Optical lens

Abstract

The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power and a fifth 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 concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens near the optical axis is a convex surface; and the object side surface of the seventh lens is a concave surface near the optical axis, and the image side surface of the seventh lens is a convex surface. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the imaging quality of the optical lens is improved, and the lens has one or more advantages of ultra wide angle, ultra large aperture, large image plane, high pixel, 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] With the continuous improvement of people's requirements for driving experience, in-vehicle application optical lenses are increasingly used in intelligent driving, and the status of in-vehicle optical lenses in the automotive-related industry is constantly rising. In the field of vehicle driving, conventional driving recorder lenses cannot simultaneously incorporate many advantages such as a large aperture, a large wide angle, and high pixels. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an optical lens having one or more advantages such as an ultra-wide angle, an ultra-large aperture, and high pixels.

[0004] The present invention provides an optical lens, which has a total of seven lenses, and successively includes, along the optical axis from the object side to the imaging surface: A first lens with a negative optical power, whose image side is concave; A second lens with a negative optical power, whose object side is convex and whose image side is concave; A third lens with a negative optical power, whose object side is convex and whose image side is concave; A fourth lens with a positive optical power, whose image side is convex; A fifth lens with a positive optical power, whose image side is convex; A sixth lens with a negative optical power, whose object side is concave and whose image side is convex near the optical axis; A seventh lens with a negative optical power, whose object side is concave near the optical axis and whose image side is convex; Wherein, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 55° < (f × FOV) / IH < 65°.

[0005] Further preferably, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < f / EPD < 1.1.

[0006] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6 < f1 / f < -2.3.

[0007] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.4.

[0008] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -33 < f6 / f < -11.

[0009] Further preferably, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 135° < FOV / Fno < 145°.

[0010] Further preferably, the object-side curvature radius R3 of the second lens and the image-side curvature radius R4 of the second lens satisfy: 1.2 < R3 / R4 < 1.4.

[0011] Further preferably, the object-side curvature radius R13 of the seventh lens and the image-side curvature radius R14 of the seventh lens satisfy: 0.6 < R13 / R14 < 0.7.

[0012] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the aperture value Fno of the optical lens satisfy: 8mm < IH / Fno < 9mm.

[0013] Further preferably, the object-side clear aperture sagittal height SAG61 of the sixth lens, the image-side clear aperture sagittal height SAG62 of the sixth lens and the central thickness CT6 of the sixth lens satisfy: -1.9 < (SAG61 - SAG62) / CT6 < -0.9.

[0014] Compared with the prior art, the optical lens provided by the present invention adopts seven 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 aberration, improve the imaging quality of the optical lens, and enable the lens to have one or more advantages such as ultra-wide angle, super large aperture, large image plane, high pixel, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 is a field curvature curve graph of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 is an f-θ distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 is an axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 6 It is the structural schematic diagram of the optical lens in Embodiment 2 of the present invention.

[0021] Figure 7 It is the field curvature curve graph of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 It is the f-θ distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 It is the axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0024] Figure 10 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0025] Figure 11 It is the structural schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 It is the field curvature curve graph of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 It is the f-θ distortion curve graph of the optical lens in Embodiment 3 of the present invention.

[0028] Figure 14 It is the axial aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0029] Figure 15 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0030] Figure 16 It is the structural schematic diagram of the optical lens in Embodiment 4 of the present invention.

[0031] Figure 17 It is the field curvature curve graph of the optical lens in Embodiment 4 of the present invention.

[0032] Figure 18 It is the f-θ distortion curve graph of the optical lens in Embodiment 4 of the present invention.

[0033] Figure 19 It is the axial aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0034] Figure 20 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0035] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Detailed implementation manners

[0036] To better understand the present application, various aspects of the present application will be described in more detail 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.

[0037] 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.

[0038] In the accompanying drawings, for the sake of convenience of illustration, the thickness, size 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 only examples and are not drawn strictly to scale.

[0039] 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 to be 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.

[0040] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "including having", 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 an expression such as "at least one of..." appears after the 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.

[0041] 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.

[0042] 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 detail this application with reference to the drawings and in conjunction with the embodiments.

[0043] The optical lens provided by the embodiment of the present invention has a total of seven lenses. The optical lens sequentially includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens along the optical axis from the object side to the imaging surface.

[0044] In some embodiments, the first lens may have a negative focal power. Its object side surface may be concave or convex, and its image side surface is concave. The second lens may have a negative focal power. Its object side surface is convex, and its image side surface is concave. The third lens may have a negative focal power. Its object side surface is convex, and its image side surface is concave. The fourth lens may have a positive focal power. Its object side surface may be concave or convex, and its image side surface is convex. The fifth lens may have a positive focal power. Its object side surface may be concave or convex, and its image side surface is convex. The sixth lens may have a negative focal power. Its object side surface is concave, and its image side surface is convex near the optical axis. The seventh lens may have a negative focal power. Its object side surface is concave near the optical axis, and its image side surface is convex.

[0045] In some embodiments, the optical lens may further include a diaphragm. The diaphragm may be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image. When the diaphragm is located between the second lens and the third lens, it is convenient for correcting the diaphragm aberration.

[0046] In some embodiments, the optical lens may further include a filter and a protective glass. The filter and the protective glass may be sequentially disposed along the optical axis 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. The protective glass plays a role in protecting the optical lens to prevent the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0047] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 55° < (f × FOV) / IH < 65°. By satisfying the above conditional formula and 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 the large field of view angle and large target surface imaging of the optical lens, and better meet the usage requirements of wide-angle shooting of the driving recorder.

[0048] In some embodiments, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < f / EPD < 1.1. By satisfying the above conditions, by controlling the ratio of the total effective focal length to the entrance pupil diameter, the lens has the advantage of a large aperture, thereby increasing the light flux of the lens and enhancing the imaging effect of the lens in a dark environment.

[0049] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6 < f1 / f < -2.3. By satisfying the above conditions, the first lens has an appropriate negative focal length, which is beneficial to expanding the field of view angle of the optical lens.

[0050] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.4. By satisfying the above conditions, the fourth lens converges the incident light rays at the front end, which is beneficial to correcting the aberration and distortion of the edge field of view brought by the front lens group, making the lens have less distortion and capable of providing a high-definition imaging effect.

[0051] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -33 < f6 / f < -11. By satisfying the above conditions, by reasonably setting the focal length of the sixth lens, it is beneficial to 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.

[0052] In some embodiments, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 135° < FOV / Fno < 145°. By satisfying the above conditions, the lens can achieve large-angle imaging while increasing the light flux through a large aperture, recording a wider viewing angle.

[0053] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.2 < R3 / R4 < 1.4. By satisfying the above range and reasonably setting the surface shape of the second lens, the light path can be made more stable.

[0054] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.6 < R13 / R14 < 0.7. Satisfying the above range and reasonably defining the surface shape of the seventh lens helps the light to be accurately focused on the imaging plane, improving the clarity and brightness uniformity of the imaging.

[0055] In some embodiments, 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: 8 mm < IH / Fno < 9 mm. Satisfying the above conditions, while maintaining a large image plane for the optical lens, it ensures that the optical lens has a large aperture, achieving a balance between a large image plane and a large aperture.

[0056] In some embodiments, the sagittal height SAG61 of the object side surface clear aperture, the sagittal height SAG62 of the image side surface clear aperture of the sixth lens, and the central thickness CT6 of the sixth lens satisfy: -1.9 < (SAG61 - SAG62) / CT6 < -0.9. Satisfying the above conditions, by controlling the relationship between the height difference of the sagittal heights of the image side surface and the object side surface of the sixth lens and the central thickness of the sixth lens, the shape of the sixth lens can be constrained, which is beneficial to the design and processing of the sixth lens structure, beneficial to correcting the aberrations of each field of view respectively, and beneficial to improving the imaging quality of the optical lens.

[0057] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 5.8 < TTL / f < 7.5. Satisfying the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0058] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < IH / f < 2.6. Satisfying the above conditions can achieve a larger field of view angle and imaging range, and can achieve the large image plane characteristic while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system.

[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: 2.6 < TTL / IH < 3.1. Satisfying the above conditions can better achieve the miniaturization of the lens, and at the same time ensure that the lens has a larger image plane under the condition of the same total length of the lens, and can match a larger size imaging chip to achieve high-definition imaging.

[0060] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -55 < f2 / f < -14; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -320 < f3 / f < -13. Meeting the above conditions, both the second lens and the third lens are also negative lenses, which can further emit light and increase the field of view angle of the imaging system.

[0061] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.8 < f5 / f < 1. The fifth lens meeting the above conditions can further focus light, adjust the chief ray angle, optimize the imaging quality, and correct the remaining aberrations (such as distortion, chromatic aberration, etc.), reducing the distortion of the wide-angle lens.

[0062] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.6 < BFL / f < 0.9. Meeting the above range is conducive to achieving a balance between obtaining good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical lens, it can avoid interference between the lens and other components, reducing the assembly process difficulty of the camera module.

[0063] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -56 < R1 / R2 < 11. Meeting the above conditions can reasonably set the surface shape of the first lens, enhance the light collection ability of the first lens, and thus achieve an ultra-large field of view angle.

[0064] In some embodiments, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.65 < R11 / R12 < 0.8. Meeting the above conditions and reasonably setting the curvature radius of the sixth lens can correct the aberration of the optical lens and reduce the tolerance sensitivity of the optical lens.

[0065] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 6 < (R3 + R4) / (R3 - R4) < 10. Meeting the above range can make the light trend more stable.

[0066] In some embodiments, 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: 10 < (R5 + R6) / (R5 - R6) < 26. Meeting the above range can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0067] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -8.5 < (R11 + R12) / (R11 - R12) < -5.2. By satisfying the above range, the radii of curvature of the object side surface and the image side surface of the sixth lens at the near optical axis are reasonably controlled, which is beneficial to controlling the shape of the sixth lens, correcting the aberration generated by itself, and improving the imaging quality.

[0068] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -5.8 < (R13 + R14) / (R13 - R14) < -4.5. By satisfying the above range, the shapes of the object side surface and the image side surface of the seventh lens are reasonably defined, and the seventh lens can be controlled to have an appropriate surface shape, which helps to control the light trend of the edge field of view and improve the imaging quality of the edge field of view.

[0069] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: 0 < f1 / f7 < 0.2. By satisfying the above conditions, by reasonably setting the focal length relationship between the first and the last lenses in the lens, while ensuring that as much light as possible enters the system, the area of the light entering the imaging surface is increased, which is beneficial to realizing large image surface imaging of the lens, and at the same time increases the light input and improves the relative illuminance of the system.

[0070] In some embodiments, the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 0.4 < CT4 / CT5 < 0.8. By satisfying the above conditions, the ratio of the thickness of the fourth lens on the optical axis to the thickness of the fifth lens on the optical axis is reasonably configured, and the fourth lens and the fifth lens can regulate each other to maintain the characteristics of the miniaturization of the optical system.

[0071] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively and the total optical length TTL of the optical lens satisfy: 0.6 < ∑CT / TTL < 0.7. By satisfying the above conditions, the total length of the optical lens can be effectively compressed, and it is beneficial to the structural design and production process of the optical lens.

[0072] In some embodiments, the distance CT34 between the third lens and the fourth lens on the optical axis, the distance CT45 between the fourth lens and the fifth lens on the optical axis, the distance CT56 between the fifth lens and the sixth lens on the optical axis, and the distance CT67 between the sixth lens and the seventh lens on the optical axis satisfy the following relationship with the total optical length TTL of the optical lens: 0.03 < (CT34 + CT45 + CT56 + CT67) / TTL < 0.04. Meeting the above conditions ensures that the intervals between the third, fourth, fifth, sixth, and seventh lenses are not too large, thereby controlling the lens length. On the basis of meeting the miniaturization of the optical lens, the energy level of ghost images caused by reflections between lenses is reduced, achieving miniaturization and weak ghost images.

[0073] In some embodiments, the sagittal height SAG51 of the clear aperture semi-diameter on the object side of the fifth lens and the central thickness CT5 of the fifth lens satisfy: -0.3 < SAG51 / CT5 < 0.3. Meeting the above conditions is beneficial to lens manufacturing and shaping by appropriately adjusting the ratio of the sagittal height to the thickness of the fifth lens, improving the manufacturing yield, and shortening the total length of the optical lens.

[0074] In some embodiments, the sagittal height SAG71 of the clear aperture semi-diameter on the object side of the seventh lens, the sagittal height SAG62 of the clear aperture semi-diameter on the image side of the sixth lens, and the distance CT67 between the sixth lens and the seventh lens on the optical axis satisfy: 2.8 < (SAG71 - SAG62) / CT67 < 11. Meeting the above conditions is beneficial to correcting the coma of the off-axis field of view by reasonably controlling the relationship between the sagittal height of the object side of the seventh lens, the sagittal height of the image side of the sixth lens, and the air gap between the sixth lens and the seventh lens, and is beneficial to improving the imaging quality of the off-axis field of view of the optical lens.

[0075] In some embodiments, the clear aperture semi-diameter DM11 on the object side of the first lens and the clear aperture semi-diameter DM72 on the image side of the seventh lens satisfy: 1.4 < DM11 / DM72 < 1.8. Meeting the above conditions can effectively reduce the aperture size of the lens while ensuring that light enters the system within a large range, which is beneficial to achieving the balance of a large field of view and a small aperture of the lens.

[0076] 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: 2.2 < IH / EPD < 2.7. Meeting the above range enables the optical lens to meet the requirements of a large image plane while also ensuring sufficient image plane brightness in the edge field of view, preventing vignetting, and thus improving the imaging quality.

[0077] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens, the effective focal length f of the optical lens, and the radian value θ of the maximum half field of view angle of the optical lens satisfy: 0.92 < (IH / 2) / (f×θ) < 0.98. Meeting the above range can make the lens have a small distortion value and provide a high-definition imaging effect.

[0078] In some embodiments, the optical lens satisfies the conditional formula: 22mm < TTL < 27mm, 3.4mm < f < 4mm, 143° < FOV < 145°, 8.5mm < IH < 9.2mm, 1 < Fno < 1.05, 6° < CRA < 14°, where TTL represents the overall optical length of the optical lens, f represents the effective focal 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, Fno represents the aperture value of the optical lens, and CRA represents the chief ray angle of incidence CRA at the maximum image height of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least one or more advantages such as a large image plane, a large field of view angle, and a large aperture.

[0079] In some embodiments, all seven lenses in the optical lens can be made of plastic lenses or adopt a structure with a combination of glass and plastic materials. Preferably, the optical lens of the present invention adopts a structure of seven lenses with a combination of glass and plastic, which can improve the thermal stability performance. Specifically, the first lens and the fourth lens can be made of glass lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all plastic lenses; adopting a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce the volume, and provide an optical lens product with higher cost performance.

[0080] 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 aberrations 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 adopt spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens can adopt aspherical lenses.

[0081] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shapes of the aspherical surfaces of the optical lens satisfy the following equation: ; Among them, 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, and F are the conic coefficients of the fourth, sixth, eighth, tenth, and twelfth orders respectively.

[0082] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are partially 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 other 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.

[0083] Embodiment 1 Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 sequentially includes, along the optical axis from the object side to the imaging surface S19: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a protective glass G2.

[0084] Among them, the first lens L1 has a negative optical power. Its object side S1 is a convex surface, and its image side S2 is a concave surface; The second lens L2 has a negative optical power. Its object side S3 is a convex surface, and its image side S4 is a concave surface; The third lens L3 has a negative optical power. Its object side S5 is a convex surface, and its image side S6 is a concave surface; The fourth lens L4 has a positive optical power. Its object side S7 is a concave surface, and its image side S8 is a convex surface; The fifth lens L5 has a positive optical power. Its object side S9 is a convex surface, and its image side S10 is a convex surface; The sixth lens L6 has a negative optical power. Its object side S11 is a concave surface, and its image side S12 is a convex surface near the optical axis; The seventh lens L7 has a negative optical power. Its object side S13 is a concave surface near the optical axis, and its image side S14 is a convex surface; Both the object side S15 and the image side S16 of the filter G1 are flat surfaces; Both the object side S17 and the image side S18 of the protective glass G2 are flat surfaces; The imaging surface S19 is a flat surface.

[0085] The first lens L1 and the fourth lens L4 are made of glass spherical lenses; the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all made of plastic aspherical lenses.

[0086] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0087] Table 1-1 The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0088] Table 1-2 In this embodiment, the field curvature curve graph, f-θ distortion curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0089] Figure 2 shows the field curvature curve graph of the optical lens 100 in this embodiment, which represents the bending degree of light rays in 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 ±0.15 mm, indicating that the optical lens 100 can better correct the field curvature.

[0090] Figure 3 shows the f-θ distortion curve graph of the optical lens 100 in this embodiment, which represents the distortion of different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents 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 better correct the distortion.

[0091] Figure 4 shows the axial aberration curve graph of the optical lens 100 in this embodiment, 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. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.09 mm, indicating that the optical lens 100 can better correct the axial aberration.

[0092] Figure 5The vertical chromatic aberration curve graph of the optical lens 100 in this embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 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 ±8 μm, indicating that the optical lens 100 can correct chromatic aberration well.

[0093] Embodiment 2 Please refer to Figure 6 , which shows the schematic structural diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main differences are as follows: The object side surface S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0094] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0095] 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.

[0096] Table 2-2 In this embodiment, the field curvature curve graph, f-θ distortion curve graph, axial aberration curve graph, and vertical chromatic aberration curve graph of the optical lens 200 are respectively as Figure 7 , Figure 8 , Figure 9 , Figure 10 shown.

[0097] From Figure 7 it can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.15 mm, indicating that the optical lens 200 can correct field curvature well.

[0098] From Figure 8 it can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 200 can correct distortion well.

[0099] From Figure 9 it can be seen that the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 200 can correct axial aberration well.

[0100] From Figure 10 it can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0101] Example 3 Please refer to Figure 11 , which shows a schematic structural diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side S7 of the fourth lens L4 is a convex surface; the object side S9 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0103] Table 3-1 The surface type parameters of the aspherical lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0104] Table 3-2 In this embodiment, the field curvature curve graph, f-θ distortion curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 300 are respectively as shown in Figure 12 , Figure 13 , Figure 14 , Figure 15 .

[0105] It can be seen from Figure 12 that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.15 mm, indicating that the optical lens 300 can correct the field curvature well.

[0106] It can be seen from Figure 13 that the distortion value is controlled within ±10%, indicating that the optical lens 300 can correct the distortion well.

[0107] It can be seen from Figure 14 that the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0108] It can be seen from Figure 15 that the lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, indicating that the optical lens 300 can correct the chromatic aberration well.

[0109] Example 4 Please refer to Figure 16 , which shows a schematic structural diagram of the optical lens 400 provided in Embodiment 4 of the present invention. Compared with Embodiment 1, the main differences are as follows: the object side S1 of the first lens L1 is a concave surface; the object side S7 of the fourth lens L4 is a convex surface; the object side S9 of the fifth lens L5 is a concave surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0110] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0111] Table 4-1 The surface shape parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0112] Table 4-2 In this embodiment, the field curvature curve graph, f-θ distortion curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 400 are respectively as Figure 17 , Figure 18 , Figure 19 , Figure 20 shown.

[0113] From Figure 17 , it can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the field curvature well.

[0114] From Figure 18 , it can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 400 can correct the distortion well.

[0115] From Figure 19 , it can be seen that the offset of the axial aberration is controlled within ±0.08 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0116] From Figure 20 , it can be seen that the lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8 μm, indicating that the optical lens 400 can correct the chromatic aberration well.

[0117] Please refer to Table 5 for the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the true image height IH corresponding to the maximum field of view angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV, and the values corresponding to each conditional formula in each embodiment.

[0118] Table 5 Combining the above embodiments, the optical lens provided by the present invention adopts a seven-piece glass-plastic hybrid structure. Through specific surface shape settings 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, enabling the lens to have one or more advantages such as ultra-wide angle, super large aperture, large image plane, high pixel, and high imaging quality.

[0119] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean 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 expressions 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 a suitable manner in any one or more embodiments or examples.

[0120] The above-described embodiments merely represent several implementation manners of the present invention. The descriptions are relatively specific and detailed, but should not be construed as a limitation on 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 modifications 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 shall be subject to the appended claims.

Claims

1. An optical lens, consisting of seven lenses in total, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with negative optical power, whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with negative optical power, whose object side is convex and whose image side is concave; A fourth lens with positive optical power, whose image side is convex; A fifth lens with positive optical power, whose image side is convex; A sixth lens with negative optical power, whose object side is concave and whose image side is convex near the optical axis; A seventh lens with negative optical power, whose object side is concave near the optical axis and whose image side is convex; Wherein, 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: 55° < (f × FOV) / IH < 65°.

2. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < f / EPD < 1.

1.

3. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.6 < f1 / f < -2.

3.

4. The optical lens according to claim 1, wherein, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.4 < f4 / f < 2.

4.

5. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -33 < f6 / f < -11.

6. The optical lens according to claim 1, wherein The maximum field of view angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 135° < FOV / Fno < 145°.

7. The optical lens according to claim 1, wherein The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.2 < R3 / R4 < 1.

4.

8. The optical lens according to claim 1, wherein The curvature radius R13 of the object side of the seventh lens and the curvature radius R14 of the image side of the seventh lens satisfy: 0.6 < R13 / R14 < 0.

7.

9. The optical lens according to claim 1, characterized in that, 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: 8mm < IH / Fno < 9mm.

10. The optical lens according to claim 1, characterized in that, The sagittal height SAG61 of the object side clear aperture semi-diameter of the sixth lens, the sagittal height SAG62 of the image side clear aperture semi-diameter of the sixth lens, and the central thickness CT6 of the sixth lens satisfy: -1.9 < (SAG61 - SAG62) / CT6 < -0.9.

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