A high-resolution low-light system and electronic device

Abstract

This invention discloses a high-resolution low-light system and electronic device. The high-resolution low-light system comprises, from the object side to the image side, a first lens unit and a second lens unit. The first lens unit, from the object side to the image side, includes, in sequence, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The second lens unit, from the object side to the image side, includes, in sequence, a sixth lens, a seventh lens, and an eighth lens. The first lens has positive refractive power, and its object side is convex near the optical axis, while its image side is neither concave nor convex near the optical axis. The second and third lenses are combined to form a first cemented lens. The fourth lens has positive refractive power, and its object side is concave near the optical axis, while its image side is convex near the optical axis. This solution provides a high-resolution, high-pixel lens, compatible with an 8MP sensor, and offers uniform image quality in both the center and edge fields of view, solving the problem of low resolution in previous low-light night vision lenses.

Description

Technical Field

[0001] This invention relates to the field of low-light lens technology, and more particularly to a high-resolution low-light system. Background Technology

[0002] With the rapid development of low-light night vision technology, high-resolution and high-sensitivity low-light night vision devices are constantly emerging, requiring clear and stable images under extremely low light conditions. The requirements for lenses are also increasing. Currently, low-light lenses on the market, while pursuing large light throughput, suffer from low resolution and large aberrations; they are also large, complex in structure, and poorly portable; in darker environments, they have low image resolution, poor transmittance, are susceptible to strong light interference, and are expensive. Therefore, continuous innovation is needed to improve their performance and functionality. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a high-resolution low-light system and electronic device with high optical performance. This lens can at least solve one of the technical shortcomings mentioned in the background art.

[0004] According to one aspect of the present invention, a high-resolution low-light system is provided, comprising a first lens unit and a second lens unit in sequence from the object side to the image side;

[0005] The first lens unit includes, in sequence from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens;

[0006] The second lens unit includes, in sequence from the object side to the image side: a sixth lens, a seventh lens, and an eighth lens; wherein, the first lens has positive refractive power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is not limited to concave or convex near the optical axis.

[0007] The second and third lenses are combined to form the first cemented lens;

[0008] The fourth lens has positive refractive power. The object side of the fourth lens is concave near the optical axis, and the image side of the fourth lens is convex near the optical axis.

[0009] The fifth lens has negative refractive power. The object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis.

[0010] The sixth lens has negative refractive power. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis.

[0011] The seventh lens has positive refractive power;

[0012] The eighth lens has positive refractive power, and the object side of the eighth lens is concave near the optical axis.

[0013] In the above technical solution, the lens features high resolution and high pixel count, compatible with an 8M pixel sensor, and provides uniform image quality in both the center and edge fields of view, solving the problem of low resolution in previous low-light night vision lenses. Low-light technology will continue to develop towards high performance, intelligence, and miniaturization. The lens structure is simple, meeting miniaturization requirements and making it more portable. The lens operates across a wavelength range from visible light to infrared light, achieving high resolution and low aberrations at both wavelengths. It can output high-definition images in various environments. The lens has high light transmittance, excellent low-light performance, and high transmittance, and also features fog penetration capabilities.

[0014] In some embodiments, the system satisfies the following condition:

[0015] 2.2 <TTL / TT1<3.2

[0016] In the formula, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the system, and TT1 is the distance on the optical axis from the object side of the first lens to the aperture.

[0017] The above technical solutions facilitate lens miniaturization and reduce overall length.

[0018] In some embodiments, the system satisfies the following condition:

[0019] 0.5 < |FL1 / TTL| < 1.5

[0020] In the formula, FL1 is the focal length of the first lens unit.

[0021] In the above technical solution, the optical power is reasonably allocated to improve the resolution of the lens.

[0022] In some embodiments, the system satisfies the following condition:

[0023] 0.8 <Rx3 / Rw4<1.8

[0024] In the formula, Rx3 is the radius of curvature of the image side of the third lens at the optical axis, and Rw4 is the radius of curvature of the object side of the fourth lens at the optical axis.

[0025] The above technical solution facilitates smooth light transition, reduces the front port diameter, and achieves miniaturization.

[0026] In some embodiments, the system satisfies the following condition:

[0027] 4.5 <SD8 / |SAG8|<7

[0028] In the formula, SD8 is the maximum aperture diameter of the object side of the eighth lens, and SAG8 is the sag at the maximum effective half-aperture of the object side of the eighth lens.

[0029] The above technical solutions are beneficial for correcting aberrations such as field curvature and improving resolution.

[0030] In some embodiments, the fourth lens and the fifth lens are combined to form a second cemented lens.

[0031] The above technical solutions are conducive to miniaturization, reducing tolerances, and improving resolution.

[0032] In some embodiments, the system satisfies the following condition:

[0033] 0.4 < |(F2*F3) / (F4*F5)| < 1.8

[0034] In the formula, F2, F3, F4, and F5 are the focal lengths of the second, third, fourth, and fifth lenses, respectively.

[0035] In the above technical solution, light is collected from the first cemented lens, converged, and then transferred to the second cemented lens, thereby achieving a large target surface and improved resolution.

[0036] In some embodiments, the system satisfies the following condition:

[0037] 0.01 < (F6 / F7) / F8 < 0.08

[0038] In the formula, F6, F7, and F8 are the focal lengths of the sixth, seventh, and eighth lenses, respectively.

[0039] In the above technical solution, the purpose of the above settings is to balance temperature drift and achieve heatless operation.

[0040] According to another aspect of the present invention, an electronic device is provided, comprising the aforementioned high-resolution low-light system; and

[0041] An image sensor is configured to receive images formed by the high-resolution low-light system.

[0042] In the above technical solution, the advantage of this electronic device relies on a high-resolution low-light system, which will not be elaborated here. Attached Figure Description

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 , Figure 6 , Figure 11 , Figure 16 These are schematic diagrams of examples 1 to 4 of a high-resolution low-light system according to the present invention.

[0045] Figure 2 , Figure 7 , Figure 12 , Figure 17 These are the optical fan diagrams of the high-resolution low-light system examples 1 to 4 of the present invention, covering the 436nm, 510nm, 555nm, and 650nm wavelength ranges.

[0046] Figure 3 , Figure 8 , Figure 13 , Figure 18 These are the optical fan diagrams of the high-resolution low-light system examples 1 to 4 of the present invention in the 850nm, 900nm, and 940nm band ranges, respectively.

[0047] Figure 4 , Figure 9 , Figure 14 , Figure 19 These are MTF curves of the high-resolution low-light system examples 1 to 4 of the present invention in the 436-650nm band range;

[0048] Figure 5 , Figure 10 , Figure 15 , Figure 20 These are MTF curves of the 850-940nm band range for Examples 1 to 4 of the high-resolution low-light system of the present invention.

[0049] Figure 21 This is a schematic diagram of the structure of an electronic device example 5 of the present invention. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] The purpose of this invention is to provide a high-resolution low-light system and electronic device with high optical performance. Embodiments according to the invention will now be described in detail with reference to the accompanying drawings.

[0052] Figure 1 , Figure 6 , Figure 11 , Figure 16 These are cross-sectional views of high-resolution low-light systems (optical systems) according to Examples 1 to 4. The high-resolution low-light systems according to each example are used in imaging devices including digital cameras, digital still cameras, broadcast cameras, surveillance cameras, etc., and in optical devices with interchangeable lenses. In each cross-sectional view, the left side is the object-side OBJ and the right side is the image-side IMA. In each cross-sectional view, Gij represents the j-th lens of the i-th lens unit, and Ci represents the i-th cemented lens. ST represents the aperture stop (fixed aperture stop or visible aperture stop), and IMA represents the image plane. When the high-resolution low-light systems 1 to 4 according to each example are used in imaging optical systems for digital cameras or digital still cameras, solid-state imaging elements (photoelectric conversion elements), such as CMOS image sensors or CCD image sensors, are arranged on the image plane IMA.

[0053] The high-resolution low-light system according to various examples includes, in order from the object side to the image side: a first lens unit G1 and a second lens unit G2, sequentially from the object side to the image side; the first lens unit G1 includes, sequentially from the object side to the image side: a first lens G11, a second lens G12, a third lens G13, a fourth lens G14, and a fifth lens G15; the second lens unit G2 includes, sequentially from the object side to the image side: a sixth lens G21, a seventh lens G22, and an eighth lens G23; and a protective lens G3; in this specific embodiment, all the above lenses are made of glass; and all the lens surfaces are spherical; wherein...

[0054] The first lens G11 has positive refractive power. The object-side surface of the first lens is convex near the optical axis, and the image-side surface of the first lens is neither concave nor convex near the optical axis. The second lens G12 and the third lens G13 are combined to form a first cemented lens C1. The fourth lens G14 has positive refractive power. The object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis. The fifth lens G15 has negative refractive power. The object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis. The sixth lens G21 has negative refractive power. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis. The seventh lens G22 has positive refractive power. The eighth lens G23 has positive refractive power, and the object-side surface of the eighth lens is concave near the optical axis. The fourth lens and the fifth lens are combined to form a second cemented lens C2. The sixth lens and the seventh lens are combined to form the second cemented lens C3.

[0055] The high-resolution low-light systems in each example can satisfy at least one of the following setup conditions 1) to 6):

[0056] 1)2.2 <TTL / TT1<3.2

[0057] 2) 0.5 < |FL1 / TTL| < 1.5

[0058] 3)0.8 <Rx3 / Rw4<1.8

[0059] 4)4.5 <SD8 / |SAG8|<7

[0060] 5) 0.4 < |(F2*F3) / (F4*F5)| < 1.8

[0061] 6) 0.01 < (F6 / F7) / F8 < 0.08

[0062] In the above conditional expressions, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the system; TT1 is the distance on the optical axis from the object side of the first lens to the aperture; FL1 is the focal length of the first lens unit; Rx3 is the radius of curvature on the optical axis of the image side of the third lens; Rw4 is the radius of curvature on the optical axis of the object side of the fourth lens; SD8 is the maximum aperture diameter of the object side of the eighth lens; SAG8 is the sag at the maximum effective half-aperture of the object side of the eighth lens; F2, F3, F4, and F5 are the focal lengths of the second, third, fourth, and fifth lenses, respectively; Vd2 is the Abbe coefficient of the second lens; Vd3 is the Abbe coefficient of the third lens; and F6, F7, and F8 are the focal lengths of the sixth, seventh, and eighth lenses, respectively.

[0063] Conditional expression 1) defines the distance from the object side surface of the first lens to the imaging surface of the system on the optical axis and the distance from the object side surface of the first lens to the aperture stop on the optical axis. By appropriately setting the conditions, 2.2 < TTL / TT1 < 3.2 is satisfied. If it is higher than the upper limit value, the overall length becomes too long. But if it is lower than the lower limit value, the outer diameter becomes too large. In addition, in order to reliably obtain the effect of this conditional expression 1), it is more preferable to set the value of conditional expression 1) to 2.2 < TTL / TT1 < 2.8.

[0064] Conditional expression 2) defines the ratio of the focal length of the first lens unit to the distance from the object side surface of the first lens to the imaging surface of the system on the optical axis. By appropriately setting the conditions, 0.5 < |FL1 / TTL| < 1.5 is satisfied. If it is higher than the upper limit value, the focal length of the first lens unit is too large, damaging the lens sensitivity. But if it is lower than the lower limit value, the resolution is too low. In addition, in order to reliably obtain the effect of this conditional expression 2), it is more preferably to set the value of conditional expression 2) to 0.8 < |FL1 / TTL| < 1.2.

[0065] Conditional expression 3) defines the ratio of the radius of curvature of the image side surface of the third lens on the optical axis to the radius of curvature of the object side surface of the fourth lens on the optical axis. By appropriately setting the conditions, 0.8 < Rx3 / Rw4 < 1.8 is satisfied. In addition, in order to reliably obtain the effect of this conditional expression 3), it is more preferably to set the value of conditional expression 3) to 0.8 < Rx3 / Rw4 < 1.4.

[0066] Conditional expression 4) defines the ratio of the maximum clear aperture diameter of the object side surface of the eighth lens to the absolute value of the sagitta height at the maximum optical effective semi-aperture of the object side surface of the eighth lens. By appropriately setting the conditions, it is beneficial to correct aberrations such as field curvature and improve the resolution. If it is higher than the upper limit value, the resolution decreases and the field curvature becomes too large. But if it is lower than the lower limit value, the aberration becomes large and the resolution decreases.

[0067] Conditional expression 5) defines the product ratio of the second lens, the third lens, the fourth lens, and the fifth lens. By appropriately setting the conditions, the light is collected from the first cemented lens and converges and transitions to the second cemented lens, achieving a large target surface and improving the resolution. If it exceeds this specified range, it will affect the resolution and miniaturization, and the lens performance will decline.

[0068] Conditional expression 6) defines the relationship between the focal lengths of the sixth lens, the seventh lens, and the eighth lens. By appropriately setting the conditions, the temperature drift is balanced and athermalization is achieved. If it is higher than the upper limit value, the temperature drift is too large, affecting the image quality. But if it is lower than the lower limit value, the temperature drift is too small, affecting the image quality.

[0069] Now, a detailed description of the high-resolution low-light system according to each example will be given. It should be noted that except for the different conditional expressions and specific parameter tables provided in this case, the others are the same.

[0070] Please refer to the optical structure of Example 1. Figure 1 The specific parameters for Example 1 are shown in Table 1 below. In Example 1, the conditional expression is as follows (rounded to three decimal places):

[0071] 1)TTL / TT1=2.466: TTL=79.390, TT1=32.200.

[0072] 2) |FL1 / TTL|=0.945: FL1=75.000.

[0073] 3) Rx3 / Rw4=1.124: Rx3=-59.400, Rw4=-52.826.

[0074] 4) SD8 / |SAG8|=5.154: SD8=6.500, SAG8=1.000.

[0075] 5)|(F2*F3) / (F4*F5)|=0.714.

[0076] 6)(F6 / F7) / F8=0.051.

[0077] Table 1 Example 1 Parameter Table

[0078] Face number Surface name Surface type radius of curvature thickness Material Refractive index Abbe number focal length 1 First lens spherical 46.700 7.00 Glass 1.61 60.6 99.2 2 spherical 190.000 0.20 3 Second lens spherical 48.302 1.50 Glass 1.49 70.4 -70.2 4 The third lens spherical 19.800 14.40 Glass 1.50 81.6 31.8 5 spherical -59.400 0.60 6 Fourth lens spherical -52.826 4.40 Glass 1.99 16.5 88.3 7 Fifth lens spherical -34.418 1.20 Glass 1.75 25.0 -35.4 8 spherical 123.650 2.90 9 aperture Infinity 30.30 10 Sixth lens spherical 39.380 1.00 Glass 1.74 27.8 -67.2 11 Seventh Lens spherical 21.810 3.20 Glass 1.88 40.1 30.7 12 spherical 102.768 2.80 13 Eighth lens spherical -24.847 0.99 Glass 1.59 61.3 -43.2 14 spherical -918.840 1.00 15 Protective glass spherical Infinity 0.50 Glass 1.52 64.2 16 spherical Infinity 7.40 17 Image plane Infinity

[0079] Please refer to the optical structure of Example 2. Figure 6 The specific parameters for Example 2 are shown in Table 2 below. In Example 2, the conditional expression is as follows (rounded to three decimal places):

[0080] 1)TTL / TT1=2.325: TTL=79.800, TT1=34.320.

[0081] 2) |FL1 / TTL|=0.946: FL1=75.500.

[0082] 3) Rx3 / Rw4=1.076: Rx3=-60.957, Rw4=-56.643.

[0083] 4) SD8 / |SAG8|=5.392: SD8=6.470, SAG8=1.200.

[0084] 5)|(F2*F3) / (F4*F5)|=0.650.

[0085] 6)(F6 / F7) / F8=0.026.

[0086] Table 2 Example 2 Parameter Table

[0087] Face number Surface name Surface type radius of curvature thickness Material Refractive index Abbe number focal length 1 First lens spherical 44.470 7.00 Glass 1.60 60.6 88.9 2 spherical 241.000 0.17 3 Second lens spherical 48.592 1.50 Glass 1.49 70.4 -68 4 The third lens spherical 19.544 14.20 Glass 1.50 81.6 31.5 5 spherical -60.957 0.45 6 Fourth lens spherical -56.643 6.72 Glass 1.99 16.5 95.3 7 Fifth lens spherical -37.588 1.12 Glass 1.76 27.5 -34.6 8 spherical 89.390 3.16 9 aperture Infinity 29.48 10 Sixth lens spherical 30.100 1.00 Glass 1.73 28.3 -37 11 Seventh Lens spherical 14.000 3.38 Glass 1.88 39.2 23.8 12 spherical 37.399 1.73 13 Eighth lens spherical -22.404 0.99 Glass 1.55 75.5 -59.1 14 spherical -72.746 1.00 15 Protective glass spherical Infinity 0.50 Glass 1.52 64.2 16 spherical Infinity 7.40 17 Image plane Infinity

[0088] Please refer to the optical structure of Example 3. Figure 11 The specific parameters for Example 3 are shown in Table 3 below. In Example 3, the conditional expression is as follows (rounded to three decimal places):

[0089] 1)TTL / TT1=2.218: TTL=89.640, TT1=40.420.

[0090] 2) |FL1 / TTL|=1.052: FL1=94.300.

[0091] 3) Rx3 / Rw4=1.060: Rx3=-51.000, Rw4=-48.117.

[0092] 4) SD8 / |SAG8|=5.154: SD8=6.700, SAG8=1.300.

[0093] 5)|(F2*F3) / (F4*F5)|=0.488.

[0094] 6)(F6 / F7) / F8=0.059.

[0095] Table 3 Example 3 Parameter Table

[0096] Face number Surface name Surface type radius of curvature thickness Material Refractive index Abbe number focal length 1 First lens spherical 50.500 10.00 Glass 1.73 54.7 87.70 2 spherical 218.280 0.10 3 Second lens spherical 57.739 1.00 Glass 1.49 70.4 -55.30 4 The third lens spherical 18.299 14.30 Glass 1.50 81.6 29.10 5 spherical -51.000 0.33 6 Fourth lens spherical -48.117 2.59 Glass 1.95 18.0 110.00 7 Fifth lens spherical -34.370 8.90 Glass 1.72 29.5 -30.00 8 spherical 65.511 3.20 9 aperture Infinity 22.60 10 Sixth lens spherical 47.833 1.00 Glass 1.74 27.8 -63.90 11 Seventh Lens spherical 23.669 8.00 Glass 1.88 39.2 25.10 12 spherical -312.703 2.00 13 Eighth lens spherical -32.384 1.22 Glass 1.57 42.8 -43.10 14 spherical 106.653 4.50 15 Protective glass spherical Infinity 1.00 Glass 1.52 64.2 16 spherical Infinity 0.50 17 Image plane Infinity 8.40

[0097] Please refer to the optical structure of Example 4. Figure 16 The specific parameters for Example 4 are shown in Table 4 below. In Example 4, the conditional expression is as follows (rounded to three decimal places):

[0098] 1)TTL / TT1=2.423: TTL=89.780, TT1=37.060.

[0099] 2) |FL1 / TTL|=0.978: FL1=87.800.

[0100] 3) Rx3 / Rw4=1.477: Rx3=-203.150, Rw4=-137.550.

[0101] 4) SD8 / |SAG8|=5.833: ​​SD8=7.000, SAG8=1.200.

[0102] 5)|(F2*F3) / (F4*F5)|=1.700.

[0103] 6)(F6 / F7) / F8=0.052.

[0104] Table 4 Example 4 Parameter Table

[0105] Face number Surface name Surface type radius of curvature thickness Material Refractive index Abbe number focal length 1 First lens spherical 90.000 10.00 Glass 1.57 57.5 126.90 2 spherical -357.000 0.10 3 Second lens spherical 34.831 11.00 Glass 1.46 90.2 43.00 4 The third lens spherical -45.131 2.00 Glass 1.46 90.3 -117.4 5 spherical -203.150 0.42 6 Fourth lens spherical -137.550 8.92 Glass 1.95 18.0 80.70 7 Fifth lens spherical -50.985 1.00 Glass 1.76 25.5 -36.80 8 spherical 63.416 3.62 9 aperture Infinity 33.08 10 Sixth lens spherical 35.149 1.00 Glass 1.73 22.9 -48.10 11 Seventh Lens spherical 17.431 4.94 Glass 1.88 39.2 22.00 12 spherical 142.244 2.80 13 Eighth lens spherical -36.522 1.00 Glass 1.49 70.4 -42.25 14 spherical 47.968 2.00 15 Protective glass spherical Infinity 0.50 Glass 1.52 64.2 16 spherical Infinity 7.40 17 Image plane Infinity

[0106] Based on Examples 1 to 4, this case has the following advantages:

[0107] 1. This solution features a high-resolution, high-pixel lens that can be matched with an 8M pixel sensor, providing uniform image quality in both the center and edge fields of view, thus solving the problem of low resolution in previous low-light night vision lenses;

[0108] 2. Low-light technology will continue to develop towards higher performance, greater intelligence, and miniaturization. This solution features a simple lens structure, meets miniaturization requirements, and is more portable.

[0109] 3. The lens in this solution operates across a wavelength range from visible light to infrared light, achieving high resolution and low aberrations at both wavelengths; it can output high-definition images in various environments.

[0110] 4. This solution features a lens with high light throughput, excellent low-light performance, high transmittance, and fog-penetrating capability;

[0111] Example 5

[0112] For reference Figure 21 A description of an electronic device A according to Example 5 of the present invention will be given. Figure 21 This is a schematic diagram of an electronic device (camera) for a photographic optical system in any of the high-resolution low-light systems according to Examples 1 to 4.

[0113] exist Figure 21 In the figures, reference numeral A2 indicates the main body of the electronic device, and reference numeral A1 indicates any of the imaging optical systems (interchangeable lenses) included in the high-resolution low-light systems according to Examples 1 to 4. Reference numeral A3 indicates an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (the optical image formed by the imaging optical system 11) from the imaging optical system A1 and performs photoelectric conversion.

[0114] By using the high-resolution low-light system according to any one of Examples 1 to 4 in electronic devices such as digital still cameras, electronic devices with high-resolution low-light systems with high optical performance can be obtained.

[0115] Each example can provide electronic devices with high optical performance.

[0116] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. A high-resolution low-light system, characterized in that, From the object side to the image side, the lenses are arranged in the following order: first lens unit, second lens unit; the first lens unit, from the object side to the image side, consists of: first lens, second lens, third lens, fourth lens, fifth lens; the second lens unit, from the object side to the image side, consists of: sixth lens, seventh lens, eighth lens; wherein, The first lens has positive refractive power. The object side of the first lens is convex near the optical axis, and the image side of the first lens is neither concave nor convex near the optical axis. The second and third lenses are combined to form the first cemented lens; The fourth lens has positive refractive power. The object side of the fourth lens is concave near the optical axis, and the image side of the fourth lens is convex near the optical axis. The fifth lens has negative refractive power. The object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis. The sixth lens has negative refractive power. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis. The seventh lens has positive refractive power; The eighth lens has negative refractive power, and the object side of the eighth lens is concave near the optical axis. The system satisfies the following condition: 0.4 < |(F2*F3) / (F4*F5)| < 1.8 In the formula, F2, F3, F4, and F5 are the focal lengths of the second, third, fourth, and fifth lenses, respectively. The system satisfies the following condition: 0.01 < (F6 / F7) / F8 < 0.08 In the formula, F6, F7, and F8 are the focal lengths of the sixth, seventh, and eighth lenses, respectively.

2. The high-resolution low-light system as described in claim 1, characterized in that, The system satisfies the following condition: 2.2 <TTL / TT1<3.2 In the formula, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the system, and TT1 is the distance on the optical axis from the object side of the first lens to the aperture.

3. The high-resolution low-light system as described in claim 1, characterized in that, The system satisfies the following condition: 0.5 < |FL1 / TTL| < 1.5 In the formula, FL1 is the focal length of the first lens unit.

4. A high-resolution low-light system as described in claim 1, characterized in that, The system satisfies the following condition: 0.8 <Rx3 / Rw4<1.8 In the formula, Rx3 is the radius of curvature of the image side of the third lens at the optical axis, and Rw4 is the radius of curvature of the object side of the fourth lens at the optical axis.

5. A high-resolution low-light system as described in claim 1, characterized in that, The system satisfies the following condition: 4.5 <SD8 / |SAG8|<7 In the formula, SD8 is the maximum aperture diameter of the object side of the eighth lens, and SAG8 is the sag at the maximum effective half-aperture of the object side of the eighth lens.

6. A high-resolution low-light system as described in claim 1, characterized in that, The fourth lens and the fifth lens are combined to form a second cemented lens.

7. An electronic device, characterized in that, A high-resolution low-light system according to any one of claims 1-6; and An image sensor is configured to receive images formed by the high-resolution low-light system.

Images