that: 所述第四透镜的焦距f4与所述光学镜头的有效焦距f满足:5 < f4 / f < 13。 5. The optical lens according to claim 1, characterized in that: 所述第二透镜的物侧面曲率半径R3与所述第二透镜的像侧面曲率半径R4满足:-0.5 < (R3 + R4) / (R3 - R4) < 0.4;所述第三透镜的物侧面曲率半径R5与所述第三透镜的像侧面曲率半径R6满足:-0.2 < (R5 + R6) / (R5 - R6) < 0.7。 6. The optical lens according to claim 1, characterized in that: 所述第二透镜的焦距f2与所述第三透镜的焦距f3满足:-1.2 < f2 / f3 < -1.1。 7. The optical lens according to claim 1, characterized in that: 所述光学镜头的光学总长TTL与所述光学镜头的最大视场角所对应的真实像高IH满足:0.6 < TTL / IH < 0.65。 8. The optical lens according to claim 1, characterized in that: 所述光学镜头的光学总长TTL与所述第一透镜至所述第七透镜分别在光轴上的中心厚度的总和∑CT满足:0.5 < ∑CT / TTL < 0.57。 9. The optical lens according to claim 1, characterized in that: 所述光学镜头的最大视场角所对应的真实像高IH与所述光学镜头的光圈值Fno满足:7.3mm < IH / Fno < 7.8mm。 10. The optical lens according to claim 1, characterized in that: The center thickness CT6 of the sixth lens on the optical axis and the vector height SAG61 corresponding to the maximum light transmission semi-aperture of the object side of the sixth lens satisfy: 0.9 <CT6 / |SAG61|<1.2。

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