Six-piece type optical lens group

Abstract

The invention provides a six-piece type optical lens group, which sequentially comprises a first lens with negative focal power from an object side to an image side, a second lens with negative focal power from the object side to the image side, a third lens with negative focal power and a fourth lens with negative focal power from the object side to the image side, the second lens has negative focal power, the object side surface of the second lens near the optical axis is a convex surface, and the image side surface of the second lens near the optical axis is a concave surface; the third lens has positive focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens near the optical axis is a convex surface; an aperture; the fourth lens has positive focal power, the object side surface of the fourth lens near the optical axis is a convex surface, and the image side surface of the fourth lens near the optical axis is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface near the optical axis, and the image side surface of the fifth lens is a concave surface near the optical axis; and the sixth lens has positive focal power. The imaging lens group phase difference can be corrected to improve the imaging quality of the imaging lens group.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to a six-piece optical lens group. Background Art

[0002] The vehicle-mounted surround view camera is an advanced assisted driving technology that uses multiple cameras to capture the vehicle's surrounding environment in real time and synthesizes these images into a bird's-eye view so that the driver can better understand the surrounding situation. This system usually consists of four or more cameras, which are installed on the front, rear and sides of the vehicle. Through computer vision technology, the captured video streams are processed and fused to generate a complete 360-degree picture without blind spots. In the existing technology, there is still a lot of room for improvement in vehicle-mounted surround view cameras, such as distortion problems, poor environmental adaptability, insufficient resolution, and night vision function defects. Therefore, how to effectively improve the image quality is a technical problem that needs to be solved urgently for vehicle-mounted surround view cameras. Summary of the invention

[0003] In view of the above problems, the present invention provides a six-piece optical lens group, which can correct the phase difference of the imaging lens group to improve the imaging quality of the imaging lens group.

[0004] To achieve the above-mentioned purpose, the present invention solves the problem through the following technical solutions: a six-piece optical lens group, comprising six lenses, which include, from the object side to the image side, a first lens with negative optical power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; a second lens with negative optical power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis; a third lens with positive optical power, the object side surface of the third lens is The optical axis of the third lens is convex, and the image side surface of the third lens is convex near the optical axis; an aperture; a fourth lens with positive focal power, the object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is convex near the optical axis; a fifth lens with negative focal power, the object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is concave near the optical axis; a sixth lens with positive focal power, the object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is convex near the optical axis;

[0005] The optical lens group satisfies the following conditional formula:

[0006] 0.6<(CT3-CT4) / AT34<110; wherein CT3 is the thickness of the third lens, CT4 is the thickness of the fourth lens, and AT34 is the air gap between the third lens and the fourth lens;

[0007] -2.2 < R1 / f1 < -1.8; where R1 is the radius of curvature of the object side surface of the first lens, and f1 is the focal length of the first lens;

[0008] 0.01 < AT34 / EFL < 0.23; where EFL is the effective focal length of the optical lens group.

[0009] The present invention provides another six-piece optical lens group, including six lenses, which sequentially include from the object side to the image side:

[0010] A first lens with negative optical power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis; a second lens with negative optical power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis; a third lens with positive optical power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis; an aperture; a fourth lens with positive optical power, the object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is convex near the optical axis; a fifth lens with negative optical power, the object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is concave near the optical axis; a sixth lens with positive optical power, the object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is convex near the optical axis;

[0011] The optical lens group satisfies the following conditional expressions:

[0012] 0.25 < (CT2 - CT1) / AT12 < 0.6; where CT2 is the thickness of the second lens, CT1 is the thickness of the first lens, and AT12 is the air gap between the first lens and the second lens; -2.2 < R1 / f1 < -1.8; 1.9 < EFL / CT1 < 2.4.

[0013] Preferably, the optical lens group satisfies the following condition: 30 < TTL / (AT45 + AT56) < 59; where TTL is the total lens length, AT45 is the air gap between the fourth lens and the fifth lens, and AT56 is the air gap between the fifth lens and the sixth lens.

[0014] Preferably, the optical lens group satisfies the following condition: -3.5 < R3 / f2 < -2.1; where R3 is the radius of curvature of the object side surface of the second lens, and f2 is the focal length of the second lens;

[0015] 0.8 < R7 / f4 < 1.0; where R7 is the radius of curvature of the object side surface of the fourth lens, and f4 is the focal length of the fourth lens.

[0016] Preferably, the optical lens group satisfies the following conditions: 1.3 < (CT3 - CT2) / AT23 < 2.8; where CT2 is the thickness of the second lens, and AT23 is the air gap between the second lens and the third lens.

[0017] Preferably, the optical lens group satisfies the following conditions:

[0018] 4.2 < (CT6 - CT5) / AT56 < 8.9; where CT6 is the thickness of the sixth lens, CT5 is the thickness of the fifth lens, and AT56 is the air gap between the fifth lens and the sixth lens;

[0019] 9 < TTL / CT5 < 35;

[0020] 42 < HFOV / ImgH < 50; where HFOV is the maximum half field of view angle of the optical lens group, and ImgH is the maximum image height of the optical lens group.

[0021] Preferably, the optical lens group satisfies the following conditions: 0.04 < AT45 / EFL < 0.15.

[0022] Preferably, the optical lens group satisfies the following conditions: 1 < EFL / CT5 < 3.6.

[0023] Preferably, the optical lens group satisfies the following conditions: 0.4 < (f4 + f5) / EFL < 0.8; where f5 is the focal length of the fifth lens.

[0024] Preferably, the optical lens group satisfies the following conditions: 39 < TTL / AT34 < 990; 68 < TTL / AT45 < 203; 10 < TTL / CT4 < 13.

[0025] The beneficial effects of the present invention are:

[0026] 1. Meeting the conditional formula 0.6 < (CT3 - CT4) / AT34 < 110 can appropriately adjust the thicknesses of the third lens and the fourth lens, making the spacing distribution of the lenses more appropriate, which is beneficial to correcting aberrations to improve imaging quality;

[0027] 2. Meeting the conditional formula 0.25 < (CT2 - CT1) / AT12 < 0.6 can enable the first lens and the second lens to cooperate with each other, which helps to balance the volume distribution of the image capture system group on the object side and the image side;

[0028] 3. Meeting the conditional formula -2.2 < R1 / f1 < -1.8 is beneficial to adjusting the light-gathering ability and controlling the field of view angle;

[0029] 4. Meeting the conditional formula 30 < TTL / (AT45 + AT56) < 59 can control the distance between the fourth lens and the fifth lens and the distance between the fifth lens and the sixth lens, which is beneficial to the miniaturization of the lens group;

[0030] 5. Meeting the conditional formula -3.5 < R3 / f2 < -2.1 can adjust the surface shape and refractive power of the second lens, which helps to compress the volume;

[0031] 6. Meeting the conditional formula 0.8 < R7 / f4 < 1.0 can adjust the surface shape and refractive power of the fourth lens, which helps to compress the volume;

[0032] 7. Meeting the conditional formula 1.3 < (CT3 - CT2) / AT23 < 2.8 can make the second lens and the third lens cooperate with each other, which helps to increase the viewing angle;

[0033] 8. Meeting the conditional formula 4.2 < (CT6 - CT5) / AT56 < 8.9 can appropriately adjust the thicknesses of the fifth lens and the sixth lens, making the distance distribution between the lenses more appropriate, which is beneficial to correcting the aberration to improve the imaging quality;

[0034] 9. Meeting the conditional formulas 0.01 < AT34 / EFL < 0.23 and 0.04 < AT45 / EFL < 0.15 can effectively control the back focal length, which is beneficial to shortening the total length of the system;

[0035] 10. Meeting the conditional formula 1.9 < EFL / CT1 < 2.4. Since shortening EFL helps to expand the field of view angle, and the optical effective diameter of the first lens is relatively large, the reduction amplitude of CT1 is relatively small. Therefore, the reduction amplitude of EFL is relatively large while the reduction amplitude of CT1 is relatively small;

[0036] 11. Meeting the conditional formula 1 < EFL / CT5 < 3.6 helps to balance the volume distribution of the optical image capture lens on the object side and the image side;

[0037] 12. Meeting the conditional formula 0.4 < (f4 + f5) / EFL < 0.8 helps to control an appropriate ratio between the focal lengths of the fourth lens and the fifth lens and the effective focal length of the overall lens group, and further controls the spherical chromatic aberration;

[0038] 13. Meeting the conditional formula 39 < TTL / AT34 < 990 helps to balance the spatial configuration between the third lens and the fourth lens while miniaturizing, so as to reduce the sensitivity of the lens group and the influence of assembly tolerances;

[0039] 14. Meeting the conditional formula 68 < TTL / AT45 < 203 helps to balance the spatial configuration between the fourth lens and the fifth lens while miniaturizing, so as to reduce the sensitivity of the lens group and the influence of assembly tolerances;

[0040] 15. Meeting the conditional formula 10 < TTL / CT4 < 13, controlling the ratio relationship between the total length of the optical system and the thickness of the fourth lens on the optical axis, avoiding the increase in the thickness tolerance sensitivity of the optical system due to the unreasonable thickness of the fourth lens. Meanwhile, it is also beneficial to realize the control of the assembly thickness tolerance of the entire optical system, thereby reducing the production cost. Below the lower limit of the relational formula, the thickness of the fourth lens increases, and the thickness tolerance sensitivity of the optical system increases, requiring better processability during manufacturing, thus increasing the production cost. Exceeding the upper limit of the relational formula, the optical total length of the optical system increases, which is not conducive to meeting the requirements of lightweight and miniaturization of the optical system;

[0041] 16. Meeting the conditional formula 9 < TTL / CT5 < 35, by reasonably controlling the relationship between the central thickness and the total length of the fifth lens, it is beneficial to correct the aberration of the on-axis field of view and improve the imaging quality;

[0042] 17. Meeting the conditional formula 42 < HFOV / ImgH < 50, which is beneficial to increasing the image height and the field of view angle while maintaining good imaging quality. Description of the Drawings

[0043] Figure 1 It is a schematic structural diagram of the optical lens group of Example 1.

[0044] Figure 2 It is the spherical aberration diagram of the optical lens group of Example 1.

[0045] Figure 3 It is the field curvature diagram of the optical lens group of Example 1.

[0046] Figure 4 It is the distortion diagram of the optical lens group of Example 1.

[0047] Figure 5 It is a schematic structural diagram of the optical lens group of Example 2.

[0048] Figure 6 It is the spherical aberration diagram of the optical lens group of Example 2.

[0049] Figure 7 It is the field curvature diagram of the optical lens group of Example 2.

[0050] Figure 8 It is the distortion diagram of the optical lens group of Example 2.

[0051] Fig. 9 It is a schematic structural diagram of the optical lens group of Example 3.

[0052] Fig.10 It is the spherical aberration diagram of the optical lens group of Example 3.

[0053] Fig.11Field curvature diagram of the optical lens group of Embodiment 3.

[0054] Fig.12 Distortion diagram of the optical lens group of Embodiment 3.

[0055] Reference numerals are: first lens 18, second lens 11, third lens 12, fourth lens 13, fifth lens 14, sixth lens 15, electronic photosensitive element 17, filter element 16, aperture 10. Detailed implementation manners

[0056] The present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the implementation manners of the present invention are not limited thereto.

[0057] The present invention discloses a six-piece optical lens group, including six lenses, which successively include from the object side to the image side: a first lens 18 with a negative optical power, the object side surface of the first lens 18 is convex near the optical axis, and the image side surface of the first lens 18 is concave near the optical axis; a second lens 11 with a negative optical power, the object side surface of the second lens 11 is convex near the optical axis, and the image side surface of the second lens 11 is concave near the optical axis; a third lens 12 with a positive optical power, the object side surface of the third lens 12 is convex near the optical axis, and the image side surface of the third lens 12 is convex near the optical axis; an aperture 10; a fourth lens 13 with a positive optical power, the object side surface of the fourth lens 13 is convex near the optical axis, and the image side surface of the fourth lens 13 is convex near the optical axis; a fifth lens 14 with a negative optical power, the object side surface of the fifth lens 14 is concave near the optical axis, and the image side surface of the fifth lens 14 is concave near the optical axis; a sixth lens 15 with a positive optical power, the object side surface of the sixth lens 15 is convex near the optical axis, and the image side surface of the sixth lens 15 is convex near the optical axis; a filter element 16 that does not affect the focal length and an electronic photosensitive element 17 are successively arranged between the sixth lens 15 and the image side, and the electronic photosensitive element 17 is arranged on the image side surface; the optical lens group satisfies the following conditional expressions:

[0058] 0.6 < (CT3 - CT4) / AT34 < 110; where CT3 is the thickness of the third lens 12, CT4 is the thickness of the fourth lens 13, and AT34 is the air gap between the third lens 12 and the fourth lens 13; conforming to this conditional expression can appropriately adjust the thicknesses of the third lens and the fourth lens, make the spacing distribution of the lenses more appropriate, and is beneficial to correcting aberration to improve imaging quality;

[0059] -2.2 < R1 / f1 < -1.8; where R1 is the radius of curvature of the object side surface of the first lens 18, and f1 is the focal length of the first lens 18; conforming to this conditional expression is beneficial to adjusting the light-gathering ability and controlling the field angle;

[0060] 0.01 < AT34 / EFL < 0.23; where EFL is the effective focal length of the optical lens group. Meeting this conditional expression can effectively control the back focal length and is conducive to shortening the total length of the system.

[0061] The present invention discloses another six-piece optical lens group, which includes a first lens 18 with a negative optical power, the object side of the first lens 18 near the optical axis is convex, and the image side of the first lens 18 near the optical axis is concave; a second lens 11 with a negative optical power, the object side of the second lens 11 near the optical axis is convex, and the image side of the second lens 11 near the optical axis is concave; a third lens 12 with a positive optical power, the object side of the third lens 12 near the optical axis is convex, and the image side of the third lens 12 near the optical axis is convex; an aperture 10; a fourth lens 13 with a positive optical power, the object side of the fourth lens 13 near the optical axis is convex, and the image side of the fourth lens 13 near the optical axis is convex; a fifth lens 14 with a negative optical power, the object side of the fifth lens 14 near the optical axis is concave, and the image side of the fifth lens 14 near the optical axis is concave; a sixth lens 15 with a positive optical power, the object side of the sixth lens 15 near the optical axis is convex, and the image side of the sixth lens 15 near the optical axis is convex; between the sixth lens 15 and the image side, a filter element 16 that does not affect the focal length and an electronic photosensitive element 17 are sequentially arranged, and the electronic photosensitive element 17 is arranged on the image side.

[0062] Meet the following conditional expression:

[0063] 0.25 < (CT2 - CT1) / AT12 < 0.6; where CT2 is the thickness of the second lens 11, CT1 is the thickness of the first lens 18, and AT12 is the air gap between the first lens 18 and the second lens 11. Meeting this conditional expression can make the first lens and the second lens cooperate with each other, which helps to balance the volume distribution of the image capture system group on the object side and the image side.

[0064] -2.2 < R1 / f1 < -1.8; Meeting this conditional expression is beneficial to adjusting the light-gathering ability and controlling the field of view angle.

[0065] 1.9 < EFL / CT1 < 2.4. Meeting this conditional expression is because when EFL shortens, it helps to expand the field of view angle, and since the optical effective diameter of the first lens is relatively large, the reduction amplitude of CT1 is relatively small. Therefore, the reduction amplitude of EFL is relatively large while the reduction amplitude of CT1 is relatively small.

[0066] The optical lens groups of both schemes meet the following conditional expression:

[0067] The optical lens group satisfies the following conditions: 30 < TTL / (AT45 + AT56) < 59; where TTL is the total lens length, AT45 is the air gap between the fourth lens 13 and the fifth lens 14, and AT56 is the air gap between the fifth lens 14 and the sixth lens 15. Meeting this conditional formula can control the distances between the fourth lens and the fifth lens and between the fifth lens and the sixth lens, which is beneficial to the miniaturization of the lens group.

[0068] Preferably, the optical lens group satisfies the following conditions: -3.5 < R3 / f2 < -2.1; where R3 is the curvature radius of the object side surface of the second lens 11, and f2 is the focal length of the second lens 11. Meeting this conditional formula can adjust the surface shape and refractive power of the second lens, which helps to compress the volume.

[0069] 0.8 < R7 / f4 < 1.0; where R7 is the curvature radius of the object side surface of the fourth lens 13, and f4 is the focal length of the fourth lens 13. Meeting this conditional formula can adjust the surface shape and refractive power of the fourth lens, which helps to compress the volume.

[0070] Preferably, the optical lens group satisfies the following conditions: 1.3 < (CT3 - CT2) / AT23 < 2.8; where CT2 is the thickness of the second lens 11, and AT23 is the air gap between the second lens 11 and the third lens 12. Meeting this conditional formula can make the second lens and the third lens cooperate with each other, which helps to increase the viewing angle.

[0071] Preferably, the optical lens group satisfies the following conditions: 4.2 < (CT6 - CT5) / AT56 < 8.9; where CT6 is the thickness of the sixth lens 15, CT5 is the thickness of the fifth lens 14, and AT56 is the air gap between the fifth lens 14 and the sixth lens 15. Meeting this conditional formula can appropriately adjust the thicknesses of the fifth lens and the sixth lens, making the distance distribution of the lenses more appropriate, which is beneficial to correcting the aberration to improve the imaging quality.

[0072] 9 < TTL / CT5 < 35. Meeting this conditional formula is beneficial to correcting the aberration of the on-axis field of view and improving the imaging quality by reasonably controlling the relationship between the central thickness of the fifth lens and the total length.

[0073] 42 < HFOV / ImgH < 50; where HFOV is the half field of view angle of the optical lens group, and ImgH is the image height of the optical lens group. Meeting this conditional formula is beneficial to increasing the image height and the field of view angle while maintaining good imaging quality.

[0074] Preferably, the optical lens group satisfies the following conditions: 0.04 < AT45 / EFL < 0.15. Meeting this conditional formula can effectively control the back focal length, which is beneficial to shortening the total length of the system.

[0075] Preferably, the optical lens group satisfies the following conditions: 1 < EFL / CT5 < 3.6. Meeting this conditional expression helps to balance the volume distribution of the optical image capture lens on the object side and the image side.

[0076] Preferably, the optical lens group satisfies the following conditions: 0.4 < (f4 + f5) / EFL < 0.8; where f5 is the focal length of the fifth lens 14. Meeting this conditional expression helps to control an appropriate ratio between the focal lengths of the fourth lens and the fifth lens and the effective focal length of the overall lens group, and further controls the spherical chromatic aberration.

[0077] Preferably, the optical lens group satisfies the following conditions: 39 < TTL / AT34 < 990. Meeting this conditional expression helps to balance the spatial configuration between the third lens and the fourth lens while miniaturizing, so as to reduce the sensitivity of the lens group and the influence of assembly tolerances.

[0078] 68 < TTL / AT45 < 203. Meeting this conditional expression helps to balance the spatial configuration between the fourth lens and the fifth lens while miniaturizing, so as to reduce the sensitivity of the lens group and the influence of assembly tolerances.

[0079] 10 < TTL / CT4 < 13. Meeting this conditional expression controls the ratio relationship between the total length of the optical system and the thickness of the fourth lens on the optical axis, avoiding the increase in the thickness tolerance sensitivity of the optical system due to the unreasonable thickness of the fourth lens. At the same time, it is also beneficial to control the assembly thickness tolerance of the entire optical system, thereby reducing the production cost; below the lower limit of the relational expression, the thickness of the fourth lens increases, and the thickness tolerance sensitivity of the optical system increases, requiring better processability during manufacturing, thereby increasing the production cost; exceeding the upper limit of the relational expression, the optical total length of the optical system increases, which is not conducive to meeting the requirements of lightweight and miniaturization of the optical system.

[0080] Example 1, as Figure 1-4 shown, the first lens 18 and the third lens 12 are made of glass materials, and the second lens 11, the fourth lens 13, the fifth lens 14, and the sixth lens 15 are made of optical plastic materials. A six-piece optical lens group provided in this example, the relevant parameters of each lens are shown in Table 1-1, and the aspheric parameters of each lens in this example are shown in Table 1-2.

[0081] Table 1-1

[0082]

[0083] Table 1-2

[0084]

[0085]

[0086] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0087]

[0088] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0089] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0090] R: radius of curvature of the lens at the near optical axis;

[0091] K: cone coefficient;

[0092] A i : i-th order aspheric coefficient.

[0093] Embodiment 2, as Figure 5-8 As shown, the first lens 18 and the third lens 12 are made of glass, and the second lens 11, the fourth lens 13, the fifth lens 14, and the sixth lens 15 are made of optical plastic. This embodiment provides a six-piece optical lens group, and the relevant parameters of each lens are shown in Table 2-1. The parameters of the aspherical surfaces of each lens in this embodiment are shown in Table 2-2.

[0094] Table 2-1

[0095]

[0096]

[0097] Table 2-2

[0098] 22a 22b 24a 24b 25a 25b 26a 26b K -2.31E+00 -9.38E-01 8.39E-01 -4.67E+00 2.94E+00 -1.39E+01 -7.05E+00 -1.37E+00 A4 -3.06E-02 -5.73E-02 9.13E-03 -1.39E-02 -1.12E-01 -4.21E-02 5.77E-03 1.06E-03 A6 2.68E-03 6.99E-03 -8.41E-03 -6.62E-02 -2.12E-02 3.05E-02 6.92E-04 8.49E-04 A8 9.92E-05 2.69E-03 1.74E-02 4.60E-02 1.32E-02 -1.04E-02 -2.85E-04 5.50E-04 A10 -3.83E-05 -8.62E-04 -1.20E-02 -3.77E-02 -3.26E-02 1.99E-03 2.57E-05 -1.15E-04 A12 2.31E-06 1.90E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0099] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0100]

[0101] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0102] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0103] R: radius of curvature of the lens at the near optical axis;

[0104] K: cone coefficient;

[0105] A i : i-th order aspheric coefficient.

[0106] Embodiment 3, as Figure 9-12As shown, the first lens 18 and the third lens 12 are made of glass, and the second lens 11, the fourth lens 13, the fifth lens 14, and the sixth lens 15 are made of optical plastic. This embodiment provides a six-piece optical lens group, and the relevant parameters of each lens are shown in Table 3-1. The parameters of the aspherical surfaces of each lens in this embodiment are shown in Table 3-2.

[0107] Table 3-1

[0108]

[0109]

[0110] Table 3-2

[0111] 32a 32b 34a 34b 35a 35b 36a 36b K -1.14E+01 -1.17E+00 -6.07E-01 -2.58E+01 6.58E+00 -1.92E+01 -1.24E+01 1.87E-01 A4 -5.76E-02 -8.25E-02 1.25E-02 -2.55E-01 -1.91E-01 3.65E-03 1.03E-02 1.74E-02 A6 1.39E-02 4.49E-02 4.06E-03 3.20E-01 2.42E-01 2.05E-02 1.97E-03 -6.19E-04 A8 -1.93E-03 -1.32E-02 1.22E-02 -2.28E-01 -1.85E-01 -9.50E-03 -1.69E-03 -1.96E-04 A10 1.57E-04 4.19E-03 -1.11E-02 4.82E-02 3.20E-02 1.66E-03 2.79E-04 5.52E-05 A12 -5.84E-06 -5.29E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0112] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0113]

[0114] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0115] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0116] R: radius of curvature of the lens at the near optical axis;

[0117] K: cone coefficient;

[0118] A i : i-th order aspheric coefficient.

[0119] The above embodiments only express three implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A six-piece optical lens assembly, characterized in that: It includes six lenses, which successively include from the object side to the image side: A first lens (18) with a negative focal power, the object side surface of the first lens (18) is convex near the optical axis, and the image side surface of the first lens (18) is concave near the optical axis; A second lens (11) with a negative focal power, the object side surface of the second lens (11) is convex near the optical axis, and the image side surface of the second lens (11) is concave near the optical axis; A third lens (12) with a positive focal power, the object side surface of the third lens (12) is convex near the optical axis, and the image side surface of the third lens (12) is convex near the optical axis; A diaphragm (10); A fourth lens (13) with a positive focal power, the object side surface of the fourth lens (13) is convex near the optical axis, and the image side surface of the fourth lens (13) is convex near the optical axis; A fifth lens (14) with a negative focal power, the object side surface of the fifth lens (14) is concave near the optical axis, and the image side surface of the fifth lens (14) is concave near the optical axis; A sixth lens (15) with a positive focal power, the object side surface of the sixth lens (15) is convex near the optical axis, and the image side surface of the sixth lens (15) is convex near the optical axis; The optical lens group satisfies the following conditional expressions: 0.6 < (CT3 - CT4) / AT34 < 110; where CT3 is the thickness of the third lens (12), CT4 is the thickness of the fourth lens (13), and AT34 is the air gap between the third lens (12) and the fourth lens (13); -2.2 < R1 / f1 < -1.8; where R1 is the curvature radius of the object side surface of the first lens (18), and f1 is the focal length of the first lens (18); 0.01 < AT34 / EFL < 0.23; where EFL is the effective focal length of the optical lens group.

2. A six-piece optical lens assembly, characterized in that: It includes six lenses, which successively include from the object side to the image side: A first lens (18) with a negative focal power, the object side surface of the first lens (18) is convex near the optical axis, and the image side surface of the first lens (18) is concave near the optical axis; A second lens (11) with a negative focal power, the object side surface of the second lens (11) is convex near the optical axis, and the image side surface of the second lens (11) is concave near the optical axis; A third lens (12) with a positive focal power, the object side surface of the third lens (12) is convex near the optical axis, and the image side surface of the third lens (12) is convex near the optical axis; A diaphragm (10); A fourth lens (13) with a positive focal power, the object side surface of the fourth lens (13) is convex near the optical axis, and the image side surface of the fourth lens (13) is convex near the optical axis; A fifth lens (14) with a negative focal power, the object side surface of the fifth lens (14) is concave near the optical axis, and the image side surface of the fifth lens (14) is concave near the optical axis; A sixth lens (15) with a positive focal power, the object side surface of the sixth lens (15) is convex near the optical axis, and the image side surface of the sixth lens (15) is convex near the optical axis; The optical lens group satisfies the following conditional expressions: 0.25 < (CT2 - CT1) / AT12 < 0.6; where CT2 is the thickness of the second lens (11), CT1 is the thickness of the first lens (18), and AT12 is the air gap between the first lens (18) and the second lens (11); -2.2 < R1 / f1 < -1.8; 1.9 < EFL / CT1 < 2.

4.

3. A six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 30 < TTL / (AT45 + AT56) < 59; where TTL is the total lens length, AT45 is the air gap between the fourth lens (13) and the fifth lens (14), and AT56 is the air gap between the fifth lens (14) and the sixth lens (15).

4. A six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: -3.5 < R3 / f2 < -2.1; where R3 is the curvature radius of the object side of the second lens (11), and f2 is the focal length of the second lens (11). 0.8 < R7 / f4 < 1.0; where R7 is the curvature radius of the object side of the fourth lens (13), and f4 is the focal length of the fourth lens (13).

5. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 1.3 < (CT3 - CT2) / AT23 < 2.8; where CT2 is the thickness of the second lens (11), and AT23 is the air gap between the second lens (11) and the third lens (12).

6. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 4.2 < (CT6 - CT5) / AT56 < 8.9; where CT6 is the thickness of the sixth lens (15), CT5 is the thickness of the fifth lens (14), and AT56 is the air gap between the fifth lens (14) and the sixth lens (15). 9 < TTL / CT5 < 35; 42 < HFOV / ImgH < 50; where HFOV is the maximum half field of view angle of the optical lens group, and ImgH is the maximum image height of the optical lens group.

7. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 0.04 < AT45 / EFL < 0.

15.

8. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 1 < EFL / CT5 < 3.

6.

9. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 0.4 < (f4 + f5) / EFL < 0.8; where f5 is the focal length of the fifth lens (14).

10. The six-piece optical lens assembly according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 39 < TTL / AT34 < 990; 68 < TTL / AT45 < 203; 10 < TTL / CT4 < 13.

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