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; a second lens with positive optical power, whose object side and image side are both convex; a third lens with negative optical power, whose object side is convex and whose image side is concave; a fourth lens with positive optical power, whose object side is concave and whose image side is convex; a fifth lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; wherein, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.3 < f12 / f < 1.5. The optical lens provided by the present invention has a small volume; it can achieve a large wide angle of the lens, ensuring the balance of the small head size and the large field of view angle of the lens; it can reasonably correct the overall aberration of the optical lens and has a small distortion.

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 rapid development of the electronics industry, the mobile phone and tablet产业链 is also being rapidly updated. The product requirements are getting higher and higher, with beautiful appearance and comprehensive integrated functions, making the manufacturing industry face increasingly severe challenges. The field of view of an ordinary camera is about 78°, and the distortion is relatively large. When a high-pixel chip is installed, the target surface is larger, resulting in a larger effective focal length and overall optical length of the optical lens, which is not conducive to the overall miniaturization of the lens. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an optical lens with one or more advantages such as a large wide angle, small distortion, short overall length, 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 successively includes from the object side to the imaging surface along the optical axis:

[0006] A first lens with a positive optical power, whose object side is convex and whose image side is concave;

[0007] A second lens with a positive optical power, whose object side and image side are both convex;

[0008] A third lens with a negative optical power, whose object side is convex and whose image side is concave;

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

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

[0011] Wherein, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.3 < f12 / f < 1.5.

[0012] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 8 < f1 / f < 16; 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: 0.8 < R1 / R2 < 1.

[0013] More preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.4 < f2 / f < 1.6; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 4 < f1 / f2 < 13.

[0014] More preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -40 < f3 / f < -28; 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: 0.02 < (R5 - R6) / (R5 + R6) < 0.08.

[0015] More preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 2.3; the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.1 < (R7 - R8) / (R7 + R8) < 0.2.

[0016] More preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -10 < f5 / f < -4; 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: 1.1 < R9 / R10 < 1.5.

[0017] More preferably, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -20 < f3 / f4 < -15.

[0018] More preferably, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.45 < f4 / f5 < -0.15.

[0019] More preferably, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.4 < BFL / f < 0.48; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.26 < BFL / TTL < 0.3.

[0020] More preferably, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 0.35 < CT3 / CT4 < 0.55; the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 1 < CT4 / CT5 < 1.3.

[0021] More preferably, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.995 < 2×f×tan(FOV / 2) / IH < 1.005.

[0022] Compared with the prior art, the optical lens provided by the present invention has a small volume and can also achieve a wide angle of the lens through a specific surface shape setting and reasonable optical focal length distribution, thereby ensuring the miniaturization of the head size of the lens and the balance of the wide field of view. In addition, the optical lens of the present invention can also reasonably correct the overall aberration of the optical lens, has a small distortion, makes the optical lens have a high pixel, and improves the imaging quality of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0025] Figure 2 It is a field curvature curve diagram of the optical lens in Example 1 of the present invention.

[0026] Figure 3 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 1 of the present invention.

[0027] Figure 4 Graph showing the vertical axis chromatic aberration of the optical lens in Example 1 of the present invention.

[0028] Figure 5 Graph showing the axial aberration of the optical lens in Example 1 of the present invention.

[0029] Figure 6 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0030] Figure 7 4 is a field curvature curve diagram of the optical lens in Example 2 of the present invention.

[0031] Figure 8 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 2 of the present invention.

[0032] Fig. 9 Graph showing the vertical axis chromatic aberration of the optical lens in Example 2 of the present invention.

[0033] Fig.10 Graph showing the axial aberration of the optical lens in Embodiment 2 of the present invention.

[0034] Fig.11 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0035] Fig.12 4 is a field curvature curve diagram of the optical lens in Example 3 of the present invention.

[0036] Fig.13 4 is a F-Tanθ distortion curve diagram of the optical lens in Example 3 of the present invention.

[0037] Fig.14 Graph showing the vertical axis chromatic aberration of the optical lens in Example 3 of the present invention.

[0038] Fig.15 Graph showing the axial aberration of the optical lens in Embodiment 3 of the present invention.

[0039] Fig.16 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0040] Fig.17 It is a field curvature curve diagram of the optical lens in Example 4 of the present invention.

[0041] Fig.18 4 is a F-Tanθ distortion curve of the optical lens in Example 4 of the present invention.

[0042] Fig.19 Graph showing the vertical axis chromatic aberration of the optical lens in Example 4 of the present invention.

[0043] Fig. 20 4 is an axial aberration curve diagram of the optical lens in Example 4 of the present invention.

[0044] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0045] In order to better understand the present application, a more detailed description will be made of various aspects of the present application 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 are not intended to 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.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0048] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0049] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The optical lens provided by the embodiment of the present invention is composed of five lenses, which are a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the imaging surface along the optical axis.

[0053] In some embodiments, the first lens may have positive power, with its object side surface being convex and its image side surface being concave. The second lens may have positive power, with both its object side surface and its image side surface being convex. The third lens may have negative power, with its object side surface being convex and its image side surface being concave. The fourth lens may have positive power, with its object side surface being concave and its image side surface being convex. The fifth lens may have negative power, with its object side surface being convex at the near optical axis and its image side surface being concave at the near optical axis.

[0054] In some embodiments, the optical lens may further include a diaphragm, which may be located between the first lens and the second lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image. At the same time, by setting the diaphragm between the first and second lenses, the light entering the optical system can be effectively converged, the aperture of the optical system can be reduced, and a large field of view angle of the lens can be better achieved.

[0055] 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.

[0056] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.3 < f12 / f < 1.5. By setting the first and second lenses to have a relatively large positive refractive power within the above range, the light entering the system can be effectively converged, the aperture of the optical system can be reduced, and the field of view angle of the lens can be increased, and a better balance between the miniaturization of the head size and the large field of view angle of the lens can be achieved.

[0057] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 8 < f1 / f < 16; 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: 0.8 < R1 / R2 < 1. By satisfying the above range, as much light as possible can be received into the system, which is beneficial to achieving a large field of view angle of the lens.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.4 < f2 / f < 1.6; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 4 < f1 / f2 < 13. By satisfying the above range, it is beneficial to further converge the incident light, reduce the correction difficulty of the marginal aberration and distortion, and enable the lens to have a small distortion while achieving a large field of view angle.

[0059] 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 < -28; 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: 0.02 < (R5 - R6) / (R5 + R6) < 0.08. By satisfying the above range, it is beneficial to correct the system aberration and improve the imaging quality.

[0060] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 2.3; the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.1 < (R7 - R8) / (R7 + R8) < 0.2. Satisfying the above ranges is beneficial to improving the light converging ability of the optical lens, and at the same time can balance the aberration of the optical lens and improve the imaging quality of the optical lens.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -10 < f5 / f < -4; 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: 1.1 < R9 / R10 < 1.5. Satisfying the above ranges enables the fifth lens to undertake a large light deflection ability, which is beneficial to balancing the aberration of the entire system; at the same time, it can increase the incident angle of light entering the image plane, realize large target surface imaging of the lens, and can better match a large-size chip to achieve high-pixel imaging of the lens.

[0062] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -20 < f3 / f4 < -15. Satisfying the above ranges is beneficial to the smooth transition of light, and at the same time corrects various aberrations of the optical lens and improves the imaging quality of the optical lens.

[0063] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.45 < f4 / f5 < -0.15. Satisfying the above ranges is beneficial to increasing the incident angle of light entering the image plane, further increasing the imaging area of the lens, and realizing large target surface imaging 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: 0.4 < BFL / f < 0.48; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.26 < BFL / TTL < 0.3. Satisfying the above ranges enables the optical lens to have a large optical back focal length, which is beneficial to avoiding assembly interference between the lens and the imaging chip.

[0065] In some embodiments, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 0.35 < CT3 / CT4 < 0.55; the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 1 < CT4 / CT5 < 1.3. Satisfying the above ranges, by reasonably setting the thickness relationship of the third, fourth, and fifth lenses, while the central thickness of each lens meets the requirements of assembly stability, the assembly deformation and ghost image reflection energy of the lens can be reduced, and the imaging quality can be improved.

[0066] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens, and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.995 < 2×f×tan(FOV / 2) / IH < 1.005. Meeting the above range can make the lens have less distortion, with the distortion value controlled within 1%, ensuring a very high image reduction degree of the lens and improving the overall imaging quality.

[0067] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 1.6. Meeting the above range is beneficial to realizing the miniaturization of the lens.

[0068] In some embodiments, the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.6 < TTL / IH < 0.65. Meeting the above range is beneficial to realizing the balance between the miniaturization of the optical lens and large target surface imaging.

[0069] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 1.1 < R7 / R8 < 1.5. The sag SAG41 of the object side surface of the fourth lens at the clear aperture and the sag SAG42 of the image side surface of the fourth lens at the clear aperture satisfy: 0.5 < SAG41 / SAG42 < 0.6. Meeting the above range, by reasonably setting the surface shape and sag of the fourth lens, is beneficial to increasing the incident angle of light and improving the relative illumination of the edge field of view at the same time.

[0070] In some embodiments, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the central thickness CT3 of the third lens satisfy: 0.9 < R5 / (R6 + CT3) < 1. Meeting the above range, by reasonably setting the relationship between the surface shape and thickness of the third lens, is beneficial to lens processing and improving the yield.

[0071] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the central thickness CT5 of the fifth lens satisfy: 0.8 < R9 / (R10 + CT5) < 0.9. Meeting the above range, by reasonably setting the relationship between the surface shape and thickness of the fifth lens, is beneficial to lens processing and improving the yield.

[0072] 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: 0.5 < f12 / f34 < 0.7. Meeting the above range, by reasonably setting the distribution of the optical power of each lens, can effectively eliminate the chromatic aberration and coma of the system and improve the resolution of the system.

[0073] In some embodiments, the effective focal length f of the optical lens and the combined focal length f34 of the third lens and the fourth lens satisfy: 1.8 < f34 / f < 2.5. Meeting the above range, by reasonably setting the combined focal length of the third and fourth lenses, it is beneficial to correct various aberrations of the system and improve the imaging quality.

[0074] In some embodiments, 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: 0.25 < DM11 / DM52 < 0.33. Meeting the above range, by reasonably controlling the aperture relationship of the first and last lenses, while ensuring that the lens has a large imaging surface, it has a small head size, and better realizes the miniaturization of the lens.

[0075] In some embodiments, the optical lens satisfies the conditional formula: 2.3 mm < f < 2.5 mm, 100° < FOV < 110°, 3.5 mm < TTL < 4 mm, 5.5 mm < IH < 6.5 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. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of a large wide angle, a short overall length, and a relatively large image surface.

[0076] In some embodiments, the lens material of 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 of lens miniaturization and high image quality.

[0077] 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, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0078] 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:

[0079] ;

[0080] Among them, 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 surface vertex, K is the quadratic surface coefficient, B, C, D, E, F, G, H, I, and J are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order, eighteenth-order, and twentieth-order surface coefficients respectively.

[0081] The present invention is further described below in multiple 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 table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate 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.

[0082] Example 1

[0083] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 100 provided in Embodiment 1 of the present invention, wherein the optical lens includes, in sequence from the object side to the imaging surface along the optical axis: a first lens L1, an aperture ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a filter G1.

[0084] The first lens L1 has positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave;

[0085] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex surfaces;

[0086] The third lens L3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0087] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex;

[0088] The fifth lens L5 has negative refractive power, an object-side surface S9 thereof is convex at the near optical axis, and an image-side surface S10 thereof is concave at the near optical axis;

[0089] The object side surface S11 and the image side surface S12 of the filter G1 are both planes;

[0090] The imaging surface S13 is a plane.

[0091] 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.

[0092] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0093] Table 1-1

[0094]

[0095] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0096] Table 1-2

[0097]

[0098] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 and Figure 5 shown.

[0099] Figure 2 The field curvature curve of Example 1 is shown, which indicates the degree of curvature of light on the meridional image plane and the sagittal image plane, with the horizontal axis indicating the offset (unit: mm) and the vertical axis indicating the 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 ±0.2 mm, indicating that the optical lens 100 can correct the field curvature well.

[0100] Figure 3 The F-Tanθ distortion curve of Example 1 is shown, which represents the F-Tanθ distortion at different image heights on the imaging surface, the horizontal axis represents the F-Tanθ distortion value (unit: %), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the F-Tanθ distortion of the optical lens 100 is controlled within ±1%, indicating that the distortion of the optical lens 100 is well corrected.

[0101] Figure 4 The vertical axis chromatic aberration curve of Example 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 axis chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the field angle (unit: °). It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 100 can extremely well correct the chromatic aberration of each field of view.

[0102] Figure 5The axial aberration curve of Example 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 offset of the axial aberration is controlled within ±0.05mm, indicating that the optical lens 100 can better correct the axial aberration.

[0103] Example 2

[0104] See also Figure 6 , shown is a schematic diagram of the structure of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0105] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0106] Table 2-1

[0107]

[0108] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0109] Table 2-2

[0110]

[0111] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Fig. 9 and Fig.10 shown.

[0112] from Figure 7 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.2 mm, indicating that the optical lens 200 can correct the field curvature well.

[0113] from Figure 8 It can be seen that the F-Tanθ distortion of the optical lens 200 is controlled within ±1%, indicating that the distortion of the optical lens 200 is well corrected.

[0114] from Fig. 9 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 200 can extremely well correct the chromatic aberration of each field of view.

[0115] from Fig.10It can be seen that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 200 can correct the axial aberration well.

[0116] Example 3

[0117] See also Fig.11 , shown is a schematic diagram of the structure of the optical lens 300 provided in Example 3 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0118] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0119] Table 3-1

[0120]

[0121] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0122] Table 3-2

[0123]

[0124] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 300 are respectively as follows: Fig.12 , Fig.13 , Fig.14 and Fig.15 shown.

[0125] from Fig.12 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.2mm, indicating that the optical lens 300 can correct the field curvature well.

[0126] from Fig.13 It can be seen that the F-Tanθ distortion of the optical lens 300 is controlled within ±1%, indicating that the distortion of the optical lens 300 is well corrected.

[0127] from Fig.14 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 300 can extremely well correct the chromatic aberration of each field of view.

[0128] from Fig.15 It can be seen that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 300 can correct the axial aberration well.

[0129] Example 4

[0130] See also Fig.16 , shown is a schematic diagram of the structure of an optical lens 400 provided in Example 4 of the present invention. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0131] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0132] Table 4-1

[0133]

[0134] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0135] Table 4-2

[0136]

[0137] In this embodiment, the field curvature curve, F-Tanθ distortion curve, vertical axis chromatic aberration curve, and axial aberration curve of the optical lens 400 are respectively as follows: Fig.17 , Fig.18 , Fig.19 and Fig. 20 shown.

[0138] from Fig.17 It can be seen that the field curvature of the meridian image plane and the sagittal image plane is controlled within ±0.2mm, indicating that the optical lens 400 can correct the field curvature well.

[0139] from Fig.18 It can be seen that the F-Tanθ distortion of the optical lens 400 is controlled within ±1%, indicating that the distortion of the optical lens 400 is well corrected.

[0140] from Fig.19 It can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2μm, indicating that the optical lens 400 can extremely well correct the chromatic aberration of each field of view.

[0141] from Fig. 20 It can be seen that the offset of the axial aberration is controlled within ±0.05 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0142] Please refer to Table 5, which shows 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 real image height IH corresponding to the maximum field of view angle, the chief ray incident angle CRA at the maximum image height, the maximum field of view angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.

[0143] Table 5

[0144]

[0145] In summary, the optical lens provided by the present invention has at least the following advantages:

[0146] (1) Through specific surface shape settings and reasonable optical focal length distribution, the lens can effectively limit the length of the lens, which is conducive to the miniaturization of the optical lens; it can also achieve a wide angle of the lens, ensuring the miniaturization of the lens head size and the balance of the wide field of view.

[0147] (2) The optical lens of the present invention can reasonably correct the overall aberration of the optical lens and has a small distortion (the distortion value is controlled within 1%), so that the optical lens has a high pixel and improves the imaging quality of the optical lens.

[0148] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0149] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, consisting of five lenses, 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; A second lens with positive optical power, whose object side and image side are both convex; A third lens with negative optical power, whose object side is convex and whose image side is concave; A fourth lens with positive optical power, whose object side is concave and whose image side is convex; A fifth lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; Wherein, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.3 < f12 / f < 1.5; the effective focal length f of the optical lens, the maximum field of view FOV of the optical lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.995 < 2×f×tan(FOV / 2) / IH < 1.

005.

2. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 8 < f1 / f < 16; 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: 0.8 < R1 / R2 < 1.

3. 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: 1.4 < f2 / f < 1.6; the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 4 < f1 / f2 < 13.

4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -40 < f3 / f < -28; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: 0.02 < (R5 - R6) / (R5 + R6) < 0.

08.

5. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 1.6 < f4 / f < 2.3; the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 0.1 < (R7 - R8) / (R7 + R8) < 0.

2.

6. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -10 < f5 / f < -4; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 1.1 < R9 / R10 < 1.

5.

7. The optical lens according to claim 1, characterized in that: The focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -20 < f3 / f4 < -15.

8. The optical lens according to claim 1, characterized in that: The focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -0.45 < f4 / f5 < -0.

15.

9. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.4 < BFL / f < 0.48; the back focal length BFL of the optical lens and the total optical length TTL of the optical lens satisfy: 0.26 < BFL / TTL < 0.

3.

10. The optical lens according to claim 1, characterized in that: The central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 0.35 < CT3 / CT4 < 0.55; the central thickness CT4 of the fourth lens and the central thickness CT5 of the fifth lens satisfy: 1 < CT4 / CT5 < 1.3.

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