Optical lens

Abstract

The application provides an optical lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, a first lens with negative optical power, wherein the object side surface of the first lens is a convex surface and the image side surface of the first lens is a concave surface; a second lens with positive optical power; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface; a fourth lens with positive optical power, wherein the image side surface of the fourth lens is a convex surface; a fifth lens with negative optical power, wherein 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; a sixth lens with positive optical power, wherein 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; and a seventh lens with negative optical power, wherein 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 optical total length TTL of the optical lens satisfies 14.2mm<TTL<15.2mm; and the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 3<TTL / f<5. The optical lens provided by the application can improve the imaging quality of the optical lens and has the advantage of excellent imaging quality by specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

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

[0002] High-quality image transmission is crucial in modern video conferencing systems. Currently, most video conferencing lenses on the market employ fixed-focus or zoom designs to meet the needs of different application scenarios. However, these traditional lenses often suffer from large size and heavy weight, which not only limits the miniaturization of equipment but also increases manufacturing costs. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0004] This invention provides an optical lens comprising seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0005] The first lens with negative optical power has a convex object side and a concave image side.

[0006] A second lens with positive optical power;

[0007] A third lens with positive optical power has a convex object-side surface;

[0008] The fourth lens has positive optical power and its image-side surface is convex.

[0009] The fifth lens with negative optical power has a convex object side and a concave image side.

[0010] The sixth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0011] The seventh lens with negative optical power has a concave object side and a convex image side.

[0012] The total optical length (TTL) of the optical lens satisfies: 14.2 mm. <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 of the optical lens satisfy: 1.2 <TTL / IH<1.5;

[0015] 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 the following condition: 5mm <IH / Fno<5.5mm。

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

[0017] Further 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] Further 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] Further 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] Further 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] Further 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] Further 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] Further 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] Further preferably, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field angle 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, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be enhanced, and the lens has one or more advantages such as miniaturization, short focal length, large aperture, large image plane, high pixel, and high imaging quality. Description of the Drawings

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0043] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0044] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this 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 terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0046] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0047] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 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.

[0048] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this 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 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.

[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 detail this application by referring to the drawings and in conjunction 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 a convex surface, and its image side is a concave surface. The second lens may have a positive optical power, its object side may be a concave surface or a convex surface, and its image side may be a concave surface or a convex surface. The third lens may have a positive optical power, its object side is a convex surface, and its image side may be a concave surface or a convex surface. The fourth lens may have a positive optical power, its object side may be a concave surface or a convex surface, and its image side is a convex surface. The fifth lens may have a negative optical power, its object side is a convex surface, and its image side is a concave surface. The sixth lens may have a positive optical power, its object side is a convex surface, and its image side is a convex surface. The seventh lens may have a negative optical power, its object side is a concave surface, and its image side is a convex surface.

[0053] In some embodiments, the optical lens may further include an aperture stop, and the aperture stop may be located between the third lens and the fourth lens. It can be understood that the aperture stop is used to limit the amount of incident light to change the brightness of the image. When the aperture stop is located between the third lens and the fourth lens, it is convenient for correcting the aperture 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: 14.2 mm < TTL < 15.2 mm. 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, which is beneficial to 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 angle of view 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 angle of view of the optical lens and the aperture value Fno of the optical lens satisfy: 5 mm < IH / Fno < 5.5 mm. Meeting the above conditions can enable the lens to better achieve the balance between large target surface imaging and large aperture performance, can 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 angle of view FOV of the optical lens, and the true image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 30° < (f × FOV) / IH < 55°. Meeting the above conditions, by reasonably restricting the relationship between the focal length, field angle, and image height of the optical lens, it is beneficial to achieve the balance between the large field angle of view and large target surface imaging of the optical lens, and better meets 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 angle of the imaging system is increased, the wide-angle characteristic is achieved, multiple people can be included in the frame, which is suitable for the video conference scenario.

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

[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 beneficial 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 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. 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 end of the optical imaging system sufficient, facilitating the effective convergence of large-angle light rays, being beneficial to achieving 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 angle of the optical lens satisfy: 2.2 < IH / f < 3.7. Meeting the above conditions can achieve a larger field angle and imaging range, and can achieve the characteristics of a large image surface 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 reproducibility.

[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, reaching a higher imaging position, better achieving large-format 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 body while making the structure of the lens more compact.

[0072] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -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 curvature radius R9 of the object side surface of the fifth lens and the curvature radius 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 curvature radius 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 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, the optical lens can satisfy a large image plane while also ensuring sufficient image plane brightness in the peripheral field of view, preventing the occurrence of vignetting, 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. Meeting the above range is conducive to controlling the angle of the incident light beam exiting the optical lens 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, 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 angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention at least has the following features: 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 subject can be kept 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, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens 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 each embodiment 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] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.

[0084] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0085] Example 1

[0086] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture 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 negative optical power, its object side S1 is convex, and its image side S2 is concave.

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

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

[0090] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is convex.

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

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

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

[0094] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0095] The imaging plane S17 is a plane.

[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 Example 1 are shown in Table 1-1.

[0098] Table 1-1

[0099]

[0100]

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

[0102] Table 1-2

[0103] Face 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, axial aberration curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0105] Figure 2 The diagram shows the astigmatism curve of the optical lens 100 in this embodiment, which represents the astigmatism of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the astigmatism in the meridional and sagittal image planes is controlled within ±0.2 mm, indicating that the optical lens 100 can correct astigmatism well.

[0106] Figure 3 The diagram shows the axial aberration curve 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. As can be seen from the figure, the axial aberration offset is controlled within ±0.06 mm, indicating that the optical lens 100 can correct axial aberration well.

[0107] Figure 4 The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents 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 transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens 100 can effectively correct chromatic aberration.

[0108] Example 2

[0109] Please see Figure 5 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that: 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; and the optical parameters such as the radius of curvature and lens thickness of each lens surface 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 profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0115] Table 2-2

[0116] Face 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, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

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

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

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

[0121] Example 3

[0122] Please see Figure 9The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that 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; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0124] Table 3-1

[0125]

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

[0127] Table 3-2

[0128]

[0129]

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

[0131] from Figure 10 As can be seen, the astigmatism of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens 300 can correct astigmatism well.

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

[0133] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0134] Example 4

[0135] Please see Figure 13 The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that: 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; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0137] Table 4-1

[0138]

[0139]

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

[0141] Table 4-2

[0142] Face 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, axial aberration curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 14 , Figure 15 , Figure 16 As shown.

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

[0145] from Figure 15 As can be seen, the axial aberration offset is controlled within ±0.08mm, indicating that the optical lens 400 can correct axial aberration well.

[0146] from Figure 16 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0147] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression 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, the optical lens provided by this invention, through specific surface shape settings and reasonable power distribution, achieves a compact structure, effectively shortening the overall length of the optical lens and facilitating miniaturization. It has a large aperture value, enabling high-definition imaging even in low-light environments. Simultaneously, it has a large imaging surface, allowing for high-definition imaging with larger chips. Furthermore, it features a short focal length, a wide field of view, and a deep depth of field, maintaining relative sharpness both in front of and behind the subject. In addition, it can reasonably correct overall aberrations of the optical lens, resulting in high pixel count and improved imaging quality.

[0151] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0152] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, From the object side to the imaging surface along the optical axis, it successively includes: 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; Wherein, the total optical length TTL of the optical lens satisfies: 14.2mm < TTL < 15.2mm; The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3 < TTL / f < 5; The total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.2 < TTL / IH < 1.5; The true image height IH corresponding to the maximum field angle of the optical lens and the aperture value Fno of the optical lens satisfy: 5mm < IH / Fno < 5.5mm; The radius of curvature R14 of the image side of the seventh lens and the effective focal length f of the optical lens satisfy: -3.8 < R14 / f < -1.

2. The optical lens according to claim 1, characterized in that, 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: 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 radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side 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 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.

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 angle of the optical lens satisfy: 2.2 < IH / f < 3.7.

Images