Large-aperture high-gain image intensifier and low-light vehicle-mounted night vision system thereof

Abstract

The utility model discloses a large-aperture high-gain image intensifier and a low-light vehicle-mounted night vision system thereof. The large-aperture high-gain image intensifier comprises a high-performance super second-generation image tube, a first-generation image tube, an amplification light cone and a high-voltage power supply, the cathode input window end face of the high-performance super second-generation image tube extends out of the end face of the shell, and the other end of the high-performance super second-generation image tube is coupled with one end of the first-generation image tube; the other end of the first-generation image tube is coupled with the small end face of the amplification light cone; the large end face of the amplification light cone extends out of the other end face of the shell. Practical application verifies that compared with a second-generation inverted image type image intensifier, the sensitivity of the device reaches 850 [mu] A / lm (the sensitivity of the second-generation inverted image type 25 mm image intensifier is 240 [mu] A / lm), the resolution of the device reaches 45 lp / mm (the sensitivity of the second-generation inverted image type 25 mm image intensifier is 28 lp / mm), and the maximum brightness gain of the device reaches 30000-50000 cd / m < 2 > / lx (the maximum brightness gain of the second-generation inverted image type 25 mm image intensifier is 9500-22300 cd / m < 2 > / lx).

Description

Technical Field

[0001] The present application relates to the technical field of intensifiers, and in particular to a large-aperture high-gain image intensifier and a low-light-level vehicle-mounted night vision system thereof. Background Art

[0002] The low-light image intensifier is an electric vacuum imaging device that can be used to detect, enhance and image scenes under ultraviolet light, visible light, near-infrared light, X-rays and gamma rays. The scenes under the collected weak light (such as night sky light) are displayed as enhanced visible light images through photocathode light-to-electric conversion, electron multiplier enhancement and fluorescent screen electric-to-optic conversion.

[0003] The low-light image intensifier is a multi-band, multi-functional optoelectronic device. For low-light night vision applications, it is used to amplify the weak night sky light such as moonlight, starlight, sky gas glow, etc. in the scene environment into a bright image visible to the human eye. From the working band point of view, the low-light image intensifier mainly works in the visible light and near-infrared bands.

[0004] Large-aperture image intensifiers are one of the development directions of image intensifiers. Large-aperture image intensifiers can collect target radiation energy to the maximum extent, capture more target information, and provide a more comfortable observation experience. In addition to being used in medical treatment, nuclear physics technology, airport security, industrial flaw detection and other fields, they are also widely equipped in the observation systems and fire control systems of tanks and armored vehicles.

[0005] After various vehicle-mounted night vision systems are equipped with large-aperture and high-gain image intensifiers, the comprehensive viewing distance and detection range of the night vision system can be greatly improved, thereby effectively expanding the observer's field of view and improving observation efficiency. -3 lx illumination or less), the human eye can clearly identify the target, meet the driver's real-time judgment and analysis needs for various road conditions, and the night driving effect is basically equivalent to the daytime driving effect. It meets the requirements of "the low-light night vision device must have a longer comprehensive viewing distance, clearer resolution, and a larger observation field, so that the driver can find more targets earlier and identify targets more clearly under high maneuverability conditions, and significantly improve the night vision ability in different battlefield environments."

[0006] At present, the largest aperture image intensifier in China is the one with an effective output diameter of 40mm and a length of 70mm; the one with the largest magnification is the second-generation inverted image intensifier, with a magnification of 1.5 times, an effective output diameter of 30mm and a length of 81.6mm.

[0007] In recent years, foreign countries have mainly focused on developing towards higher performance and smaller size, and the research on large-size image intensifiers has decreased.

[0008] There is no report on the method of using high-performance super second-generation image tubes, first-generation image tubes and magnified light cones to develop large-aperture high-gain image intensifiers, and there are no related products at home or abroad.

[0009] CN201120247921.X discloses a high-gain low-light-level image intensifier. The structure is composed of two independent and identical second-generation low-light-level image intensifiers. Since the coupled second-generation low-light-level image intensifiers are both equipped with microchannel plates, the brightness gain can be significantly improved. However, there is limited room for improvement of other performance indicators of the image intensifier. In addition, due to the high brightness gain (greater than 10 6 cd / m 2 / lx) causes the image intensifier noise points to be amplified as well, and the observation effect is not very good.

[0010] CN200920111346.3 discloses an image intensifier that amplifies through a light cone. The structure is a combination of a single-stage low-light image intensifier (tube) and a light cone. Its main function is to achieve image amplification with a magnification ratio of 1.5 to 2. Since the light cone is a gain-free element, the gain and resolution of the image intensifier are slightly reduced after coupling.

[0011] CN202223585961.2 discloses a miniaturized digital low-light camera based on a third-generation image tube, including: a third-generation image tube arranged in a camera housing and connected in an optical path, a ring-shaped automatic gain high-voltage power supply, a coupled light cone, a CMOS sensor, and a display device. The problem of target acquisition in low-light environments and illumination-changing scenes is solved, and the structure is compact and the weight of the whole machine is light, but the use of the third-generation image tube will increase the cost of the device.

[0012] The information disclosed in the background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0013] The present application provides a large-aperture, high-gain image intensifier and its low-light-level vehicle-mounted night vision system. The large-aperture, high-gain image intensifier adopts a combination of high-performance super-second-generation image tubes, first-generation image tubes and amplified light cones to solve the problems of low sensitivity and low brightness gain of existing second-generation inverted image intensifiers, short viewing distance and poor observation effect after being equipped with relevant night vision devices.

[0014] The present application provides a large-aperture high-gain image intensifier, comprising: a high-performance super second-generation image tube, a first-generation image tube, an amplified light cone, and a high-voltage power supply;

[0015] The cathode input window end face of the high-performance super second-generation image tube is extended out of the end face of the shell, and the other end of the high-performance super second-generation image tube is coupled with one end of the first-generation image tube; the other end of the first-generation image tube is coupled with the small end face of the magnified light cone; the large end face of the magnified light cone is extended out of the other end face of the shell;

[0016] The cathode input window end face of the high-performance super second-generation image tube is the object phase end, and an objective lens is arranged on the cathode input window end face of the high-performance super second-generation image tube and is optically connected to the objective lens;

[0017] An eyepiece is arranged on the small end face of the magnified light cone, and the outside of the eyepiece is the image end;

[0018] The high voltage power supply is arranged in the shell and is respectively connected with the high performance super second generation image tube, the first generation image tube and the amplified light cone for power supply.

[0019] Preferably, the cathode input window and the anode output window of the high-performance super-second-generation image tube are both optical fiber panels; the diameter of a single fiber of the optical fiber panel is 4 μm to 10 μm;

[0020] Preferably, the single tube resolution of the high-performance super second generation image tube is not less than 68lp / mm, the white light sensitivity is not less than 800μA / lm, and the output brightness non-uniformity of the high-performance super second generation image tube is less than 2:1 under white light conditions.

[0021] Preferably, the cathode input window and the anode output window of the first generation image tube are both optical fiber panels; the diameter of a single fiber of the optical fiber panel is 4 μm to 10 μm;

[0022] Preferably, the green light gain of a single tube of the first generation image tube is greater than 45cd / m 2 / lx, the resolution is greater than 83lp / mm, and the length L2 after optical cold working is 60.6±0.2mm.

[0023] Preferably, the magnification of the magnified light cone is 2 to 3 times, the small end surface is a plane, and the large end is a spherical surface.

[0024] Preferably, the housing comprises: a plastic shell and a metal shell; the plastic shell and the metal shell are threadedly connected; the high-performance super second-generation image tube and the first-generation image tube are accommodated in the plastic shell; and the magnified light cone is accommodated in the rear end of the metal shell.

[0025] Preferably, the end face of the cathode input window of the high-performance super-second-generation image tube extends out of the end face of the plastic shell by 1-2 mm.

[0026] Preferably, the rear end of the amplified light cone extends out of the back end surface of the metal housing by 6-7 mm.

[0027] Preferably, it comprises: a metal ferrule; the metal ferrule is sleeved on a step surface on the outer wall of the rear end of the metal shell.

[0028] Preferably, it comprises: silicone rubber; the silicone rubber is filled in the gap between the high-performance super second-generation image tube, the first-generation image tube and the plastic shell.

[0029] A low-light-level vehicle-mounted night vision system of the present application includes: a large-aperture high-gain image intensifier as described above; the large-aperture high-gain image intensifier is installed in a low-light-level night vision vehicle.

[0030] Preferably, it comprises: a gain circuit; the gain circuit is arranged on the low-light-level vehicle-mounted night vision system and is electrically connected to the high-voltage power supply on the large-aperture high-gain image intensifier;

[0031] Preferably, a first contact pin, a second contact pin, a third contact pin, and a fourth contact pin are arranged on the housing of the large-aperture high-gain image intensifier; the first contact pin, the second contact pin, the third contact pin, and the fourth contact pin are electrically connected to the high-voltage power supply respectively;

[0032] The gain circuit includes: a power supply, a sliding resistor, a fixed resistor, and a switch;

[0033] A switch is arranged on the circuit connecting the power source and the first contact pin; the second contact pin and the third contact pin are respectively connected in parallel with the sliding resistor; the sliding resistor is connected in series with the fixed resistor; and the fixed resistor is connected in parallel with the fourth contact pin.

[0034] The beneficial effects of this application include:

[0035] 1) The large-aperture, high-gain image intensifier provided in this application can be equipped with a low-light vehicle-mounted night vision system to improve the overall viewing distance and detection range of the entire device, expand the observer's field of view, and improve the observation efficiency of the user.

[0036] 2) The large-aperture high-gain image intensifier provided in this application has been verified through practical application to have a sensitivity of 850μA / lm (the second-generation inverted image 25mm image intensifier is 240μA / lm), a resolution of 45lp / mm (the second-generation inverted image 25mm image intensifier is 28 lp / mm), and a maximum brightness gain of 30,000 to 50,000cd / m 2 / lx (The maximum brightness gain of the second generation inverted image 25mm image intensifier is 9500~22300cd / m 2 / lx). BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the main structure of the large-aperture, high-gain image intensifier provided in this application;

[0038] Figure 2 This is a schematic diagram of the main perspective structure of the large-aperture, high-gain image intensifier provided in this application;

[0039] Figure 3 Schematic diagram of the three-dimensional appearance of the large-aperture high-gain image intensifier provided for this application; a) is an arc-shaped sink; b) is a rectangular slot at a 180° viewing angle;

[0040] Figure 4 A schematic diagram of the external circuit of the large-aperture, high-gain image intensifier provided for this application;

[0041] Legend:

[0042] High-performance super second-generation image tube 1, first-generation image tube 2, magnified light cone 3, high-voltage power supply 4, plastic shell 5, plastic cover 6, plastic spacer 7, metal shell 8, metal ferrule 9, connecting block 10, terminal 11, contact pin 12, screw 13, silicone rubber 14, positioning groove 51. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The controller used in this embodiment is an existing structure, and the control circuit can be implemented through simple programming by technicians in this field. It belongs to the common knowledge in this field. It is only used without modification, so the control method and circuit connection are not described in detail.

[0046] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0047] See also Figures 1 to 3 The large-aperture high-gain image intensifier provided in this application includes: a high-performance super second-generation image tube 1, a first-generation image tube 2, an amplified light cone 3, and a high-voltage power supply 4;

[0048] The cathode input window end face of the high-performance super second-generation image tube 1 is extended out of the end face of the shell, and the other end of the high-performance super second-generation image tube 1 is coupled with one end of the first-generation image tube 2; the other end of the first-generation image tube 2 is coupled with the small end face of the magnified light cone 3; the large end face of the magnified light cone 3 is extended out of the other end face of the shell;

[0049] The cathode input window end face of the high-performance super second-generation image tube 1 is an object phase end, and an objective lens is arranged on the cathode input window end face of the high-performance super second-generation image tube 1 and is optically connected to the objective lens;

[0050] An eyepiece is arranged on the small end face of the magnified light cone 3, and the outside of the eyepiece is the image end;

[0051] The high voltage power supply 4 is arranged in the housing and is respectively connected to the high performance super second generation image tube 1, the first generation image tube 2 and the amplified light cone 3 for power supply.

[0052] After assembly, the obtained large-aperture high-gain image intensifier is a direct-view type, and the user can directly obtain the imaging result in a low-light environment through the eyepiece. The large end in this application refers to the cross-sectional area relative to the small end.

[0053] After using the above device combination, the sensitivity of the device in low illumination environment can be effectively improved to 850μA / lm (the second generation inverted image 25mm image intensifier is 240μA / lm), the resolution can reach 45lp / mm (the second generation inverted image 25mm image intensifier is 28 lp / mm), and the maximum brightness gain can reach 30000~50000cd / m 2 / lx (The maximum brightness gain of the second generation inverted image 25mm image intensifier is 9500~22300cd / m 2 / lx).

[0054] In a specific embodiment, the shape of the enhancer is composed of 7 to 10 concentric cylinders of different radial and axial sizes connected in series, the diameter coaxiality error of each cylinder is within 0.1 mm, and the end face of the cathode input window of the high-performance super second-generation image tube 1 extends 1.5 mm beyond the end face of the plastic shell 5.

[0055] The rear end of the amplified light cone 3 extends 6.6mm from the back end face of the metal shell 8; there is a rectangular positioning groove 51 with a length of 11.5mm, a width of 6.4mm and a depth of 1.4mm on the cylindrical surface of the cathode end of the plastic shell 5, and there is an arc-shaped notch in the 180° direction of the positioning groove 51, with a notch radius of R26.15mm, a notch angle of 67 degrees, and a notch depth of 10.6mm. Four Ф1.5mm contact pins are distributed on the Ф58mm circumference of the bottom surface of the notch, with a contact pin height of 6.3mm, and two adjacent contact pins are separated by 17°; the output end has a diameter of Ф53.1mm, a concave spherical output end, a spherical radius of 111.58mm, a spherical top depth of 1mm to 5mm, and a 45° inclined surface on the output end face, which forms a 47° angle with the input end positioning groove. The contact pins are used to realize electrical connection with an external gain adjustment circuit.

[0056] Reference Figure 1 , Figure 2The high-performance super second-generation image tube 1 is the company's NVT-6 image tube. The first close contact distance of the high-performance super second-generation image tube 1 is 0.1-0.2mm, and the second close contact distance is 0.5-0.7mm. The cathode input window and anode output window of the high-performance super second-generation image tube 1 are both optical fiber panels, and the single fiber diameter of the optical fiber panel is 4μm-10μm. After tube making, the single tube resolution is not less than 68lp / mm, the white light sensitivity is not less than 800μA / lm, and the output brightness non-uniformity (white light) of the high-performance super second-generation image tube 1 is less than 2:1. After optical cold processing, the length L1 is 15.3±0.1mm.

[0057] Reference Figure 1 , Figure 2 The distance from the small end surface of the cone electrode of the first generation image tube 2 to the cathode arc top is 20±0.2mm, and the distance to the anode arc top is 35.3±0.2mm. The cathode input window and the anode output window are both optical fiber panels. The single fiber diameter of the optical fiber panel is 4μm~10μm. The single tube green light gain is greater than 45cd / m 2 / lx, the resolution is greater than 83lp / mm, and the length L2 after optical cold working is 60.6±0.2mm.

[0058] Reference Figure 1 , Figure 2 The magnification of the magnified light cone 3 is 2 to 3 times. The small end face is a plane, the large end is a spherical surface, and the output end face has a 45° inclined surface. The intersection of the inclined surface and the large end face is 21 mm from the axis of the light cone.

[0059] In a specific embodiment, the total length L of the high-performance super second-generation image tube 1, the first-generation image tube 2 and the magnified light cone 3 after coupling is 129.6±0.6 mm.

[0060] In a specific embodiment, referring to Figure 2 The high-voltage power supply 4 is an automatic gated high-voltage power supply dedicated to the image intensifier. It can convert DC low voltage into multiple DC high voltages to power the high-performance super second-generation image tube 1 and the first-generation image tube 2 respectively. It has brightness gain adjustment function, automatic brightness control function (ABC), strong light protection function (BSP) and electromagnetic compatibility function (EMC). The maximum output voltage is 15000v, and the high-voltage power supply 4 has a "C" type structure.

[0061] In a specific embodiment, referring to Figure 2 , Figure 3The material of the plastic shell 5 is black polyphenylene oxide (PPO), which has good affinity with the silicone rubber 14. The external structure is a shaft sleeve part, with the external dimensions of 63mm×74mm at the largest part, a rectangular groove and an arc-shaped sink at one end, and an external thread at the other end. The interior is composed of through holes and stepped blind holes. The 43.5mm through hole is used to locate the cathode input window of the high-performance super second-generation image tube 1. The other stepped inner holes are mainly used to place the coupled high-performance super second-generation image tube 1, the first-generation image tube 2 and the high-voltage power supply 4, and are filled with silicone rubber 14 according to the hole shape.

[0062] In a specific embodiment, the shell includes: a plastic shell 5 and a metal shell 8; the plastic shell 5 and the metal shell 8 are threadedly connected; the high-performance super second-generation image tube 1 and the first-generation image tube 2 are accommodated in the plastic shell 5; and the magnified light cone 3 is accommodated in the rear end of the metal shell 8.

[0063] In a specific embodiment, the plastic housing 5 is manufactured by mechanical processing, and a mechanical installation structure for installing the contact pin 12 and the screw 13 is provided at the arc-shaped sink. The plastic housing 5 is connected to the plastic cover plate 6 by a hole-shaft matching connection, and is connected to the metal housing 8 by a threaded connection. The outer wall of the plastic housing 5 is provided with an external thread that matches the metal housing 8, and an internal thread is provided on the inner wall of the metal housing 8 to achieve the threaded connection.

[0064] In a specific embodiment, referring to Figure 2 The material of the plastic cover plate 6 is black polyphenylene oxide (PPO), which has good affinity with the silicone rubber 14. It is made by mechanical processing. A through hole is set in the middle of the plastic cover plate 6 for positioning the high-performance super second-generation image tube 1 to ensure that the axis of the high-performance super second-generation image tube 1 is concentric with the axis of the plastic shell 5. An annular groove is set on the inside. Through the annular groove, the outer circle of the plastic cover plate 6 and the inner hole of the plastic shell 5 are installed to achieve coaxiality. Four through holes of Ф1 to Ф3 are evenly spaced along the circumference on the end face of the plastic cover plate 6, which facilitates the screwing in and out of the plastic cover plate 6 and can also play a role in exhausting when the silicone rubber 14 is filled.

[0065] In a specific embodiment, referring to Figure 2 The plastic spacer 7 is made of phenolic laminated glass cloth board with good insulation. It is assembled between the anode flange of the first-generation image tube 2 and the plastic cover 6 to play the role of axial positioning and high-voltage isolation. Eight through holes of Ф4.5mm are evenly distributed within its circumference to ensure that the silicone rubber 14 can enter the gap between the plastic shell 5 and its internal components, maintain the vacuum seal of the external environment of the high-performance super second-generation image tube 1 and the first-generation image tube 2, and avoid discharge during use that affects the normal function of the device.

[0066] In a specific embodiment, referring to Figure 2 , Figure 3The metal shell 8 is made of hard aluminum 2A12-H1 and is made by mechanical processing. It is oxidized to black after processing. The total length of the part is 110mm. Its structure is a shaft structure, consisting of several inner holes and outer circles. The inner holes at least include Ф63mm, Ф53.1mm inner holes and M63×1 internal threads. It is mainly used for positioning and installation with the plastic shell 5 and the magnified light cone 3.

[0067] In a specific embodiment, referring to Figure 2 , Figure 3 The metal ferrule 9 is made of hard aluminum 2A12-H1 and is made by mechanical processing. The surface is oxidized to black after processing. The part size is Ф58.6mmmm×Ф64mmmm×12.8mm. A notch plane is processed on the cylindrical surface. The notch plane is parallel to the axis and the distance to the axis is 31mm. The metal ferrule 9 is bonded to the metal shell 8. It is convenient for

[0068] In a specific embodiment, referring to Figure 2 The connecting block 10 is made of organic glass and has four holes spaced 17 degrees apart for fixing the connecting posts 11. After the connecting block 10 fixes the four connecting posts 11, it is connected to the plastic housing 5 and the contact pin 12 through screws 13 to form an interface structure of the image intensifier.

[0069] In a specific embodiment, referring to Figure 2 The material of the terminal 11 is stainless steel with nickel plating on the surface. After being welded with the wires related to the high-voltage power supply 4, it cooperates with the hole of the connecting block 10 and has an internal thread that cooperates with the screw 13 for connection.

[0070] In a specific embodiment, referring to Figure 2 The contact pin 12 is made of stainless steel with nickel plating. Its structure includes a 1.6mm through hole and a 1.5mm cylindrical boss with a height of 6.3mm. The cylindrical boss is used to connect with the whole machine. The 1.6mm through hole is used for the screw 13 to pass through. The hole is a 90° countersunk structure. After the screw 13 is assembled, the surface is lower than the contact pin 12 plane.

[0071] In a specific embodiment, referring to Figure 2 The specification of screw 13 is M1.4 countersunk screw with a total length of 4.5 mm.

[0072] In a specific embodiment, referring to Figure 2 , the two-component silicone rubber 170A+B of silicone rubber 14 belongs to dimethyl silicone rubber.

[0073] A low-light-level night vision vehicle of the present application includes: the large-aperture high-gain image intensifier as described above; the large-aperture high-gain image intensifier is installed in the low-light-level night vision vehicle.

[0074] The vehicle in this application can be a helmet, a firearm, a vehicle, a tank, or other object that the sighting system needs to directly see to obtain imaging effects in a low-light environment.

[0075] The user directly forms an image through the eyepiece on the large-aperture high-gain image intensifier, which is composed of one or more glass lenses. For the specific eyepiece structure, please refer to the existing eyepiece structure. The specific installation method of the intensifier on the vehicle can be set according to the existing vehicle installation method, and the shell part can be adjusted according to the specific structural requirements of the vehicle.

[0076] See also Figure 4 , preferably, comprising: a gain circuit; the gain circuit is arranged on the low-light-level vehicle-mounted night vision system and is electrically connected to the high-voltage power supply on the large-aperture high-gain image intensifier;

[0077] Preferably, a first contact pin, a second contact pin, a third contact pin, and a fourth contact pin are arranged on the housing of the large-aperture high-gain image intensifier; the first contact pin, the second contact pin, the third contact pin, and the fourth contact pin are electrically connected to the high-voltage power supply respectively;

[0078] The gain circuit includes: a power supply, a sliding resistor, a fixed resistor, and a switch;

[0079] A switch is arranged on the circuit connecting the power source and the first contact pin; the second contact pin and the third contact pin are respectively connected in parallel with the sliding resistor; the sliding resistor is connected in series with the fixed resistor; and the fixed resistor is connected in parallel with the fourth contact pin.

[0080] The assembly process of the large-aperture high-gain image intensifier includes: assembly and potting, specifically, the following steps:

[0081] 1) Prepare high-performance super second-generation image tubes 1 and first-generation image tubes 2 in accordance with the company's relevant process, and purchase corresponding magnified light cones 3.

[0082] 2) According to the tube selection standards, select high-performance super second-generation image tubes 1 and first-generation image tubes 2 that have passed the second inspection and process them to the corresponding dimensions and geometric tolerances according to the single tube processing drawings;

[0083] 3) Check whether the image tube and magnifying light cone 3 in 2) are intact, and whether the dimensions and surface finish meet the requirements. Clean the image tube, magnifying light cone 3 and high-voltage power supply 4 with isopropyl alcohol ultrasonically for 3 to 5 minutes and place them in a 50°C oven for 2 hours for standby use;

[0084] 4) Prepare an appropriate amount of coupling glue at a ratio of 3 drops of curing agent for every 5 ml of M62 coupling glue, stir thoroughly, and let stand for 2 to 10 hours for use; prepare white glue and black glue in silicone rubber 14 at a ratio of 1:1, stir thoroughly, exhaust, and let stand for use.

[0085] 5) Use M62 coupling glue to couple the output surface of high-performance super second-generation image tube 1 and the input surface of first-generation image tube 2 through coupling fixture A. Use coupling fixture A to ensure that the axes of the two image tubes are coaxial, and use exhaust fixture to ensure that there are no bubbles and interference fringes on the two coupling surfaces. After coupling, place it together with coupling fixture A in an oven at 40℃~60℃ for 8~15 hours;

[0086] 6) Solder the image tube and high voltage power supply 4 in 5) together according to the electrode definition. The solder joints should be round and firm without any cold solder joints.

[0087] 7) Weld the four input wires of the medium and high voltage power supply 4 of 6) to the terminal 11, and then connect them to the plastic housing 5 through the connecting block 10, the contact pin 12 and the screw 13, apply affinity agent on the corresponding surface, and install the plastic spacer 7 and the plastic cover 6 to the corresponding positions in sequence;

[0088] 8) Place the product assembled in 7) together with the plastic shell 5 into the potting fixture, rotate the corresponding adjustment screws to calibrate the parallelism, ensure that the relevant external dimensions and parallelism are within the required range, and then fill the shell with silicone rubber 14 through the potting fixture and place it in the air for more than 12 hours.

[0089] 9) After the silicone rubber 14 in 8) is completely cured, remove the plastic shell 5 from the potting fixture, wipe the output surface of the first-generation image tube 2 and the small end face of the magnified light cone 3 with acetone, use M62 coupling glue to couple the output surface of the first-generation image tube 2 with the small end face of the magnified light cone 3 through the coupling fixture B, ensure that the axis of the image tube and the axis of the light cone are coaxial through the coupling fixture B, rotate the magnified light cone 3 to ensure that the 45° bevel and the rectangular positioning groove of the plastic shell 5 are at a 47° angle, and use the exhaust fixture to ensure that there are no bubbles and interference fringes on the two coupling surfaces. After coupling, place it together with the fixture in an oven at 40℃~60℃ for 8~15 hours;

[0090] 10) Connect the metal shell 8 to the plastic shell 5 in 9) through threaded fitting, ensure that the end face of the Ф53.1 inner hole in the metal shell 8 is in contact with the end face of the plastic shell 5, and ensure that the magnified light cone 3 protrudes 6.6mm from the end face of the metal shell 8. Apply a small amount of one-component silicone rubber GD108 to the holes and internal threads at both ends of the metal shell 8.

[0091] 11) Apply a small amount of one-component silicone rubber GD108 on the mating surfaces of the metal ferrule 9 and the metal shell 8, assemble the metal ferrule 9 with the metal shell 8 through the hole-shaft fit, rotate the metal ferrule 9, and use the positioning fixture to ensure that the notch plane of the metal ferrule 9 and the 45° inclined surface of the light cone are at the same angle.

[0092] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-aperture high-gain image intensifier, characterized in that: include: High-performance super second-generation image tube, first-generation image tube, magnified light cone, high-voltage power supply; The cathode input window end face of the high-performance super second-generation image tube is extended out of the end face of the shell, and the other end of the high-performance super second-generation image tube is coupled with one end of the first-generation image tube; the other end of the first-generation image tube is coupled with the small end face of the magnified light cone; the large end face of the magnified light cone is extended out of the other end face of the shell; The cathode input window end face of the high-performance super second-generation image tube is the object phase end, and an objective lens is arranged on the cathode input window end face of the high-performance super second-generation image tube and is optically connected to the objective lens; An eyepiece is arranged on the small end face of the magnified light cone, and the outside of the eyepiece is the image end; The high voltage power supply is arranged in the shell and is respectively connected with the high performance super second generation image tube, the first generation image tube and the amplified light cone for power supply.

2. The large-aperture, high-gain image intensifier according to claim 1, characterized in that: The cathode input window and anode output window of the high-performance super second-generation image tube are both optical fiber panels; the diameter of a single fiber in the optical fiber panel is 4μm to 10μm.

3. The large-aperture, high-gain image intensifier according to claim 1, characterized in that: The single tube resolution of the high-performance super second-generation image tube is not less than 68lp / mm, the white light sensitivity is not less than 800μA / lm, and the output brightness non-uniformity of the high-performance super second-generation image tube is less than 2:1 under white light conditions.

4. The large-aperture high-gain image intensifier according to claim 1, characterized in that: The cathode input window and anode output window of the first generation image tube are both optical fiber panels; the diameter of a single fiber in the optical fiber panel is 4μm to 10μm.

5. The large-aperture, high-gain image intensifier according to claim 1, characterized in that: The green light gain of a single tube of the first generation image tube is greater than 45cd / m 2 / lx, the resolution is greater than 83lp / mm, and the length L2 after optical cold working is 60.6±0.2mm; The magnification of the magnified light cone is 2 to 3 times.

6. The large-aperture, high-gain image intensifier according to claim 1, characterized in that: The shell comprises: a plastic shell and a metal shell; the plastic shell and the metal shell are threadedly connected; a high-performance super second-generation image tube and a first-generation image tube are accommodated in the plastic shell; and an amplified light cone is accommodated in the rear end of the metal shell.

7. The large-aperture, high-gain image intensifier according to claim 6, characterized in that: The cathode input window end face of the high-performance super second-generation image tube extends 1~2mm beyond the end face of the plastic shell.

8. The large-aperture high-gain image intensifier according to claim 6, characterized in that: The rear end of the magnified light cone extends 6 to 7 mm beyond the back end surface of the metal housing.

9. The large-aperture, high-gain image intensifier according to claim 6, characterized in that: include: The metal ferrule is sleeved on the step surface on the outer wall of the rear end of the metal shell.

10. The large-aperture, high-gain image intensifier according to claim 6, characterized in that: include: Silicone rubber; Silicone rubber is filled in the gap between high-performance super second-generation image tubes, first-generation image tubes and plastic shells.

11. A low-light vehicle-mounted night vision system, characterized in that: include: The large-aperture, high-gain image intensifier according to any one of claims 1 to 10; the large-aperture, high-gain image intensifier is installed in a low-light-level vehicle-mounted night vision system.

12. The low-light-level vehicle-mounted night vision system according to claim 11, characterized in that: include: Gain circuit; the gain circuit is arranged on the low-light-level vehicle-mounted night vision system and is electrically connected to the high-voltage power supply on the large-aperture high-gain image intensifier.

13. The low-light-level vehicle-mounted night vision system according to claim 11, characterized in that: A first contact pin, a second contact pin, a third contact pin and a fourth contact pin are arranged on the housing of the large-aperture high-gain image intensifier; The first contact pin, the second contact pin, the third contact pin and the fourth contact pin are electrically connected to the high voltage power supply respectively; The gain circuit includes: a power supply, a sliding resistor, a fixed resistor, and a switch; A switch is arranged on the circuit connecting the power source and the first contact pin; the second contact pin and the third contact pin are respectively connected in parallel with the sliding resistor; the sliding resistor is connected in series with the fixed resistor; and the fixed resistor is connected in parallel with the fourth contact pin.

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