A confocal fisheye optical lens assembly for vehicles

Abstract

The present invention provides a vehicle-mounted day-night confocal fish-eye optical lens group, which includes six lenses. In sequence from the object side to the image side, it includes: a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, an aperture, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and 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 formulas: -21 < R3 / f2 < -1; -184 < R10 / CT5 < -15; 0.8 < R7 / f < 1.2; It can adjust the light-receiving ability, increase the lens field angle, reduce the imaging aberration, shorten the back focal length, and improve the imaging quality.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, specifically to a confocal fisheye optical lens assembly for automotive use. Background Technology

[0002] A day / night confocal fisheye lens is a special type of optical lens that combines ultra-wide-angle and day / night confocal capabilities. It maintains a consistent focus under varying lighting conditions, making it suitable for all-weather monitoring and other applications requiring wide-area, blind-spot-free imaging, such as scene surveillance, medical endoscopy, drone photography, and engineering surveying. Particularly in security systems, day / night confocal fisheye lenses offer a wide field of view and clear images, maintaining excellent monitoring performance day and night. The design of a day / night confocal fisheye lens typically includes multiple lenses arranged in a specific order to optimize light propagation and focusing capabilities. For example, one design might include nine lenses, each with a specific power and shape, to achieve advantages such as a large aperture, 4K ultra-high-definition resolution, low temperature drift, and day / night confocal focus. With technological advancements, continuously improving the image quality of day / night confocal fisheye lenses and reducing the size of the lens system are pressing issues for engineers in the industry. Summary of the Invention

[0003] To address the above problems, this invention provides a confocal fisheye optical lens assembly for vehicles, which can adjust light collection capability, increase lens field of view, reduce imaging aberrations, shorten back focal length, and improve image quality.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a confocal fisheye optical lens assembly for vehicles, comprising six lenses, which, from the object side to the image side, sequentially include: a first lens with negative optical power, wherein the object side of the first lens is convex near the optical axis and the image side of the first lens is concave near the optical axis; a second lens with negative optical power, wherein the object side of the second lens is convex near the optical axis and the image side of the second lens is concave near the optical axis; and a third lens with positive optical power, wherein the object side of the third lens is convex near the optical axis. The optical lens group comprises: a third lens with a convex surface near the optical axis on its image side; an aperture; a fourth lens with positive optical power, wherein both its object side and image side are convex near the optical axis; a fifth lens with negative optical power, wherein both its object side and image side are concave near the optical axis on its image side; and a sixth lens with positive optical power, wherein both its object side and image side are convex near the optical axis on its image side. The optical lens group satisfies the following condition:

[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 and night confocal fish-eye optical lens group, including six lenses, which successively include 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 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:​​​​​​​​​​​1. Satisfy the conditional expression -21 < R3 / f2 < -1, 0.8 < R7 / f3 < 1.2, adjust the light-gathering ability to increase the lens field angle;

[0025] 2. Satisfy the conditional expression -184 < R10 / CT5 < -15, which is beneficial for correcting chromatic aberration and can also adjust the lens volume;

[0026] 3. Satisfy the conditional expression 1.5 < (R3 - R4) / EFL < 34, which helps to control the intensity configuration of the appropriate lens shape and refractive power of the second lens, can avoid excessive change in the refractive power of the image-side end lens, is beneficial for 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 expression -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 for lens assembly;

[0028] 5. Satisfy the conditional expression 4 < (R11 - R12) / EFL < 18.5, which is more beneficial for adjusting the lens shape and the intensity 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 expression 4 < R10 / f5 < 38, which is beneficial for adjusting the lens focal length, and at the same time, is beneficial for correcting chromatic aberration and achieving the visibility of visible light and infrared light;

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

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

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

[0033] 10. Satisfy the conditional expression 7 < (CT3 + CT4) / AT34 < 23, which makes 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 an appropriate distance between the third lens and the fourth lens to correct off-axis image aberrations such as image bending;

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

[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. Through a reasonable design of 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, allowing the light to enter at a relatively gentle angle. A small incident angle 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. [[ID=​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ Figure 10 This refers to the longitudinal chromatic aberration of the optical lens group in Example 2.

[0049] Figure 11 This is a schematic diagram of the optical lens assembly in Example 3.

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

[0051] Figure 13 This is a field curve diagram of the optical lens group in Example 3.

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

[0053] Figure 15 This refers to the longitudinal chromatic aberration of the optical lens group in Example 3.

[0054] The attached figures are labeled as follows: first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, filter element 17, electronic photosensitive element 18, and aperture 10. Detailed Implementation

[0055] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0056] This invention discloses a solution achieved through the following technical method: a confocal fisheye optical lens assembly for vehicles, comprising six lenses, which, from the object side to the image side, sequentially include: a first lens 11 with negative optical power, wherein the object side of the first lens 11 is convex near the optical axis and the image side of the first lens 11 is concave near the optical axis; a second lens 12 with negative optical power, wherein the object side of the second lens 12 is convex near the optical axis and the image side of the second lens 12 is concave near the optical axis; and a third lens 13 with positive optical power, wherein the object side of the third lens 13 is convex near the optical axis and the image side of the third lens 13 is convex near the optical axis; and an aperture. 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; a filter element 17 that does not affect the focal length and an electronic photosensitive element 18 are also sequentially arranged between the sixth lens 16 and the image side; the optical lens group satisfies the following condition:

[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 adjusts the light-gathering ability and increases the lens field angle.

[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 helps correct chromatic aberration and can adjust the lens volume at the same time.

[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 adjusts the light-gathering ability and increases the lens field angle.

[0060] The present invention provides another vehicle daytime and nighttime co-focusing fish-eye optical lens group, which includes six lenses. From the object side to the image side, they are successively: 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 meets 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 adjusts the light-gathering ability and increases the lens field angle.

[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 control the second lens to have an appropriate lens shape and refractive power intensity 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 is also 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 is conducive to miniaturizing the camera lens system to avoid an overly large volume of the camera system, making the camera 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 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 and fourth lenses within an appropriate range to correct the aberration generated by the second lens, and provides an appropriate spacing between the third and fourth lenses 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 and sixth lenses within an appropriate range to correct the aberration generated by the fourth lens, and provides an appropriate spacing between the fifth and sixth lenses 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 enter at a relatively gentle angle. A small-angle incidence can effectively reduce the aberrations caused by subsequent lenses.

[0081] Example 1, such as Figure 1-5 As shown, the first lens 11 and the third lens 13 are made of glass, while 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 confocal fisheye optical lens group for automotive use, and the relevant parameters of each lens are shown in Table 1-1. 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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0088]

[0089] Where X: the distance between the point on the aspherical surface that is Y away from the optical axis and the tangent plane between the aspherical surface and the optical axis;

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

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

[0092] K: Conical coefficient;

[0093] A i : The i-th order aspherical coefficient.

[0094] Example 2, as Figure 6-10 As shown, the first lens 11 and the third lens 13 are made of glass, while 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 confocal fisheye optical lens group for automotive use, 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.

[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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0101]

[0102] Where X: the distance between the point on the aspherical surface that is Y away from the optical axis and the tangent plane between the aspherical surface and the optical axis;

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

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

[0105] K: Conical coefficient;

[0106] A i : The i-th order aspherical coefficient.

[0107] Example 3, as Figure 11-15 As shown, the first lens 11 and the third lens 13 are made of glass, while 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 confocal fisheye optical lens group for automotive use, 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.

[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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0113]

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

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

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

[0117] K: Conical coefficient;

[0118] A i : The i-th order aspherical coefficient.

[0119] The above embodiments illustrate only three implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A confocal fisheye optical lens assembly for automotive use, characterized in that, It consists of six lenses, which successively include from the object side to the image side: The first lens (11) with a negative focal 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; The second lens (12) with a negative focal 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; The third lens (13) with a positive focal 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; The aperture (10); The fourth lens (14) with a 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; The fifth lens (15) with a 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 (1�) is convex near the optical axis; The sixth lens (16) with a 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; The optical lens group satisfies the following conditional formulas: -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); 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); -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.

2. A confocal fisheye optical lens assembly for automotive use, characterized in that, It consists of six lenses, which successively include from the object side to the image side: The first lens (11) with a negative focal 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; The second lens (12) with a negative focal 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 of the third lens (13) is convex near the optical axis, and the image side of the third lens (13) is convex near the optical axis; An aperture (10); A fourth lens (14) with positive optical power, the object side of the fourth lens (14) is convex near the optical axis, and the image side of the fourth lens (14) is convex near the optical axis; A fifth lens (15) with negative optical power, the object side of the fifth lens (15) is concave near the optical axis, and the image side of the fifth lens (15) is convex near the optical axis; A sixth lens (16) with positive optical power, the object side of the sixth lens (16) is convex near the optical axis, and the image side 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); 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); -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.

3. A confocal fisheye optical lens assembly for vehicles according to claim 1 or 2, characterized in that, The optical lens group satisfies the following condition: 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).

4. A confocal fisheye optical lens assembly for vehicles 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 angle of view of the optical lens group, and Imgh is the maximum image height of the imaging height of the optical lens group.

5. A confocal fisheye optical lens assembly for vehicles 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).

6. A confocal fisheye optical lens assembly for vehicles 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.

7. A confocal fisheye optical lens assembly for vehicles 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.

8. A confocal fisheye optical lens assembly for vehicles 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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