Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: 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, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens with negative optical power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens with positive optical power, wherein the object side surface of the fourth lens is a convex surface, and 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 negative optical power, wherein the object side surface of the sixth lens is a convex surface near the optical axis, and the image side surface of the sixth lens is a concave surface near the optical axis; and a seventh lens with positive optical power, wherein the object side surface of the seventh lens is a convex surface near the optical axis, and the image side surface of the seventh lens is a concave surface near the optical axis. The optical lens provided by the application has one or more advantages such as large wide angle, small distortion, large target surface, high pixel and the like.

Description

Technical Field

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

[0002] With increasing cross-regional collaborative work, video conferencing systems have become an indispensable part of modern productivity. In video conferencing, the video camera is a key component, and its performance directly affects the quality of the meeting. However, most video conferencing cameras on the market currently have significant shortcomings: either the field of view is not wide enough, preventing the imaging surface from fully covering the meeting room and making it difficult for some participants to be seen; or the distortion is too great, severely affecting the visual effect; or the lens resolution is not high enough, resulting in blurry images of people. These problems mean that existing video conferencing cameras are insufficient to fully meet the needs of video conferencing, greatly limiting the video conferencing experience. 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] The technical solution adopted in this invention is as follows:

[0005] An optical lens comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0006] The first lens with negative optical power has a convex object side and a concave image side.

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

[0008] A third lens with negative optical power has a concave object side and a convex image side.

[0009] The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0010] The fifth lens with negative optical power has a convex object-side surface and a concave image-side surface.

[0011] The sixth lens with negative optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0012] The seventh lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0013] The combined focal length f123 of the first, second, and third lenses and the combined focal length f4567 of the fourth, fifth, sixth, and seventh lenses satisfy the following condition: 0.8 <f123 / f4567<2.1。

[0014] More preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3.4 < TTL / f < 3.6; 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: 1.15 < TTL / IH < 1.3.

[0015] More preferably, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.7 < IH / f < 2.9; the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 1.85 < 180°×TTL / IH / FOV < 2.1.

[0016] More 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: 39° < f×FOV / IH < 41°; the maximum field angle FOV of the optical lens and the principal ray incident angle CRA at the maximum image height of the optical lens satisfy: 5.5 < FOV / (CRA / 2) < 5.7.

[0017] More preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.5 < f1 / f < -1.3; the object-side curvature radius R1 of the first lens, the image-side curvature radius R2 of the first lens and the central thickness CT1 of the first lens satisfy: 4.5 < (R1 - R2) / CT1 < 16.5.

[0018] More preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2 < f2 / f < 1.4; the object-side curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 1.1; the image-side curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.7.

[0019] More preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -17.3 < f3 / f < -9.2; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f4 / f < 1.4.

[0020] More preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -3.1 < f5 / f < -1.9; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2 < f6 / f < -1.5.

[0021] More preferably, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7 < f7 / f < 2.3; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R13 / f < 0.8; 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: 1 < R14 / f < 1.7.

[0022] More preferably, the sagittal height Sag3 of the object side clear aperture of the second lens and the object side clear aperture diameter d3 of the second lens satisfy: 0.2 < Sag3 / d3 < 0.24; the sagittal height Sag4 of the image side clear aperture of the second lens and the image side clear aperture diameter d4 of the second lens satisfy: -0.18 < Sag4 / d4 < -0.12.

[0023] The optical lens provided by the present invention uses seven lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberration, and enhance the imaging quality of the optical lens, endowing the lens with one or more advantages such as large wide-angle, small distortion, large target surface, and high pixel. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 2 is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 is an F-Tan(Theta) distortion curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 4 is an axial aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 5 is a lateral chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 6 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 7 is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 8This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 13 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] The optical lens provided in this embodiment of the invention consists of seven lenses with optical power, which are arranged sequentially along the optical axis from the object side to the imaging plane as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0049] In some embodiments, the first lens may have a negative optical power, its object side may be convex, and its image side may be concave. The second lens may have a positive optical power, its object side may be convex, and its image side may be convex. The third lens may have a negative optical power, its object side may be concave, and its image side may be convex. The fourth lens may have a positive optical power, its object side may be convex, and its image side may be convex. The fifth lens may have a negative optical power, its object side may be convex; its image side may be concave. The sixth lens may have a negative optical power, its object side may be convex near the optical axis, and its image side may be concave near the optical axis. The seventh lens may have a positive optical power, its object side may be convex near the optical axis, and its image side may be concave near the optical axis.

[0050] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the third lens and the fourth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the imaging. When the aperture is located between the third lens and the fourth lens, it is convenient for correcting the aperture aberration.

[0051] In some embodiments, the optical lens may further include a filter, and the filter may be disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0052] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.8 < f123 / f4567 < 2.1. By satisfying the above range and reasonably limiting the focal length ratio of the lens groups before and after the aperture of the optical lens, the aberration generated by the lens groups before and after the aperture can be effectively corrected, and the imaging quality of the optical lens can be improved. More specifically: 0.8 < f123 / f4567 < 2.09.

[0053] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3.4 < TTL / f < 3.6; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.15 < TTL / IH < 1.3. By satisfying the above range, it is beneficial to realize the large target surface characteristic of the optical lens and be able to be paired with a 1 / 1.56-inch large-bottom chip. It is also beneficial to achieve the balance between the volume and the large image surface of the optical lens and realize high-pixel imaging of the lens. More specifically: 3.44 < TTL / f < 3.6; 1.19 < TTL / IH < 1.3.

[0054] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.7 < IH / f < 2.9; the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 1.85 < 180°×TTL / IH / FOV < 2.1. Meeting the above ranges, by reasonably controlling the ratio of the image height and focal length of the optical lens, the large image plane characteristic can be achieved, and the imaging quality can be improved. And it is beneficial to balance the relationship among the total length, image height and field angle of the optical lens. More specifically: 2.78 < IH / f < 2.88; 1.89 < 180°×TTL / IH / FOV < 2.06.

[0055] In some embodiments, 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: 39° < f×FOV / IH < 41°; the maximum field angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 5.5 < FOV / (CRA / 2) < 5.7. Meeting the above ranges, by reasonably restricting the relationship among the focal length, field angle and image height of the optical lens, it is beneficial to achieve the balance of the large field angle and large target surface imaging of the optical lens. At the same time, reasonably restricting the ratio of the field angle and the chief ray angle of incidence of the optical lens can provide a large field angle, improve the photosensitive performance, and achieve the shooting effect of wide angle and high pixels. More specifically: 39.69° < f×FOV / IH < 40.47°; 5.57 < FOV / (CRA / 2) < 5.63.

[0056] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.5 < f1 / f < -1.3; the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, and the central thickness CT1 of the first lens satisfy: 4.5 < (R1 - R2) / CT1 < 16.5. Meeting the above ranges, by reasonably limiting the proportion of the optical power of the first lens and the relationship between the surface shape and thickness of the first lens, it is beneficial to slow down the change degree of the refraction angle of the incident light, avoid excessive aberration caused by too strong refraction change, and is also beneficial to lens processing and improve the yield. More specifically: -1.46 < f1 / f < -1.38; 4.53 < (R1 - R2) / CT1 < 16.45.

[0057] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2 < f2 / f < 1.4; the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 1.1; the radius of curvature R4 of the image side surface of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.7. Meeting the above ranges, by reasonably defining the proportion of the optical power of the second lens and its surface shape, it is beneficial to converge light and improve the clarity of imaging. More specifically: 1.28 < f2 / f < 1.39; 1.03 < R3 / f < 1.09; -2.19 < R4 / f < -1.76.

[0058] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -17.3 < f3 / f < -9.2; the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f4 / f < 1.4. Meeting the above ranges, by reasonably defining the proportion of the optical power of the third lens and the fourth lens, it is possible to effectively balance the lens aberration and improve the imaging quality. More specifically: -17.23 < f3 / f < -9.25; 1.27 < f4 / f < 1.37.

[0059] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -3.1 < f5 / f < -1.9; the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2 < f6 / f < -1.5. Meeting the above ranges, by reasonably defining the proportion of the optical power of the fifth lens and the sixth lens, it is possible to effectively balance the lens aberration and is beneficial to increasing the imaging area of the optical lens. More specifically: -3.07 < f5 / f < -1.96; -1.92 < f6 / f < -1.55.

[0060] In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy: 1.7 < f7 / f < 2.3; the radius of curvature R13 of the object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R13 / f < 0.8; 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: 1 < R14 / f < 1.7. Meeting the above ranges, by reasonably defining the proportion of the optical power of the seventh lens and its surface shape, it is beneficial to achieve large target surface imaging and can better match the backend chip. More specifically: 1.72 < f7 / f < 2.27; 0.57 < R13 / f < 0.77; 1.03 < R14 / f < 1.64.

[0061] In some embodiments, the sagittal height Sag3 of the clear aperture semi-diameter on the object side of the second lens and the clear aperture semi-diameter d3 of the object side of the second lens satisfy: 0.2 < Sag3 / d3 < 0.24; the sagittal height Sag4 of the clear aperture semi-diameter on the image side of the second lens and the clear aperture semi-diameter d4 of the image side of the second lens satisfy: -0.18 < Sag4 / d4 < -0.12. Meeting the above ranges helps to control the light trend and highlight the detailed information of the central field of view of the optical lens.

[0062] 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: 5.8 < IH / EPD < 6. Meeting the above range is beneficial to ensuring a large light transmission amount and can reasonably distribute light on the imaging surface. In a scene with complex light conditions, it can also enable the imaging sensor to receive sufficient and uniform light, thereby presenting a properly bright image. More specifically: 5.8 < IH / EPD < 5.98.

[0063] In some embodiments, the sum ΣCT 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: 0.49 < ΣCT / TTL < 0.52. Meeting the above range, controlling the total optical length of the optical lens and the sum of the central thicknesses of each lens within a reasonable range can facilitate the structural design and processing and further improve the imaging quality.

[0064] In some embodiments, the sum ΣCT of the central thicknesses of the first lens to the seventh lens along the optical axis respectively and the effective focal length f of the optical lens satisfy: 1.7 < ΣCT / f < 1.9. Meeting the above range can effectively correct the field curvature and distortion of the optical lens and improve the imaging quality of the optical lens. More specifically: 1.72 < ΣCT / f < 1.82.

[0065] In some embodiments, the clear aperture semi-diameter d1 on the object side of the first lens, the true image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 0.5 < d1 / (IH / 2) / tan(FOV / 2) < 0.6. Meeting the above range is beneficial to meeting the requirements of the optical lens having a large field angle and a large image plane. More specifically: 0.53 < d1 / (IH / 2) / tan(FOV / 2) < 0.6.

[0066] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 2.1 < R1 / f < 5.9; the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.5 < R2 / f < 0.7. Meeting the above ranges and reasonably setting the surface shape of the first lens is beneficial to obtaining a wider field of view without changing the physical size of the lens. More specifically: 2.16 < R1 / f < 5.88; 0.52 < R2 / f < 0.68.

[0067] In some embodiments, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -0.62 < R3 / R4 < -0.48; the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: -0.35 < (R3 + R4) / (R3 - R4) < -0.23. Meeting the above ranges and reasonably limiting the surface shape of the second lens helps to adjust the light propagation path and lay a foundation for subsequent good imaging.

[0068] In some embodiments, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.42 < R13 / R14 < 0.57; the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -0.41 < (R13 - R14) / (R13 + R14) < -0.27. Meeting the above ranges and reasonably limiting the surface shape of the seventh lens helps the light to accurately focus on the imaging plane and improve the clarity and brightness uniformity of the image.

[0069] In some embodiments, the optical lens satisfies the following conditional expressions: 3.6 mm < f < 3.9 mm; 112° < FOV < 115°; 1.7 mm < EPD < 1.9 mm; 13.1 mm < TTL < 13.3 mm; 2 < Fno < 2.1; 10 mm < IH < 11 mm; 40° < CRA < 41°; 1 mm < BFL < 1.3 mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view angle of the optical lens, CRA represents the principal ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as large wide angle, small distortion, large target surface, and high pixel. More specifically: 3.66 mm < f < 3.81 mm; 112.9° < FOV < 114.1°; 1.75 mm < EPD < 1.84 mm; 13.11 mm < TTL < 13.21 mm; 2.07 < Fno < 2.09; 10.23 mm < IH < 10.93 mm; 40.5° < CRA < 40.62°; 1.08 mm < BFL < 1.27 mm.

[0070] 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. Additionally, 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 can make the structure of the lens relatively compact, significantly reduce the overall weight of the lens, and reduce the manufacturing cost.

[0071] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses, and can also maintain good imaging quality within a larger field of view range, thus expanding the shooting range. 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 all adopt aspherical lenses.

[0072] 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:

[0073]

[0074] 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.

[0075] 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.

[0076] Example 1

[0077] 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 plane, 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.

[0078] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.

[0079] The second lens L2 has positive optical power, its object side S3 is convex, and its image side S4 is convex.

[0080] The third lens L3 has negative optical power, its object side S5 is concave, and its image side S6 is convex.

[0081] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is convex.

[0082] The fifth lens L5 has negative optical power, its object side S9 is convex, and its image side S10 is concave.

[0083] The sixth lens L6 has negative optical power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0084] The seventh lens L7 has positive optical power, its object side S13 is convex near the optical axis, and its image side S14 is concave near the optical axis.

[0085] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0086] The imaging plane S17 is a plane.

[0087] 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 plastic aspherical lenses.

[0088] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0089] Table 1-1

[0090]

[0091] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0092] Table 1-2

[0093] Face number K B C D S1 -1.13E+01 -1.30E-03 1.50E-05 6.23E-07 S2 -6.14E-01 -4.01E-03 1.78E-04 -7.98E-05 S3 -4.81E-01 -1.34E-03 -1.71E-04 -3.88E-05 S4 -1.46E+01 1.80E-03 -1.55E-03 -5.74E-06 S5 3.34E+00 -4.40E-03 -2.41E-03 -1.90E-04 S6 3.67E+01 -3.32E-03 -2.74E-03 2.50E-04 S7 1.84E+00 1.81E-02 -5.94E-03 6.78E-04 S8 7.96E-01 2.62E-03 -1.12E-03 -2.72E-04 S9 -2.36E+01 -2.01E-02 -3.70E-03 1.72E-03 S10 -3.25E+00 -9.20E-03 6.31E-03 -5.27E-04 S11 -1.37E+02 -2.03E-02 -2.75E-03 8.53E-04 S12 -2.46E+01 -1.29E-02 -5.74E-04 2.57E-04 S13 -2.26E+01 -4.26E-03 1.41E-04 -8.50E-06 S14 -6.41E+01 -3.83E-03 5.61E-05 5.90E-06 Face number E F G H S1 -5.25E-09 -8.92E-10 7.23E-12 1.65E-13 S2 -6.99E-07 2.29E-07 1.07E-07 -2.39E-08 S3 -1.31E-05 1.85E-06 -4.11E-08 -1.16E-07 S4 1.19E-06 1.09E-06 3.02E-07 -6.49E-08 S5 1.17E-04 1.40E-05 -2.01E-07 -5.17E-07 S6 1.80E-04 6.96E-05 -4.30E-05 6.84E-06 S7 4.92E-04 -5.61E-05 -6.66E-05 2.72E-05 S8 2.84E-04 1.16E-04 -7.61E-05 2.48E-05 S9 -3.34E-04 -4.16E-05 1.01E-04 -2.70E-05 S10 -6.49E-06 4.03E-05 -1.35E-06 -3.98E-06 S11 -1.57E-04 -2.40E-06 1.30E-06 2.75E-07 S12 -3.08E-05 -6.03E-07 5.42E-07 -3.58E-08 S13 6.04E-07 1.50E-08 -1.74E-09 2.19E-11 S14 -1.27E-07 -1.56E-08 -4.31E-10 3.74E-11

[0094] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown.

[0095] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light of different wavelengths 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 field curvature of the meridional and sagittal image planes is controlled within ±0.04 mm, indicating that the optical lens 100 can effectively correct the field curvature.

[0096] Figure 3 The F-Tan (Theta) distortion curve of Example 1 is shown, which represents the F-Tan (Theta) distortion at different image heights on the imaging plane. The horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tan (Theta) distortion of the optical lens 100 is controlled within -10% to 0%, indicating that the distortion of the optical lens 100 is well corrected.

[0097] Figure 4 The diagram shows the axial aberration curves for Embodiment 1, which represent the aberrations of each wavelength along 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 diagram, the axial aberration offset is controlled within ±0.01 mm, indicating that the optical lens 100 can effectively correct axial aberrations.

[0098] Figure 5 The diagram shows the transverse chromatic aberration curves for Example 1, representing 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 diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1 μm to 2 μm, indicating that the optical lens 100 can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0099] Example 2

[0100] Please see Figure 6 The figure shown is 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 optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0101] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0102] Table 2-1

[0103]

[0104]

[0105] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0106] Table 2-2

[0107] Face number K B C D S1 4.29E+00 -9.83E-04 5.29E-07 5.39E-07 S2 -5.81E-01 -5.26E-04 6.81E-05 -6.48E-05 S3 -1.25E+00 -2.16E-03 -6.16E-04 4.33E-05 S4 3.99E+00 1.57E-03 -3.90E-04 1.01E-05 S5 -7.69E+00 2.82E-03 5.98E-05 -1.35E-04 S6 -1.59E+01 6.45E-03 -7.66E-05 4.27E-06 S7 -4.22E+00 5.31E-03 -1.03E-03 -1.17E-04 S8 5.08E+00 -8.48E-03 2.36E-04 2.14E-04 S9 -3.11E+01 -1.51E-03 -3.07E-03 9.34E-05 S10 -7.41E-01 1.78E-03 -6.25E-04 2.18E-04 S11 -1.97E+02 -1.31E-02 -4.42E-03 6.93E-04 S12 -2.23E+01 -8.59E-03 -1.35E-03 2.35E-04 S13 -1.42E+01 -3.06E-03 -1.83E-05 -5.63E-06 S14 -1.98E+01 -3.47E-03 8.31E-05 2.25E-07 Face number E F G H S1 -2.34E-09 -3.67E-10 -5.62E-12 -4.93E-14 S2 7.59E-06 -3.17E-07 1.21E-09 -3.54E-09 S3 -1.69E-05 1.46E-06 6.10E-08 5.61E-09 S4 6.87E-06 1.00E-06 3.23E-08 4.26E-08 S5 1.61E-08 7.46E-06 7.89E-06 -1.68E-06 S6 1.01E-04 1.21E-05 -1.32E-06 2.20E-06 S7 3.07E-05 5.10E-05 -2.33E-06 1.11E-06 S8 -5.31E-05 1.78E-05 -2.83E-06 3.87E-06 S9 -8.48E-05 4.74E-05 3.45E-06 -3.36E-06 S10 -3.11E-07 1.62E-06 -2.29E-06 -2.14E-08 S11 -4.21E-05 -1.74E-06 4.56E-07 -1.79E-07 S12 -1.04E-05 -6.02E-07 7.81E-08 -3.46E-09 S13 5.30E-07 4.80E-09 -2.11E-10 -1.49E-11 S14 -1.66E-07 -2.26E-09 3.90E-11 2.61E-12

[0108] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0109] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.06mm to 0.03mm, indicating that the optical lens 200 can correct the field curvature well.

[0110] from Figure 8 As can be seen, the F-Tan (Theta) distortion of the optical lens is controlled within -8% to 1%, indicating that the distortion of the optical lens 200 has been well corrected.

[0111] from Figure 9 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.03mm, indicating that the optical lens 200 can correct axial aberration well.

[0112] from Figure 10 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 3μm, indicating that the optical lens 200 can effectively correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0113] Example 3

[0114] Please see Figure 11 The figure shown is 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 optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0115] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0116] Table 3-1

[0117]

[0118] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0119] Table 3-2

[0120]

[0121]

[0122] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0123] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.1mm to 0.09mm, indicating that the optical lens 300 can correct the field curvature well.

[0124] from Figure 13 As can be seen, the F-Tan (Theta) distortion of the optical lens is controlled within -8% to 0%, indicating that the distortion of the optical lens 300 has been well corrected.

[0125] from Figure 14As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens 300 can correct axial aberration well.

[0126] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 2μm, indicating that the optical lens 300 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0127] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, principal ray incident angle CRA at maximum image height, true image height IH corresponding to maximum field of view, maximum field of view FOV, entrance pupil diameter EPD, back focal length BFL, and the values ​​corresponding to each conditional expression in each embodiment.

[0128] Table 4

[0129]

[0130]

[0131] In summary, the optical lens provided by the present invention employs seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as wide angle, low distortion, large target area, and high pixel count.

[0132] 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.

[0133] 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, in total seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a third lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a fifth lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a sixth lens with negative refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface at the near optical axis; a seventh lens with positive refractive power, the object side surface of which is a convex surface at the near optical axis, and the image side surface of which is a concave surface at the near optical axis; wherein the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: 0.8 < f123 / f4567 < 2.

1.

2. The optical lens of claim 1, wherein, The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 3.4 < TTL / f < 3.6; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 1.15 < TTL / IH < 1.

3.

3. The optical lens of claim 1, wherein, The real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2.7 < IH / f < 2.9; the total optical length TTL of the optical lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy: 1.85 < 180°×TTL / IH / FOV < 2.

1.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens, the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 39° < f×FOV / IH < 41°; the maximum field angle FOV of the optical lens and the chief ray angle of incidence CRA at the maximum image height of the optical lens satisfy: 5.5 < FOV / (CRA / 2) < 5.

7.

5. The optical lens of claim 1, wherein, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.5 < f1 / f < -1.3; the object side surface curvature radius R1 of the first lens, the image side surface curvature radius R2 of the first lens and the central thickness CT1 of the first lens satisfy: 4.5 < (R1-R2) / CT1 < 16.

5.

6. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.2 < f2 / f < 1.4; the object side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens satisfy: 1 < R3 / f < 1.1; the image side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens satisfy: -2.2 < R4 / f < -1.

7.

7. The optical lens of claim 1, wherein, A focal length f3 of the third lens and an effective focal length f of the optical lens satisfy: -17.3 < f3 / f < -9.2; a focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f4 / f < 1.

4.

8. The optical lens of claim 1, wherein, A focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy: -3.1 < f5 / f < -1.9; a focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -2 < f6 / f < -1.

5.

9. The optical lens of claim 1, wherein, A focal length f7 of the seventh lens and an effective focal length f of the optical lens satisfy: 1.7 < f7 / f < 2.3; a radius of curvature R13 of an object side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 0.5 < R13 / f < 0.8; a radius of curvature R14 of an image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 1 < R14 / f < 1.

7.

10. The optical lens of claim 1, wherein, A sagittal height Sag3 of an object side surface of the second lens at a half entrance pupil diameter and a half entrance pupil diameter d3 of the object side surface of the second lens satisfy: 0.2 < Sag3 / d3 < 0.24; a sagittal height Sag4 of an image side surface of the second lens at a half entrance pupil diameter and a half entrance pupil diameter d4 of the image side surface of the second lens satisfy: -0.18 < Sag4 / d4 < -0.12.

Images