A day and night confocal vehicle lens

Abstract

This invention provides a day / night confocal vehicle lens, comprising, along the incident direction of the optical axis, a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, a sixth lens, a first filter, and an image plane IMA. The first lens has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens has positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens has negative optical power, with a concave object-side surface and a concave image-side surface. The fifth lens has positive optical power, with a convex object-side surface and a convex image-side surface. The sixth lens has negative optical power and is meniscus-shaped. The fourth and fifth lenses form a cemented lens. Its structure is simple and possesses advantages such as high resolution, a large image plane, small size, high relative illumination, and high pixel density, improving image illumination uniformity and image clarity while reducing lens production costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and particularly relates to a day and night confocal vehicle-mounted lens. BACKGROUND

[0002] With the progress of technology, the day and night confocal lens can realize effective work in the car in the daytime and at night, and is widely used in the field of automobiles and automatic driving. The existing day and night confocal lens has the following technical problems:

[0003] 1) The optical field curvature of the traditional day and night confocal lens is large, and the distortion is large, resulting in unclear image;

[0004] 2) The relative luminance of the traditional day and night confocal lens is low, resulting in poor uniformity of picture luminance;

[0005] 3) The resolving power of the traditional day and night confocal lens is low, and the imaging is not clear, which cannot meet the requirements of high-pixel imaging;

[0006] 4) With the market demand for high-pixel, large target surface, small head size of the day and night confocal lens, the number of lenses inside the lens increases, the volume increases, and the production cost greatly increases. SUMMARY

[0007] In order to solve the above technical problems, the present application provides a day and night confocal vehicle-mounted lens, which has the advantages of simple structure, high resolving power, large target surface, small volume, high relative luminance and high-pixel imaging, improves the uniformity of picture luminance and the clarity of imaging, and the head size of the lens is smaller, the field of view can be wider, and the production cost of the day and night confocal vehicle-mounted lens is reduced.

[0008] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0009] A day and night confocal vehicle-mounted lens is provided, which is sequentially provided with a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a first filter and an image plane IMA along the optical axis incident direction;

[0010] The first lens has negative optical power, the object side surface is convex, and the image side surface is concave;

[0011] The second lens has positive optical power, the object side surface is concave, and the image side surface is convex;

[0012] The third lens has positive optical power, the object side surface is convex, and the image side surface is convex;

[0013] The fourth lens has negative optical power, the object side surface is concave, and the image side surface is concave;

[0014] The fifth lens has positive refractive power, a convex object side surface and a convex image side surface.

[0015] The sixth lens has negative refractive power and is meniscus-shaped.

[0016] The fourth lens and the fifth lens form a cemented lens.

[0017] The present application provides a day and night confocal vehicle lens, which has the advantages of simple structure, high resolving power, large target surface, small volume, high relative luminance and high pixel imaging, improves the uniformity of picture luminance and the imaging clarity, and has a smaller head size, can shoot a wider field of view, and reduces the production cost of the day and night confocal vehicle lens.

[0018] As a preferred technical solution, the object side surface of the sixth lens is concave or convex, and the image side surface is convex or concave.

[0019] As a preferred technical solution, the first lens is a glass spherical lens, the third lens is a glass aspherical lens, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspherical lenses.

[0020] As a preferred technical solution, a second filter is arranged between the first lens and the second lens.

[0021] As a preferred technical solution, a second filter is arranged between the sixth lens and the first filter.

[0022] As a preferred technical solution, the first lens satisfies 1.71>Nd1>1.57 and 71.3>Vd1>53.8, where Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; the third lens satisfies Nd3>1.59 and 68.3>Vd3>67.0, where Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens.

[0023] As a preferred technical solution, the day and night confocal vehicle lens satisfies the following conditions: 0.23>BFL / TTL>0.16, where BFL is the distance from the center of the image side surface of the sixth lens to the imaging surface of the day and night confocal vehicle lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the day and night confocal vehicle lens on the optical axis.

[0024] As a preferred technical solution, the day and night confocal vehicle lens satisfies the following conditions: -3.56<=f1 / f<=-1.24, 3.77<=f2 / f<=4.05, 1.72<=f3 / f<=2.22, -1.43<=f4 / f<=-1.18, 1.07<=f5 / f<=1.19, -6.76<=f6 / f<=-3.99, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence, and f is the overall focal length value of the day and night confocal vehicle lens.

[0025] As a preferred technical solution, the total length of the day and night confocal vehicle lens is <14.28mm.

[0026] As a preferred technical solution, when the maximum field of view angle of the day and night confocal vehicle lens is 142°, the relative luminance is >0.6.

[0027] The day and night confocal vehicle lens provided by the application has the following beneficial effects:

[0028] 1) The day and night confocal vehicle lens provided by the application has the advantages of simple structure, high resolving power, large target surface, small size, high relative luminance and high-pixel imaging, improves the uniformity of picture luminance and the imaging clarity, and has a smaller head size, so that a wider view field can be shot, and the production cost of the day and night confocal vehicle lens is reduced.

[0029] 2) The day and night confocal vehicle lens provided by the application has the advantages of simple structure, meets the 5 million pixel imaging requirement, has an optical head size of 6.0mm, has a smaller head size, and can shoot a view field with a maximum field of view angle of up to 142°, so that a wider view field can be shot.

[0030] 3) The day and night confocal vehicle lens provided by the application has high resolving power and clear imaging.

[0031] 4) The day and night confocal vehicle lens provided by the application has small optical field curvature and small distortion, and the image is clear.

[0032] 5) The application provides a day and night confocal vehicle-mounted lens, the first lens has negative refractive power, the object side is convex, the image side is concave, the first lens is crescent-shaped, which is beneficial to collect light and reduce distortion and improve imaging quality; the diaphragm is arranged between the second lens and the third lens, which is beneficial to reduce the lens aperture; the second lens has positive refractive power, the object side is concave, and the image side is convex, which is beneficial to smoothly accept the turning light and reduce aberration and reduce the sensitivity of the lens, and is also beneficial to reduce the lens aperture; the third lens is a non-spherical lens with positive refractive power, which is beneficial to turn the light and reduce the length of the lens; the fourth lens and the fifth lens are double cemented lenses, which are beneficial to correct chromatic aberration and improve imaging quality, and the sixth lens is a crescent-shaped lens with negative refractive power, which is beneficial to improve the image size and correct the chip CRA, and realize the large target surface of the lens.

[0033] 6) The day and night confocal vehicle-mounted lens provided by the application has a maximum field angle of 142°, and the relative luminance is greater than 0.6, which reflects that the lens has higher relative luminance and better picture illumination uniformity. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The structure combination diagram of the day and night confocal vehicle-mounted lens provided for example 1 (the object side is at the leftmost position, and the image side is at the rightmost position);

[0035] Figure 2 The field curvature distortion diagram of the day and night confocal vehicle-mounted lens provided for example 1;

[0036] Figure 3 The MTF VS Field curve diagram of the day and night confocal vehicle-mounted lens provided for example 1;

[0037] Figure 4 The relative luminance diagram of the day and night confocal vehicle-mounted lens provided for example 1;

[0038] Figure 5 The structure combination diagram of the day and night confocal vehicle-mounted lens provided for example 2 (the object side is at the leftmost position, and the image side is at the rightmost position);

[0039] Figure 6 The field curvature distortion diagram of the day and night confocal vehicle-mounted lens provided for example 2;

[0040] Figure 7 The MTF VS Field curve diagram of the day and night confocal vehicle-mounted lens provided for example 2;

[0041] Figure 8 The relative luminance diagram of the day and night confocal vehicle-mounted lens provided for example 2;

[0042] Wherein, 1-first lens; 2-second lens; 3-third lens; 4-fourth lens; 5-fifth lens; 6-sixth lens; 7-diaphragm; 8-first filter; 9-image plane IMA; 10-second filter. DETAILED DESCRIPTION

[0043] It should be noted that the use of the words "first", "second", "third", "fourth", "fifth" and "sixth" to define the components is only for the convenience of distinguishing the corresponding components, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0044] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0045] It can be understood that the present application achieves the purpose of the present application through some embodiments.

[0046] Example 1

[0047] As shown in the Figure 1 The present application provides a day and night confocal vehicle lens, which is provided with a first lens 1, a second lens 2, a diaphragm 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a first filter 8 and an image plane IMA 9 in sequence along the incident direction of the optical axis.

[0048] The first lens 1 has a negative focal power, and the object side is convex and the image side is concave.

[0049] The second lens 2 has a positive focal power, and the object side is concave and the image side is convex.

[0050] The third lens 3 has a positive focal power, and the object side is convex and the image side is convex.

[0051] The fourth lens 4 has a negative focal power, and the object side is concave and the image side is concave.

[0052] The fifth lens 5 has a positive focal power, and the object side is convex and the image side is convex.

[0053] The sixth lens 6 has a negative focal power, and the object side is concave and the image side is convex.

[0054] The sixth lens 6 is a crescent-shaped plastic lens to increase the image plane size, and the image plane size reaches 6mm, realizing a large target surface of the day and night confocal vehicle lens.

[0055] The fourth lens 4 and the fifth lens 5 form a cemented lens.

[0056] The first lens 1 and the second lens 2 are provided with a second filter 10 therebetween.

[0057] The day and night confocal vehicle lens satisfies the following condition: 0.23 > BFL / TTL > 0.16, wherein BFL is the distance from the sixth lens 6 image side center to the imaging surface of the day and night confocal vehicle lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the day and night confocal vehicle lens on the optical axis, which is beneficial to increase the lens optical back focal length and leave sufficient space for the module;

[0058] The day and night confocal vehicle lens satisfies the following condition: -3.56 ≤ f1 / f ≤ -1.24, 3.77 ≤ f2 / f ≤ 4.05, 1.72 ≤ f3 / f ≤ 2.22, -1.43 ≤ f4 / f ≤ -1.18, 1.07 ≤ f5 / f ≤ 1.19, -6.76 ≤ f6 / f ≤ -3.99, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6, respectively, and f is the focal length of the whole day and night confocal vehicle lens, which is beneficial to reduce the assembly sensitivity, control the high and low temperature back focal length drift of the lens in a small range, and satisfy clear imaging by reasonably matching the focal lengths of the lenses;

[0059] The total length of the day and night confocal vehicle lens is 14.27, which satisfies the total length of the day and night confocal vehicle lens < 14.28 mm, and realizes the requirement of small size of the whole lens;

[0060] The first lens 1 has a negative focal length, the object side is convex, and the image side is concave, which is beneficial to collect light and reduce distortion and improve imaging quality; the diaphragm 7 is arranged between the second lens 2 and the third lens 3, which is beneficial to reduce the lens aperture; the second lens 2 has a positive focal length, the object side is concave, and the image side is convex, which is beneficial to smoothly accept the turning light, reduce aberration, reduce the sensitivity of the lens, and also beneficial to reduce the lens aperture; the third lens 3 is a non-spherical lens with a positive focal length, which is beneficial to turn the light and reduce the length of the lens; the fourth lens 4 and the fifth lens 5 are double cemented lenses, which are beneficial to correct chromatic aberration and improve imaging quality; the sixth lens 6 is a meniscus negative focal length lens, which is beneficial to improve the image size, correct the chip CRA, and realize a large target surface of the lens; the optical parameters of the day and night confocal vehicle lens provided in embodiment 1 are shown in table 1:

[0061] Table 1: Optical parameters of the day and night confocal vehicle lens provided in embodiment 1

[0062]

[0063] From table 1, it can be observed that the curvature radius of the diaphragm 7 is infinite, which indicates that this surface is a plane;

[0064] The first lens 1 Nd1 is 1.70, Vd1 is 53.7, and 1.71> Nd1> 1.57, 71.3> Vd1> 53.8 are satisfied, wherein Nd1 refers to the refractive index of the first lens 1, and Vd1 refers to the Abbe number of the first lens 1;

[0065] The third lens 3 Nd3 is 1.60, Nd3 is 68.2, and Nd3> 1.59, 68.3> Vd3> 67.0 are satisfied, wherein Nd3 refers to the refractive index of the third lens 3, and Vd3 refers to the Abbe number of the third lens 3;

[0066] The first lens 1 is a glass spherical lens, and the third lens 3 is a glass aspherical lens, the second lens 2, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are plastic aspherical lenses; the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 all satisfy the following conditions:

[0067] z=(cr2) / {1+[1-(k+1)(c2r2)]1 / 2}+A4r4+A6r6+A8r8+A10r10+A12r12+A14r14+A16r16+A18r18+A20r 20(1)

[0069] Wherein, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the vertical distance of the point on the aspherical surface to the optical axis, and z is the aspherical depth (the vertical distance between the point on the aspherical surface with a distance of r to the optical axis and the tangent plane tangent to the vertex of the optical axis of the aspherical surface); for the convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1), but the present application is not limited to the aspherical polynomial form represented by the formula (1); the coefficients of the aspherical lens surface provided in example 1 are shown in the following table 2:

[0070] Table 2 Coefficients of aspherical lens surface provided in example 1

[0071]

[0072]

[0073] As Figure 2As shown, the field curvature and distortion diagram of the day-night confocal vehicle lens provided in this embodiment is as follows: The left figure is the field curvature curve diagram, where the vertical axis of the field curvature curve is the field angle and the horizontal axis is the distance of the image point from the paraxial image plane. T represents the meridional field curvature and S represents the sagittal field curvature. The field curvature curve shows the distance from the current focal plane or image plane to the paraxial focal plane, which is used as a function of the field coordinates. It is divided into meridional field curvature and sagittal field curvature. The right figure is the distortion curve diagram, where the vertical axis of the distortion curve is the field angle and the horizontal axis is the distortion percentage. Distortion belongs to the principal ray aberration and reflects the similarity of the object. The day-night confocal vehicle lens in this specific embodiment has a small optical field curvature, small distortion, and clear image.

[0074] like Figure 3 As shown in the figure, the MTF VS Field curve of the day and night confocal vehicle lens provided in this embodiment is shown. The vertical axis of the MTF VS Field curve is the MTF value, and the horizontal axis is the image point height. The MTF VS Field of the lens reflects the lens's resolving power. The day and night confocal vehicle lens in this specific embodiment has a concentrated curve of 119 LP / mm and a very high MTF value, which can reflect the lens's high resolving power and clear imaging.

[0075] like Figure 4 As shown in the figure, the relative illuminance diagram of the day and night confocal vehicle lens provided in this embodiment is shown. The vertical axis of the relative illuminance diagram is the illuminance value, and the horizontal axis is the field of view. The relative illuminance diagram of the lens reflects the uniformity of the image illuminance of the lens. In this specific embodiment, the day and night confocal vehicle lens has a relative illuminance greater than 0.6 when the maximum field of view is 142°, which reflects that the lens has a high relative illuminance and a better uniformity of image illuminance.

[0076] The day / night co-focus vehicle-mounted lens provided in this embodiment has a design wavelength range of 435-656nm plus 940nm to achieve day and night co-focus functionality. It also meets the requirements for 5-megapixel imaging, has an optical head size of 6.0mm, and a maximum field of view of up to 142°. This day / night co-focus vehicle-mounted lens has a simple structure and advantages such as high resolution, large target area, small size, high relative illumination, and high pixel density, improving the uniformity of illumination and image clarity. Furthermore, the smaller lens head size allows for a wider field of view and reduces the production cost of the day / night co-focus vehicle-mounted lens.

[0077] Example 2

[0078] like Figure 5 As shown, the present invention provides a day and night confocal vehicle lens, which is provided with a first lens 1, a second lens 2, an aperture 7, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a first filter 8 and an image plane IMA 9 in sequence along the incident direction of the optical axis;

[0079] The first lens 1 has negative focal power, the object side surface is convex, and the image side surface is concave;

[0080] The second lens 2 has positive focal power, the object side surface is concave, and the image side surface is convex;

[0081] The third lens 3 has positive focal power, the object side surface is convex, and the image side surface is convex;

[0082] The fourth lens 4 has negative focal power, the object side surface is concave, and the image side surface is concave;

[0083] The fifth lens 5 has positive focal power, the object side surface is convex, and the image side surface is convex;

[0084] The sixth lens 6 has negative focal power, the object side surface is convex, and the image side surface is concave, the sixth lens 6 is a crescent-shaped plastic lens, which increases the image size to 6mm, and realizes a large target of a day and night confocal vehicle-mounted lens;

[0085] The fourth lens 4 and the fifth lens 5 form a cemented lens;

[0086] The second filter 10 is arranged between the sixth lens 6 and the first filter 8;

[0087] The day and night confocal vehicle-mounted lens satisfies the following condition: 0.23 > BFL / TTL > 0.16, wherein BFL is the distance from the center of the image side surface of the sixth lens 6 to the imaging surface of the day and night confocal vehicle-mounted lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens 1 to the imaging surface of the day and night confocal vehicle-mounted lens on the optical axis, which is beneficial to increase the lens optical back focal length and leave sufficient space for the module;

[0088] The day and night confocal vehicle-mounted lens satisfies the following conditions: -3.56 ≤ f1 / f ≤ -1.24, 3.77 ≤ f2 / f ≤ 4.05, 1.72 ≤ f3 / f ≤ 2.22, -1.43 ≤ f4 / f ≤ -1.18, 1.07 ≤ f5 / f ≤ 1.19, and -6.76 ≤ f6 / f ≤ -3.99, wherein f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6, respectively, and f is the focal length of the day and night confocal vehicle-mounted lens, which is beneficial to reduce the assembly sensitivity and control the high and low temperature back focal length drift of the lens within a small range to meet clear imaging;

[0089] The total length of the day and night confocal vehicle-mounted lens is 13, which satisfies the condition that the total length of the day and night confocal vehicle-mounted lens is less than 14.28mm, and realizes the requirement of small size of the lens as a whole;

[0090] The first lens 1 has negative optical power, with a convex object side and a concave image side. The first lens 1 is meniscus-shaped, which facilitates light collection, reduces distortion, and improves image quality. The aperture stop 7 is positioned between the second lens 2 and the third lens 3, which helps reduce the lens aperture. The second lens 2 has positive optical power, with a concave object side and a convex image side, which facilitates smoother reception of refracted light, reduces aberrations, lowers lens sensitivity, and also helps reduce the lens aperture. The third lens 3 is an aspherical lens with positive optical power, which facilitates light refraction and reduces lens length. The fourth lens 4 and the fifth lens 5 are cemented doublet lenses, which help correct chromatic aberration and improve image quality. The sixth lens 6 is a meniscus-shaped negative optical power lens, which helps increase the image plane size, corrects the CRA chip, and achieves a large lens target area. The optical parameters of the day / night confocal vehicle lens provided in Example 2 are shown in Table 3.

[0091] Table 3 shows the optical parameters of the day / night confocal vehicle lens provided in Example 2.

[0092]

[0093] From Table 3, we can observe that when the radius of curvature of aperture 7 is infinite, it indicates that this surface is a plane;

[0094] The first lens 1 has Nd1 of 1.58 and Vd1 of 71.2, satisfying 1.71>Nd1>1.57 and 71.3>Vd1>53.8, where Nd1 refers to the refractive index of the first lens 1 and Vd1 refers to the Abbe number of the first lens 1.

[0095] The third lens 3 has Nd3 of 1.61 and Nd3 of 67.5, satisfying Nd3 > 1.59 and 68.3 > Vd3 > 67.0, where Nd3 refers to the refractive index of the third lens 3 and Vd3 refers to the Abbe number of the third lens 3.

[0096] The first lens 1 is a glass spherical lens, the third lens 3 is a glass aspherical lens, and the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are all plastic aspherical lenses; the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 all satisfy the following conditions:

[0097] z=(cr2) / {1+[1-(k+1)(c2r2)]1 / 2}+A4r4+A6r6+A8r8+A10r10+A12r12+A14r14+A16r16+A18r18+A20r 20(2)

[0099] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspherical coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspherical curve and the optical axis, and z is the aspherical depth (the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane at the vertex of the aspherical optical axis); for convenience, the aspherical surfaces of each lens surface use the aspherical surfaces shown in the above formula (2), however, the present invention is not limited to the aspherical polynomial form represented by formula (2); the coefficients of the aspherical lens surface shape provided in Example 2 are shown in Table 4 below:

[0100] Table 4 shows the coefficients of the surface shape of the aspherical lens provided in Example 2.

[0101]

[0102]

[0103] like Figure 6 As shown, the field curvature and distortion diagram of the day-night confocal vehicle lens provided in this embodiment is as follows: The left figure is the field curvature curve diagram, where the vertical axis of the field curvature curve is the field angle and the horizontal axis is the distance of the image point from the paraxial image plane. T represents the meridional field curvature and S represents the sagittal field curvature. The field curvature curve shows the distance from the current focal plane or image plane to the paraxial focal plane, which is used as a function of the field coordinates. It is divided into meridional field curvature and sagittal field curvature. The right figure is the distortion curve diagram, where the vertical axis of the distortion curve is the field angle and the horizontal axis is the distortion percentage. Distortion belongs to the principal ray aberration and reflects the similarity of the object. The day-night confocal vehicle lens in this specific embodiment has a small optical field curvature, small distortion, and clear image.

[0104] like Figure 7 As shown in the figure, the MTF VS Field curve of the day and night confocal vehicle lens provided in this embodiment is shown. The vertical axis of the MTF VS Field curve is the MTF value, and the horizontal axis is the image point height. The MTF VS Field of the lens reflects the lens's resolving power. The day and night confocal vehicle lens in this specific embodiment has a concentrated curve of 119 LP / mm and a very high MTF value, which can reflect the lens's high resolving power and clear imaging.

[0105] like Figure 8 As shown in the figure, the relative illuminance diagram of the day and night confocal vehicle lens provided in this embodiment is shown. The vertical axis of the relative illuminance diagram is the illuminance value, and the horizontal axis is the field of view. The relative illuminance diagram of the lens reflects the uniformity of the image illuminance of the lens. In this specific embodiment, the day and night confocal vehicle lens has a relative illuminance greater than 0.6 when the maximum field of view is 142°, which reflects that the lens has a high relative illuminance and a better uniformity of image illuminance.

[0106] The day / night co-focus vehicle-mounted lens provided in this embodiment is designed with a wavelength range of 435-656nm plus 940nm to achieve day and night co-focus functionality; it meets the requirements of 5-megapixel imaging, has an optical head size of 6.0mm, and can capture a maximum field of view of up to 142°; the day / night co-focus vehicle-mounted lens has a simple structure and has the advantages of high resolution, large target surface, small size, high relative illumination, and high pixel imaging, which improves the uniformity of illumination and image clarity. Moreover, the smaller lens head size allows for a wider field of view and reduces the production cost of the day / night co-focus vehicle-mounted lens.

[0107] The day-night confocal vehicle lens provided by this invention has the following beneficial effects:

[0108] 1) This invention provides a day and night confocal vehicle-mounted lens, which has a simple structure and advantages such as high resolution, large target area, small size, high relative illumination and high pixel imaging. It improves the uniformity of illumination and image clarity, and the lens head is smaller, which can capture a wider field of view and reduce the production cost of the day and night confocal vehicle-mounted lens.

[0109] 2) This invention provides a day and night confocal vehicle lens, which adopts a combination structure of 1 glass spherical lens, 1 glass aspherical lens and 4 plastic aspherical lenses. Its structure is simple, meets the imaging requirements of 5 million pixels, and has an optical head size of 6.0mm. It has a small lens head size and can shoot a maximum field of view of up to 142°, which is a wider field of view.

[0110] 3) The present invention provides a day and night confocal vehicle-mounted lens, which has high resolution and clear imaging;

[0111] 4) The present invention provides a day and night confocal vehicle lens, which has a small optical field curvature, small distortion, and clear image;

[0112] 5) The present invention provides a day and night confocal vehicle lens, wherein the first lens has negative optical power, its object side is convex and its image side is concave, and the first lens is meniscus, which is beneficial for collecting light and reducing distortion, thereby improving image quality; the aperture stop is set between the second and third lenses, which is beneficial for reducing the lens aperture; the second lens has positive optical power, its object side is concave and its image side is convex, which is beneficial for receiving refracted light more smoothly, reducing aberrations, reducing lens sensitivity, and also beneficial for reducing the lens aperture; the third lens is an aspherical lens with positive optical power, which is beneficial for refracting light and reducing the lens length; the fourth and fifth lenses are cemented doublet lenses, which are beneficial for correcting chromatic aberration and improving image quality; the sixth lens is a meniscus lens with negative optical power, which is beneficial for increasing the image plane size, correcting the CRA chip, and realizing a large target area of ​​the lens;

[0113] 6) The present invention provides a day and night co-focus vehicle lens. When the maximum field of view of the day and night co-focus vehicle lens is 142°, the relative illumination is >0.6, which reflects that the lens has a high relative illumination and a better uniformity of image illumination.

[0114] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by the present invention.

Claims

1. A day and night confocal vehicle lens, characterized in that, The first lens, the second lens, the diaphragm, the third lens, the fourth lens, the fifth lens, the sixth lens, the first filter and the image plane IMA are arranged in sequence along the optical axis direction of incidence; The first lens has negative focal power, the object side surface is convex, and the image side surface is concave; The second lens has positive focal power, the object side surface is concave, and the image side surface is convex; The third lens has positive focal power, the object side surface is convex, and the image side surface is convex; The fourth lens has negative focal power, the object side surface is concave, and the image side surface is concave; The fifth lens has positive focal power, the object side surface is convex, and the image side surface is convex; The sixth lens has negative focal power, and the sixth lens is in a meniscus shape; The fourth lens and the fifth lens form a cemented lens; The day-and-night confocal vehicle-mounted lens satisfies the following conditions: -3.56≤f1 / f≤-1.24, 3.77≤f2 / f≤4.05, 1.72≤f3 / f≤2.22, -1.43≤f4 / f≤-1.18, 1.07≤f5 / f≤1.19, -6.76≤f6 / f≤-3.99, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence, and f is the overall focal length of the day-and-night confocal vehicle-mounted lens.

2. The day and night confocal vehicle lens according to claim 1, wherein, The object side surface of the sixth lens is concave or convex, and the image side surface is convex or concave.

3. The day and night confocal vehicle lens according to claim 1, wherein, The first lens is a glass spherical lens, the third lens is a glass aspherical lens, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspherical lenses.

4. The day and night confocal vehicle lens according to claim 1, wherein, A second filter is arranged between the first lens and the second lens.

5. The day and night confocal vehicle lens according to claim 1, wherein, A second filter is arranged between the sixth lens and the first filter.

6. The day and night confocal vehicle lens according to claim 1, wherein, The first lens satisfies 1.71>Nd1>1.57 and 71.3>Vd1>53.8, wherein Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; the third lens satisfies Nd3>1.59 and 68.3>Vd3>67.0, wherein Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens.

7. The day and night confocal vehicle lens according to claim 1, wherein, The day-and-night confocal vehicle-mounted lens satisfies the following condition: 0.23>BFL / TTL>0.16, wherein BFL is the distance from the center of the image side surface of the sixth lens to the imaging plane of the day-and-night confocal vehicle-mounted lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging plane of the day-and-night confocal vehicle-mounted lens on the optical axis.

8. The day and night confocal vehicle lens according to claim 1, wherein, The total length of the day-and-night confocal vehicle-mounted lens is less than 14.28 mm.

9. The day and night confocal vehicle lens according to claim 1, wherein, When the maximum field angle of the day-and-night confocal vehicle-mounted lens is 142°, the relative luminance is greater than 0.6.

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