Vehicle-mounted infrared large-aperture lens

Abstract

The application provides a vehicle-mounted infrared large-aperture lens, and an optical system of the lens comprises 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 along an optical axis in sequence, and a diaphragm is arranged between the third lens and the fourth lens; the first lens, the fourth lens and the eighth lens are negative lenses, and the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are positive lenses; the seventh lens and the eighth lens are combined to form a cemented lens. The number of lenses and the refractive power combination in the infrared optical lens are reasonably arranged, so that the lens has a larger aperture, and the imaging effect of the vehicle-mounted infrared lens under low illumination is greatly improved; meanwhile, the refractive index of each lens and the spacing between adjacent lenses are reasonably configured, so that the infrared optical lens has the advantages of a large image surface, high pixels, compact structure, high cost performance and the like.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a vehicle-mounted infrared large-aperture lens. Background Technology

[0002] In recent years, automotive cameras have seen a wide range of applications and demand. When installed around a car, they can provide all-around imaging without blind spots, offering driving assistance and safety to the driver, as well as assisting in the detection and monitoring of autonomous vehicles.

[0003] With the improvement of living standards and the development of imaging technology, existing vehicle-mounted cameras also need to possess a certain level of night vision capability. Vehicle-mounted infrared cameras use photoelectric technology to detect specific bands of infrared signals emitted by an object's thermal radiation, converting these signals into images and graphics that can be distinguished by human vision. Vehicle-mounted infrared cameras utilize infrared thermal imaging technology to make darkness appear like daytime, allowing drivers to see further and more clearly at night, while remaining unaffected by smog or sandstorms, enabling all-weather, 24 / 7 operation.

[0004] Existing automotive infrared lenses generally have apertures of only F1.4 or smaller (the larger the F number, the smaller the lens aperture), which cannot achieve high-quality imaging in extremely dark conditions with low illumination (such as at night or in extreme weather). Summary of the Invention

[0005] This invention proposes a vehicle-mounted infrared large-aperture lens, which solves the problems of the generally small aperture of ordinary vehicle-mounted infrared lenses in the prior art, resulting in low light transmission and poor image quality in low-light environments.

[0006] The technical solution of this invention is implemented as follows:

[0007] A vehicle-mounted infrared large-aperture lens, the optical system of which 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, with an aperture stop between the third lens and the fourth lens; the first lens, the fourth lens, and the eighth lens are negative lenses, and the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are positive lenses; the seventh lens and the eighth lens are combined to form a cemented lens.

[0008] As a preferred embodiment of the present invention, the first lens, the fourth lens, and the eighth lens are all biconcave lenses, and the third lens, the sixth lens, and the seventh lens are all biconvex lenses; the image-side surface of the second lens and the fifth lens is convex, and the object-side surface is concave or convex; the above surface design facilitates the realization of the above optical power matching method, thereby improving the imaging quality.

[0009] As a preferred embodiment of the present invention, the focal lengths of different lenses in the optical system satisfy the following conditions:

[0010] -10.02mm≤f1≤-13.23mm;

[0011] 50.10mm≤f2≤55.55mm;

[0012] 11.35mm≤f3≤14.95mm;

[0013] -8.20mm≤f4≤-6.75mm;

[0014] 15.1mm≤f5≤19.05mm;

[0015] 13.5mm≤f6≤17.6mm;

[0016] 7.20mm≤f7≤10.75mm;

[0017] -10.51mm≤f8≤-7.05mm;

[0018] Wherein, f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens, respectively; by constraining the focal lengths of each lens within the above range, it is easier to improve the imaging quality of the lens in low-light environments, which helps to correct tolerances and ensure the assembly quality of the process.

[0019] In a preferred embodiment of the present invention, the refractive indices of different lenses in the optical system satisfy the following condition:

[0020] 1.71≤Nd1≤1.85;

[0021] 1.80≤Nd2≤1.87;

[0022] 1.88≤Nd3≤1.95;

[0023] 1.89≤Nd4≤1.95;

[0024] 1.72≤Nd5≤1.85;

[0025] 1.68≤Nd6≤1.80;

[0026] 1.62≤Nd5≤1.805;

[0027] 1.62≤Nd5≤1.805;

[0028] Among them, Nd1, Nd2, Nd3, Nd4, Nd5, Nd6, Nd7, and Nd8 are the refractive indices of the optical materials of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens, respectively.

[0029] In a preferred embodiment of the present invention, the spacing between adjacent lenses in the optical system satisfies the following condition:

[0030] 2.31mm≤CV1≤2.86mm;

[0031] 0.02mm≤CV2≤0.25mm;

[0032] 0.15mm≤CV3≤0.73mm;

[0033] 4.69mm≤CV4≤6.31mm;

[0034] 0.52mm≤CV5≤1.20mm;

[0035] 0.02mm≤CV6≤0.15mm;

[0036] 0.00mm≤CV7≤0.17mm;

[0037] 4.55mm≤CV8≤6.75mm;

[0038] Wherein, CV1 is the distance between the first lens and the second lens, CV2 is the distance between the second lens and the third lens, CV3 is the distance between the third lens and the aperture stop, CV4 is the distance between the aperture stop and the fourth lens, CV5 is the distance between the fourth lens and the fifth lens, CV6 is the distance between the fifth lens and the sixth lens, CV7 is the distance between the sixth lens and the seventh lens, and CV8 is the distance between the third lens and the fourth lens.

[0039] As a preferred embodiment of the present invention, the effective focal length of the optical system is 7.5mm≤EFL≤10.1mm; the optical back focal length of the optical system is 4.50mm≤BFL≤6.00mm.

[0040] As a preferred embodiment of the present invention, the aperture of the optical system is: 0.90≤F / NO≤1.2. By reasonably setting the number of lenses and the combination of optical power in the infrared optical lens, the lens of the present invention can achieve the effect of a large aperture of F1.0, thereby improving the imaging effect in low-light environments.

[0041] As a preferred embodiment of the present invention, 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 are all glass lenses, and an all-glass lens combination is adopted. On the one hand, the complexity of the structure is reduced, and on the other hand, the overall thermal expansion coefficient of the lens is reduced, thereby improving the stability of the lens in harsh climatic environments (extremely cold or extremely hot environments).

[0042] Beneficial effects

[0043] Compared with existing technologies, the advantages of this invention are as follows: By rationally setting the number of lenses and the combination of optical power in the infrared optical lens, this invention enables the infrared optical lens to have a larger aperture, increasing the light transmission of the lens and greatly improving the imaging effect of the vehicle-mounted infrared lens in low light conditions. Simultaneously, by rationally configuring the refractive index of each lens and the spacing between adjacent lenses, this invention's infrared optical lens possesses advantages such as a large image area, high pixel count, compact structure, and high cost-effectiveness. Attached Figure Description

[0044] 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 these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted infrared large-aperture lens according to Embodiment 1 of the present invention;

[0046] Figure 2 This is a fan-shaped diagram of the infrared large-aperture lens in Embodiment 1 of the present invention;

[0047] Figure 3 This is a schematic diagram of field curvature and distortion of the infrared large aperture lens in Embodiment 1 of the present invention;

[0048] Figure 4 This is a schematic diagram of the transverse axis aberration of the infrared large aperture lens in Embodiment 1 of the present invention;

[0049] Figure 5 This is a schematic diagram of the structure of a vehicle-mounted infrared large-aperture lens according to Embodiment 2 of the present invention;

[0050] Figure 6 This is a fan-shaped diagram of the infrared large-aperture lens in Embodiment 2 of the present invention;

[0051] Figure 7 This is a schematic diagram of field curvature and distortion of the infrared large-aperture lens in Embodiment 2 of the present invention;

[0052] Figure 8 This is a schematic diagram of the transverse axis aberration of the infrared large aperture lens in Embodiment 2 of the present invention;

[0053] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Aperture; 5. Fourth lens; 6. Fifth lens; 7. Sixth lens; 8. Seventh lens; 9. Eighth lens. Detailed Implementation

[0054] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all 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.

[0055] Example 1

[0056] Reference Figure 1 As shown, this embodiment provides a vehicle-mounted infrared large-aperture lens. The optical system of the lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 5, a fifth lens 6, a sixth lens 7, a seventh lens 8, and an eighth lens 9 arranged sequentially along the optical axis. An aperture stop 4 is provided between the third lens 3 and the fourth lens 5. The first lens 1, the fourth lens 5, and the eighth lens 9 are negative lenses, while the second lens 2, the third lens 3, the fifth lens 6, the sixth lens 7, and the seventh lens 8 are positive lenses. The seventh lens 8 and the eighth lens 9 are combined to form a cemented lens. All lenses in the optical system of this embodiment are all-glass lenses.

[0057] As a preferred embodiment, the first lens 1, the fourth lens 5, and the eighth lens 9 are all biconcave lenses, and the third lens 3, the sixth lens 7, and the seventh lens 8 are all biconvex lenses; the image-side surface of the second lens 2 and the fifth lens 6 is convex, and the object-side surface is convex; the above surface design facilitates the realization of the above optical power matching method, thereby improving the imaging quality.

[0058] As a preferred embodiment, the focal lengths of different lenses in the optical system satisfy the following conditions:

[0059] -10.02mm≤f1≤-13.23mm;

[0060] 50.10mm≤f2≤55.55mm;

[0061] 11.35mm≤f3≤14.95mm;

[0062] -8.20mm≤f4≤-6.75mm;

[0063] 15.1mm≤f5≤19.05mm;

[0064] 13.5mm≤f6≤17.6mm;

[0065] 7.20mm≤f7≤10.75mm;

[0066] -10.51mm≤f8≤-7.05mm;

[0067] Wherein, f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 5, the fifth lens 6, the sixth lens 7, the seventh lens 8, and the eighth lens 9, respectively; by constraining the focal lengths of each lens within the above range, it is easier to improve the imaging quality of the lens in low-light environments, which helps to correct tolerances and ensure the assembly quality of the process.

[0068] As a preferred embodiment, the refractive indices of different lenses in the optical system satisfy the following condition:

[0069] 1.71≤Nd1≤1.85;

[0070] 1.80≤Nd2≤1.87;

[0071] 1.88≤Nd3≤1.95;

[0072] 1.89≤Nd4≤1.95;

[0073] 1.72≤Nd5≤1.85;

[0074] 1.68≤Nd6≤1.80;

[0075] 1.62≤Nd5≤1.805;

[0076] 1.62≤Nd5≤1.805;

[0077] Among them, Nd1, Nd2, Nd3, Nd4, Nd5, Nd6, Nd7, and Nd8 are the refractive indices of the optical materials of the first lens 1, the second lens 2, the third lens 3, the fourth lens 5, the fifth lens 6, the sixth lens 7, the seventh lens 8, and the eighth lens 9, respectively.

[0078] As a preferred embodiment, the spacing between adjacent lenses in the optical system satisfies the following condition:

[0079] 2.31mm≤CV1≤2.86mm;

[0080] 0.02mm≤CV2≤0.25mm;

[0081] 0.15mm≤CV3≤0.73mm;

[0082] 4.69mm≤CV4≤6.31mm;

[0083] 0.52mm≤CV5≤1.20mm;

[0084] 0.02mm≤CV6≤0.15mm;

[0085] 0.00mm≤CV7≤0.17mm;

[0086] 4.55mm≤CV8≤6.75mm;

[0087] Wherein, CV1 is the distance between the first lens 1 and the second lens 2, CV2 is the distance between the second lens 2 and the third lens 3, CV3 is the distance between the third lens 3 and the aperture 4, CV4 is the distance between the aperture 4 and the fourth lens 5, CV5 is the distance between the fourth lens 5 and the fifth lens 6, CV6 is the distance between the fifth lens 6 and the sixth lens 7, CV7 is the distance between the sixth lens 7 and the seventh lens 8, and CV8 is the distance between the third lens 3 and the fourth lens 5.

[0088] As a preferred embodiment, the effective focal length of the optical system is 7.5mm≤EFL≤10.1mm; the optical back focal length of the optical system is 4.50mm≤BFL≤6.00mm.

[0089] As a preferred embodiment, the aperture of the optical system is 0.90≤F / NO≤1.2. By reasonably setting the number of lenses and the combination of optical power in the infrared optical lens, the lens of the present invention can achieve the effect of a large aperture of F1.0, thereby improving the imaging effect in low-light environments.

[0090] In this embodiment, the optical physical parameters of the first lens to the eighth lens are shown in Table 1 below:

[0091] Table 1 Optical physical parameters of the first to eighth lenses

[0092]

[0093]

[0094] The surface numbers in Table 1 are assigned according to the surface sequence of each lens. Serial number "1" represents the front surface of the first lens, and so on, with serial number "7" representing the aperture stop. 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. "Infinity" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the central axial distance between the current surface and the next surface. The refractive index (Nd) represents the ability of the material between the current and next surfaces to deflect light, and the Abbe number (Vd) represents the dispersion characteristics of the material between the current and next surfaces.

[0095] Figure 2 The image shows the ray-fan diagram of the infrared large-aperture lens in this embodiment, representing the difference between the coordinates of the intersection point of the ray and the image plane and the coordinates of the intersection point of the principal ray and the image plane. The horizontal axis scale of the ray-fan diagram is the normalized entrance pupil coordinate. The differences between the three different wavelengths of light in the figure at different field of view angles of this infrared large-aperture lens are all within a small range, indicating that the infrared large-aperture lens has a good chromatic aberration correction effect, which is beneficial to improving the lens's pixel count.

[0096] Figure 3 This is a schematic diagram of field curvature and distortion of the infrared large-aperture lens in this embodiment. In the diagram, on the left coordinate system, the horizontal axis represents the magnitude of the field curvature in mm; the vertical axis represents the normalized image height (unitless); where T represents meridion and S represents arc distortion; the three different wavelengths of light in the diagram are effectively controlled in the field curvature of this infrared large-aperture lens, meaning that during imaging, the difference in image quality between the center and the periphery is small; on the right coordinate system, the horizontal axis represents the magnitude of distortion in %; the vertical axis represents the normalized image height (unitless); from Figure 3 As can be seen, the distortion of the infrared large aperture lens provided in this embodiment is within 16%, which is well corrected, and the imaging distortion is small, meeting the requirements for low distortion.

[0097] Figure 4 This is a schematic diagram of the transverse aberration of the infrared large-aperture lens in this embodiment. The vertical axis in the figure is a dimensionless quantity, representing the normalized entrance pupil radius, and the horizontal axis represents the distance from the image plane to the intersection of the light ray and the optical axis. The aberration of this infrared optical lens is within ±0.04mm at three different wavelengths, indicating that the transverse aberration of this infrared optical lens is well corrected.

[0098] Example 2

[0099] Reference Figure 5As shown, this embodiment provides a vehicle-mounted infrared large-aperture lens. The difference from Embodiment 1 is that it also includes a filter disposed on one side of the image plane of the eighth lens. Furthermore, the optical physical parameters of the first to eighth lenses in this embodiment are different from those in Embodiment 1. The optical physical parameters of the first to eighth lenses in this embodiment are shown in Table 2 below:

[0100] Table 2 Optical physical parameters of the first to eighth lenses

[0101] Serial Number Surface type radius of curvature thickness Material (Nd) Materials (vd) Half diameter OBJ STANDARD Infinity Infinity 1 STANDARD -75.61106 0.900 1.7725 49.61 14.944 2 STANDARD 10.53721 2.651 13.197 3 STANDARD -80.43296 2.700 1.6476 33.84 13.216 4 STANDARD -29.26951 0.100 13.795 5 STANDARD 12.75732 4.300 1.8830 40.87 14.200 6 STANDARD -61.25521 0.520 13.423 7 STANDARD Infinity 5.048 12.783 8 STANDARD -9.791808 0.750 1.9229 18.9 10.191 9 STANDARD 22.54549 0.710 10.892 10 STANDARD Infinity 3.650 1.8061 40.94 10.938 11 STANDARD -11.42237 0.080 12.015 12 STANDARD Infinity 0.000 12.240 13 STANDARD 17.50021 3.800 1.7550 52.33 13.512 14 STANDARD -37.46796 0.080 13.667 15 STANDARD 14.40269 4.400 1.6968 55.53 13.366 16 STANDARD -11.76041 1.200 1.7174 29.51 12.975 17 STANDARD 18.52032 1.500 11.095 18 STANDARD Infinity 0.700 1.5268 64.21 10.859 19 STANDARD Infinity 4.427 10.692 IMA STANDARD Infinity 9.132

[0102] The surface numbers in Table 1 are assigned according to the surface sequence of each lens. Serial number "1" represents the front surface of the first lens, and so on, with serial number "7" representing the aperture stop. "OJB" indicates the object plane, and "IMA" indicates the image plane. 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. "Infinity" indicates that the surface is flat and the radius of curvature is infinite. Thickness represents the central axial distance between the current surface and the next surface. Refractive index (Nd) represents the ability of the material between the current surface and the next surface to deflect light, and Abbe number (Vd) represents the dispersion characteristics of the material between the current surface and the next surface.

[0103] Figure 6 The image shows the ray-fan diagram of the infrared large-aperture lens in this embodiment, representing the difference between the coordinates of the intersection point of the ray and the image plane and the coordinates of the intersection point of the principal ray and the image plane. The horizontal axis scale of the ray-fan diagram is the normalized entrance pupil coordinate. The differences between the three different wavelengths of light in the figure at different field of view angles of this infrared large-aperture lens are all within a small range, indicating that the infrared large-aperture lens has a good chromatic aberration correction effect, which is beneficial to improving the lens's pixel count.

[0104] Figure 7 This is a schematic diagram of field curvature and distortion of the infrared large-aperture lens in this embodiment. In the diagram, on the left coordinate system, the horizontal axis represents the magnitude of the field curvature in mm; the vertical axis represents the normalized image height (unitless); where T represents meridion and S represents arc distortion; the three different wavelengths of light in the diagram are effectively controlled in the field curvature of this infrared large-aperture lens, meaning that during imaging, the difference in image quality between the center and the periphery is small; on the right coordinate system, the horizontal axis represents the magnitude of distortion in %; the vertical axis represents the normalized image height (unitless); from Figure 7 As can be seen, the distortion of the infrared large aperture lens provided in this embodiment is within 16%, which is well corrected, and the imaging distortion is small, meeting the requirements for low distortion.

[0105] Figure 8This is a schematic diagram of the transverse aberration of the infrared large-aperture lens in this embodiment. The vertical axis in the figure is a dimensionless quantity, representing the normalized entrance pupil radius, and the horizontal axis represents the distance from the image plane to the intersection of the light ray and the optical axis. The aberration of this infrared optical lens is within ±0.04mm at three different wavelengths, indicating that the transverse aberration of this infrared optical lens is well corrected.

[0106] The infrared large-aperture lens provided in this embodiment, by reasonably setting the number of lenses, the radius of curvature of the lenses, the spacing between the lenses, the type of lenses, the refractive index of the lenses, and the Abbe number of the lenses, ensures that a miniaturized, large-aperture, large-image-area, high-pixel, and cost-effective vehicle-mounted infrared lens can be achieved.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle-mounted infrared large-aperture lens, characterized in that, The optical system of the lens includes a first lens (1), a second lens (2), a third lens (3), a fourth lens (5), a fifth lens (6), a sixth lens (7), a seventh lens (8), and an eighth lens (9) arranged sequentially along the optical axis, with a total of 8 lenses; an aperture stop (4) is provided between the third lens (3) and the fourth lens (5); the first lens (1), the fourth lens (5), and the eighth lens (9) are negative lenses, and the second lens (2), the third lens (3), the fifth lens (6), the sixth lens (7), and the seventh lens (8) are positive lenses; the seventh lens (8) and the eighth lens (9) are combined to form a cemented lens; The first lens (1), the fourth lens (5), and the eighth lens (9) are all biconcave lenses; The focal lengths of different lenses in the optical system satisfy the following condition: -13.23mm≤f1≤-10.02mm; 50.10mm≤f2≤55.55mm; 11.35mm≤f3≤14.95mm; -8.20mm≤f4≤-6.75mm; 15.1mm≤f5≤19.05mm; 13.5mm≤f6≤17.6mm; 7.20mm≤f7≤10.75mm; -10.51mm≤f8≤-7.05mm; Among them, f1, f2, f3, f4, f5, f6, f7, and f8 are the focal lengths of the first lens (1), the second lens (2), the third lens (3), the fourth lens (5), the fifth lens (6), the sixth lens (7), the seventh lens (8), and the eighth lens (9), respectively.

2. The vehicle-mounted infrared large-aperture lens as described in claim 1, characterized in that, The refractive indices of different lenses in the optical system satisfy the following condition: 1.71≤Nd1≤1.85; 1.80≤Nd2≤1.87; 1.88≤Nd3≤1.95; 1.89≤Nd4≤1.95; 1.72≤Nd5≤1.85; 1.68≤Nd6≤1.80; 1.62≤Nd5≤1.805; 1.62≤Nd5≤1.805; Among them, Nd1, Nd2, Nd3, Nd4, Nd5, Nd6, Nd7, and Nd8 are the refractive indices of the optical materials of the first lens (1), the second lens (2), the third lens (3), the fourth lens (5), the fifth lens (6), the sixth lens (7), the seventh lens (8), and the eighth lens (9), respectively.

3. The vehicle-mounted infrared large-aperture lens as described in claim 1, characterized in that, The spacing between adjacent lenses in the optical system satisfies the following condition: 2.31mm≤CV1≤2.86mm; 0.02mm≤CV2≤0.25mm; 0.15mm≤CV3≤0.73mm; 4.69mm≤CV4≤6.31mm; 0.52mm≤CV5≤1.20mm; 0.02mm≤CV6≤0.15mm; 0.00mm≤CV7≤0.17mm; 4.55mm≤CV8≤6.75mm; Wherein, CV1 is the distance between the first lens (1) and the second lens (2), CV2 is the distance between the second lens (2) and the third lens (3), CV3 is the distance between the third lens (3) and the aperture (4), CV4 is the distance between the aperture (4) and the fourth lens (5), CV5 is the distance between the fourth lens (5) and the fifth lens (6), CV6 is the distance between the fifth lens (6) and the sixth lens (7), CV7 is the distance between the sixth lens (7) and the seventh lens (8), and CV8 is the distance between the third lens (3) and the fourth lens (5).

4. The vehicle-mounted infrared large-aperture lens as described in claim 1, characterized in that, The effective focal length of the optical system is 7.5mm ≤ EFL ≤ 10.1mm; the optical back focal length of the optical system is 4.50mm ≤ BFL ≤ 6.00mm.

5. A vehicle-mounted infrared large-aperture lens as described in claim 1, characterized in that, The aperture of the optical system is: 0.90≤F / NO≤1.

2.

6. The vehicle-mounted infrared large-aperture lens as described in claim 1, characterized in that, The first lens (1), the second lens (2), the third lens (3), the fourth lens (5), the fifth lens (6), the sixth lens (7), the seventh lens (8), and the eighth lens (9) are all glass lenses.

Images