Day and night confocal fisheye optical lens group for vehicle

Abstract

The invention provides a day and night confocal fisheye optical lens group for a vehicle, which comprises six lenses, the invention relates to an imaging lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, an aperture, a fourth lens with positive focal power, a fifth lens with negative focal power and a sixth lens with positive focal power from an object side to an image side, and the part, close to an optical axis, of the object side surface of the sixth lens is a convex surface. The part, close to the optical axis, of the image side face of the sixth lens is a convex face. The optical lens group satisfies the following conditional expressions:-21lt; r3 / f2lt; -1; -184 lt;-184 lt; r < 10 > / R < T > 5 < lt >; -15,-15; 0.8 lt; r7 / f3lt; 1.2; the lens can adjust the light receiving capability, increase the field angle of the lens, reduce the imaging aberration, shorten the back focal length and improve the imaging quality.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to a day-and-night confocal fisheye optical lens group for vehicles. Background Art

[0002] The day-night confocal fisheye lens is a special optical lens that combines the functions of ultra-wide angle and day-night confocal. It can maintain a consistent focus under different lighting conditions. It is suitable for all-weather monitoring and other application scenarios that require large-scale, no-dead-angle shooting, such as scene monitoring, medical endoscopy, drone shooting, and engineering measurement. Especially in security systems, the day-night confocal fisheye lens can provide a wide field of view and clear images, and maintain good monitoring effects both during the day and at night. The design of the day-night confocal fisheye lens usually includes multiple lenses, which are arranged in a specific order to optimize the propagation path and focusing ability of light. For example, a design may include nine lenses, each with a specific optical power and shape to achieve the advantages of large aperture, 4k ultra-clear resolution, low temperature drift, and day-night confocality; with the development of technology, how to continuously improve the imaging quality of the day-night confocal fisheye lens and reduce the size of the lens system is an urgent problem to be solved by engineers in the industry. Summary of the invention

[0003] In view of the above problems, the present invention provides a day and night confocal fisheye optical lens group for automobiles, which can adjust the light collecting ability, increase the lens field of view, reduce imaging aberrations, shorten the back focal length, and improve imaging quality.

[0004] To achieve the above-mentioned purpose, the present invention solves the problem through the following technical solutions: a day and night confocal fisheye optical lens group for automobiles, 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 at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens with negative optical power, the object side surface of the second lens is convex at the near optical axis, and the image side surface of the second lens is concave at the near optical axis; a third lens with positive optical power, the object side surface of the third lens is convex at the near optical axis The third lens has a convex surface on the image side near the optical axis; an aperture; a fourth lens with positive focal power, the object side of the fourth lens is convex at the near optical axis, and the image side of the fourth lens is convex at the near optical axis; a fifth lens with negative focal power, the object side of the fifth lens is concave at the near optical axis, and the image side of the fifth lens is convex at the near optical axis; a sixth lens with positive focal power, the object side of the sixth lens is convex at the near optical axis, and the image side of the sixth lens is convex at the near optical axis; the optical lens group satisfies the following conditional formula:

[0005] -21 < R3 / f2 < -1, where f2 is the focal length of the second lens and R3 is the curvature radius of the object side of the second lens;

[0006] -184 < R10 / CT5 < -15, where R10 is the curvature radius of the image side of the fifth lens and CT5 is the thickness of the fifth lens;

[0007] 0.8 < R7 / f3 < 1.2, where R7 is the curvature radius of the object side of the fourth lens and f3 is the focal length of the third lens.

[0008] The present invention provides another vehicle day-night confocal fish-eye optical lens group, which includes six lenses, and sequentially includes from the object side to the image side: a first lens with a 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 a 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 a 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 a 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 a 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 convex near the optical axis; a sixth lens with a 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; the optical lens group satisfies the following conditional expressions:

[0009] -21 < R3 / f2 < -1, where f2 is the focal length of the second lens and R3 is the curvature radius of the object side of the second lens;

[0010] 1.5 < (R3 - R4) / EFL < 34, where R4 is the curvature radius of the image side of the second lens and EFL is the effective focal length of the optical lens group;

[0011] -0.1 < (CT2 - CT1) / AT12 < 0.2, 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.

[0012] Preferably, the optical lens group satisfies the following conditions:

[0013] 4 < (R11 - R12) / EFL < 18.5, where EFL is the effective focal length of the optical lens group, R11 is the curvature radius of the object side of the sixth lens, and R12 is the curvature radius of the image side of the sixth lens;

[0014] -5.5 < R12 / f6 < -1.5; where R12 is the radius of curvature of the image side of the sixth lens, and f6 is the focal length of the sixth lens.

[0015] Preferably, the optical lens group satisfies the following condition: 4 < R10 / f5 < 38; where R10 is the radius of curvature of the image side of the fifth lens, and f5 is the focal length of the fifth lens.

[0016] Preferably, the optical lens group satisfies the following conditions: -18.5 < R12 / CT6 < -1.5; where R12 is the radius of curvature of the image side of the sixth lens, and CT6 is the thickness of the sixth lens; 17 < Imgh * TTL < 51; where Imgh is the maximum image height of the imaging height of the optical lens group, and TTL is the total lens length of the optical lens group.

[0017] Preferably, the optical lens group satisfies the following condition: 34 < HFOV / Imgh < 57; where HFOV is half of the maximum field of view angle of the optical lens group, and Imgh is the maximum image height of the imaging height of the optical lens group.

[0018] Preferably, the optical lens group satisfies the following condition: 7 < (CT3 + CT4) / AT34 < 23; where 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.

[0019] -3 < (CT5 - CT6) / AT56 < -0.8; where CT5 is the thickness of the fifth lens, CT6 is the thickness of the sixth lens, and AT56 is the air gap between the fifth lens and the sixth lens.

[0020] Preferably, the optical lens group satisfies the following condition: 0.5 < AT56 / Imgh < 2.6; where AT56 is the air gap between the fifth lens and the sixth lens, and Imgh is the maximum image height of the imaging height of the optical lens group.

[0021] Preferably, the optical lens group satisfies the following condition: 9.5 < TTL / EFL < 12; where TTL is the total lens length of the optical lens group, and EFL is the effective focal length of the optical lens group.

[0022] Preferably, the optical lens group satisfies the following condition: 2 < f6 / EFL < 3.5; where f6 is the focal length of the sixth lens, and EFL is the effective focal length of the optical lens group.

[0023] The beneficial effects of the present invention are:

[0024] 1. Satisfy the conditional formula -21 < R3 / f2 < -1, 0.8 < R7 / f3 < 1.2, adjust the light-gathering ability to increase the field angle of the lens;

[0025] 2. Satisfy the conditional formula -184 < R10 / CT5 < -15, which is beneficial to correcting chromatic aberration and can adjust the lens volume at the same time;

[0026] 3. Satisfy the conditional formula 1.5 < (R3 - R4) / EFL < 34, which helps to control the strength configuration of the second lens with an appropriate lens shape and refractive power, can avoid excessive change in the refractive power of the image-side end lens, is beneficial to reducing imaging aberration, and at the same time, maintains an appropriate ratio with the effective focal length of the entire optical lens group;

[0027] 4. Satisfy the conditional formula -0.1 < (CT2 - CT1) / AT12 < 0.2, which can appropriately allocate the thicknesses of the first lens and the second lens, effectively balance the lens configuration to improve the molding quality, and at the same time, can avoid interference between the first lens and the second lens, which is beneficial to the assembly of the lens;

[0028] 5. Satisfy the conditional formula 4 < (R11 - R12) / EFL < 18.5, which is more beneficial to adjusting the lens shape and the strength configuration of the refractive power of the sixth lens, can avoid excessive change in the refractive power of the image-side end lens, effectively correct high-order aberrations, and at the same time, maintains an appropriate ratio with the effective focal length of the overall optical lens group;

[0029] 6. Satisfy the conditional formula 4 < R10 / f5 < 38, which is beneficial to adjusting the lens focal length, and is also beneficial to correcting chromatic aberration and achieving the visibility of visible light and infrared light;

[0030] 7. Satisfy the conditional formula -18.5 < R12 / CT6 < -1.5, which helps to shorten the back focal length and is beneficial to setting the optical imaging lens in a miniaturized electronic device;

[0031] 8. Satisfy the conditional formula -5.5 < R12 / f6 < -1.5, which can adjust the focal length of the lens and is beneficial to correcting aberrations;

[0032] 9. Satisfy the conditional formula 34 < HFOV / Imgh < 57, which can increase the imaging area to adapt to different imaging scenarios;

[0033] 10. Satisfy the conditional formula 7 < (CT3 + CT4) / AT34 < 23, which keeps the thicknesses of the third lens and the fourth lens within an appropriate range to correct the aberrations generated by the second lens, and allows for an appropriate spacing between the third lens and the fourth lens to correct off-axis image curvature and other aberrations;

[0034] 11. Satisfy the conditional expression -3 < (CT5 - CT6) / AT56 < -0.8, so that the thicknesses of the fifth lens and the sixth lens are within an appropriate range to correct the aberration generated by the fourth lens, and there is an appropriate distance between the fifth lens and the sixth lens to correct off-axis aberration such as image curvature;

[0035] 12. Satisfy the conditional expression 17 < Imgh*TTL < 51, which is beneficial to miniaturize the imaging lens system to avoid an overly large volume of the imaging system, making the imaging lens system more suitable for application in electronic devices;

[0036] 13. Satisfy the conditional expression 2 < f6 / EFL < 3.5. By reasonably designing the ratio range of the focal length f6 of the sixth lens to the effective focal length EFL of the optical lens group, the angle between the marginal ray and the optical axis can be effectively reduced, enabling the light to enter at a relatively gentle angle. A small-angle incidence can effectively reduce the aberration caused by subsequent lenses;

[0037] 14. Satisfy the conditional expression 0.5 < AT56 / Imgh < 2.6, which is beneficial to correcting off-axis aberration;

[0038] 15. Satisfy the conditional expression 9.5 < TTL / EFL < 12, which can adjust the lens length and make the design more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the optical lens group of Embodiment 1.

[0040] Figure 2 It is the spherical aberration diagram of the optical lens group of Embodiment 1.

[0041] Figure 3 It is the field curvature diagram of the optical lens group of Embodiment 1.

[0042] Figure 4 It is the distortion diagram of the optical lens group of Embodiment 1.

[0043] Figure 5 It is the longitudinal chromatic aberration of the optical lens group of Embodiment 1.

[0044] Figure 6 It is a schematic structural diagram of the optical lens group of Embodiment 2.

[0045] Figure 7 It is the spherical aberration diagram of the optical lens group of Embodiment 2.

[0046] Figure 8 It is the field curvature diagram of the optical lens group of Embodiment 2.

[0047] Fig. 9 It is the distortion diagram of the optical lens group of Embodiment 2.

[0048] Fig.10 This is the longitudinal chromatic aberration of the optical lens group of Example 2.

[0049] Fig.11 Schematic diagram of the structure of the optical lens assembly of Example 3.

[0050] Fig.12 This is a spherical aberration diagram of the optical lens group of Example 3.

[0051] Fig.13 This is a field curvature diagram of the optical lens group of Example 3.

[0052] Fig.14 This is a distortion diagram of the optical lens group of Example 3.

[0053] Fig.15 This is the longitudinal chromatic aberration of the optical lens group of Example 3.

[0054] The reference numerals are: a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , a fifth lens 15 , a sixth lens 16 , a filter element 17 , an electronic photosensitive element 18 , and an aperture 10 . DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto.

[0056] The invention discloses that the invention solves the problem through the following technical scheme: a day and night confocal fisheye optical lens group for vehicle, comprising six lenses, which in sequence from the object side to the image side include: a first lens 11 with negative optical power, the object side surface of the first lens 11 is convex at the near optical axis, and the image side surface of the first lens 11 is concave at the near optical axis; a second lens 12 with negative optical power, the object side surface of the second lens 12 is convex at the near optical axis, and the image side surface of the second lens 12 is concave at the near optical axis; a third lens 13 with positive optical power, the object side surface of the third lens 13 is convex at the near optical axis, and the image side surface of the third lens 13 is convex at the near optical axis; an aperture 10; a fourth lens 14 with positive focal power, the object side surface of the fourth lens 14 is convex near the optical axis, and the image side surface of the fourth lens 14 is convex near the optical axis; a fifth lens 15 with negative focal power, the object side surface of the fifth lens 15 is concave near the optical axis, and the image side surface of the fifth lens 15 is convex near the optical axis; a sixth lens 16 with positive focal power, the object side surface of the sixth lens 16 is convex near the optical axis, and the image side surface of the sixth lens 16 is convex near the optical axis; a filter element 17 and an electronic photosensitive element 18 that do not affect the focal length are arranged in sequence between the sixth lens 16 and the image side; the optical lens group satisfies the following conditional formula:

[0057] -21 < R3 / f2 < -1, where f2 is the focal length of the second lens 12 and R3 is the curvature radius of the object side of the second lens 12. Meeting this conditional expression can adjust the light-gathering ability and increase the field of view angle of the lens.

[0058] -184 < R10 / CT5 < -15, where R10 is the curvature radius of the image side of the fifth lens 15 and CT5 is the thickness of the fifth lens 15. Meeting this conditional expression is beneficial to correcting chromatic aberration and can also adjust the lens volume.

[0059] 0.8 < R7 / f3 < 1.2, where R7 is the curvature radius of the object side of the fourth lens 14 and f3 is the focal length of the third lens 13. Meeting this conditional expression can adjust the light-gathering ability and increase the field of view angle of the lens.

[0060] The present invention provides another vehicle-used day-night confocal fish-eye optical lens group, which includes six lenses. From the object side to the image side, it successively includes: a first lens 11 with a negative optical power, the object side surface of the first lens 11 is convex near the optical axis, and the image side surface of the first lens 11 is concave near the optical axis; a second lens 12 with a negative optical power, the object side surface of the second lens 12 is convex near the optical axis, and the image side surface of the second lens 12 is concave near the optical axis; a third lens 13 with a positive optical power, the object side surface of the third lens 13 is convex near the optical axis, and the image side surface of the third lens 13 is convex near the optical axis; an aperture 10; a fourth lens 14 with a positive optical power, the object side surface of the fourth lens 14 is convex near the optical axis, and the image side surface of the fourth lens 14 is convex near the optical axis; a fifth lens 15 with a negative optical power, the object side surface of the fifth lens 15 is concave near the optical axis, and the image side surface of the fifth lens 15 is convex near the optical axis; a sixth lens 16 with a positive optical power, the object side surface of the sixth lens 16 is convex near the optical axis, and the image side surface of the sixth lens 16 is convex near the optical axis; between the sixth lens 16 and the image side, a filter element 17 that does not affect the focal length and an electronic photosensitive element 18 are successively arranged; the optical lens group satisfies the following conditional expressions:

[0061] -21 < R3 / f2 < -1, where f2 is the focal length of the second lens 12 and R3 is the curvature radius of the object side of the second lens 12. Meeting this conditional expression can adjust the light-gathering ability and increase the field of view angle of the lens.

[0062] 1.5 < (R3 - R4) / EFL < 34, where R4 is the curvature radius of the image side of the second lens 12 and EFL is the effective focal length of the optical lens group. Meeting this conditional expression helps to control the second lens to have an appropriate lens shape and refractive power strength configuration, can avoid excessive change in the refractive power of the lens at the image side end, is beneficial to reducing imaging aberration, and at the same time, maintains an appropriate ratio with the effective focal length of the entire optical lens group.

[0063] -0.1 < (CT2 - CT1) / AT12 < 0.2; where CT2 is the thickness of the second lens 12, CT1 is the thickness of the first lens 11, and AT12 is the air gap between the first lens 11 and the second lens 12. Meeting this conditional formula can appropriately adjust the thicknesses of the first lens and the second lens, effectively balance the lens configuration to improve the molding quality, and at the same time, avoid interference between the first lens and the second lens, which is conducive to the assembly of the lenses.

[0064] Preferably, the optical lens group meets the following conditions:

[0065] 4 < (R11 - R12) / EFL < 18.5; where EFL is the effective focal length of the optical lens group, R11 is the curvature radius of the object side of the sixth lens 16, and R12 is the curvature radius of the image side of the sixth lens 16. Meeting this conditional formula is more conducive to adjusting the lens shape and refractive power intensity configuration of the sixth lens, avoiding excessive changes in the refractive power of the lens at the image side end, effectively correcting high-order aberrations, and at the same time, maintaining an appropriate ratio with the effective focal length of the overall optical lens group.

[0066] -5.5 < R12 / f6 < -1.5; where R12 is the curvature radius of the image side of the sixth lens 16, and f6 is the focal length of the sixth lens 16. Meeting this conditional formula can adjust the focal length of the lens, which is conducive to correcting aberrations.

[0067] Preferably, the optical lens group meets the following conditions: 4 < R10 / f5 < 38; where R10 is the curvature radius of the image side of the fifth lens 15, and f5 is the focal length of the fifth lens 15. Meeting this conditional formula is conducive to adjusting the focal length of the lens, and at the same time, is conducive to correcting chromatic aberration and achieving the visibility of visible light and infrared light.

[0068] Preferably, the optical lens group meets the following conditions: -18.5 < R12 / CT6 < -1.5; where R12 is the curvature radius of the image side of the sixth lens 16, and CT6 is the thickness of the sixth lens 16. Meeting this conditional formula helps to shorten the back focal length, which is conducive to setting the optical imaging lens in a miniaturized electronic device.

[0069] 17 < Imgh*TTL < 51; where Imgh is the maximum image height of the imaging height of the optical lens group, and TTL is the total lens length of the optical lens group. Meeting this conditional formula can contribute to the miniaturization of the imaging lens system to avoid an overly large volume of the imaging system, making the imaging lens system more suitable for application in electronic devices.

[0070] Preferably, the optical lens group meets the following conditions:

[0071] 34 < HFOV / Imgh < 57; where HFOV is half of the maximum field of view angle of the optical lens group, and Imgh is the maximum image height of the imaging height of the optical lens group. Meeting this conditional formula can increase the imaging area to adapt to different imaging scenarios.

[0072] Preferably, the optical lens group meets the following conditions:

[0073] 7 < (CT3 + CT4) / AT34 < 23; where CT3 is the thickness of the third lens 13, CT4 is the thickness of the fourth lens 14, and AT34 is the air gap between the third lens 13 and the fourth lens 14. Meeting this conditional formula keeps the thicknesses of the third lens and the fourth lens within an appropriate range to correct the aberration generated by the second lens, and provides an appropriate spacing between the third lens and the fourth lens to correct off-axis image curvature and other aberrations.

[0074] -3 < (CT5 - CT6) / AT56 < -0.8; where CT5 is the thickness of the fifth lens 15, CT6 is the thickness of the sixth lens 16, and AT56 is the air gap between the fifth lens 15 and the sixth lens 16. Meeting this conditional formula keeps the thicknesses of the fifth lens and the sixth lens within an appropriate range to correct the aberration generated by the fourth lens, and provides an appropriate spacing between the fifth lens and the sixth lens to correct off-axis image curvature and other aberrations.

[0075] Preferably, the optical lens group meets the following conditions:

[0076] 0.5 < AT56 / Imgh < 2.6; where AT56 is the air gap between the fifth lens 15 and the sixth lens 16, and Imgh is the maximum image height of the imaging height of the optical lens group. Meeting this conditional formula is beneficial for correcting off-axis aberrations.

[0077] Preferably, the optical lens group meets the following conditions:

[0078] 9.5 < TTL / EFL < 12; where TTL is the total lens length of the optical lens group, and EFL is the effective focal length of the optical lens group. Meeting this conditional formula can adjust the lens length to make the design more flexible.

[0079] Preferably, the optical lens group meets the following conditions:

[0080] 2 < f6 / EFL < 3.5; where f6 is the focal length of the sixth lens 16, and EFL is the effective focal length of the optical lens group. Meeting this conditional formula, through a reasonable design of the ratio range between the focal length f6 of the sixth lens and the effective focal length EFL of the optical lens group, can effectively reduce the angle between the marginal ray and the optical axis, making the light rays incident at a relatively gentle angle. A small incident angle can effectively reduce the aberrations caused by subsequent lenses.

[0081] Embodiment 1, as Figure 1-5 As shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are all made of plastic. This embodiment provides a day and night confocal fisheye optical lens group for automobiles, and the relevant parameters of each lens are shown in Table 1-1, and the parameters of the aspherical surfaces of each lens in this embodiment are shown in Table 1-2.

[0082] Table 1-1

[0083]

[0084]

[0085] Table 1-2

[0086] 12a 12b 14a 14b 15a 15b 16a 16b K -1.43E+03 -1.47E+00 -1.11E+00 -2.41E-02 -1.91E-02 3.69E+01 -1.25E-01 6.76E+01 A4 -3.18E-03 2.39E-02 -4.82E-03 -1.53E-02 -1.20E-02 -1.53E-02 -2.22E-02 -1.22E-03 A6 1.42E-04 -2.72E-03 -2.44E-03 3.48E-03 5.71E-03 5.72E-03 2.49E-03 3.16E-04 A8 -4.23E-06 1.84E-04 6.45E-04 7.06E-03 7.75E-03 -1.03E-03 -7.71E-04 -3.22E-04 A10 7.35E-08 -1.54E-05 -3.06E-03 -2.10E-03 -2.02E-03 -4.57E-07 5.60E-05 3.41E-05 A12 0.00E+00 0.00E+00 0.00E+00 -1.33E-03 -1.29E-03 3.61E-05 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 0.00E+00 5.14E-04 6.23E-04 -1.51E-06 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00 0.00E+00 2.37E-07 2.37E-07 -3.84E-07 0.00E+00 0.00E+00

[0087] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0088]

[0089] 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;

[0090] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0091] R: radius of curvature of the lens at the near optical axis;

[0092] K: cone coefficient;

[0093] A i : i-th order aspheric coefficient.

[0094] Embodiment 2, as Figure 6-10 As shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are all made of plastic. This embodiment provides a day and night confocal fisheye optical lens group for automobiles, and the relevant parameters of each lens are shown in Table 2-1, and the parameters of the aspherical surfaces of each lens in this embodiment are shown in Table 2-2.

[0095] Table 2-1

[0096]

[0097]

[0098] Table 2-2

[0099] 22a 22b 24a 24b 25a 25b 26a 26b K -3.24E+02 -1.44E+00 -3.49E+00 0.00E+00 -5.35E-02 3.32E+01 -3.66E-01 5.33E+01 A4 -1.59E-02 1.26E-01 -3.32E-02 -8.70E-02 -3.86E-02 -7.76E-02 -1.25E-01 -1.98E-03 A6 2.04E-03 -3.43E-02 -2.90E-02 3.59E-02 1.04E-01 8.92E-02 4.10E-02 4.75E-03 A8 -2.02E-04 9.40E-03 2.87E-02 2.97E-01 3.46E-01 -3.93E-02 -3.17E-02 -1.40E-02 A10 4.88E-06 -5.04E-03 -4.32E-01 -2.65E-01 -2.51E-01 2.12E-03 6.66E-03 4.26E-03 A12 0.00E+00 0.00E+00 0.00E+00 -4.93E-01 -4.76E-01 1.32E-02 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 0.00E+00 5.38E-01 6.89E-01 -2.84E-03 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00 0.00E+00 7.55E-04 7.55E-04 -1.23E-03 0.00E+00 0.00E+00

[0100] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0101]

[0102] 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;

[0103] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0104] R: radius of curvature of the lens at the near optical axis;

[0105] K: cone coefficient;

[0106] A i : i-th order aspheric coefficient.

[0107] Embodiment 3, as Figure 11-15 As shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are all made of plastic. This embodiment provides a day and night confocal fisheye optical lens group for automobiles, and the relevant parameters of each lens are shown in Table 3-1, and the parameters of the aspherical surfaces of each lens in this embodiment are shown in Table 3-2.

[0108] Table 3-1

[0109]

[0110] Table 3-2

[0111] 32a 32b 34a 34b 35a 35b 36a 36b K -2.03E+00 -1.41E+00 -2.69E+00 6.44E-02 -5.65E-02 -7.39E+01 1.59E-01 -7.75E+00 A4 -1.49E-02 1.43E-01 -3.44E-02 -1.08E-01 -7.39E-02 -5.56E-02 -9.23E-02 -2.34E-02 A6 -5.99E-04 -4.84E-02 -1.34E-01 -9.28E-03 2.32E-01 1.33E-01 3.69E-02 3.20E-02 A8 4.16E-05 -2.02E-03 -1.18E-01 -9.98E-03 2.31E-01 -4.13E-02 -1.88E-02 -2.13E-02 A10 2.32E-05 3.34E-03 -5.94E-01 -5.59E-02 -6.27E-01 -6.50E-02 -6.80E-04 3.84E-03 A12 2.18E-07 5.36E-04 -3.16E+00 -8.63E-01 -1.58E+00 8.52E-03 1.55E-03 -1.01E-04 A14 -9.67E-08 -2.61E-04 -4.70E+00 -2.59E+00 1.14E+00 5.91E-02 7.32E-04 -2.26E-05 A16 -5.12E-08 -5.79E-05 1.40E+01 4.47E+00 2.02E+00 -4.04E-02 -4.99E-04 1.40E-05

[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 day and night confocal fisheye optical lens assembly for vehicle, characterized in that: It includes six lenses, which successively include from the object side to the image side: A first lens (11) with negative optical power, the object side surface of the first lens (11) is convex near the optical axis, and the image side surface of the first lens (11) is concave near the optical axis; A second lens (12) with negative optical power, the object side surface of the second lens (12) is convex near the optical axis, and the image side surface of the second lens (12) is concave near the optical axis; A third lens (13) with positive optical power, the object side surface of the third lens (13) is convex near the optical axis, and the image side surface of the third lens (13) is convex near the optical axis; A diaphragm (10); A fourth lens (14) with positive optical power, the object side surface of the fourth lens (14) is convex near the optical axis, and the image side surface of the fourth lens (14) is convex near the optical axis; A fifth lens (15) with negative optical power, the object side surface of the fifth lens (15) is concave near the optical axis, and the image side surface of the fifth lens (15) is convex near the optical axis; A sixth lens (16) with positive optical power, the object side surface of the sixth lens (16) is convex near the optical axis, and the image side surface of the sixth lens (16) is convex near the optical axis; The optical lens group satisfies the following conditional expressions: -21 < R3 / f2 < -1; where f2 is the focal length of the second lens (12), and R3 is the curvature radius of the object side of the second lens (12); -184 < R10 / CT5 < -15; where R10 is the curvature radius of the image side of the fifth lens (15), and CT5 is the thickness of the fifth lens (15); 0.8 < R7 / f3 < 1.2; where R7 is the curvature radius of the object side of the fourth lens (14), and f3 is the focal length of the third lens (13).

2. A day and night confocal fisheye optical lens assembly for vehicle, characterized in that: It includes six lenses, which successively include from the object side to the image side: A first lens (11) with negative optical power, the object side surface of the first lens (11) is convex near the optical axis, and the image side surface of the first lens (11) is concave near the optical axis; A second lens (12) with negative optical power, the object side surface of the second lens (12) is convex near the optical axis, and the image side surface of the second lens (12) is concave near the optical axis; A third lens (13) with positive optical power, the object side surface of the third lens (13) is convex near the optical axis, and the image side surface of the third lens (13) is convex near the optical axis; A diaphragm (10); A fourth lens (14) with positive optical power, the object side surface of the fourth lens (14) is convex near the optical axis, and the image side surface of the fourth lens (14) is convex near the optical axis; A fifth lens (15) with negative optical power, the object side surface of the fifth lens (15) is concave near the optical axis, and the image side surface of the fifth lens (15) is convex near the optical axis; A sixth lens (16) with positive optical power, the object side surface of the sixth lens (16) is convex near the optical axis, and the image side surface of the sixth lens (16) is convex near the optical axis; The optical lens group satisfies the following conditional expressions: -21 < R3 / f2 < -1, where f2 is the focal length of the second lens (12), and R3 is the curvature radius of the object side of the second lens (12); 1.5 < (R3 - R4) / EFL < 34, where R4 is the curvature radius of the image side of the second lens (12), and EFL is the effective focal length of the optical lens group; -0.1 < (CT2 - CT1) / AT12 < 0.2, where CT2 is the thickness of the second lens (12), CT1 is the thickness of the first lens (11), and AT12 is the air gap between the first lens (11) and the second lens (12); 3. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 4 < (R11 - R12) / EFL < 18.5, where EFL is the effective focal length of the optical lens group, R11 is the curvature radius of the object side of the sixth lens (16), and R12 is the curvature radius of the image side of the sixth lens (16); -5.5 < R12 / f6 < -1.5, where R12 is the curvature radius of the image side of the sixth lens (16), and f6 is the focal length of the sixth lens (16); 4. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 4 < R10 / f5 < 38, where R10 is the curvature radius of the image side of the fifth lens (15), and f5 is the focal length of the fifth lens (15); 5. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: -18.5 < R12 / CT6 < -1.5, where R12 is the curvature radius of the image side of the sixth lens (16), and CT6 is the thickness of the sixth lens (16); 17 < Imgh * TTL < 51, where Imgh is the maximum image height of the imaging height of the optical lens group, and TTL is the total lens length of the optical lens group; 6. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 34 < HFOV / Imgh < 57, where HFOV is half of the maximum field of view angle of the optical lens group, and Imgh is the maximum image height of the imaging height of the optical lens group; 7. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 7 < (CT3 + CT4) / AT34 < 23, where CT3 is the thickness of the third lens (13), CT4 is the thickness of the fourth lens (14), and AT34 is the air gap between the third lens (13) and the fourth lens (14); -3 < (CT5 - CT6) / AT56 < -0.8, where CT5 is the thickness of the fifth lens (15), CT6 is the thickness of the sixth lens (16), and AT56 is the air gap between the fifth lens (15) and the sixth lens (16); 8. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 0.5 < AT56 / Imgh < 2.6, where AT56 is the air gap between the fifth lens (15) and the sixth lens (16), and Imgh is the maximum image height of the imaging height of the optical lens group; 9. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 9.5 < TTL / EFL < 12, where TTL is the total lens length of the optical lens group, and EFL is the effective focal length of the optical lens group.

10. The day and night confocal fisheye optical lens assembly for vehicle according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 2 < f6 / EFL < 3.5; where f6 is the focal length of the sixth lens (16), and EFL is the effective focal length of the optical lens group.

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