Day and night confocal catadioptric lens and image acquisition equipment

Abstract

The invention relates to a day and night confocal refraction and super lens and an image acquisition device, and belongs to the field of optical lenses, the lens has focus consistency in a visible light band and an infrared band, six lenses are sequentially arranged from an object plane to an image plane along an optical axis, at least one lens is a super-surface lens, and the rest lenses are non-super-surface lenses. According to the technical scheme, the volume and weight of the lens of the optical system are reduced, the lens can be conveniently integrated into a day and night confocal system, and miniaturization, light weight and integrated design is achieved.

Description

Technical Field

[0001] This invention belongs to the field of optical lenses, and specifically relates to a day-night confocal superconducting lens and an image acquisition device. Background Technology

[0002] In the fields of security monitoring and automotive applications, cameras require lenses with day and night confocal focusing capabilities, primarily to meet the demand for high-quality imaging in all weather conditions and complex environments. During the day, visible light is the primary light source, while at night, infrared light or low-light environments are relied upon. Security monitoring requires 24 / 7 operation, and image quality cannot be compromised day or night. For automotive cameras used to assist driving (such as reversing cameras, dashcams, ADAS, etc.), nighttime driving safety is paramount. Ordinary lenses have different focal points under visible and infrared light, resulting in slower focusing speeds in low-light conditions, potentially leading to blurry nighttime images and limiting their applicability. Day and night confocal lenses, on the other hand, require no manual adjustment, automatically adapting to changes in lighting to provide clear images at night, helping drivers identify roads and obstacles.

[0003] A day / night confocal lens comprises an optical lens group, aperture mechanism, autofocus mechanism, zoom mechanism, infrared correction mechanism, filter switching mechanism, housing and sealing structure, temperature compensation mechanism, electronic control module, interface and connection components, and auxiliary function modules. These components work together to ensure that the lens provides high-quality imaging results both day and night, adapting to complex lighting and environmental conditions. Among them, the optical lens group is the key component of a day / night confocal lens. Traditional day / night confocal lenses typically have lower resolution in the infrared band than in the visible light band, affecting detail in nighttime imaging. Furthermore, their relatively low illumination results in darker edges, impacting image viewing. Additionally, traditional day / night confocal lenses often use special materials (such as low-dispersion glass) and complex processes, leading to higher manufacturing costs. Summary of the Invention

[0004] This application provides a day-night confocal superconducting lens and an image acquisition device to at least solve the above-mentioned technical problems existing in the prior art.

[0005] One embodiment of this application provides a day and night confocal superconducting lens. The lens has focal consistency in the visible light band and the infrared band. It includes six lenses arranged sequentially from the object plane to the image plane along the optical axis, of which at least one lens is a metasurface lens and the remaining lenses are non-metasurface lenses. The lens satisfies: ; in, The thickness of the metasurface substrate for the day-night confocal superlens, The total length of the optical system For the central field of view MTF Numerical value.

[0006] In one embodiment, the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein at least one of them is a metasurface lens, and the remaining lenses are spherical and aspherical lenses.

[0007] In one embodiment, the sixth lens is a metasurface lens, the first, third, fourth, and fifth lenses are spherical lenses, and the second lens is an aspherical lens.

[0008] In one embodiment, the third and fourth lenses are cemented lenses.

[0009] In one embodiment, the first lens is a lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the first lens are spherical. The second lens is a lens with negative optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the second lens are aspherical. The third lens is a spherical lens with negative optical power, its object-side surface is concave, and its image-side surface is concave; both the object-side and image-side surfaces of the third lens are spherical. The fourth lens is a spherical lens with positive optical power, its object-side surface is convex, and its image-side surface is convex; both the object-side and image-side surfaces of the fourth lens are spherical. The fifth lens is a lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the fifth lens are spherical. The sixth lens is a metasurface lens, its object-side surface is planar, and its image-side surface has a microstructure arrangement.

[0010] In one possible embodiment, the distance from the center of the optical axis on the object-side surface of the first lens to the object surface is L, wherein... 0.3m.

[0011] In one possible implementation, the central field of view of the lens MTF The value is ,in .

[0012] In one possible embodiment, the maximum lens aperture of the lens D satisfy: .

[0013] In one possible implementation, the relative illumination of the lens satisfy: .

[0014] In one possible implementation, the field of view of the lens satisfy: .

[0015] In one possible implementation, an aperture is also included.

[0016] Another embodiment of this application provides an image acquisition device, including any of the day-night confocal superconducting lens and image sensor as described in claims 1-11.

[0017] In one embodiment, the lens has focal consistency in the visible light band and the infrared band, enabling the generation of clear images without focusing in day-night cycles; the device is suitable for vehicle driving assistance systems or security monitoring systems.

[0018] Compared with the prior art, this application has the following advantages: The lens of this application adopts a technical solution that combines metasurface lenses with traditional lenses, which reduces the lens size and weight of the optical system, making it easier to integrate into the day and night confocal system and achieve miniaturization, lightweighting and integration design; This application utilizes superlens technology to achieve high imaging resolution in both visible and infrared light bands, thus realizing high-resolution imaging. This application utilizes a hybrid refractive-superconducting technology to improve the relative illumination of the optical system, enhance edge image clarity, and facilitate image viewing. The manufacturing process of the metasurface in this application is relatively simple, and conventional methods such as photolithography, etching, sputtering, and spraying can be used, which is low in cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the day-night confocal superconducting lens in embodiments 1 and 2 of this application; Figure 2 This is a schematic diagram of the MTF of the day-night confocal superconducting lens in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the blur pattern of the day-night confocal superlens in Embodiment 1 of this application; Figure 4 This is a schematic diagram of the relative illumination of the day-night confocal superlens in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the MTF of the day-night confocal superconducting lens in Embodiment 2 of this application; Figure 6 This is a schematic diagram of the blur pattern of the day-night confocal super-lens in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the relative illumination of the day and night confocal superlens in Embodiment 2 of this application; Explanation of reference numerals in the attached figures: 110. First lens; 120. Second lens; 130. Aperture stop; 140. Third lens; 150. Fourth lens; 160. Fifth lens; 170. Sixth lens; 180. Protective window; 190. Imaging plane. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Metasurfaces consist of periodic or aperiodic micro / nanostructures (such as nanopillars and nanopores), whose dimensions are much smaller than the wavelength of light. By adjusting the shape, size, and arrangement of these micro / nanostructures, the phase, amplitude, and polarization of light waves can be precisely controlled. Metasurface technology breaks through the limitations of traditional optics, providing new pathways for the miniaturization, multifunctionality, and high performance of optical devices. Through optimized design, metasurfaces can operate in the ultraviolet, visible, infrared, and even terahertz wavelength ranges, and can effectively correct aberrations, providing high-quality imaging results. Metasurfaces can be mass-produced using mature semiconductor manufacturing processes (such as photolithography and etching), offering a low-cost advantage. With advancements in manufacturing technology, the manufacturing cost of metasurfaces is expected to decrease further. Based on these advantages, metasurfaces have broad application prospects in imaging, display, communication, and sensing, and are expected to drive revolutionary developments in optical technology in the future.

[0023] The hybrid refractive-hybrid system, which combines metasurface lenses with traditional lenses, can effectively solve the problems existing in traditional day-night confocal lenses. The hybrid refractive-hybrid system can usually achieve optical path folding, thereby achieving the required optical path length in a relatively small optical system. At the same time, it reduces the lens size, which helps to reduce the volume and weight of the optical system. Furthermore, it has high imaging resolution and relative illumination in the visible and infrared light bands, enabling high-quality imaging, while also having a low manufacturing cost.

[0024] This application discloses a day-night confocal superconducting lens, which has focal consistency in the visible light and infrared bands. The lens comprises six lenses arranged sequentially from the object plane to the image plane along the optical axis, of which at least one lens is a metasurface lens and the remaining lenses are non-metasurface lenses. The lens in this embodiment of the application satisfies the following formula: ; in, The thickness of the metasurface substrate for the day-night confocal superlens, The total length of the optical system For the central field of view MTF Numerical value.

[0025] In some embodiments, the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein at least one of them is a metasurface lens, and the remaining lenses are spherical and aspherical lenses.

[0026] In a preferred embodiment, the sixth lens is a metasurface lens, the first, third, fourth, and fifth lenses are spherical lenses, and the second lens is an aspherical lens.

[0027] In this embodiment, the metasurface lens consists of a substrate and micro / nanostructures disposed on the substrate. These micro / nanostructures are composed of subwavelength-scale micro / nano unit arrays, each with a specific shape, size, and arrangement to achieve precise control over the phase, amplitude, or polarization state of the incident light wave. Through the design of these micro / nanostructures, the metasurface lens can achieve optical performance comparable to or even superior to traditional lenses while maintaining a slim and lightweight profile, such as high transmittance, low chromatic aberration, and low distortion. The period of the metasurface's micro / nanostructures ranges from 250 to 400 nm, with an optimal period of 350 nm in this embodiment; the height of the micro / nanostructures ranges from 600 to 1000 nm, with an optimal height of 600 nm in this embodiment; and the diameter of the micro / nanostructures covers 100 to 250 nm, arranged in square, hexagonal, or other shapes.

[0028] As a feasible implementation, the first, third, fourth, and fifth lenses are made of glass, the second lens is made of resin, and the substrate material of the sixth lens includes, but is not limited to, amorphous silicon, crystalline silicon, borosilicate, silicon dioxide, quartz, and glass. The micro / nano structure material of the sixth lens includes, but is not limited to, amorphous silicon, crystalline silicon, silicon dioxide, silicon nitride, and titanium dioxide. By coordinating the materials and the optical power of each lens, a heatless design is achieved, reducing both material costs and system size.

[0029] In a preferred embodiment, the third lens and the fourth lens are cemented lenses.

[0030] Furthermore, in some embodiments, the first lens is a lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the first lens are spherical. The second lens is a lens with negative optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the second lens are aspherical. The third lens is a spherical lens with negative optical power, its object-side surface is concave, and its image-side surface is concave; both the object-side and image-side surfaces of the third lens are spherical. The fourth lens is a spherical lens with positive optical power, its object-side surface is convex, and its image-side surface is convex; both the object-side and image-side surfaces of the fourth lens are spherical. The fifth lens is a lens with positive optical power, its object-side surface is convex, and its image-side surface is concave; both the object-side and image-side surfaces of the fifth lens are spherical. The sixth lens is a metasurface lens, its object-side surface is planar, and its image-side surface has a microstructure arrangement.

[0031] In some embodiments, the distance from the center of the optical axis on the object-side surface of the first lens to the object surface is L, where 0.3m.

[0032] Based on the above scheme, the center field of view of the lens MTF The value is ,in .

[0033] Based on the above solutions, the maximum lens aperture... D satisfy: .

[0034] Based on the above scheme, the relative illumination of the lens satisfy: .

[0035] In some embodiments, the field of view of the lens satisfy: .

[0036] In a preferred embodiment, any of the above lenses includes an aperture stop. The aperture stop is positioned before the first lens, after the sixth lens, or between any two lenses.

[0037] This application provides two day-night confocal hyperfocal lenses that meet usage requirements in two exemplary embodiments. The day-night confocal hyperfocal lenses provided in the two specific embodiments of this application will be described in detail below. Example

[0038] For example, Table 1 details the specific optical data parameters of each lens in the day-night confocal superlens provided in this embodiment of the invention, using a feasible implementation method. The optical data parameters in Table 1 correspond to... Figure 1 The day-night confocal superlens shown.

[0039] Figure 1This is a schematic diagram of the structure of a day / night confocal superconducting lens under normal temperature conditions, provided by an embodiment of the present invention. Figure 1 As shown, the day-night confocal superconducting lens provided in this embodiment of the invention includes a first lens 110, a second lens 120, an aperture 130, a third lens 140, a fourth lens 150, a fifth lens 160, and a sixth lens 170 arranged sequentially along the optical axis from the object plane to the image plane.

[0040] The incident light enters through the object side of the first lens 110, passes through the second lens 120, then through the aperture 130, the third lens 140, the fourth lens 150, the fifth lens 160 and the sixth lens 170, passes through the protective window 180, and finally converges on the imaging surface 190.

[0041] Simultaneously setting the lens to meet The day / night confocal superconducting lens has a relatively small optical lens size, and the maximum effective aperture of the lens meets the requirements. Furthermore, the day-night confocal superfocal lens has high resolution in both visible and infrared light, and the imaging quality in the center field of view meets the requirements. At the same time, the relative illuminance meets .

[0042] Among them, the first lens 110 is a lens with positive optical power and its object-side surface is convex; the second lens 120 is a lens with negative optical power and its object-side surface is convex, and both its object-side surface and image-side surface are aspherical; the third lens 140 is a spherical lens with negative optical power and its object-side surface and image-side surface are concave; the fourth lens 150 is an aspherical lens with positive optical power and its object-side surface and image-side surface are convex; the fifth lens 160 is a spherical lens with positive optical power and both its object-side surface and image-side surface are spherical; the sixth lens 170 is a metasurface lens; the third lens 140 and the fourth lens 150 are cemented doublet lenses; and the aperture stop 130 is located after the second lens 120.

[0043] Table 1

[0044] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number 1 represents the object surface, surface number 2 represents the object side surface of the first lens 110, surface number 3 represents the image side surface of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface. A positive value means that the surface bends towards the image surface, and a negative value means that the surface bends towards the object surface. "Infinity" indicates that the surface is flat. The spacing represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the spacing are millimeters (mm).

[0045] Its even-order aspherical surface shape satisfies the following equation: Where z is the distance from the even-order aspherical surface to its vertex along the optical axis, r is the height from the optical axis, c is the curvature 1 / R, R is the radius of curvature at the vertex of the lens, k is the conic coefficient -e2, and a2, a3, a4, a5, and a6 are the higher-order coefficients of the aspherical surface.

[0046] For example, Table 2 details the conic coefficient k and higher-order coefficients a2, a3, a4, a5, a6 of the aspherical lens surface in this embodiment according to a feasible implementation.

[0047] Table 2

[0048] Among them, 8.22E-003 means that the coefficient a2 of the face number 4 is 8.22E-003, and so on.

[0049] For example, Table 3 details the phase of the metasurface in this embodiment with a feasible implementation method.

[0050] Table 3

[0051] Where R1 is the normalized radius of the binary surface.

[0052] In this embodiment, the metasurface substrate thickness, total optical length, and central field of view MTF satisfy the following conditions: The optical object distance satisfies =0.65m; the central field of view MTF value satisfies The maximum effective lens diameter meets the requirements. The field of view satisfies ; The day-night confocal lens provided in this embodiment operates in the visible light 436-656nm and infrared light 940nm bands, with an Fno of 2.2. The visible light and infrared light are confocal, meeting the usage requirements of a day-night confocal lens.

[0053] Figure 2 This is a schematic diagram of the MTF of the day-night confocal lens provided in an embodiment of the present invention. The day-night confocal lens provided in this embodiment of the present invention has high resolution and can meet the high-quality imaging requirements of day-night confocal.

[0054] Figure 3 This is a schematic diagram of the blur pattern of the day and night confocal lens provided in an embodiment of the present invention. The day and night confocal superfocal lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed blur pattern across the entire long wavelength band, which can meet the requirements of high-resolution imaging.

[0055] Figure 4This is a schematic diagram of the relative illumination of a day / night confocal lens provided in an embodiment of the present invention, which represents the relative illumination values ​​corresponding to different fields of view, such as... Figure 4 As shown, the day and night confocal lens provided in this embodiment of the invention has a relative illuminance of more than 70% and uniform brightness across the entire field of view in the working band. Example

[0057] For example, Table 4 details the specific optical data parameters of each lens in the day-night confocal superlens provided in this embodiment of the invention, according to a feasible implementation. The optical data parameters in Table 4 correspond to... Figure 1 The day-night confocal superlens shown.

[0058] Figure 1 This is a schematic diagram of the structure of a day / night confocal superconducting lens under normal temperature conditions, provided by an embodiment of the present invention. Figure 1 As shown, the day-night confocal superconducting lens provided in this embodiment of the invention includes a first lens 110, a second lens 120, an aperture 130, a third lens 140, a fourth lens 150, a fifth lens 160, and a sixth lens 170 arranged sequentially along the optical axis from the object plane to the image plane.

[0059] The incident light enters through the object side of the first lens 110, passes through the second lens 120, then through the aperture 130, the third lens 140, the fourth lens 150, the fifth lens 160 and the sixth lens 170, passes through the protective window 180, and finally converges on the imaging surface 190.

[0060] Simultaneously setting the lens to meet The day / night confocal superconducting lens has a relatively small optical lens size, and the maximum effective aperture of the lens meets the requirements. Furthermore, the day-night confocal superfocal lens has high resolution in both visible and infrared light, and the imaging quality in the center field of view meets the requirements. At the same time, the relative illuminance meets .

[0061] Among them, the first lens 110 is a lens with positive optical power and its object-side surface is convex; the second lens 120 is a lens with negative optical power and its object-side surface is convex, and both its object-side surface and image-side surface are aspherical; the third lens 140 is a spherical lens with negative optical power and its object-side surface and image-side surface are concave; the fourth lens 150 is an aspherical lens with positive optical power and its object-side surface and image-side surface are convex; the fifth lens 160 is a spherical lens with positive optical power and both its object-side surface and image-side surface are spherical; the sixth lens 170 is a metasurface lens; the third lens 140 and the fourth lens 150 are cemented doublet lenses; and the aperture stop 130 is located after the second lens 120.

[0062] Table 4

[0063] The surface number is assigned according to the order of the surfaces of each lens. For example, surface number 1 represents the object surface, surface number 2 represents the object side surface of the first lens 110, surface number 3 represents the image side surface of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface. A positive value means that the surface bends towards the image surface, and a negative value means that the surface bends towards the object surface. "Infinity" indicates that the surface is flat. The spacing represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the spacing are millimeters (mm).

[0064] Its even-order aspherical surface shape satisfies the following equation: Where z is the distance from the even-order aspherical surface to its vertex along the optical axis, r is the height from the optical axis, c is the curvature 1 / R, R is the radius of curvature at the vertex of the lens, k is the conic coefficient -e2, and a2, a3, a4, a5, and a6 are the higher-order coefficients of the aspherical surface.

[0065] For example, Table 5 details the conic coefficient k and higher-order coefficients a2, a3, a4, a5, a6 of the aspherical lens surface in this embodiment according to a feasible implementation.

[0066] Table 5

[0067] Among them, 5.76E-003 means that the coefficient a2 of the face number 4 is 5.76E-003, and so on.

[0068] For example, Table 6 details the phase of the metasurface in this embodiment with a feasible implementation.

[0069] Table 6

[0070] Where R1 is the normalized radius of the binary surface.

[0071] The metasurface substrate thickness, total optical length, and central field of view MTF satisfy the following conditions: The optical object distance satisfies =10.00m; the central field of view MTF value satisfies The maximum effective lens diameter meets the requirements. The field of view satisfies ; The day-night confocal lens provided in this embodiment operates in the visible light 436-656nm and infrared light 940nm bands, with an Fno of 2.2. The visible light and infrared light are confocal, meeting the usage requirements of a day-night confocal lens.

[0072] Figure 5 This is a schematic diagram of the MTF of the day-night confocal lens provided in an embodiment of the present invention. The day-night confocal lens provided in this embodiment of the present invention has high resolution and can meet the high-quality imaging requirements of day-night confocal.

[0073] Figure 6 This is a schematic diagram of the blur pattern of the day and night confocal lens provided in an embodiment of the present invention. The day and night confocal superfocal lens provided in this embodiment of the present invention has a relatively concentrated and uniformly distributed blur pattern across the entire long wavelength band, which can meet the requirements of high-resolution imaging.

[0074] Figure 7 This is a schematic diagram of the relative illumination of a day / night confocal lens provided in an embodiment of the present invention, which represents the relative illumination values ​​corresponding to different fields of view, such as... Figure 7 As shown, the day and night confocal lens provided in this embodiment of the invention has a relative illuminance of more than 73% in the entire field of view and uniform brightness in the working band.

[0075] In summary, the day-night confocal lens provided in this embodiment of the invention is small in size, low in cost, has high relative illumination, and produces clear images, thus meeting the requirements for high-quality imaging and lightweight integration.

[0076] Example 1 and Example 2 respectively satisfy the relationships shown in Table 7 below: Table 7

[0077] This application also discloses an image acquisition device, including any of the day / night confocal superconducting lenses and image sensors described above. The day / night confocal superconducting lens has focal consistency in both the visible and infrared bands, enabling the generation of clear images without focusing in day-night alternation environments. The image acquisition device is suitable for vehicle-mounted driver assistance systems or security monitoring systems.

[0078] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A day-night confocal superfocal lens, characterized in that, The lens has focal consistency in the visible light band and the infrared band. It includes six lenses arranged sequentially from the object plane to the image plane along the optical axis, of which at least one lens is a metasurface lens and the rest are non-metasurface lenses. The lens satisfies: ； in, The thickness of the metasurface substrate for the day-night confocal superlens, The total length of the optical system, For the central field of view MTF Numerical value.

2. The day / night confocal superconducting lens according to claim 1, characterized in that, The lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein at least one of them is a metasurface lens, and the remaining lenses are spherical and aspherical lenses.

3. The day / night confocal superconducting lens according to claim 2, characterized in that: The sixth lens is a metasurface lens, the first, third, fourth, and fifth lenses are spherical lenses, and the second lens is an aspherical lens.

4. The day / night confocal superconducting lens according to claim 3, characterized in that: The third and fourth lenses are cemented lenses.

5. A day / night confocal superconducting lens according to claim 3, characterized in that: The first lens is a lens with positive optical power, with its object side being convex and its image side being concave; both the object side and the image side of the first lens are spherical. The second lens is a lens with negative optical power, with a convex object side and a concave image side. Both the object side and the image side of the second lens are aspherical. The third lens is a spherical lens with negative optical power, its object side is concave, its image side is concave, and both the object side and image side of the third lens are spherical. The fourth lens is a spherical lens with positive optical power, and its object-side surface is convex, and its image-side surface is convex; both the object-side surface and the image-side surface of the fourth lens are spherical. The fifth lens is a lens with positive optical power, its object side is convex and its image side is concave, and both the object side and the image side of the fifth lens are spherical. The sixth lens is a metasurface lens, with a flat object side and a microstructure arrangement on the image side.

6. A day / night confocal superconducting lens according to claim 2, characterized in that, The distance from the center of the optical axis on the object-side surface of the first lens to the object surface is L, where 0.3m.

7. A day / night confocal superconducting lens according to claim 1, characterized in that, The center field of view of the lens MTF The value is ,in .

8. A day / night confocal superconducting lens according to claim 1, characterized in that, The maximum lens diameter of the lens D satisfy: .

9. A day / night confocal superconducting lens according to claim 1, characterized in that, The relative illumination of the lens satisfy: .

10. A day / night confocal superconducting lens according to claim 1, characterized in that, The field of view of the lens satisfy: .

11. A day / night confocal superconducting lens according to claim 1, characterized in that, It also includes the aperture.

12. An image acquisition device, characterized in that, Includes any of the day / night confocal superconducting lens and image sensor as described in claims 1-11.

13. The image acquisition device according to claim 12, characterized in that: The lens has focal consistency in the visible light band and the infrared band, which is used to generate clear images without focusing in day and night environments; The device is suitable for vehicle-mounted driver assistance systems or security monitoring systems.

Images