Four-eye night vision device

Abstract

The invention belongs to the technical field of night vision devices, and particularly discloses a four-eye night vision device. Two image intensifiers are arranged in a main lens frame of the four-eye night vision device, a circuit board is arranged between the two image intensifiers, two objective lenses are fixed to the object side of a lens body, an ocular lens is connected to the image side of the lens body, two ocular lens sets are arranged in an ocular lens frame, and an ocular lens clamping sleeve is fixed to the image side of the ocular lens frame; the objective lens seat extends into the main lens frame and abuts against the image intensifier, the objective lens group is in threaded connection with the objective lens seat, the objective lens pressing ring is in threaded connection with the main lens frame and abuts against the objective lens seat, the focusing hand wheel is fixed on the objective lens group, a flange plate is arranged on the image side of the objective lens seat, the image side of the objective lens pressing ring abuts against the flange plate, and a sealing ring I is arranged between the image side of the objective lens pressing ring and the flange plate. The objective lens pressing ring abuts against the flange plate of the objective lens seat and is in threaded connection with the main lens frame, and the objective lens group is in threaded connection with the objective lens seat, so that the objective lens is convenient to connect and adjust, and the device has the characteristics of compact structure, light weight, convenience in installation, reliability in connection and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of night vision devices, and in particular to a four-eye night vision device with compact structure, low weight, convenient installation, reliable connection and low cost. Background Art

[0002] Night vision goggles are night sights with image intensifiers as their core components. With the advancement of science and technology, night vision goggles have gradually developed from the initial monocular to the modern quadrilateral. Among them, monocular night vision goggles use an image intensifier and corresponding objective lens and eyepiece, so they are simple, portable and low-cost, but because of the limited field of view and depth perception, they are currently commonly used for leisure observation, reconnaissance and simple navigation. Binocular night vision goggles use two image intensifiers and two objective lenses and eyepieces, which can provide an independent field of view for each eye, so the observation is more natural and the depth perception is more accurate. Although the field of view is still subject to certain restrictions and the cost is controllable, it is currently popular in outdoor adventures, long-term observations and certain professional tasks. Since quadrilateral night vision goggles are equivalent to integrating four sets of monocular night vision goggles, they can provide a 120-degree observation field of view that is basically equivalent to the natural field of view of the human eye, thereby avoiding the problem of limited field of view of monocular and binocular lenses in the past, so they are gradually being used in search and rescue, counter-terrorism and special operations.

[0003] Since the four-eye night vision device is equivalent to integrating four sets of monocular night vision devices, the structure is more complicated, which also leads to a heavier overall weight and higher cost. In order to be able to be used flexibly, it is necessary to reduce the weight and the difficulty of assembly and debugging by improving the design, thereby reducing the burden of use and production. However, the existing four-eye night vision devices are mostly simple integrations of various monocular night vision devices, and more are optimization and improvement of image stitching quality. Although lightweight materials are also used to reduce weight, the optical system still mostly adopts traditional design, which not only leads to a large number of lenses and a large lens volume, resulting in a large proportion of the optical system in the overall weight, but also makes the four-eye night vision device larger in size, and the correction of various aberrations is also more difficult; and the main mirror body is mostly a simple integration of a monocular structure, and due to limited space, the effect of reducing weight is limited, and assembly and later debugging are also more complicated and cumbersome. To this end, in the prior art, a special-shaped spring clip bracket is fixed in the middle of the rear part of the main mirror body, and conductive spring clips are respectively fixed on the spring clip bracket at the positive and negative electrode positions corresponding to the image intensifier, so that the positive and negative electrodes of the image intensifier loaded into the binocular lens barrel shell are elastically abutted against the conductive spring clips on the spring clip bracket, so that reliable positioning of the image intensifier after being loaded into the binocular lens barrel shell can be ensured, and a reliable electrical connection can be formed; however, since the spring clip bracket is a special-shaped structure, it is not only cumbersome and costly to manufacture, but also relies on the skills of workers to accurately position and fix the spring clip bracket in the binocular lens barrel shell, and it is also difficult to replace or debug the conductive spring clip after it fails. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a four-eye night vision device with compact structure, low weight, convenient installation, reliable connection and low cost.

[0005] The present invention is implemented as follows: it comprises an objective lens, a main lens body, and an eyepiece, wherein the main lens body comprises a main lens frame of a V-shaped structure, wherein the main lens frame has two image intensifiers built therein and a circuit board is arranged between the image intensifiers, two objective lenses are detachably fixed on the object side of the main lens body, and an eyepiece is detachably arranged on the image side of the main lens body; The eyepiece comprises an eyepiece frame detachably connected to the image side of the main mirror body, two sets of eyepiece lens groups are arranged in the eyepiece frame, and an eyepiece ferrule is fixed to one end of the eyepiece frame away from the main mirror body; The objective lens comprises an objective lens seat which is slidably extended into the main lens frame and abuts against the image intensifier, an objective lens group which is threadedly connected on the image side and extends into the objective lens seat, an objective lens pressure ring which is threadedly connected and extends into the main lens frame and abuts against the objective lens seat, and a focusing hand wheel which is fixedly sleeved on the objective lens group, a flange is arranged on the image side of the objective lens seat, and the image side of the objective lens pressure ring abuts against the flange with a sealing ring I arranged therebetween.

[0006] Furthermore, the objective lens group includes an objective lens barrel, an objective lens group, a front pressure ring detachably fixedly arranged on the object side of the objective lens barrel and abutting against the objective lens group, a lens frame for fixing the objective lens, and objective lens spacers I, II, and III for separating the objective lenses; The objective lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence along the optical path from the object side to the image side at intervals. The objective lens barrel is a four-step hollow shaft whose diameter decreases in sequence from the object side to the image side. The second lens, the third lens and the fourth lens form a first cemented lens, and the fifth lens and the sixth lens form a second cemented lens. The second cemented lens is fixedly sleeved in the lens frame and is arranged in the second step hole on the image side of the objective lens barrel through the objective lens spacer ring III. The first cemented lens is slidably arranged in the second step hole on the object side of the objective lens barrel and abuts against the lens frame through the objective lens spacer ring II. The first lens is slidably arranged in the first step hole on the object side of the objective lens barrel and abuts against the first cemented lens through the objective lens spacer ring I. The image side of the front pressure ring abuts against the first lens.

[0007] Furthermore, the first lens, the second lens and the fifth lens are all meniscus lenses with a convex object side, the third lens and the sixth lens are all double convex lenses, the fourth lens is a double concave lens, and the seventh lens is a single concave lens with a concave object side and a flat image side; the first lens is a positive refractive power objective lens, the first cemented lens is a negative refractive power objective lens, the second cemented lens is a positive refractive power objective lens, and the seventh lens is a negative refractive power objective lens.

[0008] Furthermore, the objective lens seat is a two-step hollow shaft with a diameter decreasing from the object side to the image side, the flange is coaxially fixed on the image side end face of the objective lens seat, the image side step outer cylindrical surface of the objective lens barrel is threadedly connected and extends into the image side step hole of the objective lens seat, one of the step outer cylindrical surfaces of the objective lens barrel movably extends into the object side step hole of the objective lens seat and a sealing ring II is sleeved on the step outer cylindrical surface; the image side sliding sleeve of the focusing handwheel is provided with a retaining ring group, the retaining ring group includes an open retaining ring, screws I connecting the two sides of the retaining ring opening, and guide pins vertically fixed on the image side of the retaining ring, the retaining ring sliding sleeve is provided on the focusing handwheel, and a guide hole is correspondingly provided on the object side of the objective lens pressure ring, and the guide pin slides and extends into the guide hole of the objective lens pressure ring.

[0009] Furthermore, connecting cavities are provided on the left and right sides of the interior of the main lens frame, and the two image intensifiers are respectively slidably arranged in the two connecting cavities of the main lens frame. The two connecting cavities inside the main lens frame are interconnected, and the upper wall and the lower wall are respectively provided with corresponding card slots. The circuit board is vertically arranged and the upper and lower ends are respectively pluggable and arranged in the card slots of the upper wall and the lower wall of the main lens frame. Two conductive spring sheets are fixed on the two side surfaces of the circuit board at an upper and lower interval, and the conductive spring sheets on both sides of the circuit board are respectively elastically abutted against the positive and negative electrodes of the two image intensifiers, and the upper wall of the main lens frame is penetrated by a conductive pin electrically connected to the conductive spring sheets on the circuit board.

[0010] Furthermore, the conductive spring pieces on the side of the circuit board are arranged on the upper and lower sides of the horizontal plane corresponding to the center of the image intensifier, and the conductive spring pieces include a plate-shaped connecting portion and a bending portion, the connecting portion is fixedly fitted to the side of the circuit board, and the bending portion protrudes from the surface of the circuit board and can elastically abut against the electrode of the image intensifier; the image end of the bending portion is connected to the connecting portion and the object end is suspended, the cross-section of the bending portion is a "V"-shaped structure with an opening facing the circuit board and the top end corresponds to the electrode position of the image intensifier, and the orthographic projection of the suspended end of the bending portion on the side of the circuit board is within the range of the connecting portion.

[0011] Furthermore, the upper and lower conductive spring sheets on one side of the circuit board can be elastically abutted against the positive and negative electrodes of the corresponding image intensifier, respectively, and the upper and lower conductive spring sheets on the other side can be elastically abutted against the negative and positive electrodes of the corresponding image intensifier, respectively. The conductive spring sheets on both sides of the circuit board that elastically abut against the positive electrode are electrically connected to each other and the conductive spring sheets that elastically abut against the negative electrode are electrically connected to each other, and the positive and negative conductive spring sheets of the circuit board are electrically connected to the corresponding positive and negative conductive pins, respectively.

[0012] Furthermore, a conductive strip I is vertically fixed on each side surface of the circuit board, the upper ends of the two conductive strips I are electrically connected to the conductive spring sheets on the same side, and the two conductive strips I pass through the circuit board near the lower conductive spring sheets and are electrically connected to the conductive spring sheets at the lower part of the other side; a conductive strip II is also horizontally fixed on each side surface of the circuit board and extends to the image side end surface close to the circuit board, one end of the conductive strip II is electrically connected to the conductive strip I on the same side and the other end is electrically connected to the corresponding conductive pin.

[0013] Furthermore, the circuit board mounted in the card slot of the main lens frame extends toward the image side and a connecting plate is horizontally fixed on the top. Two crown spring terminals matching with the conductive pins are arranged on the upper surface of the connecting plate at intervals. The two crown spring terminals are electrically connected to the corresponding positive and negative conductive spring sheets respectively.

[0014] Furthermore, the portion of the connecting cavity close to the object side is a columnar structure and slides into the object side portion of the built-in image intensifier, the middle portion of the connecting cavity and the side wall on the image side away from the circuit board are arc surfaces that can fit the outer circular surface of the image intensifier, and the electrodes of the image intensifier are arranged close to the image side.

[0015] Beneficial effects of the present invention: 1. The present invention threadably connects the objective lens pressing ring to the main lens frame so that the pressing ring abuts against the flange of the objective lens seat, thereby simplifying the connection between the objective lens and the main lens frame, effectively simplifying the connection structure to reduce weight and volume while ensuring connection reliability, and facilitating adjustment of the focal length of the objective lens; and by sliding the objective lens seat into the main lens frame and abutting against the image intensifier, the objective lens group is threadably extended from the object side into the objective lens seat, and a threadably connected objective lens pressing ring extending into the main lens frame and abutting against the objective lens seat is provided, as well as a focusing hand wheel fixedly sleeved on the objective lens group, so that the objective lens group can be driven by the focusing hand wheel to axially move in the objective lens seat to achieve zooming, and the focusing structure is effectively simplified.

[0016] 2. The objective lens group of the present invention adopts seven lenses with a specific structure. Through the specific optical power distribution and combination of the seven lenses, not only can the spherical aberration, field curvature, distortion, chromatic aberration and secondary spectral chromatic aberration of the objective optical system be optimized, but also the weight and size of the objective lens can be reduced, thereby ensuring that the night vision device has good aberration, compact structure and low weight; and the second, third and fourth lenses in the objective lens group are composed of a first cemented lens, and the fifth and sixth lenses are composed of a second cemented lens, which can not only significantly shorten the size of the objective lens group, but also reduce the number of spacers to reduce the overall weight, and can also reduce the workload of optical adjustment and correct the chromatic aberration of the objective lens group.

[0017] 3. The present invention provides two interconnected connecting cavities in the main lens frame to accommodate the image intensifier, and correspondingly provides card slots for inserting the circuit board on the upper wall and the lower wall of the main lens frame between the connecting cavities, and upper and lower conductive springs elastically abutting against the positive and negative electrodes of the image intensifier are fixed on both side surfaces of the circuit board, respectively. Thus, the image intensifier can be slidably installed through the connecting cavity, and the circuit board can be plugged in and out through the card slot, which effectively simplifies the assembly and debugging of the image intensifier and the circuit board, avoids the deficiency that the assembly accuracy depends on the skills of the workers, and the electrodes of the image intensifier after installation elastically abut against the conductive springs on the circuit board, which can also ensure that a stable and reliable electrical connection is formed after assembly.

[0018] 4. The present invention is based on the structural characteristics of the main mirror body of the four-eye night vision device. The two connecting cavities in the main mirror frame are interconnected through optimized design, and slots are respectively provided on the upper and lower walls of the main mirror frame to plug and unplug the plate-shaped circuit board. This can not only simplify the structure of the main mirror frame and the circuit board and reduce the process cost, but also effectively reduce the weight of the structure and reduce the burden of use while ensuring a reliable connection after assembly.

[0019] 5. The image intensifier of the present invention forms a micro-floating connection structure through the connection cavity of the main lens frame and the conductive spring sheet on the circuit board, which can effectively reduce the impact of the night vision device on the image intensifier due to violent shaking and bumping, thereby improving the stability and service life of the image intensifier. In addition, the elastic contact between the conductive spring sheet and the electrode can not only ensure the reliability of the electrical connection after long-term use, but also effectively reduce the difficulty of electrical connection of the image intensifier. In summary, the present invention has the characteristics of compact structure, low weight, convenient installation, reliable connection and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 Exploded view of; Figure 3 for Figure 1 A cross-sectional view of Figure 4 It is a schematic diagram of the three-dimensional structure of the objective lens assembly and the objective lens seat of the present invention; Figure 5 for Figure 4 A cross-sectional view of Figure 6 It is a schematic diagram of the three-dimensional structure of the objective lens pressure ring of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the main mirror body of the present invention; Figure 8 It is an exploded view of the main mirror body of the present invention; Fig. 9 It is a side view of the main mirror image of the present invention; Fig.10 for Fig. 9 AA section view; Fig.11 It is a schematic diagram of the circuit board structure of the present invention; Fig.12 for Fig.11 The upper right top view of In the figure: 100-objective lens, 110-objective lens seat, 111-flange, 120-objective lens group, 121-objective lens barrel, 122-objective lens group, 122A-first lens, 122B-second lens, 122C-third lens, 122D-fourth lens, 122E-fifth lens, 122F-sixth lens, 122G-seventh lens, 123-front pressure ring, 124-lens frame, 125-objective lens spacer I, 126-objective lens spacer II, 127-objective lens spacer III, 130-objective lens pressure ring, 140-focusing hand wheel, 150-sealing ring I, 160-decorative ring, 170-sealing ring Ⅱ, 180-sealing ring III, 190-retaining ring group, 191-retaining ring, 192-screw I, 193-guide pin, 200-main mirror body, 210-main mirror frame, 211-connecting cavity, 212-card slot, 213-dovetail groove, 220-image intensifier, 221-electrode, 230-circuit board, 231-conductive spring, 231A-connecting part, 231B-bending part, 232-conductive strip I, 233-conductive strip II, 234-connecting plate, 235-crown spring terminal, 240-conductive pin, 300-eyepiece, 310-eyepiece frame, 320-eyepiece lens group, 330-eyepiece sleeve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] like Figures 1 to 12 As shown, the present invention comprises an objective lens 100, a main lens body 200, and an eyepiece 300. The main lens body 200 comprises a main lens frame 210 of a V-shaped structure. The main lens frame 210 has two built-in image intensifiers 220 and a circuit board 230 is arranged between the image intensifiers 220. The object side of the main lens body 200 is detachably fixed with two objective lenses 100, and the image side of the main lens body 200 is detachably provided with an eyepiece 300. The eyepiece 300 includes an eyepiece frame 310 detachably connected to the image side of the main mirror body 200, two sets of eyepiece lens groups 320 are arranged in the eyepiece frame 310, and an eyepiece ferrule 330 is fixed to one end of the eyepiece frame 310 away from the main mirror body 200; The objective lens 100 includes an objective lens seat 110 that slides and extends into the main lens frame 210 and abuts the image intensifier 220, an objective lens group 120 that is threadedly connected to the image side and extends into the objective lens seat 110, an objective lens pressure ring 130 that is threadedly connected and extends into the main lens frame 210 and abuts the objective lens seat 110, and a focusing hand wheel 140 fixedly mounted on the objective lens group 120. A flange 111 is provided on the image side of the objective lens seat 110, and the image side of the objective lens pressure ring 130 abuts against the flange 111 with a sealing ring I 150 provided therebetween.

[0023] The objective lens group 120 includes an objective lens barrel 121, an objective lens group 122, a front pressure ring 123 detachably fixedly arranged on the object side of the objective lens barrel 121 and abutting against the objective lens group 122, a lens frame 124 for fixing the objective lens, and objective lens spacers I 125, II 126, and III 127 for separating the objective lenses; The objective lens group 122 is provided with a first lens 122A, a second lens 122B, a third lens 122C, a fourth lens 122D, a fifth lens 122E, a sixth lens 122F, and a seventh lens 122G in sequence along the optical path from the object side to the image side. The objective lens barrel 121 is a four-step hollow shaft with a diameter decreasing in sequence from the object side to the image side. The second lens 122B, the third lens 122C and the fourth lens 122D form a first cemented lens, and the fifth lens 122E and the sixth lens 122F form a second cemented lens. The second cemented lens is fixedly mounted in the lens frame 124 and the seventh lens 122G is arranged in the second step hole on the image side of the objective lens barrel 121 through the objective lens spacer ring III 127. The first cemented lens is slidably arranged in the second step hole on the object side of the objective lens barrel 121 and abuts against the lens frame 124 through the objective lens spacer ring II 126. The first lens 122A is slidably arranged in the first step hole on the object side of the objective lens barrel 121 and abuts against the first cemented lens through the objective lens spacer ring I 125. The image side of the front pressure ring 123 abuts against the first lens 122A.

[0024] The first lens 122A, the second lens 122B and the fifth lens 122E are all meniscus lenses with a convex surface on the object side, the third lens 122C and the sixth lens 122F are all double convex lenses, the fourth lens 122D is a double concave lens, and the seventh lens 122G is a single concave lens with a concave surface on the object side and a flat surface on the image side; the first lens 122A is a positive refractive power objective lens, the first cemented lens is a negative refractive power objective lens, the second cemented lens is a positive refractive power objective lens, and the seventh lens 122G is a negative refractive power objective lens.

[0025] The object side opening of the objective lens barrel 121 is provided with a threaded hole I, the front pressure ring 123 is threadedly connected and embedded in the threaded hole I of the objective lens barrel 121 and abuts against the first lens 122A, a sealing ring III 180 is provided between the front pressure ring 123 and the first lens 122A, and a decorative ring 160 is also sleeved on the outer circumferential surface of the object side of the objective lens barrel 121.

[0026] The objective lens holder 110 is a two-step hollow shaft with a diameter decreasing from the object side to the image side. The flange 111 is coaxially fixedly arranged on the image side end surface of the objective lens holder 110. The image side step outer circumferential surface of the objective lens barrel 121 is threadedly connected and extends into the image side step hole of the objective lens holder 110. One of the step outer circumferential surfaces of the objective lens barrel 121 is movably extended into the object side step hole of the objective lens holder 110 and a sealing ring II 170 is sleeved on the step outer circumferential surface. The image side sliding sleeve of the focusing hand wheel 140 is provided with a retaining ring group 190, and the retaining ring group 190 includes an open retaining ring 191, screws Ⅰ192 connecting the two sides of the opening of the retaining ring 191, and a guide pin 193 vertically fixed on the image side of the retaining ring 191. The retaining ring 191 is slidably sleeved on the focusing hand wheel 140, and a guide hole is correspondingly provided on the object side of the objective lens pressure ring 130, and the guide pin 193 slides and extends into the guide hole of the objective lens pressure ring 130.

[0027] The retaining ring 191, the main lens frame 210, the objective lens barrel 121 and the eyepiece lens frame 310 are made of aluminum alloy or glass fiber reinforced nylon material, and each spacer and the lens frame 124, the focusing hand wheel 140, the decorative ring 160 and the eyepiece ferrule 330 are made of engineering plastics or glass fiber reinforced nylon material.

[0028] Each lens in the objective lens group 122 is made of lightweight environmentally friendly glass material and coated with an anti-reflection film in the visible light to near infrared band.

[0029] like Figures 7 to 12 As shown, connecting cavities 211 are provided on the left and right sides of the interior of the main lens frame 210, and the two image intensifiers 220 are respectively slidably arranged in the two connecting cavities 211 of the main lens frame 210. The two connecting cavities 211 inside the main lens frame 210 are interconnected, and the upper wall and the lower wall are respectively provided with card slots 212. The circuit board 230 is vertically arranged and the upper and lower ends are respectively pluggable and arranged in the card slots 212 on the upper wall and the lower wall of the main lens frame 210. Two conductive springs 231 are fixed on the two side surfaces of the circuit board 230 at intervals, and the conductive springs 231 on both sides of the circuit board 230 are respectively elastically abutted against the positive and negative electrodes of the two image intensifiers 220. The upper wall of the main lens frame 210 is penetrated by a conductive pin 240 electrically connected to the conductive spring 231 on the circuit board 230.

[0030] The conductive spring pieces 231 on the side of the circuit board 230 are arranged at the upper and lower sides of the central horizontal plane corresponding to the image intensifier 220. The conductive spring pieces 231 include a plate-shaped connecting portion 231A and a bending portion 231B. The connecting portion 231A is fixedly fitted to the side of the circuit board 230, and the bending portion 231B protrudes from the surface of the circuit board 230 and can elastically abut against the electrode 221 of the image intensifier 220; the image end of the bending portion 231B is connected to the connecting portion 231A and the object end is suspended. The cross section of the bending portion 231B is a "V"-shaped structure with an opening facing the circuit board 230 and the top end corresponds to the position of the electrode 221 of the image intensifier 220. The orthographic projection of the suspended end of the bending portion 231B on the side of the circuit board 230 is within the range of the connecting portion 231A.

[0031] The upper and lower conductive spring sheets 231 on one side of the circuit board 230 can be elastically abutted against the positive and negative electrodes of the corresponding image intensifier 220, respectively, and the upper and lower conductive spring sheets 231 on the other side can be elastically abutted against the negative and positive electrodes of the corresponding image intensifier 220, respectively. The conductive spring sheets 231 elastically abutting against the positive electrodes on both sides of the circuit board 230 are electrically connected to each other and the conductive spring sheets 231 elastically abutting against the negative electrodes are electrically connected to each other. The positive and negative conductive spring sheets 231 of the circuit board 230 are electrically connected to the corresponding positive and negative conductive pins 240, respectively.

[0032] A conductive strip I232 is vertically fixed on each side of the circuit board 230, and the upper ends of the two conductive strips I232 are electrically connected to the conductive spring sheet 231 on the same side, and the two conductive strips I232 pass through the circuit board 230 near the lower conductive spring sheet 231 and are electrically connected to the conductive spring sheet 231 at the lower part of the other side; a conductive strip II233 is also horizontally fixed on each side of the circuit board 230 and extends to the image side end face close to the circuit board 230, and one end of the conductive strip II233 is electrically connected to the conductive strip I232 on the same side and the other end is electrically connected to the corresponding conductive pin 240.

[0033] Grooves are vertically and / or horizontally arranged on both side surfaces of the circuit board 230 , and the conductive strip I 232 and / or the conductive strip II 233 are fixedly arranged in the corresponding grooves with the top surface not higher than the side surface of the circuit board 230 .

[0034] The circuit board 230 mounted in the slot 212 of the main lens frame 210 extends toward the image side and has a connecting plate 234 fixed horizontally on the top. Two crown spring terminals 235 matching the conductive pins 240 are arranged on the upper surface of the connecting plate 234 at intervals. The two crown spring terminals 235 are electrically connected to the corresponding positive and negative conductive spring sheets 231, respectively.

[0035] The card slot 212 is a "U"-shaped or "V"-shaped groove. The card slot 212 on the upper wall of the main lens frame 210 is a stepped groove, and the groove depth on the object side is less than that on the image side. The upper end of the circuit board 230 is a stepped surface corresponding to the card slot 212 on the upper wall of the main lens frame 210, and the length of the upper end surface of the circuit board 230 on the object side is less than the length of the card slot 212 on the object side of the upper wall of the main lens frame 210.

[0036] The part of the connection cavity 211 close to the object side has a columnar structure and slidably houses the object-side part of the image intensifier 220. The middle part of the connection cavity 211 and the side wall on the image side far from the circuit board 230 are arc surfaces that can fit the outer circular surface of the image intensifier 220. The electrode 221 of the image intensifier 220 is arranged close to the image side.

[0037] The working principle and process of the present invention: As Figures 1 to 12 shown, when in use, light enters from the object side of the first lens 122A, is refracted successively by the first cemented lens, the second cemented lens and the seventh lens 122G, enters the image intensifier 220 from the image side of the seventh lens 122G. The image intensifier 220 amplifies the image signal and displays it at the rear side, and finally is received by the human eye through the eyepiece 300.

[0038] When it is necessary to adjust the focal length, rotate the focusing handwheel 140 to drive the objective lens barrel 121 to rotate within the objective lens base 110. Since the objective lens base 110 is fixedly connected to the main lens frame 210 through the objective lens retaining ring 130, the focusing handwheel 140 and the objective lens barrel 121, together with the objective lens group 122 fixedly arranged therein, move forward or backward relative to the main lens frame 210, so that the focal length of the incident image intensifier 220 changes to achieve zooming. During the forward or backward movement of the focusing handwheel 140, since the retaining ring group 190 is slidably arranged on the image side of the focusing handwheel 140 and is connected to the objective lens retaining ring 130 through the guide pin 193, the focusing handwheel 140 is blocked by the retaining ring group 190 close to the image side, restricting the minimum distance between the objective lens barrel 121 and the image intensifier 220, thereby preventing the objective lens barrel 121 from colliding with the image intensifier 220 during the focusing process.

[0039] As Figures 7 to 12 shown, when assembling the main lens body 200, first slide the upper end and the lower end of the circuit board 230 from the image side to the object side and snap them into the card slots 212 on the upper and lower walls of the main lens frame 210. Then slide the conductive pin 240 through the through hole at the bottom of the dovetail groove 213 and insert the lower end into the crown spring terminal 235 at the top of the circuit board 230. Subsequently, slide the two image intensifiers 220 into the two connection cavities 211 of the main lens frame 210 from the image side respectively, so that the object side of the image intensifier 220 enters the columnar structure on the object side of the connection cavity 211 and is positioned. At the same time, the electrode 221 of the image intensifier 220 elastically abuts against the conductive elastic sheet 231 on the circuit board 230 to complete the installation of the main lens body 200.

[0040] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A four-eye night vision device, comprising an objective lens (100), a main lens body (200), and an eyepiece (300), wherein the main lens body (200) comprises a main lens frame (210) of a V-shaped structure, wherein the main lens frame (210) has two image intensifiers (220) built therein and a circuit board (230) is arranged between the image intensifiers (220), the object side of the main lens body (200) is detachably fixed with two objective lenses (100), and the image side of the main lens body (200) is detachably provided with an eyepiece (300); The eyepiece (300) comprises an eyepiece frame (310) detachably connected to the image side of the main mirror body (200), two sets of eyepiece lens groups (320) are arranged in the eyepiece frame (310), and an eyepiece ferrule (330) is fixed to one end of the eyepiece frame (310) away from the main mirror body (200); Features: The objective lens (100) comprises an objective lens seat (110) that slidably extends into a main lens frame (210) and abuts against an image intensifier (220), an objective lens group (120) that is threadedly connected to the image side and extends into the objective lens seat (110), an objective lens pressing ring (130) that is threadedly connected and extends into the main lens frame (210) and abuts against the objective lens seat (110), and a focusing hand wheel (140) that is fixedly sleeved on the objective lens group (120), wherein a flange plate (111) is provided on the image side of the objective lens seat (110), and the image side of the objective lens pressing ring (130) abuts against the flange plate (111), with a sealing ring I (150) provided therebetween.

2. The four-eye night vision device according to claim 1, characterized in that: The objective lens group (120) comprises an objective lens barrel (121), an objective lens group (122), a front pressure ring (123) detachably fixedly arranged on the object side of the objective lens barrel (121) and abutting against the objective lens group (122), a lens frame (124) for fixing the objective lens, and an objective lens spacer I (125), an objective lens spacer II (126), and an objective lens spacer III (127) for separating the objective lenses; The objective lens group (122) comprises a first lens (122A), a second lens (122B), a third lens (122C), a fourth lens (122D), a fifth lens (122E), a sixth lens (122F) and a seventh lens (122G) which are sequentially arranged along the optical path from the object side to the image side. The objective lens barrel (121) is a four-step hollow shaft with a diameter that decreases sequentially from the object side to the image side. The second lens (122B), the third lens (122C) and the fourth lens (122D) form a first cemented lens. The fifth lens (122E) and the sixth lens (122F) form a second cemented lens. The second cemented lens is fixedly sleeved in a lens frame (124) and is arranged in a second step hole on the image side of an objective lens barrel (121) with a seventh lens (122G) through an objective lens spacer ring III (127); the first cemented lens is slidably arranged in the second step hole on the object side of the objective lens barrel (121) and abuts against the lens frame (124) through an objective lens spacer ring II (126); the first lens (122A) is slidably arranged in the first step hole on the object side of the objective lens barrel (121) and abuts against the first cemented lens through an objective lens spacer ring I (125); and the image side of the front pressure ring (123) abuts against the first lens (122A).

3. The four-eye night vision device according to claim 2, characterized in that: The first lens (122A), the second lens (122B) and the fifth lens (122E) are all meniscus lenses with a convex surface on the object side, the third lens (122C) and the sixth lens (122F) are all double convex lenses, the fourth lens (122D) is a double concave lens, and the seventh lens (122G) is a single concave lens with a concave surface on the object side and a flat surface on the image side; the first lens (122A) is a positive refractive power objective lens, the first cemented lens is a negative refractive power objective lens, the second cemented lens is a positive refractive power objective lens, and the seventh lens (122G) is a negative refractive power objective lens.

4. The four-eye night vision device according to claim 2, characterized in that: The objective lens seat (110) is a two-step hollow shaft with a diameter decreasing from the object side to the image side. The flange (111) is coaxially fixedly arranged on the image side end surface of the objective lens seat (110). The image side step outer circumferential surface of the objective lens barrel (121) is threadedly connected and extends into the image side step hole of the objective lens seat (110). One of the step outer circumferential surfaces of the objective lens barrel (121) movably extends into the object side step hole of the objective lens seat (110) and a sealing ring II (170) is sleeved on the step outer circumferential surface. The focusing The image side sliding sleeve of the hand wheel (140) is provided with a retaining ring group (190), the retaining ring group (190) comprising an open retaining ring (191), screws I (192) connecting two sides of the opening of the retaining ring (191), and guide pins (193) vertically fixedly arranged on the image side of the retaining ring (191); the retaining ring (191) sliding sleeve is arranged on the focusing hand wheel (140); the object side of the objective lens pressing ring (130) is correspondingly provided with a guide hole, and the guide pin (193) slides and extends into the guide hole of the objective lens pressing ring (130).

5. The four-eye night vision device according to any one of claims 1 to 4, characterized in that: The main lens frame (210) is provided with connection cavities (211) on the left and right sides thereof. The two image intensifiers (220) are respectively slidably arranged in the two connection cavities (211) of the main lens frame (210). The two connection cavities (211) are mutually communicated inside the main lens frame (210), and the upper wall and the lower wall are respectively provided with card slots (212). The circuit board (230) is vertically arranged and is pluggable in the card slots (212) on the upper wall and the lower wall of the main lens frame (210). Two conductive spring sheets (231) are fixed to the two side surfaces of the circuit board (230) at intervals in the upper and lower directions. The conductive spring sheets (231) on the two sides of the circuit board (230) are respectively elastically abutted against the positive and negative electrodes of the two image intensifiers (220). The upper wall of the main lens frame (210) is penetrated with conductive pins (240) electrically connected to the conductive spring sheets (231) on the circuit board (230).

6. The four-eye night vision device according to claim 5, characterized in that: The conductive spring pieces (231) on the side of the circuit board (230) are arranged at the upper and lower sides of the central horizontal plane corresponding to the image intensifier (220), and the conductive spring pieces (231) include a plate-shaped connecting portion (231A) and a bending portion (231B). The connecting portion (231A) is fixedly fitted to the side of the circuit board (230), and the bending portion (231B) protrudes from the surface of the circuit board (230) and can elastically abut against the electrode (221) of the image intensifier (220); the image end of the bending portion (231B) is connected to the connecting portion (231A) and the object end is suspended; the cross section of the bending portion (231B) is a "V"-shaped structure with an opening facing the circuit board (230), and the top end corresponds to the position of the electrode (221) of the image intensifier (220); the orthographic projection of the suspended end of the bending portion (231B) on the side of the circuit board (230) is within the range of the connecting portion (231A).

7. The four-eye night vision device according to claim 6, characterized in that: The upper and lower conductive spring sheets (231) on one side of the circuit board (230) can respectively elastically abut against the positive and negative electrodes of the corresponding image intensifier (220), and the upper and lower conductive spring sheets (231) on the other side can respectively elastically abut against the negative and positive electrodes of the corresponding image intensifier (220). The conductive spring sheets (231) elastically abutting against the positive electrodes on both sides of the circuit board (230) are electrically connected to each other and the conductive spring sheets (231) elastically abutting against the negative electrodes are electrically connected to each other. The positive and negative conductive spring sheets (231) of the circuit board (230) are respectively electrically connected to the corresponding positive and negative conductive pins (240).

8. The four-eye night vision device according to claim 7, characterized in that: A conductive strip I (232) is vertically fixed on each side surface of the circuit board (230), the upper ends of the two conductive strips I (232) are electrically connected to the conductive spring sheet (231) on the same side, and the two conductive strips I (232) pass through the circuit board (230) near the lower conductive spring sheet (231) and are electrically connected to the conductive spring sheet (231) at the lower part of the other side; a conductive strip II (233) is also horizontally fixed on each side surface of the circuit board (230) and extends to the image side end surface close to the circuit board (230), one end of the conductive strip II (233) is electrically connected to the conductive strip I (232) on the same side and the other end is electrically connected to the corresponding conductive pin (240).

9. The four-eye night vision device according to claim 5, characterized in that: The circuit board (230) held in the slot (212) of the main lens frame (210) extends toward the image side and has a connecting plate (234) fixed horizontally on the top. Two crown spring terminals (235) matching with the conductive pins (240) are arranged at intervals on the upper surface of the connecting plate (234). The two crown spring terminals (235) are electrically connected to the corresponding positive and negative conductive spring sheets (231), respectively.

10. The four-eye night vision device according to claim 6, characterized in that: The portion of the connecting cavity (211) close to the object side is in a columnar structure and slides to house the object side portion of the image intensifier (220); the middle portion of the connecting cavity (211) and the side wall on the image side away from the circuit board (230) are arc surfaces that can fit the outer cylindrical surface of the image intensifier (220); and the electrode (221) of the image intensifier (220) is arranged close to the image side.

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