Day and night afocal athermalized lens

Abstract

The application discloses a day and night confocal athermalization lens, which comprises a shell and a refractive lens group installed in the inner cavity of the shell, and the refractive lens group corresponds to an optical axis formed in the shell, wherein the refractive lens group comprises a first double-convex spherical lens, a second meniscus spherical lens, a third double-concave spherical lens, a fourth double-concave spherical lens, a fifth double-convex spherical lens, a sixth double-convex spherical lens, a seventh double-concave spherical lens and an eighth meniscus spherical lens from the object side to the image side in sequence, and the concave surfaces of the second meniscus spherical lens and the eighth meniscus spherical lens are arranged towards the image side. The day and night confocal athermalization lens can realize infrared and high-low temperature high-quality clear imaging at a low cost, a large aperture and without focusing.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more particularly to a day / night confocal, calorimetric lens. Background Technology

[0002] With the development of optical lens technology, the market demand for high-definition, heat-free, and day-and-night lenses is increasing, and the demand in the vehicle security monitoring industry is also growing.

[0003] However, there are many drawbacks to day and night dual-use lenses currently on the market: large infrared defocus, making it impossible to achieve clear images simultaneously during the day and at night; large f-number, resulting in low light transmission and affecting image quality; and low relative illumination, leading to poor uniformity of the image surface. Summary of the Invention

[0004] The main objective of this invention is to propose a day-night confocal athermal lens, aiming to provide a low-cost, large-aperture, and high-quality, clear imaging lens for both infrared and high / low temperature conditions without the need for focusing.

[0005] To achieve the above objectives, the present invention proposes a day-night confocal athermal lens, wherein the day-night confocal athermal lens includes a housing and a refractive lens group installed in the inner cavity of the housing. The refractive lens group forms an optical axis corresponding to the housing. The refractive lens group includes, from the object side to the image side, a first biconvex spherical lens, a second meniscus spherical lens, a third biconcave spherical lens, a fourth biconcave spherical lens, a fifth biconvex spherical lens, a sixth biconvex spherical lens, a seventh biconcave spherical lens, and an eighth meniscus spherical lens. The concave surfaces of the second meniscus spherical lens and the eighth meniscus spherical lens are arranged facing the image side.

[0006] Optionally, the first biconvex spherical lens has a positive optical power; and / or,

[0007] The second meniscus lens has a positive optical power; and / or,

[0008] The third biconcave spherical lens has a negative optical power; and / or

[0009] The fourth biconcave spherical lens has a negative optical power; and / or,

[0010] The fifth biconvex spherical lens has a positive optical power; and / or

[0011] The sixth biconvex spherical lens has a positive optical power; and / or

[0012] The seventh biconcave spherical lens has a negative optical power; and / or

[0013] The eighth crescent-shaped spherical lens has a positive optical power.

[0014] Optionally, at least one of the first biconvex spherical lens, the second meniscus spherical lens, the third biconcave spherical lens, the fourth biconcave spherical lens, the fifth biconvex spherical lens, the sixth biconvex spherical lens, the seventh biconcave spherical lens, and the eighth meniscus spherical lens is made of glass.

[0015] Optionally, the first biconvex spherical lens and / or the second meniscus spherical lens are made of low-refractive-index, high-dispersion glass; and / or,

[0016] The sixth biconvex spherical lens and / or the seventh biconcave spherical lens are made of high-refractive-index, low-dispersion glass.

[0017] Optionally, the fourth biconcave spherical lens and the fifth biconvex spherical lens are cemented together; and / or,

[0018] The sixth biconvex spherical lens and the seventh biconcave spherical lens are cemented together.

[0019] Optionally, the day-night confocal athermal lens further includes an aperture stop located on the optical axis, the aperture stop being disposed between the fifth biconvex spherical lens and the sixth biconvex spherical lens.

[0020] Optionally, the total focal length of the day / night confocal, athermalized lens is f, the focal length of the first biconvex spherical lens is f1, the focal length of the second meniscus spherical lens is f2, the focal length of the third biconcave spherical lens is f3, the focal length of the fourth biconcave spherical lens is f4, the focal length of the fifth biconvex spherical lens is f5, the focal length of the sixth biconvex spherical lens is f6, the focal length of the seventh biconcave spherical lens is f7, and the focal length of the eighth meniscus spherical lens is f8; wherein...

[0021] 1 < f1 / f < 2; and / or,

[0022] 1 < f2 / f < 2; and / or,

[0023] -1 < f3 / f < -0.3; and / or,

[0024] -2 < f4 / f < -1; and / or,

[0025] 0.3 < f5 / f < 1; and / or,

[0026] 0.3 < f6 / f < 1; and / or,

[0027] -1 < f7 / f < -0.1; and / or,

[0028] 0.5 < f8 / f < 1.

[0029] Optionally, the total focal length of the day-night confocal athermalized lens is f, and the total optical length of the day-night confocal athermalized lens is TTL, where 0.5 < f / TTL < 1.5.

[0030] Optionally, the dispersion coefficient of the first biconvex spherical lens is Vd1, and Vd1 > 70; and / or,

[0031] the dispersion coefficient of the second meniscus spherical lens is Vd2, and Vd2 > 70; and / or,

[0032] the dispersion coefficient of the third biconcave spherical lens is Vd3, 35 < Vd3 < 50; and / or,

[0033] the dispersion coefficient of the fourth biconcave spherical lens is Vd4, 30 < Vd4 < 50; and / or,

[0034] the dispersion coefficient of the fifth biconvex spherical lens is Vd5, 50 < Vd5 < 60; and / or,

[0035] the dispersion coefficient of the sixth biconvex spherical lens is Vd6, 25 < Vd6 < 50; and / or,

[0036] the dispersion coefficient of the seventh biconcave spherical lens is Vd7, 20 < Vd7 < 40; and / or,

[0037] the dispersion coefficient of the eighth meniscus spherical lens is Vd8, 30 < Vd8 < 50.

[0038] Optionally, the day-night confocal athermalized lens further includes a filter, a protective glass, and a photosensitive chip in sequence from the object side to the image side, and the filter, the protective glass, and the photosensitive chip are disposed on a side of the eighth meniscus spherical lens close to the image side.

[0039] In the technical solution provided by this invention, a first biconvex spherical lens, a second meniscus spherical lens, a third biconcave spherical lens, a fourth biconcave spherical lens, a fifth biconvex spherical lens, a sixth biconvex spherical lens, a seventh biconcave spherical lens, and an eighth meniscus spherical lens are sequentially arranged along the optical axis from the object side to the image side. The concave surfaces of the second and eighth meniscus spherical lenses face towards the image side. The first biconvex spherical lens has a large aperture, allowing it to collect more light information at the same focal length, achieving clear imaging in low light. The third biconcave spherical lens is a biconcave negative lens that can cancel out the spherical projections produced by the first and second biconvex spherical lenses. The lens reduces aberrations, coma, astigmatism, and distortion, while also reducing the deflection angle of light, making the system's light smoother and reducing the sensitivity of lens mounting tolerances; the fourth, fifth, sixth, and seventh biconvex spherical lenses effectively improve field curvature, chromatic aberration, advanced aberrations, spherical aberration, and coma; the eighth meniscus spherical lens is a meniscus negative lens used to cancel the astigmatism and distortion produced by the preceding lenses and to control the principal ray angle of the lens's outgoing light to match the sensor angle to improve light energy response efficiency, thus proposing a low-cost, large-aperture, and high- and low-temperature high-quality clear imaging day and night confocal athermal lens that can achieve high-quality clear imaging without focusing. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a structure of an embodiment of the day / night confocal calorific lens provided by the present invention;

[0042] Figure 2 for Figure 1 Visible light MTF curve of a day / night confocal athermal lens;

[0043] Figure 3 for Figure 1 Infrared MTF curve of the day-night confocal athermal lens;

[0044] Figure 4 for Figure 1 MTF curve of the day-night confocal anechoic lens at a low temperature of -40℃;

[0045] Figure 5 for Figure 1 MTF curve of a day / night confocal anechoic lens at a high temperature of +80℃;

[0046] Figure 6 for Figure 1 Field curvature distortion curve of a day-night confocal athermal lens;

[0047] Figure 7 for Figure 1 The relative illumination curve of the day-night confocal athermal lens.

[0048] Explanation of icon numbers:

[0049] label name label name 100 Day and night co-focusing athermal lens 7 Seventh Biconcave Spherical Lens 1 First biconvex spherical lens 8 Eighth crescent-shaped spherical lens 2 Second meniscus spherical lens 9 aperture 3 Third biconcave spherical lens 10 Filter 4 Fourth biconcave spherical lens 11 Protective glass 5 Fifth biconvex spherical lens 12 Photosensitive chip 6 Sixth biconvex spherical lens

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0053] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0054] With the development of optical lens technology, the market demand for high-definition, heat-free, and day-and-night lenses is increasing, and the demand in the vehicle security monitoring industry is also growing. However, day-and-night lenses currently on the market have many drawbacks: large infrared defocus, making it impossible to achieve clear imaging simultaneously during the day and night; large f-number, resulting in low light transmission and affecting imaging quality; and low relative illumination, leading to poor uniformity of the imaging surface.

[0055] To address the aforementioned problems, this invention provides a day / night confocal, heat-free lens 100. Figure 1 This is a specific embodiment of the day / night confocal athermalized lens 100 provided by the present invention. Figures 2 to 7 This is a schematic diagram illustrating the technical specifications of the day / night confocal athermal lens 100 provided by the present invention.

[0056] Please see Figure 1 The day / night confocal athermal lens 100 includes a housing (not shown) and a refractive lens group installed in the inner cavity of the housing. The refractive lens group forms an optical axis within the housing. The refractive lens group includes, from the object side to the image side, a first biconvex spherical lens 1, a second meniscus spherical lens 2, a third biconcave spherical lens 3, a fourth biconcave spherical lens 4, a fifth biconvex spherical lens 5, a sixth biconvex spherical lens 6, a seventh biconcave spherical lens 7, and an eighth meniscus spherical lens 8. The concave surfaces of the second meniscus spherical lens 2 and the eighth meniscus spherical lens 8 are arranged facing the image side.

[0057] In the technical solution provided by this invention, a first biconvex spherical lens 1, a second meniscus spherical lens 2, a third biconcave spherical lens 3, a fourth biconcave spherical lens 4, a fifth biconvex spherical lens 5, a sixth biconvex spherical lens 6, a seventh biconcave spherical lens 7, and an eighth meniscus spherical lens 8 are arranged sequentially along the optical axis from the object side to the image side. The concave surfaces of the second meniscus spherical lens 2 and the eighth meniscus spherical lens 8 are positioned facing the image side. This allows the first biconvex spherical lens 1 to have a large aperture, enabling the collection of more light information under the same focal length, achieving clear imaging in low light. The third biconcave spherical lens 3 is a biconcave negative lens that can cancel out the negative effects of the first biconvex spherical lens 1 and the second meniscus spherical lens 2. The lens reduces spherical aberration, coma, astigmatism, and distortion, while also reducing the deflection angle of light, making the system's light smoother and reducing the sensitivity of lens assembly tolerances. The fourth biconcave spherical lens 4, the fifth biconvex spherical lens 5, the sixth biconvex spherical lens 6, and the seventh biconcave spherical lens 7 effectively improve field curvature, chromatic aberration, higher aberrations, spherical aberration, and coma. The eighth meniscus spherical lens 8 is a meniscus negative lens used to counteract the astigmatism and distortion produced by the preceding lenses and to control the principal ray angle of the lens's outgoing light to adapt to the angle of the photosensitive chip 12 to improve light energy response efficiency. Thus, by using spherical lenses throughout, costs are reduced while ensuring image quality and reliability, assembly sensitivity is lower, and the yield of finished products is improved. A low-cost, large-aperture, and high-quality, clear day and night confocal athermal lens 100 that can achieve infrared and high- and low-temperature imaging without focusing is proposed.

[0058] It should be noted that the basic parameters of the day and night confocal, calorific-free, low-cost lens in this embodiment are shown in Table 1, where the radius of curvature and thickness are in millimeters (mm).

[0059] Table 1

[0060]

[0061]

[0062] Specifically, in existing technologies, similar day / night confocal lenses typically have apertures of 1.4, 1.6, or even larger. This results in a small aperture and insufficient light transmission, leading to significant darkening of the image plane, especially in low light conditions, severely impacting image quality. In other embodiments, the first biconvex spherical lens 1 has a positive optical power; and / or, the second meniscus spherical lens 2 has a positive optical power; and / or, the third biconcave spherical lens 3 has a negative optical power; and / or, the fourth biconcave spherical lens 4 has a negative optical power; and / or, the fifth biconvex spherical lens 5 has a positive optical power; and / or, the sixth biconvex spherical lens 6 has a positive optical power; and / or, the seventh biconcave spherical lens 7 has a negative optical power; and / or, the eighth meniscus spherical lens 8 has a positive optical power. In the most preferred embodiment, the first biconvex spherical lens 1 has a positive optical power; the second meniscus spherical lens 2 has a positive optical power; the third biconcave spherical lens 3 has a negative optical power; the fourth biconcave spherical lens 4 has a negative optical power; the fifth biconvex spherical lens 5 has a positive optical power; the sixth biconvex spherical lens 6 has a positive optical power; the seventh biconcave spherical lens 7 has a negative optical power; and the eighth meniscus spherical lens 8 has a positive optical power. This configuration allows the day / night confocal, athermalized lens 100 to have a large aperture (F ≤ 1.2), compared to other products with F ≥ 1.4 or 1.6, resulting in greater light transmission and clear imaging even in low light conditions; the relative illumination is greater than 65%, compared to the 40% achieved by other existing products, resulting in higher image uniformity. The day and night confocal athermal lens 100 can operate in the visible light wavelength range of 486nm to 750nm and the near-infrared wavelength range of 830nm to 870nm, thus enabling it to operate both day and night.

[0063] Furthermore, in existing technologies, similar day-night confocal lenses use plastic aspherical lenses to achieve confocal focusing and control costs. This results in poor lens reliability and an inability to withstand harsh environments. To ensure better stability of the day-night confocal athermalized lens 100, in other embodiments, at least one of the following components—the first biconvex spherical lens 1, the second meniscus spherical lens 2, the third biconcave spherical lens 3, the fourth biconcave spherical lens 4, the fifth biconvex spherical lens 5, the sixth biconvex spherical lens 6, the seventh biconcave spherical lens 7, and the eighth meniscus spherical lens 8—is made of glass. Preferably, in this embodiment, all eight spherical lenses of the day-night confocal athermalized lens 100 are made of glass. Thus, by rationally allocating the lens power and considering the thermal expansion coefficient of the glass material, the lens achieves clear imaging in environments ranging from -40℃ to +80℃, ensuring high yield rates in processing and assembly, further reducing costs; it also guarantees high product reliability, meeting military standards. Figures 2 to 5The MTF curves for visible light, near-infrared, low temperature -40℃, and high temperature +80℃ are shown for this scheme. As can be seen from the graphs, the performance differences under various conditions are not significant and the consistency is good. It has excellent performance under visible light, near-infrared, low temperature -40℃, and high temperature +80℃, and can achieve clear imaging without focusing.

[0064] Furthermore, in this embodiment, the first biconvex spherical lens 1 and / or the second meniscus spherical lens 2 are made of low-refractive-index, high-dispersion glass. Using low-refractive-index, high-dispersion glass can effectively eliminate chromatic aberration and secondary spectral distortion. The sixth biconvex spherical lens 6 and / or the seventh biconcave spherical lens 7 are made of high-refractive-index, low-dispersion glass. In this embodiment, the fourth biconcave spherical lens 4 and the fifth biconvex spherical lens 5 are cemented together, as are the sixth biconvex spherical lens 6 and the seventh biconcave spherical lens 7. By rationally using cemented components, appropriately allocating optical power, and combining the thermal parameters of the glass material, aberrations are effectively corrected, and the effect of calorific distortion at high and low temperatures is achieved. Chromatic aberration is also effectively reduced, enabling simultaneous clear imaging of both visible and near-infrared wavelengths from a common focal plane, meeting the needs for day and night use.

[0065] Furthermore, to improve image quality, in this embodiment, the day / night confocal athermal lens 100 also includes an aperture stop 9 located on the optical axis, the aperture stop 9 being disposed between the fifth biconvex spherical lens 5 and the sixth biconvex spherical lens 6. This limits the on-axis beam aperture and helps improve image quality.

[0066] Specifically, in order for the various spherical lenses to work together to achieve the desired effect, in this embodiment, the total focal length of the day-night confocal athermal lens 100 is f, the focal length of the first biconvex spherical lens 1 is f1, 1 < f1 / f < 2; the focal length of the second meniscus spherical lens 2 is f2, 1 < f2 / f < 2; the focal length of the third biconcave spherical lens 3 is f3, -1 < f3 / f < -0.3; the focal length of the fourth biconcave spherical lens 4 is f4, -2 < f4 / f < -1; the focal length of the fifth biconvex spherical lens 5 is f5, 0.3 < f5 / f < 1; the focal length of the sixth biconvex spherical lens 6 is f6, 0.3 < f6 / f < 1; the focal length of the seventh biconcave spherical lens 7 is f7, -1 < f7 / f < -0.1; and the focal length of the eighth meniscus spherical lens 8 is f8, 0.5 < f8 / f < 1.

[0067] Specifically, in order to enable the day-night co-focus athermalized lens 100 to be applicable to more scenarios, in this embodiment, the total focal length of the day-night co-focus athermalized lens 100 is f, and the overall optical length of the day-night co-focus athermalized lens 100 is TTL, where 0.5 < f / TTL < 1.5. With such a setting, it meets the trend of lens miniaturization, can meet military requirements, and can also meet the daily portability needs.

[0068] Furthermore, in this embodiment, the dispersion coefficient of the first biconvex spherical lens 1 is Vd1, and Vd1 > 70; and / or, the dispersion coefficient of the second meniscus spherical lens 2 is Vd2, and Vd2 > 70; and / or, the dispersion coefficient of the third biconcave spherical lens 3 is Vd3, 35 < Vd3 < 50; and / or, the dispersion coefficient of the fourth biconcave spherical lens 4 is Vd4, 30 < Vd4 < 50; and / or, the dispersion coefficient of the fifth biconvex spherical lens 5 is Vd5, 50 < Vd5 < 60; and / or, the dispersion coefficient of the sixth biconvex spherical lens 6 is Vd6, 25 < Vd6 < 50; and / or, the dispersion coefficient of the seventh biconcave spherical lens 7 is Vd7, 20 < Vd7 < 40; and / or, the dispersion coefficient of the eighth meniscus spherical lens 8 is Vd8, 30 < Vd8 < 50. With such a setting, the dispersion of the day-night co-focus athermalized lens 100 is not obvious, and the imaging quality of the lens is good.

[0069] Furthermore, in this embodiment, the day-night co-focus athermalized lens 100 further includes a filter 10, a protective glass 11, and a photosensitive chip 12 in sequence from the object side to the image side. The filter 10, the protective glass 11, and the photosensitive chip 12 are disposed on one side of the eighth meniscus spherical lens 8 close to the image side. With such a setting, the filter 10 can effectively filter out stray light in non-working bands to reduce optical noise and reduce difficulties for the subsequent optoelectronic module processing part.

[0070] To sum up, the technical indicators achieved by this optical system of the day-night co-focus athermalized lens 100 are as follows: the effective focal length of the day-night co-focus athermalized lens 100 is EFFL, where EFFL = 31 mm; the field angle of the day-night co-focus athermalized lens 100 is 2w, where 2w ≥ 16°; the imaging circle diameter of the day-night co-focus athermalized lens 100 is φ, where φ > 9.2 mm; the working spectral range of the day-night co-focus athermalized lens 100 is: 486 - 750 nm, 830 - 870 nm; the overall optical length of the day-night co-focus athermalized lens 100 is TTL, where TTL ≤ 50 mm; the optical back focal length of the day-night co-focus athermalized lens 100 is BFL, where BFL ≥ 9 mm; the F-Tan distortion of the day-night co-focus athermalized lens 100 is less than or equal to 1.5%; the relative illumination of the day-night co-focus athermalized lens 100 is ≥ 65%.

[0071] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A day and night confocal athermal lens, characterized in that, The first double convex spherical lens, the second meniscus spherical lens, the third double concave spherical lens, the fourth double concave spherical lens, the fifth double convex spherical lens, the sixth double convex spherical lens, the seventh double concave spherical lens and the eighth meniscus spherical lens at least one of the material is glass. The first double convex spherical lens and / or the second meniscus spherical lens material is low refractive high dispersion glass; and / or, 2. The day-night confocal athermalization lens of claim 1, wherein, The sixth double convex spherical lens and / or the seventh double concave spherical lens material is high refractive low dispersion glass. The fourth double concave spherical lens and the fifth double convex spherical lens are glued together; and / or, The sixth double convex spherical lens and the seventh double concave spherical lens are glued together. The day and night confocal athermalization lens further comprises a diaphragm on the optical axis, the diaphragm is arranged between the fifth double convex spherical lens and the sixth double convex spherical lens. The total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein 0.5 The first double convex spherical lens, the second meniscus spherical lens, the third double concave spherical lens, the fourth double concave spherical lens, the fifth double convex spherical lens, the sixth double convex spherical lens, the seventh double concave spherical lens and the eighth meniscus spherical lens at least one of the material is glass. The first double convex spherical lens and / or the second meniscus spherical lens material is low refractive high dispersion glass; and / or, The sixth double convex spherical lens and / or the seventh double concave spherical lens material is high refractive low dispersion glass.

3. The day-night confocal athermalization lens of claim 1, wherein, The fourth double concave spherical lens and the fifth double convex spherical lens are glued together; and / or, 4. The day-night confocal athermalization lens of claim 3, wherein, The sixth double convex spherical lens and the seventh double concave spherical lens are glued together. The day and night confocal athermalization lens further comprises a diaphragm on the optical axis, the diaphragm is arranged between the fifth double convex spherical lens and the sixth double convex spherical lens.

5. The day-night confocal athermalization lens of claim 1, wherein, The total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein 0.5 The first double convex spherical lens, the second meniscus spherical lens, the third double concave spherical lens, the fourth double concave spherical lens, the fifth double convex spherical lens, the sixth double convex spherical lens, the seventh double concave spherical lens and the eighth meniscus spherical lens at least one of the material is glass.

6. The day-night confocal athermalization lens of claim 1, wherein, The first double convex spherical lens and / or the second meniscus spherical lens material is low refractive high dispersion glass; and / or, 7. The day-night confocal athermalization lens of claim 1, wherein, The sixth double convex spherical lens and / or the seventh double concave spherical lens material is high refractive low dispersion glass.

8. The day-night confocal athermalization lens of claim 1, wherein, The fourth double concave spherical lens and the fifth double convex spherical lens are glued together; and / or, The sixth double convex spherical lens and the seventh double concave spherical lens are glued together. The day and night confocal athermalization lens further comprises a diaphragm on the optical axis, the diaphragm is arranged between the fifth double convex spherical lens and the sixth double convex spherical lens. The total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein 0.5 The first double convex spherical lens, the second meniscus spherical lens, the third double concave spherical lens, the fourth double concave spherical lens, the fifth double convex spherical lens, the sixth double convex spherical lens, the seventh double concave spherical lens and the eighth meniscus spherical lens at least one of the material is glass. The first double convex spherical lens and / or the second meniscus spherical lens material is low refractive high dispersion glass; and / or, The sixth double convex spherical lens and / or the seventh double concave spherical lens material is high refractive low dispersion glass. The fourth double concave spherical lens and the fifth double convex spherical lens are glued together; and / or, The sixth double convex spherical lens and the seventh double concave spherical lens are glued together. The day and night confocal athermalization lens further comprises a diaphragm on the optical axis, the diaphragm is arranged between the fifth double convex spherical lens and the sixth double convex spherical lens. The total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein 0.5 The first double convex spherical lens, the second meniscus spherical lens, the third double concave spherical lens, the fourth double concave spherical lens, the fifth double convex spherical lens, the sixth double convex spherical lens, the seventh double concave spherical lens and the eighth meniscus spherical lens at least one of the material is glass. The first double convex spherical lens and / or the second meniscus spherical lens material is low refractive high dispersion glass; and / or, The sixth double convex spherical lens and / or the seventh double concave spherical lens material is high refractive low dispersion glass. The fourth double concave spherical lens and the fifth double convex spherical lens are glued together; and / or, The sixth double convex spherical lens and the seventh double concave spherical lens are glued together. The day and night confocal athermalization lens further comprises a diaphragm on the optical axis, the diaphragm is arranged between the fifth double convex spherical lens and the sixth double convex spherical lens. The total focal length of the day and night confocal athermalization lens is f, and the optical total length of the day and night confocal athermalization lens is TTL, wherein 0.5 a dispersion coefficient of the third biconcave spherical lens is Vd3, and 35 < Vd3 < 50; and / or, a dispersion coefficient of the fourth biconcave spherical lens is Vd4, and 30 < Vd4 < 50; and / or, a dispersion coefficient of the fifth biconvex spherical lens is Vd5, and 50 < Vd5 < 60; and / or, a dispersion coefficient of the sixth biconvex spherical lens is Vd6, and 25 < Vd6 < 50; and / or, a dispersion coefficient of the seventh biconcave spherical lens is Vd7, and 20 < Vd7 < 40; and / or, a dispersion coefficient of the eighth meniscus spherical lens is Vd8, and 30 < Vd8 < 50.

9. The day-night confocal athermalization lens of claim 1, wherein, The day and night confocal athermalization lens further comprises, in sequence from the object side to the image side, a filter, a protective glass and a photosensitive chip, wherein the filter, the protective glass and the photosensitive chip are arranged on a side of the eighth meniscus spherical lens close to the image side.

Images