Optical lens

Abstract

The invention provides an optical lens, which sequentially comprises a first lens with negative focal power from an object side to an imaging surface along an optical axis, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with negative focal power from the object side to the imaging surface, the second lens has positive focal power; the object side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; the total optical length TTL of the optical lens meets the following conditions: 14.2 mmlt; tTLlt; 15.2 mm, 15.2 mm; the total optical length TTL of the optical lens and the effective focal length f of the optical lens meet the following conditions: 3lt; tTL / flt; 5. 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 can be improved, and the optical lens has the advantage of excellent imaging quality.

Description

Technical Field

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

[0002] In modern video conferencing systems, high-quality image transmission is crucial. Most video conferencing lenses on the current market adopt fixed-focus or zoom designs to meet the requirements of different application scenarios. However, these traditional lenses often have problems of relatively large volume and heavy weight, which not only limit the miniaturization design of the device but also increase the manufacturing cost. Summary of the Invention

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

[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:

[0005] A first lens with a negative optical power, whose object side is convex and whose image side is concave;

[0006] A second lens with a positive optical power;

[0007] A third lens with a positive optical power, whose object side is convex;

[0008] A fourth lens with a positive optical power, whose image side is convex;

[0009] A fifth lens with a negative optical power, whose object side is convex and whose image side is concave;

[0010] A sixth lens with a positive optical power, whose object side is convex and whose image side is convex;

[0011] A seventh lens with a negative optical power, whose object side is concave and whose image side is convex;

[0012] Wherein, the total optical length TTL of the optical lens satisfies: 14.2mm < TTL < 15.2mm;

[0013] The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3 < TTL / f < 5;

[0014] 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: 1.2 < TTL / IH < 1.5;

[0015] 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: 5mm < IH / Fno < 5.5mm.

[0016] More preferably, 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: 30° < (f × FOV) / IH < 55°.

[0017] More preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.8 < f1 / f < -1; 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: 3.2 < R1 / R2 < 9.3.

[0018] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1 < f3 / f < 2.5.

[0019] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -3.3 < f5 / f < -1.5.

[0020] More preferably, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -3 < f5 / f6 < -0.5.

[0021] More preferably, the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM72 of the image side surface of the seventh lens satisfy: 1 < DM11 / DM72 < 1.8.

[0022] More preferably, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.5 < f1 / f2 < 0.

[0023] More preferably, the combined focal length f13 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f13 / f < 7.2.

[0024] More preferably, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 2.2 < IH / f < 3.7.

[0025] 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, and improve the imaging quality of the optical lens, making the lens have one or more advantages such as miniaturization, short focal length, large aperture, large image plane, high pixel, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0027] Figure 1 It is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 2 It is an astigmatism curve graph of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 3 It is an axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 4 It is a lateral chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 5 It is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 6 It is an astigmatism curve graph of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 7 It is an axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 8 It is a lateral chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 9 It is a schematic structural diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 10 It is an astigmatism curve graph of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 11 It is an axial aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 12 It is a lateral chromatic aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 13 It is a schematic structural diagram of the optical lens in Embodiment 4 of the present invention.

[0040] Figure 14 It is an astigmatism curve graph of the optical lens in Embodiment 4 of the present invention.

[0041] Figure 15 It is an axial aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0042] Figure 16This is the vertical chromatic aberration curve graph of the optical lens in Embodiment 4 of the present invention.

[0043] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0044] 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.

[0045] 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.

[0046] 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 illustration only and are not drawn to an exact scale.

[0047] 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 being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0048] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0049] 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 commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0050] 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 describe this application in detail with reference to the drawings and in combination with the embodiments.

[0051] The optical lens provided by the embodiment of the present invention has a total of seven lenses, which sequentially include: 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.

[0052] In some embodiments, the first lens may have a negative optical power, its object side is convex, and its image side is concave. The second lens may have a positive optical power, its object side may be concave or convex, and its image side may be concave or convex. The third lens may have a positive optical power, its object side is convex, and its image side may be concave or convex. The fourth lens may have a positive optical power, its object side may be concave or convex, and its image side is convex. The fifth lens may have a negative optical power, its object side is convex, and its image side is concave. The sixth lens may have a positive optical power, its object side is convex, and its image side is convex. The seventh lens may have a negative optical power, its object side is concave, and its image side is convex.

[0053] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the third lens and the fourth 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 third lens and the fourth lens, it is convenient for correcting the diaphragm aberration.

[0054] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0055] In some embodiments, the total optical length TTL of the optical lens satisfies: 14.2mm < TTL < 15.2mm. Meeting the above conditions indicates that the lens has a relatively small total optical length.

[0056] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3 < TTL / f < 5. Meeting the above conditions can effectively limit the length of the lens and is beneficial to realizing the miniaturization of the optical lens.

[0057] 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: 1.2 < TTL / IH < 1.5. 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.

[0058] 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: 5mm < IH / Fno < 5.5mm. Meeting the above conditions can enable the lens to better achieve the balance of large target surface imaging and large aperture performance, make the pixel distribution sparser (i.e., the pixel point size is larger), can reduce noise in a darker environment, and the dynamic range will be wider, and more details can be retained in the dark part, thereby improving the image quality.

[0059] In some embodiments, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens, and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 30° < (f × FOV) / IH < 55°. Meeting the above conditions, 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 usage requirements of high image quality and wide-angle shooting in a video conference room environment.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -1.8 < f1 / f < -1. Meeting the above conditions, the first lens has a negative optical power, which can adjust the light rays incident at a large angle to a smaller angle, thereby reducing the aberration burden of the subsequent lens group; and by reasonably setting the effective focal length of the first lens, the field of view angle of the imaging system is increased, the wide-angle characteristic is realized, multiple people can be included in the frame, which is suitable for the video conference scenario.

[0061] 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: 3.2 < R1 / R2 < 9.3; 1 < (R1 + R2) / (R1 - R2) < 2. Meeting the above conditions, by reasonably setting the curvature radii of the object side surface and the image side surface of the first lens, it is helpful to achieve an ultra-large field of view angle.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1 < f3 / f < 2.5. Meeting the above conditions, by reasonably setting the focal length of the third lens, it is beneficial for the smooth transition of light rays, facilitates the correction of astigmatism and field curvature, improves the imaging quality of the optical lens, and ensures the stability of the optical system.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -3.3 < f5 / f < -1.5. Meeting the above conditions, by setting the fifth lens to have a negative optical power, the beam diameter can be reduced, and the size of the subsequent lens group can be reduced; by adjusting the focal length and surface shape of the fifth lens, the aberration correction and optical path control can be balanced.

[0064] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -3 < f5 / f6 < -0.5. Meeting the above conditions is conducive to the smooth transition of light, while correcting various aberrations of the optical lens and improving the imaging quality of the optical lens.

[0065] In some embodiments, the clear aperture radius DM11 of the object side of the first lens and the clear aperture radius DM72 of the image side of the seventh lens satisfy: 1 < DM11 / DM72 < 1.8. Meeting the above conditions, by reasonably setting the ratio of the focal length and aperture of the first and last lenses, the lens can have a smaller head size while having a larger imaging surface, and can better meet the balance of miniaturization and high pixels.

[0066] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.5 < f1 / f2 < 0. Meeting the above conditions, when the optical power of the first lens is negative, it ensures that the optical power of the second lens is positive, thereby effectively controlling the volume of the optical system. The first lens and the second lens have opposite optical powers, enabling the optical system to have a better ability to balance aberrations.

[0067] In some embodiments, the combined focal length f13 of the first lens, the second lens, and the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f13 / f < 7.2. Meeting the above conditions can effectively control the combined focal length of the first lens to the third lens, making the refractive power intensity at the object side of the optical imaging system sufficient, facilitating the effective convergence of large-angle light, being conducive to realizing the wide-angleization of the optical imaging system, and improving the imaging quality of the optical imaging system.

[0068] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.2 < IH / f < 3.7. Meeting the above conditions can achieve a larger field of view angle and imaging range, and can realize the large image surface characteristic while ensuring the depth of field of the optical lens, thereby improving the imaging quality of the optical system.

[0069] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 0.8 < f6 / f < 2.7. Meeting the above conditions, the sixth lens has a positive optical power, which can further focus the light, optimize the imaging quality, and correct the remaining aberrations (such as distortion, chromatic aberration, etc.), thereby ensuring the imaging clarity and color reproduction.

[0070] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: -4.5 < f7 / f < -1.2. By satisfying the above conditions, by setting the seventh lens to have a large negative optical power, the incident light can be diverged to a large extent, causing the peripheral light and the central light to turn upwards and reach a higher imaging position, better realizing the large target surface imaging of the lens and improving the imaging quality.

[0071] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: 0.2 < BFL / f < 1.2. By satisfying the above conditions, the lens can have an appropriate back focus, ensuring the compatibility between the lens and the camera body while making the structure of the lens more compact.

[0072] 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: -4.2 < R5 / R6 < 0.5; -2 < (R5 + R6) / (R5 - R6) < 0.8. Within the above range, it is beneficial to alleviate the degree of light deflection passing through the lens and can effectively reduce aberration.

[0073] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 1.5 < R9 / R10 < 3; 2 < (R9 + R10) / (R9 - R10) < 3.5. By satisfying the above conditions, the surface shape of the fifth lens can be controlled, the incident angle of light on the fifth lens can be reduced, and at the same time, it is convenient for the processing of the lens.

[0074] In some embodiments, the radius of curvature R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: -3.8 < R14 / f < -1. By satisfying the above conditions, it is beneficial to alleviate the degree of light deflection passing through the lens and can effectively reduce aberration.

[0075] 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: 0.4 < ∑CT / TTL < 0.6. By satisfying the above conditions, the total length of the optical lens can be effectively compressed, and at the same time, it is beneficial to the structural design and production process of the optical 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: 4.8 < IH / EPD < 7.8. By satisfying the above range, while the optical lens satisfies a large image surface, it can also ensure sufficient image surface brightness in the edge field of view, preventing the occurrence of vignetting phenomenon, thereby improving the imaging quality.

[0077] In some embodiments, the combined focal length f47 of the fourth lens, the fifth lens, the sixth lens, and the seventh lens and the effective focal length f of the optical lens satisfy: 1.5 < f47 / f < 8. By satisfying the above range, by reasonably controlling the ratio of the combined focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens to the effective focal length of the optical lens, it is beneficial to control the angle of the incident light beam exiting the optical lens, so as to reduce the aberration generated by the optical lens.

[0078] In some embodiments, the optical lens satisfies the conditional formula: 2.5 mm < f < 4.5 mm; 1.9 < Fno < 2.1, 10.2 mm < IH < 11 mm, where f represents the effective focal length of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. By satisfying the above conditions, it shows that the optical lens provided by the embodiments of the present invention at least has the following characteristics: having the characteristics of short focal length and wide angle, the depth of field of a short focal length lens is relatively deep, and both the front and back of the main body can remain relatively clear; having a relatively large imaging surface, which can be matched with a relatively large-sized chip to achieve high-definition imaging; having a relatively large aperture value, and high-definition imaging can be achieved even in a low-light environment such as a conference room.

[0079] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. On the other hand, when the lens material is glass, due to the low dispersion characteristic of the glass itself, the geometric chromatic aberration of the optical system can be effectively corrected. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also enables the structure of the lens to be relatively compact, and can better achieve the balance of miniaturization and high image quality of the lens.

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

[0081] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0082]

[0083] 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, F, G, H are the conic coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders respectively.

[0084] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only the preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any 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.

[0085] Embodiment 1

[0086] 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 S17: a first lens L1, a second lens L2, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0087] 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;

[0088] The second lens L2 has a positive optical power, its object side surface S3 is a concave surface, and its image side surface S4 is a convex surface;

[0089] The third lens L3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface;

[0090] 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;

[0091] The fifth lens L5 has a negative optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface;

[0092] The sixth lens L6 has a positive optical power, its object side surface S11 is a convex surface, and its image side surface S12 is a convex surface;

[0093] The seventh lens L7 has a negative optical power, its object side surface S13 is a concave surface, and its image side surface S14 is a convex surface;

[0094] Both the object side surface S15 and the image side surface S16 of the filter G1 are flat surfaces;

[0095] The imaging surface S17 is a flat surface.

[0096] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all made of plastic aspherical lenses.

[0097] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0098] Table 1-1

[0099]

[0100]

[0101] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0102] Table 1-2

[0103] Plane number K B C D E F G H S1 -5.19E+00 -2.32E-05 -7.39E-08 1.29E-08 8.14E-10 3.18E-11 1.02E-12 2.96E-14 S2 -5.12E-01 -6.16E-04 -7.80E-05 -1.80E-06 -3.11E-07 -5.04E-08 -5.87E-09 -5.79E-10 S3 1.19E+01 -1.30E-04 -6.21E-06 -6.74E-07 -1.07E-07 -1.14E-08 2.25E-10 4.09E-10 S4 -6.71E+00 2.83E-05 -5.62E-06 -1.06E-06 -6.55E-08 1.49E-08 5.96E-09 1.05E-09 S5 -5.26E-01 -3.80E-04 -3.33E-05 1.54E-05 6.75E-06 1.70E-06 1.79E-07 -6.52E-08 S6 4.14E+01 -3.18E-04 2.20E-04 6.04E-05 7.88E-06 8.32E-07 3.37E-07 5.08E-08 S7 3.81E+01 1.04E-03 -5.46E-04 -9.57E-06 1.66E-06 -4.11E-06 -3.32E-06 -2.13E-06 S8 -3.01E+00 3.74E-05 -6.45E-04 -2.63E-04 -3.74E-05 2.25E-06 7.95E-07 -1.78E-06 S9 -5.35E+01 -1.74E-03 -8.45E-04 -1.05E-04 -8.56E-06 -6.91E-06 -3.95E-06 -4.12E-07 S10 -1.28E+01 -3.25E-04 -2.26E-04 -2.38E-05 9.98E-06 -2.82E-06 -2.36E-06 1.18E-07 S11 -8.99E+01 -7.11E-05 9.04E-05 5.56E-05 1.25E-05 -2.34E-06 -1.41E-06 4.09E-07 S12 -7.24E-01 8.55E-04 -2.94E-04 -2.92E-05 -3.29E-06 -2.64E-07 8.96E-08 7.21E-08 S13 -2.43E-01 -9.82E-04 7.07E-05 -7.04E-05 -6.33E-06 -1.45E-07 5.21E-08 7.31E-09 S14 1.51E+00 7.74E-05 -2.51E-05 1.96E-07 6.64E-08 4.92E-09 2.69E-10 4.48E-12

[0104] In this embodiment, the astigmatism curve graph, the axial aberration curve graph, and the lateral chromatic aberration curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 shown.

[0105] Figure 2 shows the astigmatism curve graph of the optical lens 100 in this embodiment, which represents 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 semi-field angle (unit: °). It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.2 mm, indicating that the optical lens 100 can correct astigmatism well.

[0106] Figure 3 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 ±0.06 mm, indicating that the optical lens 100 can correct axial aberration well.

[0107] Figure 4 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 ±2 μm, indicating that the optical lens 100 can correct chromatic aberration well.

[0108] Example 2

[0109] Please refer to Figure 5 , 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 S3 of the second lens L2 is a convex surface; the image side surface S4 of the second lens L2 is a concave surface; the image side surface S6 of the third lens L3 is a convex surface; the object side surface S7 of the fourth lens L4 is a concave surface; the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0110] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0111] Table 2-1

[0112]

[0113]

[0114] The surface type parameters of the aspherical lenses in the optical lens 200 in Example 2 are shown in Table 2-2.

[0115] Table 2-2

[0116] Plane number K B C D E F G H S1 -4.02E+00 -1.97E-05 -5.03E-07 -1.28E-08 -1.77E-10 -1.02E-13 -2.12E-13 -4.15E-14 S2 -8.30E-01 -7.64E-04 2.21E-05 -5.39E-06 -5.71E-07 -3.10E-08 -6.59E-10 4.01E-10 S3 -2.09E+00 1.47E-04 7.88E-06 6.17E-07 9.02E-08 1.76E-08 2.85E-09 -2.67E-10 S4 1.84E+01 3.38E-05 5.19E-05 1.12E-05 3.28E-07 -1.54E-06 -6.54E-07 9.57E-08 S5 1.65E+00 7.08E-04 -1.01E-04 -2.56E-04 -8.97E-05 -6.23E-07 2.37E-06 -7.69E-06 S6 1.13E+01 3.91E-04 -1.13E-03 -5.68E-04 -2.87E-04 -1.10E-04 -5.62E-06 4.65E-05 S7 4.67E+00 -1.09E-03 -1.49E-04 -5.02E-04 -4.72E-04 -1.72E-04 4.75E-05 1.07E-04 S8 -4.76E+00 3.13E-04 -4.57E-04 -3.40E-04 -1.81E-04 1.46E-05 5.47E-05 6.60E-07 S9 -1.00E+02 2.44E-05 5.52E-05 3.07E-05 2.00E-06 -2.05E-05 -1.33E-05 5.75E-06 S10 -2.05E+01 8.15E-07 2.27E-05 1.21E-05 3.97E-06 3.28E-06 1.54E-06 6.01E-07 S11 -1.00E+02 -4.27E-04 -6.61E-06 5.93E-06 2.71E-06 2.31E-06 1.75E-06 1.19E-06 S12 -1.17E+00 1.39E-03 1.44E-04 3.24E-05 5.41E-06 6.47E-07 3.56E-08 -9.09E-09 S13 7.86E-01 1.61E-03 6.15E-05 -1.88E-05 -4.08E-07 4.97E-07 1.82E-07 4.34E-08 S14 -1.28E+00 -1.10E-04 -2.48E-05 -3.50E-06 -3.10E-07 -1.59E-08 -3.30E-11 1.50E-10

[0117] In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 200 are respectively as shown in Figure 6 , Figure 7 , Figure 8 .

[0118] It can be seen from Figure 6 that the astigmatism between the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 200 can correct astigmatism well.

[0119] It can be seen from Figure 7 that the offset of the axial aberration is controlled within ±0.04 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0120] It can be seen from Figure 8 that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0121] Example 3

[0122] Please refer to Figure 9, which shows the structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main differences are as follows: the image side S6 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0123] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0124] Table 3-1

[0125]

[0126] The surface type parameters of the aspherical lenses of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0127] Table 3-2

[0128]

[0129]

[0130] In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 300 are respectively as Figure 10 , Figure 11 , Figure 12 shown.

[0131] From Figure 10 it can be seen that the astigmatism between the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 300 can correct astigmatism well.

[0132] From Figure 11 it can be seen that the offset of the axial aberration is controlled within ±0.06 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0133] From Figure 12 it can be seen that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0134] Embodiment 4

[0135] Please refer to Figure 13 , which shows the structural schematic 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 S3 of the second lens L2 is a convex surface; the image side S4 of the second lens L2 is a concave surface; the image side S6 of the third lens L3 is a convex surface; the object side S7 of the fourth lens L4 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0136] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0137] Table 4-1

[0138]

[0139]

[0140] The surface type parameters of the aspherical lenses of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0141] Table 4-2

[0142] Plane number K B C D E F G H S1 8.99E-01 -4.17E-06 2.03E-07 8.60E-09 2.49E-10 6.72E-12 1.68E-13 3.51E-15 S2 -7.39E-01 -2.68E-04 4.08E-05 8.34E-07 -1.44E-07 -1.27E-08 3.81E-10 2.83E-10 S3 -7.28E-01 -2.83E-05 -4.63E-06 -1.02E-06 -1.73E-07 -2.81E-08 -4.41E-09 -6.64E-10 S4 1.22E+00 -1.21E-04 -5.73E-07 1.34E-05 1.87E-06 -8.46E-07 -4.14E-07 -8.40E-08 S5 -2.85E+01 -2.18E-04 -9.29E-05 -1.61E-05 -2.03E-06 6.04E-08 2.04E-07 1.20E-07 S6 -3.10E+00 -2.89E-04 -1.37E-04 -2.66E-05 -2.57E-06 5.80E-07 3.96E-07 1.34E-07 S7 -1.08E+00 1.09E-07 -6.98E-05 -2.19E-05 -1.29E-06 1.59E-06 9.19E-07 3.09E-07 S8 -4.64E-01 1.73E-05 1.42E-05 5.62E-06 2.27E-06 4.58E-07 9.88E-08 7.86E-08 S9 -6.67E+01 1.24E-05 4.29E-07 -4.73E-06 -2.62E-06 -4.09E-07 7.37E-08 6.70E-08 S10 -7.32E+00 -5.96E-05 -1.49E-05 -3.01E-06 -2.29E-07 8.35E-08 3.04E-08 5.39E-09 S11 -2.22E+00 -6.74E-05 4.84E-07 6.08E-08 4.21E-09 2.98E-10 1.62E-11 -2.32E-13 S12 -1.00E+02 4.14E-05 -2.47E-06 -1.24E-07 -4.55E-09 -2.21E-10 -1.68E-11 -1.50E-12 S13 -3.89E-01 -4.82E-05 8.57E-06 7.57E-07 2.10E-08 -1.46E-11 -4.89E-11 -4.69E-12 S14 6.77E+00 -1.30E-05 -3.44E-06 -1.78E-07 1.22E-09 3.92E-10 2.21E-11 9.62E-13

[0143] In this embodiment, the astigmatism curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 400 are respectively as shown in Figure 14 , Figure 15 , Figure 16 .

[0144] It can be seen from Figure 14 that the astigmatism between the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct astigmatism well.

[0145] It can be seen from Figure 15 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.

[0146] It can be seen from Figure 16 that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0147] 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.

[0148] Table 5

[0149] Parameters and conditional expressions Example 1 Example 2 Example 3 Example 4 f (mm) 4.017 2.973 4.372 3.856 FOV (°) 124.000 124.000 124.000 130.000 TTL (mm) 14.999 14.500 14.501 14.514 Fno 2.100 2.100 2.100 2.000 IH (mm) 10.591 10.601 10.599 10.802 CRA (°) 37.006 33.840 35.186 36.328 EPD (mm) 1.913 1.416 2.082 1.928 TTL / f 3.734 4.878 3.317 3.764 (f × FOV) / IH (°) 47.029 34.770 51.145 46.407 IH / f 2.637 3.566 2.424 2.801 TTL / IH 1.416 1.368 1.368 1.344 f1 / f -1.553 -1.183 -1.285 -1.302 f3 / f 2.218 1.474 1.415 1.170 f5 / f -2.665 -3.019 -1.905 -2.146 f6 / f 1.080 1.165 0.937 2.523 f7 / f -1.555 -4.351 -2.149 -2.816 BFL / f 0.639 1.087 0.802 0.392 R1 / R2 3.512 9.021 3.697 4.372 R5 / R6 0.268 -0.553 -0.685 -3.960 R9 / R10 1.877 2.472 2.782 2.502 R14 / f -1.612 -1.985 -1.146 -3.418 (R1 + R2) / (R1 - R2) 1.796 1.249 1.742 1.593 (R5 + R6) / (R5 - R6) -1.731 -0.288 -0.187 0.597 (R9 + R10) / (R9 - R10) 3.279 2.359 2.123 2.332 f1 / f2 -0.059 -0.312 -0.036 -0.182 f5 / f6 -2.467 -2.592 -2.033 -0.851 ∑CT / TTL 0.499 0.533 0.423 0.585 IH / Fno (mm) 5.043 5.048 5.047 5.401 DM11 / DM72 1.613 1.620 1.598 1.232 IH / EPD 5.537 7.489 5.091 5.603 f13 / f 6.907 1.461 2.658 1.422 f47 / f 1.735 2.867 2.186 7.692

[0150] In summary of the above embodiments, the optical lens provided by the present invention has a relatively compact structure through specific surface shape settings and reasonable optical power distribution, effectively shortening the overall length of the optical lens, which is conducive to miniaturization. It has a large aperture value, enabling high-definition imaging even in a relatively dark environment. At the same time, it has a large imaging surface and can match a larger-sized chip to achieve high-definition imaging. It also has the characteristics of short focal length, large field of view angle, and relatively deep depth of field, with relatively clear images both in front of and behind the main body. In addition, it can reasonably correct the overall aberration of the optical lens, enabling the optical lens to have high pixels and improving the imaging quality of the optical lens.

[0151] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0152] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several 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 should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It successively 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 positive optical power; A third lens with a positive optical power, whose object side is convex; A fourth lens with a positive optical power, whose image side is convex; A fifth lens with a negative optical power, whose object side is convex and whose image side is concave; A sixth lens with a positive optical power, whose object side is convex and whose image side is convex; A seventh lens with a negative optical power, whose object side is concave and whose image side is convex; Among them, the overall optical length TTL of the optical lens satisfies: 14.2mm < TTL < 15.2mm; The overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3 < TTL / f < 5; The overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 1.2 < TTL / IH < 1.5; 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: 5mm < IH / Fno < 5.5mm.

2. The optical lens according to claim 1, characterized in that: 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: 30° < (f × FOV) / IH < 55°.

3. 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: -1.8 < f1 / f < -1; The object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: 3.2 < R1 / R2 < 9.

3.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1 < f3 / f < 2.

5.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -3.3 < f5 / f < -1.

5.

6. The optical lens according to claim 1, characterized in that: The focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -3 < f5 / f6 < -0.

5.

7. The optical lens according to claim 1, characterized in that: The clear aperture semi-diameter DM11 of the object side of the first lens and the clear aperture semi-diameter DM72 of the image side of the seventh lens satisfy: 1 < DM11 / DM72 < 1.

8.

8. The optical lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.5 < f1 / f2 < 0.

9. The optical lens according to claim 1, characterized in that: The combined focal length f13 of the first lens, the second lens and the third lens and the effective focal length f of the optical lens satisfy: 1.2 < f13 / f < 7.

2.

10. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.2 < IH / f < 3.7.

Images