Large-aperture large-target-surface vehicle-mounted wide-angle lens and imaging method thereof

Abstract

The invention relates to a large-aperture large-target-surface vehicle-mounted wide-angle lens and an imaging method thereof. The large-aperture large-target-surface vehicle-mounted wide-angle lens comprises an optical system, and the optical system is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from left to right along a light incident light path. By reasonably distributing the focal power and the surface type of each lens, the center thickness of each lens, the axial distance between the lenses and the like, the lens can be matched with a large-target-surface chip for high-definition imaging, the visual range is wide, and the field angle reaches 100 degrees or above. By adopting a glass-plastic mixed structure, the lens is low in cost, has the advantages of large aperture and low temperature drift, and can realize clear imaging in a range from-40 DEG C to 95 DEG C.

Description

Technical Field

[0001] This invention relates to a large-aperture, large-area vehicle-mounted wide-angle lens and its imaging method. Background Technology

[0002] With the rapid development of intelligent vehicles and advanced driver assistance systems (ADAS), automotive camera lenses are gaining popularity in the market, with demand increasing daily and huge development potential. Currently, most automotive lenses on the market have relatively small image heights, generally suitable for small-area chips, and difficult to match with large-area chips. Meanwhile, with the upgrading of ADAS, the technical specifications of automotive lenses, such as aperture, field of view, and image quality, are constantly improving, and existing automotive lenses cannot simultaneously meet these requirements, and their manufacturing costs are relatively high. Therefore, there is an urgent need to develop a wide-angle automotive lens with a large sensor size, large aperture, high resolution, and low cost. Summary of the Invention

[0003] The present invention improves upon the above-mentioned problems. Specifically, the technical problem to be solved by the present invention is to provide a large-aperture, large-surface vehicle-mounted wide-angle lens and its imaging method, which has a large image height, a large field of view, a large light-transmitting aperture, low temperature drift, and no pyrolysis function.

[0004] The present invention is configured as follows: it includes an optical system, which consists of a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from left to right along the incident light path.

[0005] Furthermore, the first lens is a lens capable of negative optical power, with its object-side surface being convex and its image-side surface being concave; the second lens is a meniscus lens capable of positive optical power, with its object-side surface being concave and its image-side surface being convex; the third lens is a meniscus lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave; the fourth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the fifth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the sixth lens is a meniscus lens capable of negative optical power, with its object-side surface being concave and its image-side surface being convex; and the seventh lens is a lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave.

[0006] Furthermore, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively. The ratios of f1, f2, f3, f4, f5, f6, and f7 to f satisfy the following ratio: -2.0 <f1 / f<-1.0,13.0<f2 / f<14.0,59.0<f3 / f<60.0,1.0<f4 / f<2.0,2.0<f5 / f<3.0,-2.0<f6 / f<-1.0,3.0<f7 / f<4.0。

[0007] Furthermore, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0008] Furthermore, the air gap between the first lens and the second lens is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third lens and the fourth lens is 0~0.5mm; the air gap between the fourth lens and the fifth lens is 0~0.5mm; the air gap between the fifth lens and the sixth lens is 0~0.5mm; and the air gap between the sixth lens and the seventh lens is 0~0.5mm.

[0009] Furthermore, the first lens is a lens capable of negative optical power, with its object-side surface being convex and its image-side surface being concave; the second lens is a meniscus lens capable of negative optical power, with its object-side surface being concave and its image-side surface being convex; the third lens is a meniscus lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave; the fourth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the fifth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the sixth lens is a meniscus lens capable of negative optical power, with its object-side surface being concave and its image-side surface being convex; and the seventh lens is a lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave.

[0010] Furthermore, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively. The ratios of f1, f2, f3, f4, f5, f6, and f7 to f satisfy the following ratio: -2.0 <f1 / f<-1.0,-87.0<f2 / f<-86.0,16.0<f3 / f<17.0,1.0<f4 / f<2.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0,4.0<f7 / f<5.0。

[0011] Furthermore, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0012] Furthermore, the air gap between the first lens and the second lens is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third lens and the fourth lens is 0~0.5mm; the air gap between the fourth lens and the fifth lens is 0~0.5mm; the air gap between the fifth lens and the sixth lens is 0~0.5mm; and the air gap between the sixth lens and the seventh lens is 0~0.5mm.

[0013] Furthermore, the second, third, fifth, sixth, and seventh lenses are all aspherical lenses, and the equation for the aspherical curve is expressed as follows: Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0014] Furthermore, in the imaging method of a large-aperture, large-area automotive wide-angle lens, light rays pass sequentially through a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens before forming an image.

[0015] Compared with existing technologies, this invention has the following advantages: This device uses seven lenses, consisting of two glass spherical lenses and five plastic aspherical lenses to form an optical imaging system. By optimizing the surface shape of the lenses and rationally allocating the optical power of each lens, this lens can be used with large-area chips for high-definition imaging, with a field of view exceeding 100 degrees, a wide imaging range, and a large aperture, resulting in good light transmission performance. Furthermore, the use of a glass-plastic hybrid optical system with all refractive index temperature coefficients being negatively correlated results in low cost and achieves heatless operation, ensuring clear imaging within the range of -40℃ to 95℃. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the optical structure of Embodiment 1 of the present invention; Figure 2 This is the defocused MTF curve of Embodiment 1 of the present invention at room temperature; Figure 3 This is the defocused MTF curve of Embodiment 1 of the present invention at a low temperature of -40°C; Figure 4 This is the defocused MTF curve of Embodiment 1 of the present invention at a high temperature of 95°C; Figure 5 This is a schematic diagram of the optical structure of Embodiment 2 of the present invention; Figure 6 This is the defocused MTF curve of Embodiment 2 of the present invention at room temperature; Figure 7 This is the defocused MTF curve of Embodiment 2 of the present invention at a low temperature of -40°C; Figure 8 This is the defocused MTF curve of Embodiment 2 of the present invention at a high temperature of 95°C; In the diagram: STO - aperture stop; L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - seventh lens; L8 - equivalent glass plate; IMA - imaging plane. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1-8 As shown, the present invention provides a large aperture, large target surface area automotive wide-angle lens, including an optical system. The optical system consists of a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged sequentially from left to right along the incident light path. During imaging, the light passes through the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens in sequence before forming an image.

[0019] In Embodiment 1 of the present invention, the first lens is a lens with negative optical power, its object-side surface is convex and its image-side surface is concave; the second lens is a meniscus lens with positive optical power, its object-side surface is concave and its image-side surface is convex; the third lens is a meniscus lens with positive optical power, its object-side surface is convex and its image-side surface is concave; the fourth lens is a biconvex lens with positive optical power, both its object-side and image-side surfaces are convex; the fifth lens is a biconvex lens with positive optical power, both its object-side and image-side surfaces are convex; the sixth lens is a meniscus lens with negative optical power, its object-side surface is concave and its image-side surface is convex; and the seventh lens is a lens with positive optical power, its object-side surface is convex and its image-side surface is concave.

[0020] like Figures 2 to 4 As shown, by reasonably matching the optical power, surface shape, air gap, and aperture position of each lens, the aberrations and defocusing caused by temperature changes in the optical system are fully corrected, giving the lens high resolution and calorific function.

[0021] The seven lenses are made of glass and plastic. The first and fourth lenses are glass spherical lenses, while the second, third, fifth, sixth, and seventh lenses are plastic aspherical lenses.

[0022] In Embodiment 1 of the present invention, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,13.0<f2 / f<14.0,59.0<f3 / f<60.0,1.0<f4 / f<2.0,2.0<f5 / f<3.0,-2.0<f6 / f<-1.0,3.0<f7 / f<4.0。

[0023] In Embodiment 1 of the present invention, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0024] In Embodiment 1 of the present invention, the air gap between the first lens and the second lens is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third lens and the fourth lens is 0~0.5mm; the air gap between the fourth lens and the fifth lens is 0~0.5mm; the air gap between the fifth lens and the sixth lens is 0~0.5mm; and the air gap between the sixth lens and the seventh lens is 0~0.5mm.

[0025] In Embodiment 1 of the present invention, the technical specifications achieved by the optical system are as follows: (1) Focal length: 5.0≤EFFL≤6.0mm; (2) Aperture F≤1.6; (3) Field of view: 2w ≥ 100°; (4) Operating wavelength: Visible light band; (5) Operating temperature: -40℃~95℃.

[0026] To achieve the above design parameters, the specific design parameters of the optical system in Embodiment 1 of the present invention are shown in Table 1 below: Table 1 The aspherical coefficients of each aspherical lens in the optical system of Embodiment 1 of the present invention are shown in Table 2 below: Table 2 In Embodiment 2 of the present invention, the first lens is a lens capable of negative optical power, with its object-side surface being convex and its image-side surface being concave; the second lens is a meniscus lens capable of negative optical power, with its object-side surface being concave and its image-side surface being convex; the third lens is a meniscus lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave; the fourth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the fifth lens is a biconvex lens capable of positive optical power, with both its object-side surface and image-side surface being convex; the sixth lens is a meniscus lens capable of negative optical power, with its object-side surface being concave and its image-side surface being convex; and the seventh lens is a lens capable of positive optical power, with its object-side surface being convex and its image-side surface being concave.

[0027] like Figures 6 to 8 As shown, by reasonably matching the optical power, surface shape, air gap, and aperture position of each lens, the aberrations and defocusing caused by temperature changes in the optical system are fully corrected, giving the lens high resolution and calorific function.

[0028] The seven lenses are made of glass and plastic. The first and fourth lenses are glass spherical lenses, while the second, third, fifth, sixth, and seventh lenses are plastic aspherical lenses.

[0029] In Embodiment 2 of the present invention, the focal length of the optical system is f, and the focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: -2.0 <f1 / f<-1.0,-87.0<f2 / f<-86.0,16.0<f3 / f<17.0,1.0<f4 / f<2.0,1.0<f5 / f<2.0,-2.0<f6 / f<-1.0,4.0<f7 / f<5.0。

[0030] In the second embodiment of the present invention, the first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

[0031] In Embodiment 2 of the present invention, the air gap between the first lens and the second lens is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third lens and the fourth lens is 0~0.5mm; the air gap between the fourth lens and the fifth lens is 0~0.5mm; the air gap between the fifth lens and the sixth lens is 0~0.5mm; and the air gap between the sixth lens and the seventh lens is 0~0.5mm.

[0032] In Embodiment 2 of the present invention, the technical specifications achieved by the optical system are as follows: (1) Focal length: 5.0≤EFFL≤6.0mm; (2) Aperture F≤1.6; (3) Field of view: 2w ≥ 100°; (4) Operating wavelength: Visible light band; (5) Operating temperature: -40℃~95℃.

[0033] To achieve the above design parameters, the specific design parameters of the optical system in Embodiment 2 of the present invention are shown in Table 3 below: Table 3 The aspherical coefficients of each aspherical lens in the optical system of Embodiment 2 of the present invention are shown in Table 4 below: Table 4 In summary, this application achieves high-resolution imaging performance by rationally allocating the optical power, surface shape, center thickness, and on-axis distance between each lens. This allows for high-definition imaging of large-area chips, a field of view exceeding 100 degrees, and a wide monitoring range. The glass-plastic hybrid structure is cost-effective and offers advantages such as a large aperture and low temperature drift, enabling clear imaging within a temperature range of -40℃ to 95℃.

[0034] In this embodiment of the invention, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses, and the equation of the aspherical curve is expressed as follows: Where Z is the distance from the vertex of the aspherical surface to the optical axis at a height of r; c is the paraxial curvature of the aspherical surface; k is the conic constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all higher-order coefficients.

[0035] In this embodiment of the invention, the total optical length TTL of the optical system and the focal length f of the optical system satisfy the following condition: 4.0 ≤ TTL / f ≤ 5.0.

[0036] In this embodiment of the invention, the F-number of the optical system is ≤1.8.

[0037] In this embodiment of the invention, the image height H of the optical system and the focal length f of the optical system satisfy the following condition: H / f≥1.5.

[0038] In this embodiment of the invention, the aperture stop of the optical system is located between the second lens and the third lens.

[0039] In this embodiment of the invention, an equivalent glass plate L8 is provided on the rear side of the seventh lens; an imaging surface IMA is provided behind the equivalent glass plate.

[0040] Unless otherwise stated, if any of the technical solutions disclosed in this invention specify a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this invention discloses only some numerical values ​​to illustrate the technical solutions of this invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0041] Furthermore, if the present invention discloses or relates to mutually fixedly connected components or structural parts, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral molding process).

[0042] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0043] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0044] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A large-aperture, large-aperture vehicle-mounted wide-angle lens, characterized in that, It includes an optical system, which consists of a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from left to right along the incident light path.

2. The large aperture, large target surface area vehicle-mounted wide-angle lens according to claim 1, characterized in that, The first lens is a lens capable of negative optical power, with a convex object-side surface and a concave image-side surface; the second lens is a meniscus lens capable of positive optical power, with a concave object-side surface and a convex image-side surface; the third lens is a meniscus lens capable of positive optical power, with a convex object-side surface and a concave image-side surface; the fourth lens is a biconvex lens capable of positive optical power, with both its object-side and image-side surfaces being convex; the fifth lens is a biconvex lens capable of positive optical power, with both its object-side and image-side surfaces being convex; the sixth lens is a meniscus lens capable of negative optical power, with a concave object-side surface and a convex image-side surface; and the seventh lens is a lens capable of positive optical power, with a convex object-side surface and a concave image-side surface.

3. The large aperture, large target surface area vehicle-mounted wide-angle lens according to claim 1, characterized in that, The focal length of the optical system is f. The focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively. The ratios of f1, f2, f3, f4, f5, f6, and f to f satisfy the following: -2.0 < f1 / f < -1.0, 13.0 < f2 / f < 14.0, 59.0 < f3 / f < 60.0, 1.0 < f4 / f < 2.0, 2.0 < f5 / f < 3.0, -2.0 < f6 / f < -1.0, and 3.0 < f7 / f < 4.

0.

4. The large aperture, large target surface area vehicle-mounted wide-angle lens according to claim 1, characterized in that, The first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

5. A large-aperture, large-aperture vehicle-mounted wide-angle lens according to claim 1, characterized in that, The air gap between the first and second lenses is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third and fourth lenses is 0~0.5mm; the air gap between the fourth and fifth lenses is 0~0.5mm; the air gap between the fifth and sixth lenses is 0~0.5mm; and the air gap between the sixth and seventh lenses is 0~0.5mm.

6. A large-aperture, large-aperture vehicle-mounted wide-angle lens according to claim 1, characterized in that, The first lens is a lens capable of negative optical power, with a convex object-side surface and a concave image-side surface; the second lens is a meniscus lens capable of negative optical power, with a concave object-side surface and a convex image-side surface; the third lens is a meniscus lens capable of positive optical power, with a convex object-side surface and a concave image-side surface; the fourth lens is a biconvex lens capable of positive optical power, with both its object-side and image-side surfaces being convex; the fifth lens is a biconvex lens capable of positive optical power, with both its object-side and image-side surfaces being convex; the sixth lens is a meniscus lens capable of negative optical power, with a concave object-side surface and a convex image-side surface; and the seventh lens is a lens capable of positive optical power, with a convex object-side surface and a concave image-side surface.

7. A large-aperture, large-aperture vehicle-mounted wide-angle lens according to claim 1, characterized in that, The focal length of the optical system is f. The focal lengths of the first lens, second lens, third lens, fourth lens, and fifth lens are f1, f2, f3, f4, f5, f6, and f7, respectively. The ratios of f1, f2, f3, f4, f5, f6, and f7 to f satisfy the following: -2.0 < f1 / f < -1.0, -87.0 < f2 / f < -86.0, 16.0 < f3 / f < 17.0, 1.0 < f4 / f < 2.0, 1.0 < f5 / f < 2.0, -2.0 < f6 / f < -1.0, and 4.0 < f7 / f < 5.

0.

8. A large-aperture, large-aperture vehicle-mounted wide-angle lens according to claim 1, characterized in that, The first lens satisfies the relationship: 1.5 ≤ N d ≤1.8, V d ≥50.0; The second lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The third lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; The sixth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; The seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; where N d V is the refractive index. d Let be Abbe's constant.

9. A large-aperture, large-aperture vehicle-mounted wide-angle lens according to claim 1, characterized in that, The air gap between the first and second lenses is 3.0~4.0mm; the air gap between the second lens and the aperture stop is 0~1.0mm; the air gap between the aperture stop and the third lens is -1.0~0mm; the air gap between the third and fourth lenses is 0~0.5mm; the air gap between the fourth and fifth lenses is 0~0.5mm; the air gap between the fifth and sixth lenses is 0~0.5mm; and the air gap between the sixth and seventh lenses is 0~0.5mm.

10. An imaging method using a large-aperture, large-area vehicle-mounted wide-angle lens as described in any one of claims 1-9, characterized in that, The light rays pass through the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens in sequence to form an image.

Images