A miniature sharp cone opening and closing curtain non-interference imaging device

Abstract

The application discloses a miniature sharp cone type curtain opening and closing curtain non-interference imaging device, and belongs to the technical field of optical imaging. The device comprises a conical shell, a lens assembly, a curtain assembly and an image processing module arranged in the conical shell. The top of the conical shell is provided with a light inlet hole. The lens assembly comprises an aspheric lens group and an image sensor coaxially arranged on the axis of the light inlet hole. The curtain assembly comprises a curtain and a driving part. The two ends of the curtain are respectively marked as a proximal end and a distal end. The proximal end is arranged on one side of the light inlet hole, and the distal end is connected with the driving part. The driving part drives the curtain to move, so that the proximal end opens and closes the light inlet hole. The image processing module is connected with the image sensor, and is used for acquiring image data and performing enhancement processing. The enhancement processing comprises super-resolution reconstruction, detail recovery, brightness compensation and noise suppression. The application can guarantee the comprehensive performance of miniaturization, image quality and anti-detection, and meets the use requirements of different scenes.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a miniature cone-shaped opening and closing curtain-free imaging device. Background Technology

[0002] With the continuous development of intelligent devices and information sensing systems, miniature lenses are increasingly being used in security monitoring, military reconnaissance, medical endoscopy, and smart wearables. Especially in special scenarios such as covert imaging and non-contact monitoring, lenses not only need excellent image acquisition capabilities but also require high structural concealment and optical anti-detection capabilities. However, current technologies still face many bottlenecks in achieving miniaturization, high imaging quality, and multi-dimensional anti-detection.

[0003] In terms of technological implementation, miniature lenses face two major challenges: First, miniaturization and image quality are difficult to achieve simultaneously. Under ultra-small aperture conditions, limited by factors such as reduced light throughput and shortened depth of focus, traditional optical designs struggle to achieve clear images, resulting in prominent issues of image blurring and distortion. Second, anti-detection functions are lacking or inefficient. Existing technologies mostly focus on single protective measures, which are of limited effectiveness against modern high-precision detection methods such as optical radar and infrared lasers.

[0004] While existing technologies, such as the multi-band imaging system promoted by DARPA in the United States, possess a certain degree of concealment, these systems are large and complex, making them unsuitable for portable and flexible deployment scenarios. Although institutions like MIT and Stanford have made progress in computational imaging and super-resolution restoration algorithms, improving the image quality of small-aperture lenses, they have not yet achieved integration with structural concealment and protective devices. Therefore, there is an urgent need for a miniaturized lens that can balance miniaturization, high image quality, and multiple anti-detection measures. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a miniature cone-shaped opening and closing curtain non-disruptive imaging device, which solves the technical problem that the prior art cannot simultaneously achieve miniaturization, imaging quality and anti-detection.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0007] The present invention provides a miniature cone-shaped opening and closing curtain undisturbed imaging device, including a cone-shaped housing and a lens assembly, a curtain assembly and an image processing module disposed inside the cone-shaped housing;

[0008] The top of the conical shell is provided with a light-entry hole;

[0009] The lens assembly includes an aspherical lens group and an image sensor that are coaxially arranged on the axis of the light inlet aperture.

[0010] The curtain assembly includes a curtain and a driving component. The two ends of the curtain are referred to as the near end and the far end, respectively. The near end is located on one side of the light inlet hole, and the far end is connected to the driving component. The driving component drives the curtain to move, so that the near end opens and closes the light inlet hole.

[0011] The image processing module is connected to the image sensor and is used to acquire image data and perform enhancement processing.

[0012] Optionally, the cone angle of the conical shell is 80°±5°, the bottom diameter is 15mm, the length is 20mm, and the diameter of the opening at the top of the conical shell is 0.5mm.

[0013] Optionally, the conical shell is made of titanium alloy.

[0014] Optionally, the aspherical lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged coaxially and sequentially.

[0015] The first lens is a negative lens with an incident surface radius of -79mm, an exit surface radius of 2.223mm, a center thickness of 0.7mm, and a maximum radial dimension of 2mm.

[0016] The second lens is a positive lens with an incident surface radius of 13.69 mm, an exit surface radius of -3.62 mm, a center thickness of 0.89 mm, and a maximum radial dimension of 1.6 mm.

[0017] The third lens is a positive lens with an incident surface radius of -2.57 mm, an exit surface radius of -8.4 mm, a center thickness of 0.8 mm, and a maximum radial dimension of 2 mm.

[0018] The fourth lens is a positive lens with an incident surface radius of -15.43 mm, an exit surface radius of -2.8 mm, a center thickness of 1.7 mm, and a maximum radial dimension of 2.9 mm.

[0019] The fifth lens is a positive lens with an incident surface radius of -7.8 mm, an exit surface radius of -3.44 mm, a center thickness of 2.08 mm, and a maximum radial dimension of 4.56 mm.

[0020] The sixth lens is a positive lens with an incident surface radius of -3.44 mm, an exit surface radius of -14.85 mm, a center thickness of 1.02 mm, and a maximum radial dimension of 4.68 mm.

[0021] Optionally, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of glass with a refractive index of 1.55, and the sixth lens is made of lanthanide glass with a refractive index of 1.85.

[0022] Optionally, the aspherical lens group and the image sensor are integrated using MEMS technology.

[0023] Optionally, the curtain is elongated, and the inner wall of the conical shell is provided with a matching guide groove, within which the curtain moves.

[0024] Optionally, the proximal end is semi-circular.

[0025] Optionally, the curtain is made of nanoscale silver-aluminum alloy, and the surface of the curtain is treated by nanoimprinting combined with chemical vapor deposition technology to form a diffuse reflection layer with multi-scale roughness and irregular texture on the surface of the curtain.

[0026] Optionally, the enhancement process includes super-resolution reconstruction, detail restoration, brightness compensation, and noise suppression.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0028] This invention provides a miniature, cone-shaped, openable and closed curtain-based non-disruptive imaging device. By designing a cone-shaped shell, the device effectively reduces its spatial footprint, achieving miniaturization. Simultaneously, the cone-shaped cut allows light to diverge in different directions, enhancing anti-detection capabilities. The design of an aspherical lens group improves light focusing, ensuring clear and bright images even with an ultra-small aperture. The design of an image processing module addresses the limitations in light transmission caused by the ultra-small aperture, improving image quality. The curtain assembly closes the light inlet, utilizing Fresnel diffraction to avoid forming the imaging device's outline, further enhancing anti-detection capabilities. In summary, this invention exhibits excellent performance in miniaturization, imaging quality, and anti-detection capabilities. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the miniature cone-shaped opening and closing curtain non-interference imaging device provided in the embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the aspherical lens group provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the light-inlet hole for opening and closing the curtain provided in an embodiment of the present invention;

[0032] The diagram is marked as follows:

[0033] 1. Conical housing; 11. Light inlet; 2. Lens assembly; 21. First lens; 22. Second lens; 23. Third lens; 24. Fourth lens; 25. Fifth lens; 26. Sixth lens; 3. Curtain assembly; 31. Curtain; 32. Drive unit; 4. Image processing module. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1:

[0038] like Figure 1As shown, this invention provides a miniature cone-shaped opening and closing curtain-based non-disturbing imaging device, comprising a conical housing 1 and a lens assembly 2, a curtain assembly 3, and an image processing module 4 disposed inside the conical housing 1. The top of the conical housing 1 is provided with a light-entry hole 11; the lens assembly 2 includes an aspherical lens group and an image sensor coaxially arranged on the axis of the light-entry hole 11; the curtain assembly 3 includes a curtain 31 and a driving component 32, with the two ends of the curtain 31 referred to as the near end and the far end, respectively. The near end is disposed on one side of the light-entry hole 11, and the far end is connected to the driving component 32. The driving component 32 drives the curtain 31 to open and close the light-entry hole 11 at the near end; the image processing module 4 is connected to the image sensor and is used to acquire image data and perform enhancement processing; the enhancement processing includes super-resolution reconstruction, detail restoration, brightness compensation, and noise suppression.

[0039] When the curtain 31 is not completely closed, external light enters through the light inlet hole 11, is refracted by the aspherical lens group, and enters the image sensor. The image sensor converts the light signal into an electrical signal (image data) and sends it to the image processing module 4. The image processing module 4 enhances the image data and outputs it.

[0040] Specifically, in this embodiment, the dimensional parameters of the conical shell 1 are as follows: the cone angle is 80°±5°, the bottom diameter is 15mm, the length is 20mm, and the diameter of the opening at the top of the conical shell 1 is 0.5mm.

[0041] First, the conical structure effectively reduces the volume occupied by the imaging device in space, achieving the goal of miniaturization and making it easy to install in various confined spaces. Second, when external detection light shines on the surface of the conical shell 1, the conical structure can scatter the light to a certain extent. Its inclined surface can cause the light to diverge in different directions, reducing the intensity of light reflection in the same direction, thereby reducing the probability of being detected by the detection device. Finally, the conical structure uses the arc-shaped slit imaging principle to guide the light through the slit (light inlet 11) to cover the effective light transmission area of ​​the aspherical lens group. The aspherical lens group can still focus the light onto the image sensor to form a complete image.

[0042] Meanwhile, the conical shell 1 is made of titanium alloy. Titanium alloy is characterized by high strength, low density, and excellent shielding performance, which ensures structural strength, reduces weight, and provides good shielding effect.

[0043] like Figure 2 As shown, in this embodiment, the aspherical lens group includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, and a sixth lens 26 arranged coaxially and sequentially.

[0044] The first lens 21 is a negative lens with an incident surface radius of -79mm (positive and negative indicate the position of the center of the sphere), an exit surface radius of 2.223mm, a center thickness of 0.7mm, and a maximum radial dimension of 2mm.

[0045] The second lens 22 is a positive lens with an incident surface radius of 13.69 mm, an exit surface radius of -3.62 mm, a center thickness of 0.89 mm, and a maximum radial dimension of 1.6 mm.

[0046] The third lens 23 is a positive lens with an incident surface radius of -2.57 mm, an exit surface radius of -8.4 mm, a center thickness of 0.8 mm, and a maximum radial dimension of 2 mm.

[0047] The fourth lens 24 is a positive lens with an incident surface radius of -15.43 mm, an exit surface radius of -2.8 mm, a center thickness of 1.7 mm, and a maximum radial dimension of 2.9 mm.

[0048] The fifth lens 25 is a positive lens with an incident surface radius of -7.8 mm, an exit surface radius of -3.44 mm, a center thickness of 2.08 mm, and a maximum radial dimension of 4.56 mm.

[0049] The sixth lens 26 is a positive lens with an incident surface radius of -3.44 mm, an exit surface radius of -14.85 mm, a center thickness of 1.02 mm, and a maximum radial dimension of 4.68 mm.

[0050] The first lens 21, the second lens 22, the third lens 23, the fourth lens 24, and the fifth lens 25 are made of glass with a refractive index of 1.55, while the sixth lens 26 is made of lanthanide glass with a refractive index of 1.85.

[0051] The distance between the exit surface of the first lens 21 and the incident surface of the second lens 22 is 1.03 mm, the distance between the exit surface of the second lens 22 and the incident surface of the third lens 23 is 0.17 mm, the distance between the exit surface of the third lens 23 and the incident surface of the fourth lens 24 is 0.1 mm, the distance between the exit surface of the fourth lens 24 and the incident surface of the fifth lens 25 is 0.1 mm, the distance between the exit surface of the fifth lens 25 and the incident surface of the sixth lens 26 is 0 mm, and the distance from the exit surface of the sixth lens 26 to the image sensor is 5.12 mm.

[0052] Total optical path length: lens thickness + surface spacing:

[0053] 0.7+1.03+0.89+0.17+0.8+0.1+1.7+0.1+2.08+0+1.02+5.12≈13.71mm (ultra-micro structure), aperture: 0.5mm (design value), aperture value f / 6 (f / number = 3 / 0.5).

[0054] 1080P imaging requires the system to ensure a pixel blur diameter of <2.5μm across the entire field of view on a 1920×1080 pixel image sensor (pixel size ≈ 2.5μm). The core challenge of a 0.5mm aperture is aberration control and light transmission matching within an ultra-miniature structure. The system overcomes these limitations through the following design:

[0055] 1. Precise aberration compression of aspherical lens groups.

[0056] Spherical aberration correction: The first lens 21 has a half-aperture of 1mm (diameter of 2.0mm), which means that it has stricter constraints on edge light rays and requires precise compensation through aspherical surface shape.

[0057] Advanced aberration cancellation: The negative optical power of the front group of the first lens 21 is concentrated, forming a more precise "positive and negative cancellation" with the positive optical power of the second, third and fourth lenses in the rear group.

[0058] 2. Miniaturization and light-concentrating enhancement of lanthanide glass lens F.

[0059] High refractive index adapts to ultra-small front group: The sixth lens 26 uses lanthanide glass (refractive index 1.85), which is much higher than the 1.55 of the first to fifth lenses. Under the same focal length, its surface curvature can be further reduced, perfectly adapting to the ultra-small size of the first lens 21, so that the total diameter of the system is controlled within 4.68mm (key to ultra-miniaturization).

[0060] Low dispersion optimizes chromatic aberration: Lanthanide glass has low dispersion. The sixth lens 26, as the last imaging lens, can compress the red and blue light focusing deviation from 2.2μm in ordinary glass (n=1.55) to 0.6μm (<1 pixel size), avoiding "color fringing" in 1080P images. This is especially important for the compact optical path caused by the ultra-small front group (first lens 21), because a compact optical path easily amplifies chromatic aberration.

[0061] 3. Optical power distribution and "low sensitivity" design.

[0062] Balance of optical power density between front and rear groups: Through optimized allocation, the optical power ratio between the first lens 21 in the front group and the rear group is 1:3.5, and the incident angle of each lens is controlled within 8°, ensuring the structural stability under the 0.5mm small aperture + ultra-small front group.

[0063] Field curvature and off-axis image quality assurance: The focusing plane deviation (field curvature) between the axis and off-axis fields of view is reduced from 45μm to 10μm, ensuring consistent sharpness between the four corner pixels and the center pixel in 1080P.

[0064] 4. "Precise matching" for insufficient light transmission.

[0065] High transmittance design: The aspherical lenses (first to fourth) are coated with a multi-layer anti-reflection film (transmittance >99% / surface), and the first lens with a 21 half-aperture can completely cover the incident light; combined with the low absorption characteristics of lanthanide glass (F), the total transmittance of the system reaches 94%, collecting 15% more light than lenses of the same size.

[0066] High-sensitivity image sensor collaboration: The 2-megapixel CMOS uses back-illuminated technology, and in low light with a 0.5mm aperture, each pixel can collect 1400 photoelectrons (far exceeding the noise threshold of 300). Combined with the lens's f / 6 aperture (medium light transmission), it ultimately achieves clear and bright 1080P images.

[0067] 5. Temperature stability of the all-glass design.

[0068] All-glass lenses (lenses one through six are all made of glass) have a low coefficient of thermal expansion (7×10). -6 / ℃), with the first lens 21 having a tiny size of 1mm half-aperture, the size change caused by high and low temperatures (-40℃~85℃) is only 0.0007mm, and the optical path offset is <0.1μm, ensuring that the image point position is stable within the pixel range.

[0069] The aspherical lens group achieves 1080P high-definition imaging with an ultra-miniature aperture of 0.5mm through "precise compression of aspherical aberrations + miniaturization and focusing (F) of lanthanide glass + balanced distribution of optical power density + collaboration with a high-sensitivity sensor": aspherical surfaces ensure aberrations <1μm, high-refractive-index materials are adapted to the ultra-small front group and the structure is reduced, optical power distribution reduces system sensitivity, light transmission is met by high transmittance in conjunction with the sensor, and the all-glass design ensures stable imaging in extreme environments. The reduction of the 21 half-aperture of the first lens, through overall parameter synergistic optimization, actually enhances the ultra-miniature characteristics and image quality control of the system.

[0070] Specifically, in this embodiment, the aspherical lens group and image sensor are integrated using MEMS technology. By applying microelectromechanical systems (MEMS) technology, some traditional mechanical components are miniaturized to better meet the requirements of ultra-small apertures, providing a reliable guarantee for the stable operation of the lens within the device.

[0071] Specifically, in this embodiment, the curtain 31 is elongated, and a matching guide groove is provided on the inner wall of the conical housing 1, within which the curtain 31 moves. The curtain 31 is made of nano-grade silver-aluminum alloy, with a thickness controlled at 50μm. This ensures both light-blocking capability and avoids interference from the internal structure of the conical housing due to its extremely thin and light-reducing characteristics. The width is controlled within 1.2mm, while being 0.5mm larger than the aperture of the light inlet 11. On the one hand, this width is sufficient to cover the effective light-passing area of ​​the lens, ensuring that the intended effect is achieved when blocking light; on the other hand, it will not obstruct light from passing through the light inlet 11 due to excessive width, fundamentally avoiding interference with imaging and achieving the effect of "blocking without blocking light".

[0072] The curtain 31, acting as the aperture stop of the light entrance 11, does not affect the imaging range. The essential function of the aperture stop is to control the aperture angle of the incident light beam, thereby affecting the amount of light transmitted and the depth of field, but it does not determine whether an image is formed. For example, in a traditional camera, the aperture (aperture stop) is located inside the lens. If it is placed externally and off-center, it will cause: vignetting: the edges of the image become darker; aberration changes: the off-center aperture stop may introduce coma and other off-axis aberrations; but the outline of the subject can still be imaged.

[0073] Meanwhile, the near end is semi-circular, which can effectively reduce the possibility of irregular reflection and scattering of light at the edge, indirectly ensuring image quality.

[0074] Depending on the requirements, the drive component 32 can be a linear motor, with an effective stroke controlled within 0-2mm to achieve precise drive. For example... Figure 3 As shown, the precise short-distance drive allows the curtain 31 to switch from "opening" to "blocking" within an extremely narrow range. This positioning not only clearly defines the boundary of the blockage but also opens a channel for imaging light through the reserved gaps, achieving a seamless connection between "on-demand blocking" and "stable imaging".

[0075] To further enhance anti-detection performance, after fabrication, the surface of the curtain 31 is treated using a combination of nanoimprinting and chemical vapor deposition techniques to form a diffuse reflection layer with multi-scale roughness and irregular texture. This diffuse reflection layer effectively disperses incident light in the visible and near-infrared bands, producing multi-angle irregular diffuse reflection. Combined with Fresnel diffraction and phase disturbance mechanisms, this significantly weakens the optical imaging characteristics at the lens boundary, preventing detection by traditional optical detection equipment and achieving highly efficient anti-detection capabilities.

[0076] During the imaging process, the limited light transmission due to the ultra-small aperture often results in insufficient brightness, loss of detail, and increased noise in the image. To address this, this embodiment utilizes image processing module 4 to perform super-resolution reconstruction, detail restoration, brightness compensation, and noise suppression on the images acquired by the image sensor, providing real-time enhancement to significantly improve image quality. The specific implementation method is as follows:

[0077] (1) Image super-resolution reconstruction module, which is based on lightweight residual deep convolutional neural network (Fast-SRGAN) to restore low-resolution images to high-resolution images, thereby improving the clarity and detail of the images.

[0078] (2) Detail restoration and brightness compensation module: In order to restore texture details in the blurred imaging area, the convolutional attention mechanism (CBAM) is used to weight the feature channels, and based on the Retinex theory (Single-Scale Retinex, SSR), the image brightness is nonlinearly enhanced by estimating the reflection and illumination components.

[0079] (3) Noise suppression module: Due to the low signal-to-noise ratio of imaging under ultra-micro aperture conditions, an adaptive noise reduction network (DnCNN) needs to be introduced. The noise distribution is predicted by residual learning and then removed from the original image to achieve fine noise reduction processing of the image, thereby effectively improving the image clarity and stability without damaging the edges and details.

[0080] In summary, the embodiments of the present invention employ a conical structure and MEMS technology for integrated design in terms of miniaturization, miniaturizing some traditional mechanical components to better meet the requirements of ultra-micro apertures, thus providing a reliable guarantee for the stable operation of the lens within the device.

[0081] In terms of imaging, an aspherical lens group and image sensor are used to achieve "precise compression of aspherical aberrations + miniaturization and focusing (F) of lanthanide glass + balanced distribution of optical power density + high-sensitivity sensor collaboration," enabling 1080P high-definition imaging with an ultra-micro aperture of 0.5mm. An image processing module 4 is designed to address the limitations in light transmission caused by the ultra-micro aperture, thus improving image quality.

[0082] In terms of anti-detection, it features multiple anti-detection mechanisms. It reduces visual signature through a conical structure, a low-reflectivity outer shell, and a scattering curtain 31, achieving anti-visual detection. It utilizes the diffraction and scattering characteristics of the curtain 31 to interfere with optical instruments' recognition of the lens, achieving anti-optical detection. It employs a lens-exterior shielding design to block the PN junction detection path, achieving anti-PN junction detection. The outer shell surface undergoes a low-reflectivity treatment, using a special coating material to reduce light reflectivity, further enhancing the anti-visual detection effect.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A miniature cone-shaped opening and closing curtain-based non-disruptive imaging device, characterized in that, It includes a conical housing and a lens assembly, a curtain assembly, and an image processing module disposed inside the conical housing; The top of the conical shell is provided with a light-entry hole; The lens assembly includes an aspherical lens group and an image sensor coaxially arranged on the axis of the light-entry aperture; the aspherical lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged coaxially and in sequence. The first lens is a negative lens with an incident surface radius of -79mm, an exit surface radius of 2.223mm, a center thickness of 0.7mm, and a maximum radial dimension of 2mm. The second lens is a positive lens with an incident surface radius of 13.69 mm, an exit surface radius of -3.62 mm, a center thickness of 0.89 mm, and a maximum radial dimension of 1.6 mm. The third lens is a positive lens with an incident surface radius of -2.57 mm, an exit surface radius of -8.4 mm, a center thickness of 0.8 mm, and a maximum radial dimension of 2 mm. The fourth lens is a positive lens with an incident surface radius of -15.43 mm, an exit surface radius of -2.8 mm, a center thickness of 1.7 mm, and a maximum radial dimension of 2.9 mm. The fifth lens is a positive lens with an incident surface radius of -7.8 mm, an exit surface radius of -3.44 mm, a center thickness of 2.08 mm, and a maximum radial dimension of 4.56 mm. The sixth lens is a positive lens with an incident surface radius of -3.44 mm, an exit surface radius of -14.85 mm, a center thickness of 1.02 mm, and a maximum radial dimension of 4.68 mm. The curtain assembly includes a curtain and a driving component. The two ends of the curtain are referred to as the near end and the far end, respectively. The near end is located on one side of the light-inlet hole, and the far end is connected to the driving component. The driving component drives the curtain to move, causing the near end to open and close the light-inlet hole. The surface of the curtain is treated by nanoimprinting combined with chemical vapor deposition technology to form a diffuse reflection layer with multi-scale roughness and irregular texture on the surface of the curtain. The image processing module is connected to the image sensor and is used to acquire image data and perform enhancement processing.

2. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The conical shell has a cone angle of 80°±5°, a bottom diameter of 15mm, a length of 20mm, and a hole diameter of 0.5mm at the top of the conical shell.

3. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The conical shell is made of titanium alloy.

4. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of glass with a refractive index of 1.55, and the sixth lens is made of lanthanide glass with a refractive index of 1.

85.

5. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The aspherical lens group and the image sensor are integrated using MEMS technology.

6. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The curtain is elongated, and the inner wall of the conical shell is provided with a matching guide groove, within which the curtain moves.

7. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The proximal end is semi-circular.

8. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The curtain is made of nano-grade silver aluminum alloy.

9. The miniature cone-shaped opening and closing curtain undisturbed imaging device according to claim 1, characterized in that, The enhancement process includes super-resolution reconstruction, detail restoration, brightness compensation, and noise suppression.

Images