Folding and super hybrid long-focus day and night confocal lens and image acquisition equipment

Abstract

The invention relates to a refraction-super hybrid long-focus day and night confocal lens and an image acquisition device, and belongs to the field of optical lenses. The long-focus day and night confocal lens has focus consistency in a visible light band and an infrared band; comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis; at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens is a metasurface lens, and the other lenses are spherical lenses. By adopting the technical scheme of folding and super mixing, large-target-surface day and night common-focal-length imaging is realized, the use of glued lenses is reduced, the complexity of the system is reduced, the assembly difficulty is reduced, and the risk that a structural member generates stray light is reduced.

Description

Technical Field

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

[0002] Day and night confocal imaging refers to imaging technology that can achieve simultaneous focusing in both the visible and near-infrared wavelengths. This technology enables high-definition, high-quality imaging both day and night using only a single lens without the need for refocusing, significantly reducing the complexity of optical systems and equipment costs. Due to its representative imaging characteristics, it is widely used in automotive, security, and drone applications. However, because of its specific wide-spectrum imaging requirements, traditional imaging lens designs often require more refractive elements and special, often expensive, high-dispersion glass lenses. Furthermore, with the increasing demand for long-distance applications, the need for telephoto lenses has become an inevitable development trend. Summary of the Invention

[0003] This application provides a hybrid telephoto day / night confocal lens and an image acquisition device to at least solve the above-mentioned technical problems existing in the prior art.

[0004] One embodiment of this application provides a hybrid telephoto day / night confocal lens with refractive and hyperfocal properties. The telephoto day / night confocal lens has focal consistency in the visible light and infrared bands, and includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object plane to the image plane; at least one of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens is a metasurface lens, and the remaining lenses are spherical lenses;

[0005] The telephoto day / night confocal lens satisfies the following:

[0006] -0.015≤bfl1-bfl2≤0.015;

[0007]

[0008] Wherein, bfl1 is the optical back focal length of the lens in the visible light band, bfl2 is the optical back focal length of the lens in the near-infrared band, TTL is the distance from the center of the optical axis on the object side of the first lens to the image plane, and EFL is the focal length.

[0009] In one embodiment, the fourth lens is a metasurface lens, and the remaining lenses are spherical lenses.

[0010] 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 surface and the image-side surface of the first lens are spherical.

[0011] The second 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 second lens are spherical.

[0012] The third lens is a lens with positive optical power, with its object side and image side being concave. Both the object side and image side of the third lens are spherical.

[0013] The fourth lens is a lens with negative optical power, with a concave object side and a convex image side. Both the object side and the image side of the fourth lens are spherical.

[0014] 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.

[0015] The sixth lens is a metasurface lens with negative optical power, its object side is flat, and its image side has microstructures arranged.

[0016] The seventh lens is a lens with negative optical power, its object side is concave and its image side is convex, and both the object side and the image side of the seventh lens are spherical.

[0017] The eighth lens is a lens with positive optical power, and its object side is convex, its image side is convex, and both the object side and image side of the eighth lens are spherical.

[0018] In one embodiment, the fourth and fifth lenses are cemented lenses.

[0019] In one embodiment, a ninth lens is also included, which is a protective glass.

[0020] In one embodiment, an aperture stop is also included, which is disposed in front of the first lens or in the optical path between any two lenses.

[0021] In one embodiment, the focal length f of the telephoto day-night confocal lens satisfies f≥37mm.

[0022] In one possible implementation, the field of view (FOV) of the telephoto day / night confocal lens satisfies FOV ≥ 15°.

[0023] In one embodiment, the aperture number F# of the telephoto day / night confocal lens satisfies F#<2.8.

[0024] Another embodiment of this application provides an image acquisition device, including any of the telephoto day / night confocal lenses and image sensors as described above.

[0025] In one embodiment, the telephoto day-night confocal lens has focal consistency in the visible light 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, security, and drone applications. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the telephoto day-night confocal lens in Embodiment 1 of this application;

[0027] Figure 2 This is a schematic diagram of the visible light MTF of the telephoto day-night confocal lens in Embodiment 1 of this application;

[0028] Figure 3 This is a schematic diagram of the near-infrared MTF of the telephoto day-night confocal lens in Embodiment 1 of this application;

[0029] Figure 4 This is a schematic diagram of the visible light diffusion pattern of the telephoto day-night confocal lens in Embodiment 1 of this application;

[0030] Figure 5 This is a schematic diagram of the near-infrared diffusion spot of the telephoto day and night confocal lens in Embodiment 1 of this application;

[0031] Figure 6 This is a schematic diagram of the relative illumination of the telephoto day and night confocal lens in Embodiment 1 of this application;

[0032] Figure 7 This is a schematic diagram of the telephoto day and night confocal lens in Embodiment 2 of this application;

[0033] Figure 8 This is a schematic diagram of the visible light MTF of the telephoto day-night confocal lens in Embodiment 2 of this application;

[0034] Figure 9 This is a schematic diagram of the near-infrared MTF of the telephoto day-night confocal lens in Embodiment 2 of this application;

[0035] Figure 10 This is a schematic diagram of the visible light diffusion pattern of the telephoto day-night confocal lens in Embodiment 2 of this application;

[0036] Figure 11 This is a schematic diagram of the near-infrared diffusion pattern of the telephoto day-night confocal lens in Embodiment 2 of this application;

[0037] Figure 12 This is a schematic diagram of the relative illumination of the telephoto day and night confocal lens in Embodiment 2 of this application;

[0038] Explanation of reference numerals in the attached figures:

[0039] 110. First lens; 120. Aperture stop; 130. Second lens; 140. Third lens; 150. Fourth lens; 160. Fifth lens; 170. Sixth lens; 180. Seventh lens; 190. Eighth lens; 200. Ninth lens; 210. Imaging plane. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings.

[0041] 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.

[0042] Traditional optical materials are used to design day and night confocal lenses that cover both visible and near-infrared wavelengths. This often requires more lenses to aberrate the light. The increased number of lenses makes the optical system more complex and requires more structural support components such as spacers. This not only increases the difficulty of lens assembly but also increases the risk of stray light and ghosting.

[0043] Similarly, due to the requirement of achromatic aberration, traditional optical materials usually require expensive glass with special properties such as FK and ZPK series, and often use multiple cemented lenses, which increases the material cost of the system.

[0044] In addition, the requirements of telephoto lenses usually mean a larger overall length, which is a major problem in the context of traditional lens design.

[0045] A metasurface is an artificial material with a thickness smaller than the wavelength, composed of a series of micrometer-scale two-dimensional structural units. The fabrication process of metasurfaces is relatively simple, employing conventional methods such as photolithography, sputtering, and spraying, resulting in low cost. By rationally designing metasurfaces, light field information can be collected, thereby obtaining images of objects. Metasurfaces control the phase, amplitude, and propagation direction of light through control unit structures (usually nanoscale structural units), thus achieving the purpose of manipulating light waves. Furthermore, the dispersion of metasurfaces differs significantly from that of traditional optical materials. Traditional optical materials exhibit greater dispersion in the short wavelength range and less dispersion in the long wavelength range, while metasurfaces exhibit the opposite, thus facilitating the correction of second-order spectra. In addition, the Abbe number of metasurfaces has the opposite sign to the dispersion value of traditional optical materials, which also benefits the correction of chromatic aberration.

[0046] Combining the optical properties of traditional optical materials and metasurfaces makes hybrid optical systems with refractive and metasurface properties highly promising for applications in the broad spectrum imaging band, especially in long-focal-length day-night confocal applications.

[0047] Figure 1 This is a schematic diagram of the structure of a hybrid telephoto day / night confocal lens provided in an embodiment of the present invention under normal temperature conditions. This telephoto day / night confocal lens exhibits focal consistency in both the visible and infrared bands. Figure 1 As shown in the figure, an embodiment of the present invention provides a telephoto day / night confocal lens with hybrid refractive and superfocal focusing, comprising a first lens 110, an aperture stop 120, a second lens 130, a third lens 140, a fourth lens 150, a fifth lens 160, a sixth lens 170, a seventh lens 180, an eighth lens 190, and a ninth lens 200 arranged sequentially along the optical axis from the object plane to the image plane. The day / night confocal lens is configured to satisfy -0.015≤bfl1-bfl2≤0.015 to achieve clear imaging both day and night; and the Fno of the day / night confocal lens is ≤2.8 to ensure sufficient light intake at night and clear imaging even in low-light conditions; where Fno is the aperture number, bfl1 is the optical back focal length in the visible light band, and bfl2 is the optical back focal length in the near-infrared band (830nm~870nm).

[0048] As a possible implementation, at least one of the first lens 110, the second lens 130, the third lens 140, the fourth lens 150, the fifth lens 160, the sixth lens 170, the seventh lens 180, and the eighth lens 190 is a metasurface lens, and the ninth lens 200 is a protective glass.

[0049] Among them, metasurface lenses have the function of achromatic correction. By setting at least one lens in a large target surface visible light refractive-hybrid system as a metasurface lens, chromatic aberration can be effectively corrected. Especially in systems with strong requirements for chromatic aberration correction, such as day and night confocal systems, clear imaging effect can be achieved day and night confocal.

[0050] As a feasible implementation, the sixth lens 170 is configured as a metasurface lens, with its object side being a plane and its image side having a microstructure arrangement.

[0051] Metasurface lenses consist of a substrate and micro / nanostructures mounted on it. 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 incident light waves. Through the design of these micro / nanostructures, metasurface lenses can achieve optical performance comparable to or even superior to traditional lenses, such as high transmittance, low chromatic aberration, and low distortion, while maintaining a slim and lightweight design.

[0052] like Figure 1As shown, the incident light enters through the object side of the first lens 110, passes through the aperture 120, then through the second lens 130 and the third lens 140, and then through the fourth lens 150, the fifth lens 160, the sixth lens 170, the seventh lens 180 and the eighth lens 190 before converging on the imaging surface 210.

[0053] Example 1

[0054] Table 1 shows the parameters of a hybrid telephoto day / night confocal lens provided in Example 1.

[0055] Table 1

[0056]

[0057] Figure 1 This is a schematic diagram of the structure of a hybrid telephoto day / night confocal lens provided in an embodiment of the present invention under normal temperature conditions, as shown below. Figure 1 As shown in the figure, an embodiment of the present invention provides a telephoto day / night confocal lens with hybrid refractive and superfocal focusing, comprising a first lens 110, an aperture stop 120, a second lens 130, a third lens 140, a fourth lens 150, a fifth lens 160, a sixth lens 170, a seventh lens 180, an eighth lens 190, and a ninth lens 200 arranged sequentially along the optical axis from the object plane to the image plane. The day / night confocal lens is configured to satisfy -0.015≤bfl1-bfl2≤0.015 to achieve clear imaging both day and night; and the Fno of the day / night confocal lens is ≤2.8 to ensure sufficient light intake at night and clear imaging even in low-light conditions; where Fno is the aperture number, bfl1 is the optical back focal length in the visible light band, and bfl2 is the optical back focal length in the near-infrared band (830nm~870nm).

[0058] In this embodiment, the first lens 110, the second lens 130, the third lens 140, the fourth lens 150, the fifth lens 160, the sixth lens 170, the seventh lens 180, and the eighth lens 180 are all made of glass, and all of them are spherical glass.

[0059] The first lens 110 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 110 are spherical. The second lens 130 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 second lens 130 are spherical. The third lens 140 is a lens with positive optical power, its object-side surface is concave, and its image-side surface is convex; both the object-side and image-side surfaces of the third lens 140 are spherical. The fourth lens 150 is a 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 fourth lens 150 are spherical. The fifth lens 160... The fifth lens 160 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 160 are spherical. The sixth lens 170 is a metasurface lens with negative optical power, its object-side surface is planar, and its image-side surface has microstructures. The seventh lens 180 is a lens with negative optical power, its object-side surface is concave, and its image-side surface is convex. Both the object-side and image-side surfaces of the seventh lens 180 are spherical. The eighth lens 190 is a lens with negative optical power, its object-side surface is concave, and its image-side surface is convex. Both the object-side and image-side surfaces of the eighth lens 190 are spherical. The ninth lens 200 is a protective glass that protects the sensor.

[0060] For example, Table 2 details the specific optical data parameters of each lens in a hybrid telephoto day / night confocal lens provided in this embodiment of the invention, using a feasible implementation method. The optical data parameters in Table 2 correspond to... Figure 1 The image shows a telephoto lens with a hybrid superfocal distance and day / night focus.

[0061] Table 2

[0062]

[0063] The surface numbers are assigned according to the order of the surfaces of each lens. For example, surface number 1 represents the object-side surface of the first lens 110, surface number 2 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 indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. The value is "Infinity".

[0064] This indicates that the surface is planar; the spacing represents the central axial distance from the current surface to the next surface. The units for both the radius of curvature and the spacing are millimeters (mm).

[0065] For example, Table 4 details the phase of the metasurface in this embodiment with a feasible implementation.

[0066] Table 4

[0067]

[0068]

[0069] Where R1 is the normalized radius of the binary surface.

[0070] The telephoto day and night confocal lens provided in this embodiment operates in the visible and near-infrared bands, has an F-number of 2.8, a focal length of 38mm, and a maximum field of view of 15.6°.

[0071] Figure 2 The MTF curve of the telephoto day-night confocal lens in this embodiment is shown in the visible light band. At a frequency of 160 lp / mm, the MTF at 0 field of view is >0.6, indicating good imaging performance.

[0072] Figure 3 The MTF curve of the telephoto day / night confocal lens in this embodiment is shown in the near-infrared band. At a frequency of 160 lp / mm, the MTF at 0 field of view is >0.4, indicating good imaging performance.

[0073] Figure 4 This is a schematic diagram of the blur pattern in the visible light band for the telephoto day / night confocal lens provided in this embodiment. Figure 4 As can be seen, the telephoto day and night confocal lens provided in this embodiment of the invention has a relatively concentrated and uniformly distributed diffusion pattern across the entire long wavelength band, which can meet the requirements of high-resolution imaging.

[0074] Figure 5 This is a schematic diagram of the blur pattern in the near-infrared band for the telephoto day / night confocal lens provided in this embodiment. Figure 5 As can be seen, the telephoto day and night confocal lens provided in this embodiment of the invention has a relatively concentrated and uniformly distributed diffusion pattern across the entire long wavelength band, which can meet the requirements of high-resolution imaging.

[0075] Figure 6 This is a schematic diagram of the relative illumination of the telephoto day / night confocal lens provided in this embodiment, which represents the relative illumination values ​​corresponding to different fields of view, such as... Figure 6 As shown, the telephoto day and night confocal lens provided in this embodiment of the invention has a relative illumination greater than 80% in the working band.

[0076] Example 2

[0077] Table 5 shows the parameters of a telephoto day / night cofocal lens with a super-refractive structure provided in Example 2.

[0078] Figure 5

[0079]

[0080] Figure 7This is a schematic diagram of the structure of a hybrid telephoto day / night confocal lens provided in an embodiment of the present invention under normal temperature conditions, as shown below. Figure 7 As shown in the figure, an embodiment of the present invention provides a telephoto day / night confocal lens with hybrid refractive and superfocal focusing, comprising a first lens 110, an aperture stop 120, a second lens 130, a third lens 140, a fourth lens 150, a fifth lens 160, a sixth lens 170, a seventh lens 180, an eighth lens 190, and a ninth lens 200 arranged sequentially along the optical axis from the object plane to the image plane. The day / night confocal lens is configured to satisfy -0.015≤bfl1-bfl2≤0.015 to achieve clear imaging both day and night; and the Fno of the day / night confocal lens is ≤2.8 to ensure sufficient light intake at night and clear imaging even in low-light conditions; where Fno is the aperture number, bfl1 is the optical back focal length in the visible light band, and bfl2 is the optical back focal length in the near-infrared band (830nm~870nm).

[0081] In this embodiment, the first lens 110, the second lens 130, the third lens 140, the fourth lens 150, the fifth lens 160, the sixth lens 170, the seventh lens 180, and the eighth lens 180 are all made of glass, and all of them are spherical glass.

[0082] The first lens 110 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 110 are spherical. The second lens 130 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 second lens 130 are spherical. The third lens 140 is a lens with positive optical power, its object-side surface is concave, and its image-side surface is convex; both the object-side and image-side surfaces of the third lens 140 are spherical. The fourth lens 150 is a 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 fourth lens 150 are spherical. The fifth lens 160... The fifth lens 160 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 160 are spherical. The sixth lens 170 is a metasurface lens with negative optical power, its object-side surface is planar, and its image-side surface has microstructures. The seventh lens 180 is a lens with negative optical power, its object-side surface is concave, and its image-side surface is convex. Both the object-side and image-side surfaces of the seventh lens 180 are spherical. The eighth lens 190 is a lens with negative optical power, its object-side surface is concave, and its image-side surface is convex. Both the object-side and image-side surfaces of the eighth lens 190 are spherical. The ninth lens 200 is a protective glass that protects the sensor.

[0083] For example, Table 6 details the specific optical data parameters of each lens in a hybrid telephoto day / night confocal lens provided in this embodiment of the invention, using a feasible implementation method. The optical data parameters in Table 6 correspond to... Figure 7 The image shows a telephoto lens with a hybrid superfocal distance and day / night focus.

[0084] Table 6

[0085]

[0086]

[0087] For the analysis of each surface in Table 6, please refer to Example 1. This example will not analyze it further.

[0088] For example, Table 7 details the phase of the metasurface in this embodiment with a feasible implementation.

[0089] Table 7

[0090] Face number R1 A1 A2 A3 A4 A5 9 1.00E+00 -3.64E+02 6.11E+00 -1.34E+00 3.04E-01 -3.96E-02 Face number A6 A7 A8 A9 A10 9 2.21E-03 6.57E-05 -1.70E-05 9.07E-07 -1.65E-08

[0091] Where R1 is the normalized radius of the binary surface.

[0092] The telephoto day and night confocal lens provided in this embodiment operates in the visible and near-infrared bands, has an F-number of 2.8, a focal length of 37.9, and a maximum field of view of 15°.

[0093] Figure 8 The MTF curve of the telephoto day-night confocal lens in this embodiment is shown in the visible light band. At a frequency of 160 lp / mm, the MTF at 0 field of view is >0.6, indicating good imaging performance.

[0094] Figure 9 The MTF curve of the telephoto day / night confocal lens in this embodiment is shown in the near-infrared band. At a frequency of 160 lp / mm, the MTF at 0 field of view is >0.4, indicating good imaging performance.

[0095] Figure 10 This is a schematic diagram of the blur pattern in the visible light band for the telephoto day / night confocal lens provided in this embodiment. Figure 10 As can be seen, the telephoto day and night confocal lens provided in this embodiment of the invention has a relatively concentrated and uniformly distributed diffusion pattern across the entire long wavelength band, which can meet the requirements of high-resolution imaging.

[0096] Figure 11 This is a schematic diagram of the blur pattern of the telephoto day-night confocal lens provided in this embodiment in the near-infrared band. The hybrid day-night confocal lens provided in this embodiment of the invention has a relatively concentrated and uniformly distributed blur pattern throughout the long wavelength band, which can meet the requirements of high-resolution imaging.

[0097] Figure 12 This is a schematic diagram of the relative illumination of the telephoto day / night confocal lens provided in this embodiment, which represents the relative illumination values ​​corresponding to different fields of view, such as... Figure 12 As shown, the telephoto day and night confocal lens provided in this embodiment of the invention has a relative illumination greater than 80% in the working band.

[0098] In summary, the hybrid telephoto day / night cofocal lens provided in this embodiment of the invention has fewer lens elements, a larger aperture, higher image quality, and lower cost.

[0099] This application also provides an image acquisition device, including any of the above-mentioned telephoto day / night confocal lenses and image sensors.

[0100] The telephoto day / night confocal lens features focus consistency in both the visible and infrared bands, enabling the generation of clear images without refocusing in day-night environments. The image acquisition equipment is suitable for vehicle-mounted, security, and drone applications.

[0101] 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 folded super-compact long-telephoto day-night confocal lens, characterized in that, The long-focus day-and-night confocal lens has focal point consistency in the visible light waveband and the infrared waveband, and comprises, in sequence from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. At least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is a super surface lens, and the rest are spherical surface lenses. The long-focus day-and-night confocal lens satisfies: -0.015≤bfl1-bfl2≤0.

015. Wherein, bfl1 is the optical back focal length of the lens in the visible light waveband, bfl2 is the optical back focal length of the lens in the near-infrared waveband, TTL is the distance from the optical axis center of the object side of the first lens to the image plane, and EFL is the focal length.

2. The long focal day-night confocal lens according to claim 1, characterized in that: The fourth lens is a super surface lens, and the rest are spherical surface lenses.

3. The long tele day and night confocal lens according to claim 2, characterized in that: The first lens is a lens with positive refractive power, the object side of which is a convex surface, and the image side of which is a concave surface; the object side and the image side of the first lens are both spherical surfaces. The second lens is a lens with positive refractive power, the object side of which is a convex surface, and the image side of which is a concave surface; the object side and the image side of the second lens are both spherical surfaces. The third lens is a lens with positive refractive power, the object side of which is a concave surface, and the image side of which is a concave surface; the object side and the image side of the third lens are both spherical surfaces. The fourth lens is a lens with negative refractive power, the object side of which is a concave surface, and the image side of which is a convex surface; the object side and the image side of the fourth lens are both spherical surfaces. The fifth lens is a lens with positive refractive power, the object side of which is a convex surface, and the image side of which is a concave surface; the object side and the image side of the fifth lens are both spherical surfaces. The sixth lens is a super surface lens with negative refractive power, the object side of which is a plane, and the image side of which has a microstructure arrangement. The seventh lens is a lens with negative refractive power, the object side of which is a concave surface, and the image side of which is a convex surface; the object side and the image side of the seventh lens are both spherical surfaces. The eighth lens is a lens with positive refractive power, the object side of which is a convex surface, and the image side of which is a convex surface; the object side and the image side of the eighth lens are both spherical surfaces.

4. The long focal day-night confocal lens according to claim 3, characterized in that: The fourth lens and the fifth lens are cemented lenses.

5. The long focal day-night confocal lens according to claim 1, characterized in that: A ninth lens is further included, which is a protective glass.

6. The long focal day-night confocal lens of claim 1, wherein: A diaphragm is further included, which is arranged in the light path before the first lens or between any two lenses.

7. The long focal day-night confocal lens of claim 1, wherein: The focal length f of the long-focus day-and-night confocal lens satisfies f≥37mm.

8. The long focal day-night confocal lens of claim 1, wherein: The field of view FOV of the long-focus day-and-night confocal lens satisfies Fov≥15°.

9. The long focal day-night confocal lens of claim 1, wherein: The aperture number F# of the long-focus day-and-night confocal lens satisfies F#<2.

8.

10. An image capture device, comprising: An image sensor is further included.

11. The image acquisition device according to claim 10, characterized in that: The long-focus day-and-night confocal lens has focal point consistency in the visible light waveband and the infrared waveband, and is used to generate clear images without focusing in day-and-night alternating environments; The image acquisition device is suitable for vehicle-mounted, security, and unmanned aerial vehicles.

Images