Underwater ultra-wide-angle imaging optical lens and device

Abstract

The invention relates to the technical field of optical imaging, and particularly provides an underwater ultra-wide-angle imaging optical lens and equipment, the underwater ultra-wide-angle imaging optical lens and equipment are suitable for a liquid medium with the refractive index of 1.3-1.4 and are especially designed for an underwater high-pressure environment, the lens sequentially comprises protective glass, a front lens group with positive focal power and a rear lens group with positive focal power in the light incidence direction, wherein the front lens group is composed of six lenses including a single lens and a glued lens, the rear lens group is composed of four lenses including a single lens and a glued lens, aberration correction is achieved by optimizing focal power distribution and glued structures of all the lenses, and the underwater field angle reaches 140 degrees or above within the waveband range of 450-700 nm. The system solves the problems of limited view field, low contrast ratio and the like caused by total reflection in underwater imaging, has the characteristics of miniaturization, wide view field and high resolution, and is suitable for scenes requiring deep underwater monitoring and monitoring. In addition, the optical system is a full-spherical-surface optical system and does not comprise an aspheric surface, and the economic benefits are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to an underwater ultra-wide-angle imaging optical lens and equipment. Background Art

[0002] Compared with optical imaging systems in the air, underwater optical imaging systems are more complex. The absorption and scattering effects of the liquid medium itself and the impurities suspended inside the liquid medium will have a negative impact on imaging, such as the reduction of energy reaching the detector, loss of image contrast, and reduction of resolution.

[0003] In addition, there is an important problem that when light propagates from a dense medium to a sparse medium, total reflection will occur. Therefore, when the imaging system is placed in a liquid medium, its maximum field of view will be limited. Therefore, the field of view of underwater optical systems currently on the market is small to medium. Summary of the invention

[0004] In view of this, the present invention aims to provide an underwater ultra-wide-angle imaging optical system with an ultra-large field of view, a large relative aperture, and a miniaturized and portable structure, which solves the problem of limited field of view of existing underwater optical equipment.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows: The invention provides an underwater ultra-wide-angle imaging optical lens, comprising: a front lens group with positive optical power and a rear lens group with positive optical power; The front lens group includes: a first lens with negative optical power, a second lens with negative optical power, a first cemented lens with positive optical power, and a second cemented lens with positive optical power, which are sequentially arranged along the incident direction; The rear lens group comprises: a seventh lens with positive focal power, a third cemented lens with negative focal power, and a tenth lens with positive focal power, which are arranged in sequence along the incident direction.

[0006] Preferably, the first cemented lens includes: a third lens with positive focal power and a fourth lens with negative focal power, which are arranged in sequence along the incident direction.

[0007] Preferably, the second cemented lens includes: a fifth lens with positive focal power and a sixth lens with negative focal power, which are arranged in sequence along the incident direction.

[0008] Preferably, the third cemented lens includes: an eighth lens with negative optical power and a ninth lens with positive optical power, which are arranged in sequence along the incident direction.

[0009] Preferably, a protective glass is also provided at the front end of the front lens group.

[0010] Preferably, the operating band of the underwater ultra-wide-angle imaging optical lens is 450nm~700nm, and the field of view angle is not less than 140° in a medium with a refractive index of 1.3~1.4.

[0011] Preferably, the focal length relationship between the front lens group and the rear lens group satisfies: ; ; in, It represents the focal length of the underwater ultra-wide-angle imaging optical lens in the air. represents the focal length of the front lens group, Indicates the focal length of the rear lens group.

[0012] Preferably, the focal length relationship between the first glued lens, the second glued lens and the third glued lens satisfies: ; ; ; ; ; ; in, represents the focal length of the first composite lens, represents the focal length of the second composite lens, represents the focal length of the first cemented lens, represents the focal length of the third lens, represents the focal length of the fourth lens, represents the focal length of the fifth lens, represents the focal length of the sixth lens, represents the focal length of the eighth lens, Indicates the focal length of the ninth lens.

[0013] Preferably, the material refractive index of the first lens is 1.55-1.75, and the radius of curvature of the front surface is 9.7 mm-22.5 mm, and the radius of curvature of the rear surface is 1.7 mm-3.5 mm; The material refractive index of the second lens is 1.55 to 1.75, the radius of curvature of the front surface is -45 mm to -66 mm, and the radius of curvature of the rear surface is 1.55 mm to 3.5 mm; The material refractive index of the third lens is 1.55~1.75, the radius of curvature of the front surface is 8.2mm~20mm, and the radius of curvature of the rear surface is -1.1mm~-5mm; The material refractive index of the fourth lens is 1.45 to 1.60, the radius of curvature of the front surface is -1.1 mm to -5 mm, and the radius of curvature of the rear surface is -7.2 mm to -12 mm; The material refractive index of the fifth lens is 1.45 to 1.60, the radius of curvature of the front surface is 9.8 mm to 19.8 mm, and the radius of curvature of the rear surface is -1.1 mm to -6.1 mm; The refractive index of the material of the sixth lens is 1.77 to 1.90, the radius of curvature of the front surface is -1.1 mm to -6.1 mm, and the radius of curvature of the rear surface is -1.1 mm to -7.3 mm; The refractive index of the material of the seventh lens is 1.45-1.55, the curvature radius of the front surface is 3.3 mm-13.3 mm, and the curvature radius of the rear surface is -8.4 mm--21.7 mm; The material refractive index of the eighth lens is 1.77 to 1.90, the radius of curvature of the front surface is -1.7 mm to -17.3 mm, and the radius of curvature of the rear surface is 2.1 mm to 22.7 mm; The refractive index of the material of the ninth lens is 1.50-1.55, the radius of curvature of the front surface is 0.7 mm-30.3 mm, and the radius of curvature of the rear surface is -1.9 mm--18.1 mm; The material refractive index of the tenth lens is 1.45-1.60, the curvature radius of the front surface is 1.5 mm-28.7 mm, and the curvature radius of the rear surface is -6.9 mm--41.9 mm.

[0014] Preferably, the lenses in the front lens group and the rear lens group are all spherical optical lenses.

[0015] Another aspect of the present invention provides an underwater ultra-wide-angle imaging device, including an underwater ultra-wide-angle imaging optical lens.

[0016] Compared with the prior art, the invention can achieve the following beneficial effects: The present invention designs an underwater imaging optical lens and device with an ultra-large field of view, a large relative aperture, and a miniaturized and portable design. By rationally optimizing the distribution of the optical power of each lens, the optical power distributed to each lens can achieve a good aberration optimization effect, thereby solving the problem of the limited maximum field of view of the optical system in the existing design. When imaging in a liquid medium with a refractive index of 1.3-1.4, the optical lens has an underwater field of view of more than 140° and an operating band of 450nm-700nm, thereby making up for the lack of underwater imaging optical lenses and devices with a large field of view on the market.

[0017] In addition, the optical lens of the present invention has the advantages of small size, light weight, and easy portability. Its relative aperture is no greater than F / 3.5, its outer diameter is no greater than Φ25, and its overall length is no greater than 30 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 is an optical structure diagram of an underwater ultra-wide-angle imaging optical lens provided according to an embodiment of the present invention; Figure 2 is a point diagram of an underwater ultra-wide-angle imaging optical lens provided according to an embodiment of the present invention; Figure 3 is a graph of MTF (modulation transfer function) @200lp / mm of an underwater ultra-wide-angle imaging optical lens provided according to an embodiment of the present invention; Figure 4 4 is a distortion curve diagram of an underwater ultra-wide-angle imaging optical lens provided according to an embodiment of the present invention.

[0019] Reference numerals include: Protective glass 0, first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7, eighth lens 8, ninth lens 9, tenth lens 10, aperture 11, image plane 12. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and do not constitute a limitation to the invention. Similar components in different embodiments use associated similar component numbers. In the following embodiments, many detailed descriptions are to enable the invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other components, materials, and methods. In some cases, some operations related to the invention are not shown or described in the specification, in order to avoid the core part of the invention being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0022] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0023] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] See also Figure 1In one embodiment of the present invention, an underwater ultra-wide-angle imaging optical lens is provided, comprising a protective glass 0, a front lens group with positive focal length, and a rear lens group with positive focal length, which are sequentially arranged along the incident direction of light, wherein the protective glass 0 is used to protect the rear optical system. Since the lens designed in the embodiment of the present invention is mainly used underwater, usually at a depth of 2 km underwater, special requirements are put forward for the protective glass 0 in order to resist underwater pressure. The protective glass 0 is made of sapphire crystal optical glass material, which is a material with very high hardness, excellent optical properties and wear resistance, and is very suitable for optical systems in harsh environments such as underwater. The shape of the protective glass 0 is a spherical equal-thickness window glass, and its light aperture is required to be no more than Ф25mm, so as to control the overall size and weight of the optical lens. The thickness of the protective glass 0 should be no less than 7mm, and the sufficient thickness can resist water pressure to ensure the stability and reliability of the optical system.

[0026] The front lens group includes 6 spherical lenses, specifically including: a first lens 1 with negative optical power, a second lens 2 with negative optical power, a first cemented lens with positive optical power, and a second cemented lens with positive optical power, which are arranged in sequence along the incident direction. Among them, the first cemented lens includes: a third lens 3 with positive optical power and a fourth lens 4 with negative optical power, which are arranged in sequence along the incident direction. The second cemented lens includes: a fifth lens 5 with positive optical power and a sixth lens 6 with negative optical power, which are arranged in sequence along the incident direction.

[0027] The rear lens group includes four spherical lenses, specifically including: a seventh lens 7 with positive focal power, a third cemented lens with negative focal power, and a tenth lens 10 with positive focal power, which are arranged in sequence along the incident direction. Among them, the third cemented lens includes: an eighth lens 8 with negative focal power and a ninth lens 9 with positive focal power, which are arranged in sequence along the incident direction.

[0028] A diaphragm 11 is also provided between the front lens group and the rear lens group, which limits the diameter of the light beam passing through the optical lens and controls the field of view of the final imaging, so that the underwater light is focused on the image plane 12 after passing through the front lens group and the rear lens group. The design of the diaphragm 11 helps to reduce aberrations in the optical system and improve the quality and clarity of imaging.

[0029] In addition, all lenses in the embodiment of the present invention are spherical lenses, which are easy to process and have high processing accuracy, and can effectively reduce the production cost. The lens in the embodiment of the present invention is a spherical optical system, which does not include an aspherical surface, and effectively improves the economic benefits.

[0030] The focal length relationship between the front lens group and the rear lens group should meet the following conditions: ; .

[0031] in, It represents the focal length of the underwater ultra-wide-angle imaging optical lens in the air. represents the focal length of the front lens group, Indicates the focal length of the rear lens group.

[0032] The design of the cemented lenses in the front lens group and the rear lens group helps to correct chromatic aberration in the system. The focal length relationship of each lens in the first cemented lens, the second cemented lens and the third cemented lens should meet the following conditions: ; ; ; ; ; .

[0033] in, represents the focal length of the first composite lens, represents the focal length of the second composite lens, represents the focal length of the first cemented lens, represents the focal length of the third lens 3, represents the focal length of the fourth lens 4, represents the focal length of the fifth lens 5, represents the focal length of the sixth lens 6, represents the focal length of the eighth lens 8, represents the focal length of the ninth lens 9.

[0034] In addition, in order to take into account the portability of underwater ultra-wide-angle imaging optical lenses and optical equipment manufactured using them, the relative aperture of the optical lens is required to be no greater than F / 3.5, the overall outer diameter is no greater than Ф25, the overall length is no greater than 30mm, and within the working band of 450nm~700nm, it can form images in water with a refractive index of 1.3~1.4, and the underwater field of view angle is no less than 140°.

[0035] Based on the above design requirements, the embodiment of the present invention specifically designs the surface parameters of each lens and allocates appropriate optical power to different lenses, so that the optical power allocated to each lens can achieve a good aberration optimization effect. The specific parameters are as follows: The first lens 1 has negative optical power, and the curvature radius of the front surface is 9.7mm~22.5mm, the curvature radius of the rear surface is 1.7mm~3.5mm, the surface shape is a convex-concave spherical lens, the refractive index of the material used for its preparation is 1.55~1.75, and the thickness is 1.1mm~2.3mm. And it is required that its effective aperture is not greater than Ф8.5mm.

[0036] The second lens 2 has negative focal power, and the radius of curvature of the front surface is -45mm~-66mm, the radius of curvature of the rear surface is 1.55mm~3.5mm, the surface shape is a double concave spherical lens, the refractive index of the material used for its preparation is 1.55~1.75, and the thickness is 1.0mm~2.6mm. And its effective aperture is required to be no greater than Ф4mm.

[0037] The third lens 3 has positive power, and the radius of curvature of the front surface is 8.2mm~20mm, the radius of curvature of the rear surface is -1.1mm~-5mm, the surface shape is a double convex spherical lens, the refractive index of the manufacturing material is 1.55~1.75, and the thickness is 0.8mm~1.6mm.

[0038] The fourth lens 4 has negative optical power, and the curvature radius of the front surface is -1.1mm~-5mm, the curvature radius of the rear surface is -7.2mm~-12mm, the surface shape is a concave-convex spherical lens, and the refractive index of the manufacturing material thereof is 1.45~1.60, and the thickness is 0.8mm~1.4mm.

[0039] The fifth lens 5 has positive power, and the curvature radius of the front surface is 9.8 mm to 19.8 mm, the curvature radius of the rear surface is -1.1 mm to -6.1 mm, the surface shape is a biconvex spherical lens, and the refractive index of the manufacturing material thereof is 1.45 to 1.60.

[0040] The sixth lens 6 has negative power, and the curvature radius of the front surface is -1.1 mm to -6.1 mm, the curvature radius of the rear surface is -1.1 mm to -7.3 mm, the surface shape is a concave-convex spherical lens, and the refractive index of the manufacturing material thereof is 1.77 to 1.90.

[0041] The seventh lens 7 has positive power, and the curvature radius of the front surface is 3.3 mm to 13.3 mm, the curvature radius of the rear surface is -8.4 mm to -21.7 mm, the surface shape is a biconvex spherical lens, and the refractive index of the manufacturing material thereof is 1.45 to 1.55.

[0042] The eighth lens 8 has negative power, and the radius of curvature of the front surface is -1.7 mm to -17.3 mm, the radius of curvature of the rear surface is 2.1 mm to 22.7 mm, the surface shape is a biconcave spherical lens, and the refractive index of the material used for preparing the eighth lens 8 is 1.77 to 1.90.

[0043] The ninth lens 9 has positive power, and the curvature radius of the front surface is 0.7 mm to 30.3 mm, the curvature radius of the rear surface is -1.9 mm to -18.1 mm, the surface shape is a biconvex spherical lens, and the refractive index of the manufacturing material thereof is 1.50 to 1.55.

[0044] The tenth lens 10 has positive power, and the radius of curvature of the front surface is 1.5 mm to 28.7 mm, the radius of curvature of the rear surface is -6.9 mm to -41.9 mm, the surface shape is a biconvex spherical lens, and the refractive index of the material used for preparing the tenth lens 10 is 1.45 to 1.60.

[0045] Based on the above parameters, the underwater ultra-wide-angle imaging optical lens proposed in the embodiment of the present invention is also simulated and verified. In order to evaluate the performance of the optical lens, the key test results are as follows: Figure 2 , Figure 3 and Figure 4 The point diagram, MTF curve and distortion curve of the optical lens are shown.

[0046] From the point diagram, we can see that the light has a good convergence effect after passing through the lens. The spot size and shape at different field of view positions and different defocus amounts are all good, indicating that the lens has high imaging quality and can produce clear images.

[0047] From the MTF curve, it can be seen that the lens's ability to transmit contrast at different spatial frequencies meets the design requirements, the imaging performance at different spatial frequencies is close to the limit performance, and the ability to transmit image detail information is excellent.

[0048] From the distortion curve, it can be seen that the degree of distortion of the lens at different field of view positions meets the design requirements for use, and it has the ability to produce clear images in a field of view of more than 140°.

[0049] The underwater ultra-wide-angle imaging optical lens proposed in the embodiment of the present invention can be adapted to existing underwater ultra-wide-angle imaging equipment, solving the problem that the field of view of underwater optical systems on the market are all small or medium, thus filling the gap in underwater ultra-wide-angle imaging equipment and having high practical application value.

[0050] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0051] The systems, devices, modules or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0052] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0053] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0054] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. An underwater ultra-wide-angle imaging optical lens, characterized in that: include: A front lens group with positive power and a rear lens group with positive power; The front lens group includes: a first lens with negative optical power, a second lens with negative optical power, a first cemented lens with positive optical power, and a second cemented lens with positive optical power, which are sequentially arranged along the incident direction; The rear lens group includes: a seventh lens with positive focal power, a third cemented lens with negative focal power, and a tenth lens with positive focal power, which are arranged in sequence along the incident direction.

2. The underwater ultra-wide-angle imaging optical lens according to claim 1, characterized in that: The first cemented lens comprises: a third lens with positive focal power and a fourth lens with negative focal power, which are arranged in sequence along the incident direction.

3. The underwater ultra-wide-angle imaging optical lens according to claim 2, characterized in that: The second cemented lens comprises: a fifth lens with positive focal power and a sixth lens with negative focal power, which are arranged in sequence along the incident direction.

4. The underwater ultra-wide-angle imaging optical lens according to claim 3, characterized in that: The third cemented lens comprises an eighth lens with negative focal power and a ninth lens with positive focal power which are sequentially arranged along the incident direction.

5. The underwater ultra-wide-angle imaging optical lens according to claim 1, characterized in that: A protective glass is also provided at the front end of the front lens group.

6. The underwater ultra-wide-angle imaging optical lens according to claim 1, characterized in that: The working band of the underwater ultra-wide-angle imaging optical lens is 450nm~700nm, and the field angle is not less than 140° in a medium with a refractive index of 1.3~1.

4.

7. The underwater ultra-wide-angle imaging optical lens according to claim 1, characterized in that: The focal length relationship between the front lens group and the rear lens group satisfies: ； ； in, represents the focal length of the underwater ultra-wide-angle imaging optical lens in air, represents the focal length of the front lens group, Represents the focal length of the rear lens group.

8. The underwater ultra-wide-angle imaging optical lens according to claim 4, characterized in that: The focal length relationship between the first glued lens, the second glued lens and the third glued lens satisfies: ； ； ； ； ； ； in, represents the focal length of the first composite lens, represents the focal length of the second cemented lens, represents the focal length of the first cemented lens, represents the focal length of the third lens, represents the focal length of the fourth lens, represents the focal length of the fifth lens, represents the focal length of the sixth lens, represents the focal length of the eighth lens, represents the focal length of the ninth lens.

9. The underwater ultra-wide-angle imaging optical lens according to claim 4, characterized in that: The material refractive index of the first lens is 1.55-1.75, the radius of curvature of the front surface is 9.7mm-22.5mm, and the radius of curvature of the rear surface is 1.7mm-3.5mm; The refractive index of the material of the second lens is 1.55 to 1.75, the radius of curvature of the front surface is -45 mm to -66 mm, and the radius of curvature of the rear surface is 1.55 mm to 3.5 mm; The material refractive index of the third lens is 1.55-1.75, the radius of curvature of the front surface is 8.2mm-20mm, and the radius of curvature of the rear surface is -1.1mm--5mm; The material refractive index of the fourth lens is 1.45-1.60, the radius of curvature of the front surface is -1.1mm--5mm, and the radius of curvature of the rear surface is -7.2mm--12mm; The material refractive index of the fifth lens is 1.45-1.60, the radius of curvature of the front surface is 9.8mm-19.8mm, and the radius of curvature of the rear surface is -1.1mm--6.1mm; The material refractive index of the sixth lens is 1.77 to 1.90, the radius of curvature of the front surface is -1.1 mm to -6.1 mm, and the radius of curvature of the rear surface is -1.1 mm to -7.3 mm; The material refractive index of the seventh lens is 1.45-1.55, the radius of curvature of the front surface is 3.3mm-13.3mm, and the radius of curvature of the rear surface is -8.4mm--21.7mm; The material refractive index of the eighth lens is 1.77-1.90, the radius of curvature of the front surface is -1.7mm--17.3mm, and the radius of curvature of the rear surface is 2.1mm-22.7mm; The refractive index of the material of the ninth lens is 1.50-1.55, the radius of curvature of the front surface is 0.7 mm-30.3 mm, and the radius of curvature of the rear surface is -1.9 mm--18.1 mm; The material refractive index of the tenth lens is 1.45-1.60, the curvature radius of the front surface is 1.5mm-28.7mm, and the curvature radius of the rear surface is -6.9mm--41.9mm.

10. The underwater ultra-wide-angle imaging optical lens according to claim 1, characterized in that: The lenses in the front lens group and the rear lens group are all spherical optical lenses.

11. An underwater ultra-wide-angle imaging device, characterized in that: An underwater ultra-wide-angle imaging optical lens comprising any one of claims 1 to 10.

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