In-cabin all-round confocal lens, camera device with in-cabin all-round confocal lens and driving tool with in-cabin all-round confocal lens

Abstract

The invention discloses an in-cabin looking-around confocal lens and a camera device and a driving tool with the same, the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, and the following conditions are met: 13.14 lt; fOV / Ym / 2lt; 24.36, FOV is the angle of view of the lens, and Ym is the image height of the lens corresponding to the FOV. According to the invention, large-view-field coverage is realized, and the consistency of visible light and infrared imaging is considered at the same time; it is ensured that the lens can shoot high-definition pictures at the high temperature of + 125 DEG C and the low temperature of-40 DEG C; the imaging resolution is high, the MTF level is kept excellent in a full-view-field range, and center and edge imaging is balanced; the aberration correction capability is outstanding, the chromatic aberration control is excellent, the chromatic aberration is stably controlled within 2pixel, and the purple edge inhibition effect is remarkable; and when the field angle is 80 degrees, the relative illumination is higher than 50%, and the image brightness distribution is uniform.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging lens technology, specifically relating to an in-cabin panoramic confocal lens and a camera device and driving vehicle having the same. Background Technology

[0002] With the rapid development of intelligent driving, intelligent perception, and vehicle assistance systems, vehicle vision systems are gradually evolving from single visible light imaging to multispectral, all-weather perception. Among them, optical systems that combine visible light and infrared imaging capabilities have been widely used in scenarios such as driver assistance, environmental perception, and safety monitoring due to their more stable imaging performance in low-light, nighttime, and complex environments.

[0003] In the aforementioned applications, fisheye lenses, with their ultra-wide field of view coverage, can achieve large-scale environmental information acquisition within limited installation space, reducing the number of cameras required by the system, and have become one of the important technical routes for wide-angle sensing products. Meanwhile, to achieve consistency in spatial location and imaging characteristics between visible light and infrared images, the industry is gradually introducing visible light-infrared confocal (common image plane) optical design schemes to improve the stability and reliability of multispectral fusion algorithms.

[0004] Currently, most mainstream fisheye infrared or visible light lens solutions in the industry adopt a compromise design structure that optimizes a single band or favors a specific operating band. In practical applications, while these solutions can achieve large field-of-view imaging to a certain extent, they still have limitations in terms of multi-band consistency, imaging uniformity, and system stability, mainly in the following aspects: 1) Insufficient consistency in multi-band imaging: When multiple bands are shared, existing fisheye lenses are prone to problems such as inconsistent focal planes, differences in magnification, or inconsistent aberration performance, which affect the registration accuracy and fusion effect of multispectral images. 2) Limited imaging uniformity under large field of view: Under the design conditions of fisheye ultra-large field of view, existing technologies are prone to rapid attenuation of illumination and significant decrease in MTF in the edge area; 3) Aberration and chromatic aberration are difficult to control: Due to the strong negative light power distribution and large incident angle light conditions in the fisheye structure, chromatic aberration, off-axis aberration and purple fringing are more prominent in traditional design schemes. Especially in multi-band shared systems, the superposition effect is more obvious, which affects the image quality. 4) Limited temperature adaptability and system stability: Some existing lenses exhibit significant fluctuations in focal plane position and imaging performance when the ambient temperature changes. Summary of the Invention

[0005] To address the problems in the prior art, the present invention aims to provide an in-cabin surround-view confocal lens, a camera device having the same, and a driving vehicle.

[0006] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: An in-cabin panoramic confocal lens has six lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side. The first lens 1 has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power, its object side is concave, and its image side is concave. The third lens has positive optical power, its object side is convex, and its image side is convex. The fourth lens has positive or negative optical power, its object side is concave, and its image side is convex. The fifth lens has negative optical power, its object side is concave, and its image side is concave. The sixth lens has positive optical power, its object side is convex, and its image side is convex. The in-cabin surround-view confocal lens meets the following conditions: 13.14 <FOV / Ym / 2<24.36; Wherein, FOV is the lens field of view, and Ym is the lens image height corresponding to FOV. Here, the field of view represents the horizontal or maximum field of view.

[0007] Furthermore, the in-cabin surround-view confocal lens satisfies the following conditions: 11.84 <TTL / f<16.79; Where TTL is the distance from the vertex of the first lens in the lens to the image plane, and f is the total focal length of the lens.

[0008] Furthermore, the in-cabin surround-view confocal lens satisfies the following conditions: 9.45 < 2 * D1 / f < 13.59; Where 2*D1 is the effective diameter of the first lens, and f is the total focal length of the lens.

[0009] Furthermore, the in-cabin surround-view confocal lens satisfies the following conditions: Y1*180 / pi>0.82; Where Y1 is the image height of the lens when the half field of view is 1°, and pi is pi.

[0010] Furthermore, the in-cabin surround-view confocal lens satisfies the following conditions: 0.198 > BFL / TTL > 0.129; Wherein, BFL is the distance on the optical axis from the center of the side of the last lens of the in-cabin panoramic confocal lens to the imaging surface of the lens.

[0011] Furthermore, the in-cabin surround-view confocal lens satisfies the following conditions: -7.25≤f1 / f≤-4.94; -2.55≤f² / f≤-2.22; 2.43≤f3 / f≤3.45; -43.85≤f4 / f≤10.99; -2.43≤f5 / f≤-1.58; 1.39≤f6 / f≤1.91; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the total focal length of the lens.

[0012] Furthermore, the fifth and sixth lenses are cemented doublet lenses.

[0013] Furthermore, the first and third lenses are spherical lenses made of glass; the second, fourth, fifth, and sixth lenses are aspherical lenses made of plastic. The refractive index Nd1 of the material of the first lens satisfies 1.72 < Nd1 ≤ 2.00, and its Abbe constant Vd1 satisfies 31.22 < Vd1 ≤ 46.64; The refractive index Nd of the material of the third lens satisfies 1.75≤Nd3≤2.10, and its Abbe constant Vd4 satisfies 28.22≤Vd3≤35.35.

[0014] The present invention also discloses a camera device, including an in-cabin panoramic confocal lens as described above.

[0015] The present invention also discloses a driving tool, including an in-cabin surround-view confocal lens as described above, wherein the driving tool is a vehicle, ship, aircraft or drone.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The cabin surround view confocal lens of the present invention is a fisheye confocal lens, which achieves a large field of view coverage while taking into account the consistency of visible light and infrared imaging. (2) The defocus amount of the in-cabin panoramic confocal lens of the present invention is less than 8.325μm at both high temperature +125℃ and low temperature -40℃. Such a small defocus amount ensures that the lens can capture high-definition images at both high temperature +125℃ and low temperature -40℃; it has good temperature stability, and the focal plane drift is small when the temperature changes, and the changes in imaging performance are controllable. (3) The in-cabin panoramic confocal lens of the present invention has high imaging resolution, maintains excellent MTF level in the entire field of view, and has balanced imaging at the center and edge. (4) The in-cabin panoramic confocal lens of the present invention has outstanding aberration correction capability, excellent chromatic aberration control, and is stably controlled within 2 pixels, with significant purple fringing suppression effect; (5) The in-cabin panoramic confocal lens of the present invention still maintains excellent illumination performance under the design conditions of fisheye large field of view. When the field of view is 80°, the relative illumination (RI) can be higher than 50%, which is significantly better than similar fisheye lens solutions, and the brightness distribution of the image is uniform. (6) The in-cabin panoramic confocal lens of the present invention adopts a short focal length design, has a large depth of field range, and has strong adaptability to changes in target distance; (7) The reasonable allocation and coordinated design of negative light focal length of the in-cabin panoramic confocal lens of the present invention makes the lens insensitive to manufacturing tolerances and assembly errors, and has high overall robustness. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a temperature analysis curve of -40℃ for Example 1 of the present invention; Figure 3 This is a temperature analysis curve at 25°C for Embodiment 1 of the present invention; Figure 4 This is a temperature analysis curve at 125°C for Embodiment 1 of the present invention; Figure 5 This is an MTF vs. Field curve diagram of Embodiment 1 of the present invention; Figure 6 This is a relative illumination diagram of Embodiment 1 of the present invention; Figure 7 This is a color difference diagram of Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 9 This is a temperature analysis curve of -40℃ for Example 2 of the present invention; Figure 10 This is a temperature analysis curve at 25°C for Embodiment 2 of the present invention; Figure 11 This is a temperature analysis curve at 125°C for Embodiment 2 of the present invention; Figure 12 This is an MTF vs. Field curve diagram of Embodiment 2 of the present invention; Figure 13 This is a relative illumination diagram of Embodiment 2 of the present invention; Figure 14 This is a color difference diagram of Embodiment 2 of the present invention; Figure 15 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 16 This is a temperature analysis curve of -40℃ for Example 3 of the present invention; Figure 17 This is a temperature analysis curve at 25°C for Example 3 of the present invention; Figure 18 This is a temperature analysis curve at 125°C for Embodiment 3 of the present invention; Figure 19 This is an MTF vs. Field curve diagram of Embodiment 3 of the present invention; Figure 20 This is a relative illumination diagram of Embodiment 3 of the present invention. Detailed Implementation

[0018] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0019] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0020] like Figure 1-20 As shown, the present invention discloses an in-cabin panoramic confocal lens with 6 lenses, including a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 6 and a sixth lens 7 arranged sequentially from the object side to the image side.

[0021] In some embodiments, the aforementioned cabin surround-view confocal lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, an IR filter 8, and an image plane IMA 9 arranged sequentially from the object side to the image side.

[0022] In some embodiments, the first lens 1 has negative optical power, its object side is convex, and its image side is concave; the second lens 2 has negative optical power, its object side is concave, and its image side is concave; the third lens 3 has positive optical power, its object side is convex, and its image side is convex; the fourth lens 4 has positive or negative optical power, its object side is concave, and its image side is convex; the fifth lens 6 has negative optical power, its object side is concave, and its image side is concave; and the sixth lens 7 has positive optical power, its object side is convex, and its image side is convex.

[0023] In some embodiments, the fifth lens 6 and the sixth lens 7 are cemented doublet lenses.

[0024] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: 13.14 <FOV / Ym / 2<24.36; Wherein, FOV is the lens field of view, Y is the lens image height corresponding to FOV, and the field of view here represents the horizontal or maximum field of view.

[0025] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: 11.84 <TTL / f<16.79; Where TTL is the distance from the vertex of the first lens in the lens to the image plane, and f is the total focal length of the lens.

[0026] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: 9.45 < 2 * D1 / f < 13.59; Where 2*D1 is the effective diameter of the first lens.

[0027] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: Y1*180 / pi>0.82; Where Y1 is the image height of the lens when the half field of view is 1°, and pi is pi.

[0028] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: 0.198 > BFL / TTL > 0.129; Wherein, BFL is the distance along the optical axis from the center of the side of the last lens of the aforementioned in-cabin panoramic confocal lens to the imaging plane of the in-cabin panoramic confocal lens. This is beneficial for increasing the optical back focal length of the lens and leaving sufficient space for the module.

[0029] In some embodiments, the aforementioned cabin surround-view confocal lens satisfies the following conditions: -7.25≤f1 / f≤-4.94; -2.55≤f² / f≤-2.22; 2.43≤f3 / f≤3.45; -43.85≤f4 / f≤10.99; -2.43≤f5 / f≤-1.58; 1.39≤f6 / f≤1.91; Where f1 is the focal length of the first lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 6, and f6 is the focal length of the sixth lens 7.

[0030] In some embodiments, the first lens 1 and the third lens 3 are spherical lenses, and the second lens 2, the fourth lens 4, the fifth lens 6 and the sixth lens 7 are aspherical lenses.

[0031] In some embodiments, the first lens 1 and the third lens 3 are made of glass, while the second lens 2, the fourth lens 4, the fifth lens 6 and the sixth lens 7 are made of plastic.

[0032] In some embodiments, the refractive index Nd1 of the material of the first lens 1 satisfies 1.72 < Nd1 ≤ 2.00, and its Abbe constant Vd1 satisfies 31.22 < Vd1 ≤ 46.64; the refractive index Nd of the material of the third lens 3 satisfies 1.75 ≤ Nd3 ≤ 2.10, and its Abbe constant Vd4 satisfies 28.22 ≤ Vd3 ≤ 35.35.

[0033] In some implementations, the defocusing amount of the aforementioned cabin surround-view confocal lens is less than 8.325μm at both high temperature (+125℃) and low temperature (-40℃). This small defocusing amount ensures that the lens can capture high-definition images at both high temperature (+125℃) and low temperature (-40℃).

[0034] Example 1 like Figure 1-7 As shown, an in-cabin panoramic confocal lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, an IR filter 8, and an image plane IMA 9 arranged sequentially from the object side to the image side.

[0035] The first lens 1 has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens 2 has negative optical power, with a concave object-side surface and a concave image-side surface; the third lens 3 has positive optical power, with a convex object-side surface and a convex image-side surface; the fourth lens 4 has positive optical power, with a concave object-side surface and a convex image-side surface; the fifth lens 6 has negative optical power, with a concave object-side surface and a concave image-side surface; the sixth lens 7 has positive optical power, with a convex object-side surface and a convex image-side surface; the fifth lens 6 and the sixth lens 7 are cemented doublet lenses.

[0036] The lens optical parameters provided in this embodiment are shown in Table 1 below.

[0037] Table 1 In Table 1, when the radius of curvature of the surfaces of aperture 5 and filter IR 8 is Infinity, it indicates that the surface is a plane.

[0038] The lens focal length and other optical parameters provided in this embodiment are shown in Table 2 below.

[0039] Table 2 The aspherical surface in a lens is described by the following formula: z(r) = (cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1) Where z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are the coefficients of higher-order terms of the aspherical surface. For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0040] The aspherical surface parameters of the lens in this embodiment are shown in Table 3 below.

[0041] Table 3 Figure 2 This is a temperature analysis curve of -40℃ for Example 1. Figure 3 This is a temperature analysis curve at 25°C for Example 1. Figure 4 This is a temperature analysis curve at 125°C for Example 1. (From...) Figure 2-4 It can be seen that the defocus amount of the above-mentioned cabin surround-view confocal lens is less than 8.325μm at both high temperature +125℃ and low temperature -40℃. Such a small defocus amount ensures that the lens can shoot high-definition images at both high temperature +125℃ and low temperature -40℃.

[0042] Figure 5 The MTF vs Field curve of Example 1 reflects the resolving power of the cabin surround-view confocal lens. Its MTF value of 100LP / mm is greater than 0.6 at a field of view of 50°, which can reflect that the lens has high resolving power and clear imaging.

[0043] Figure 6The relative illuminance diagram for Example 1 shows the illuminance value on the vertical axis and the field of view on the horizontal axis, reflecting the uniformity of illuminance in the lens's image. When the field of view is 80°, the relative illuminance (RI) can be higher than 50%, which means it has high relative illuminance and sufficient light intake. This ensures that even when the lens is used in a dimly lit environment, there will be no dark corners at the edges of the actual image.

[0044] Figure 7 The color difference diagram for Example 1 shows that the maximum color difference value is less than 2 pixels, which reflects the excellent color difference correction effect and good purple fringing effect of the lens.

[0045] Example 2 like Figure 8-14 As shown, an in-cabin panoramic confocal lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, an IR filter 8, and an image plane IMA 9 arranged sequentially from the object side to the image side.

[0046] The first lens 1 has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens 2 has negative optical power, with a concave object-side surface and a concave image-side surface; the third lens 3 has positive optical power, with a convex object-side surface and a convex image-side surface; the fourth lens 4 has positive optical power, with a concave object-side surface and a convex image-side surface; the fifth lens 6 has negative optical power, with a concave object-side surface and a concave image-side surface; the sixth lens 7 has positive optical power, with a convex object-side surface and a convex image-side surface; the fifth lens 6 and the sixth lens 7 are cemented doublet lenses.

[0047] The lens optical parameters provided in this embodiment are shown in Table 4 below.

[0048] Table 4 In Table 4, when the radius of curvature of the surfaces of aperture 5 and filter IR 8 is Infinity, it indicates that the surface is a plane.

[0049] The lens focal length and other optical parameters provided in this embodiment are shown in Table 5 below.

[0050] Table 5 The aspherical surface in a lens is described by the following formula: z(r) = (cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12+A14r 14 +A16r 16 +A18r 18 +A20r 20 (1) Where z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are the coefficients of higher-order terms of the aspherical surface. For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0051] The aspherical surface parameters of the lens in this embodiment are shown in Table 6 below.

[0052] Table 6 Figure 9 This is a temperature analysis curve of -40℃ for Example 2. Figure 10 This is a temperature analysis curve at 25°C for Example 2. Figure 11 This is a temperature analysis curve at 125°C for Example 2. (From...) Figure 9-11 It can be seen that the defocus amount of the above-mentioned cabin surround-view confocal lens is less than 8.325μm at both high temperature +125℃ and low temperature -40℃. Such a small defocus amount ensures that the lens can shoot high-definition images at both high temperature +125℃ and low temperature -40℃.

[0053] Figure 12 The MTF vs Field curve of Example 2 reflects the resolving power of the cabin surround-view confocal lens. Its MTF value of 100LP / mm is greater than 0.6 at a field of view of 50°, which can reflect that the lens has high resolving power and clear imaging.

[0054] Figure 13 The relative illuminance diagram for Example 2 shows the illuminance value on the vertical axis and the field of view on the horizontal axis, reflecting the uniformity of illuminance in the lens's image. When the field of view is 80°, the relative illuminance (RI) can be higher than 50%, which means it has high relative illuminance and sufficient light intake. This ensures that even when the lens is used in a relatively dark environment, there will be no dark corners at the edges of the actual image.

[0055] Figure 14 The color difference diagram for Example 2 shows that the maximum color difference value is less than 3 pixels, which reflects the excellent color difference correction effect and good purple fringing effect of the lens.

[0056] Example 3 like Figure 15-20As shown, an in-cabin panoramic confocal lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, an IR filter 8, and an image plane IMA 9 arranged sequentially from the object side to the image side.

[0057] The first lens 1 has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens 2 has negative optical power, with a concave object-side surface and a concave image-side surface; the third lens 3 has positive optical power, with a convex object-side surface and a convex image-side surface; the fourth lens 4 has positive optical power, with a concave object-side surface and a convex image-side surface; the fifth lens 6 has negative optical power, with a concave object-side surface and a concave image-side surface; the sixth lens 7 has positive optical power, with a convex object-side surface and a convex image-side surface; the fifth lens 6 and the sixth lens 7 are cemented doublet lenses.

[0058] The lens optical parameters provided in this embodiment are shown in Table 7 below.

[0059] Table 7 In Table 7, when the radius of curvature of the surfaces of aperture 5 and filter IR 8 is Infinity, it indicates that the surface is a plane.

[0060] The lens focal length and other optical parameters provided in this embodiment are shown in Table 8 below.

[0061] Table 8 The aspherical surface in a lens is described by the following formula: z(r) = (cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1) Where z(r) is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis, c = 1 / r, r represents the radius of curvature of the aspherical mirror, k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are the coefficients of higher-order terms of the aspherical surface. For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0062] The aspherical surface parameters of the lens in this embodiment are shown in Table 9 below.

[0063] Table 9 Figure 16 This is a temperature analysis curve of -40℃ for Example 3. Figure 17 This is a temperature analysis curve at 25°C for Example 3. Figure 18 This is a temperature analysis curve at 125°C for Example 3. (From...) Figure 16-18 It can be seen that the defocus amount of the above-mentioned cabin surround-view confocal lens is less than 8.325μm at both high temperature +125℃ and low temperature -40℃. Such a small defocus amount ensures that the lens can shoot high-definition images at both high temperature +125℃ and low temperature -40℃.

[0064] Figure 19 The MTF vs Field curve of Example 3 reflects the resolving power of the cabin surround-view confocal lens. Its MTF value of 100LP / mm is greater than 0.6 at a field of view of 50°, which can reflect that the lens has high resolving power and clear imaging.

[0065] Figure 20 The relative illuminance diagram for Example 3 shows the illuminance value on the vertical axis and the field of view on the horizontal axis, reflecting the uniformity of illuminance in the lens's image. When the field of view is 80°, the relative illuminance (RI) can be higher than 50%, which means it has high relative illuminance and sufficient light intake. This ensures that even when the lens is used in a dimly lit environment, there will be no dark corners at the edges of the actual image.

[0066] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An in-cabin panoramic confocal lens, comprising six lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side, characterized in that, The first lens has negative optical power, its object side is convex, and its image side is concave; the second lens has negative optical power, its object side is concave, and its image side is concave; the third lens has positive optical power, its object side is convex, and its image side is convex; the fourth lens has positive or negative optical power, its object side is concave, and its image side is convex; the fifth lens has negative optical power, its object side is concave, and its image side is concave; and the sixth lens has positive optical power, its object side is convex, and its image side is convex. The in-cabin surround-view confocal lens meets the following conditions: 13.14 <FOV / Ym / 2<24.36; Wherein, FOV is the lens field of view, and Ym is the lens image height corresponding to FOV. Here, the field of view represents the horizontal or maximum field of view.

2. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The in-cabin surround-view confocal lens meets the following conditions: 11.84 <TTL / f<16.79; Where TTL is the distance from the vertex of the first lens in the lens to the image plane, and f is the total focal length of the lens.

3. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The in-cabin surround-view confocal lens meets the following conditions: 9.45 < 2 * D1 / f < 13.59; Where 2*D1 is the effective diameter of the first lens, and f is the total focal length of the lens.

4. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The in-cabin surround-view confocal lens meets the following conditions: Y1*180 / pi>0.82; Where Y1 is the image height of the lens when the half field of view is 1°, and pi is pi.

5. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The in-cabin surround-view confocal lens meets the following conditions: 0.198 > BFL / TTL > 0.129; Wherein, BFL is the distance on the optical axis from the center of the side of the last lens of the in-cabin panoramic confocal lens to the imaging surface of the lens.

6. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The in-cabin surround-view confocal lens meets the following conditions: -7.25≤f1 / f≤-4.94; -2.55≤f² / f≤-2.22; 2.43≤f3 / f≤3.45; -43.85≤f4 / f≤10.99; -2.43≤f5 / f≤-1.58; 1.39≤f6 / f≤1.91; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the total focal length of the lens.

7. The in-cabin panoramic confocal lens according to claim 1, characterized in that, The fifth and sixth lenses are cemented doublet lenses.

8. An in-cabin panoramic confocal lens according to claim 1, characterized in that, The first and third lenses are spherical lenses made of glass; the second, fourth, fifth, and sixth lenses are aspherical lenses made of plastic. The refractive index Nd1 of the material of the first lens satisfies 1.72 < Nd1 ≤ 2.00, and its Abbe constant Vd1 satisfies 31.22 < Vd1 ≤ 46.64; The refractive index Nd of the material of the third lens satisfies 1.75≤Nd3≤2.10, and its Abbe constant Vd4 satisfies 28.22≤Vd3≤35.

35.

9. A camera device, characterized in that, Including an in-cabin panoramic confocal lens as described in any one of claims 1-8.

10. A driving tool, characterized in that, Includes an in-cabin surround-view confocal lens as described in any one of claims 1-8, wherein the driving vehicle is a vehicle, ship, aircraft, or drone.

Images