Optical lens

Abstract

The invention provides an optical lens, which comprises six lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power; the second lens has positive focal power; the third lens has positive focal power; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface and the image side surface of the fifth lens is a concave surface or the object side surface of the fifth lens is a concave surface and the image side surface of the fifth lens is a convex surface; and the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface. According to the optical lens provided by the invention, by optimizing the shape, focal power, thickness, spacing and the like of each lens, the imaging quality of the optical lens is improved, the aberration is reduced, the imaging quality of the optical lens is improved, and the optical lens has one or more advantages of small aperture, large image plane, miniaturization, long focal length and the like.

Description

Technical Field

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

[0002] In recent years, with the rapid development of automobile assisted driving technology, optical lenses have been used more and more widely in automobiles.

[0003] At present, due to safety and other considerations, higher requirements are placed on the performance and structure of automotive optical lenses. For example, due to the iteration of the requirements for lens placement, the installation locations of lenses are limited, and the demand for miniaturization of lenses is becoming increasingly intense. At the same time, the demand for large image planes and small apertures is also increasing. In order to achieve higher pixel requirements and improve resolution capabilities, seven, eight or even more lens structures are usually selected, but this will seriously affect the miniaturization of lenses.

[0004] Therefore, how to make the optical lens achieve the characteristics of large imaging size, small aperture and long focal length to meet the performance requirements of vehicle-mounted applications is the goal pursued by lenses in this field. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide an optical lens having one or more advantages such as small aperture, large image surface, miniaturization, and telephoto characteristics.

[0006] The present invention provides an optical lens, which comprises six lenses in total, and which includes the following lenses in order from the object side to the imaging surface along the optical axis:

[0007] a first lens having negative optical power;

[0008] a second lens having positive optical power;

[0009] a third lens having positive refractive power;

[0010] a fourth lens element having positive refractive power and a convex object-side surface;

[0011] a fifth lens having negative optical power, wherein the object side surface is convex and the image side surface is concave or the object side surface is concave and the image side surface is convex;

[0012] The sixth lens element has negative optical power and its object-side surface is concave and its image-side surface is convex.

[0013] Further preferably, the effective focal length f of the optical lens and the total optical length TTL satisfy: 1.6 <TTL / f<2.5。

[0014] Further preferably, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.95<(IH / 2) / (f×Tan(FOV / 2))<1.05.

[0015] Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55 <IH / f<0.7。

[0016] Further preferably, the effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 <BFL / f<0.5。

[0017] Further preferably, the real image height IH, the total optical length TTL and the maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy: 55.0<180°×TTL / IH / FOV<80.0.

[0018] Further preferably, the sum ΣCT of the center thickness of each lens from the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy: 0.5<ΣCT / TTL<0.75.

[0019] Further preferably, the maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view and the object side aperture D1 of the first lens meet the following conditions: 3.0 <D1 / IH / tan(FOV / 2)<4.0。

[0020] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.7 <f1 / f<-0.8。

[0021] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9 <f2 / f。

[0022] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8 <f3 / f<1.8。

[0023] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.6 <f4 / f<1.3。

[0024] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.9 <f5 / f<-0.5。

[0025] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f<-0.6.

[0026] Further preferably, the effective focal length f of the optical lens and the object side curvature radius R7 of the fourth lens satisfy: 0.45 <R7 / f<0.95。

[0027] Further preferably, a curvature radius R9 of the object side surface and a curvature radius R10 of the image side surface of the fifth lens satisfy: 0.5<|(R9-R10) / (R9+R10)|<0.9.

[0028] Further preferably, a curvature radius R11 of the object side surface and a curvature radius R12 of the image side surface of the sixth lens satisfy: -0.7<(R11-R12) / (R11+R12)<-0.1.

[0029] The optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens by optimizing the shape, optical focal length, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, and telephoto characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 Schematic diagram of the structure of the optical lens in Example 1 of the present invention.

[0032] Figure 2 This is the MTF curve diagram of the optical lens in Example 1 of the present invention.

[0033] Figure 3 Schematic diagram of the structure of the optical lens in Example 2 of the present invention.

[0034] Figure 4 This is an MTF curve diagram of the optical lens in Example 2 of the present invention.

[0035] Figure 5 Schematic diagram of the structure of the optical lens in Example 3 of the present invention.

[0036] Figure 6 This is the MTF curve diagram of the optical lens in Example 3 of the present invention.

[0037] Figure 7 Schematic diagram of the structure of the optical lens in Example 4 of the present invention.

[0038] Figure 8 This is the MTF curve diagram of the optical lens in Example 4 of the present invention.

[0039] Fig. 9 Schematic diagram of the structure of the optical lens in Example 5 of the present invention.

[0040] Fig.10 This is the MTF curve diagram of the optical lens in Example 5 of the present invention.

[0041] Fig.11 Schematic diagram of the structure of the optical lens in Example 6 of the present invention.

[0042] Fig.12 This is the MTF curve diagram of the optical lens in Example 6 of the present invention.

[0043] Fig.13 Schematic diagram of the structure of the optical lens in Example 7 of the present invention.

[0044] Fig.14 This is the MTF curve diagram of the optical lens in Example 7 of the present invention.

[0045] Fig.15 Schematic diagram of the structure of the optical lens in Example 8 of the present invention.

[0046] Fig.16 This is the MTF curve diagram of the optical lens in Example 8 of the present invention.

[0047] Fig.17 Schematic diagram of the structure of the optical lens in Example 9 of the present invention.

[0048] Fig.18 This is an MTF curve diagram of the optical lens in Example 9 of the present invention.

[0049] Fig.19 Schematic diagram of the structure of the optical lens in Example 10 of the present invention.

[0050] Fig. 20 This is an MTF curve diagram of the optical lens in Example 10 of the present invention.

[0051] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The optical lens provided by the embodiment of the present invention comprises six lenses in total, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the imaging surface along the optical axis.

[0060] In some embodiments, the first lens has negative optical power, which is conducive to diverging light. Under the same field of view angle, the light emitted from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface and reduce the front port diameter.

[0061] In some embodiments, the second lens has positive optical power, which is beneficial for converging light. When used with the first lens having negative optical power, the overall length of the optical lens can be reduced, and the converging effect on light can further reduce the rear port diameter.

[0062] In some embodiments, the third lens has positive optical power, which is beneficial for receiving the light converged from the second lens, reducing the height of the light beam when it is incident on the object side of the fourth lens, and reducing the diameter of the object side of the fourth lens.

[0063] In some embodiments, the fourth lens has positive focal length, which is conducive to focusing light. When used with the fifth lens, it can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize optical properties such as distortion. The object side of the fourth lens is a convex surface, which can compress the light so that it can smoothly enter the fifth lens, reduce the sensitivity of the optical lens, and make the light turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0064] In some embodiments, the fifth lens has a negative focal length, which is conducive to diverging light, so that the subsequent optical system has a larger light receiving surface, and improving the optical performance can effectively correct various aberrations caused by the front lens, and improve the imaging quality of the optical lens. The object side of the fifth lens is convex, and the image side is concave, or the object side is concave and the image side is convex. The fifth lens is in a meniscus shape. With temperature changes, the difference between the two surfaces is small, which is conducive to achieving better thermal stability at high temperatures.

[0065] In some embodiments, the sixth lens has a negative focal length, which is conducive to diverging light, making the peripheral light and the central light turn upward to reach a higher imaging position, thereby increasing the imaging area of ​​the optical lens. The object side of the sixth lens is a concave surface, and the image side is a convex surface, which can make the light rise, so that the peripheral light can reach a higher imaging position, which is conducive to increasing the imaging area; at the same time, it can make the divergent light converge to the rear imaging surface, shorten the optical path of the edge field light to the imaging surface, and make the large-angle light deflect toward the optical axis after being emitted, which is conducive to reducing the lens aperture.

[0066] In some embodiments, the optical lens may further include an aperture, which may be located between the first lens and the second lens. It is understandable that the aperture is used to limit the amount of light entering to change the brightness of the image. When the aperture is located between the first lens and the second lens, it is beneficial to effectively converge the light entering the optical lens, reduce the lens aperture at the rear end of the optical system, and reduce the sensitivity of the optical lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be set at other positions according to actual needs.

[0067] In some embodiments, the optical lens may further include a filter and / or a protective glass disposed between the sixth lens and the imaging surface, which can filter light with different wavelengths and prevent damage to the image-side components (e.g., chips) of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the overall optical length TTL satisfy: 1.6 < TTL / f < 2.5. Meeting the above range indicates that the optical length of the optical lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the true image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f×Tan(FOV / 2)) < 1.05. Meeting the above range indicates that the optical distortion of the optical lens can be controlled within a small range, which is beneficial to improving the imaging quality of the optical lens.

[0070] 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 satisfy: 0.55 < IH / f < 0.7. Meeting the above range indicates that the optical lens can obtain a larger imaging surface, which is beneficial to improving the imaging quality of the optical lens.

[0071] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL satisfy: 0.2 < BFL / f < 0.5. Meeting the above range indicates that the optical lens has a longer back focal length, which is beneficial to reducing interference and facilitating the assembly of the module, and improving the production yield.

[0072] In some embodiments, the true image height IH corresponding to the maximum field of view of the optical lens, the overall optical length TTL, and the maximum field of view FOV satisfy: 55.0 < 180°×TTL / IH / FOV < 80.0. Meeting the above range can achieve a balance among large image height, long focal length, and miniaturization, and improve the imaging quality of the optical lens.

[0073] In some embodiments, the sum ∑CT of the central thicknesses of the lenses from the first lens to the sixth lens and the overall optical length TTL of the optical lens satisfy: 0.5 < ∑CT / TTL < 0.75. Meeting the above range is beneficial to compressing the overall length and volume of the optical lens and maintaining the miniaturization of the optical lens.

[0074] In some embodiments, the maximum field of view FOV of the optical lens, the true image height IH corresponding to the maximum field of view, and the clear aperture D1 of the object side surface of the first lens satisfy: 3.0 < D1 / IH / tan(FOV / 2) < 4.0. Meeting the above range can ensure a balance among the front aperture size, the field of view, and the image plane of the optical lens, and improve the imaging quality of the optical lens.

[0075] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.7 < f1 / f < -0.8. Meeting the above range is beneficial for diverging light. Under the condition of the same field of view angle, the light rays exiting from the image side of the first lens can enable the subsequent optical system to have a larger light receiving surface and reduce the front aperture.

[0076] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.9 < f2 / f. Meeting the above range is beneficial for converging light. When paired with the first lens having a negative optical power, it can reduce the total length of the optical lens, and the converging effect on light can further reduce the rear aperture.

[0077] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 0.8 < f3 / f < 1.8. Meeting the above range is beneficial for receiving the light converged by the second lens, reducing the height of the light beam when it is incident on the object side of the fourth lens, and reducing the aperture of the object side of the fourth lens.

[0078] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.6 < f4 / f < 1.3. Meeting the above range is beneficial for converging light. When paired with the fifth lens, it can effectively correct the aberration of the optical lens, improve the imaging quality, and optimize optical performances such as distortion.

[0079] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.9 < f5 / f < -0.5. Meeting the above range is beneficial for diverging light, enabling the subsequent optical system to have a larger light receiving surface, and improving the optical performance can effectively correct various aberrations brought by the front lenses and improve the imaging quality of the optical lens.

[0080] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f < -0.6. Meeting the above range is beneficial for diverging light, causing the peripheral light rays and the central light rays to turn upwards, reaching a higher imaging position, and increasing the imaging area of the optical lens.

[0081] In some embodiments, the effective focal length f of the optical lens and the curvature radius R7 of the object side of the fourth lens satisfy: 0.45 < R7 / f < 0.95. Meeting the above range can compress the light rays, enabling them to be incident on the fifth lens smoothly and steadily, reducing the sensitivity of the optical lens, and also enabling the light rays to turn faster to reach the image plane, thereby reducing the total length of the optical lens.

[0082] In some embodiments, the object side surface curvature radius R9 and the image side surface curvature radius R10 of the fifth lens satisfy: 0.5<|(R9-R10) / (R9+R10)|<0.9. When the above range is met, the difference between the two surfaces changes with temperature, which is conducive to achieving better thermal stability at high temperatures; at the same time, it can optimize the field curvature and improve the imaging quality of the optical lens.

[0083] In some embodiments, the object side curvature radius R11 and the image side curvature radius R12 of the sixth lens satisfy: -0.7<(R11-R12) / (R11+R12)<-0.1. Meeting the above range can make the light rise, so that the peripheral light can reach a higher imaging position, which is beneficial to increase the imaging area; at the same time, it can make the divergent light converge to the rear imaging surface, shorten the optical path of the edge field light to the imaging surface, and make the large-angle light deflect toward the optical axis after being emitted, which is beneficial to reduce the lens aperture.

[0084] In some embodiments, the fourth lens and the fifth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of the processing technology of the optical lens and improving the assembly yield of the optical lens.

[0085] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens may be 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 lenses.

[0086] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0087]

[0088] 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, A, B, C, D, E, and F are the second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients respectively.

[0089] 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.

[0090] Example 1

[0091] See also Figure 1 , which is a schematic diagram of the structure of the optical lens 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, a sixth lens L6 and a filter G1.

[0092] Among them, the first lens L1 has negative optical power, its object side surface S1 is concave, and the image side surface S2 is convex; the second lens L2 has positive optical power, its object side surface S3 is concave, and the image side surface S4 is convex; the third lens L3 has positive optical power, and its object side surface S5 and image side surface S6 are both convex; the fourth lens L4 has positive optical power, its object side surface S7 is convex, and the image side surface S8 is concave; the fifth lens L5 has negative optical power, its object side surface S8 is convex, and the image side surface S9 is concave, and the fourth lens L4 and the fifth lens L5 form a cemented lens, and the cemented surface is S8; the sixth lens L6 has negative optical power, its object side surface S10 is concave, and the image side surface S11 is convex; the object side surface S12 and the image side surface S13 of the filter G1 are both planes; the imaging surface S14 is a plane.

[0093] The first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5 are glass spherical lenses; the second lens L2 and the sixth lens L6 are glass aspherical lenses.

[0094] The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

[0095] Table 1-1

[0096]

[0097] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0098] Table 1-2

[0099] Face number K A B C D E F S3 4.05E+01 0.00E+00 0.00E+00 3.56E-06 1.04E-08 3.10E-10 -9.54E-12 S4 -5.01E+01 0.00E+00 0.00E+00 6.35E-06 -6.68E-08 2.56E-09 -2.66E-11 S10 -1.32E+00 0.00E+00 5.03E-03 -4.77E-05 -5.00E-06 2.21E-07 -3.18E-09 S11 -1.71E+00 0.00E+00 4.64E-03 2.94E-05 -5.45E-06 2.06E-07 -3.26E-09

[0100] In this embodiment, Figure 2The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of this embodiment is above 0.2 in the entire field of view, and in the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution ability in both low-frequency and high-frequency conditions.

[0101] Example 2

[0102] See also Figure 3 , which is a schematic diagram of the structure of the optical lens provided in Example 2 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0103] The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

[0104] Table 2-1

[0105]

[0106] The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

[0107] Table 2-2

[0108] Face number K A B C D E F S3 -1.34E+00 0.00E+00 0.00E+00 -4.05E-06 3.08E-07 -9.54E-09 1.14E-10 S4 -4.94E+00 0.00E+00 0.00E+00 -4.73E-07 6.08E-08 -1.35E-09 1.27E-11 S10 7.15E+00 0.00E+00 -3.03E-04 -3.40E-05 6.48E-06 -2.71E-07 3.95E-09 S11 8.00E+01 0.00E+00 2.54E-04 -4.45E-05 7.68E-06 -3.05E-07 4.73E-09

[0109] from Figure 4 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in both low-frequency and high-frequency conditions.

[0110] Example 3

[0111] See also Figure 5 , shown is a schematic diagram of the structure of the optical lens provided in Example 3 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0112] The relevant parameters of each lens in the optical lens in Example 3 are shown in Table 3-1.

[0113] Table 3-1

[0114]

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

[0116] Table 3-2

[0117] Face number K A B C D E F S3 -3.52E+00 0.00E+00 0.00E+00 -5.72E-06 2.59E-07 -7.61E-09 7.83E-11 S4 1.43E+01 0.00E+00 0.00E+00 -1.40E-06 2.54E-08 -6.60E-10 5.32E-12 S10 -2.12E+00 0.00E+00 2.60E-03 -9.93E-05 5.37E-06 -2.56E-07 4.83E-09 S11 -3.87E+00 0.00E+00 2.98E-03 -7.50E-05 6.07E-06 -3.08E-07 5.81E-09

[0118] from Figure 6 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in both low-frequency and high-frequency conditions.

[0119] Example 4

[0120] See also Figure 7 , which is a schematic diagram of the structure of the optical lens provided in Example 4 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0121] The relevant parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0122] Table 4-1

[0123]

[0124]

[0125] The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

[0126] Table 4-2

[0127] Face number K A B C D E F S3 -3.39E+00 0.00E+00 0.00E+00 -5.79E-06 2.48E-07 -7.42E-09 7.54E-11 S4 1.69E+01 0.00E+00 0.00E+00 -1.43E-06 2.56E-08 -7.33E-10 6.07E-12 S10 -5.67E-01 0.00E+00 1.65E-03 -5.02E-05 6.62E-06 -3.40E-07 5.78E-09 S11 -4.84E+00 0.00E+00 1.67E-03 -5.18E-05 7.47E-06 -3.44E-07 5.46E-09

[0128] from Figure 8 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in both low-frequency and high-frequency conditions.

[0129] Example 5

[0130] See also Fig. 9 , which is a schematic diagram of the structure of the optical lens provided in Example 5 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0131] The relevant parameters of each lens in the optical lens in Example 5 are shown in Table 5-1.

[0132] Table 5-1

[0133]

[0134]

[0135] The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

[0136] Table 5-2

[0137] Face number K A B C D E F S3 -5.65E+00 0.00E+00 0.00E+00 -6.04E-06 2.06E-07 -6.10E-09 5.63E-11 S4 1.16E+01 0.00E+00 0.00E+00 -1.19E-06 1.20E-08 -2.76E-10 2.67E-12 S10 -9.52E-01 0.00E+00 2.54E-03 -7.01E-05 4.35E-06 -2.05E-07 3.50E-09 S11 -2.02E+00 0.00E+00 2.86E-03 -7.52E-05 6.42E-06 -2.84E-07 4.62E-09

[0138] from Fig.10 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0139] Example 6

[0140] See also Fig.11 , which is a schematic diagram of the structure of the optical lens provided in Example 6 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0141] The relevant parameters of each lens in the optical lens in Example 6 are shown in Table 6-1.

[0142] Table 6-1

[0143]

[0144] The surface parameters of the aspherical lens of the optical lens in Example 6 are shown in Table 6-2.

[0145] Table 6-2

[0146] Face number K A B C D E F S3 -2.71E+00 0.00E+00 0.00E+00 -4.33E-06 2.99E-07 -9.44E-09 1.14E-10 S4 -4.91E+00 0.00E+00 0.00E+00 -7.98E-07 5.55E-08 -1.32E-09 1.22E-11 S10 6.29E+00 0.00E+00 -9.97E-04 -2.36E-05 6.99E-06 -2.73E-07 3.61E-09 S11 8.00E+01 0.00E+00 -3.63E-04 -3.67E-05 8.24E-06 -3.05E-07 4.45E-09

[0147] from Fig.12 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in both low-frequency and high-frequency conditions.

[0148] Example 7

[0149] See also Fig.13, shown is a schematic diagram of the structure of the optical lens provided in Example 7 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0150] The relevant parameters of each lens in the optical lens in Example 7 are shown in Table 7-1.

[0151] Table 7-1

[0152]

[0153] The surface parameters of the aspherical lens of the optical lens in Example 7 are shown in Table 7-2.

[0154] Table 7-2

[0155] Face number K A B C D E F S3 -1.92E+00 0.00E+00 0.00E+00 -7.91E-06 -3.05E-07 2.28E-09 -2.69E-11 S4 -5.71E-01 0.00E+00 0.00E+00 -1.14E-05 -9.69E-08 -1.42E-09 1.29E-10 S10 -1.71E+00 0.00E+00 3.36E-03 -2.24E-05 -3.88E-06 1.19E-07 -9.45E-10 S11 -2.86E+00 0.00E+00 3.99E-03 2.94E-06 -1.79E-06 1.45E-08 6.06E-10

[0156] from Fig.14 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0157] Example 8

[0158] See also Fig.15 , which is a schematic diagram of the structure of the optical lens provided in Example 8 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0159] The relevant parameters of each lens in the optical lens in Example 8 are shown in Table 8-1.

[0160] Table 8-1

[0161]

[0162] The surface parameters of the aspherical lens of the optical lens in Example 8 are shown in Table 8-2.

[0163] Table 8-2

[0164] Face number K A B C D E F S3 -4.71E+00 0.00E+00 0.00E+00 -5.54E-06 6.30E-08 -2.00E-09 -1.97E-12 S4 4.65E+01 0.00E+00 0.00E+00 -1.80E-06 -5.16E-08 8.27E-10 -4.62E-12 S10 6.13E+00 0.00E+00 -1.84E-03 -2.50E-05 3.29E-06 8.24E-08 -4.11E-09 S11 5.06E+01 0.00E+00 -1.26E-03 -6.83E-06 3.53E-06 -3.61E-08 1.14E-10

[0165] from Fig.16 It can be seen that the MTF value of this embodiment is above 0.3 in the whole field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0166] Example 9

[0167] See also Fig.17 , shown is a schematic diagram of the structure of the optical lens provided in Example 9 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0168] The relevant parameters of each lens in the optical lens in Example 9 are shown in Table 9-1.

[0169] Table 9-1

[0170]

[0171] The surface parameters of the aspherical lens of the optical lens in Example 9 are shown in Table 9-2.

[0172] Table 9-2

[0173] Face number K A B C D E F S3 -5.47E+00 0.00E+00 0.00E+00 -6.90E-06 5.70E-08 -1.45E-09 -1.90E-11 S4 2.33E+01 0.00E+00 0.00E+00 -2.71E-06 -8.40E-08 1.48E-09 -8.95E-12 S10 2.79E+01 0.00E+00 -1.07E-03 9.51E-06 -2.73E-06 4.03E-08 4.63E-09 S11 8.02E+01 0.00E+00 -3.26E-04 -2.02E-05 1.22E-06 -8.06E-08 3.60E-09

[0174] from Fig.18 It can be seen that the MTF value of this embodiment is above 0.2 in the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has qualified imaging quality and qualified detail resolution capability in both low-frequency and high-frequency conditions.

[0175] Example 10

[0176] See also Fig.19 , which is a schematic diagram of the structure of the optical lens provided in Example 10 of the present invention. Compared with Example 1, this embodiment is different mainly in optical parameters such as the curvature radius of each lens surface and the lens thickness.

[0177] The relevant parameters of each lens in the optical lens in Example 10 are shown in Table 10-1.

[0178] Table 10-1

[0179]

[0180]

[0181] The surface parameters of the aspherical lens of the optical lens in Example 10 are shown in Table 10-2.

[0182] Table 10-2

[0183] Face number K A B C D E F S3 1.92E-01 0.00E+00 -4.44E-05 8.60E-07 -6.58E-08 3.09E-09 -4.58E-11 S4 6.84E+01 0.00E+00 3.30E-05 -2.97E-08 1.63E-08 -6.15E-12 -4.14E-12 S10 -1.35E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -5.28E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0184] from Fig. 20It can be seen that the MTF value of this embodiment is above 0.4 in the whole field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

[0185] Please refer to Table 11, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH and the maximum field of view FOV of the optical lens, and the numerical values ​​corresponding to each conditional expression in each embodiment.

[0186] Table 11

[0187]

[0188]

[0189] Table 11

[0190]

[0191]

[0192] In summary, the optical lens provided by the present invention improves the imaging quality of the optical lens, reduces aberrations, and improves the imaging quality of the optical lens by optimizing the shape, optical focal length, thickness, and spacing of each lens, so that the optical lens has one or more advantages such as small aperture, large image surface, miniaturization, and telephoto characteristics.

[0193] 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.

[0194] 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, comprising six lenses, characterized in that: Along the optical axis from the object side to the imaging surface, it includes: a first lens having negative optical power; a second lens having positive optical power; a third lens having positive refractive power; a fourth lens element having positive refractive power and a convex object-side surface; a fifth lens having negative optical power, wherein the object side surface is convex and the image side surface is concave or the object side surface is concave and the image side surface is convex; The sixth lens element has negative optical power and its object-side surface is concave and its image-side surface is convex.

2. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the total optical length TTL satisfy: 1.6 <TTL / f<2.5。 3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 0.55 <IH / f<0.7。 4. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the optical back focal length BFL satisfy: 0.2 <BFL / f<0.5。 5. The optical lens according to claim 1, characterized in that: The real image height IH, the total optical length TTL and the maximum field of view FOV corresponding to the maximum field of view of the optical lens satisfy the following conditions: 55.0<180°×TTL / IH / FOV<80.

0.

6. The optical lens according to claim 1, characterized in that: The sum ΣCT of the center thickness of each lens from the first lens to the sixth lens and the total optical length TTL of the optical lens satisfy the following: 0.5<ΣCT / TTL<0.

75.

7. The optical lens according to claim 1, characterized in that: The maximum field of view FOV of the optical lens, the real image height IH corresponding to the maximum field of view and the object side aperture D1 of the first lens meet the following conditions: 3.0 <D1 / IH / tan(FOV / 2)<4.0。 8. The optical lens according to claim 1, characterized in that: The focal length f2 of the second lens satisfies the effective focal length f of the optical lens: 0.9 <f2 / f。 9. The optical lens according to claim 1, characterized in that: The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: f6 / f<-0.

6.

10. The optical lens according to claim 1, characterized in that: The object side curvature radius R9 and the image side curvature radius R10 of the fifth lens satisfy: 0.5<|(R9-R10) / (R9+R10)|<0.

9.

11. The optical lens according to claim 1, characterized in that: The object side surface curvature radius R11 and the image side surface curvature radius R12 of the sixth lens satisfy: -0.7<(R11-R12) / (R11+R12)<-0.1.

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