Optical imaging lens

Abstract

The application discloses an optical imaging lens and belongs to the field of optical elements. The optical imaging lens comprises a super-wide-angle imaging lens. The super-wide-angle imaging lens comprises four plastic lenses and two glass lenses. The negative focal length of the first lens can ensure that the lens has a larger field of view. The object image side surface of the second lens with positive focal length and the object image side surface of the third lens with positive focal length are both convex, so that the overall combination of the system is compact, and the light is stable. The fourth lens with negative focal length, the fifth lens with positive focal length and the sixth lens with negative focal length are matched. The focal length is reasonably matched to ensure better imaging quality of the lens. The first lens is a spherical glass, and another spherical glass with positive focal length is matched, so that the lens still has a resolution comparable to that at normal temperature in the environment of-20° and 60°, thereby ensuring that the lens has stable performance in a harsh extreme environment.

Description

Technical Field

[0001] This invention relates to the field of optical elements, and more specifically, to optical imaging lenses. Background Technology

[0002] As display eyepieces, optical imaging lenses are the core optical components of VR headsets. The key indicators such as the imaging quality, weight, and size of the eyepieces directly affect the user's experience and comfort when wearing a VR headset. Therefore, miniaturization of eyepieces is an important trend in the development of VR headsets. On the other hand, with the advancement of display technology, higher requirements are also being placed on the imaging quality of the matching eyepieces.

[0003] With the progress of the times and the development of technology, virtual reality technology has gained more and more recognition and popularity; its simulated environment is so realistic that it is hard to distinguish from the real world, giving people a sense of immersion; with the development of virtual reality technology, more and more VR products have emerged, and VR wearable products are becoming smaller, lighter, and more standardized.

[0004] This invention is a lens for this type of product. Its overall length is short enough to facilitate the miniaturization of VR products, while the ultra-wide-angle lens meets the requirements of a wider field of view, enabling efficient shooting and pursuing richer and clearer details. The material uses a combination of glass and plastic lenses to ensure good image quality in extreme environments with high and low temperatures. It has more stable performance, better wear resistance and reliability, and is more suitable for the current development trend of VR products. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the present invention aims to provide an optical imaging lens that can achieve a wider field of view by using the negative optical power of the first lens. The positive optical power of the second and third lenses, both with convex object-image surfaces, ensures a compact overall system configuration and maintains smooth and stable light transmission. Furthermore, the combination of a negative optical power fourth lens, a positive optical power fifth lens, and a negative optical power sixth lens, through a reasonable combination of optical powers, ensures better image quality. The first lens is a spherical glass element, which, combined with another positive optical power spherical glass element, ensures that the lens maintains resolution comparable to that at room temperature even in environments of -20°C and 60°C, thus guaranteeing stable performance in harsh and extreme environments.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] An optical imaging lens, including an ultra-wide-angle imaging lens, the ultra-wide-angle imaging lens includes four plastic lenses and two glass lenses, and the four plastic lenses and the two glass lenses are arranged in sequence from the object side to the image side as follows:

[0010] The first lens, having a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0011] The second lens, having a positive optical power,

[0012] The third lens, having a positive optical power, both its object and image-side surfaces are convex;

[0013] The fourth lens, having a negative optical power, its image-side surface is concave;

[0014] The fifth lens, having a positive optical power, its image-side surface is convex;

[0015] The sixth lens, having a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0016] The optical imaging lens satisfies: 130° < 2*FOV < 180°, where FOV is the half field angle of the lens group of the system, and P1 is spherical glass, and the optical power of the other glass lens is positive to ensure good performance at high and low temperatures; the optical imaging lens satisfies: 1.15 < TTL / (2*ImgH) < 1.55, where TTL is the on-axis distance from the object side surface of the first lens to the image plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane. By controlling the ratio of the on-axis distance from the object side surface of the first lens to the image plane and half of the diagonal length of the effective pixel area on the imaging plane, the overall size of the imaging lens can be effectively shortened, so that the lens group can better meet the size requirements; the optical imaging lens satisfies: 3.1 < |f1 / EPD| < 4.6, where f1 is the effective focal length of the first lens, and EPD is the entrance pupil diameter of the optical imaging lens. By controlling the relationship between the focal length of the first lens and the entrance pupil diameter of the lens, the system aperture can be increased to improve the light transmission, and the picture texture can be improved, so that good imaging quality can be obtained even in a darker environment.

[0017] Further, the optical imaging lens satisfies: 1.45 < (R1 + R2) / (R1 - R2) < 1.80, where R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens. By this conditional formula, the shape of the first lens can be restricted, and at the same time, the optical power of the first lens can be controlled; while ensuring that the first lens has a reasonable optical power, the ghost image generated by the internal reflection of the first lens itself can be improved by optimizing the shape of the first lens.

[0018] Further, the optical imaging lens satisfies: 0.9 < f3 / f < 1.4, where f is the effective focal length of the optical imaging lens, and f3 is the effective focal length of the third lens. By reasonably combining the effective focal length of the third lens and the effective focal length of the optical imaging lens, it can be used to converge and converge light rays, adjust the optical power ratio within a certain range, and is beneficial to balancing the off-axis aberration of the system.

[0019] Further, the optical imaging lens satisfies: 0.4 < CT4 / ET4 < 0.6, where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens. By controlling the ratio of the central thickness of the fourth lens to the edge thickness, it is beneficial to optimizing the shape of the fourth lens and is conducive to actual processing and forming. At the same time, the optical power of the fourth lens can be distributed, combined with the third lens, which is beneficial to balancing and optimizing the spherical aberration, chromatic aberration, etc. of the system, and enables the system to have good imaging quality.

[0020] Further, the optical imaging lens satisfies: 0.12 < CT1 / (CT2 + CT3) < 0.45, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the ratio of the central thickness of the first lens to the sum of the central thicknesses of the second and third lenses within this range, it helps to optimize the spherical aberration of the system, and at the same time can optimize and improve the optical distortion of the system to a certain extent.

[0021] Further, the optical imaging lens satisfies: 1.0 < |f3 / R6| < 1.9, where f3 is the effective focal length of the third lens, and R6 is the curvature radius of the image side of the third lens. By controlling the effective focal length of the third lens and the curvature radius of the image side of the third lens, it is beneficial to controlling the shape of the third lens and improving the process performance of the third lens. At the same time, it is beneficial to the optimization of the field curvature of the system and reduces the aberration of the system.

[0022] Further, the optical imaging lens satisfies: 1.4 < |f1 / f| < 2.0, where f is the effective focal length of the optical imaging lens, and f1 is the effective focal length of the first lens. By reasonably controlling the effective focal length of the first lens, it can generate positive spherical aberration and balance the negative spherical aberration generated by other lenses of the optical imaging lens, thereby improving the on-axis imaging quality of the optical imaging lens.

[0023] Further, the optical imaging lens satisfies: 1.2 < |f4 / f| < 1.8, where f is the effective focal length of the optical imaging lens, and f4 is the effective focal length of the fourth lens. By reasonably distributing the ratio of the effective focal length of the fourth lens to the effective focal length of the optical imaging lens, the on-axis spherical aberration generated by it can be constrained within a reasonable range, and it can be ensured that the fourth lens is not too thin or too thick to guarantee its actual processability.

[0024] Furthermore, the optical imaging lens satisfies: 1.5 < (CT5 + CT6) / T56 < 4, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. By controlling the ratio of the sum of the central thicknesses of the fifth and sixth lenses on the optical axis to the air gap between the fifth lens and the sixth lens on the optical axis, it is beneficial to optimize and improve the shapes of the fifth and sixth lenses, which is conducive to actual processing and forming. Furthermore, the purpose of optimizing the field curvature can be achieved. At the same time, the ghost images generated by reflection between the fifth and sixth lenses and other lenses can be controlled and optimized through this condition.

[0025] Furthermore, the optical imaging lens satisfies: 0.4 < |(R11 + R12) / R10| < 2.5, where R11 is the curvature radius of the image side of the sixth lens, R12 is the curvature radius of the object side of the sixth lens, and R10 is the curvature radius of the image side of the fifth lens. Through this conditional equation, the shapes of the fifth and sixth lenses can be controlled, which is beneficial to ensure the processing and forming of these two lenses, reduce sensitivity, and at the same time, the stray light at the end of the system can be improved through the shapes of the fifth and sixth lenses.

[0026] 3. Beneficial effects

[0027] Compared with the prior art, the advantages of the present invention are as follows:

[0028] (1) This solution can achieve a larger field angle by the negative optical power of the first lens, and the object and image side surfaces of the second lens with positive optical power and the third lens with positive optical power are both convex surfaces, ensuring the compactness of the overall system combination and keeping the light rays gentle and stable. At the same time, it is paired with a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. By reasonably matching the optical powers, better imaging quality of the lens can be ensured, and the first lens is a spherical glass and is paired with another spherical glass with positive optical power, so as to ensure that the lens still has the same resolution as at room temperature in the environments of -20° and 60°, thus ensuring the stable performance of the lens in harsh and extreme environments.

[0029] (2) In this solution, the optical imaging lens satisfies: 1.45 < (R1 + R2) / (R1 - R2) < 1.80, where R1 is the curvature radius of the object side of the first lens and R2 is the curvature radius of the image side of the first lens. Through this conditional equation, the shape of the first lens can be restricted, and at the same time, the optical power of the first lens can be controlled. While ensuring that the first lens has a reasonable optical power, the ghost images generated by internal reflection of the first lens itself can be improved by optimizing the shape of the first lens.

[0030] (3) In this solution, the optical imaging lens satisfies: 0.9 < f3 / f < 1.4, where f is the effective focal length of the optical imaging lens, and f3 is the effective focal length of the third lens. By reasonably combining the effective focal length of the third lens and the effective focal length of the optical imaging lens, it can be used to converge and converge light, adjust the light power ratio within a certain range, and is beneficial to balancing the off-axis aberration of the system.

[0031] (4) In this solution, the optical imaging lens satisfies: 0.4 < CT4 / ET4 < 0.6, where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens. By controlling the ratio of the central thickness of the fourth lens to the edge thickness, it is beneficial to optimizing the shape of the fourth lens and is beneficial to actual processing and forming. At the same time, the optical power of the fourth lens can be distributed, combined with the third lens, which is beneficial to balancing and optimizing the spherical aberration, chromatic aberration, etc. of the system, and enables the system to have good imaging quality.

[0032] (5) In this solution, the optical imaging lens satisfies: 0.12 < CT1 / (CT2 + CT3) < 0.45, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the ratio of the central thickness of the first lens to the sum of the central thicknesses of the second and third lenses within this range, it helps to optimize the spherical aberration of the system, and at the same time can optimize and improve the optical distortion of the system to a certain extent.

[0033] (6) In this solution, the optical imaging lens satisfies: 1.0 < |f3 / R6| < 1.9, where f3 is the effective focal length of the third lens, and R6 is the curvature radius of the image side of the third lens. By controlling the effective focal length of the third lens and the curvature radius of the image side of the third lens, it is beneficial to controlling the shape of the third lens and improving the process performance of the third lens. At the same time, it is beneficial to the optimization of the field curvature of the system and reduces the aberration of the system.

[0034] (7) In this solution, the optical imaging lens satisfies: 1.4 < |f1 / f| < 2.0, where f is the effective focal length of the optical imaging lens, and f1 is the effective focal length of the first lens. By reasonably controlling the effective focal length of the first lens, it can generate positive spherical aberration and balance the negative spherical aberration generated by other lenses of the optical imaging lens, thereby improving the on-axis imaging quality of the optical imaging lens.

[0035] (8) In this solution, the optical imaging lens satisfies: 1.2 < |f4 / f| < 1.8, where f is the effective focal length of the optical imaging lens, and f4 is the effective focal length of the fourth lens. By reasonably distributing the ratio of the effective focal length of the fourth lens to the effective focal length of the optical imaging lens, the on-axis spherical aberration generated by it can be constrained within a reasonable range, and it can be ensured that the fourth lens is not too thin or too thick to ensure its actual processability.

[0036] (9) In this solution, the optical imaging lens satisfies: 1.5 < (CT5 + CT6) / T56 < 4, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis. By controlling the ratio of the sum of the central thicknesses of the fifth and sixth lenses on the optical axis to the air gap between the fifth lens and the sixth lens on the optical axis, it is beneficial to optimize and improve the shapes of the fifth lens and the sixth lens, which is conducive to actual processing and forming, and further can achieve the purpose of optimizing field curvature. At the same time, the ghost images generated by the reflection between the fifth lens, the sixth lens and other lenses can be controlled and optimized through this condition.

[0037] (10) In this solution, the optical imaging lens satisfies: 0.4 < |(R11 + R12) / R10| < 2.5, where R11 is the curvature radius of the image side of the sixth lens, R12 is the curvature radius of the object side of the sixth lens, and R10 is the curvature radius of the image side of the fifth lens. Through this conditional formula, the shapes of the fifth and sixth lenses can be controlled, which is beneficial to ensure the processing and forming of these two lenses, reduce sensitivity, and at the same time, the stray light at the end of the system can be improved through the shapes of the fifth and sixth lenses. Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of the optical imaging lens of Embodiment 1 of the present invention;

[0039] Figure 2 It is a schematic diagram of the axial chromatic aberration curve of the optical imaging lens of Embodiment 1 of the present invention;

[0040] Figure 3 It is a schematic structural diagram of the astigmatism curve of the optical imaging lens of Embodiment 1 of the present invention;

[0041] Figure 4 It is a schematic structural diagram of the distortion curve of the optical imaging lens of Embodiment 1 of the present invention;

[0042] Figure 5 It is a schematic structural diagram of the optical imaging lens of Embodiment 2 of the present invention;

[0043] Figure 6 It is a schematic diagram of the axial chromatic aberration curve of the optical imaging lens of Embodiment 2 of the present invention;

[0044] Figure 7 It is a schematic structural diagram of the astigmatism curve of the optical imaging lens of Embodiment 2 of the present invention;

[0045] Figure 8 It is a schematic structural diagram of the distortion curve of the optical imaging lens of Embodiment 2 of the present invention;

[0046] Figure 9This is a schematic diagram of the optical imaging lens structure of Embodiment 3 of the present invention;

[0047] Figure 10 This is a schematic diagram of the on-axis chromatic aberration curve of the optical imaging lens in Embodiment 3 of the present invention;

[0048] Figure 11 This is a schematic diagram of the astigmatism curve structure of the optical imaging lens in Embodiment 3 of the present invention;

[0049] Figure 12 This is a schematic diagram of the distortion curve structure of the optical imaging lens in Embodiment 3 of the present invention;

[0050] Figure 13 This is a schematic diagram of the optical imaging lens structure of Embodiment 4 of the present invention;

[0051] Figure 14 This is a schematic diagram of the on-axis chromatic aberration curve of the optical imaging lens in Embodiment 4 of the present invention;

[0052] Figure 15 This is a schematic diagram of the astigmatism curve structure of the optical imaging lens in Embodiment 4 of the present invention;

[0053] Figure 16 This is a schematic diagram of the distortion curve structure of the optical imaging lens in Embodiment 4 of the present invention;

[0054] Figure 17 This is a schematic diagram of the optical imaging lens structure of Embodiment 5 of the present invention;

[0055] Figure 18 This is a schematic diagram of the on-axis chromatic aberration curve of the optical imaging lens in Embodiment 5 of the present invention;

[0056] Figure 19 This is a schematic diagram of the astigmatism curve structure of the optical imaging lens in Embodiment 5 of the present invention;

[0057] Figure 20 This is a schematic diagram of the distortion curve structure of the optical imaging lens in Embodiment 5 of the present invention. Detailed Implementation

[0058] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0059] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] Example 1:

[0062] Please see Figure 1-20 An optical imaging lens, including an ultra-wide-angle imaging lens, characterized in that: the ultra-wide-angle imaging lens comprises four plastic lenses and two glass lenses, the four plastic lenses and two glass lenses being arranged in the following order from the object side to the image side:

[0063] The first lens has negative optical power, and its object-side surface is convex and its image-side surface is concave.

[0064] The second lens has positive optical power.

[0065] The third lens has positive optical power, and its object-image side surfaces are all convex.

[0066] The fourth lens has negative optical power and its image-side surface is concave.

[0067] The fifth lens has positive optical power and its image-side surface is convex.

[0068] The sixth lens has negative optical power, and its object-side surface is convex while its image-side surface is concave.

[0069] The optical imaging lens satisfies: 130° < 2*FOV < 180°, where FOV is the half field angle of the lens group of the system, and P1 is spherical glass. The optical power of the other glass lens is positive to ensure good performance at high and low temperatures. The optical imaging lens satisfies: 1.15 < TTL / (2*IMH) < 1.55, where TTL is the axial distance from the object side surface of the first lens to the image plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane. By controlling the ratio of the axial distance from the object side surface of the first lens to the image plane and half of the diagonal length of the effective pixel area on the imaging plane, the overall size of the imaging lens can be effectively shortened, so that the lens group can better meet the size requirements. The optical imaging lens satisfies: 3.1 < |f1 / EPD| < 4.6, where f1 is the effective focal length of the first lens and EPD is the entrance pupil diameter of the optical imaging lens. By controlling the relationship between the focal length of the first lens and the entrance pupil diameter of the lens, the system aperture can be increased to improve the light transmission, and the picture quality can be improved, so that good imaging quality can also be obtained in a relatively dark environment.

[0070] The optical imaging lens satisfies: 1.45 < (R1 + R2) / (R1 - R2) < 1.80, where R1 is the curvature radius of the object side surface of the first lens and R2 is the curvature radius of the image side surface of the first lens. Through this conditional formula, the shape of the first lens can be constrained, and at the same time, the optical power of the first lens can be controlled. While ensuring that the first lens has a reasonable optical power, the ghost image generated by internal reflection within the first lens itself can be improved by optimizing the shape of the first lens.

[0071] The optical imaging lens satisfies: 0.9 < f3 / f < 1.4, where f is the effective focal length of the optical imaging lens and f3 is the effective focal length of the third lens. By reasonably combining the effective focal length of the third lens and the effective focal length of the optical imaging lens, it can be used to converge and converge light rays, and adjust the optical power ratio within a certain range, which is beneficial to balancing the off-axis aberration of the system.

[0072] The optical imaging lens satisfies: 0.4 < CT4 / ET4 < 0.6, where CT4 is the central thickness of the fourth lens on the optical axis and ET4 is the edge thickness of the fourth lens. By controlling the ratio of the central thickness and the edge thickness of the fourth lens, it is beneficial to optimize the shape of the fourth lens and is beneficial to actual processing and forming. At the same time, the optical power of the fourth lens can be distributed. Combined with the third lens, it is beneficial to balance and optimize the spherical aberration, chromatic aberration, etc. of the system, so that the system has good imaging quality.

[0073] The optical imaging lens satisfies: 0.12 < CT1 / (CT2 + CT3) < 0.45, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. By controlling the ratio of the central thickness of the first lens to the sum of the central thicknesses of the second and third lenses within this range, it helps to optimize the spherical aberration of the system and, to a certain extent, can optimize and improve the optical distortion of the system.

[0074] The optical imaging lens satisfies: 1.0 < |f3 / R6| < 1.9, where f3 is the effective focal length of the third lens and R6 is the curvature radius of the image side of the third lens. By controlling the effective focal length of the third lens and the curvature radius of the image side of the third lens, it is beneficial to control the lens shape of the third lens and improve the process performance of the third lens. At the same time, it is beneficial to optimize the field curvature of the system and reduce the aberration of the system.

[0075] The optical imaging lens satisfies: 1.4 < |f1 / f| < 2.0, where f is the effective focal length of the optical imaging lens and f1 is the effective focal length of the first lens. By reasonably controlling the effective focal length of the first lens, it can generate positive spherical aberration and balance the negative spherical aberration generated by other lenses of the optical imaging lens, thereby improving the on-axis imaging quality of the optical imaging lens.

[0076] The optical imaging lens satisfies: 1.2 < |f4 / f| < 1.8, where f is the effective focal length of the optical imaging lens and f4 is the effective focal length of the fourth lens. By reasonably allocating the ratio of the effective focal length of the fourth lens to the effective focal length of the optical imaging lens, the on-axis spherical aberration generated by it can be constrained within a reasonable range, and it can be ensured that the fourth lens is not too thin or too thick to guarantee its actual processability.

[0077] [[ID=?]]There seems to be a typo in your original text. It should be (CT5 + CT6) / T56 instead of (CT5+CT6) / T56 in the following content. The optical imaging lens satisfies: 1.5 < (CT5 + CT6) / T56 < 4, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth and sixth lenses on the optical axis. By controlling the ratio of the sum of the central thicknesses of the fifth and sixth lenses on the optical axis to the air gap between the fifth and sixth lenses on the optical axis, it is beneficial to optimize and improve the shapes of the fifth and sixth lenses, which is conducive to actual processing and forming. Furthermore, it can achieve the purpose of optimizing the field curvature. At the same time, the ghost images generated by the reflection between the fifth and sixth lenses and other lenses can be controlled and optimized through this condition.

[0078] The optical imaging lens satisfies: 0.4 < |(R11+R12) / R10| < 2.5, where R11 is the radius of curvature of the image side of the sixth lens, R12 is the radius of curvature of the object side of the sixth lens, and R10 is the radius of curvature of the image side of the fifth lens. This condition can control the shape of the fifth and sixth lenses, which is beneficial to ensure the processing and shaping of these two lenses, reduce sensitivity, and improve the stray light at the end of the system by the shape of the fifth and sixth lenses.

[0079] This invention ensures a wider field of view for the lens by using the negative optical power of the first lens. The positive optical power of the second and third lenses, both with convex object-image surfaces, ensures a compact overall system and maintains smooth and stable light transmission. Furthermore, the combination of a negative optical power fourth lens, a positive optical power fifth lens, and a negative optical power sixth lens, through a reasonable combination of optical powers, ensures better image quality. The first lens is a spherical glass element, which, combined with another positive optical power spherical glass element, ensures that the lens maintains resolution comparable to that at room temperature even in environments of -20°C and 60°C, thus guaranteeing stable performance in harsh and extreme environments.

[0080] Table 1: Basic parameters of the optical imaging lens in Example 1

[0081] Face number Surface type radius of curvature thickness Material Conic coefficient OBJ spherical unlimited unlimited S1 spherical 5.6730 0.3000 1.75,52.3 S2 spherical 1.5985 1.4627 S3 aspherical 5.4314 0.5209 1.67,19.2 -50.7714 S4 aspherical -10.6883 0.3500 69.9751 Aperture aspherical unlimited 0.1771 S6 aspherical 5.7366 0.5725 1.67,54.7 -12.2995 S7 aspherical -1.9731 0.0200 -11.0006 S8 aspherical 12.9331 0.3000 1.67,19.2 99.0000 S9 aspherical 1.8171 0.1784 -12.5429 S10 aspherical 18.2855 0.7949 1.54,55.9 -67.288 S11 aspherical -2.2784 0.5148 -1.8882 S12 aspherical 1.2520 0.4827 1.54,55.6 -7.3300 S13 aspherical 0.9198 0.6741 -1.6018 S14 spherical unlimited 0.21 1.52,64.2 S15 spherical unlimited 0.3399 IMA spherical unlimited 0

[0082] Table 2: Higher-order term coefficients of S3-S13 for each aspherical mirror in Example 1

[0083] Face number A4 A6 A8 A10 A12 A14 A16 S3 9.3956E-03 -3.5857E-02 -5.5994E-03 7.3205E-02 -1.5536E-01 1.6043E-01 -9.1531E-02 S4 -1.4729E-02 -1.3961E-02 8.3124E-03 -5.8884E-02 1.3036E-01 -1.3964E-01 8.0388E-02 S6 -3.6317E-02 3.7272E-01 -4.3801E+00 2.6061E+01 -9.5914E+01 2.1695E+02 -2.9408E+02 S7 -1.4136E-01 6.6253E-01 -3.6043E+00 1.0465E+01 -1.8046E+01 1.6873E+01 -5.8875E+00 S8 -2.6363E-01 1.3088E+00 -6.4730E+00 2.0190E+01 -4.0331E+01 5.1738E+01 -4.1151E+01 S9 -7.8753E-02 4.6049E-01 -1.5172E+00 3.1425E+00 -4.1872E+00 3.5974E+00 -1.9207E+00 S10 -2.2165E-02 2.3913E-01 -5.2762E-01 8.7679E-01 -1.0836E+00 9.4480E-01 -5.4098E-01 S11 -1.6568E-01 3.4558E-01 -5.5115E-01 7.9325E-01 -8.3407E-01 6.0596E-01 -2.8075E-01 S12 -8.7650E-02 -2.2508E-01 3.9710E-01 -3.5706E-01 2.0032E-01 -7.2211E-02 1.6245E-02 S13 -3.5771E-01 2.7670E-01 -1.6028E-01 6.7590E-02 -2.0282E-02 4.1527E-03 -5.4563E-04 Face number A18 A20 A22 A24 A26 A28 A30 S3 2.7404E-02 -3.3220E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -2.3165E-02 2.6041E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 2.1772E+02 -6.7331E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -2.2335E+00 1.7467E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.8472E+01 -3.5754E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 5.7974E-01 -7.5517E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 1.8049E-01 -2.6414E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 7.3525E-02 -8.2718E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -2.0616E-03 1.1173E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 4.1064E-05 -1.3322E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0084] Example 2:

[0085] Table 3: Basic parameters of the optical imaging lens in Example 2

[0086] Face number Surface type radius of curvature thickness Material Conic coefficient OBJ spherical unlimited unlimited S1 spherical 4.7409 0.2600 1.69,56.2 S2 spherical 1.3007 1.1949 S3 aspherical -18.4869 1.2852 1.67,19.2 -3.6615 S4 aspherical -5.3261 0.040 -1.0623 Aperture spherical unlimited 0.0500 S6 aspherical 1.7357 0.7200 1.54,55.9 -0.0345 S7 aspherical -1.6071 0.0500 -0.0027 S8 aspherical 9.8556 0.2200 1.67,19.2 69.0098 S9 aspherical 1.4653 0.3144 -0.0191 S10 aspherical 18.4314 0.5956 1.54,55.9 -99.0000 S11 aspherical -5.7167 0.4277 0.6781 S12 aspherical 1.3632 0.5375 1.54,55.7 -4.3805 S13 aspherical 1.2528 0.6223 -2.1705 S14 spherical unlimited 0.2100 1.52,64.2 S15 spherical unlimited 0.3724 IMA spherical unlimited 0.0000

[0087] Table 4: Higher-order term coefficients of S3-S13 for each aspherical mirror in Example 2

[0088] Face number A4 A6 A8 A10 A12 A14 A16 S3 -6.0614E-02 7.3697E-02 -3.1071E-01 7.1884E-01 -9.1930E-01 5.1826E-01 1.6653E-01 S4 -2.6276E-01 6.3936E-01 -2.9441E-02 -9.6828E+00 5.3110E+01 -1.5639E+02 2.8290E+02 S6 -3.3558E-01 1.2025E+00 -5.8359E+00 2.4826E+01 -7.6300E+01 1.5702E+02 -2.0907E+02 S7 1.9870E-01 -1.8136E+00 9.8112E+00 -3.5928E+01 9.0564E+01 -1.5505E+02 1.7498E+02 S8 -1.7505E-01 -9.9931E-01 4.7714E+00 -1.0852E+01 1.4921E+01 -1.2508E+01 6.0149E+00 S9 -2.7203E-01 -1.8972E-01 2.2214E+00 -8.1961E+00 2.1334E+01 -4.0428E+01 5.3487E+01 S10 1.5417E-02 1.9348E-01 -8.5668E-01 2.2080E+00 -3.5681E+00 3.7568E+00 -2.5309E+00 S11 -1.4211E-01 2.0189E-01 1.2961E-02 -3.9368E-01 6.4712E-01 -5.0457E-01 2.0903E-01 S12 -1.4055E-01 3.1290E-02 -1.1935E-02 6.2903E-03 -7.8717E-04 -3.1142E-04 1.1075E-04 S13 -1.3611E-01 3.8396E-02 2.1614E-03 -9.0434E-03 4.5602E-03 -1.1885E-03 1.7181E-04 Face number A18 A20 A22 A24 A26 A28 A30 S3 -4.3378E-01 2.4480E-01 -4.8503E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -3.1277E+02 1.9376E+02 -5.1372E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.7194E+02 -7.8980E+01 1.5443E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.2308E+02 4.8156E+01 -7.7913E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.3813E+00 7.9440E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -4.7287E+01 2.6433E+01 -8.4232E+00 1.1658E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 9.8915E-01 -1.7047E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -4.4567E-02 3.8739E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -1.3002E-05 5.4317E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 -1.2774E-05 3.7305E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0089] Example 3:

[0090] Table 5: Basic parameters of the optical imaging lens in Example 3

[0091] Face number Surface type radius of curvature thickness Material Conic coefficient OBJ spherical unlimited unlimited S1 spherical 4.3688 0.2600 1.67,56.2 S2 spherical 1.2190 1.1443 S3 aspherical -13.3417 1.2691 1.64,23.5 44.3259 S4 aspherical -3.7383 -0.0105 0.4621 Aperture spherical unlimited 0.0500 S6 aspherical 2.2063 0.8031 1.54,55.9 -1.7055 S7 aspherical -1.3274 0.0500 -1.2638 S8 aspherical 18.2920 0.3000 1.67,19.2 99.0000 S9 aspherical 1.4905 0.3371 -0.7668 S10 aspherical -6.9564 0.5188 1.54,55.9 6.3516 S11 aspherical -2.0340 0.5696 -2.8185 S12 aspherical 1.3902 0.3505 1.54,55.7 -8.6608 S13 aspherical 1.0436 0.6494 -3.2020 S14 spherical unlimited 0.2100 1.52,64.2 S15 spherical unlimited 0.2987 IMA spherical unlimited 0.0000

[0092] Table 6: Higher-order term coefficients of S3-S13 for each aspherical mirror in Example 3

[0093] Face number A4 A6 A8 A10 A12 A14 A16 S3 -5.3786E-02 8.6233E-02 -4.3345E-01 1.2755E+00 -2.3584E+00 2.7768E+00 -2.0178E+00 S4 -7.2702E-02 1.9153E-01 1.3970E+00 -1.7594E+01 9.1521E+01 -2.6763E+02 4.5496E+02 S6 -6.5187E-02 4.4909E-01 -2.1173E+00 6.9250E+00 -1.6102E+01 2.5342E+01 -2.5823E+01 S7 6.5684E-02 -3.2759E-01 1.5695E-01 2.7602E+00 -1.2435E+01 2.6386E+01 -3.0855E+01 S8 -2.6964E-01 1.5569E-01 -8.7039E-01 4.0148E+00 -9.9856E+00 1.4882E+01 -1.3047E+01 S9 -3.0400E-01 5.0632E-01 -1.1443E+00 2.6402E+00 -4.6236E+00 5.6421E+00 -4.4940E+00 S10 -1.2805E-02 1.8540E-01 -3.4605E-01 4.7980E-01 -3.1740E-01 -4.9271E-02 2.2381E-01 S11 -1.5997E-01 3.2975E-01 -6.4966E-01 1.2132E+00 -1.5977E+00 1.4179E+00 -7.7178E-01 S12 -1.4329E-01 -5.2604E-02 1.3546E-01 -1.0308E-01 4.1465E-02 -8.9096E-03 8.8056E-04 S13 -2.2005E-01 1.7129E-01 -1.1408E-01 5.9865E-02 -2.3230E-02 6.1777E-03 -1.0464E-03 Face number A18 A20 A22 A24 A26 A28 A30 S3 8.2556E-01 -1.4541E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -4.1888E+02 1.6179E+02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.5708E+01 -4.3178E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.9041E+01 -4.7800E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 6.3154E+00 -1.3350E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.1060E+00 -4.3888E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -1.4036E-01 3.0323E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 2.2599E-01 -2.6990E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -1.0249E-05 -2.9906E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 1.0094E-04 -4.1975E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0094] Example 4:

[0095] Table 7: Basic parameters of the optical imaging lens in Example 4

[0096] Face number Surface type radius of curvature thickness Material Conic coefficient OBJ spherical unlimited unlimited S1 spherical 5.6005 0.3500 1.75,52.3 S2 spherical 1.4679 1.4000 S3 aspherical 18.6801 0.5697 1.67,19.2 -76.1572 S4 aspherical -4.2120 0.3945 2.0856 Aperture spherical unlimited 0.0635 S6 aspherical 2.8485 0.6843 1.54,56.1 8.6080 S7 aspherical -1.5278 0.0200 -7.3119 S8 aspherical -5.5197 0.3000 1.66,20.4 -99.0000 S9 aspherical 2.2380 0.2373 -30.2548 S10 spherical -194.9467 0.8615 1.67,54.7 S11 spherical -2.1448 0.7519 S12 aspherical 3.5620 0.6924 1.54,55.6 2.7379 S13 aspherical 1.6751 0.4703 -2.2568 S14 spherical unlimited 0.2100 S15 spherical unlimited 0.2944 IMA spherical unlimited 0.0000

[0097] Table 8: Higher-order term coefficients of S3-S13 for each aspherical mirror in Example 4

[0098] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.2379E-02 -1.3431E-03 1.4896E-02 -1.6079E-01 6.2110E-01 -1.3974E+00 1.9699E+00 S4 4.0118E-02 -1.1617E-01 5.7576E-01 -2.4299E+00 7.0408E+00 -1.3988E+01 1.8941E+01 S6 5.8298E-02 -1.1320E-01 1.5542E+00 -2.1450E+01 1.6115E+02 -7.5135E+02 2.2576E+03 S7 -7.0468E-02 5.2543E-02 4.7271E+00 -5.7433E+01 3.3349E+02 -1.1915E+03 2.7772E+03 S8 -4.0738E-01 1.2981E+00 -3.7009E+00 -8.6206E+00 1.4005E+02 -6.8543E+02 1.9270E+03 S9 -3.8113E-02 -2.2962E-01 3.2331E+00 -1.8622E+01 6.6930E+01 -1.5877E+02 2.5279E+02 S12 -2.2688E-01 6.9685E-01 -3.3830E+00 1.0279E+01 -2.0906E+01 2.9623E+01 -2.9942E+01 S13 -7.6565E-02 5.6585E-05 1.2698E-02 -6.2830E-03 1.3724E-03 -7.5364E-05 -6.1681E-05 Face number A18 A20 A22 A24 A26 A28 A30 S3 -1.7795E+00 1.0042E+00 -3.2346E-01 4.5617E-02 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.7171E+01 9.9731E+00 -3.3584E+00 4.9957E-01 0.0000E+00 0.0000E+00 0.0000E+00 S6 -4.3891E+03 5.3369E+03 -3.6894E+03 1.1055E+03 0.0000E+00 0.0000E+00 0.0000E+00 S7 -4.2481E+03 4.1199E+03 -2.2996E+03 5.6251E+02 0.0000E+00 0.0000E+00 0.0000E+00 S8 -3.3850E+03 3.6720E+03 -2.2525E+03 5.9767E+02 0.0000E+00 0.0000E+00 0.0000E+00 S9 -2.6774E+02 1.8121E+02 -7.1011E+01 1.2269E+01 0.0000E+00 0.0000E+00 0.0000E+00 S12 2.1856E+01 -1.1544E+01 4.3689E+00 -1.1548E+00 2.0243E-01 -2.1142E-02 9.9578E-04 S13 3.7000E-05 -1.4002E-05 3.7415E-06 -6.8964E-07 8.3265E-08 -5.9081E-09 1.8597E-10

[0099] Example 5:

[0100] Table 9: Basic Parameters of the Optical Imaging Lens in Example 5

[0101] Face number Surface type radius of curvature thickness Material Conic coefficient OBJ spherical unlimited unlimited S1 spherical 11.1727 0.5579 1.75,52.3 S2 spherical 2.2164 2.8500 S3 spherical 2.6962 0.7149 1.80,35.0 S4 spherical 34.6885 0.3511 Aperture spherical unlimited 0.2203 S6 aspherical 99.9741 0.5523 1.54,56.0 -99.0000 S7 aspherical -1.4184s 0.0200 -4.5955 S8 aspherical -4.7833 0.3500 1.67,19.2 -99.0000 S9 aspherical 2.8619 0.1000 -44.6749 S10 aspherical -32.3783 1.1587 1.54,56.0 99.0000 S11 aspherical -1.5499 0.4145 0.0000 S12 aspherical 2.3462 0.4870 1.54,55.6 0.1938 S13 aspherical 1.0481 0.5983 -2.4244 S14 spherical unlimited 0.2100 1.52,64.2 S15 spherical unlimited 0.3605 IMA spherical unlimited 0.0000

[0102] Table 10: Higher-order term coefficients of S6-S13 for each aspherical mirror in Example 5

[0103] Face number A4 A6 A8 A10 A12 A14 A16 S6 -3.5433E-02 2.4712E-01 -3.5900E+00 2.3166E+01 -9.1655E+01 2.2247E+02 -3.2304E+02 S7 1.3406E-01 -2.4024E+00 1.5952E+01 -7.3100E+01 2.1881E+02 -4.2141E+02 5.0168E+02 S8 -1.6832E-01 -1.0200E+00 7.3332E+00 -3.1665E+01 8.8085E+01 -1.5752E+02 1.7452E+02 S9 1.6728E-02 -2.8290E-01 9.3787E-01 -2.2906E+00 4.0847E+00 -5.0406E+00 4.1494E+00 S10 7.7667E-02 -5.7988E-02 -1.8759E-02 7.7814E-02 -4.3027E-02 -8.6115E-03 1.9841E-02 S11 1.1911E-02 -1.7132E-02 2.1508E-01 -5.0988E-01 6.9579E-01 -6.0398E-01 3.4179E-01 S12 -3.6735E-01 1.6239E-01 -1.2148E-03 -1.0546E-01 1.1834E-01 -7.7136E-02 3.3667E-02 S13 -2.7600E-01 2.4476E-01 -1.6840E-01 8.6116E-02 -3.2175E-02 8.5679E-03 -1.5722E-03 Face number A18 A20 A22 A24 A26 A28 A30 S6 2.5507E+02 -8.3601E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -3.3571E+02 9.6491E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.0902E+02 2.9381E+01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -2.1666E+00 6.4684E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -8.7349E-03 1.3633E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -1.2233E-01 2.5260E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -9.7002E-03 1.6588E-03 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 1.8803E-04 -1.3157E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0104] In Examples 1-5, the optical parameters are as follows:

[0105] Example parameters 1 2 3 4 5 f1(mm) -3.034 -2.646 -2.504 -2.725 -3.750 f2 (mm) 5.390 10.633 7.667 5.124 3.595 f3 (mm) 2.269 1.655 1.651 1.928 2.570 f4 (mm) -3.154 -2.570 -2.414 -2.353 -2.595 f5 (mm) 3.767 8.066 5.079 3.246 2.947 f6 (mm) -13.112 41.187 -12.059 -6.751 -4.058 f(mm) 1.806 1.684 1.670 1.835 1.904 TTL(mm) 6.900 6.900 6.800 7.300 8.950 IMH(mm) 2.978 2.928 2.928 2.928 2.978

[0106] The conditional expressions in Examples 1-5 satisfy the conditions in the table below:

[0107] Implementation Example Conditional 1 2 3 4 5 2*FOV 160.6 176.7 174.8 138.9 162.6 TTL / (2*IMH) 1.159 1.178 1.161 1.247 1.503 |f1 / EPD| 3.830 3.222 3.268 3.415 4.470 (R1+R2) / (R1-R2) 1.785 1.756 1.774 1.710 1.495 f3 / f 1.256 0.983 0.989 1.051 1.350 CT4 / ET4 0.547 0.412 0.459 0.500 0.579 CT1 / (CT2+CT3) 0.274 0.130 0.126 0.279 0.440 |f3 / R6| 1.150 1.030 1.244 1.262 1.812 |f1 / f| 1.680 1.572 1.499 1.485 1.970 |f4 / f| 1.746 1.526 1.446 1.282 1.363 (CT5+CT6) / T56 2.482 2.649 1.526 2.067 3.970 |(R11+R12) / R10| 0.953 0.458 1.197 2.442 2.190

[0108] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An optical imaging lens, including an ultra-wide-angle imaging lens, characterized in that: The ultra-wide-angle imaging lens includes four plastic lenses and two glass lenses. The four plastic lenses and the two glass lenses are arranged in sequence from the object side to the image side as follows: The first lens, having a negative optical power, with its object-side surface being convex and its image-side surface being concave; The second lens, having a positive optical power, The third lens, having a positive optical power, with both its object and image-side surfaces being convex; The fourth lens, having a negative optical power, with its image-side surface being concave; The fifth lens, having a positive optical power, with its image-side surface being convex; The sixth lens, having a negative optical power, with its object-side surface being convex and its image-side surface being concave; The optical imaging lens satisfies: 130° < 2*FOV < 180°, where FOV is the half field angle of the ultra-wide-angle imaging lens; 1.15 < TTL / (2*IMH) < 1.55, where TTL is the axial distance from the object side surface of the first lens to the image plane, and IMH is half of the diagonal length of the effective pixel area on the imaging plane; 3.1 < |f1 / EPD| < 4.6, where f1 is the effective focal length of the first lens, and EPD is the entrance pupil diameter of the optical imaging lens; 1.45 < (R1+R2) / (R1-R2) < 1.80, where R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens; 0.4 < CT4 / ET4 < 0.6, where CT4 is the central thickness of the fourth lens on the optical axis, and ET4 is the edge thickness of the fourth lens; 0.12 < CT1 / (CT2+CT3) < 0.45, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis; 1.2 < |f4 / f| < 1.8, where f is the effective focal length of the optical imaging lens, and f4 is the effective focal length of the fourth lens; 1.5 < (CT5+CT6) / T56 < 4, where CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

2. The optical imaging lens according to claim 1, characterized in that: The optical imaging lens satisfies: 0.9 < f3 / f < 1.4, where f is the effective focal length of the optical imaging lens, and f3 is the effective focal length of the third lens.

3. The optical imaging lens according to claim 1, characterized in that: The optical imaging lens satisfies: 1.0 < |f3 / R6| < 1.9, where f3 is the effective focal length of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

4. The optical imaging lens according to claim 1, characterized in that: The optical imaging lens satisfies: 1.4 < |f1 / f| < 2.0, where f is the effective focal length of the optical imaging lens, and f1 is the effective focal length of the first lens.

5. The optical imaging lens according to claim 1, characterized in that: The optical imaging lens satisfies: 0.4 < |(R11+R12) / R10| < 2.5, where R11 is the curvature radius of the image side surface of the sixth lens, R12 is the curvature radius of the object side surface of the sixth lens, and R10 is the curvature radius of the image side surface of the fifth lens.

Images