An ultra-wide-angle large-target low-distortion lens

Abstract

This invention belongs to the field of ultra-wide-angle lens technology, specifically an ultra-wide-angle large-area low-distortion lens, comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. Along the optical path, this invention consists of ten lenses and filters. By using a negative-power meniscus lens bent towards the aperture stop in the first lens, the field of view (FOV) is expanded to 120° and coma and spherical aberration are suppressed. The aperture stop is centered, forming a symmetrical structure to further correct astigmatism and distortion. Four plastic aspherical lenses are used to reduce spherical aberration and compress the overall length. The eighth and ninth lenses are bonded together using high-dispersion-difference materials to eliminate chromatic aberration. This scheme controls optical distortion to within 10%, adapts to a 1” large-area chip, and combines the advantages of small size, high resolution, low noise in low light, and large depth of field, achieving a balance between a large field of view, low distortion, and high-definition imaging.

Description

Technical Field

[0001] This invention belongs to the field of ultra-wide-angle lens technology, specifically an ultra-wide-angle lens with a large target area and low distortion. Background Technology

[0002] Ultra-wide-angle lenses typically refer to optical lenses with focal lengths between 12mm and 24mm. Their field of view can exceed 100°, covering vast scenes beyond the limits of human vision. Early ultra-wide-angle lenses suffered from severe image distortion due to limitations in the refractive index of optical glass and challenges in controlling edge aberrations. However, the widespread adoption of low-dispersion lenses, aspherical molding technology, and computer-aided optical path design in the late 20th century significantly improved edge image quality and color reproduction. Their core function is to maximize the horizontal field of view, capturing the foreground and background completely in narrow spaces (such as indoors or canyons), enhancing the spatial depth and perspective of the image.

[0003] Existing ultra-wide-angle lenses generally suffer from significant lens distortion, resulting in severe distortion of the photographed object; their small lens surface, typically designed for 1 / 2.7” to 1 / 1.8” chips, leads to lower resolution, high image noise in low light conditions, and a small depth of field, resulting in less than ideal shooting effects.

[0004] Therefore, the present invention provides an ultra-wide-angle lens with a large target area and low distortion. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the present invention provides an ultra-wide-angle large target surface low distortion lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens in sequence from the object side to the image side, and the aperture stop is located between the fifth lens and the sixth lens. The third, sixth, seventh, and tenth lenses are all plastic aspherical lenses; The first lens has negative refractive power, with its object-side surface being convex and its image-side surface being concave. The second lens has positive refractive power, with its object-side surface being convex and its image-side surface being convex. The third lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave. The fourth lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave.

[0007] Preferably, the fifth lens has positive refractive power, and the object-side surface of the lens is convex, and the image-side surface of the lens is convex.

[0008] Preferably, the sixth lens has positive diopter, and the object-side surface of the lens is convex, and the image-side surface of the lens is convex.

[0009] Preferably, the seventh lens has negative refractive power, and the object-side surface of the lens is concave, and the image-side surface of the lens is also concave.

[0010] Preferably, the eighth lens has positive diopter, the object side of the lens is concave, and the image side of the lens is convex.

[0011] Preferably, the ninth lens has negative refractive power, the object side of the lens is concave, and the image side of the lens is convex.

[0012] Preferably, the tenth lens has negative refractive power, the object side of the lens is convex, and the image side of the lens is concave.

[0013] Preferably, both the first lens and the tenth lens are provided with a housing on their outer sides. An elastic arc plate is attached to the outer side of the housing. A pair of symmetrically distributed mounting blocks are fixedly connected to the inner wall of the elastic arc plate. A pair of mounting grooves adapted to the mounting blocks are opened on the outer side of the housing. A reinforcing block is fixedly connected to the inner top wall of the elastic arc plate. A reinforcing hole adapted to the reinforcing block is opened on the top of the housing. A connecting frame is fixedly connected to the top of the elastic arc plate. A miniature electric push rod and a controller are fixedly connected to the inner top wall of the connecting frame. A connecting pipe is fixedly connected to the telescopic end of the miniature electric push rod. A spray plate is fixedly connected to the side of the connecting pipe. A spray hole is opened on the side of the spray plate away from the connecting pipe. The bottom end of the connecting tube is fixedly connected to a hollow plate. A micro pump and a controller are installed inside the hollow plate. A micro motor and a controller are fixedly connected to the side of the hollow plate near the connecting frame. A sponge plate is fixedly connected to the output end of the micro motor. The projection of the side of the sponge plate away from the hollow plate in the vertical direction is flush with the side of the first lens and the tenth lens. Sensors and controllers are installed inside the hollow plate, and an alarm and indicator light are fixedly connected to the side of the hollow plate away from the micro motor.

[0014] Preferably, a baffle is fixedly connected to the outer side of the connecting frame by a fixing block, and the side of the baffle away from the fixing block abuts against the sponge board.

[0015] The beneficial effects of this invention are as follows: 1. The present invention discloses an ultra-wide-angle, large-area, low-distortion lens. The present invention comprises ten lenses and filters arranged sequentially along the optical path. By employing a negative-power meniscus lens bent towards the aperture stop in the first lens, the field of view (FOV) is expanded to 120° and coma and spherical aberration are suppressed. The aperture stop is centered, forming a symmetrical structure to further correct astigmatism and distortion. Four plastic aspherical lenses are used to reduce spherical aberration and compress the overall length. The eighth and ninth lenses are cemented with high-dispersion materials to eliminate chromatic aberration. This scheme controls optical distortion to within 10%, adapts to a 1" large-area chip, and combines the advantages of small size, high resolution, low noise in low light, and large depth of field, achieving a balance between a large field of view, low distortion, and high-definition imaging.

[0016] 2. The ultra-wide-angle, large-area, low-distortion lens of this invention is used in the following way: First, the elastic arc-shaped plate is fitted onto the outer shell. The mounting block and reinforcing block are embedded into the corresponding slots for secure assembly. During cleaning, the micro electric push rod is activated to drive the connecting pipe and spray plate to move down, so that the spray plate is aligned with the lens surface. The micro pump sprays the cleaning agent onto the lens surface through the spray hole to soften the adhering substances. Finally, the micro motor drives the sponge plate to rotate and wipe, completing the cleaning. Its principle is to replace manual operation by using precise positioning of mechanical structure and automated spraying and wiping to replace manual operation. Regular cleaning of the lens surface can effectively remove dust, oil and other obstructions, avoid problems such as image blurring and color shift caused by abnormal light refraction, ensure stable light transmittance and optical performance, extend the lens life, and ensure that the ultra-wide-angle lens continuously outputs clear and sharp high-quality images in landscape and architectural photography. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is an MTF curve diagram of Embodiment 1 of the present invention; Figure 2 This is a field curvature and distortion curve diagram of Embodiment 1 of the present invention; Figure 3 This is a vertical color difference curve diagram of Embodiment 1 of the present invention; Figure 4 This is the MTF curve diagram of Embodiment 2 of the present invention; Figure 5 This is a field curvature and distortion curve diagram of Embodiment 2 of the present invention; Figure 6 This is a vertical axis color difference curve diagram of Embodiment 2 of the present invention; Figure 7 This is the MTF curve diagram of Embodiment 3 of the present invention; Figure 8 This is a field curvature and distortion curve diagram of Embodiment 3 of the present invention; Figure 9 This is a vertical axis color difference curve diagram of Embodiment 3 of the present invention; Figure 10This is the MTF curve diagram of Embodiment 4 of the present invention; Figure 11 This is the field curvature and distortion curve diagram of Embodiment 4 of the present invention; Figure 12 This is the vertical color difference curve diagram of Embodiment 4 of the present invention; Figure 13 This is the MTF curve diagram of Embodiment 5 of the present invention; Figure 14 This is the field curvature and distortion curve diagram of Embodiment 5 of the present invention; Figure 15 This is the MTF curve diagram of Embodiment 5 of the present invention; Figure 16 This is the optical path diagram of the present invention; Figure 17 This is a schematic diagram of the hollow plate of the present invention; Figure 18 This is the invention Figure 17 Partial schematic diagram at point A in the middle; Figure 19 This is a schematic diagram of the elastic arc-shaped plate of the present invention; Figure 20 This is the invention Figure 19 Partial schematic diagram at point B in the middle; Figure 21 This is a schematic diagram of the back of the spray plate of the present invention.

[0019] In the diagram: 1. Outer shell; 2. Elastic curved plate; 3. Mounting block; 4. Mounting groove; 5. Reinforcing block; 6. Reinforcing hole; 7. Connecting frame; 8. Miniature electric push rod; 9. Connecting pipe; 10. Spray plate; 11. Spray hole; 12. Hollow plate; 13. Miniature motor; 14. Sponge board; 15. Alarm; 16. Indicator light; 17. Baffle. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] Example 1: As Figure 16 As shown in the embodiment of the present invention, an ultra-wide-angle large target surface low distortion lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens in sequence from the object side to the image side, with the aperture stop located between the fifth lens and the sixth lens. The first lens: 1.95 < n_d < 2.15, 15 < v_d < 25; the second lens: 1.95 < n_d < 2.15, 15 < v_d < 25; the third lens: 1.5 < n_d < 1.55, 53 < v_d < 60; the fourth lens: 1.75 < n_d < 1.88, 20 < v_d < 28; the fifth lens: 1.85 < n_d < 1.95, 35 < v_d < 42; the sixth lens: 1.5 < n_d < 1.6, 50 < v_d < 60; the seventh lens: 1.6 < n_d < 1.7, 17 < v_d < 25; the eighth lens: 1.55 < n_d < 1.65, 60 < v_d < 73; the ninth lens: 1.8 < n_d < 1.95, 20 < v_d < 28; the tenth lens: 1.6 < n_d < 1.7, 17 < v_d < 25; The first lens: 11 < |f1| < 14; the second lens: 14 < |f2| < 20; the third lens: 8 < |f3| < 10; the fourth lens: 40 < |f4| < 90; the fifth lens: 7 < |f5| < 8.5; the sixth lens: 8 < |f6| < 10; the seventh lens: 14 < |f7| < 18; the eighth lens: 6 < |f8| < 10; the ninth lens: 8 < |f9| < 13; the tenth lens: 70 < |f10| < 100; The third lens, the sixth lens, the seventh lens and the tenth lens are all plastic aspheric lenses; The first lens has negative dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the second lens has positive dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface; The third lens has negative dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the fourth lens has negative dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface.

[0022] The fifth lens has positive dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface.

[0023] The sixth lens has positive dioptric power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface.

[0024] The seventh lens has negative dioptric power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface.

[0025] The eighth lens has positive dioptric power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface.

[0026] The ninth lens has negative dioptric power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface.

[0027] The tenth lens has negative refractive power, the object side of the lens is convex, and the image side of the lens is concave.

[0028] like Figure 1-3 As shown, the MTF is greater than 0.5 at the center of 200p / mm and greater than 0.19 across the entire field of view, satisfying the requirements for high-definition imaging in the 1” image plane. The curves of each wavelength are concentrated, and the system has low field curvature and chromatic aberration. Optical distortion is <10%, ensuring undistorted imaging. The transverse chromatic aberration of each wavelength is less than 4µm, demonstrating good chromatic aberration correction. In the existing technology, existing ultra-wide-angle lenses generally suffer from large lens distortion, resulting in severe distortion of the photographed objects; the lens surface is small, usually adapted to 1 / 2.7” to 1 / 1.8” chips, resulting in low resolution, high image noise in low light conditions, and a small depth of field, thus making the shooting effect less than ideal. In use, light rays pass sequentially from the object plane to the image plane through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the filter. By using a negative power meniscus lens with a curved aperture in the first lens, the angle of the outgoing light corresponding to a large incident angle can be reduced, so that the FOV of the lens can reach 120°. At the same time, the curved aperture design reduces the coma and spherical aberration of the system. The aperture stop is located between the fifth and sixth lenses, so that there are five lenses in front of and behind the aperture stop. The symmetrical structure can reduce coma, astigmatism and distortion of the system. Four plastic aspherical lenses are used to reduce spherical aberration, improve lens utilization efficiency, and reduce system length; The eighth and ninth lenses are bonded together using materials with a dispersion coefficient difference greater than 30, effectively reducing chromatic aberration in the optical system. The lens of this invention has a focal length of f=5.2mm, FOV≥120°, a wide shooting range, optical distortion<10%, no distortion of the captured object, TTL<36.2mm, small size, and image height≥16.4mm, meeting the requirements for high-resolution chip imaging with a large target surface of 1”. Compared with small target surface chips of the same resolution, the 1” chip has a large pixel, low image noise and a large depth of field under low light conditions, and MTF is greater than 0.5 at the center of the 200lp / mm frequency range and greater than 0.19 across the entire field of view, meeting the requirements for high-definition imaging.

[0029] Based on the above points, this invention, through the rational selection of lens structure and materials, effectively corrects spherical aberration, coma, astigmatism, distortion, and chromatic aberration, achieving an imaging lens solution with a large field of view, low distortion, large image plane, and high resolution.

[0030] In summary, this invention comprises ten lenses and filters arranged sequentially along the optical path. By employing a negative-power meniscus lens bent towards the aperture stop in the first lens, the field of view (FOV) is expanded to 120°, and coma and spherical aberration are suppressed. The aperture stop is centered, forming a symmetrical structure to further correct astigmatism and distortion. Four plastic aspherical lenses are selected to reduce spherical aberration and compress the overall length. The eighth and ninth lenses are cemented with high dispersion materials to eliminate chromatic aberration. This scheme controls optical distortion to within 10%, is compatible with 1" large target surface chips, and combines the advantages of small size, high resolution, low noise in low light, and large depth of field, achieving a balance between a large field of view, low distortion, and high-definition imaging.

[0031] Example 2: Figure 4-6 As shown in the comparison with Embodiment 1, another embodiment of the present invention is as follows: the MTF is greater than 0.5 at the center of 200p / mm and greater than 0.19 in the entire field of view, which satisfies the high-definition imaging of the 1” image plane, the curves of each wavelength are concentrated, the field curvature and chromatic aberration of the system are small; the optical distortion is <10%, the imaging is not distorted, the transverse chromatic aberration of each wavelength is less than 4um, and the chromatic aberration correction effect is good.

[0032] Example 3: Figure 7-9 As shown in the comparison with Embodiment 1, another embodiment of the present invention is as follows: the MTF is greater than 0.5 at the center of 200p / mm and greater than 0.19 in the entire field of view, which satisfies the high-definition imaging of the 1” image plane, the curves of each wavelength are concentrated, the field curvature and chromatic aberration of the system are small; the optical distortion is <10%, the imaging is not distorted, the transverse chromatic aberration of each wavelength is less than 4um, and the chromatic aberration correction effect is good.

[0033] Example 4: Figure 10-12 As shown in the comparison with Embodiment 1, another embodiment of the present invention is as follows: the MTF is greater than 0.5 at the center of 200p / mm and greater than 0.19 in the entire field of view, which satisfies the high-definition imaging of the 1” image plane, the curves of each wavelength are concentrated, the field curvature and chromatic aberration of the system are small; the optical distortion is <10%, the imaging is not distorted, the transverse chromatic aberration of each wavelength is less than 4um, and the chromatic aberration correction effect is good.

[0034] Example 5: Figure 13-15 As shown in the comparison with Embodiment 1, another embodiment of the present invention is as follows: the MTF is greater than 0.5 at the center of 200p / mm and greater than 0.19 in the entire field of view, which satisfies the high-definition imaging of the 1” image plane, the curves of each wavelength are concentrated, the field curvature and chromatic aberration of the system are small; the optical distortion is <10%, the imaging is not distorted, the transverse chromatic aberration of each wavelength is less than 4um, and the chromatic aberration correction effect is good.

[0035] Example 6: Figure 17-21As shown in the comparative embodiment one, another embodiment of the present invention is as follows: both the first lens and the tenth lens are provided with a housing 1 on their outer sides, an elastic arc plate 2 is attached to the outer side of the housing 1, a pair of symmetrically distributed mounting blocks 3 are fixedly connected to the inner wall of the elastic arc plate 2, a pair of mounting grooves 4 adapted to the mounting blocks 3 are opened on the outer side of the housing 1, a reinforcing block 5 is fixedly connected to the inner top wall of the elastic arc plate 2, and a reinforcing hole 6 adapted to the reinforcing block 5 is opened on the top of the housing 1; The top of the elastic arc plate 2 is fixedly connected to a connecting frame 7. A miniature electric push rod 8 and a controller are fixedly connected to the inner top wall of the connecting frame 7. A connecting pipe 9 is fixedly connected to the telescopic end of the miniature electric push rod 8. A spray plate 10 is fixedly connected to the side of the connecting pipe 9. A spray hole 11 is opened on the side of the spray plate 10 away from the connecting pipe 9. The bottom end of the connecting pipe 9 is fixedly connected to a hollow plate 12. A micro pump and a controller are installed inside the hollow plate 12. A micro motor 13 and a controller are fixedly connected to the side of the hollow plate 12 near the connecting frame 7. A sponge plate 14 is fixedly connected to the output end of the micro motor 13. The projection of the side of the sponge plate 14 away from the hollow plate 12 in the vertical direction is flush with the side of the first lens and the tenth lens. The hollow plate 12 is equipped with a sensor and a controller. An alarm 15 and an indicator light 16 are fixedly connected to the side of the hollow plate 12 away from the micro motor 13. An inlet pipe is fixedly connected to the hollow plate 12, and a sealing cap is fitted on the inlet pipe. When the sensor detects that the cleaning agent in the hollow panel 12 is insufficient, the alarm 15 will be activated, emitting an audible and visual signal to remind personnel to add cleaning agent to the hollow panel 12 in a timely manner. During the addition of cleaning agent, when the sensor detects that the amount of cleaning agent in the hollow plate 12 has reached the set value, the indicator light 16 will be activated to emit a visual signal to remind personnel to stop adding the liquid.

[0036] The present invention is used in the following steps: Step 1: The elastic arc plate 2 is fitted onto the outer shell 1 outside the first lens and the tenth lens. At the same time, the mounting block 3 will enter the mounting groove 4, and the reinforcing block 5 will be inserted into the reinforcing hole 6, thereby improving the stability of the elastic arc plate 2 on the outer shell 1. Step 2: When cleaning the mirror surfaces of the first lens and the tenth lens, the miniature electric push rod 8 needs to be activated so that its telescopic end pushes the connecting tube 9 and all the mechanisms on it to move up and down together until the side of the spray plate 10 is opposite to the mirror surfaces of the first lens and the tenth lens. Then, the micro pump is activated to spray the cleaning agent contained in the hollow plate 12 from the nozzle 11 onto the surfaces of the first and tenth lenses, thereby reducing the intensity of foreign matter adhering to the surfaces of the first and tenth lenses. Finally, the micro motor 13 is started, and its output end drives the sponge plate 14 to rotate and wipe the mirror surfaces of the first lens and the tenth lens, thereby cleaning the mirror surfaces.

[0037] In summary, when using this invention, the elastic arc plate 2 is first fitted onto the outer shell 1, and the mounting block 3 and reinforcing block 5 are embedded into the corresponding slots for secure assembly. During cleaning, the micro electric push rod 8 is activated to drive the connecting pipe 9 and the spray plate 10 to move downwards, so that the spray plate 10 is aligned with the mirror surface. The micro pump sprays the cleaning agent onto the mirror surface through the spray hole 11 to soften the adhering substances. Finally, the micro motor 13 drives the sponge plate 14 to rotate and wipe, completing the cleaning. Its principle is to replace manual operation by using precise positioning of mechanical structure and automated spraying and wiping to replace manual operation. Regular cleaning of the mirror surface can effectively remove dust, oil and other obstructions, avoid problems such as blurred images and color shift caused by abnormal light refraction, ensure stable light transmittance and optical performance, extend the lens life, and ensure that the ultra-wide-angle lens continuously outputs clear and sharp high-quality images in landscape and architectural photography.

[0038] like Figure 19 As shown, a baffle 17 is fixedly connected to the outer side of the connecting frame 7 by a fixing block. The side of the baffle 17 away from the fixing block abuts against the sponge plate 14. The baffle 17 can seal and protect the cleaning surface of the lens from dust by the sponge plate 14, ensuring the cleanliness of the cleaning surface.

[0039] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0040] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 invention 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 limiting the scope of protection of this invention.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-wide-angle lens with a large target area and low distortion, characterized in that: It includes, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, with the aperture stop located between the fifth lens and the sixth lens; The third, sixth, seventh, and tenth lenses are all plastic aspherical lenses; The first lens has negative refractive power, with its object-side surface being convex and its image-side surface being concave. The second lens has positive refractive power, with its object-side surface being convex and its image-side surface being convex. The third lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave. The fourth lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave.

2. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The fifth lens has positive refractive power, and the object-side surface of the lens is convex, as is the image-side surface.

3. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The sixth lens has positive diopter, and the object-side surface of the lens is convex, as is the image-side surface.

4. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The seventh lens has negative refractive power, and the object-side surface of the lens is concave, as is the image-side surface.

5. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The eighth lens has positive diopter, the object side of the lens is concave, and the image side of the lens is convex.

6. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The ninth lens has negative refractive power, and its object-side surface is concave while its image-side surface is convex.

7. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: The tenth lens has negative refractive power, and its object-side surface is convex while its image-side surface is concave.

8. The ultra-wide-angle, large-area, low-distortion lens according to claim 1, characterized in that: Both the first lens and the tenth lens are provided with a housing (1) on their outer side. An elastic arc plate (2) is attached to the outer side of the housing (1). A pair of symmetrically distributed mounting blocks (3) are fixedly connected to the inner wall of the elastic arc plate (2). A pair of mounting grooves (4) adapted to the mounting blocks (3) are opened on the outer side of the housing (1). A reinforcing block (5) is fixedly connected to the inner top wall of the elastic arc plate (2). A reinforcing hole (6) adapted to the reinforcing block (5) is opened on the top of the housing (1). The top of the elastic arc plate (2) is fixedly connected to a connecting frame (7), and a micro electric push rod (8) and a controller are fixedly connected to the inner top wall of the connecting frame (7). A connecting pipe (9) is fixedly connected to the telescopic end of the micro electric push rod (8), and a spray plate (10) is fixedly connected to the side of the connecting pipe (9). A spray hole (11) is opened on the side of the spray plate (10) away from the connecting pipe (9). The bottom end of the connecting pipe (9) is fixedly connected to a hollow plate (12). The hollow plate (12) is equipped with a micro pump and a controller. The hollow plate (12) is fixedly connected to a micro motor (13) and a controller on the side near the connecting frame (7). A sponge plate (14) is fixedly connected to the output end of the micro motor (13). The projection of the side of the sponge plate (14) away from the hollow plate (12) in the vertical direction is flush with the side of the first lens and the tenth lens. The hollow plate (12) is equipped with a sensor and a controller. An alarm (15) and an indicator light (16) are fixedly connected to the side of the hollow plate (12) away from the micro motor (13).

9. The ultra-wide-angle, large-area, low-distortion lens according to claim 8, characterized in that: A baffle (17) is fixedly connected to the outside of the connecting frame (7) by a fixing block, and the side of the baffle (17) away from the fixing block abuts against the sponge board (14).

Images