Optical lens

Abstract

The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with positive optical power, whose object side is convex and whose image side is concave near the optical axis; a second lens with negative optical power, whose object side is concave and whose image side is concave; a third lens with optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; a fourth lens with positive optical power, whose image side is convex; a fifth lens with negative optical power, whose object side is concave and whose image side is concave; wherein, the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 46 < 180° × TTL / IH / FOV < 51. The optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens through specific surface shape settings and reasonable optical power distribution.

Description

Technical Field

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

[0002] Currently, with the popularization of portable electronic devices and the popularity of social, video, and live streaming software, people's love for photography is increasing. Camera lenses have become a standard configuration for electronic devices, and even the primary consideration for consumers when purchasing electronic devices. In order to improve the imaging quality of distant objects, most flagship mobile phones are equipped with a telephoto optical lens, which can clearly magnify the scenery when shooting a distant view, effectively blur the background and highlight the subject, thus improving the quality of mobile phone photography. However, although the common five-element optical lens already has good optical performance, the lens cannot simultaneously meet the design requirements of ultra-long focal length and high imaging quality, affecting the user's shooting experience. Summary of the Invention

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

[0004] The technical solution adopted by the present invention is as follows:

[0005] An optical lens, comprising a total of five lenses, which are sequentially arranged along the optical axis from the object side to the imaging surface:

[0006] A first lens with a positive optical power, the object side surface thereof is convex, and the image side surface thereof is concave near the optical axis;

[0007] A second lens with a negative optical power, the object side surface thereof is concave, and the image side surface thereof is concave;

[0008] A third lens with an optical power, the object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis;

[0009] A fourth lens with a positive optical power, the image side surface thereof is convex;

[0010] A fifth lens with a negative optical power, the object side surface thereof is concave, and the image side surface thereof is concave;

[0011] Wherein, the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 46 < 180°×TTL / IH / FOV < 51.

[0012] Further preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 0.75 < TTL / f < 0.85; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3.3 < TTL / IH < 3.7.

[0013] Further preferably, the effective focal length f of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the FOV of the maximum field of view angle of the optical lens satisfy: 1 < (IH / 2) / (f×Tan(FOV / 2)) < 1.02; the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 2.8° < FOV / Fno < 2.9°.

[0014] Further preferably, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < IH / EPD < 1.05; the true image height IH corresponding to the maximum field of view angle of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < IH / BFL < 1.

[0015] Further preferably, the half clear aperture d1 of the object side of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the FOV of the maximum field of view angle of the optical lens satisfy: 8.5 < d1 / (IH / 2) / tan(FOV / 2) < 8.8; the half clear aperture d1 of the object side of the first lens and the half clear aperture d10 of the image side of the fifth lens satisfy: 1.3 < d1 / d10 < 1.4; the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.35 < f / IH < 4.45.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.35 < f1 / f < 0.5; the effective focal length f of the optical lens and the object side curvature radius R1 of the first lens satisfy: 0.15 < R1 / f < 0.25; the effective focal length f of the optical lens and the image side curvature radius R2 of the first lens satisfy: 1.8 < R2 / f < 2.2.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.55 < f2 / f < -0.25; the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: 0.3 < (R3 + R4) / (R3 - R4) < 0.7.

[0018] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.35 < f4 / f < 0.45; the focal length f4 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy: -13.5 < R8 / f4 < -0.5.

[0019] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.5 < f5 / f < -0.25; the effective focal length f of the optical lens and the object-side curvature radius R9 of the fifth lens satisfy: -0.35 < R9 / f < -0.2; the effective focal length f of the optical lens and the image-side curvature radius R10 of the fifth lens satisfy: 0.45 < R10 / f < 5.

[0020] More preferably, the focal length f3 of the third lens and the object-side curvature radius R7 of the fourth lens satisfy: 6.6 < f3 / R7 < 52.8; the object-side curvature radius R5 of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R5 / f < 8.5; the image-side curvature radius R6 of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R6 / f < 3.3.

[0021] More preferably, the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -0.5 < R9 / R10 < 0; the object-side curvature radius R9 of the fifth lens and the image-side curvature radius R10 of the fifth lens satisfy: -1 < (R9 + R10) / (R9 - R10) < -0.3.

[0022] Compared with the prior art, the optical lens provided by the present invention can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens through specific surface shape settings and reasonable optical power distribution, enabling the lens to have one or more advantages such as ultra-long focal length, large target surface, small distortion, and high pixel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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, wherein:

[0024] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0025] Figure 2 is a field curvature curve graph of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 3 is an F-Theta distortion curve graph of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 4 It is the axial aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 5 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 6 It is the structural schematic diagram of the optical lens in Embodiment 2 of the present invention.

[0030] Figure 7 It is the field curvature curve graph of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 8 It is the F-Theta distortion curve graph of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 9 It is the axial aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 10 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 11 It is the structural schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0035] Figure 12 It is the field curvature curve graph of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 13 It is the F-Theta distortion curve graph of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 14 It is the axial aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 15 It is the lateral chromatic aberration curve graph of the optical lens in Embodiment 3 of the present invention.

[0039] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0040] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, for ease of explanation, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustration only and are not drawn to an exact scale.

[0043] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0044] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms (including technical and scientific terms) used in this text have the same meaning as the ordinary understanding of those 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.

[0046] 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 refer to the drawings and combine with the embodiments to detail the present application.

[0047] The optical lens provided by the embodiment of the present invention has a total of five lenses, which are, in order from the object side to the imaging surface along the optical axis, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

[0048] In some embodiments, the first lens may have a positive focal power, with its object side being convex and its image side being concave near the optical axis. The second lens may have a negative focal power, with its object side being concave and its image side being concave. The third lens may have a positive or negative focal power, with its object side being convex near the optical axis and its image side being concave near the optical axis. The fourth lens may have a positive focal power, with its object side being either concave or convex and its image side being convex. The fifth lens may have a negative focal power, with its object side being concave and its image side being concave.

[0049] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image formation.

[0050] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the fifth 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.

[0051] In some embodiments, the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: 46 < 180°×TTL / IH / FOV < 51. Meeting the above range is beneficial to balancing the relationship among the total length, image height, and field of view angle of the optical lens. More specifically, 46.77 < 180°×TTL / IH / FOV < 50.33.

[0052] In some embodiments, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 0.75 < TTL / f < 0.85. Meeting the above range can effectively limit the length of the lens, which is beneficial to realizing the miniaturization of the optical lens and also has an ultra-long focal length. More specifically, 0.75 < TTL / f < 0.84.

[0053] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3.3 < TTL / IH < 3.7. Meeting the above range is beneficial to realizing large image plane imaging while shortening the total optical length, achieving the balance between the miniaturization of the optical lens and large image plane imaging. More specifically, 3.32 < TTL / IH < 3.64.

[0054] In some embodiments, the effective focal length f of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the FOV of the maximum field of view angle of the optical lens satisfy: 1 < (IH / 2) / (f×Tan(FOV / 2)) < 1.02. When the above range is satisfied, the optical distortion of the optical lens is better controlled, the resolution of the optical lens is improved, and a better imaging effect can be obtained.

[0055] In some embodiments, the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 2.8° < FOV / Fno < 2.9°. When the above range is satisfied, it is defined that the optical lens has a suitable field of view angle and aperture value, and good imaging quality can be obtained. More specifically, 2.83° < FOV / Fno < 2.9°.

[0056] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < IH / EPD < 1.05. When the above range is satisfied, the width of the light beam incident on the optical lens can be increased, the relative illumination can be improved, and vignetting can be avoided. More specifically, 1.01 < IH / EPD < 1.04.

[0057] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < IH / BFL < 1. When the above range is satisfied, it is beneficial to ensure that the optical system has a long back focal length, and the distribution of the lenses in the optical lens in space can be reasonably allocated to achieve high pixels. More specifically, 0.83 < IH / BFL < 0.96.

[0058] In some embodiments, the semi-aperture d1 of the object side of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens, and the FOV of the maximum field of view angle of the optical lens satisfy: 8.5 < d1 / (IH / 2) / tan(FOV / 2) < 8.8. When the above range is satisfied, it is possible to have a small front port diameter while satisfying the optical lens with a large field of view angle and a large image plane, which is beneficial to the miniaturization of the optical lens. More specifically, 8.52 < d1 / (IH / 2) / tan(FOV / 2) < 8.73.

[0059] In some embodiments, the semi-aperture d1 of the object side of the first lens and the semi-aperture d10 of the image side of the fifth lens satisfy: 1.3 < d1 / d10 < 1.4. When the above range is satisfied, the aperture ratio of the first lens and the fifth lens is reasonably matched, which is convenient for structural design and helps to improve the imaging quality of the optical lens. More specifically, 1.31 < d1 / d10 < 1.36.

[0060] In some embodiments, the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.35 < f / IH < 4.45. Meeting the above range helps to achieve a long focal length and a large image plane, and improve the imaging quality of the optical lens. More specifically, 4.36 < f / IH < 4.41.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.35 < f1 / f < 0.5; the effective focal length f of the optical lens and the curvature radius R1 of the object side surface of the first lens satisfy: 0.15 < R1 / f < 0.25; the effective focal length f of the optical lens and the curvature radius R2 of the image side surface of the first lens satisfy: 1.8 < R2 / f < 2.2. Meeting the above range, by reasonably setting the focal length and surface shape of the first lens, the light entering the first lens can be well converged into the optical system, increasing the light flux, which is beneficial to reducing the difficulty of aberration correction and ensuring the imaging quality of the optical lens. More specifically, 0.36 < f1 / f < 0.46; 0.18 < R1 / f < 0.24; 1.82 < R2 / f < 2.14.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.55 < f2 / f < -0.25; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.3 < (R3 + R4) / (R3 - R4) < 0.7. Meeting the above range, by reasonably setting the focal length and surface shape of the second lens, it is beneficial to avoid excessive light deflection caused by the over-concentration of the optical power of the first lens, reduce the difficulty of aberration correction, and at the same time is beneficial to achieving large-image-plane imaging of the lens. More specifically, -0.52 < f2 / f < -0.29; 0.31 < (R3 + R4) / (R3 - R4) < 0.7.

[0063] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.35 < f4 / f < 0.45; the focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -13.5 < R8 / f4 < -0.5. Meeting the above range, by reasonably setting the focal length of the fourth lens and the surface shape of the image side surface, the light can be effectively converged, the light path direction can be controlled, and the difficulty of aberration correction can be reduced. More specifically, 0.36 < f4 / f < 0.44; -13.45 < R8 / f4 < -0.53.

[0064] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.5 < f5 / f < -0.25; the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -0.35 < R9 / f < -0.2; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.45 < R10 / f < 5. Meeting the above ranges and reasonably setting the focal length and surface shape of the fifth lens are beneficial to achieving a large image surface and are conducive to balancing various aberrations of the optical lens, thereby improving the overall imaging quality. More specifically, -0.49 < f5 / f < -0.26; -0.32 < R9 / f < -0.21; 0.46 < R10 / f < 4.97.

[0065] In some embodiments, the focal length f3 of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 6.6 < f3 / R7 < 52.8; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R5 / f < 8.5; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R6 / f < 3.3. Meeting the above ranges and reasonably matching the positive and negative optical powers of the third lens and the surface shape of the object side surface of the fourth lens can control the combination of the third lens with negative optical power and the concave object side surface of the fourth lens, and the combination of the third lens with positive optical power and the convex object side surface of the fourth lens, which helps the fourth lens receive more light from the front-end lens, improves the ability to converge marginal field light, and improves the imaging quality of the marginal field. More specifically, 6.64 < f3 / R7 < 52.73; 0.19 < R5 / f < 8.47; 0.17 < R6 / f < 3.26.

[0066] 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: -0.5 < R9 / R10 < 0; 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 < (R9 + R10) / (R9 - R10) < -0.3. Meeting the above ranges and controlling the surface shape of the fifth lens are beneficial to increasing the imaging area and field angle of the optical lens, are conducive to balancing the aberrations of the optical lens, and improve the imaging quality of the optical lens. More specifically, -0.48 < R9 / R10 < -0.04; -0.91 < (R9 + R10) / (R9 - R10) < -0.35.

[0067] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis satisfy: 0.25 < ∑CT / TTL < 0.5. Meeting the above range can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens. More specifically, 0.28 < ∑CT / TTL < 0.5.

[0068] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the fifth lens along the optical axis and the effective focal length f of the optical lens satisfy: 0.2 < ∑CT / f < 0.45. 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, 0.21 < ∑CT / f < 0.42.

[0069] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.7 < |f3 / f| < 13.6. Meeting the above range, the third lens can be a positive or negative focal power, so that the positive and negative of the focal power of the third lens are reasonably matched with the surface shape of the object side of the fourth lens. More specifically, 2.71 < |f3 / f| < 13.52.

[0070] In some embodiments, the combined focal length f12 of the first lens and the second lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 1.6 < f12 / f34 < 16.4. Meeting the above range, by reasonably setting the relationship between the focal powers of the combined focal length of the first lens and the second lens and the combined focal length of the third lens and the fourth lens in the lens, the incident light can be converged to a certain extent, which is beneficial to achieving the long focal length performance of the lens. More specifically, 1.62 < f12 / f34 < 16.34.

[0071] In some embodiments, the sagittal height Sag1 of the object side clear aperture of the first lens and the object side clear aperture d1 of the first lens satisfy: 0.25 < Sag1 / d1 < 0.31; the sagittal height Sag10 of the image side clear aperture of the fifth lens and the image side clear aperture d10 of the second lens satisfy: 0.02 < |Sag10 / d10| < 0.09. Meeting the above range helps to control the trend of the marginal field light and highlight the detailed information of the central field of the optical lens.

[0072] In some embodiments, the optical lens satisfies the conditional formula: 37 mm < f < 38 mm, 8.4 mm < EPD < 8.5 mm, 28 mm < TTL < 32 mm, 4.4 < Fno < 4.6, 12.5° < CRA < 13°, 9 mm < BFL < 11 mm, 12.5° < FOV < 13.5°, 8.5 mm < IH < 8.8 mm; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the overall optical length of the optical lens, Fno represents the aperture value of the optical lens, CRA represents the principal ray incident angle at the maximum image height of the optical lens, BFL represents the back focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of long focal length and large target surface. More specifically, 37.88 mm < f < 37.91 mm, 8.41 mm < EPD < 8.43 mm, 28.63 mm < TTL < 31.51 mm, 4.49 < Fno < 4.51, 12.77° < CRA < 12.99°, 9.02 mm < BFL < 10.32 mm, 12.79° < FOV < 13.01°, 8.6 mm < IH < 8.68 mm.

[0073] 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 due to 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 between the miniaturization of the lens and high image quality.

[0074] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth 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, and the fifth lens of the present invention can all adopt aspherical lenses.

[0075] In each embodiment of the present invention, when the lens adopts an aspherical lens, the surface shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0076] ;

[0077] Among them, z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H, I, J are the conic coefficients of the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order surfaces respectively.

[0078] The present invention will be further described below with multiple embodiments. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are partially different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0079] Embodiment 1

[0080] Please refer to Figure 1 , which shows a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a diaphragm ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0081] Among them, the first lens L1 has a positive optical power. Its object side S1 is a convex surface, and its image side S2 is a concave surface near the optical axis;

[0082] The second lens L2 has a negative optical power. Its object side S3 is a concave surface, and its image side S4 is a concave surface;

[0083] The third lens L3 has a negative optical power. Its object side S5 is a convex surface near the optical axis, and its image side S6 is a concave surface near the optical axis;

[0084] The fourth lens L4 has a positive optical power. Its object side S7 is a concave surface, and its image side S8 is a convex surface;

[0085] The fifth lens L5 has a negative optical power. Its object side S9 is a concave surface, and its image side S10 is a concave surface;

[0086] The object side S11 and the image side S12 of the filter G1 are both flat surfaces;

[0087] The imaging surface S13 is a flat surface.

[0088] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 all adopt plastic aspherical lenses.

[0089] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0090] Table 1-1

[0091]

[0092] The surface parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0093] Table 1-2

[0094]

[0095] In this embodiment, the field curvature curve graph, F-Theta distortion curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 100 are respectively as Figure 2 , Figure 3 , Figure 4 , Figure 5 shown.

[0096] Figure 2 shows the field curvature curve graph of Embodiment 1, which represents the field curvature of light rays in the meridional image plane and the sagittal image plane. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the semi-field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.3 mm to 0.1 mm, indicating that the optical lens 100 can correct the field curvature well.

[0097] Figure 3 shows the F-Theta distortion curve graph of Embodiment 1, which represents the F-Theta distortion at different image heights on the imaging plane. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the semi-field angle (unit: °). It can be seen from the figure that the F-Theta distortion of the optical lens 100 is controlled within 0 to 1.5%, indicating that the distortion of the optical lens 100 is well corrected.

[0098] Figure 4 shows the axial aberration curve graph of Embodiment 1 of this embodiment, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within -0.05 mm to 0.15 mm, indicating that the optical lens 100 can correct the axial aberration better.

[0099] Figure 5The vertical chromatic aberration curve diagram of Embodiment 1 is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging surface. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle. It can be seen from the figure that the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, indicating that the optical lens 100 can excellently correct the chromatic aberration of each field of view.

[0100] Embodiment 2

[0101] Please refer to Figure 6 , which shows the structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present invention. Compared with Embodiment 1, the main differences are as follows: the third lens L3 has a positive optical power; the object side surface S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0103] Table 2-1

[0104]

[0105] The surface type parameters of the aspherical lenses in the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0106] Table 2-2

[0107]

[0108] In this embodiment, the field curvature curve diagram, F-Theta distortion curve diagram, axial aberration curve diagram, and vertical chromatic aberration curve diagram of the optical lens 200 are respectively as Figure 7 , Figure 8 , Figure 9 , Figure 10 shown.

[0109] It can be seen from Figure 7 that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.2 mm to 0.1 mm, indicating that the optical lens 200 can well correct the field curvature.

[0110] It can be seen from Figure 8 that the F-Theta distortion of the optical lens 200 is controlled within 0 to 0.6%, indicating that the distortion of the optical lens 200 is well corrected.

[0111] It can be seen from Figure 9 that the offset of the axial aberration is controlled within -0.05 mm to 0.15 mm, indicating that the optical lens 200 can better correct the axial aberration.

[0112] It can be seen from Figure 10 that the lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can excellently correct the chromatic aberration of each field of view.

[0113] Embodiment 3

[0114] Please refer to Figure 11 , which shows a schematic structural diagram of the optical lens 300 provided in Embodiment 3 of the present invention. Compared with Embodiment 1, the main differences are as follows: the third lens L3 has a positive optical power; the object side surface S7 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

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

[0116] Table 3-1

[0117]

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

[0119] Table 3-2

[0120]

[0121] In this embodiment, the field curvature curve graph, F-Theta distortion curve graph, axial aberration curve graph, and lateral chromatic aberration curve graph of the optical lens 300 are respectively as Figure 12 , Figure 13 , Figure 14 , Figure 15 shown.

[0122] It can be seen from Figure 12 that the field curvature of the meridional image plane and the sagittal image plane is controlled within -0.2 mm to 0.1 mm, indicating that the optical lens 300 can well correct the field curvature.

[0123] It can be seen from Figure 13 that the F-Theta distortion of the optical lens 300 is controlled within 0 to 0.4%, indicating that the distortion of the optical lens 300 is well corrected.

[0124] It can be seen from Figure 14 that the offset of the axial aberration is controlled within -0.05 mm to 0.1 mm, indicating that the optical lens 300 can better correct the axial aberration.

[0125] It can be seen from Figure 15It can be seen that the vertical chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can excellently correct the chromatic aberration of each field of view.

[0126] Please refer to Table 4 for the optical characteristics corresponding to the above embodiments, including the effective focal length f of the optical lens, the total optical length TTL, the aperture value Fno, the true image height IH corresponding to the maximum field of view angle, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view angle FOV, and the values corresponding to each conditional expression in each embodiment.

[0127] Table 4

[0128]

[0129] Combining the above embodiments, the optical lens provided by the present invention has at least the following advantages:

[0130] (1) Through specific surface shape settings and reasonable optical power distribution, the lens has an ultra-long focal length, can better present larger local details, make the picture more concentrated and compact, so as to meet the local shooting requirements; ensure large target surface imaging, and can match imaging chips with larger target surfaces to achieve high-definition imaging.

[0131] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens. The overall lens aberration is small, and it has the characteristics of small distortion and small chromatic aberration, improving the imaging quality of the optical lens.

[0132] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0133] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An optical lens, consisting of five lenses in total, characterized in that, It successively includes from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side is convex and whose image side is concave near the optical axis; A second lens with negative optical power, whose object side is concave and whose image side is concave; A third lens with optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fourth lens with positive optical power, whose image side is convex; A fifth lens with negative optical power, whose object side is concave and whose image side is concave; Wherein, the total optical length TTL of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 46 < 180°×TTL / IH / FOV < 51; the true image height IH corresponding to the maximum field of view angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1 < IH / EPD < 1.

05.

2. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 0.75 < TTL / f < 0.85; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 3.3 < TTL / IH < 3.

7.

3. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens, the true image height IH corresponding to the maximum field of view angle of the optical lens and the FOV of the maximum field of view angle of the optical lens satisfy: 1 < (IH / 2) / (f×Tan(FOV / 2)) < 1.02; the maximum field of view angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 2.8° < FOV / Fno < 2.9°.

4. The optical lens according to claim 1, wherein The true image height IH corresponding to the maximum field of view angle of the optical lens and the back focal length BFL of the optical lens satisfy: 0.8 < IH / BFL < 1.

5. The optical lens according to claim 1, wherein The clear aperture semi-diameter d1 of the object side of the first lens, the true image height IH corresponding to the maximum field of view angle of the optical lens and the maximum field of view angle FOV of the optical lens satisfy: 8.5 < d1 / (IH / 2) / tan(FOV / 2) < 8.8; the clear aperture semi-diameter d1 of the object side of the first lens and the clear aperture semi-diameter d10 of the image side of the fifth lens satisfy: 1.3 < d1 / d10 < 1.4; the effective focal length f of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 4.35 < f / IH < 4.

45.

6. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.35 < f1 / f < 0.5; the effective focal length f of the optical lens and the curvature radius R1 of the object side of the first lens satisfy: 0.15 < R1 / f < 0.25; the effective focal length f of the optical lens and the curvature radius R2 of the image side of the first lens satisfy: 1.8 < R2 / f < 2.

2.

7. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -0.55 < f2 / f < -0.25; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.3 < (R3 + R4) / (R3 - R4) < 0.

7.

8. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.35 < f4 / f < 0.45; the focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -13.5 < R8 / f4 < -0.

5.

9. The optical lens according to claim 1, wherein The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -0.5 < f5 / f < -0.25; the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -0.35 < R9 / f < -0.2; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.45 < R10 / f < 5.

10. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the curvature radius R7 of the object side surface of the fourth lens satisfy: 6.6 < f3 / R7 < 52.8; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R5 / f < 8.5; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: 0.15 < R6 / f < 3.

3.

11. The optical lens according to claim 1, wherein 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: -0.5 < R9 / R10 < 0; 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 < (R9 + R10) / (R9 - R10) < -0.3.

Images