Refraction correction device of underwater imaging system

Abstract

The utility model relates to the technical field of optics, and particularly discloses a refraction correction device of an underwater imaging system. Comprising a lens cone and a plurality of lenses arranged in the lens cone, and the lenses comprise an adjusting lens and an imaging lens; a plurality of bosses with different sizes are arranged in the lens barrel, and the plurality of bosses divide the interior of the lens barrel into a plurality of lens placement grooves with different sizes; one end of the shading head far away from the lens cone is provided with at least two levels of shading sheets which are arranged at angular intervals; the lens cone is provided with an imaging lens, a first adjusting lens, a second adjusting lens and a third adjusting lens along an optical axis from the imaging end to the image inlet end; and the imaging lens, the first adjusting lens, the second adjusting lens and the third adjusting lens are fixedly mounted through a plurality of lens mounting grooves with different sizes. In this way, the optical system can better capture and reproduce details of the object, and therefore better visual experience is provided for a user.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a refraction correction device for an underwater imaging system. Background Art

[0002] During underwater imaging, cameras often encounter a critical challenge: the refraction of light underwater. Refraction correction is required for underwater imaging primarily because the optical properties of water and air differ significantly, causing light to refract as it passes from one medium to the other (for example, from water to air, or vice versa). This refraction changes the direction of light propagation, resulting in image distortion, displacement, or blur, degrading underwater image quality. Because water has a higher refractive index than air, the refraction of light as it enters or leaves water distorts the image, making objects appear to differ from their actual shape. Underwater, the camera's focal length also changes because the refraction of light through water affects the lens's focusing ability. This can result in blurred or out-of-focus images. Different wavelengths of light are absorbed and scattered to varying degrees, resulting in color deviations or distortion in underwater images. When a camera or lens is partially or fully submerged in water, refraction can reduce the camera's effective field of view, reducing the captured scene and degrading the image quality.

[0003] The patent "Underwater Imaging Camera" (publication number CN210629637U, hereinafter referred to as Prior Art 1) discloses that Prior Art 1 uses an underwater imaging camera to capture real-time underwater footage, while also enabling backup, upload, and online live streaming. The camera consists of multiple components, including a camera and a fill light. The camera comprises a stainless steel housing, a bracket, a control program mainboard, a high-definition camera head, a first sealing silicone gasket, a front cover, a rear cover, a first high-transparency pressure glass lens, a high-speed USB transmission port, a memory card slot and SD card slot, an RJ45 network port, and a six-core watertight connector. The fill light comprises a stainless steel housing, a high-brightness LED lamp, a stainless steel lamp cover, a second high-transparency pressure glass lens, a second sealing silicone gasket, an aluminum focusing cup, an insulating plastic gasket with a boss, a two-core watertight connector, and a heat dissipation mounting gasket. The control program mainboard is located inside the mounting bracket and connected to it via screws. The network RJ45 port and USB high-speed transmission port are located on the control program mainboard. The SD card is inserted into the SD card slot on the control program mainboard. The real-time uploading of the shooting picture is realized through the control program mainboard, and the shooting picture is backed up through the memory card, which can be downloaded through the control program when needed.

[0004] Although existing technology 1 already enables real-time image upload and backup, it faces a significant problem in practical applications when the camera is operating underwater. Light in water undergoes multiple refractions at varying angles, severely impacting the image quality when it enters the camera's imaging lens. This refraction causes the captured image to become blurry, with loss of detail and distorted colors, thus compromising image quality and usability. Therefore, despite its excellent performance in other aspects, technology 1's imaging performance in underwater environments remains unsatisfactory and requires further improvement and optimization. Utility Model Content

[0005] In view of this, an embodiment of the present invention provides a refraction correction device for an underwater imaging system, so as to solve the problem of poor imaging effect of the imaging device when performing imaging underwater.

[0006] An embodiment of the present utility model provides a refraction correction device for an underwater imaging system, comprising a lens barrel and a plurality of lenses arranged inside the lens barrel, the lenses comprising an adjusting lens and an imaging lens; a plurality of bosses of different sizes are provided inside the lens barrel, and the plurality of bosses divide the interior of the lens barrel into a plurality of lens mounting grooves of different sizes; the two ends of the lens barrel are respectively an imaging end and an image feed end; the lens barrel is provided with a light shielding head at the image feed end; the light shielding head is provided with at least two levels of light shielding plates arranged at angular intervals on an end away from the lens barrel; the lens barrel is provided with an imaging lens, a first adjusting lens, a second adjusting lens and a third adjusting lens along the optical axis from the imaging end to the image feed end; the imaging lens, the first adjusting lens, the second adjusting lens and the third adjusting lens are fixedly installed through the plurality of lens mounting grooves of different sizes to form a correction path.

[0007] Preferably, the light shielding sheet includes a first-stage light shielding sheet and a second-stage light shielding sheet; the first-stage light shielding sheet and the second-stage light shielding sheet are tilted at different angles to the lens barrel.

[0008] Preferably, the first-stage shading sheet and the second-stage shading sheet are respectively provided with four shading leaves; the first-stage shading sheet and the second-stage shading sheet are both arranged at even intervals.

[0009] Preferably, the first-stage light shielding sheet is arranged parallel to the lens barrel; the second-stage light shielding sheet is arranged on the inner side of the first-stage light shielding sheet; the second-stage light shielding sheet is arranged to be retracted and tilted toward the axis of the lens barrel.

[0010] Preferably, the lens barrel is provided with a fourth adjustment lens at the junction of the light shielding head and the lens barrel.

[0011] Preferably, the first adjustment lens is a composite lens; the composite lens is composed of a biconvex aspheric lens and a lens with a concave surface; the biconvex aspheric lens has one convex surface arranged in the concave surface of the lens with a concave surface; wherein the biconvex aspheric lens is a lens with positive optical power; the lens with a concave surface is a lens with negative optical power.

[0012] Preferably, the second adjustment lens is a biconvex lens with positive optical power.

[0013] Preferably, the third adjustment lens is a composite lens; the composite lens is a lens having a concave surface and a plano-convex lens having a convex surface; the concave surfaces of the lens having a concave surface in the third adjustment lens and the second adjustment lens are arranged opposite to each other.

[0014] Preferably, the fourth adjustment lens is made of a material with a high refractive index.

[0015] Preferably, the fourth adjustment lens material is MR TM -8 material, barium titanate material or flint material.

[0016] The refraction correction device for an underwater imaging system provided by the utility model has the following beneficial effects:

[0017] By providing bosses and lens mounting grooves of varying sizes, this device allows for precise positioning and fixation of each lens, thereby ensuring the stability of the entire imaging system. The device's light shielding head and multi-stage light shielding sheet at the image feed end effectively reduce stray light interference. The device's multi-stage lens design provides flexible optical adjustment capabilities. During underwater imaging, the optical characteristics of the imaging system may vary due to factors such as water depth, water pressure, and temperature. By adjusting the first, second, and third adjustment lenses, the imaging system can be finely tuned to adapt to varying underwater environments, ensuring consistently optimal imaging quality. The multi-stage lens structure of this utility model effectively corrects the refraction of incident light. As a result, after passing through the layers of refraction through these lenses, light propagates closer to the optical axis. This precise control of the light path significantly improves imaging quality, resulting in clearer and more accurate images. This allows the optical system to better capture and reproduce object details, providing users with a superior visual experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0019] Figure 1 It is a schematic structural diagram of a refraction correction device for an underwater imaging system;

[0020] Figure 2 It is a schematic diagram of the internal structure of a refraction correction device for an underwater imaging system;

[0021] Figure 3 It is a schematic diagram of the internal structure of a refractive correction device for an underwater imaging system without lenses installed;

[0022] Figure 4 is a schematic diagram of light entering;

[0023] Figure 5 It is a schematic diagram of lens distribution;

[0024] Figure 6 It is a schematic diagram of some light correction imaging;

[0025] Parts and numbers in the picture:

[0026] 100 - lens barrel, 110 - imaging lens, 121 - first adjusting lens, 122 - second adjusting lens, 123 - third adjusting lens, 124 - fourth adjusting lens;

[0027] 130-shading head, 131-first-stage shading sheet, 132-second-stage shading sheet;

[0028] 140- lens placement slot;

[0029] 151-imaging end, 152-image feed end;

[0030] 210-receivable light, 220-unreceivable light, 230-light path. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, elements defined by the phrase "comprises..." do not exclude the presence of additional identical elements in the process, method, article, or device that includes the elements. If there is no conflict, the embodiments of the present invention and the various features therein may be combined with each other and are all within the scope of protection of the present invention.

[0032] Example 1

[0033] See Figure 1 and Figure 4 The present invention provides a refraction correction device for an underwater imaging system. This device corrects the refraction of incident light through the combination of a lens and a lens barrel 100. This device effectively adjusts the path of light 200, significantly improving imaging quality and making underwater images clearer and more realistic. By applying this refraction correction technology, the imaging system can maintain stable imaging in complex underwater environments, avoiding image distortion and blurring caused by refraction, and ensuring optimal capture results.

[0034] See Figure 2 The correction device primarily consists of a lens barrel 100 and multiple lenses mounted within it. These lenses include two main categories: adjustment lenses and imaging lenses 110. To achieve optimal imaging, these lenses are arranged within the lens barrel 100 in a predetermined order and spacing. Through precise adjustment of light 200 between the individual lenses, the imaging effect can be effectively controlled and optimized, ensuring image clarity and accuracy.

[0035] See Figure 3 The internal structure of the lens barrel 100 is provided with a plurality of bosses of various sizes. These bosses protrude from the sidewalls of the lens barrel 100 into the interior of the lens barrel 100, forming a unique internal support structure. The main function of these bosses is to cleverly divide the internal space of the lens barrel 100 into a plurality of lens placement grooves 140 of different sizes. Typically, to facilitate the placement and installation of the lenses, these bosses are arranged in a stepped manner, forming a stair-like structure so that each lens can find its appropriate position.

[0036] Furthermore, to accommodate a wider range of lenses of varying sizes, lens barrel 100 is further equipped with auxiliary lens mounting tubes. These auxiliary lens mounting tubes have stepped bosses on their surfaces, further increasing the possibilities for lens placement. Once these auxiliary lens mounting tubes are installed, they are positioned within lens barrel 100, making the internal structure of the entire lens barrel 100 more complex and more functional.

[0037] In order to further improve the adaptability and flexibility of the lens barrel 100, at least two of the lens auxiliary mounting tubes can be set inside the lens barrel 100. Through such an arrangement, it is possible to ensure that lenses of different sizes and types can find a suitable position, thereby making the entire optical imaging system more stable and efficient. Such an arrangement not only improves the performance of the lens barrel 100, but also greatly enhances its applicability in various application scenarios. By utilizing these lens placement grooves 140 of different sizes, lenses of various sizes can be easily placed and fixed. In this way, each lens can find a position that suits it, ensuring the rationality of the internal structure of the lens barrel 100 and the accuracy of the optical system, and forming a correction path for the refracted light.

[0038] See Figure 2 In this embodiment, the two ends of the lens barrel 100 are respectively an imaging end 151 and an image-entering end 152. The imaging end 151 refers to the end where the light 200 enters the lens barrel 100 and ultimately forms an image, while the image-entering end 152 refers to the end where the light 200 enters the lens barrel 100. A light shielding head 130 is specially provided at the image-entering end 152 of the lens barrel 100. Its main function is to prevent stray light from entering the lens barrel 100, thereby improving imaging quality.

[0039] The light shielding head 130 is located at the image-entering end 152 of the lens barrel 100 and is provided with at least two stages of light shielding plates in a direction away from the lens barrel 100. These light shielding plates are arranged at angular intervals to ensure that stray light from different directions is effectively blocked. This multi-stage light shielding plate design can further improve the performance of the imaging system and ensure the purity and stability of the light 200 during the imaging process.

[0040] Along the optical axis, from the imaging end 151 to the image-feeding end 152, an imaging lens 110, a first adjustment lens 121, a second adjustment lens 122, and a third adjustment lens 123 are positioned in sequence. These lenses are secured in place by a number of lens mounting slots 140 of varying sizes to ensure their correct position and stability along the optical axis. The imaging lens 110 is responsible for capturing and forming the image, while the first adjustment lens 121, the second adjustment lens 122, and the third adjustment lens 123 are respectively used to adjust and optimize the image quality, ensuring image clarity and accuracy. This structural design enables the entire optical system to effectively perform imaging and adjustment to meet diverse imaging requirements.

[0041] In this embodiment, the light shielding plate is composed of two parts, namely a first-stage light shielding plate 131 and a second-stage light shielding plate 132. The two-stage light shielding plate is arranged to be tilted at different angles on the lens barrel 100. This arrangement is intended to effectively prevent the scattering of light 200 and the refraction of light 200 on the non-imaging surface, thereby improving the imaging quality. Specifically, the angle settings of the first-stage light shielding plate 131 and the second-stage light shielding plate 132 have been carefully calculated to ensure that they can minimize the entry of unnecessary light 200 into the lens, thereby reducing the impact of stray light. Through this dual-stage light shielding plate design, the contrast and clarity of the optical system can be significantly improved, ensuring that the captured images are more delicate and realistic.

[0042] In this embodiment, the first-stage light shielding sheet 131 includes four independent light shielding leaves, which are evenly spaced to ensure that light 200 is effectively blocked. Similarly, the second-stage light shielding sheet 132 is also composed of four light shielding leaves, which are also evenly spaced to further enhance the light shielding effect. This evenly spaced design not only ensures a reasonable spatial distribution between the light shielding sheets, but also allows light 200 to be more evenly blocked when passing through the light shielding sheets, thereby improving the overall light shielding performance and imaging quality.

[0043] See Figure 2In this embodiment, the first-stage light shielding sheet 131 is positioned parallel to the lens barrel 100. This parallel arrangement ensures that the light shielding sheet effectively blocks excess light 200 from outside the lens, thereby improving image quality. To further optimize the light shielding effect, the second-stage light shielding sheet 132 is positioned inward of the first-stage light shielding sheet 131. This inward arrangement allows the second-stage light shielding sheet 132 to be closer to the lens' optical elements, thereby more precisely controlling the light 200 entering the lens. Furthermore, the second-stage light shielding sheet 132 has a unique configuration: it is tilted toward the axis of the lens barrel 100. This tilted configuration not only helps further reduce interference from stray light but also ensures that light 200 passes through the lens more evenly, resulting in clearer and higher-contrast images. This dual-stage light shielding arrangement significantly improves the imaging performance of the lens, providing users with superior underwater photography and imaging results.

[0044] In this embodiment, the first adjustment lens 121 mentioned is actually a composite lens composed of multiple parts. Specifically, this composite lens is composed of a biconvex aspheric lens and a lens with a concave surface. In order to achieve a better optical effect, one convex surface of the biconvex aspheric lens is precisely placed within the concave surface of the lens with a concave surface. To further explain in detail, the biconvex aspheric lens is a lens with positive optical power, which means that it can focus the light 200. The lens with a concave surface is a lens with negative optical power, and its function is to diverge the light 200. Through this combination, fine adjustment of the light 200 can be achieved, thereby achieving the desired optical imaging effect.

[0045] Positive optical power refers to the offset of the focal position relative to the optical axis after light 200 passes through a lens or lens combination in an optical system. Specifically, positive optical power indicates the lens's ability to converge light 200, i.e., the degree to which light 200 converges toward the optical axis after passing through the lens. The greater the positive optical power, the greater the lens's convergence ability and the closer the focal point is to the lens.

[0046] See Figure 5, the second adjustment lens 122 is a biconvex lens with positive optical power. Both surfaces of this lens are convex, that is, they bulge outward, forming a shape similar to a magnifying glass. Positive optical power means that this lens can refract the incident light 200 in a direction away from the lens, so that the light 200 passing through the lens converges at one point. Such a setting enables the second adjustment lens 122 to play the role of focusing the light 200 in the optical system, and is often used to correct myopia after the incident light 200 or to magnify the details of an object. By adjusting the position or angle of this lens, the imaging quality of the optical system can be further optimized to ensure that the image is clear and distortion-free.

[0047] See Figure 5 In this embodiment, the third adjustment lens 123 is a composite lens composed of multiple lens elements. Specifically, this composite lens includes a lens element with a concave surface and a plano-convex lens element with a convex surface. These two lens elements are combined in a specific manner to achieve the desired optical effect. In addition, the concave lens element in the third adjustment lens 123 is arranged relative to the concave surface of the lens element with a concave surface in the second adjustment lens 122. This can further optimize the performance of the optical system and ensure that the light 200 achieves the desired effect when passing through these lenses. Through this arrangement, the focal length of the optical system can be effectively adjusted to meet different imaging requirements.

[0048] See Figure 5 A fourth adjustment lens 124 is installed at the connection between the light shielding head 130 and the lens barrel 100. This fourth adjustment lens 124 is made of a material with a high refractive index. As the first barrier for light 200 entering the lens, the fourth lens 124 is the first thing that comes into contact with it when light 200 enters from the outside. As light 200 enters the lens through the fourth lens, the fourth lens not only absorbs the light 200 but also refracts and corrects it.

[0049] Because the fourth lens element has a higher refractive index, it can more effectively bend the path of light 200, thereby achieving a more precise correction effect on light 200. The high-refractive-index lens element provides greater control over light 200, enabling ideal correction effects with a smaller lens thickness. This not only helps reduce the weight of the entire imaging system, but also reduces the thickness of the lens element. This reduces the overall mass of the lens barrel 100, resulting in superior imaging effects and improving the performance and portability of the imaging system.

[0050] The material of the fourth adjustment lens 124 is MR TM Lenses made of -8 material, barium titanate material and flint material have a high refractive index.

[0051] In this embodiment, materials with high refractive index and low scattering rate characteristics are specifically selected to ensure that the refractive index and scattering rate of the lens are in a relatively balanced state. Generally, the higher the refractive index of the lens material, the better the imaging effect, because the high refractive index can more effectively guide light 200 through the lens, thereby improving image clarity. However, a common problem is that many high-refractive-index lens materials are often accompanied by a high scattering rate, which can cause light 200 to be unnecessary scattered within the lens, thereby affecting image quality. This scattering phenomenon can cause light 200 to deviate from its original propagation path, resulting in blurred images, reduced contrast, and other problems.

[0052] Therefore, when selecting lens materials, two key parameters, refractive index and scattering index, must be comprehensively considered. The ideal material should possess a high refractive index to ensure effective guidance of light 200, while also maintaining a low scattering index to reduce scattering of light 200 within the lens. By selecting and optimizing the material, image quality can be improved while avoiding the negative effects of excessive scattering index. This balance not only enhances imaging quality but also ensures the stability and reliability of the lens' performance in practical applications.

[0053] MR TM The refractive index of -8 material is 1.6, and the scattering rate is roughly between 20% and 50%. This means that the material can effectively scatter light, but the specific value may vary depending on different batches of products or processing methods.

[0054] Barium titanate materials come in several types, with refractive indices ranging from 1.6 to 2.4. Depending on the classification, single-crystalline barium titanate typically has a lower scattering rate for optical applications, ranging from 1% to 10%. This is because single-crystalline materials have fewer grain boundaries and defects, which reduce scattering. Polycrystalline barium titanate materials (ceramic forms) generally have higher scattering rates, especially if the surface is not polished. The scattering rate can range from 10% to 30%, or even higher, depending on the particle size and surface roughness. Barium titanate in powder form, barium titanate powder, due to its smaller particle size, generally has a higher scattering rate. Its scattering rate can range from 30% to 50%, or even higher.

[0055] Flint materials also come in various types, each with a refractive index of 1.7. When the flint material is basalt, basalt is typically a dark rock with a relatively low scattering rate. The scattering rate can range from 10% to 30%, depending on its surface roughness and mineral composition. When the flint material is andesite, the scattering rate is also low, typically ranging from 20% to 40%. When the flint material is volcanic ash, the scattering rate is higher because its fine particles effectively scatter light. The scattering rate can range from 50% to 70%.

[0056] Therefore, the material of the lens in this embodiment is preferably single crystal barium titanate, which has a suitable refractive index and a low scattering rate, and can have a better imaging effect.

[0057] The present invention ensures that the light 200 can propagate along a predetermined path and form an image after passing through these lenses by selecting the material, shape and arrangement of the lenses. The purpose of this arrangement is to significantly reduce the distortion phenomenon in the imaging process, thereby ensuring that the final imaging effect can meet high-quality standards. In this way, the imaging system can provide clearer and more accurate images, meeting the image quality requirements of underwater imaging. Composite lenses are conducive to reducing the volume of underwater imaging lenses, with high refractive index and low scattering. Refraction is related to the thickness of the lens, and scattering is related to the imaging effect. The composite lenses are connected by a membrane, and the volume is reduced after being connected. The material uses a high refractive index and a low heat dissipation rate. Not only are the lenses light and thin, but the imaging effect is good, and there is a better imaging environment and the effect after imaging.

[0058] The auxiliary lens mounting tube can be adjusted within the lens barrel 100. Each lens is positioned to a predetermined width, with spacers between them to create a spacing effect. Once spaced, the lenses are secured within the lens barrel 100. A light shielding head 130 blocks excess light 200, preventing unwanted light from entering the lens. The lens barrel 100 is aligned with the imaging area, preventing it from receiving excess light 200 and allowing only objects within the intended range to be imaged.

[0059] When in use, the lens barrel 100 is a part of the camera and is sealed in a pressure-resistant cylinder together with the camera. The interior is fixed by a flange and outputted through a plug interface. The camera communicates with the terminal to realize imaging of the imaging system.

[0060] See Figure 4Because light refracts underwater before entering the imaging device, the incident angles of the light 200 vary, resulting in unclear images. During imaging, light 200 enters from outside the imaging end 151. This external light 200 strikes the fourth adjustment lens 124 from all angles. However, the only light 200 required is the light 200 from the object directly in front of the imaging end 151, which facilitates imaging of the object. Therefore, these stray light rays 200 are blocked by the first-stage light shielding plates 131 and the second-stage light shielding plates 132 on the light shielding head 130, preventing unwanted light 200 from entering the imaging end 151. At this point, the light 200 from the object directly in front of the imaging end 151 enters the lens barrel 100 and strikes the fourth adjustment lens 124. Upon contact with the fourth adjustment lens 124, the external light 200 is refracted. The fourth adjustment lens 124, based on its performance, corrects the refracted light 200, aligning its path closer to the optical axis. The third regulating lens 123 then regulates and focuses the light 200, allowing it to accurately pass through the third regulating lens 123 and enter the second regulating lens 122. The second regulating lens 122 focuses the light 200 closer to the optical axis. Finally, the first regulating lens 121 focuses the light 200 a second time before it is emitted onto the imaging surface for imaging, resulting in a better imaging effect.

[0061] See Figure 4 and Figure 6 Light is emitted from a light source and forms a light path 230 through the lens. The light is divided into receivable light 210 and unreceivable light 220 by the light shielding head 130. The receivable light 210 is corrected by each lens and finally transmitted to the imaging lens 110. The light is corrected through several different optical paths by each lens, and finally several imaging points are formed and converged at the imaging lens 110, finally completing the imaging of the object.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refraction correction device for an underwater imaging system, characterized in that: The invention comprises a lens barrel (100) and a plurality of lenses arranged inside the lens barrel (100), wherein the lenses include an adjustment lens and an imaging lens (110); a plurality of bosses of different sizes are arranged inside the lens barrel (100), and the plurality of bosses divide the interior of the lens barrel (100) into a plurality of lens placement grooves (140) of different sizes; The two ends of the lens barrel (100) are respectively an imaging end (151) and an image-feeding end (152); the lens barrel (100) is provided with a light shielding head (130) at the image-feeding end (152); the light shielding head (130) is provided with at least two levels of light shielding sheets arranged at angular intervals on an end away from the lens barrel (100); The lens barrel (100) is provided with an imaging lens (110), a first adjustment lens (121), a second adjustment lens (122), and a third adjustment lens (123) along an optical axis from the imaging end (151) to the image feed end (152); the imaging lens (110), the first adjustment lens (121), the second adjustment lens (122), and the third adjustment lens (123) are fixedly installed through a plurality of lens placement grooves (140) of different sizes to form a correction path.

2. The refraction correction device for an underwater imaging system according to claim 1, characterized in that: The light shielding sheet comprises a first-stage light shielding sheet (131) and a second-stage light shielding sheet (132); the first-stage light shielding sheet (131) and the second-stage light shielding sheet (132) are tilted at different angles relative to the lens barrel (100).

3. The refraction correction device for an underwater imaging system according to claim 2, characterized in that: The first-stage light shielding sheet (131) and the second-stage light shielding sheet (132) are respectively provided with four light shielding leaves (133); the first-stage light shielding sheet (131) and the second-stage light shielding sheet (132) are both evenly spaced.

4. The refraction correction device for an underwater imaging system according to claim 2, characterized in that: The first-stage light shielding sheet (131) is arranged in parallel with the lens barrel (100); the second-stage light shielding sheet (132) is arranged on the inner side of the first-stage light shielding sheet (131); and the second-stage light shielding sheet (132) is arranged in a retracted and tilted manner toward the axis center line direction of the lens barrel (100).

5. The refraction correction device for an underwater imaging system according to any one of claims 1 to 4, characterized in that: The lens barrel (100) is provided with a fourth adjustment lens (124) at the junction of the light shielding head (130) and the lens barrel (100).

6. The refraction correction device for an underwater imaging system according to claim 1, characterized in that: The first adjustment lens (121) is a composite lens, consisting of a double convex aspheric lens and a lens with a concave surface; the double convex aspheric lens has one convex surface arranged in the concave surface of the lens with a concave surface; Wherein, the biconvex aspheric lens is a lens with positive optical power; and the lens with a concave surface is a lens with negative optical power.

7. The refraction correction device for an underwater imaging system according to claim 1, characterized in that: The second adjustment lens (122) is a biconvex lens with positive optical power.

8. The refraction correction device for an underwater imaging system according to claim 6, characterized in that: The third adjustment lens (123) is a composite lens, which is composed of a lens with a concave surface and a plano-convex lens with a convex surface; the concave surfaces of the lens with a concave surface in the third adjustment lens (123) and the second adjustment lens (122) are arranged opposite to each other.

9. The refraction correction device for an underwater imaging system according to claim 5, characterized in that: The fourth adjustment lens (124) is a lens made of a material with high refractive index and low scattering rate.

10. The refraction correction device for an underwater imaging system according to claim 9, characterized in that: The material of the fourth adjustment lens (124) is MR TM -8 material, barium titanate material or flint material.

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