Ultra-wide-angle automobile application look-around optical imaging lens

Abstract

The invention provides an ultra-wide-angle automobile application look-around optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, an optical filter, protective glass and an image plane from an object plane to an image plane along an optical axis. The ultra-wide angle design is adopted, the lens angle reaches 207 degrees, the driving view field is greatly widened, the athermalization design is adopted, thermal temperature drift compensation is achieved, the working temperature can range from-40 DEG C to 105 DEG C, and the application of the product in high-temperature, low-temperature and other complex temperature scenes is improved; the EP8000 / T62R / F3500 plastic material with a high Tg value is selected when the material of the lens is selected, so that the high and low temperature working reliability of the lens is ensured; the high-temperature MTF attenuation sensitive lens is designed to be away from the inner wall of the lens cone, so that MTF attenuation caused by surface variation due to extrusion of the high-temperature plastic lens and the lens cone is avoided, and the definition of the lens in a complex high-temperature environment is ensured; the purple edge is optimized through matching of the spherical surface and the aspheric surface, and the image quality of lens imaging is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and particularly to an ultra-wide-angle automotive application panoramic optical imaging lens. Background Art

[0002] In traditional reverse imaging systems, a camera is only installed at the rear of the vehicle, leaving blind spots around the vehicle and in the front, increasing safety hazards and making it easy to have collision and scraping incidents in narrow and congested urban areas and parking lots. To expand the driver's field of vision and reduce the line of sight blind spots, a technology that can sense the 360° omnidirectional environment is needed, and automotive panoramic lenses have emerged. A panoramic lens system usually consists of multiple cameras distributed in different positions of the front, rear, left, and right of the vehicle. Through advanced image processing algorithms, the images collected by these cameras can be quickly processed, stitched, and fused. Finally, on the display screen in the driver's seat of the vehicle, a clear and intuitive panoramic bird's-eye view of the vehicle's surroundings is presented to the driver. With the help of this panoramic image, the driver can clearly check whether there are obstacles in all corners around the vehicle, accurately understand the orientation and distance of the obstacles relative to the vehicle, and then make reasonable driving decisions in advance, effectively reducing the occurrence of various accidents and significantly improving driving safety and comfort.

[0003] However, most of the current panoramic lenses have the following problems: the field of view angle is not large enough, the captured image by the lens is limited, and it cannot provide a better panoramic bird's-eye view for the driver. Summary of the Invention

[0004] The present invention proposes an ultra-wide-angle automotive application panoramic optical imaging lens, which combines the characteristics of ultra-wide angle, athermalization, eliminating the MTF attenuation caused by the surface shape variation due to the extrusion of high-temperature plastic lenses and the lens barrel, using plastic lens materials with a high Tg point, and purple fringing optimization.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an ultra-wide-angle automotive application panoramic optical imaging lens, which sequentially includes, along the optical axis from the object plane to the image plane: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a filter, a protective glass, and an image plane; The first lens of the optical imaging lens is a meniscus lens with a negative optical power; the second lens is a concave-convex lens with a negative optical power; the third lens is a biconvex lens with a positive optical power; the fourth lens is a biconvex lens with a positive optical power; the fifth lens is a concave-convex lens with a negative optical power; the sixth lens is a biconvex lens with a positive optical power; Wherein, the ratio of the focal lengths of the first lens to the sixth lens of the optical imaging lens to the focal length of the optical imaging lens satisfies the following set relationship: -6.1 < f1 / f < -5.1, -2.8 < f2 / f < -1.9, 3.9 < f3 / f < 5.1, 26.3 < f4 / f < 27.1, -8.9 < f5 / f < -7.8, 2.3 < f6 / f < 3.2; where f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, and f represents the effective focal length of the optical imaging lens.

[0006] A further solution is that the combined focal length f1&2 of the first lens and the second lens of the optical imaging lens and the focal length f6 of the sixth lens satisfy: -3.1 < f6 / f1&2 < -2.0. A further solution is that the refractive indices of the first lens to the sixth lens satisfy the following conditions: 1.80 < n1 < 1.91; 1.45 < n2 < 1.56; 1.80 < n3 < 1.89; 1.52 < n4 < 1.63; 1.63 < n5 < 1.72; 1.52 < n6 < 1.61; where n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.

[0007] A further solution is that the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 of the optical imaging lens are all made of the EP8000 / T62R / F3500 plastic material with a high Tg value (glass transition temperature).

[0008] A further solution is that the fifth lens is sensitive to high-temperature MTF attenuation, and an avoidance structure is provided between the fifth lens and the inner wall of the lens barrel.

[0009] A further solution is that the first lens and the third lens are made of glass material, and the second lens, the fourth lens, the fifth lens, and the sixth lens are made of plastic material.

[0010] A further solution is that the aperture of the optical imaging lens satisfies the following condition: F / NO = 2.0.

[0011] A further solution is that the effective focal length f of the optical imaging lens satisfies the following condition: 1.25 mm ≤ f ≤ 1.55 mm.

[0012] A further solution is that the aperture stop ST0 of the optical imaging lens is arranged between the third lens E3 and the fourth lens E4.

[0013] In a further solution, the surface of the first lens facing the object side is convex, and the surface facing the image side is concave; the surface of the second lens facing the object side is convex, and the surface facing the image side is concave; the surface of the third lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the radius of curvature of the surface of the third lens facing the object side is less than the absolute value of the radius of curvature of the surface of the third lens facing the image side; the surface of the fourth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the radius of curvature of the surface of the fourth lens facing the object side is greater than the absolute value of the radius of curvature of the surface of the fourth lens facing the image side; the surface of the fifth lens facing the object side is concave, and the surface facing the image side is convex; the surface of the sixth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the radius of curvature of the surface of the sixth lens facing the object side is less than the absolute value of the radius of curvature of the surface of the sixth lens facing the image side.

[0014] In summary, the present invention has the following beneficial effects: The present invention provides an ultra-wide-angle automotive application panoramic optical imaging lens, especially an automotive application panoramic optical imaging lens that takes into account ultra-wide angle, athermalization, and purple edge optimization. The lens includes a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a filter, a protective glass, and an image plane arranged in the direction from the object side to the image side. The present invention adopts an ultra-wide-angle design, and the lens angle reaches 207 degrees, greatly broadening the driving vision. The athermalization design is adopted during the design to achieve thermal drift compensation, and the operating temperature can range from -40°C to 105°C, improving the application of the product in complex temperature scenarios such as high temperature and low temperature; when selecting the lens material, the EP8000 / T62R / F3500 plastic material with a high Tg value is selected to ensure the reliability of the lens at high and low temperatures; in the structural design, a new design process is adopted to avoid the high-temperature MTF attenuation-sensitive lens from the inner wall of the lens barrel, preventing the surface shape variation caused by the extrusion of the high-temperature plastic lens and the lens barrel, which leads to MTF attenuation, and ensuring the clarity of the lens in a complex high-temperature environment; the spherical and aspherical combination design is adopted to optimize the purple edge and improve the imaging quality of the lens. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the optical imaging lens provided by the embodiment of the present invention; Figure 2 It is an MTF analysis diagram of the optical imaging lens provided by the embodiment of the present invention at 20°C in visible light; Figure 3 It is a defocus curve diagram of the optical imaging lens provided by the embodiment of the present invention at 20°C in visible light; Figure 4 It is a defocus curve diagram of the optical imaging lens provided by the embodiment of the present invention at -40°C in visible light; Figure 5Defocus curve diagram of the optical imaging lens provided by the embodiment of the present invention at 105°C in visible light; Figure 6 F-THETA distortion diagram of the optical imaging lens provided by the embodiment of the present invention; Figure 7 Structural design sectional view of the optical imaging lens provided by the embodiment of the present invention; Figure 8 Field curvature diagram of the optical imaging lens provided by the embodiment of the present invention in visible light; Figure 9 Standard spot diagram of the optical imaging lens provided by the embodiment of the present invention in visible light.

[0016] Figure 10 Vertical chromatic aberration diagram of the optical imaging lens provided by the embodiment of the present invention at wavelengths of 435 - 656nm. Detailed implementation manners

[0017] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0020] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] As Figure 1 shown, the present invention provides an ultra-wide-angle automotive application panoramic optical imaging lens, which includes a first lens E1, a second lens E2, a third lens E3, a diaphragm ST0, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter IR, a protective glass CG and an image plane IMA arranged in the direction from the object side to the image side. Among them, the first lens E1 and the third lens E3 are glass lenses, and the others are plastic lenses.

[0022] Specifically, the first lens is a meniscus lens with a negative optical power; the second lens is a concave-convex lens with a negative optical power; the third lens is a biconvex lens with a positive optical power; the fourth lens is a biconvex lens with a positive optical power; the fifth lens is a concave-convex lens with a negative optical power; the sixth lens is a biconvex lens with a positive optical power; wherein, the ratio of the focal lengths of the first lens E1 to the sixth lens E6 to the focal length of the optical imaging lens satisfies the following set relationship: -6.1 < f1 / f < -5.1, -2.8 < f2 / f < -1.9, 3.9 < f3 / f < 5.1, 26.3 < f4 / f < 27.1, -8.9 < f5 / f < -7.8, 2.3 < f6 / f < 3.2; where f1 represents the effective focal length of the first lens E1, f2 represents the effective focal length of the second lens E2, f3 represents the effective focal length of the third lens E3, f4 represents the effective focal length of the fourth lens E4, f5 represents the effective focal length of the fifth lens E5, f6 represents the effective focal length of the sixth lens E6, and f represents the effective focal length of the optical imaging lens. Satisfying the above range can reasonably allocate the focal lengths of each lens and improve the imaging quality; at the same time, the first lens E1 and the second lens E2 have appropriate negative optical powers, which is beneficial to the entry of large-angle light into the optical lens and makes the field of view angle of the optical lens larger.

[0023] A further solution is that the combined focal length f1&2 of the first lens and the second lens of the optical imaging lens and the focal length f6 of the sixth lens satisfy: -3.1 < f6 / f1&2 < -2.0. Meeting the above range can correct aberration and focus light when large-angle light passes through the sixth lens E6, balance spherical aberration, field curvature, and chromatic aberration, suppress distortion, and improve the imaging quality of the lens.

[0024] A further solution is that the refractive indices of the first lens to the sixth lens of the optical imaging lens satisfy the following conditions: 1.80 < n1 < 1.91; 1.45 < n2 < 1.56; 1.80 < n3 < 1.89; 1.52 < n4 < 1.63; 1.63 < n5 < 1.72; 1.52 < n6 < 1.61; where n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens. Meeting the above range and reasonably selecting the lens material, the first lens E1 and the third lens E3 use high-refractive-index glass. The incident angle of light in the edge field of view of the ultra-wide-angle lens is relatively large. The high-refractive-index material can reduce the light deflection angle, reduce vignetting, and reduce the occlusion loss of edge light, making the resolution and contrast of the edge field of view closer to the central area and improving the imaging quality.

[0025] Preferably, to solve the problem that the imaging of the optical imaging lens is unstable in high and low temperature environments, the imaging quality deteriorates when the temperature is too high or too low, and it cannot provide a better peripheral vision for the driver. The second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 of the optical imaging lens are all made of EP8000 / T62R / F3500 plastic material with a high Tg value (glass transition temperature). When the temperature is lower than the Tg value, the material remains rigid; when the temperature is higher than the Tg value, the material gradually softens and may deform; the higher the Tg value, the less likely the lens is to deform in a high-temperature environment. Using materials with a high Tg value for the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 can ensure the reliability of the lens when working at high and low temperatures.

[0026] Preferably, the optical imaging lens adopts a new design process in structure, and an avoidance structure is provided between the fifth lens E5, which is sensitive to high-temperature MTF attenuation, and the inner wall of the lens barrel, avoiding the fifth lens E5, which is sensitive to high-temperature MTF attenuation, from the inner wall of the lens barrel. Due to the difference in the thermal expansion coefficients of plastic and metal, avoiding the high-temperature MTF attenuation-sensitive lens from the inner wall of the lens barrel can prevent the MTF attenuation caused by the surface shape variation due to the extrusion of the high-temperature plastic lens and the lens barrel, ensuring the clarity of the lens in a complex high-temperature environment.

[0027] Preferably, the optical imaging lens adopts a 2G + 4P design. Specifically, the first lens E1 and the third lens E3 are made of glass, and the second lens E2, the fourth lens E4, the fifth lens E5, and the sixth lens E6 are all made of plastic. The combination of glass and plastic optimizes the compensation for temperature drift of the optical imaging lens at high and low temperatures, ensuring the stability of the imaging effect when the lens works at high and low temperatures; 4 aspheric plastic lenses are used. Aspheric lenses can better control the refraction and focusing of light, reduce aberration and chromatic aberration, especially the purple fringing phenomenon at the edge, and improve the imaging quality and resolution.

[0028] Preferably, in the above optical imaging lens provided by the embodiment of the present invention, the aperture of the optical imaging lens satisfies the following condition: F / NO = 2.0.

[0029] Preferably, in the above optical imaging lens provided by the embodiment of the present invention, the effective focal length f of the optical imaging lens satisfies the following condition: 1.25 mm ≤ f ≤ 1.55 mm.

[0030] Preferably, in the above optical imaging lens provided by the embodiment of the present invention, the aperture stop ST0 of the optical imaging lens is arranged between the third lens E3 and the fourth lens E4.

[0031] Preferably, the surface of the first lens facing the object side is convex, and the surface facing the image side is concave; the surface of the second lens facing the object side is convex, and the surface facing the image side is concave; the surface of the third lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the curvature radius of the surface of the third lens facing the object side is less than the absolute value of the curvature radius of the surface of the third lens facing the image side; the surface of the fourth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the curvature radius of the surface of the fourth lens facing the object side is greater than the absolute value of the curvature radius of the surface of the fourth lens facing the image side; the surface of the fifth lens facing the object side is concave, and the surface facing the image side is convex; the surface of the sixth lens facing the object side is convex, and the surface facing the image side is convex, and the absolute value of the curvature radius of the surface of the sixth lens facing the object side is less than the absolute value of the curvature radius of the surface of the sixth lens facing the image side.

[0032] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0033] Among them, the parameters of each lens in this embodiment are listed in Table 1 below, and the aspheric coefficients of the lenses are shown in Table 2 below.

[0034] Table 1 Physical parameters of each lens

[0035] Table 2 Aspherical Coefficients of the Lens

[0036] The aspherical coefficients satisfy the following equation:

[0037] Where z is the aspherical sag, c is the aspherical paraxial curvature, y is the lens aperture, k is the conic constant, a4 is the 4th-order aspherical coefficient, a6 is the 6th-order aspherical coefficient, a8 is the 8th-order aspherical coefficient, a10 is the 10th-order aspherical coefficient, a12 is the 12th-order aspherical coefficient, a14 is the 14th-order aspherical coefficient, and a16 is the 16th-order aspherical coefficient.

[0038] Specifically, in this embodiment, the R values and thicknesses of the surfaces of each lens are shown in Table 1, and the aspherical parameters are shown in Table 2.

[0039] Specifically, in this embodiment, the R values (Radius of Curvature), thicknesses (Thickness), refractive indices (Index), Abbe numbers (ABB), and effective focal lengths of the lenses (EFL-E) of the surfaces of each lens are shown in Table 1, and the aspherical parameters are shown in Table 2. In Table 1, Surf represents the mirror surface number, InFInITY represents infinity. In Table 2, R1 represents the radius of curvature of the surface of the corresponding lens facing the object side, and R2 represents the radius of curvature of the surface of the corresponding lens facing the image side. A positive radius of curvature indicates that the mirror surface is curved towards the object surface side, and a negative radius of curvature indicates that the mirror surface is curved towards the image surface side.

[0040] Among them, the effective focal length of the optical imaging lens provided in Table 1 is 1.33 mm, the maximum full image height is 5.7 mm, and the aperture F / NO is 2.0. In Table 1, mirror surface numbers 1 and 2 successively represent the two mirror surfaces of the first lens E1 along the light incident direction, mirror surface numbers 3 and 4 successively represent the two mirror surfaces of the second lens E2 along the light incident direction, mirror surface numbers 5 and 6 successively represent the two mirror surfaces of the third lens E3 along the light incident direction, mirror surface number 8 represents the mirror surface of the fourth lens E4 facing the object side, mirror surface number 9 represents the cemented surface of the fourth lens E4 and the fifth lens E5, mirror surface number 10 represents the mirror surface of the fifth lens E5 facing the image side, and mirror surface numbers 11 and 12 successively represent the two mirror surfaces of the sixth lens E5 along the light incident direction.

[0041] In the embodiment of the present invention, Figure 2It is a modulation transfer function (MTF) curve graph in the visible light band, representing the comprehensive resolution ability of the optical system. The horizontal axis in the graph represents the spatial frequency, unit: cycles per millimeter (cycles / mm), and the vertical axis represents the value of the modulation transfer function (MTF). The value of MTF is used to evaluate the imaging quality of the lens, and the value range is 0 - 1. It should be particularly noted that the optical transfer function is a relatively accurate, intuitive, and common way to evaluate the imaging quality of an optical system. The higher and smoother its curve is, the better the imaging quality of the system and the stronger the ability to restore the real image; From Figure 2 it can be seen that in the imaging area near the center in the visible light band, MTF > 0.7, and the imaging quality is good. From Figure 3 the defocus curve graph, it can be seen that the MTF concentration of this lens is good, which is convenient for focusing. From Figure 4 And Figure 5 it can be seen that the defocus curves at high temperature and low temperature both meet high resolution, the change amount of the defocus curve focus is small, and there is no defocus in high and low temperature environments; Figure 6 It is shown as an F-THETA distortion graph. The smaller the F-THETA distortion is, the smaller the compression amount of the imaging picture edge is; Figure 7 It is shown as a sectional view of the optical lens structure design. From Figure 7 it can be known that the fifth lens E5 is designed to avoid the inner wall of the lens barrel. The lens sensitive to the attenuation of high-temperature MTF is avoided from the inner wall of the lens barrel, which can prevent the surface shape variation caused by the extrusion of the high-temperature plastic lens and the lens barrel, resulting in MTF attenuation, and ensure the clarity of the lens in a complex high-temperature environment; From Figure 8 it can be known that the field curvature value is controlled between -0.065mm and 0.065mm. The smaller the field curvature value is, the better the imaging quality of the lens; Figure 9 It is the standard spot diagram of the visible light wavelength in the invention embodiment; Figure 10 It is shown as a lateral chromatic aberration graph. The smaller the lateral chromatic aberration is, the better the color restoration degree of the imaging picture and the better the purple edge optimization.

Claims

1. An ultra-wide-angle automotive surround-view optical imaging lens, characterized in that: Along the optical axis from the object plane to the image plane, it successively includes: a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a filter, a protective glass and an image plane; The first lens is a meniscus lens with a negative optical power; the second lens is a concave-convex lens with a negative optical power; the third lens is a biconvex lens with a positive optical power; the fourth lens is a biconvex lens with a positive optical power; the fifth lens is a concave-convex lens with a negative optical power; the sixth lens is a biconvex lens with a positive optical power; Wherein, the ratio of the focal lengths of the first lens to the sixth lens to the focal length of the optical imaging lens satisfies the following set relationship: -6.1 < f1 / f < -5.1, -2.8 < f2 / f < -1.9, 3.9 < f3 / f < 5.1, 26.3 < f4 / f < 27.1, -8.9 < f5 / f < -7.8, 2.3 < f6 / f < 3.2; where f1 represents the effective focal length of the first lens, f2 represents the effective focal length of the second lens, f3 represents the effective focal length of the third lens, f4 represents the effective focal length of the fourth lens, f5 represents the effective focal length of the fifth lens, f6 represents the effective focal length of the sixth lens, and f represents the effective focal length of the optical imaging lens.

2. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The combined focal length f1&2 of the first lens and the second lens of the optical imaging lens and the focal length f6 of the sixth lens satisfy: -3.1 < f6 / f1&2 < -2.

0.

3. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The refractive indices of the first lens to the sixth lens satisfy the following conditions: 1.80 < n1 < 1.91; 1.45 < n2 < 1.56; 1.80 < n3 < 1.89; 1.52 < n4 < 1.63; 1.63 < n5 < 1.72; 1.52 < n6 < 1.61; where n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.

4. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The second lens E2, the fourth lens E4, the fifth lens E5 and the sixth lens E6 of the optical imaging lens are all made of EP8000 / T62R / F3500 plastic material with a high Tg value.

5. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The fifth lens is sensitive to the attenuation of high-temperature MTF, and an avoidance structure is provided between the fifth lens and the inner wall of the lens barrel.

6. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The first lens and the third lens are both made of glass material, and the second lens, the fourth lens, the fifth lens and the sixth lens are all made of plastic material.

7. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The aperture of the optical imaging lens satisfies the following condition: F / NO = 2.

0.

8. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The effective focal length f of the optical imaging lens satisfies the following condition: 1.25 mm ≤ f ≤ 1.55 mm.

9. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The diaphragm ST0 of the optical imaging lens is arranged between the third lens and the fourth lens.

10. The ultra-wide-angle surround optical imaging lens for automotive applications according to claim 1, characterized in that: The first lens has a convex surface facing the object side, and a concave surface facing the image side; the second lens has a convex surface facing the object side, and a concave surface facing the image side; the third lens has a convex surface facing the object side, and a convex surface facing the image side, and the absolute value of the radius of curvature of the surface of the third lens facing the object side is smaller than the absolute value of the radius of curvature of the surface of the third lens facing the image side; the fourth lens has a convex surface facing the object side, and a convex surface facing the image side, and the absolute value of the radius of curvature of the surface of the fourth lens facing the object side is larger than the absolute value of the radius of curvature of the surface of the fourth lens facing the image side; the fifth lens has a concave surface facing the object side, and a convex surface facing the image side; the sixth lens has a convex surface facing the object side, and a convex surface facing the image side, and the absolute value of the radius of curvature of the surface of the sixth lens facing the object side is smaller than the absolute value of the radius of curvature of the surface of the sixth lens facing the image side.

Images