Low-light night vision device

Abstract

The invention provides a low-light night vision device, which comprises a first monocular lens group, and the first monocular lens group comprises a housing which comprises a front cover plate and a lens barrel, and the front cover plate is installed at a front end opening of the lens barrel; the low-light objective lens group is mounted on the front cover plate; the image intensifier support is arranged at the rear end of the low-light objective lens group along the low-light optical axis and comprises an installation cylinder, an adjusting screw ring and an elastic piece, the installation cylinder is used for installing an image intensifier, the front end of the image intensifier support abuts against the front cover plate, and the rear end of the image intensifier support abuts against the rear end of the installation cylinder through the elastic piece; the eyepiece group is arranged at the rear end along the low-light optical axis; wherein the adjusting screw ring is respectively connected with the front cover plate and the mounting cylinder through reverse threads, so that when the adjusting screw ring is rotated, the mounting cylinder and the front cover plate move towards each other or away from each other along the direction of a low-light optical axis. According to the low-light level night vision device, the image intensifier is detachably connected with the front cover plate through the image intensifier support, the image intensifier can be installed, replaced and adjusted through the image intensifier support, and the low-light level night vision device can adapt to different image intensifiers.

Description

Low-light-level night vision device Technical Field

[0001] The present application relates to the technical field of night vision devices, and in particular to a low-light-level night vision device. Background Art

[0002] The low-light-level night vision system uses an image intensifier as its core component, amplifying faint moonlight, starlight, atmospheric glow, and other reflections from the target scene to produce a bright scene image observable to the human eye. A low-light-level image intensifier is a photoelectric device consisting of an intensifier tube and a high-voltage power supply encapsulated through a potting process. The imaging principle is that the photocathode converts the optical image into an electronic image. The electron-optical imaging system (electrode system) transmits the electronic image to a fluorescent screen, enhancing the electron energy and scaling the geometric dimensions of the electronic image during the transmission process. The fluorescent screen then completes the electro-optical conversion, converting the electronic image into a visible light image. Its advantages lie in its continuous photoelectric imaging surface, high resolution, clear imaging, and visual capabilities close to those of the human eye. Based on the stage of development, it can be divided into: first generation, second generation, third generation, and second and a half generation.

[0003] Due to the varying levels of development of low-light-level night vision technology in different regions, the price of the same low-light-level image intensifier can vary significantly. Users in technologically advanced regions often require separate purchases of the night vision device housing and the low-light-level image intensifier. Therefore, head-mounted night vision devices developed for fixed-model image intensifiers cannot meet these needs. Furthermore, since low-light-level image intensifiers are susceptible to damage from strong light during actual use, a key requirement for night vision device users is the availability of readily available local image intensifier resources for product maintenance. Technical issues

[0004] In order to solve the existing technical problems, the present application provides a low-light-level night vision device that can be adapted to different image intensifiers, making it convenient for users to assemble and replace them. Technical Solutions

[0005] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The present embodiment provides a low-light-level night vision device, including a first monocular lens assembly, wherein the first monocular lens assembly includes:

[0007] The housing comprises a front cover and a lens barrel, wherein the front cover is mounted at the front end opening of the lens barrel;

[0008] A low-light objective lens assembly is mounted on the front cover and defines a low-light optical axis;

[0009] An image intensifier bracket is arranged at the rear end of the low-light-level objective lens assembly along the low-light-level optical axis and is detachably connected to the front cover plate. The bracket includes a mounting tube, an adjusting screw ring, and an elastic member. An image intensifier is mounted in the mounting tube in the following manner: the front end of the image intensifier abuts against the front cover plate, and the rear end of the image intensifier abuts against the rear end of the mounting tube via the elastic member.

[0010] an eyepiece assembly, arranged at the rear end along the low-light optical axis;

[0011] Wherein, the two ends of the adjusting screw ring along the direction of the micro-light axis are respectively connected to the front cover plate and the mounting tube through reverse threads, so that when the adjusting screw ring is rotated, the mounting tube and the front cover plate move toward or away from each other along the direction of the micro-light axis.

[0012] In one embodiment, a threaded interface is formed at the rear end of the front cover, and a barrel-end thread is formed at the front end of the mounting tube. The barrel-end thread and the external thread of the threaded interface have opposite spiral directions. The inner wall of the adjusting screw ring facing the mounting tube has a first internal thread that is threadably connected to the barrel-end thread, and the inner wall of the adjusting screw ring facing the front cover has a second internal thread that is threadably connected to the threaded interface. The first and second internal threads have opposite spiral directions.

[0013] In one embodiment, the adjusting screw ring is an annular structure that is larger than the outer wall of the image intensifier, the surface of the adjusting screw ring is provided with twill knurling, and a plurality of small holes for observing the installation position are provided on the cylindrical wall of the adjusting screw ring around the low-light optical axis.

[0014] In one embodiment, the front cover plate is provided with a micro-light mirror hole for installing the micro-light mirror group, and the rear end of the micro-light mirror hole forms the threaded interface around the axis of the micro-light mirror hole. The threaded interface extends around the micro-light mirror hole along the micro-light optical axis toward the rear end, and the front end of the image intensifier abuts against the end face of the threaded interface.

[0015] In one embodiment, a positioning notch with an opening toward the rear end is provided on the side wall of the threaded interface, and a lug protrudes from the front end of the mounting tube, and the lug is inserted into the positioning notch along the direction of the micro-light axis to constrain the rotational freedom of the mounting tube around the micro-light axis.

[0016] In one embodiment, the installation tube is cylindrical and has a hollow portion.

[0017] In one embodiment, a mounting column for mounting a main control board is provided on an outer wall of the mounting tube.

[0018] In one embodiment, the main control board integrates a power supply circuit for powering the image intensifier. The main control board is detachably provided with a power supply spring via a conductive screw. The power supply spring extends from the hollow portion into the interior of the mounting tube and contacts the contacts of the image intensifier.

[0019] In one embodiment, the first monocular group further includes an infrared lens group and an image combiner, and the low-light-level night vision device further includes a display assembly. The infrared lens group is mounted on the front cover and defines an infrared optical axis parallel to the low-light-level optical axis. The image combiner is arranged between the image intensifier and the eyepiece group along the low-light-level optical axis. The display assembly is arranged on one side of the image combiner and connected to the infrared lens group to display the thermal image of the sensed infrared light. The image combiner is fixedly connected to the rear end of the mounting tube to form an integrated bracket with the mounting tube.

[0020] In one embodiment, the image combiner includes an optical lens and a metal frame, and the metal frame is covered on the outside of the optical lens; the display component is directly fixed to the image combiner to form an integral body, or a display screen bracket for fixing the display component is provided on the metal frame, and the display component is installed on the display screen bracket by adjusting a gasket.

[0021] In one embodiment, the front cover is flat and has an infrared mirror hole for installing the infrared mirror group. The infrared mirror group includes an infrared objective lens, an infrared objective lens flange, a flange sealing ring and an infrared detector arranged along the infrared optical axis. The infrared objective lens is fixed in the infrared objective lens flange. The infrared objective lens flange is installed from the front end to the infrared mirror hole on the front cover through the flange sealing ring, and the infrared detector is installed from the rear end to the infrared mirror hole.

[0022] In one embodiment, the front cover is installed at the front end opening of the lens barrel through a front end cover sealing ring, and the eyepiece group is installed at the rear end of the lens barrel through an eyepiece end sealing foam pad.

[0023] In one embodiment, a second monocular lens group is further included, and the first monocular lens group and the second monocular lens group are connected by a connecting bridge group.

[0024] In one embodiment, the first monocular lens assembly further includes a bridge interface component for connecting to the connecting bridge assembly, and the bridge interface component is installed at the opening at the top of the lens barrel through a bridge interface sealing ring. Beneficial effects

[0025] The low-light-level night vision device provided by the embodiment of the present application has at least the following beneficial effects: The present application provides a low-light-level night vision device, which adopts an image intensifier bracket to detachably connect the image intensifier to the front cover plate. The image intensifier can be installed, replaced, and adjusted through the image intensifier bracket, and can be adapted to different image intensifiers; the image intensifier bracket has the characteristics of small size, simple structure, high stability, and good disassembly and assembly repeatability, so that the user can disassemble and replace the image intensifier by himself, and reset the optical system to ensure the quality of optical imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the three-dimensional structure of a low-light-level night vision device according to an embodiment of the present application;

[0027] FIG2 is a schematic diagram of the three-dimensional structure of the right eyepiece assembly of the low-light-level night vision device in FIG1 ;

[0028] FIG3 is a schematic diagram of the exploded structure of the right eyepiece assembly in FIG2 ;

[0029] FIG4 is a schematic side view of a portion of the right eyepiece assembly in FIG3 mounted on the front cover;

[0030] FIG5 is a schematic diagram of the exploded structure of the portion mounted on the front cover in FIG4 ;

[0031] FIG6 is a schematic diagram of the three-dimensional structure of the mounting tube and the image combiner in FIG5 ;

[0032] FIG. 7 is a schematic diagram of the three-dimensional structure of the mounting tube and the image combiner in FIG. 6 from another angle.

[0033] The components in the figure are numbered as follows:

[0034] Right eyepiece set 10;

[0035] Housing 11, low-light objective lens assembly 12, infrared lens assembly 13, eyepiece assembly 14, bridge interface 15, image intensifier bracket 16, display assembly 17, image intensifier 18, antenna assembly 19, main control board 101, power supply shrapnel 102;

[0036] Front cover 111, lens barrel 112, front cover sealing ring 113, eyepiece end sealing foam pad 114, bridge interface sealing ring 115;

[0037] Micro-mirror hole 1111, infrared mirror hole 1112, threaded interface 1113, positioning notch 1114;

[0038] Infrared objective lens 131, infrared objective lens flange 132, flange sealing ring 133, infrared detector 134;

[0039] Eyepiece lens assembly 141, eyepiece hand wheel 142;

[0040] Installing tube 161, adjusting screw ring 162, image combiner 163, elastic member 164;

[0041] The barrel has threads 1611, hollowing 1612, lugs 1613, and mounting posts 1614;

[0042] First internal thread 1621, second internal thread 1622;

[0043] Optical lens 1631, metal frame 1632;

[0044] Left eyepiece group 20;

[0045] Connecting bridge group 30;

[0046] Low-light-level night vision device 100. Modes for Carrying Out the Invention

[0047] The technical solution of this application is further elaborated in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit the implementation of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0051] The structural size differences of low-light-level image intensifiers of different specifications are mainly reflected in the length of the device and the position of the fluorescent screen and cathode surface. Existing night vision devices generally use a fixed image intensifier position and then perform optical debugging through eyepiece and objective lens focusing compensation. Specifically, parallax is compensated by adjusting the relative position of the eyepiece and the fluorescent screen (for example, if the human eye is nearsighted, it can also be observed clearly by adjusting the eyepiece); aberration is compensated by adjusting the relative position of the objective lens and the cathode surface (for example, the position of the imaging surface changes due to different optical lens states at different temperatures, making the image blurred, which can be corrected by adjusting the objective lens). The present application provides a low-light-level night vision device that can be adapted to a variety of low-light-level image intensifiers and ensure the stability of the optical system.

[0052] Please refer to Figure 1, which is a schematic diagram of the structure of a low-light-level night vision device 100 provided in an embodiment of the present application. The low-light-level night vision device 100 shown in the figure includes a right eyepiece assembly 10 (i.e., a first monocular assembly), a left eyepiece assembly 20 (i.e., a second monocular assembly), and a connecting bridge assembly 30. The right eyepiece assembly 10 and the left eyepiece assembly 20 are connected by the connecting bridge assembly 30 to form a binocular, dual-channel night vision imaging device.

[0053] Referring to Figure 2, the structure of the right eyepiece assembly 10 for low-light-level and infrared dual-light fusion imaging is shown. It integrates a low-light-level objective lens assembly 12 for low-light-level night vision, an infrared lens assembly 13 for thermal imaging, and a bridge interface 15 for gull-wing flipping. This bridge interface 15 connects to a connecting bridge assembly 30, thereby integrally connecting the right eyepiece assembly 10 and the left eyepiece assembly 20. Thus, the low-light-level night vision device 100 is a binocular, dual-channel, dual-light fusion night vision imaging device with functions such as panning, flipping, and gull-wing flipping.

[0054] Please refer to Figures 2 to 5. Specifically, the right eyepiece group 10 includes a housing 11, a low-light level objective lens group 12, an infrared lens group 13, an eyepiece group 14, a bridge interface component 15, a main control board 101, an image intensifier bracket 16, a display component 17, an image intensifier 18 and an antenna component 19, wherein the low-light level objective lens group 12, the infrared lens group 13, the eyepiece group 14 and the bridge interface component 15 are installed on the housing 11, and the main control board 101, the image intensifier bracket 16, the display component 17, the image intensifier 18 and the antenna component 19 are installed inside the housing 11.

[0055] It should be noted that when the low-light-level night vision device 100 is sold as a product, the right eyepiece assembly 10 may not have the image intensifier 18 inside. After purchasing the product, consumers can purchase and install the image intensifier according to their personal preferences before using it.

[0056] The outer shell 11 includes a front cover plate 111 and a lens barrel 112. The front cover plate 111 is installed at the front end opening of the lens barrel 112 through a front end cover sealing ring 113. The eyepiece group 14 is installed at the rear end of the lens barrel 112 through an eyepiece end sealing foam pad 114. The bridge interface part 15 is installed at the opening at the top of the lens barrel 112 through a bridge interface sealing ring 115, thereby realizing the structural sealing inside the outer shell 11 and ensuring the sealing of the overall structure of the right eyepiece group 10.

[0057] The low-light objective lens group 12 and the infrared lens group 13 are installed on the front cover 111, the image intensifier bracket 16 is adjustably connected to the front cover 111, the eyepiece group 14, the display component 17, the image intensifier 18 and the main control board 101 are all installed on the image intensifier bracket 16, and the antenna assembly 19 is installed in the lens barrel 112.

[0058] Continuing with Figures 4 and 5 , the front cover 111 is a flat plate that encloses the front opening of the lens barrel 112. It includes a micro-light lens aperture 1111 and an infrared lens aperture 1112, which are respectively used to mount the micro-light lens assembly 12 and the infrared lens assembly 13. The micro-light lens assembly 12 and the infrared lens assembly 13 are mounted side by side on the front cover 111, with the micro-light lens assembly 12 and the infrared lens assembly 13 parallel to each other. Because the micro-light lens assembly 12 and the infrared lens assembly 13 are coplanar with the front cover 111, assembly and adjustment of the optical system is simplified.

[0059] A threaded interface 1113 is formed at the rear end of the micro-mirror aperture 1111, around the axis of the micro-mirror aperture 1111 (the micro-light optical axis), for mounting and adjusting the image intensifier bracket 16. Positioning notches 1114, opening toward the rear end, are also formed on the sidewalls of the threaded interface 1113. In the illustrated embodiment, two positioning notches 1114 are arranged diametrically around the threaded interface 1113. The threaded interface 1113, which connects to the image intensifier bracket 16, is designed directly on the front cover 111, utilizing a one-piece design that reduces adapters and provides greater stability. The thickness of the bottom of the threaded interface 1113 also enhances the overall structural strength of the front cover 111. Furthermore, numerous ribs can be added to the surface of the front cover 111 to reduce thickness and weight without compromising overall strength.

[0060] The infrared lens assembly 13 includes an infrared objective lens 131, an infrared objective lens flange 132, a flange sealing ring 133, and an infrared detector 134. The infrared objective lens 131 is fixed to the infrared objective lens flange 132. The infrared objective lens flange 132 is installed from the front end into the infrared lens hole 1112 on the front cover 111 via the flange sealing ring 133. The infrared detector 134 is installed at the rear end of the infrared lens hole 1112 along the infrared optical axis to sense the infrared light focused by the infrared objective lens 131. Existing infrared objective lenses and infrared detectors are generally installed separately on either side of a cover or housing, connecting the entire infrared lens assembly in series through the cover or housing. Infrared imaging is adjusted by adjusting the relative position of the infrared objective lens and infrared detector. In the illustrated embodiment, the infrared objective lens 131 is not directly mounted on the front cover plate 111, but is mounted on the front cover plate 111 via the infrared objective lens flange 132. The infrared imaging position is adjusted by moving the infrared objective lens flange 132 (with the infrared objective lens 131), which is safer than directly moving the infrared detector in the prior art and can protect the relatively fragile infrared detector.

[0061] The eyepiece assembly 14 includes an eyepiece lens assembly 141 and an eyepiece handwheel 142. The eyepiece lens assembly 141 is mounted on the image intensifier bracket 16 along the micro-light axis and protrudes from the rear end of the lens barrel 112. The eyepiece handwheel 142 is mounted to the eyepiece lens assembly 141 from the rear end. Existing eyepieces are typically mounted directly on the housing, but thin shell-like structures are susceptible to deformation under stress. In the illustrated embodiment, to improve the stability of the image-combining optical system, this mechanism directly assembles the eyepiece lens assembly 141 with the image intensifier bracket 16 (and the image combiner 163 thereon). A sealing foam pad 114 is used between the eyepiece end and the lens barrel 112 to provide a seal and cushioning effect, reducing the impact of lens barrel 112 deformation on the optical structure. Furthermore, the eyepiece lens assembly 141 abandons the conventional end-face mounting method and is mounted to the image intensifier bracket 16 via side-locking screws, thereby reducing the diameter of the lens assembly.

[0062] The low-light-level objective lens assembly 12 and image intensifier 18 are the primary components of the low-light-level night vision system of the low-light-level night vision device 100. The infrared lens assembly 13, namely the infrared objective lens 131 and infrared detector 134, is the primary component of the thermal imaging system. The image intensifier bracket 16 (with the image combiner 163 thereon), the display assembly 17, and the eyepiece lens assembly 141 are the primary components of the combined image display system. The three optical systems, namely the low-light-level night vision system, the thermal imaging system, and the combined image display system, are all integrated and mounted on the front cover 111, forming the module shown in Figure 4, making the overall structure very compact.

[0063] The image intensifier bracket 16 is positioned at the rear end of the low-light-level objective lens assembly 12 along the low-light-level optical axis and is removably mounted to the front cover 111. The image intensifier bracket 16 comprises a mounting tube 161, an adjustment screw 162, an image combiner 163, and an elastic member 164. The mounting tube 161 is the main body for accommodating the image intensifier 18. The adjustment screw 162 has one end threaded onto the front end of the mounting tube 161 and the other end threadedly connected to a threaded interface 1113 at the rear end of the front cover 111. The elastic member 164 is positioned at the bottom of the mounting tube 161, positioned between the image intensifier 18 and the image combiner 163. This ensures stable mounting of the image intensifier 18 and facilitates adjustment of its position along the low-light-level optical axis in conjunction with the adjustment screw 162. The rear end of the mounting tube 161 is an image combiner 163, and the front end is an opening for inserting the image intensifier 18 and is provided with a tube opening thread 1611. Referring to Figure 6 , a lug 1613 protrudes forward from the front end of the mounting tube 161, and a mounting post 1614 is provided on the outer wall of the mounting tube 161. The image combiner 163 and the mounting tube 161 for the image intensifier 18 are combined into the image intensifier bracket 16. This integrated design also makes the support structure more stable.

[0064] Referring to Figures 6 and 7 , the mounting tube 161 utilizes a cylindrical framework, securely securing the image intensifier 18. This framework is constructed of an ultra-light magnesium alloy, and further reduced in weight by a hollow section 1612 defined within the mounting tube 161. The image intensifier 18 is inserted through the front opening of the mounting tube 161. The front lug 1613 passes through the adjustment screw 162 and engages with the positioning notch 1114 defined in the threaded interface 1113, thereby constraining the mounting tube 161's rotational freedom about the micro-light optical axis.

[0065] A first internal thread 1621 is provided on the inner wall of the end of the adjusting screw 162 facing the mounting tube 161, which is threadedly connected to the tube opening thread 1611 of the mounting tube 161. A second internal thread 1622 is provided on the inner wall of the other end of the adjusting screw 162 facing the front cover 111. This second internal thread 1622 is threadedly connected to the threaded interface 1113 on the front cover 111, thereby connecting the mounting tube 1611 and the front cover 111 along the twilight optical axis. The internal threads of the first and second internal threads 1621, 1622 have opposite spiral directions. Correspondingly, the external threads of the tube opening thread 1611 and the threaded interface 1113 have opposite spiral directions. As a result, the first internal thread 1621 and the tube opening thread 1611 form threads in opposite directions with the second internal thread 1622 and the threaded interface 1113. By rotating the adjusting screw 162, the position of the mounting tube 161 and the image combiner 163 relative to the front cover 111 on the twilight optical axis changes. The front end of the image intensifier 18 abuts against the end surface of the threaded interface 113, while the rear end abuts against the bottom of the mounting tube 161 via one end of an elastic member 164. By rotating the adjustment screw 162, the mounting tube 161 and the front cover 111 move toward or away from each other, and the position of the image combiner 163, which is fixedly connected to the mounting tube 161, changes accordingly. This allows for adjusting the relative distance between the image combiner 163 and the image intensifier 18 and allows for adaption to different models of image intensifiers 18.

[0066] Adjustment screw 162 is key to adapting to different image intensifier models. By cooperating with adjustment screw 162, elastic member 164, mounting tube 161, and front cover 111, the relative position of image combiner 163 and image intensifier 18 along the low-light-level optical axis can be adjusted. Adjustment screw 162 utilizes a ring-shaped structure that is uniformly enlarged by one circle relative to the outer wall of image intensifier 18, minimizing the overall diameter of right eyepiece assembly 10. Adjustment screw 162 also serves as the key to connecting the entire right low-light-level objective assembly.

[0067] The adjusting screw ring 162 can be made of an aluminum alloy with a higher hardness, and a surface can be provided with a diagonal knurling to increase friction and facilitate hand-tightening. The cylinder wall of the adjusting screw ring 162 can also be provided with four small holes around the micro-light axis to observe the installation position.

[0068] The image combiner 163 is a prism-type image combining device composed of a metal frame 1632 and an optical lens 1631, and is located between the eyepiece group 14 and the image intensifier 18. The image combiner 163 adopts a metal all-enclosed prism design to protect the internal optical lens 1631. Existing image combiners are generally installed directly inside the shell, which is susceptible to shell deformation, and is not convenient to install and debug when the inner tube of the shell is deep. Compared with the existing design, connecting the image combiner 163 and the mounting tube 161 as a whole can reduce the adapter between the image combiner 163 and the image intensifier 18, making the overall structure more stable, and also allowing the debugging of the image combiner 163 to be carried out without the obstruction of the outer shell, reducing the difficulty of installation and adjustment.

[0069] A display screen bracket for fixing the display assembly 17 may also be integrated on the metal frame 1632 of the image combiner 163 , so that the display assembly 17 can be directly installed on the metal frame 1632 of the image combiner 163 .

[0070] The elastic member 164 is disposed within the mounting tube 161 and abuts the end of the image intensifier 18 away from the adjustment screw 162, thereby ensuring the proper positioning of the image intensifier 18 and accommodating differences in the dimensions of different image intensifiers 18 along the twilight optical axis. In the illustrated embodiment, the elastic member 164 is a spring sheet, and the portion along the twilight optical axis is hollowed out to not affect light propagation along the twilight optical axis. In other embodiments, the elastic member 164 may also be a compression spring or an elastic rubber pad with a central hole, etc., which are not specifically listed here.

[0071] The display assembly 17 is connected to the infrared detector 134 signal to receive and display the thermal image of the infrared light sensed by the infrared detector 134. The display assembly 17 includes an OLED screen and a screen bracket. The screen bracket fully encloses the OLED screen for protection and is mounted on the mounting tube 161 in a position corresponding to the image combiner 163. When the image intensifier 18 used in the low-light-level night vision device 100 is a fixed model, the display assembly 17 and the image combiner 163 can be designed as an integrated whole. Of course, to accommodate more types of image intensifiers, in the illustrated embodiment, the display assembly 17 is separated from the image combiner 163 fixed on the mounting tube 161. The relative position of the display assembly 17 and the image combiner 163 can be adjusted by adjusting the gasket to achieve infrared and low-light image combination.

[0072] The main control board 101 is fixed to the mounting post 1614 on the mounting tube 161 by fasteners, thereby fixing the main control board 101 to the tube wall of the mounting tube 161. The main control board 101 integrates the power supply circuit of the image intensifier 18. For the power supply scheme of the image intensifier 18, in addition to the power supply method of connecting cables, a scheme of powering by copper-plated power supply shrapnel 102 is also prepared. The power supply shrapnel 102 is detachably mounted on the main control board 101 by conductive screws. The power supply shrapnel 102 can extend into the interior of the mounting tube 161 through the hollow 1612 of the mounting tube 161 to contact the contacts on the image intensifier 18. The image intensifier 18 can be installed in the mounting tube 161, and the contacts can directly contact the power supply shrapnel 102 to achieve power supply, providing a quick installation solution for users to assemble the image intensifier themselves.

[0073] The above-mentioned low-light-level night vision device 100 has a smaller size of the mounting structure of the image intensifier 18, so that the overall weight of this product can be reduced to 550g on the basis of realizing functions such as binocular dual-channel, dual-light fusion night vision imaging, flat rotation, upward flip and gull-wing flip, which is significantly lighter than the weight of similar products.

[0074] It should be noted that the low-light-level night vision device 100 in the illustrated embodiment is a binocular dual-channel night vision device. In other embodiments, the low-light-level night vision device 100 may also be a night vision device having only the right eyepiece group 10 as a single eyepiece group, which is not limited here.

[0075] On the other hand, in the illustrated embodiment, the right eyepiece assembly 10 is a dual-spectrum night vision goggle capable of low-light and infrared imaging. In other embodiments, the right eyepiece assembly 10 may also be a single-spectrum night vision goggle capable of low-light imaging only. When the right eyepiece assembly 10 is a low-light night vision goggle, the infrared lens hole 1112 is not required on the front cover 111, and the infrared lens assembly 13, display assembly 17, and image combiner 163 on the image intensifier bracket 16 can all be omitted.

[0076] In summary, the present application provides a low-light-level night vision device, which uses an image intensifier bracket that can adapt to a variety of low-light-level image intensifiers, including domestic second-generation and half image intensifiers and third-generation image intensifiers at home and abroad, and cooperates with the installation and adjustment structure of the front cover to better meet the needs of users in different regions. The low-light-level night vision device of the present application can realize the assembly of different types of low-light-level image intensifiers on the same night vision device, and complete low-light-level and infrared dual-light fusion night vision imaging. The installation and adjustment structure has the characteristics of small size, simple structure, high stability, and good disassembly and assembly repeatability, so that users of the low-light-level night vision device can disassemble and replace the low-light-level image intensifier by themselves without special training, and reset the optical system to ensure the quality of optical imaging. The low-light-level night vision device of the present application helps users achieve the vision of being able to realize a configuration solution that suits them on the same night vision device.

[0077] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising 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 apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0078] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A low-light-level night vision device, characterized in that: The device comprises a first monocular lens assembly, wherein the first monocular lens assembly comprises: The housing (11) comprises a front cover (111) and a lens barrel (112), wherein the front cover (111) is mounted at the front end opening of the lens barrel (112); A low-light objective lens assembly (12) is mounted on the front cover (111) and defines a low-light optical axis; An image intensifier bracket (16) is arranged at the rear end of the low-light objective lens group (12) along the low-light optical axis and is detachably connected to the front cover plate (111). The bracket comprises a mounting tube (161), an adjusting screw ring (162) and an elastic member (164). An image intensifier (18) is mounted in the mounting tube (161) in the following manner: the front end of the image intensifier (18) abuts against the front cover plate (111), and the rear end of the image intensifier (18) abuts against the rear end of the mounting tube (161) via the elastic member (164); an eyepiece assembly (14) arranged at the rear end along the micro-light axis; Wherein, the two ends of the adjusting screw ring (162) along the direction of the micro-light optical axis are respectively connected to the front cover plate (111) and the mounting tube (161) through reverse threads, so that when the adjusting screw ring (162) is rotated, the mounting tube (161) and the front cover plate (111) move toward or away from each other along the direction of the micro-light optical axis.

2. The low-light-level night vision device according to claim 1, characterized in that: A threaded interface (1113) is formed at the rear end of the front cover (111), and a barrel mouth thread (1611) is provided at the front end of the mounting cylinder (161), and the barrel mouth thread (1611) and the external thread of the threaded interface (1113) have opposite spiral directions; the inner wall of the adjusting screw ring (162) facing one end of the mounting cylinder (161) is provided with a first internal thread (1621) threadedly connected to the barrel mouth thread (1611), and the inner wall of the adjusting screw ring (162) facing one end of the front cover (111) is provided with a second internal thread (1622) threadedly connected to the threaded interface (1113), and the spiral directions of the first internal thread (1621) and the second internal thread (1622) are opposite.

3. The low-light-level night vision device according to claim 2, characterized in that: The adjusting screw ring (162) is an annular structure that is larger than the outer wall of the image intensifier (18). The surface of the adjusting screw ring (162) is provided with a diagonal knurling. A plurality of small holes for observing the installation position are provided on the cylindrical wall of the adjusting screw ring (162) around the micro-light axis.

4. The low-light-level night vision device according to claim 2, characterized in that: The front cover plate (111) is provided with a micro-light mirror hole (1111) for mounting the micro-light objective lens group (12); the rear end of the micro-light mirror hole (1111) forms the threaded interface (1113) around the axis of the micro-light mirror hole (1111); the threaded interface (1113) extends around the micro-light mirror hole (1111) toward the rear end along the micro-light optical axis; the front end of the image intensifier (18) abuts against the end face of the threaded interface (1113).

5. The low-light-level night vision device according to claim 2, characterized in that: A positioning notch (1114) with an opening toward the rear end is provided on the side wall of the threaded interface (1113); a lug (1613) protrudes from the front end of the mounting tube (161); and the lug (1613) is engaged with the positioning notch (1114) along the direction of the micro-light axis to constrain the rotational freedom of the mounting tube (161) around the micro-light axis.

6. The low-light-level night vision device according to claim 1, characterized in that: The installation tube (161) is cylindrical and has a hollow portion (1612).

7. The low-light-level night vision device according to claim 6, characterized in that: An installation column (1614) for installing the main control board (101) is provided on the outer wall of the installation cylinder (161).

8. The low-light-level night vision device according to claim 7, characterized in that: The main control board (101) is integrated with a power supply circuit for supplying power to the image intensifier (18); a power supply spring (102) is detachably mounted on the main control board (101) via a conductive screw; the power supply spring (102) extends from the hollow portion (1612) into the interior of the mounting tube (161) and contacts the contact point of the image intensifier (18).

9. The low-light-level night vision device according to any one of claims 1 to 8, characterized in that: The first monocular lens group further includes an infrared lens group (13) and an image combiner (163), and the low-light-level night vision device further includes a display assembly (17). The infrared lens group (13) is mounted on the front cover (111) and defines an infrared optical axis parallel to the low-light-level optical axis. The image combiner (163) is arranged between the image intensifier (18) and the eyepiece group (14) along the low-light-level optical axis. The display assembly (17) is arranged on one side of the image combiner (163) and connected to the infrared lens group (13) to display a thermal image of the sensed infrared light. The image combiner (163) is fixedly connected to the rear end of the mounting tube (161) to form an integrated bracket with the mounting tube (161).

10. The low-light-level night vision device according to claim 9, characterized in that: The image combiner (163) includes an optical lens (1631) and a metal frame (1632), wherein the metal frame (1632) is covered on the outside of the optical lens (1631); the display component (17) is directly fixed to the image combiner (163) to form an integral body, or a display screen bracket for fixing the display component (17) is provided on the metal frame (1632), and the display component (17) is mounted on the display screen bracket by adjusting a gasket.

11. The low-light-level night vision device according to claim 9, characterized in that: The front cover (111) is flat and has an infrared mirror hole (1112) for installing the infrared mirror group (13). The infrared mirror group (13) includes an infrared objective lens (131) arranged along the infrared optical axis, an infrared objective lens flange (132), a flange sealing ring (133) and an infrared detector (134). The infrared objective lens (131) is fixed in the infrared objective lens flange (132). The infrared objective lens flange (132) is installed from the front end to the infrared mirror hole (1112) on the front cover (111) through the flange sealing ring (133). The infrared detector (134) is installed from the rear end to the infrared mirror hole (1112).

12. The low-light-level night vision device according to claim 1, characterized in that: The front cover plate (111) is mounted on the front opening of the lens barrel (112) via a front cover sealing ring (113), and the eyepiece assembly (14) is mounted on the rear end of the lens barrel (112) via an eyepiece end sealing foam pad (114).

13. The low-light-level night vision device according to claim 1, characterized in that: It also includes a second monocular lens group, and the first monocular lens group and the second monocular lens group are connected via a connecting bridge group (30).

14. The low-light-level night vision device according to claim 13, characterized in that: The first monocular lens assembly further comprises a bridge interface component (15) for connecting to the connecting bridge assembly (30); the bridge interface component (15) is installed at the opening at the top of the lens barrel (112) via a bridge interface sealing ring (115).

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