Optical lens

Abstract

The present invention provides an optical lens having seven lenses, which include, in order from the object side to the imaging surface along the optical axis: a first lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens having negative optical power, whose image side surface is concave; a third lens having positive optical power, whose object side surface is convex and whose image side surface is concave; a fourth lens having positive optical power, whose object side surface is concave and whose image side surface is convex; a fifth lens having positive optical power, whose object side surface is convex and whose image side surface is convex; a sixth lens having negative optical power, whose object side surface is concave and whose image side surface is concave; and a seventh lens having positive optical power, whose image side surface is convex. The optical lens provided by the present invention reduces aberrations and improves the imaging quality of the optical lens through specific surface shape matching and reasonable optical power distribution, so that the lens has one or more advantages such as ultra-wide angle, short total length, large aperture, and high imaging quality.

Description

Technical Field

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

[0002] In the field of modern sports image capture, high-performance portable optical systems are a core requirement. However, these traditional optical structures generally suffer from reduced image quality in low-light environments and insufficient dynamic range. Furthermore, to improve image stabilization, they often employ complex optical compensation mechanisms, which increase the size and weight of lens modules. This not only restricts the device's suitability for extreme sports scenarios but also significantly increases production and maintenance costs. 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, short total length, large aperture, and high imaging quality.

[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:

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

[0006] a second lens element having negative optical power and a concave image-side surface;

[0007] a third lens element having positive optical power, whose object-side surface is convex and whose image-side surface is concave;

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

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

[0010] a sixth lens element having negative optical power, whose object-side surface and image-side surface are concave;

[0011] a seventh lens element having positive refractive power and a convex image-side surface;

[0012] The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 50 <f3 / f<130;

[0013] The center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis meet the following conditions: 0.18 <CT2 / CT3<0.36。

[0014] Further preferably, the object side curvature radius R5 of the third lens and the image side curvature radius R6 of the third lens satisfy: 0.75 <R5 / R6<0.95。

[0015] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 3.6 < f4 / f < 4.3; 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: 1.9 < (R7 + R8) / (R7 - R8) < 2.1.

[0016] More preferably, the sagittal height SAG11 of the object side surface clear aperture of the first lens and the clear aperture DM11 of the object side surface of the first lens satisfy: 0.16 < SAG11 / DM11 < 0.2.

[0017] More preferably, the sagittal height SAG41 of the object side surface clear aperture of the fourth lens and the clear aperture DM41 of the object side surface of the fourth lens satisfy: -0.07 < SAG41 / DM41 < -0.05; the sagittal height SAG42 of the image side surface clear aperture of the fourth lens and the clear aperture DM42 of the image side surface of the fourth lens satisfy: -0.2 < SAG42 / DM42 < -0.15.

[0018] More preferably, the maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 105° < FOV / Fno < 130°.

[0019] More preferably, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < BFL / f < 1.8.

[0020] More preferably, the edge thickness ET3 of the third lens and the central thickness CT3 of the third lens on the optical axis satisfy: 0.9 < ET3 / CT3 < 1.1.

[0021] More preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.6 < f1 / f2 < 0.7.

[0022] More preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 11.

[0023] Compared with the prior art, the optical lens provided by the present invention adopts seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberration, and enhance the imaging quality of the optical lens, enabling the lens to have one or more advantages such as ultra-wide angle, short total length, large aperture, and high imaging quality. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0025] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0026] Figure 2 Graph showing the astigmatism of the optical lens in Example 1 of the present invention.

[0027] Figure 3 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 4 Graph showing vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 5 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 6 Graph showing the astigmatism of the optical lens in Example 2 of the present invention.

[0031] Figure 7 Graph showing the axial aberration of the optical lens in Example 2 of the present invention.

[0032] Figure 8 Graph showing vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0033] Figure 9 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0034] Figure 10 4 is an astigmatism curve diagram of the optical lens in Example 3 of the present invention.

[0035] Figure 11 Graph showing the axial aberration of the optical lens in Example 3 of the present invention.

[0036] Figure 12 Graph showing vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0037] Figure 13 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0038] Figure 14 4 is an astigmatism curve diagram of the optical lens in Example 4 of the present invention.

[0039] Figure 15 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0040] Figure 16Graph showing vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0041] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0042] For a better understanding of 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 merely descriptions of embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0043] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of the present invention.

[0044] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0046] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein shall 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.

[0048] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will detail this application by referring to the drawings and in conjunction with the embodiments.

[0049] 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.

[0050] The first lens may have a negative optical power. Its object side surface is convex, and its image side surface is concave. The second lens may have a negative optical power. Its object side surface may be concave or convex, and its image side surface is concave. The third lens may have a positive 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 concave, and its image side surface is convex. The fifth lens may have a positive optical power. Its object side surface is convex, and its image side surface is convex. The sixth lens may have a negative optical power. Its object side surface is concave, and its image side surface is concave. The seventh lens may have a positive optical power. Its object side surface may be concave or convex, and its image side surface is convex.

[0051] In some embodiments, the optical lens may further include an aperture. The aperture may be located between the fourth lens and the fifth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. When the aperture is located between the fourth lens and the fifth lens, it is convenient for the correction of aperture aberration.

[0052] In some embodiments, the optical lens may further include a filter. The filter is disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0053] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 50 < f3 / f < 130. Meeting the above conditions, by reasonably setting the focal length of the third lens, it is beneficial to the smooth transition of light rays, convenient for the correction of astigmatism and field curvature, and improves the imaging quality of the optical lens.

[0054] In some embodiments, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.18 < CT2 / CT3 < 0.36. Meeting the above conditions can reduce the assembly deformation and assembly difficulty of the lens while meeting the requirements of assembly stability, and at the same time make the structure of the lens more compact, which is conducive to the miniaturization of the lens.

[0055] In some embodiments, the object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy: 0.75 < R5 / R6 < 0.95. Meeting the above conditions is beneficial to controlling the shape of the third lens, correcting the aberration generated by itself, and improving the imaging quality.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 3.6 < f4 / f < 4.3; the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: 1.9 < (R7 + R8) / (R7 - R8) < 2.1. Meeting the above conditions, the fourth lens has an appropriate positive optical power and surface shape, avoiding the influence of too extreme shapes on optical performance, which is beneficial to slowing down the light turning trend and reducing the light height, making the light trend transition smoothly, and at the same time is beneficial to reducing the correction difficulty of spherical aberration and field curvature, and improving the imaging quality of the optical lens.

[0057] In some embodiments, the central thickness CT3 of the third lens on the optical axis and the sagittal height SAG32 of the image-side clear aperture semi-diameter of the third lens satisfy: 21 < CT3 / SAG32 < 35. Meeting the above conditions, by controlling the third lens to be extremely thick and the edge curvature to be extremely gentle, the spherical aberration of the large aperture can be reduced, and the marginal astigmatism can be significantly reduced.

[0058] In some embodiments, the sagittal height SAG11 of the object-side clear aperture semi-diameter of the first lens and the object-side clear aperture semi-diameter DM11 of the first lens satisfy: 0.16 < SAG11 / DM11 < 0.2. Meeting the above conditions can avoid the over-bending of the object-side surface shape of the first lens, reduce the processing difficulty of the first lens; at the same time, it is also beneficial to the transmission of marginal light to the rear end of the optical lens, and improve the imaging quality of the optical lens.

[0059] In some embodiments, the sagittal height SAG41 of the object-side clear aperture semi-diameter of the fourth lens and the object-side clear aperture semi-diameter DM41 of the fourth lens satisfy: -0.07 < SAG41 / DM41 < -0.05; the sagittal height SAG42 of the image-side clear aperture semi-diameter of the fourth lens and the image-side clear aperture semi-diameter DM42 of the fourth lens satisfy: -0.2 < SAG42 / DM42 < -0.15. Meeting the above conditions can limit the central depression degree of the fourth lens and reduce the aberration correction difficulty of the marginal field of view.

[0060] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 105° < FOV / Fno < 130°. Meeting the above conditions defines that the optical lens has a suitable field of view and aperture value, can collect light at a large angle, and obtain good imaging quality.

[0061] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < BFL / f < 1.8. 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, ensuring the imaging quality of the optical lens while avoiding interference between the lens and other components and reducing the assembly process difficulty of the camera module.

[0062] In some embodiments, the edge thickness ET3 of the third lens and the central thickness CT3 of the third lens on the optical axis satisfy: 0.9 < ET3 / CT3 < 1.1. Meeting the above conditions can effectively balance the high-order aberrations generated by the optical lens by controlling the ratio of the thickness on the optical axis to the edge thickness of the third lens, and is also beneficial to the field curvature adjustment of the lens, thereby improving the imaging quality of the optical lens.

[0063] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.6 < f1 / f2 < 0.7. Meeting the above conditions, by reasonably setting the ratio of the focal lengths of the first lens and the second lens, while achieving a large field of view, the deflection degree of incident light in the large field of view range can be reasonably balanced, reducing the sensitivity of the optical system and the difficulty of system distortion correction, and improving the overall imaging quality.

[0064] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 11. Meeting the above conditions can reasonably control the overall length of the optical lens and the focal length of the optical lens, so that the optical lens has a reasonable focal length without causing the overall length of the optical lens to be too long, which is beneficial to the miniaturization of the optical lens.

[0065] 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: 60° < (f × FOV) / IH < 67°. Meeting the above range can ensure that the optical lens has a large field of view characteristic by reasonably restricting the relationship between the focal length, field of view, and image height of the optical lens, so that the optical lens has good optical performance and can capture the details of the photographed object well.

[0066] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.5 < f1 / f < -2.7. Meeting the above conditions, the first lens has an appropriate negative focal length, which is beneficial to expanding the field angle of the optical lens.

[0067] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -5 < f2 / f < -4. Meeting the above conditions, the second lens has an appropriate negative focal length, which can share the negative optical power at the front end of the optical lens, thus facilitating to avoid excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of chromatic aberration correction of the optical lens.

[0068] 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 < 2. Meeting the above conditions, the fifth lens has an appropriate positive focal length, which is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0069] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.8 < f6 / f < -1.6. Meeting the above conditions, the sixth lens has an appropriate negative focal length, which is beneficial to increasing the imaging area of the optical lens, while balancing various aberrations generated by the fifth lens and improving the imaging quality of the optical lens.

[0070] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 2.3 < f7 / f < 3. Meeting the above conditions, the seventh lens has a short focal length, which helps to collect light, ensure the light transmission amount, improve the relative illumination, and enhance the brightness of the optical lens at the image plane.

[0071] In some embodiments, the focal length f1 of the first lens and the focal length f7 of the seventh lens satisfy: -1.2 < f1 / f7 < -1. Meeting 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 light entering the imaging plane is increased, which is beneficial to achieving large image plane imaging of the lens, while increasing the light input amount and improving the relative illumination of the system.

[0072] In some embodiments, the edge thickness CT4 of the fourth lens and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.8 < ET4 / CT4 < 0.9. Meeting the above conditions, the surface shape of the fourth lens can be reasonably controlled, making its surface shape have a small curvature. By slightly restricting the ratio of the edge thickness to the central thickness of the lens, the lens structure is easy to process, and the production cost is saved to a certain extent.

[0073] In some embodiments, the distance ET34 between the edge of the third lens and the edge of the fourth lens, the distance CT34 between the third lens and the fourth lens on the optical axis, and the total optical length TTL of the optical lens satisfy: 0.01 < (ET34 + CT34) / TTL < 0.03; the distance ET56 between the edge of the fifth lens and the edge of the sixth lens, the distance ET67 between the edge of the sixth lens and the edge of the seventh lens, and the total optical length TTL of the optical lens satisfy: 0.02 < (ET56 + ET67) / TTL < 0.04. Meeting the above ranges can reduce the edge distance between the lenses, making the structure of the optical lens compact.

[0074] In some embodiments, the combined focal length f57 of the fifth lens, the sixth lens and the seventh lens and the effective focal length f of the optical lens satisfy: 2.6 < f57 / f < 3.2. By satisfying the above relational expression, on the one hand, it is beneficial to control the height of the outgoing light beam of the optical system to reduce the high-order aberration of the optical system and the outer diameter of the lens; on the other hand, it can correct the influence of the field curvature generated by the front lens group on the resolution.

[0075] In some embodiments, the optical lens satisfies the conditional expression: 9mm < TTL < 12mm, 1mm < f < 1.1mm, 190° < FOV < 200°, 3.2mm < IH < 3.4mm, 1.5 < Fno < 1.9, where TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, FOV represents the maximum field angle of view of the optical lens, IH represents the true image height corresponding to the maximum field angle of view 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 miniaturization, large field angle, and large aperture.

[0076] In some embodiments, the seven lenses in the optical lens can all use 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 use 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 volume, and provide an optical lens product with higher cost performance.

[0077] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses may be spherical or aspherical lenses. Compared to spherical lenses, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number and size of lenses and achieving better miniaturization. More specifically, in the optical lens provided by the present invention, the first and fourth lenses may be spherical lenses, while the second, third, fifth, sixth, and seventh lenses may be aspherical lenses.

[0078] In various embodiments of the present invention, when the lens is an aspheric lens, the shapes of the aspheric surfaces of the optical lens satisfy the following equations:

[0079] ;

[0080] Where z is the distance between the surface and the vertex in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients, respectively.

[0081] The present invention is further illustrated below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens vary; for details, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any other changes, substitutions, combinations, or simplifications that do not deviate from the novelties of the present invention shall be considered equivalent replacements and are included within the scope of protection of the present invention.

[0082] Example 1

[0083] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0084] The first lens L1 has negative refractive power, its object-side surface S1 is convex, and its image-side surface S2 is concave;

[0085] The second lens L2 has negative refractive power, its object-side surface S3 is concave, and its image-side surface S4 is concave;

[0086] The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0087] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0088] The fifth lens L5 has positive refractive power, its object-side surface S9 is convex, and its image-side surface S10 is convex;

[0089] The sixth lens L6 has negative refractive power, its object-side surface S11 is concave, and its image-side surface S12 is concave;

[0090] The seventh lens L7 has positive refractive power, its object-side surface S13 is convex, and its image-side surface S14 is convex;

[0091] The object-side surface S15 and the image-side surface S16 of the filter G1 are both flat surfaces;

[0092] The imaging surface S17 is a plane.

[0093] The first lens L1 and the fourth lens L4 are glass spherical lenses; the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0094] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0098] Table 1-2

[0099]

[0100] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 、 Figure 3 、 Figure 4 shown.

[0101] Figure 2 The astigmatism curve of Example 1 is shown, which shows the astigmatism 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 half field angle (unit: °). As can be seen from the figure, the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0102] Figure 3The axial aberration curve of Example 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, with the horizontal axis representing the axial aberration value (unit: mm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.01mm, indicating that the optical lens 100 is capable of correcting axial aberration well.

[0103] Figure 4 A vertical chromatic aberration curve for Example 1 is shown. It plots the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the field of view angle. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within a range of -1 μm to 3 μm, demonstrating that the optical lens 100 is capable of excellently correcting chromatic aberration across all viewing angles.

[0104] Example 2

[0105] See also Figure 5 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S3 of the second lens L2 is convex at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0106] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0107] Table 2-1

[0108]

[0109] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0110] Table 2-2

[0111]

[0112] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 、 Figure 7 、 Figure 8 shown.

[0113] from Figure 6 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, indicating that the optical lens 200 can correct the astigmatism well.

[0114] from Figure 7It can be seen from the figure that the offset of the axial aberration is controlled within ±0.01 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0115] from Figure 8 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~3μm, indicating that the optical lens 200 can perfectly correct the chromatic aberration of each field of view.

[0116] Example 3

[0117] See also Figure 9 , shown is a schematic structural diagram of an optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S13 of the seventh lens L7 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0118] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0119] Table 3-1

[0120]

[0121] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0122] Table 3-2

[0123]

[0124] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 、 Figure 11 、 Figure 12 shown.

[0125] from Figure 10 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within a range of -0.1 mm to 0, indicating that the optical lens 300 can correct the astigmatism well.

[0126] from Figure 11 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0127] from Figure 12 It can be seen that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~3μm, indicating that the optical lens 300 can perfectly correct the chromatic aberration of each field of view.

[0128] Example 4

[0129] See also Figure 13 , shown is a schematic structural diagram of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, this embodiment mainly differs in that: the object-side surface S3 of the second lens L2 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0130] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0131] Table 4-1

[0132]

[0133] The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0134] Table 4-2

[0135]

[0136] In this embodiment, the astigmatism curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 14 、 Figure 15 、 Figure 16 shown.

[0137] from Figure 14 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.05 mm, indicating that the optical lens 400 can correct the astigmatism well.

[0138] from Figure 15 It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0139] from Figure 16 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm~3μm, indicating that the optical lens 400 can perfectly correct the chromatic aberration of each field of view.

[0140] Please refer to Table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, real image height IH corresponding to the maximum field of view angle, incident angle CRA of the chief ray on the imaging surface at the maximum image height, maximum field of view FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0141] Table 5

[0142]

[0143] In summary, the optical lens provided by the present invention utilizes a seven-piece glass-plastic hybrid structure. Through specific surface configurations and a rational distribution of optical power, the optical lens is compact, effectively shortening its overall length and facilitating the miniaturization and portability of the device. It also features a large aperture, enabling high-definition imaging even in relatively dark environments, and a wide field of view, enabling the capture of a wider range of images. Furthermore, it can rationally correct for overall aberrations in the optical lens, improving its imaging quality.

[0144] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0145] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An optical lens, comprising seven lenses, 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 object side is convex and whose image side is concave; A second lens with a negative optical power, whose image side is concave; A third lens with a positive 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 concave and whose image side is convex; A fifth lens with a positive optical power, whose object side is convex and whose image side is convex; A sixth lens with a negative optical power, whose object side is concave and whose image side is concave; A seventh lens with a positive optical power, whose image side is convex; The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 50 < f3 / f < 130; The central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 0.18 < CT2 / CT3 < 0.36; The sagittal height SAG11 of the clear aperture semi-diameter of the object side of the first lens and the clear aperture semi-diameter DM11 of the object side of the first lens satisfy: 0.16 < SAG11 / DM11 < 0.

2.

2. The optical lens according to claim 1, wherein: The curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: 0.75 < R5 / R6 < 0.

95.

3. 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: 3.6 < f4 / f < 4.3; The curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.9 < (R7 + R8) / (R7 - R8) < 2.

1.

4. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens, the maximum field angle FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 60° < (f × FOV) / IH < 67°.

5. The optical lens according to claim 1, wherein: The sagittal height SAG41 of the clear aperture semi-diameter of the object side of the fourth lens and the clear aperture semi-diameter DM41 of the object side of the fourth lens satisfy: -0.07 < SAG41 / DM41 < -0.05; The sagittal height SAG42 of the clear aperture semi-diameter of the image side of the fourth lens and the clear aperture semi-diameter DM42 of the image side of the fourth lens satisfy: -0.2 < SAG42 / DM42 < -0.

15.

6. The optical lens according to claim 1, wherein: The maximum field angle FOV of the optical lens and the f-number Fno of the optical lens satisfy: 105° < FOV / Fno < 130°; 7. The optical lens according to claim 1, wherein: The back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < BFL / f < 1.8; 8. The optical lens according to claim 1, wherein: The edge thickness ET3 of the third lens and the central thickness CT3 of the third lens on the optical axis satisfy: 0.9 < ET3 / CT3 < 1.1; 9. The optical lens according to claim 1, wherein: The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.6 < f1 / f2 < 0.7; 10. The optical lens according to claim 1, wherein: The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 8.5 < TTL / f < 11.

Images