Splicing type wide-field-of-view head-mounted night vision device

Abstract

The utility model discloses a splicing type wide-view-field head-mounted night vision device, which adopts a scheme of combining two groups of low-light imaging channels and one group of infrared imaging assembly, obtains a wide view field in a view field splicing mode, and sends and displays an image by using an optical waveguide module to obtain an AR night vision visual effect. The spliced wide-field-of-view head-mounted night vision device has the functional characteristics of wide field of view, low prominent appearance, low-light and infrared fusion images and AR (Augmented Reality) display. According to the head-mounted night vision goggles, an optical waveguide AR transmitting and displaying scheme is introduced, the overall layout is optimally designed, and the wearing comfort of the traditional head-mounted night vision goggles is improved. By means of the device, wide-view-field night vision images and digital information can be observed, a real scene in front can be directly seen, and the device is suitable for work such as night reconnaissance and advancing in a complex environment.

Description

Technical Field

[0001] This utility model relates to low-light night vision goggles, specifically to a spliced ​​wide-field head-mounted night vision device. Background Technology

[0002] Night vision goggles are head-mounted low-light observation devices. A typical night vision goggle has a 40° field of view and a dual-channel imaging structure (dual-tube binocular). Wide-field-of-view night vision goggles have a horizontal field of view greater than 60°, enabling the acquisition of a wider range of instantaneous field of view information. These goggles typically employ a four-channel low-light imaging structure, with each channel consisting of an objective lens, an image intensifier, and an eyepiece. The two middle imaging channels, representing the main field of view, are arranged at a specific angle with the left and right auxiliary fields of view of the left and right channels, forming a stitched field of view, such as... Figure 1 , Figure 2 As shown.

[0003] At night, the target is imaged onto the cathode surface of the image intensifier via the objective lens. The strong electric field of the image intensifier's electro-optical system amplifies the image brightness by tens of thousands of times on the fluorescent screen of the image tube, and the image is then magnified by the eyepiece for human observation. Low-light image information acquired simultaneously by four low-light imaging channels is integrated, and the field of view is improved by processing complementary information between multiple low-light images, generating a wide-field low-light image.

[0004] The optical axes of the four low-light imaging channels are arranged at a certain angle around the center of rotation of the human eye and overlap in the direction of the eyepiece, so that the human eye can simultaneously receive local images from the four imaging channels. The local images observed by both eyes are then fused by the brain's vision to form a continuous and complete wide-field night vision image.

[0005] AR (Augmented Reality) is a technology that overlays virtual information onto real-world scenes. It typically creates virtual images within the monocular or binocular field of view. Near-eye display (NAV) uses a display device placed at a distance from the human eye (not directly visible) to render light field information to the eye, providing an immersive, close-up view for observation. Currently, the mainstream NAV technologies on the market mainly include waveguides and freeform surfaces, which are widely used in the consumer AR glasses field.

[0006] Typical wide-field-of-view night vision goggles employ a four-channel low-light imaging optical-mechanical structure, enabling the acquisition of a wider instantaneous field of view. This allows users to observe a larger field of view without turning their heads, improving reaction speed and operational safety in nighttime missions and harsh environments, and has played its due role in practice. However, head-mounted wide-field-of-view night vision goggles, due to their four-channel low-light imaging optical-mechanical structure, are larger in size, with the weight concentrated on the tube housing the objective lens, image intensifier, and eyepiece. When worn, the protruding and elongated structure shifts the center of gravity forward, causing some strain on the wearer's neck and affecting wearing comfort. In addition, these night vision goggles only provide direct visual low-light images and lack digital capabilities such as low-light / infrared image fusion, limiting their observation and identification capabilities in complex environments. Utility Model Content

[0007] The purpose of this invention is to provide a splicing wide-field head-mounted night vision device, the main technical problems of which include:

[0008] (1) Solve the problems of existing wide field-of-view night vision glasses, such as the four-channel low-light imaging optical engine structure, the prominent shape structure, the forward shift of the center of gravity of the whole device, and the impact on continuous wear.

[0009] (2) To address the defects or deficiencies of existing night vision modes such as single mode and no fusion image mode, the product has a wide field of view and low protrusion shape structure, and optimizes wearing comfort.

[0010] (3) It has low-light, infrared and fusion image modes to meet the requirements of nighttime reconnaissance and movement in complex environmental scenarios.

[0011] The technical solution of this utility model is as follows:

[0012] A spliced ​​wide field-of-view head-mounted night vision device includes two low-light imaging channel structures. Each channel consists of an objective lens, a low-light imaging device, and a display module. The two imaging channels are arranged symmetrically at a certain angle to form a spliced ​​field of view.

[0013] At night, the target image is projected onto the target surface of the low-light imaging device via an objective lens. The device's electronic system processes the image and outputs a video signal, which is then displayed and magnified on a display module for human observation. Low-light image information acquired simultaneously by two imaging channels is combined, and overlapping local images are stitched together to increase the amount of image information. The field of view is expanded by processing complementary information between the two images, generating a wide-field-of-view low-light image. The optical axes of the two low-light imaging channels are arranged at a certain angle around the center of human eye rotation, allowing the human eye to simultaneously receive local images from both imaging channels. Through visual fusion by the brain, the local images observed by both eyes are combined to form a complete wide-field-of-view night vision image. The middle channel is an infrared imaging component. Its infrared video signal is processed electronically on the main control circuit board, superimposing the left and right field-of-view signals with the low-light images from the left and right low-light imaging channels, respectively, and then sent to a specific display area for display, forming a low-light / infrared fused image in the central field of view of both eyes. Finally, a wide-field-of-view AR display is achieved through an optical waveguide display group, enabling observation of the target.

[0014] Specifically, the splicing wide field-of-view head-mounted night vision device of this utility model consists of a night vision glasses body, goggles 15 and a battery box assembly;

[0015] The night vision glasses are composed of a front shell 1, a hanging interface 2, an infrared imaging group 3, a left low-light imaging group 4, a right low-light imaging group 5, a main control circuit board 6, a shuttle knob 7, a reset button 8, a power interface 9, a rear shell 10, a left optical waveguide module 11, a right optical waveguide module 12, an aviation plug interface 13, and a lower shell 14.

[0016] The battery box assembly consists of a battery box 16, a battery box power supply interface 17, and a Velcro strap 18.

[0017] The night vision goggles are mounted on the hanger of a universal helmet via the hanger interface 2. The power interface 9 is connected to the battery box power interface 17 after the power cable is inserted. The goggles 15 are mounted below the lower shell 14 of the night vision goggles so that the goggles fit snugly against the face. The battery box assembly is fixed to the back of the helmet via the battery box Velcro 18.

[0018] The infrared imaging group 3 (including an infrared objective lens and an infrared detector) and the left and right low-light imaging groups 4 and 5 (including low-light objectives lens and low-light imaging devices) are respectively installed inside the front housing 1. The infrared detector is mounted on the lens barrel of the infrared objective lens via an adapter plate. The lens barrel and the infrared detector are fixed to the front housing 1 with screws. The optical axis of the infrared objective lens group 3 is located at the center of the front. The low-light lens barrel fixing surface on the front housing 1 forms a certain angle with the infrared lens barrel fixing surface. The low-light lens barrel is connected to the low-light imaging device via a low-light adapter plate.

[0019] The optical waveguide modules 11 and 12 are mounted below the rear housing 10 by screws, and the lower housing 14 is fixed to the rear housing 10 by screws, which protects the optical waveguide modules.

[0020] The beneficial effects of this utility model are:

[0021] This utility model's spliced ​​wide-field-of-view head-mounted night vision device optimizes the layout of the waveguide display channel and the overall structure, eliminating the forward-protruding shape of traditional night vision goggles. This reduces the neck strain caused by the forward-leaning center of gravity, improving ergonomics. The device employs an infrared and low-light fusion imaging scheme, achieving a wide field of view through splicing while addressing the issue of limited image modes in traditional night vision goggles. Furthermore, the device incorporates an AR imaging module, digitally displaying infrared, low-light, and fused images, and supplementing the display with digital UI information. This overcomes the digital display deficiencies of traditional image intensifier wide-field-of-view night vision goggles, meeting the requirements for nighttime reconnaissance and movement in complex environments. Attached Figure Description

[0022] Figure 1 A schematic diagram of the field of view stitching for a wide field-of-view night vision device.

[0023] Figure 2 1. Visual design of the wide field-of-view night vision goggles.

[0024] Figure 3 A schematic diagram of wide field-of-view low-light image visual stitching.

[0025] Figure 4 Image showing the appearance of AR glasses.

[0026] Figure 5 A schematic diagram illustrating the working principle of a night vision device.

[0027] Figure 6 A schematic diagram of low-light imaging for a night vision device.

[0028] Figure 7 A schematic diagram of the wide field of view of the night vision device.

[0029] Figure 8 A schematic diagram of the structure of a night vision device.

[0030] Figure 9 A diagram illustrating the wearing of a night vision device.

[0031] Figure 10 Assembly diagram of the lens assembly.

[0032] Figure 11 Assembly diagram of the optical waveguide module.

[0033] Figure 12A schematic diagram of the photoelectric system of a night vision device.

[0034] Figure 13 The field-of-view image of the night vision device is sent to the intended display.

[0035] Figure 14 A schematic diagram of the operation of the optical waveguide module.

[0036] In the diagram: 1-Front housing, 2-Hanger interface, 3-Infrared imaging group, 4-Left low-light imaging group, 5-Right low-light imaging group, 6-Main control circuit board, 7-Rocker knob, 8-Reset button, 9-Power interface, 10-Rear housing, 11-Left optical waveguide module, 12-Right optical waveguide module, 13-Aircraft plug interface, 14-Lower housing, 15-Goggles, 16-Battery box, 17-Battery box power supply interface, 18-Hook and loop fastener. Detailed Implementation

[0037] The composition principle of this utility model is as follows: Figure 5 As shown, the imaging scheme includes two low-light imaging channel structures, an infrared component, a main control circuit board, and an optical waveguide display module.

[0038] Each low-light channel consists of an objective lens, a low-light imaging device, and a display module. The two imaging channels are arranged at a certain angle to form a stitched field of view. At night, the target is imaged by the objective lens onto the target surface of the low-light imaging device. The device's electronic system processes the image and outputs a video signal, which is then displayed and magnified on the display module for human observation. The low-light image information acquired simultaneously by the two imaging channels is combined, and the overlapping local images increase the amount of image information. By processing the complementary information between the two images, the field of view is improved, generating a wide-field-of-view low-light image, such as... Figure 6 As shown.

[0039] The optical axes of the two low-light imaging channels are arranged at a certain angle around the center of rotation of the human eye, allowing the human eye to simultaneously receive local images from both imaging channels. Through visual fusion in the brain, the local images observed by both eyes are combined to form a complete wide-field-of-view night vision image, such as... Figure 7 As shown.

[0040] The central channel is an infrared imaging component. The infrared video signal it provides is processed electronically by the main control circuit board. The left and right field-of-view signals are superimposed with the low-light images from the left and right low-light imaging channels, respectively, and then sent to a specific display area for display. This forms a low-light / infrared fused image in the central field-of-view area of ​​the binocular wide field of view. Finally, a wide-field-of-view AR display is achieved through an optical waveguide display group, allowing for observation of the target.

[0041] This utility model's spliced ​​wide-field-of-view head-mounted night vision device consists of a night vision goggles main body, goggles, and a battery pack. Performance specifications are as follows:

[0042] Low-light field of view: ≥65°×24°;

[0043] Infrared field of view: ≥32°×18°;

[0044] Low-light overlapping field of view: ≥20°;

[0045] Low-light visibility distance: Under conditions of visibility of not less than 8km, illuminance of 1×10-3lx~3×10-3lx (clear sky without moon), and opaque background, the recognition distance for a person moving upright is not less than 100m;

[0046] Infrared range: With visibility of at least 8 km, relative humidity not exceeding 60%, and an average temperature difference of 6 K between the target and background,

[0047] The recognition distance for upright individuals should be no less than 200m;

[0048] like Figure 8 As shown, the night vision goggles consist of a front shell 1, a mounting interface 2, an infrared imaging group 3, a left low-light imaging group 4, a right low-light imaging group 5, a main control circuit board 6, a rotary knob 7, a reset button 8, a power interface 9, a rear shell 10, a left optical waveguide module 11, a right optical waveguide module 12, an aviation connector interface 13, and a lower shell 14. The battery box assembly consists of a battery box 16, a battery box power supply interface 17, and Velcro 18.

[0049] like Figure 9 As shown, the night vision goggles are mounted on the universal helmet's hanger via the hanger interface 2. The power interface 9 connects to the battery box power interface 17 after the power cable is inserted. The goggles 15 are mounted below the lower shell 14 of the night vision goggles, allowing them to fit snugly against the face. The battery box assembly is secured to the back of the helmet via the battery box Velcro 18. When worn on a universal helmet, the low-profile design of the night vision goggles brings the center of gravity closer to the head, reducing neck traction and improving wearing comfort.

[0050] like Figure 10 As shown, the infrared imaging group (infrared objective lens, infrared detector) 3 and the low-light imaging group (low-light objective lens, low-light imaging device) 4 and 5 are respectively installed inside the front housing 1. The infrared detector is mounted on the lens barrel of the infrared objective lens via an adapter plate. The lens barrel and the infrared detector are fixed to the front housing 1 with screws. The optical axis of the infrared objective lens group 3 is located at the center of the front. The low-light lens barrel fixing surface on the front housing 1 forms a certain angle with the infrared lens barrel fixing surface. The low-light lens barrel is connected to the low-light imaging device via a low-light adapter plate.

[0051] like Figure 11 As shown, the optical waveguide modules 11 and 12 are mounted on the lower part of the rear housing 10 by screws, and the lower housing 14 is fixed to the rear housing 10 by screws, which provides protection for the optical waveguide modules.

[0052] The optoelectronic system design and working principle of this novel spliced ​​wide-field head-mounted night vision device are as follows:

[0053] The schematic diagram of the optoelectronic system structure of the night vision device is shown below. Figure 12 As shown, according to the imaging channels, the optoelectronic system can be divided into two low-light imaging groups and one infrared imaging group. The infrared imaging group consists of an infrared objective lens, an infrared detector, and an optical waveguide module. The optical axis of the infrared channel is located in the center directly in front of the night vision device. The low-light imaging group consists of a low-light objective lens, a low-light CMOS device, and an optical waveguide module. The optical axes of the two low-light channels are 21° apart and 10.5° each to the optical axis of the infrared imaging group. The stitched full low-light field of view is 65°.

[0054] The diagram illustrates the transmission of field-of-view information acquired through splicing to the optical waveguide module. Figure 13 As shown, the left and right low-light signals are displayed via the left and right waveguide modules respectively. When viewed by both eyes, the brain's visual fusion combines the local visual field images of both eyes to form a complete 65° wide-field-of-view night vision image. After processing, the infrared component's visual field signal is sent to the right side of the left waveguide module for display, and the right infrared field of view is sent to the left side of the right waveguide module for display. In fusion mode, the image signals output from the infrared and low-light modules are processed by the image fusion algorithm of the main control circuit and then superimposed on the waveguide modules to display the registered fused image.

[0055] In the optical waveguide module, the input coupling region couples the signal output and processed by the core circuit into the optical waveguide plate. The light propagates in the waveguide in the form of total internal reflection and enters the human eye for imaging after reaching the output coupling region. Figure 14 This is a schematic diagram of a vertically incident waveguide plate. The waveguide plate mainly consists of a flat substrate, an input coupling region reflective surface, and an output coupling region semi-permeable film. These components are assembled using adhesive bonding, and strict processing flatness ensures that light travels along the designed optical path. When using this night vision device, the waveguide display will not obstruct the view of the target scene in front of the user, and it can display graphics, text, and other UI elements, enabling augmented reality and virtual-real interaction functions, making it suitable for various application scenarios.

[0056] The aforementioned optomechanical structure design enables field-of-view stitching, thereby achieving a wide field of view. The introduction of an optical waveguide module and optimization of the overall structural layout can improve the problem of forward tilt of the center of gravity when wearing night vision devices, thus optimizing the wearing experience. The AR module transmits infrared, low-light, and fused images, and the observation window can not only observe digital night vision images in various modes, but also obtain the real target scene in front by looking directly through the observation window, realizing AR virtual and reality display.

Claims

1. A spliced ​​wide-field-of-view head-mounted night vision device, characterized in that, The night vision device consists of a night vision goggles body, goggles (15) and a battery box assembly; The night vision glasses are composed of a front shell (1), a hanging interface (2), an infrared imaging group (3), a left low-light imaging group (4), a right low-light imaging group (5), a main control circuit board (6), a shuttle knob (7), a reset button (8), a power interface (9), a rear shell (10), a left optical waveguide module (11), a right optical waveguide module (12), an aviation plug interface (13), and a lower shell (14). The battery box assembly consists of a battery box (16), a battery box power supply interface (17), and Velcro (18). The night vision glasses are mounted on the hanger of a general helmet via the hanger interface (2), and the power interface (9) is connected to the battery box power interface (17) after the power cable is inserted. The goggles (15) are mounted below the lower housing (14) of the night vision goggles to ensure a close fit to the face; the battery pack is secured to the back of the helmet via battery pack Velcro (18).

2. The spliced ​​wide-field-of-view head-mounted night vision device according to claim 1, characterized in that: The infrared imaging group (3), the left low-light imaging group (4), and the right low-light imaging group (5) are respectively installed inside the front housing (1).

3. The spliced ​​wide-field head-mounted night vision device according to claim 1, characterized in that: The infrared imaging group (3) includes an infrared objective lens and an infrared detector; The left low-light imaging group (4) and the right low-light imaging group (5) are both composed of low-light objective lenses, low-light CMOS devices and optical waveguide modules.

4. The spliced ​​wide-field-of-view head-mounted night vision device according to claim 3, characterized in that: The infrared detector is mounted on the lens barrel of the infrared objective lens via an adapter plate, and the lens barrel and the infrared detector are fixed to the front housing (1) by screws; the optical axis of the infrared objective lens group (3) is located at the center of the front.

5. The spliced ​​wide-field-of-view head-mounted night vision device according to claim 4, characterized in that: The fixing surface of the low-light lens tube on the front housing (1) is at a certain angle to the fixing surface of the infrared lens tube, and the low-light lens tube is connected to the low-light imaging device through the low-light adapter plate.

6. The spliced ​​wide-field head-mounted night vision device according to claim 3, characterized in that: The optical axes of the left low-light imaging group (4) and the right low-light imaging group (5) are 21° apart and 10.5° apart with the optical axis of the infrared imaging group (3), respectively. The spliced ​​full low-light field of view is 65°.

7. The spliced ​​wide-field head-mounted night vision device according to claim 1, characterized in that: The left optical waveguide module (11) and the right optical waveguide module (12) are installed below the rear housing (10) by screws, and the lower housing (14) is fixed to the rear housing (10) by screws to protect the optical waveguide modules.

8. The spliced ​​wide-field head-mounted night vision device according to any one of claims 1-7, characterized in that, The spliced ​​wide-field head-mounted night vision device includes: Low-light field of view: ≥65°×24°; Infrared field of view: ≥32°×18°; Low-light overlap field of view: ≥20°.

9. The spliced ​​wide-field head-mounted night vision device according to any one of claims 1-7, characterized in that, The spliced ​​wide-field head-mounted night vision device includes: Low-light visibility distance: Under conditions of visibility of not less than 8km, illuminance of 1×10-3lx~3×10-3lx, and opaque background, the recognition distance for upright people is not less than 100m; Infrared line of sight: With visibility of not less than 8km, relative humidity not greater than 60%, and average temperature difference between the target and the background of 6K, the recognition distance for upright people is not less than 200m.

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