Eyepiece assembly, night vision device and method of mounting an eyepiece assembly

Abstract

This invention belongs to the field of night vision technology and discloses an eyepiece assembly, a night vision device, and an installation method for the eyepiece assembly. Axial positioning of the goggles and eyepiece frame is achieved by embedding screws into an annular groove. The screws move circumferentially within the annular groove, facilitating convenient circumferential rotation adjustment of the eyepiece frame and goggles without requiring disassembly and repositioning of the goggles. The goggles are also less likely to detach from the eyepiece frame. The main technical solution of this invention is as follows: an eyepiece assembly with an annular groove and an annular protrusion on the eyepiece frame; an eyepiece through-hole on the goggles; a threaded hole on the goggles sleeve; the goggles sleeve fitted inside the goggles, with the threaded hole corresponding to the goggles through-hole; a pressure ring with a pressure ring through-hole fitted outside the goggles, with the pressure ring through-hole corresponding to the goggles through-hole; the eyepiece frame inserted into the goggles sleeve; the annular protrusion slidingly abutting against the goggles pressure ring; and screws inserted into the pressure ring through-hole and the goggles through-hole, screwed into the threaded hole, with the screw end embedded in the annular groove. This invention is mainly used for night vision.

Description

Technical Field

[0001] This invention relates to the field of night vision technology, and more particularly to an eyepiece assembly, a night vision device, and a method for installing the eyepiece assembly. Background Technology

[0002] When using night vision optical instruments, goggles are required to help the operator achieve the theoretical exit pupil distance of the instrument. In night vision instrument usage scenarios, it is necessary to meet the technical requirements for preventing light leakage at night. To meet these requirements, irregularly shaped goggles are generally used. Compared to round goggles, irregularly shaped goggles are closer to the physiological structure of the human eye, offering greater comfort and ergonomics. In scenarios where irregularly shaped goggles are used, the eyepiece assembly needs to move axially when adjusting diopter, and the irregularly shaped goggles will move axially accordingly.

[0003] In the application scenarios of night vision optical instruments, weight is a critical technical indicator. To reduce the weight of night vision optical instruments, it is necessary to simplify the eyepiece assembly diopter adjustment mechanism, thereby achieving the effect of reducing the overall weight. Existing technology uses a simple threaded structure between the eyepiece assembly and the night vision optical instrument to achieve axial movement of the eyepiece assembly. By rotating the eyepiece assembly, both reliable and efficient diopter adjustment of the eyepiece assembly can be achieved, and the overall weight of the instrument can be reduced.

[0004] In previous designs of irregularly shaped goggles, the goggles were typically fitted directly onto the eyepiece assembly. This resulted in significant friction during rotation, meaning that when using a threaded eyepiece structure with the goggles, the goggles would rotate along with the eyepiece assembly. After adjustment, the goggles were often not positioned correctly for the user's eyes. Current technology requires waiting until the eyepiece assembly is in the correct position before removing the goggles, adjusting their position, and reattaching them. This is not only inconvenient but also prone to slipping off due to the goggles' shape. Summary of the Invention

[0005] In view of this, in order to solve at least one of the above-mentioned technical problems, the present invention provides an eyepiece assembly, a night vision device, and a method for installing the eyepiece assembly.

[0006] To achieve the above objectives, the present invention mainly provides the following technical solutions: On one hand, the present invention provides an eyepiece assembly, the eyepiece assembly comprising: An eyepiece, comprising at least an eyepiece frame, wherein the eyepiece frame is provided with an annular groove and an annular protrusion; The eye mask has openings for ventilation. The goggle sleeve has a threaded hole, and the goggle sleeve is fitted inside the goggle, with the threaded hole corresponding to the through hole of the goggle. The eye mask pressure ring has a pressure ring through hole. The eye mask pressure ring is fitted over the eye mask, and the pressure ring through hole corresponds to the eye mask through hole. At least one screw is provided. The eyepiece frame is inserted into the eye mask sleeve. The annular protrusion slides against the eye mask pressure ring. The screw is inserted into the pressure ring through hole and the eye mask through hole and screwed into the threaded hole. The end of the screw is embedded in the annular groove.

[0007] The inner wall of the goggles has protruding buckles, and the goggles sleeve has slots that mate with the buckles, with the buckles fitting into the slots.

[0008] The pressure ring has a tapered hole, the screw is a tapered screw, and the screw nut is inserted into the pressure ring's through hole.

[0009] The eye mask sleeve and the eyepiece frame are fitted with a clearance fit between the hole and the shaft. The eye patch retainer and the eyepiece frame are fitted with a clearance fit. The screw should at least slide against the sidewall of the annular groove.

[0010] Lubricant is provided between the eye patch sleeve and the eyepiece frame, between the eye patch pressure ring and the eyepiece frame, and between the screw and the annular groove.

[0011] The eye mask pressure ring includes an outer cylinder and a pressure plate. The outer cylinder is fitted around the outer periphery of the eye mask and has a pressure ring through hole. The pressure plate is connected to the outer cylinder and extends toward the center of the outer cylinder. The pressure plate covers the end face of the eye mask, and the annular protrusion slides against the pressure plate.

[0012] The eye mask includes a through first end opening and a second end opening. The first end opening is used to abut against the periphery of the eye, and the eyepiece frame is inserted into the eye mask through the second end opening. The outline of the first opening matches the outline of the eye area; The goggles include an elastic region between the first and second end openings. The elastic region is designed to expand and contract under external force to change the distance between the first and second end openings.

[0013] On the other hand, the present invention also provides a night vision device, including the eyepiece assembly of any one of the above, and a night vision device body; The eyepiece frame is threadedly connected to the main body of the night vision device.

[0014] Furthermore, the present invention also provides a method for mounting an eyepiece assembly for any of the eyepiece assemblies described above, the method comprising: The goggle sleeve is nested inside the goggle, with the threaded hole of the goggle sleeve corresponding to the through hole of the goggle. The eye mask pressure ring is placed over the eye mask, and the pressure ring through hole corresponds to the eye mask through hole; Pass the screw through the pressure ring through hole and the goggle through hole, screw it into the threaded hole, and leave a certain amount of room for movement; The eye mask, eye mask sleeve, and eye mask pressure ring are fitted onto the eyepiece frame as a whole, and the annular protrusion of the eyepiece frame slides against the eye mask pressure ring. Screw the screw into the annular groove of the eyepiece frame.

[0015] The step of screwing the screw into the annular groove of the eyepiece frame includes: After tightening the screw, turn it back half a turn to make the screw fit the annular groove.

[0016] This invention proposes an eyepiece assembly, a night vision device, and an installation method for the eyepiece assembly. A screw is inserted through the pressure ring and eyepiece through the eyepiece, and then screwed into the threaded hole to fix the eyepiece, eyepiece sleeve, and eyepiece pressure ring. The screw end is embedded in an annular groove, and the annular protrusion slides against the eyepiece pressure ring, providing axial positioning of the eyepiece and eyepiece frame. The circumferential movement of the screw within the annular groove allows for convenient circumferential adjustment of the eyepiece frame and eyepiece, eliminating the need for disassembling and readjusting the eyepiece before reassembly. Simultaneously, the screw embedded in the annular groove ensures a stable connection between the eyepiece, eyepiece sleeve, and eyepiece pressure ring to the eyepiece frame, preventing the eyepiece from easily detaching. This improves the technical specifications of night vision optical instruments and optimizes human-machine interface. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a portion of the structure of an eyepiece assembly provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a portion of the eyepiece structure in an eyepiece assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an eyepiece sleeve in an eyepiece assembly provided by an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the eyepiece pressure ring in an eyepiece assembly provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the eyepiece frame in an eyepiece assembly provided by an embodiment of the present invention; Figure 6 This is a flowchart illustrating an eyepiece assembly installation method provided in an embodiment of the present invention.

[0018] Among them, eyepiece frame-100, annular groove-101, annular protrusion-102, eye mask-200, eye mask through hole-201, buckle-202, eye mask sleeve-300, threaded hole-301, slot hole-302, eye mask pressure ring-400, outer cylinder-410, pressure plate-420, pressure ring through hole-401, screw-500. Detailed Implementation

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present 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. Therefore, they should not be construed as limiting the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] like Figure 1-5 As shown, an embodiment of the present invention provides an eyepiece assembly, which includes: An eyepiece, comprising at least an eyepiece frame 100, wherein an annular groove 101 and an annular protrusion 102 are provided on the eyepiece frame 100; The blindfold 200 has a through hole 201. The eye mask sleeve 300 has a threaded hole 301. The eye mask sleeve 300 is fitted inside the eye mask 200, and the threaded hole 301 corresponds to the eye mask through hole 201. The eye mask pressure ring 400 has a pressure ring through hole 401. The eye mask pressure ring 400 is fitted over the eye mask 200, and the pressure ring through hole 401 corresponds to the eye mask through hole 201. At least one screw 500 is used. The eyepiece frame 100 is inserted into the eye mask sleeve 300. The annular protrusion 102 slides against the eye mask pressure ring 400. The screw 500 is inserted into the pressure ring through hole 401 and the eye mask through hole 201, and screwed into the threaded hole 301. The end of the screw 500 is embedded in the annular groove 101.

[0024] The eyepiece also includes optical components, such as a lens assembly. The eyepiece frame 100 is an approximately cylindrical structure, and the lens assembly is disposed within the eyepiece frame 100. The annular groove 101 is a groove formed on the outer wall of the eyepiece frame 100, running around its circumference. The annular protrusion 102 is a protrusion formed on the outer wall of the eyepiece frame 100, running around its circumference. The annular protrusion 102 and the annular groove 101 are spaced apart axially from each other in the eyepiece frame 100, and the annular protrusion 102 is located on the side of the annular groove 101 away from the eyepiece 200.

[0025] The eye mask 200 is an irregularly shaped structure with openings at both ends. For example, the eye mask 200 includes a through first opening and a second opening. The first opening is designed to fit against the periorbital area of ​​the eye, and its contour conforms to the contour of the periorbital area, forming an irregular, wavy structure to ensure a snug fit and prevent light leakage. The eyepiece is inserted into the eye mask 200 through the second opening. Light passes through the eyepiece, through the eye mask 200, and enters the eye through the first opening.

[0026] like Figure 3 As shown, the goggle sleeve 300 has a ring-shaped structure and is attached to the inner wall of the goggle 200, such as the inner wall adjacent to the edge of the second end opening. The goggle pressure ring 400 can be a similar ring-shaped structure to the goggle sleeve 300, or it can have a more complex shape, which will be further illustrated later. The goggle sleeve 300 and the goggle pressure ring 400 are respectively located on the inner and outer sides of the goggle 200, clamping a portion of the goggle 200 extending inward from the edge of the second end opening. In some embodiments, after the goggle sleeve 300 is installed, the end face of the goggle sleeve 300 and the edge of the second end opening are on the same plane.

[0027] The eye mask 200 can be made of a soft material, such as rubber, soft plastic, or silicone. The eye mask sleeve 300 and the eye mask pressure ring 400 are made of a material with a certain degree of rigidity that can provide positioning and support, such as plastic or metal.

[0028] The screw 500 can be a single screw or multiple screws, such as 4, 6, or 8 screws. The number and position of the pressure ring through-hole 401, the goggle mask through-hole 201, and the threaded hole 301 correspond. For example, with 6 screws 500, the goggle mask 200 has 6 goggle mask through-holes 201 evenly spaced around its circumference, the goggle mask sleeve 300 has 6 threaded holes 301 evenly spaced around its circumference, and the goggle mask pressure ring 400 has 6 pressure ring through-holes 401 evenly spaced around its circumference. After the screws 500 are installed, the goggle mask 200, the goggle mask pressure ring 400, and the goggle mask sleeve 300 are connected as a single unit.

[0029] During installation, the eyepiece frame 100 is inserted into the assembly connecting the eyecup 200, eyecup retainer 400, and eyecup sleeve 300 through the second end opening of the eyecup 200, with one end near the annular groove 101. When the annular protrusion 102 abuts against the eyecup retainer 400, the annular groove 101 aligns with the threaded hole 301, or screw 500. The screw 500 is then rotated inward, embedding a portion of its end into the annular groove 101. This engagement with the sidewall of the annular groove 101 prevents the eyecup 200 from detaching from the eyepiece frame 100, thus avoiding the problem of the eyecup 200 easily coming off. During adjustment, the eyepiece frame 100 rotates, and the screw 500 moves along the annular groove 101, preventing the eyecup 200 from rotating with the eyepiece frame 100. This ensures the eyecup 200 maintains a comfortable and secure fit around the eyes.

[0030] This invention discloses an installation method for an eyepiece assembly, a night vision device, and an eyepiece assembly. A screw is threaded through the pressure ring through-hole and the goggles through-hole, securing the goggles, goggles sleeve, and goggles pressure ring. The screw's end is embedded in an annular groove, and the annular protrusion slides against the goggles pressure ring, axially limiting the goggles and eyepiece frame. The circumferential movement of the screw within the annular groove allows for convenient circumferential adjustment of the eyepiece frame and goggles, eliminating the need for disassembling and readjusting the goggles before reassembly. Simultaneously, the screw's embedding in the annular groove ensures a stable connection between the goggles, goggles sleeve, and goggles pressure ring to the eyepiece frame, preventing the goggles from detaching. This improves the technical specifications of night vision optical instruments and optimizes human-machine interface.

[0031] In one implementation, such as Figure 2 As shown, the inner wall of the eye mask 200 is provided with a protruding buckle 202, and the eye mask sleeve 300 is provided with a slot 302 that cooperates with the buckle 202, and the buckle 202 is embedded in the slot 302.

[0032] The eye mask sleeve 300 is set inside the eye mask 200. The engagement of the buckle 202 and the slot 302 achieves the initial positioning of the eye mask sleeve 300 and the eye mask 200. On the one hand, when the buckle 202 and the slot 302 are engaged, the threaded hole 301 and the eye mask through hole 201 are aligned, making hole alignment convenient. On the other hand, the initial positioning prevents the eye mask sleeve 300 and the eye mask 200 from separating, which facilitates the subsequent installation of the eye mask pressure ring 400 without the need to manually fix the eye mask sleeve 300.

[0033] The buckle 202 and the slot 302 can have various mating shapes. For example, the buckle 202 can be a strip-shaped arc protrusion between adjacent goggle holes 201, and the slot 302 can be a strip-shaped arc groove or a through hole between adjacent threaded holes 301. If the slot 302 is a groove, it can ensure the structural strength of the goggle sleeve 300. If the slot 302 is a hole, it can increase the depth of the slot 302 and ensure the limiting strength. The design can be determined according to the material and thickness of the goggle sleeve 300.

[0034] In one implementation, such as Figure 4 As shown, the pressure ring through hole 401 is a tapered hole, and the screw 500 is a tapered head screw. The nut of the screw 500 is embedded in the pressure ring through hole 401.

[0035] After the screw 500 is installed, that is, after the end of the screw 500 is inserted into the annular groove 101, the nut of the screw 500 is inserted into the pressure ring through hole 401, making the outer circumference of the eye mask pressure ring 400 smooth. On the one hand, this avoids accidental contact with the screw 500, which could cause the screw 500 to loosen. On the other hand, it makes the appearance simple and beautiful, and avoids the screw 500 from scratching the user's hands.

[0036] In one embodiment, the machining tolerances are as follows: the eye mask sleeve 300 and the eyepiece frame 100 are fitted with a hole-shaft clearance fit, with a fit tolerance of H9 / h9. The eye mask pressure ring 400 and the eyepiece frame 100 are fitted with a hole-shaft clearance fit, with a fit tolerance of H9 / h9.

[0037] Clearance fit refers to a small gap between two parts, or the ability to slide against each other, allowing for relative movement. This enables the eyepiece frame 100 to rotate circumferentially relative to the eyecup sleeve 300 and eyecup pressure ring 400 under external force, such as a user's tightening force, without becoming too loose or wobbly. The screw 500 can slide against the side wall of the annular groove 101, and there can be a small gap between the screw 500 and the bottom wall of the annular groove 101 to prevent it from being tightened too much and thus preventing the eyepiece frame 100 from rotating.

[0038] In one embodiment, lubricant is provided between the eyecup sleeve 300 and the eyepiece frame 100, and between the eyecup pressure ring 400 and the eyepiece frame 100. Lubricant, such as grease, may also be provided between the screw 500 and the annular groove 101 to ensure smooth rotation of the eyepiece frame 100.

[0039] In one embodiment, the eye mask pressure ring 400 includes an outer cylinder 410 and a pressure plate 420. The outer cylinder 410 is sleeved on the outer periphery of the eye mask 200. The outer cylinder 410 is provided with a pressure ring through hole 401. The pressure plate 420 is connected to the outer cylinder 410 and extends toward the center of the outer cylinder 410, such as extending perpendicularly to the axis. The pressure plate 420 covers the end face of the eye mask 200, and the annular protrusion 102 slides against the pressure plate 420.

[0040] The outer cylinder 410 has a cylindrical structure, and the pressure plate 420 is an annular plate extending inward from the edge of the outer cylinder 410, with the extension direction of the pressure plate 420 perpendicular to that of the outer cylinder 410. The outer cylinder 410 is used to cooperate with the goggle sleeve 300 to clamp a portion of the goggle 200 extending inward from the second end opening, while the pressure plate 420 covers the end face of the goggle 200 from the second end opening and extends to cover the goggle sleeve 300, and has a clearance fit with the side wall of the eyepiece frame 100 via a axial hole. Thus, firstly, because the eyecup 200 is elastic, the clearance fit between the pressure plate 420 and the side wall shaft hole of the eyepiece frame 100 fixes the distance between the outer cylinder 410 of the eyecup pressure ring 400 and the eyepiece frame 100, thereby avoiding the problem of the screw 500 easily loosening due to changes in the position of the outer cylinder 410, increasing the stability of the structure and the connection. Secondly, the clearance fit between the pressure plate 420 and the shaft hole of the eyepiece frame 100 achieves radial limitation of the eyepiece frame 100, reducing the relative wobbling of the eyepiece frame 100 and the eyecup 200 in the radial direction. Thirdly, the cooperation between the pressure plate 420 and the annular protrusion 102 seals the connection between the outer cylinder 410 and the eyecup 200, and the connection between the eyecup 200 and the eyecup sleeve 300, reducing the risk of dust entering the exposed connection points and causing transmission problems, and also reducing the leakage of lubricating oil.

[0041] In one embodiment, the goggles 200 include an elastic region between a first end opening and a second end opening, the elastic region being able to expand and contract under external force to change the distance between the first end opening and the second end opening.

[0042] The elastic area may include multiple folds arranged in parallel, which in turn form an approximate corrugated tube shape, providing a certain adjustment margin for the orientation of the first end opening and increasing versatility.

[0043] On the other hand, the present invention also provides a night vision device, including an eyepiece assembly of any of the above, and a night vision device body, wherein the eyepiece frame 100 is threadedly connected to the night vision device body.

[0044] The main body of the night vision device is the main structure of the night vision device. The night vision device usually also includes an objective lens, which is located at the front end of the night vision device main body. The eyepiece assembly is located at the end of the night vision device main body, and the eyepiece frame 100 is threadedly connected to the night vision device main body. The axial movement of the eyepiece assembly can be achieved by rotating the eyepiece frame 100.

[0045] The night vision device includes the eyepiece assembly of any of the foregoing claims, and the advantages of including the eyepiece assembly of any of the foregoing claims will not be elaborated here.

[0046] On the other hand, such as Figure 6 As shown, the present invention also provides a method for installing an eyepiece assembly for any of the eyepiece assemblies described above, the method comprising: S1. The blind sleeve 300 is nested in the blind 200, and the threaded hole 301 of the blind sleeve 300 corresponds to the blind through hole 201 of the blind 200.

[0047] In an embodiment including the buckle 202 and the slot 302, the goggle sleeve 300 is inserted into the goggle 200 through the second end opening of the goggle 200, and adjusted so that the buckle 202 is embedded in the slot 302, thereby aligning the threaded hole 301 with the goggle through hole 201.

[0048] S2. The eye mask pressure ring 400 is fitted over the eye mask 200, and the pressure ring through hole 401 of the eye mask pressure ring 400 corresponds to the eye mask through hole 201.

[0049] In an embodiment where the eye mask pressure ring 400 includes an outer cylinder 410 and a pressure plate 420, the outer cylinder 410 is fitted onto the eye mask 200 from the side of the second end opening of the eye mask 200 until the pressure plate 420 abuts against the edge of the second end opening of the eye mask 200. The eye mask pressure ring 400 is then adjusted so that the pressure ring through hole 401 corresponds to the eye mask through hole 201.

[0050] S3. Pass the screw 500 through the pressure ring through hole 401 and the eye mask through hole 201, and screw it into the threaded hole 301, while maintaining a certain amount of room for movement.

[0051] That is, screw 500 does not need to be tightened, only screwed into the threaded hole 301, to ensure that the eye mask 200, eye mask sleeve 300 and eye mask pressure ring 400 are a whole, and the end of screw 500 will not protrude into the inner wall of eye mask sleeve 300, so as to avoid obstructing the eyepiece frame 100 from being inserted.

[0052] S4. The eye mask 200, eye mask sleeve 300 and eye mask pressure ring 400 are fitted onto the eyepiece frame 100 as a whole, and the annular protrusion 102 of the eyepiece frame 100 slides and abuts against the eye mask pressure ring 400.

[0053] The eye mask 200, eye mask sleeve 300 and eye mask pressure ring 400 are fitted onto the outer periphery of the eyepiece frame 100 from the side of the eyepiece frame 100 near the annular groove 101, until the pressure plate 420 of the eye mask pressure ring 400 abuts against the annular protrusion 102. At this time, the screw 500 is aligned with the annular groove 101.

[0054] S5. Screw 500 into the annular groove 101 of the eyepiece frame 100.

[0055] One approach is to tighten screw 500 and then turn it back half a turn to create a clearance fit between screw 500 and annular groove 101. Specifically, when screw 500 is tightened until its end abuts against annular groove 101, it is then turned back half a turn, creating a certain gap or sliding contact between the end of screw 500 and the bottom of annular groove 101. This prevents eyepiece frame 100 from being squeezed and immobilized by screw 500, allowing circumferential movement of eyepiece frame 100, while axial positioning is achieved through screw 500.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An eyepiece assembly, comprising: include: An eyepiece, the eyepiece comprising at least an eyepiece frame (100), the eyepiece frame (100) having an annular groove (101) and an annular protrusion (102). An eye mask (200) is provided with an eye mask through hole (201); An eye mask sleeve (300) is provided with a threaded hole (301). The eye mask sleeve (300) is fitted inside the eye mask (200). The threaded hole (301) corresponds to the through hole (201) of the eye mask. An eye mask pressure ring (400) is provided with a pressure ring through hole (401). The eye mask pressure ring (400) is fitted over the eye mask (200), and the pressure ring through hole (401) corresponds to the eye mask through hole (201). At least one screw (500) is provided, the eyepiece frame (100) is inserted into the eye mask sleeve (300), the annular protrusion (102) slides against the eye mask pressure ring (400), the screw (500) is inserted into the pressure ring through hole (401) and the eye mask through hole (201), and screwed into the threaded hole (301), the end of the screw (500) is embedded in the annular groove (101).

2. The eyepiece assembly according to claim 1, characterized in that, The inner wall of the goggles (200) is provided with a protruding buckle (202), and the goggles sleeve (300) is provided with a slot (302) that cooperates with the buckle (202), and the buckle (202) is embedded in the slot (302).

3. The eyepiece assembly according to claim 1, characterized in that, The pressure ring through hole (401) is a tapered hole, the screw (500) is a tapered screw, and the nut of the screw (500) is embedded in the pressure ring through hole (401).

4. The eyepiece assembly according to claim 1, characterized in that, The eye mask sleeve (300) and the eyepiece frame (100) are fitted with a hole-axis clearance fit; The eye mask pressure ring (400) and the eyepiece frame (100) are fitted with a hole-axis clearance fit; The screw (500) slides against at least the sidewall of the annular groove (101).

5. The eyepiece assembly according to claim 1, characterized in that, Lubricant is provided between the eye mask sleeve (300) and the eyepiece frame (100), between the eye mask pressure ring (400) and the eyepiece frame (100), and between the screw (500) and the annular groove (101).

6. The eyepiece assembly according to claim 1, characterized in that, The eye mask pressure ring (400) includes an outer cylinder (410) and a pressure plate (420). The outer cylinder (410) is fitted around the outer periphery of the eye mask (200). The outer cylinder (410) is provided with the pressure ring through hole (401). The pressure plate (420) is connected to the outer cylinder (410) and extends toward the center of the outer cylinder (410). The pressure plate (420) covers the end face of the eye mask (200). The annular protrusion (102) slides against the pressure plate (420).

7. The eyepiece assembly according to claim 1, characterized in that, The eye mask (200) includes a through first end opening and a second end opening. The first end opening is used to abut against the periorbital area of ​​the eye, and the eyepiece frame (100) is inserted into the eye mask (200) through the second end opening. The outline of the first opening matches the outline of the eye area; The goggles (200) include an elastic region between the first end opening and the second end opening, the elastic region being designed to expand and contract under external force to change the distance between the first end opening and the second end opening.

8. A night vision device, characterized by Includes the eyepiece assembly as described in any one of claims 1-7, and the night vision device body; The eyepiece frame (100) is threadedly connected to the night vision device body.

9. A method for installing an eyepiece assembly, characterized in that, For an eyepiece assembly as described in any one of claims 1-7, the method comprises: An eye mask sleeve (300) is nested inside an eye mask (200), and the threaded hole (301) of the eye mask sleeve (300) corresponds to the eye mask through hole (201) of the eye mask (200); The eye mask pressure ring (400) is fitted over the eye mask (200), and the pressure ring through hole (401) of the eye mask pressure ring (400) corresponds to the eye mask through hole (201); Pass the screw (500) through the pressure ring through hole (401) and the goggle through hole (201), screw it into the threaded hole (301), and keep a certain amount of room for movement; The eye mask (200), the eye mask sleeve (300) and the eye mask pressure ring (400) are fitted onto the eyepiece frame (100) as a whole, and the annular protrusion of the eyepiece frame (100) slides against the eye mask pressure ring (400); The screw (500) is screwed into the annular groove (101) of the eyepiece frame (100).

10. The method for installing the eyepiece assembly according to claim 9, characterized in that, The step of screwing the screw (500) into the annular groove (101) of the eyepiece frame (100) includes: After tightening the screw (500), turn it back half a turn so that the screw (500) and the annular groove (101) are in clearance fit.

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