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 fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface near the optical axis; and the object side surface of the seventh lens is a convex surface, 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, aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of an ultra-wide angle, an ultra-large aperture, a large image plane, high pixels, high imaging quality and the like.

Description

Technical Field

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

[0002] As people's expectations for driving experience continue to rise, the use of automotive optical lenses in intelligent driving is increasing, and their status in the automotive industry is constantly improving. In the field of vehicle driving, conventional dashcam lenses cannot simultaneously combine the advantages of large aperture, wide angle, and high pixel count. Summary of the Invention

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

[0004] The present invention provides an optical lens, comprising seven lenses, which include the following lenses in order from the object side to the imaging surface along the optical axis: a first lens having negative optical power and a concave image-side surface; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; a fourth lens element having positive optical power and a convex object-side surface; a fifth lens element having positive optical power and a convex object-side surface; a sixth lens element having positive refractive power and a convex object-side surface near the optical axis; a seventh lens element having positive refractive power, whose object-side surface and image-side surface are convex; The maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy the following conditions: 130° <FOV / Fno<150°。

[0005] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2 <TTL / f<7.5。

[0006] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 55°<(f×FOV) / IH<65°.

[0007] Further preferably, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following requirements: 2.6 <TTL / IH<3。

[0008] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -1.9.

[0009] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.4 < f4 / f < 3.4.

[0010] Further preferably, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 1.7.

[0011] Further 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: 8 mm < IH / Fno < 9.2 mm.

[0012] Further preferably, the sagittal height SAG51 of the clear aperture on the object side of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.3 < SAG51 / CT5 < 0.38.

[0013] Further preferably, 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, the distance CT67 between the sixth lens and the seventh lens on the optical axis and the total optical length TTL of the optical lens satisfy: 0.01 < (CT34 + CT45 + CT56 + CT67) / TTL < 0.04.

[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 apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where: 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 It is the 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] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0031] 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.

[0032] 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, 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.

[0033] In the drawings, for ease of illustration, the thickness, dimensions, and shape of the lenses 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.

[0034] In this text, 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.

[0035] 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 an individual element 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.

[0036] 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.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0038] The optical lens provided by the embodiment of the present invention has a total of seven lenses. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0039] In some embodiments, the first lens may have a negative optical power. Its object side surface may be concave or convex, and its image side surface is concave. The second lens may have a negative optical power. Its object side surface is convex, and its image side surface is concave. The third lens may have a negative optical power. Its object side surface is convex, and its image side surface is concave. The fourth lens may have a positive optical power. Its object side surface is convex, and its image side surface may be concave or convex. The fifth lens may have a positive optical power. Its object side surface is convex, and its image side surface may be concave or convex. The sixth lens has a positive optical power. Its object side surface is convex near the optical axis, and its image side surface may be concave or convex. The seventh lens may have a positive optical power. Its object side surface is convex, and its image side surface is convex.

[0040] 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.

[0041] 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 between the seventh lens and the imaging surface along the optical axis. 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 and preventing the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0042] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130° < FOV / Fno < 150°. When the above conditions are met, the lens can achieve large-angle imaging while increasing the light flux through a large aperture, and record a wider field of view.

[0043] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2 < TTL / f < 7.5. When the above conditions are met, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0044] 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°. When the above condition formula is satisfied, by reasonably restricting the relationship between the focal length, field of view angle, and image height of the optical lens, it is beneficial to achieve the balance of large field of view angle and large target surface imaging of the optical lens, and better meet the use requirements of wide-angle shooting of a dash cam.

[0045] 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. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same total length of the lens, it has a larger image plane, can match a larger-sized imaging chip to achieve high-definition imaging.

[0046] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -1.9. Meeting 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.

[0047] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 2.4 < f4 / f < 3.4. Meeting the above conditions, by reasonably setting the focal length of the fourth lens, it is beneficial to the smooth transition of light, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system.

[0048] In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 1.7. Meeting the above conditions, the seventh lens uses a short focal length, which helps to collect light, ensures the light transmission amount, improves the relative illumination, and enhances the brightness of the optical lens at the image plane.

[0049] 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: 8 mm < IH / Fno < 9.2 mm. Meeting the above conditions, while maintaining a large image plane of the optical lens, it ensures that the optical lens has a large aperture, achieving the balance of a large image plane and a large aperture.

[0050] In some embodiments, the sagittal height SAG51 of the object side light-passing semi-aperture of the fifth lens and the central thickness CT5 of the fifth lens satisfy: 0.3 < SAG51 / CT5 < 0.38. Meeting the above conditions, by appropriately adjusting the ratio of the sagittal height to the thickness of the fifth lens, it is beneficial to the lens manufacturing and molding, improves the manufacturing yield, and shortens the total length of the optical lens.

[0051] In some embodiments, the spacing CT34 between the third lens and the fourth lens on the optical axis, the spacing CT45 between the fourth lens and the fifth lens on the optical axis, the spacing CT56 between the fifth lens and the sixth lens on the optical axis, the spacing CT67 between the sixth lens and the seventh lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0.01 < (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 reflected between lenses is reduced, achieving miniaturization and weak ghost images.

[0052] 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. Meeting the above conditions can achieve a larger field of view angle and imaging range, and can achieve the characteristics of a large image plane while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system.

[0053] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -650 < f2 / f < -24; the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -8.5 < f3 / f < -4.5. Meeting the above conditions, both the second lens and the third lens are negative lenses, which can further emit light and increase the field of view angle of the imaging system.

[0054] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 1.8 < f5 / f < 3; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 5.5 < f6 / f < 33. Meeting the above conditions, both the fifth and sixth lenses have positive optical powers, which can further focus light, adjust the angle of the chief ray, optimize the imaging quality, and correct residual aberrations (such as distortion, chromatic aberration, etc.), reducing the distortion of the wide-angle lens.

[0055] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.62 < BFL / f < 0.9. Meeting the above range is beneficial to achieving a balance between obtaining good imaging quality and an optical back focal length that is easy to assemble. While ensuring the imaging quality of the optical lens, it avoids interference between the lens and other components, reducing the assembly process difficulty of the camera module.

[0056] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: -50 < R1 / R2 < 8. Meeting the above conditions can reasonably set the surface shape of the first lens, enhance the light-gathering ability of the first lens, and thus achieve an ultra-large field of view angle.

[0057] 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: 5 < (R3 + R4) / (R3 - R4) < 6. Satisfying the above range can make the light path more stable.

[0058] 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: 2.7 < (R5 + R6) / (R5 - R6) < 6.3. Satisfying the above range can correct coma and field curvature, improve the flatness of imaging, and enhance the imaging quality of the optical lens.

[0059] 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: -11 < (R11 + R12) / (R11 - R12) < 0.15. Satisfying the above conditions can alleviate the deflection degree of light passing through the lens and effectively reduce aberration.

[0060] 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: 0.32 < (R13 + R14) / (R13 - R14) < 0.8. Satisfying the above range can reasonably define the shapes of the object side surface and the image side surface of the seventh lens, enable the seventh lens to have an appropriate surface shape, help control the light path of the marginal field of view, and improve the imaging quality of the marginal field of view.

[0061] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -3.3 < f3 / f4 < -1.6. Satisfying the above range, by reasonably setting the focal length ratio of the third lens and the fourth lens, the system length can be shortened, and the aberration and distortion of the marginal field of view can be reduced, making the lens have a small distortion and capable of providing a high-definition imaging effect.

[0062] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.7 < f1 / f7 < -1.4. Satisfying the above conditions, by reasonably setting the focal length relationship between the first and the last lens in the lens, while ensuring that as much light as possible enters the system, the area of light entering the imaging surface is increased, which is beneficial to achieving large image plane imaging of the lens, and at the same time increasing the light input and improving the relative illumination of the system.

[0063] In some embodiments, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 0.58 < CT3 / CT4 < 1. Satisfying the above conditions can reasonably configure the ratio of the thickness of the third lens on the optical axis to the thickness of the fourth lens on the optical axis. The third lens and the fourth lens can regulate each other and maintain the characteristics of miniaturization of the optical system.

[0064] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the total optical length TTL of the optical lens satisfy: 0.65 < ∑CT / TTL < 0.75. Satisfying the above conditions can effectively compress the total length of the optical lens and is beneficial to the structural design and production process of the optical lens.

[0065] In some embodiments, the sagittal height SAG21 of the clear aperture semi-diameter on the object side of the second lens and the sagittal height SAG22 of the clear aperture semi-diameter on the image side of the second lens satisfy: -0.02 < SAG21 - SAG22 < 0.65. Satisfying the above conditions, by controlling the relationship between the vector height of the image side and the sagittal height of the object side of the second lens, it is beneficial to constrain the shape of the second lens and reasonably control the lens opening angle of the second lens, thereby being beneficial to improving the processability of the lens. In addition, by reasonably constraining the lens shape of the second lens, the risk of ghosting generated by the second lens can be effectively reduced.

[0066] 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: 1.5 < DM11 / DM72 < 2. Satisfying 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.

[0067] 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 < 2.6. Satisfying the above range enables the optical lens to satisfy 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.

[0068] 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) < 0.97. Satisfying the above range can make the lens have a small distortion value and provide a high-definition imaging effect.

[0069] In some embodiments, the optical lens satisfies the conditional formula: 24mm < TTL < 36mm, 3.5mm < f < 3.9mm, 140° < FOV < 150°, 8.5mm < IH < 9.2mm, 1 < Fno < 1.1, 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, 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 one or more advantages such as a large image plane, a large field of view angle, and a large aperture.

[0070] In some embodiments, the seven lenses in the optical lens can all 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 lens structure with a combination of seven glass and plastic materials, 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.

[0071] 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, 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.

[0072] In various embodiments 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: ; where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0073] 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 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.

[0074] 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 includes, in order from the object side to the imaging surface S19 along the optical axis: 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.

[0075] Among them, the first lens L1 has a negative optical power. Its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface; The second lens L2 has a negative optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface; The third lens L3 has a negative optical power. Its object side surface S5 is a convex surface, 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, 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 convex surface, and its image side surface S10 is a convex surface; The sixth lens L6 has a positive optical power. Its object side surface S11 is a convex surface near the optical axis, and its image side surface S12 is a convex surface near the optical axis; The seventh lens L7 has a positive optical power. Its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface; The object side surface S15 and the image side surface S16 of the filter G1 are both flat surfaces; The object side surface S17 and the image side surface S18 of the protective glass G2 are both flat surfaces; The imaging surface S19 is a flat surface.

[0076] The first lens L1 and the fourth lens L4 adopt glass spherical lenses; the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 all adopt plastic aspherical lenses.

[0077] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0078] Table 1-1 The surface shape parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0079] 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.

[0080] 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 correct the field curvature well.

[0081] 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 correct the distortion well.

[0082] 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 ±0.08 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0083] Figure 5 shows the lateral chromatic aberration curve graph of the optical lens 100 in this embodiment, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the lateral 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 lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±8 μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0084] Embodiment 2 Please refer to Figure 6, which shows a 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 image side S10 of the fifth lens L5 is concave near the optical axis; the image side S12 of the sixth lens L6 is concave; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0085] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0086] Table 2-1 The surface type parameters of the aspherical lenses of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0087] Table 2-2 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 200 are respectively as Figure 7 , Figure 8 , Figure 9 , Figure 10 shown.

[0088] From Figure 7 it can be seen that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 200 can correct the field curvature well.

[0089] From Figure 8 it can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 200 can correct the distortion well.

[0090] From Figure 9 it can be seen that the offset of the axial aberration is controlled within ±0.1mm, indicating that the optical lens 200 can correct the axial aberration well.

[0091] From Figure 10 it can be seen that the lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±8μm, indicating that the optical lens 200 can correct the chromatic aberration well.

[0092] Embodiment 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 S1 of the first lens L1 is concave; the image side S8 of the fourth lens L4 is concave; the image side S10 of the fifth lens L5 is concave near the optical axis; the image side S12 of the sixth lens L6 is concave; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0093] For the optical lens 300 in Embodiment 3, the relevant parameters of each lens are shown in Table 3-1.

[0094] Table 3-1 The surface shape parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0095] 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 Figure 12 , Figure 13 , Figure 14 , Figure 15 shown.

[0096] From Figure 12 , 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 300 can correct the field curvature well.

[0097] From Figure 13 , it can be seen that the distortion value is controlled within ±8%, indicating that the optical lens 300 can correct the distortion well.

[0098] From Figure 14 , it can be seen that the offset of the axial aberration is controlled within ±0.1 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0099] From Figure 15 , 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 300 can correct the chromatic aberration well.

[0100] Please refer to Table 4 for the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the 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 expression in each embodiment.

[0101] Table 4 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 light 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.

[0102] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. 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.

[0103] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for 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 for 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 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 object side is convex; A fifth lens with a positive optical power, whose object side is convex; A sixth lens with a positive optical power, whose object side is convex near the optical axis; A seventh lens with a positive optical power, whose object side is convex and whose image side is convex; Wherein, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 130° < FOV / Fno < 150°.

2. The optical lens according to claim 1, wherein The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 6.2 < TTL / f < 7.

5.

3. The optical lens according to claim 1, 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°.

4. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 2.6 < TTL / IH < 3.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -1.

9.

6. 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: 2.4 < f4 / f < 3.

4.

7. The optical lens according to claim 1, characterized in that The effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: 1.3 < f7 / f < 1.

7.

8. The optical lens according to claim 1, characterized in that, 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 < 9.2mm.

9. The optical lens according to claim 1, wherein The sagittal height SAG51 of the clear aperture radius of the object side of the fifth lens and the center thickness CT5 of the fifth lens satisfy: 0.3 < SAG51 / CT5 < 0.

38.

10. The optical lens according to claim 1, characterized in that, The distance CT34 on the optical axis between the third lens and the fourth lens, the distance CT45 on the optical axis between the fourth lens and the fifth lens, the distance CT56 on the optical axis between the fifth lens and the sixth lens, the distance CT67 on the optical axis between the sixth lens and the seventh lens and the overall optical length TTL of the optical lens satisfy: 0.01 < (CT34 + CT45 + CT56 + CT67) / TTL < 0.04.

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