Optical lens

Abstract

The application provides an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with positive focal power, the object side of which is a convex surface, and the image side of which is a convex surface near the optical axis; a second lens with negative focal power, the object side of which is a concave surface near the optical axis, and the image side of which is a convex surface near the optical axis; a third lens with positive focal power, the object side of which is a convex surface, and the image side of which is a concave surface; a fourth lens with positive focal power, the object side of which is a concave surface, and the image side of which is a convex surface; and a fifth lens with negative focal power, the object side of which is a convex surface near the optical axis, and the image side of which is a concave surface near the optical axis. The optical lens provided by the application has an ultrathin small head size and a small total length, ensures the miniaturization of the head size of the lens and the balance of a large field angle, can reasonably correct the overall aberration of the optical lens, and improves the imaging quality of the optical lens.

Description

Technical Field

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

[0002] With the popularization of smart phones, the mobile phone industry has developed vigorously. The public's various demands for mobile phones are also continuously increasing. The camera function of mobile phones has become an important factor for people to choose mobile phones. Consumers' requirements for mobile phone cameras are getting higher and higher. They not only require high-pixel imaging but also consider the use feel, reducing the body thickness and weight. Therefore, mobile phone manufacturers have put forward more new requirements for the lens groups installed on mobile phones. How to make mobile phones meet the requirements of high-pixel imaging while reducing the weight of the lens and making the optical system meet the requirements of miniaturization is an urgent problem to be solved at present. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an optical lens, which has one or more advantages such as an ultra-thin small head size, a small total length, a high pixel, and excellent imaging quality.

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

[0005] An optical lens is composed of five lenses, and sequentially includes from the object side to the imaging surface along the optical axis:

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

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

[0008] A third lens with a positive optical power, its object side is a convex surface, and its image side is a concave surface;

[0009] A fourth lens with a positive optical power, its object side is a concave surface, and its image side is a convex surface;

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

[0011] Among them, the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.02 < f23 / f45 < 0.15; the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm.

[0012] Further preferably, the effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 < TTL / f < 1.2; 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: 0.5 < TTL / IH < 0.54.

[0013] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.3 < f1 / f < 0.6; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -0.5 < R1 / R2 < -0.05.

[0014] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1 < f2 / f < -0.5; 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: 0.1 < R3 / R4 < 0.5.

[0015] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 40 < f3 / f < 70; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.9 < R5 / R6 < 1.1.

[0016] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 3 < f4 / f < 9; the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens and the central thickness CT4 of the fourth lens satisfy: 0.9 < R7 / (R8 - CT4) < 1.1.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6 < f5 / f < -2; 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 < 2.

[0018] Further preferably, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.02 < f2 / f3 < -0.01; the focal length f1 of the first lens and the focal length f3 of the third lens satisfy: 0 < f1 / f3 < 0.02.

[0019] Further preferably, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -0.2 < f1 / f5 < -0.1; the clear aperture radius DM11 of the object side surface of the first lens and the clear aperture radius DM52 of the image side surface of the fifth lens satisfy: 0.2 < DM11 / DM52 < 0.28.

[0020] Further preferably, the distance CT12 between the first lens and the second lens on the optical axis and the distance CT34 between the third lens and the fourth lens on the optical axis satisfy: 0.1 < CT12 / CT34 < 0.3; the distance CT12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens satisfy: 0.2 < CT12 / CT2 < 0.4.

[0021] Compared with the prior art, the optical lens provided by the present invention has an ultra-thin and small head size and a small total length through specific surface shape settings and reasonable optical power distribution; it can also achieve a large viewing angle of the lens, ensuring the balance between the miniaturization of the head size of the lens and the large viewing angle. In addition, the optical lens of the present invention can also reasonably correct the overall aberration of the optical lens, making the optical lens have high pixels and improving the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0024] Figure 2 is a graph of F-Tanθ distortion of the optical lens in Embodiment 1 of the present invention.

[0025] Figure 3 is a graph of lateral chromatic aberration of the optical lens in Embodiment 1 of the present invention.

[0026] Figure 4 is a graph of axial aberration of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 5 is a schematic structural diagram of the optical lens in Embodiment 2 of the present invention.

[0028] Figure 6 is a graph of F-Tanθ distortion of the optical lens in Embodiment 2 of the present invention.

[0029] Figure 7 is a graph of lateral chromatic aberration of the optical lens in Embodiment 2 of the present invention.

[0030] Figure 8 is a graph of axial aberration of the optical lens in Embodiment 2 of the present invention.

[0031] Figure 9 is a schematic structural diagram of the optical lens in Embodiment 3 of the present invention.

[0032] Figure 10This is the F-Tanθ distortion curve of the optical lens in Embodiment 3 of the present invention.

[0033] Figure 11 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0034] Figure 12 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0035] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0036] Figure 14 This is the F-Tanθ distortion curve of the optical lens in Embodiment 4 of the present invention.

[0037] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0038] Figure 16 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0039] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The optical lens provided in this embodiment of the invention consists of five lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

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

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

[0050] In some embodiments, the optical lens may further include a filter, which may be 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 combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.02 < f23 / f45 < 0.15. By satisfying the above range and reasonably setting the distribution of the optical power of each lens, the incident light can be diverged to a certain extent, which is beneficial to achieving large field of view and large target surface imaging of the lens.

[0052] In some embodiments, the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm. By satisfying the above range, the effective aperture of the first lens can be controlled within 1.1 mm, which is beneficial to achieving the characteristic of a small head of the lens, facilitating the improvement of the screen-to-body ratio of the electronic device carried, and meeting the market needs.

[0053] In some embodiments, the effective focal length f of the optical lens and the optical total length TTL of the optical lens satisfy: 1.1 < TTL / f < 1.2. By satisfying the above range, the length of the lens can be effectively limited, which is beneficial to achieving miniaturization of the optical lens.

[0054] In some embodiments, the optical total 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: 0.5 < TTL / IH < 0.54. By satisfying the above range and reasonably limiting the ratio of the optical total length to the image height of the optical lens, large target surface imaging can be achieved while shortening the optical total length, achieving the balance between miniaturization of the optical lens and large target surface imaging, and improving the market competitiveness.

[0055] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.3 < f1 / f < 0.6; the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: -0.5 < R1 / R2 < -0.05. By satisfying the above range and setting the first lens to have a relatively large positive refractive power, the light entering the first lens can be well converged into the optical system, which is beneficial to reducing the difficulty of aberration correction while achieving a large field of view and ensuring the imaging quality of the optical lens.

[0056] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1 < f2 / f < -0.5; 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: 0.1 < R3 / R4 < 0.5. By satisfying the above ranges and reasonably setting the focal length and surface shape of the second lens, the aberration caused by the first lens can be effectively corrected, and the imaging quality of the lens can be improved.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 40 < f3 / f < 70; the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0.9 < R5 / R6 < 1.1. By satisfying the above ranges and reasonably setting the focal length and surface shape of the third lens, the light can be effectively converged, the difficulty of correcting the marginal field distortion can be reduced, ensuring that the lens has a small distortion while achieving a large field angle, and improving the overall imaging quality.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 3 < f4 / f < 9; the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens and the central thickness CT4 of the fourth lens satisfy: 0.9 < R7 / (R8 - CT4) < 1.1. By satisfying the above ranges, the aberration of the marginal field can be effectively improved, and the overall imaging quality of the optical lens can be enhanced.

[0059] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6 < f5 / f < -2; the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 1 < R9 / R10 < 2. By satisfying the above ranges, the incident angle of the light entering the imaging surface can be increased, which is beneficial to achieving a large image surface of the lens.

[0060] In some embodiments, the focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.02 < f2 / f3 < -0.01; the focal length f1 of the first lens and the focal length f3 of the third lens satisfy: 0 < f1 / f3 < 0.02. By satisfying the above ranges and reasonably setting the focal length relationship of the first three lenses, the light entering the front end of the lens can be well converged into the optical system, achieving a large field of view while reducing the head size of the lens and realizing a small aperture of the lens.

[0061] In some embodiments, the focal length f1 of the first lens and the focal length f5 of the fifth lens satisfy: -0.2 < f1 / f5 < -0.1; the clear aperture radius DM11 of the object side of the first lens and the clear aperture radius DM52 of the image side of the fifth lens satisfy: 0.2 < DM11 / DM52 < 0.28. By reasonably setting the focal lengths and surface shape relationships of the first and last lenses in the lens, while ensuring that as much light as possible enters the system, the area of the light entering the imaging surface is increased, which is beneficial to achieving large image plane imaging of the lens. At the same time, it ensures that the lens has a small head size and realizes a small aperture of the lens.

[0062] In some embodiments, the distance CT12 between the first lens and the second lens on the optical axis and the distance CT34 between the third lens and the fourth lens on the optical axis satisfy: 0.1 < CT12 / CT34 < 0.3; the distance CT12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens satisfy: 0.2 < CT12 / CT2 < 0.4. By reasonably distributing the air gaps between the lenses, while meeting the requirements of assembly stability, the assembly deformation and assembly difficulty of the lenses can be reduced. At the same time, the structure of the lens is made more compact, which is beneficial to realizing miniaturization of the lens.

[0063] 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: 5.3 < IH / EPD < 5.6. Meeting the above range is beneficial to achieving the balance of a small head size and a large image plane of the lens.

[0064] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.3 < BFL / f < 0.4; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.25 < BFL / TTL < 0.32. Meeting the above range can make the lens have a large back focus, which is beneficial to the assembly of the module and avoids mechanical interference between the lens and the module.

[0065] In some embodiments, the object side curvature radius R7 of the fourth lens and the effective focal length f of the optical lens satisfy: -1 < R7 / f < -0.5; the image side curvature radius R8 of the fourth lens and the effective focal length f of the optical lens satisfy: -0.9 < R8 / f < -0.5. By reasonably defining the shapes of the object side and the image side of the fourth lens, it is beneficial to reducing the distortion generated by the front lens, correcting the spherical aberration of the optical lens, and improving the imaging quality of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.4 < R9 / f < 0.8; the effective focal length f of the optical lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.3 < R10 / f < 0.5. Satisfying the above ranges and reasonably defining the shapes of the object side surface and the image side surface of the fifth lens are beneficial to increasing the imaging area, achieving the high pixel characteristic, and improving the imaging quality of the optical lens.

[0067] In some embodiments, the effective focal length f of the optical lens and the combined focal length f23 of the second lens and the third lens satisfy: -1 < f23 / f < -0.5; the effective focal length f of the optical lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: -20 < f45 / f < -5. Satisfying the above ranges is beneficial to correcting various aberrations of the system and achieving a large field of view of the lens.

[0068] In some embodiments, the optical lens satisfies the conditional formula: 2.5 mm < f < 2.6 mm, 90° < FOV < 100°, 2.8 mm < TTL < 3 mm, 5 mm < IH < 6 mm, where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, TTL represents the overall optical length of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention at least has characteristics such as a large wide angle and a short overall length.

[0069] 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. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also enables the structure of the lens to be relatively compact, and can better achieve the balance between the miniaturization of the lens and the high image quality.

[0070] 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 achieving 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, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving the miniaturization of the lens.

[0071] 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:

[0072]

[0073] 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, H, I, and J are the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth, eighteenth, and twentieth order surface coefficients, respectively.

[0074] 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.

[0075] Example 1

[0076] Please see Figure 1 The diagram shown is a structural schematic of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens includes, along the optical axis from the object side to the imaging plane, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and filter G1.

[0077] Among them, the first lens L1 has positive optical power, its object side S1 is convex, and its image side S2 is convex near the optical axis.

[0078] The second lens L2 has negative optical power, its object side S3 is concave near the optical axis, and its image side S4 is convex near the optical axis.

[0079] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0080] The fourth lens L4 has positive optical power, its object side S7 is concave, and its image side S8 is convex.

[0081] The fifth lens L5 has negative optical power, its object side S9 is convex near the optical axis, and its image side S10 is concave near the optical axis.

[0082] The object-side surface S11 and the image-side surface S12 of the filter G1 are both planar.

[0083] The imaging plane S13 is a plane.

[0084] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all plastic aspherical lenses.

[0085] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0086] Table 1-1

[0087]

[0088]

[0089] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0090] Table 1-2

[0091] Face number K B C D E S1 -3.887E+01 4.353E+00 -2.950E+01 1.155E+02 -1.156E+02 S2 7.201E+01 1.750E+00 -1.705E+01 1.085E+02 -3.760E+02 S3 -1.006E+02 -8.545E-01 2.610E+01 -2.135E+02 7.151E+02 S4 4.137E+01 3.668E+00 -1.949E+01 3.489E+01 3.094E+02 S5 -3.654E+00 1.153E+00 -1.824E+01 9.966E+01 -2.313E+02 S6 -8.534E+01 1.042E+00 -4.991E+00 3.664E+00 2.850E+01 S7 -2.287E+01 -7.843E-02 6.752E-01 -2.748E+00 4.677E+00 S8 -7.199E+00 -1.159E-01 3.938E-01 -4.098E-02 -6.569E-01 S9 -4.551E+01 -2.011E-01 8.580E-02 -1.062E-02 -4.468E-04 S10 -1.131E+01 -1.397E-01 5.493E-02 -1.413E-02 1.457E-03 Face number F G H I J S1 -7.232E+02 1.291E+03 5.390E+03 -1.594E+04 8.811E+03 S2 1.832E+01 3.951E+03 -2.513E+03 -3.282E+04 5.241E+04 S3 2.465E+02 -2.562E+03 -3.272E+04 1.705E+05 -2.352E+05 S4 -1.043E+03 -3.782E+03 1.159E+04 5.938E+04 -1.777E+05 S5 -2.113E+02 3.535E+02 1.199E+04 -4.465E+04 4.307E+04 S6 -7.403E+01 1.687E+01 4.371E+01 1.799E+02 -2.762E+02 S7 -4.477E+00 2.820E+00 -8.633E-02 8.375E-01 -2.109E+00 S8 4.270E-01 1.663E-01 -1.122E-01 -1.359E-01 9.904E-02 S9 7.859E-05 2.076E-05 -1.289E-05 5.656E-06 -7.341E-07 S10 -3.872E-04 7.664E-05 2.925E-05 -6.818E-06 1.702E-07

[0092] In this embodiment, the F-Tanθ distortion curve, transverse chromatic aberration curve, and axial aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0093] Figure 2 The F-Tanθ distortion curves for Example 1 are shown, representing the F-Tanθ distortion at different image heights on the imaging plane. The horizontal axis represents the F-Tanθ distortion value (unit: %), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the F-Tanθ distortion of the optical lens 100 is controlled within ±2.5%, indicating that the distortion of the optical lens 100 is well corrected.

[0094] Figure 3 The diagram shows the transverse chromatic aberration curve of Example 1, which represents the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the field of view angle (unit: °). As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2 μm, indicating that the optical lens 100 can correct chromatic aberration in each field of view very well.

[0095] Figure 4 The axial aberration curve of Embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.06 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0096] Example 2

[0097] Please see Figure 5 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.

[0098] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0099] Table 2-1

[0100]

[0101] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0102] Table 2-2

[0103]

[0104]

[0105] In this embodiment, the F-Tanθ distortion curve, transverse chromatic aberration curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0106] from Figure 6 As can be seen, the F-Tanθ distortion of optical lens 200 is controlled within ±2.5%, indicating that the distortion of optical lens 200 has been well corrected.

[0107] from Figure 7 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 200 can correct the chromatic aberration of each field of view very well.

[0108] from Figure 8 As can be seen, the axial aberration offset is controlled within ±0.06mm, indicating that the optical lens 200 can correct axial aberration well.

[0109] Example 3

[0110] Please see Figure 9 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.

[0111] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0112] Table 3-1

[0113]

[0114]

[0115] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0116] Table 3-2

[0117] Face number K B C D E S1 -4.822E+01 4.140E+00 -2.967E+01 1.196E+02 -1.415E+02 S2 -7.617E+01 1.867E+00 -1.684E+01 1.149E+02 -3.822E+02 S3 -9.603E+01 -1.589E-01 2.424E+01 -2.125E+02 7.497E+02 S4 -1.001E+02 4.202E+00 -2.372E+01 3.760E+01 3.396E+02 S5 2.367E+01 1.971E+00 -2.361E+01 1.200E+02 -2.405E+02 S6 -1.006E+02 4.833E-01 -2.976E+00 2.836E+00 2.648E+01 S7 -1.006E+02 -6.524E-02 6.423E-01 -3.016E+00 4.341E+00 S8 -2.094E+01 3.217E-02 9.360E-02 -1.386E-01 -5.126E-01 S9 -2.090E+01 -2.608E-01 1.176E-01 -1.361E-02 -1.345E-03 S10 -8.035E+00 -1.757E-01 6.911E-02 -1.594E-02 9.657E-04 Face number F G H I J S1 -6.869E+02 1.666E+03 5.072E+03 -2.263E+04 2.340E+04 S2 -1.216E+02 3.920E+03 -1.000E+03 -4.046E+04 7.338E+04 S3 1.789E+02 -3.337E+03 -3.352E+04 1.858E+05 -2.550E+05 S4 -9.998E+02 -4.002E+03 9.738E+03 5.443E+04 -1.433E+05 S5 -2.213E+02 1.885E+02 1.153E+04 -4.435E+04 5.127E+04 S6 -7.453E+01 1.909E+01 4.798E+01 1.829E+02 -2.820E+02 S7 -4.639E+00 2.886E+00 1.520E-01 1.183E+00 -1.668E+00 S8 5.456E-01 1.773E-01 -1.651E-01 -1.834E-01 1.079E-01 S9 4.031E-05 4.473E-05 -4.828E-06 7.567E-06 -1.471E-06 S10 -3.536E-04 1.046E-04 3.399E-05 -7.024E-06 -1.531E-07

[0118] In this embodiment, the field curvature curve, F-Tanθ distortion curve, transverse chromatic aberration curve, and axial aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.

[0119] from Figure 10 As can be seen, the F-Tanθ distortion of optical lens 300 is controlled within ±2.5%, indicating that the distortion of optical lens 300 has been well corrected.

[0120] from Figure 11 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 300 can correct the chromatic aberration of each field of view very well.

[0121] from Figure 12 As can be seen, the axial aberration offset is controlled within ±0.06mm, indicating that the optical lens 300 can correct axial aberration well.

[0122] Example 4

[0123] Please see Figure 13 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0124] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0125] Table 4-1

[0126]

[0127] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0128] Table 4-2

[0129]

[0130]

[0131] In this embodiment, the F-Tanθ distortion curve, transverse chromatic aberration curve, and axial aberration curve of the optical lens 400 are respectively as follows: Figure 14 , Figure 15 , Figure 16 As shown.

[0132] from Figure 14 As can be seen, the F-Tanθ distortion of optical lens 400 is controlled within ±2.5%, indicating that the distortion of optical lens 400 has been well corrected.

[0133] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 400 can correct the chromatic aberration of each field of view very well.

[0134] from Figure 16 As can be seen, the axial aberration offset is controlled within ±0.06mm, indicating that the optical lens 400 can correct axial aberration well.

[0135] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0136] Table 5

[0137]

[0138]

[0139] In summary, the optical lens provided by the present invention has at least the following advantages:

[0140] (1) By setting specific surface shapes and reasonable optical power distribution, the lens can effectively limit the length of the lens, so that the lens has an ultra-thin head size and a small total length; it can also achieve a large field of view of the lens, ensuring the miniaturization of the head size of the lens and the balance of the large field of view.

[0141] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens, so that the optical lens has high pixel count and improves the imaging quality of the optical lens.

[0142] 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.

[0143] 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 consisting of five pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, comprises successively: a first lens with positive refractive power, the object side of which is convex, and the image side of which is convex near the optical axis; a second lens with negative refractive power, the object side of which is concave near the optical axis, and the image side of which is convex near the optical axis; a third lens with positive refractive power, the object side of which is convex, and the image side of which is concave; a fourth lens with positive refractive power, the object side of which is concave, and the image side of which is convex; a fifth lens with negative refractive power, the object side of which is convex near the optical axis, and the image side of which is concave near the optical axis; wherein the combined focal length f23 of the second lens and the third lens and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 0.02 < f23 / f45 < 0.15; the maximum optical aperture SD1 of the first lens satisfies: 0.95 mm < SD1 < 1.1 mm.

2. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the total optical length TTL of the optical lens satisfy: 1.1 < TTL / f < 1.2; 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: 0.5 < TTL / IH < 0.

54.

3. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0.3 < f1 / f < 0.6; the object side curvature radius R1 of the first lens and the image side curvature radius R2 of the first lens satisfy: -0.5 < R1 / R2 < -0.

05.

4. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -1 < f2 / f < -0.5; the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens satisfy: 0.1 < R3 / R4 < 0.

5.

5. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 40 < f3 / f < 70; the object side curvature radius R5 of the third lens and the image side curvature radius R6 of the third lens satisfy: 0.9 < R5 / R6 < 1.

1.

6. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 3 < f4 / f < 9; the object side curvature radius R7 of the fourth lens, the image side curvature radius R8 of the fourth lens, and the central thickness CT4 of the fourth lens satisfy: 0.9 < R7 / (R8-CT4) < 1.

1.

7. The optical lens of claim 1, wherein, The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -6 < f5 / f < -2; 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 < 2.

8. The optical lens of claim 1, wherein, The focal length f2 of the second lens and the focal length f3 of the third lens satisfy: -0.02 < f2 / f3 < -0.01; the focal length f1 of the first lens and the focal length f3 of the third lens satisfy: 0 < f1 / f3 < 0.

02.

9. The optical lens of claim 1, wherein, A focal length f1 of the first lens and a focal length f5 of the fifth lens satisfy: -0.2 < f1 / f5 < -0.1; and an object-side half-field diameter DM11 of the first lens and an image-side half-field diameter DM52 of the fifth lens satisfy: 0.2 < DM11 / DM52 < 0.

28.

10. The optical lens of claim 1, wherein, A distance CT12 of the first lens and the second lens on the optical axis and a distance CT34 of the third lens and the fourth lens on the optical axis satisfy: 0.1 < CT12 / CT34 < 0.3; and the distance CT12 of the first lens and the second lens on the optical axis and a central thickness CT2 of the second lens satisfy: 0.2 < CT12 / CT2 < 0.4.

Images