Copper-silver-zinc alloy, copper-silver-zinc alloy optical fiber, light cone and preparation method and application of copper-silver-zinc alloy optical fiber and light cone

Abstract

The invention discloses a copper-silver-zinc alloy, a copper-silver-zinc alloy optical fiber, a light cone and a preparation method and application of the copper-silver-zinc alloy optical fiber and the light cone, the sum of the content of copper, the content of silver and the content of zinc in the copper-silver-zinc alloy is larger than or equal to 99.99 wt%, the content of copper ranges from 15 wt% to 50 wt%, the content of silver ranges from 10 wt% to 80 wt%, and the content of zinc ranges from 5 wt% to 40 wt%. The technical problem to be solved is that optical fiber monofilaments plated with copper-silver-zinc alloy layers are used for preparing the light cone, so that the optical crosstalk prevention and electromagnetic interference resistance of a prepared light panel are remarkably improved, and high-resolution image transmission of the light cone capable of preventing crosstalk and resisting high-frequency electromagnetic pulses is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ICCD / ICOMS coupling imaging element preparation, and in particular relates to a copper-silver-zinc alloy, a copper-silver-zinc alloy optical fiber, a light cone, and a preparation method and application thereof. Background Art

[0002] The light cone is a tapered optical fiber array image transmission material made by melting and pressing tens of millions of micron-level tapered optical fibers at high temperature. It has the characteristics of high light transmission efficiency, small inter-stage coupling loss, clear and true image transmission, and zero thickness. When the light cone works in a strong electromagnetic field environment, it often faces the problems of reduced accuracy and disturbed stability, which significantly affects the accuracy and stability of image transmission, causes errors in measurement data, and even components may suffer direct damage from high-frequency pulses.

[0003] In the current optical cone technology, during the transmission process of optical signals, due to the close arrangement of optical fibers, optical signals generate crosstalk between adjacent optical fibers. This phenomenon causes the signal to leak to other channels, thus having a negative impact on the communication quality. Especially in the scenario of long-distance transmission, crosstalk between cores becomes a key factor limiting transmission efficiency. Therefore, how to effectively reduce crosstalk between optical fibers and improve the quality and efficiency of optical fiber communication systems has become a technical problem that needs to be overcome in the field of optical cones. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to provide a copper-silver-zinc alloy, a copper-silver-zinc alloy optical fiber, a light cone and a preparation method and application thereof. The technical problem to be solved is to use an optical fiber monofilament plated with a copper-silver-zinc alloy layer for the preparation of a light cone, so that the anti-optical crosstalk and anti-electromagnetic interference capabilities of the prepared light panel are significantly improved, thereby achieving high-resolution imaging of a light cone that is anti-crosstalk and resistant to high-frequency electromagnetic pulses.

[0005] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. The present invention proposes a copper-silver-zinc alloy, in which the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy is ≥ 99.99wt%, and the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

[0006] The purpose of the present invention and the technical problems to be solved can be further achieved by adopting the following technical measures.

[0007] Preferably, the aforementioned copper-silver-zinc alloy, wherein the oxygen content in the copper-silver-zinc alloy is <5ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is ≤8ppm, and the sum of the contents of other impurities is ≤6ppm.

[0008] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. A method for preparing a copper-silver-zinc alloy proposed by the present invention comprises the following steps:

[0009] The alloy composition and the corresponding proportions are determined according to the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy being ≥ 99.99wt%, the content of copper being 15wt% to 50wt%, the content of silver being 10wt% to 80wt%, and the content of zinc being 5wt% to 40wt%; the corresponding single metal material is selected as the raw material, the metal raw material is pretreated, and the pretreated metal raw material is heated to 775 to 800° C. while stirring until the metal is completely melted and mixed evenly, so as to obtain the copper-silver-zinc alloy.

[0010] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures. A method for preparing a copper-silver-zinc alloy-coated optical fiber proposed in the present invention comprises the following steps:

[0011] S1 draws the optical fiber preform into optical fiber bare wire;

[0012] S2: coating the surface of the bare optical fiber with copper-silver-zinc alloy to form an optical fiber monofilament with a copper-silver-zinc alloy coating, and collecting the optical fiber monofilament to obtain the copper-silver-zinc alloy-coated optical fiber.

[0013] The purpose of the present invention and the solution of its technical problems can also be achieved by the following technical measures. The present invention proposes a copper-silver-zinc alloy-coated optical fiber, which comprises an optical fiber core layer, an optical fiber sheath and a copper-silver-zinc alloy coating from the inside to the outside; in terms of weight percentage, the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy coating is ≥ 99.99wt%, and the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

[0014] The purpose of the present invention and the solution to its technical problems can also be achieved by the following technical measures. The present invention proposes a light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance, which includes an output end, an input end and an optical fiber part arranged between the output end and the input end; the optical fiber part includes a plurality of copper-silver-zinc alloy optical fibers, which are an optical fiber core layer, an optical fiber sheath and a copper-silver-zinc alloy coating from the inside to the outside, and light absorbing wires and interstitial wires are inserted between different optical fibers; in terms of weight percentage, the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy coating is ≥99.99wt%, and the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

[0015] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical measures. The present invention proposes a method for preparing a light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance, comprising the following steps:

[0016] a. Put the leather tube on the core rod to make an optical fiber preform;

[0017] b. melting the optical fiber preform obtained in step a into an optical fiber monofilament, and performing a metal coating process to coat a metal coating on the outer surface to produce a metal-coated optical fiber monofilament;

[0018] c. Drawing the black absorption rod into a light-absorbing monofilament, and arranging the metal-plated optical fiber monofilaments obtained in step b in a hexagonal close-packed manner, and uniformly filling the light-absorbing filaments in the gaps of the metal-plated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament;

[0019] d. Arranging a plurality of primary fiber filaments in a hexagonal close-packed manner, and inserting a light-absorbing filament into the gaps formed by the hexagonal close-packed arrangement of the plurality of primary fiber filaments according to a certain rule to obtain a primary composite rod; drawing the primary composite rod into a primary multifilament; then, regularly cutting the primary multifilament, arranging the hexagonal close-packed filaments and bundling them to obtain a secondary composite rod; drawing the secondary composite rod into a secondary multifilament; then, regularly cutting the secondary multifilament, arranging the hexagonal close-packed filaments and bundling them to obtain a secondary multifilament rod;

[0020] e. Drawing the secondary composite rod obtained in step d at 660-680°C to obtain a molten fiber bundle; cutting it to a fixed length and then mechanically cold working it to obtain a cylindrical blank; stretching the blank at a temperature of 780-800°C and a tensile force of 300-400N, and after stretching, cutting it from the center position to obtain two symmetrical light cone blanks; then optically finishing and optically polishing the light cone blanks to obtain the light cone with high transmittance, anti-crosstalk and resistance to high-frequency pulses.

[0021] The purpose of the present invention and the technical problems to be solved can be further achieved by adopting the following technical measures.

[0022] Preferably, in the above-mentioned method for preparing a light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance, in step a, the refractive index of the leather tube at a wavelength of 532nm is 1.50-1.51, and the refractive index of the core rod at a wavelength of 532nm is 1.80-1.81.

[0023] Preferably, in step c, the primary composite rod comprises metal-plated fiber monofilaments and light-absorbing filaments; and the black absorption rod is made of glass having an absorption coefficient of greater than 0.95 in the wavelength range of 500 to 600 nm.

[0024] The purpose of the present invention and the solution to its technical problems can also be achieved by the following technical measures: The present invention proposes an image-intensified CCD camera, which includes the above-mentioned light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance.

[0025] The purpose of the present invention and the solution to its technical problems can also be achieved by the following technical measures: The present invention proposes an image-intensified CMOS camera, which includes the above-mentioned light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance.

[0026] Compared with the prior art, the copper-silver-zinc alloy, copper-silver-zinc alloy optical fiber, light cone and preparation method and application thereof of the present invention have the following beneficial effects:

[0027] The present invention provides a method for preparing a light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance. The method involves applying a metal coating on the outer surface of an optical fiber monofilament to prepare a high-transmittance light cone that can effectively suppress optical crosstalk and resist high-frequency electromagnetic pulses; first, the optical fiber raw material is processed into an optical fiber monofilament, and then a metal coating with a certain thickness is formed on the outer surface of the optical fiber filament through a molten metal coating process, thereby reducing the generation of stray light during signal transmission of a single optical fiber and weakening the optical crosstalk of adjacent optical fibers to the optical fiber, thereby achieving high transmittance, high precision and high-resolution transmission of image signals; achieving high transmittance, high precision and high-resolution transmission of image signals, improving the light cone's absorption capacity and anti-interference ability for high-frequency electromagnetic pulses, maintaining the normal operation of the light cone in a strong magnetic field environment, and enhancing the stability of the light cone's image transmission, thereby ensuring the accuracy and resolution of the light cone's signal transmission.

[0028] The high-transmittance, crosstalk-proof and high-frequency pulse-resistant light cone provided by the present invention improves transmission efficiency: by reducing stray light and optical crosstalk, high-transmittance, high-precision and high-resolution transmission of image signals are ensured; anti-interference performance is enhanced: the copper-silver-zinc alloy coating significantly enhances the absorption and resistance capabilities of the optical fiber array to high-frequency pulses, ensuring stable operation in a strong magnetic field environment; and overall performance is improved: the application of this coated optical fiber monofilament to a tapered optical fiber array significantly improves the optical crosstalk and electromagnetic interference resistance capabilities of the optical fiber array, achieving high-resolution image transmission.

[0029] The light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance provided by the present invention has a copper-silver-zinc alloy coating with a refractive index of 1.2-1.5 at a wavelength of 532nm, a reflectivity of 78-85% at a wavelength of 532nm, a conductivity of ≥95% IACS, and a coating elongation of ≥27%; the shielding effectiveness can reach 84dB-95dB under a test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz-1GHz, thereby ensuring that the manufactured light cone has high anti-interference performance.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the copper-silver-zinc alloy-plated optical fiber preparation system of the present invention;

[0032] Figure 2 A schematic diagram of a primary multifilament cross section of a light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance according to the present invention;

[0033] Figure 3 The process flow chart of the preparation of the light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance of the present invention;

[0034] Figure 4 This is a schematic diagram of the anti-electromagnetic interference principle of the copper-silver-zinc alloy coating of the present invention;

[0035] Figure 5 Schematic diagram of the coupling between the light cone with high transmittance, crosstalk prevention and high-frequency pulse resistance and CCD / CMOS of the present invention.

[0036] Among them, 1-preform rod; 2-optical fiber former; 3-annealing tube; 4-caliber measuring tube; 5-metal coating device; 6-optical fiber collecting device; 7-filling wire; 8-copper-silver-zinc alloy coating; 9-light absorbing wire; 10-optical fiber core layer; 11-optical fiber skin layer; 12-internal absorption wave; 13-incident wave; 14-optical fiber filament; 15-reflected wave; 16-transmitted wave; 17-internal multiple reflection wave; 18-copper-silver-zinc alloy coating; 19-light cone; 20-photosensitive surface; 21-CCD / CMOS. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the copper-silver-zinc alloy, copper-silver-zinc alloy optical fiber, light cone and its preparation method and application thereof proposed by the present invention are described in detail below in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0038] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the usual meanings understood by ordinary technicians in the field to which the present invention belongs. If no specific experimental steps or conditions are specified below, the operations or conditions of the conventional experimental steps described in the literature in the field can be followed.

[0039] The production process of ordinary optical fiber involves placing the optical fiber preform in a high-temperature furnace, heating it to a suitable softening drawing temperature, and then precisely drawing it to form the initial optical fiber filament. However, the inherent characteristics of this type of optical fiber - the optical refractive index of the core layer is significantly higher than that of the cortex, resulting in part of the light failing to achieve total reflection in the core layer during optical signal transmission, but instead penetrating the core layer into the cortex, thereby causing optical crosstalk, significantly reducing the resolution and clarity of the imaging. At the same time, when working in a strong electromagnetic field environment, electromagnetic radiation has a certain impact on the accuracy and stability of the image transmission, causing errors in the measurement data. High-frequency electromagnetic pulses can even directly damage optical devices such as cameras and optical fiber panels. Therefore, it is necessary to make corresponding adjustments and designs to the structure of the optical fiber, such as Figure 1 As shown in the figure, a unique copper-silver-zinc alloy-coated optical fiber technology is introduced. This technology successfully produces copper-silver-zinc alloy-coated optical fiber by coating a fine copper-silver-zinc alloy thin layer on the surface of the initially drawn optical fiber. This copper-silver-zinc alloy coating not only significantly reduces the optical transmittance of the optical fiber and effectively curbs the problem of optical crosstalk, but also demonstrates excellent isolation, discharge, reflection and absorption capabilities for high-frequency pulse energy, attenuating it to a level that electronic information equipment can safely withstand. This design greatly enhances the light cone's ability to absorb and resist interference with high-intensity high-frequency pulses, such as Figure 4 As shown. After the electromagnetic pulse incident wave 13 reaches the copper-silver-zinc alloy coating 18, most of it will be reflected by the copper-silver-zinc alloy coating 18 to form a reflected wave 15; another part enters the copper-silver-zinc alloy coating 18 and is absorbed by the copper-silver-zinc alloy coating 18, i.e., the internal absorption wave 12; of the electromagnetic pulse signal that is not absorbed, a part enters the optical fiber monofilament 14 to form a transmitted wave 16, and the other part forms an internal multiple reflection wave 17 inside the metal coating 18, which is reflected multiple times inside the copper-silver-zinc alloy coating 18 and is transmitted in the direction of the copper-silver-zinc alloy coating 18. The present invention solves the existing problems of optical crosstalk and electromagnetic interference on the structural unit. Optical devices made of optical fiber monofilaments plated with copper-silver-zinc alloy can achieve high transmittance, high resolution, and high-definition image transmission of optical devices, and can resist high-frequency electromagnetic pulse interference, opening up a new way for the stable application and performance improvement of optical technology.

[0040] In fact, the common light cones currently produced in large quantities all rely solely on light-absorbing glass to absorb stray light and improve image resolution. However, in the actual signal transmission process, some stray light is still not absorbed, so the light structure needs to be further adjusted. Since the copper-silver-zinc alloy layer is plated on the outside of the optical fiber monofilament, it can largely limit the transmission of light signals from the inside of the optical fiber. When making the optical fiber monofilament, the copper-silver-zinc alloy is coated on its outer surface to form a copper-silver-zinc alloy coating, which can greatly limit the overflow of light signals and improve transmission efficiency; improve the light cone's ability to absorb high-level electromagnetic pulses and its anti-interference ability.

[0041] At the same time, the light cone uses more metal than the optical fiber panel. The alloy with a designed silver content of 92wt% to 95wt% will greatly increase the material cost of the light cone, which is not conducive to the control of product cost in actual production. Therefore, the coating metal of the light cone is redesigned. The design needs to take into account the characteristics of high transmittance, anti-crosstalk, and resistance to high-frequency pulses, and select the appropriate alloy ratio to reasonably control the coating alloy cost, which is conducive to the promotion and use of the invention. Since copper has a high melting point, as the silver content decreases, the increase in copper content will increase the melting point of the alloy. If the melting point temperature is too high, when the optical fiber monofilament is coated, the optical fiber monofilament will be deformed due to the high temperature, so metal zinc with a lower melting point is added to reduce the melting point of the alloy. The alloy composition and corresponding proportions are determined according to the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy being ≥ 99.99wt%, the copper content being 15wt% to 50wt%, the silver content being 10wt% to 80wt%, and the zinc content being 5wt% to 40wt%, so that the melting point of the copper-silver-zinc alloy is between 665 and 775°C, the coating temperature will not cause deformation of the optical fiber, and during wire drawing and melting, the alloy is in a softened state and is completely attached to the optical fiber filament.

[0042] To this end, some embodiments of the present invention provide a copper-silver-zinc alloy copper-silver-zinc alloy coating, in which the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy is ≥ 99.99wt% by weight, and the low purity of the alloy causes uncertain fluctuations in the temperature range of the melting point and softening temperature of the alloy; and the copper content is 15wt% to 50wt%, the silver content is 10wt% to 80wt%, and the zinc content is 5wt% to 40wt%. Wherein the copper content is less than 15wt%, or the silver content is less than 10wt%, or the zinc content is greater than 40wt%, which will make the melting point of the alloy too low, and in the subsequent wire drawing and melting and pressing process, the coating will be damaged to a large extent, which is not conducive to the stability of the performance of the coated optical fiber; the copper content is greater than 50wt%, the silver content is greater than 80wt%, and the zinc content is less than 5wt%, which will make the melting point of the alloy higher than 775℃, then the temperature in the heating furnace is not enough to completely melt the alloy, or increasing the melting temperature will cause the molten alloy in the high temperature state to soften the optical fiber monofilament during the coating, which is not conducive to the preparation of the coated optical fiber. The oxygen content is less than 5ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is less than 8ppm, and the sum of the contents of other impurities is less than 6ppm. The impurity content needs to be controlled in a relatively low range. Too high a content is not conducive to the stability of the alloy properties. The preferred copper-silver-zinc alloy composition is shown in Table 1.

[0043] Table 1

[0044]

[0045] The above copper-silver-zinc alloy coating has a melting point of 665-775°C, a softening temperature of about 650°C, a conductivity of ≥95% IACS, a coating elongation of ≥27%, a coating refractive index of 1.2-1.5, and a reflectivity of about 78-85%. The high conductivity can ensure that the copper-silver-zinc alloy coating has good anti-electromagnetic interference capability, and the excellent coating elongation can effectively ensure that the copper-silver-zinc alloy coating is uniformly attached to the optical fiber monofilament during the subsequent preparation of the primary and secondary wires to improve the uniformity of the organization.

[0046] Some embodiments of the present invention also provide a method for preparing the copper-silver-zinc alloy, comprising the following steps:

[0047] 101. Determine the alloy composition and the corresponding proportion according to the above alloy ratio range; select the corresponding single metal material as the raw material, and accurately weigh the selected single metal to ensure that the proportion of each metal is accurate.

[0048] 102. Perform necessary pretreatment on the metal raw material to prevent the particles from being too large and remove oil, impurities and moisture. The pretreatment includes degreasing, drying and cutting. The degreasing, drying and cutting are all selected from the prior art, and the specific steps are not repeated here.

[0049] 103. Place the pretreated metal raw material into a heating furnace, turn on the heating furnace, and heat the metal raw material to 775-800°C until the metal is completely melted. A temperature below 775°C will result in insufficient melting of the metal raw material, while a temperature above 800°C will soften the optical fiber filaments, which will affect the subsequent formation of the metal coating on the optical fiber filaments. During the heating process, stir the molten metal raw material at a speed of 150-300 r / min to ensure that the metal is evenly mixed until the metal is completely dissolved and evenly distributed.

[0050] Some embodiments of the present invention also provide a method for preparing a light cone with high transmittance, crosstalk resistance and electromagnetic pulse resistance, wherein the light cone is made of tens of millions or even hundreds of millions of micron-sized fiber filaments coated with metal coatings through a specific process, and the fiber filaments are composed of a core, a cladding and an external metal coating, and each fiber independently transmits a pixel from an input end to an output end; Figure 3 As shown, the following steps are included:

[0051] 201, prepare the leather tube and the core rod into an optical fiber preform rod, and draw the optical fiber monofilament.

[0052] The step of preparing the optical fiber monofilament includes: selecting a core rod and a leather tube of suitable size, and sleeve the primary leather tube on the primary core rod, wherein the refractive index of the optical fiber skin layer at a wavelength of 532nm is 1.50-1.51; and the refractive index of the optical fiber core layer at a wavelength of 532nm is 1.80-1.81;

[0053] 202, drawing the optical fiber preform into bare optical fiber.

[0054] The optical fiber preform is heated to 810-820°C in a graphite furnace to fully soften the optical fiber preform. After the preform in the graphite furnace reaches a softened state, it is drawn into an optical fiber monofilament. In order to ensure that the drawn optical fiber monofilament has a high uniformity, the drawing speed is controlled at about 10-14m / min, which has a better effect and the diameter of the drawn optical fiber monofilament is more uniform. Too fast or too slow speed will affect the uniformity of the optical fiber monofilament, and poor uniformity of the monofilament will directly lead to a decrease in the transmittance of the light cone.

[0055] 203, then, a copper-silver-zinc alloy is coated on the surface of the bare optical fiber to form an optical fiber monofilament with a copper-silver-zinc alloy coating, and the coated optical fiber monofilament is collected by a fiber collecting device to obtain the copper-silver-zinc alloy-coated optical fiber; the copper-silver-zinc alloy-coated optical fiber is composed of an optical fiber core layer 10, an optical fiber sheath 11 and a copper-silver-zinc alloy coating 8 from the inside to the outside; wherein the refractive index of the optical fiber sheath 11 at a wavelength of 532 nm is 1.50-1.51; the refractive index of the optical fiber core layer 10 at a wavelength of 532 nm is 1.80-1.81; the thickness of the copper-silver-zinc alloy coating 8 is ≥18 μm, the refractive index at a wavelength of 532 nm is 1.2-1.5, the reflectivity at a wavelength of 532 nm is about 78-85%, and the transmittance at a wavelength of 532 nm is 40%-41%.

[0056] Among them, Figure 1 As shown, the copper-silver-zinc alloy optical fiber preparation system of the present invention comprises an optical fiber former 2, an annealing tube 3, a diameter measuring tube 4, a metal coating device 5 and an optical fiber collecting device 6 which are arranged in sequence from top to bottom; the preform 1 is fed from directly above the optical fiber former 2 and drawn into an optical fiber monofilament of 2.00 to 2.05 mm at 800 to 820° C., and then cooled to room temperature through the annealing tube 3 directly below the optical fiber former 2, and then the diameter is measured and verified through the optical fiber diameter measuring tube 4 directly below the annealing tube 3, and then the optical fiber monofilament after cooling and finalization is introduced into the metal coating device 5 for metal coating; after the coating is completed, the optical fiber monofilament after coating is collected by the optical fiber collecting device 6 below the metal coating device 5. The metal coating process is as follows: first, the copper-silver-zinc alloy particles in the metal coating device are heated to above the melting point, and then the prepared bare optical fiber is introduced into the metal coating device to start coating the bare optical fiber. The coating temperature is 775-800°C, so as to form a uniform metal coating on the outside of the optical fiber monofilament. The thickness of the metal coating is ≥18μm. The 18μm thick metal coating can not only ensure that the prepared light cone has high anti-interference, but also effectively control the preparation cost of the light cone. The coated optical fiber filament is collected by a fiber collection device. The copper-silver-zinc alloy coating on the outside of the optical fiber monofilament has a refractive index of 1.2-1.5 at a wavelength of 532nm, and a reflectivity of about 78-85% at a wavelength of 532nm, which can effectively reduce the crosstalk between optical fiber monofilaments. Under the test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz-1GHz, the shielding effectiveness is 80dB-95dB.

[0057] 204, drawing the black absorption rod into a light absorbing monofilament, and arranging the metal-plated optical fiber monofilaments in a hexagonal close-packed manner, and uniformly filling the light absorbing filaments in the gaps of the metal-plated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament (hereinafter referred to as primary filament).

[0058] The primary composite rod in this step includes metal-plated fiber monofilaments and light-absorbing fibers. The black absorption rod is made of N3 light-absorbing glass with good light-absorbing performance, and the absorption coefficient in the 500-600nm band reaches more than 0.95.

[0059] 205, multiple primary wires are arranged in a hexagonal close packing, and light absorbing single wires are inserted into the gaps formed by the multiple primary wires in a hexagonal close packing according to a certain rule. In order to ensure the transmittance of the light cone, the design is that every two fiber cores use one light absorbing wire in common by analogy with the coordination relationship, and then a primary composite rod with a side size of 27 to 30 mm is obtained. The pre-drawn wire is heated and drawn by a high-precision optical fiber forming machine, and the wire diameter drawing accuracy is ≤1μm. The primary composite rod is drawn into a primary multifilament with a side size of 1.2 to 1.5 mm at 760 to 780°C; the primary multifilament is then cut regularly, arranged in a hexagonal close packing and bundled to obtain a secondary composite rod with a side size of 27 to 30 mm; the secondary composite rod is drawn into a secondary multifilament with a side size of 1.2 to 1.5 mm at 760 to 780°C.

[0060] Among them, the primary composite rod and the secondary composite rod are both in a regular hexagonal structure. In the step of bundling multiple monofilaments after hexagonal closest arrangement to obtain a primary composite rod and the step of bundling multiple primary composite wires after hexagonal closest arrangement to obtain a secondary composite rod, it is necessary to regularly cut multiple monofilaments or primary wires and arrange them in a regular hexagonal mold. After the arrangement is completed, bundle them to obtain a primary composite rod or a secondary composite rod. The drawing temperature is 760-780°C. Under these temperature ranges, it can ensure that the optical fiber monofilament, primary multifilament, and secondary multifilament have good ductility, which is convenient for wire drawing and melt pressing; it can also effectively take into account the good ductility of the metal coating, without destroying the layer structure of the metal coating, and the primary multifilament, secondary multifilament, and the optical fiber monofilament coating in the blank also have high uniformity, which can better achieve the isolation of optical crosstalk signals and the absorption of strong electromagnetic interference, and improve the image transmission ability and anti-interference ability of the light cone.

[0061] 206, arrange the secondary multifilaments in a plate, and the size of the plate is based on the size required for actual production. After the plate is arranged, it is placed in a high-precision fiber forming machine, and drawn at 660-680° C. to obtain a molten fiber bundle according to the pixel size and shape size requirements of the light cone. According to the length requirements of the light cone, it is cut to a fixed length, and then mechanically cold processed to obtain a cylindrical light cone blank.

[0062] Among them, the melting temperature of the secondary multifilament is adjusted to 660-680°C ，Low-temperature melting and pressing within this temperature range can significantly reduce the interlayer structural damage of the metal coating caused by high temperature, while maintaining a high uniformity of the primary multifilament, secondary multifilament and optical fiber monofilament coating in the blank. The uniformity of the structure helps to more effectively isolate the optical crosstalk signal, absorb strong electromagnetic interference, and enhance the imaging transmission performance and anti-interference ability of the light cone. Too high a temperature will increase the degree of coating damage, and too low a temperature will make it impossible for the panel to be fixed and formed.

[0063] 207, the cylindrical blank is placed in a high-temperature stretching furnace, the stretching temperature is set to be in the range of 690 to 720°C, the applied stretching force is 300 to 400N, and appropriate adjustments are made according to the outer diameter and magnification index of the light cone. After the stretching is completed, it is cut from the center position to obtain two symmetrical light cone blanks.

[0064] 208. Use a precision engraving machine to perform optical finishing on the shape of the light cone. After determining the central optical axis, process the input and output end faces of the embryonic plate.

[0065] The input and output end faces are optically polished by using a machining center, and the roughness of the optical surface after polishing is controlled within 30 nm to obtain the light cone.

[0066] Some embodiments of the present invention further provide a light cone with high transmittance, crosstalk prevention and electromagnetic pulse resistance, which includes an output end, an input end and an optical fiber portion arranged between the output end and the input end; the optical fiber portion includes a plurality of copper-silver-zinc alloy-plated optical fibers, and the copper-silver-zinc alloy-plated optical fibers are, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11 and a copper-silver-zinc alloy coating 8, and light absorbing filaments 9 and interstitial filaments 7 are inserted between different copper-silver-zinc alloy-plated optical fibers. The light absorbing filaments 9 can absorb stray light, and the interstitial filaments 7 can reduce the porosity ratio, such as Figure 2 shown.

[0067] The optical properties of the obtained light cone, such as transmittance and resistance to electromagnetic pulse, were tested.

[0068] In the above technical scheme, the present invention utilizes copper-silver-zinc alloy-plated optical fiber to prepare a light cone by directly plating the optical fiber filament with a copper-silver-zinc alloy coating, arranging the single filaments, inserting light-absorbing filaments and white gap filaments for drawing, melting, pressing, and processing to form a light cone; the phenomenon that its constituent unit - the optical fiber single filament is interfered by other optical fiber filaments during the image transmission process will be significantly improved.

[0069] Some embodiments of the present invention further provide an image-intensified CCD / CMOS camera, wherein the image-intensified CCD / CMOS camera comprises the above-mentioned light cone with high transmittance, crosstalk prevention and electromagnetic pulse resistance, such as Figure 5As shown, the photosensitive surface 20 of the light cone 19 is coupled to the CCD / CMOS 21 to obtain the image-intensified CCD / CMOS camera.

[0070] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0071] Example 1

[0072] The present embodiment provides a copper-silver-zinc alloy, in which, by weight percentage, the contents of copper, silver and zinc in the copper-silver-zinc alloy are 99.995wt%, the content of copper is 15wt%, the content of silver is 65wt%, the content of zinc is 20wt%, the content of oxygen is 4.5ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is 6ppm, and the sum of the contents of other impurities is 3ppm.

[0073] Among them, the melting point of the copper-silver-zinc alloy coating is about 720°C, the softening temperature is about 650°C, the conductivity is 97.8% IACS, the coating elongation is 28.1%, the refractive index at a wavelength of 532nm is 1.28, and the reflectivity at a wavelength of 532nm is about 82%.

[0074] The preparation method of the copper-silver-zinc alloy comprises the following steps:

[0075] 101. Determine the alloy composition and the corresponding proportion according to the above alloy ratio range; select the corresponding single metal material as the raw material, and accurately weigh the selected single metal to ensure that the proportion of each metal is accurate.

[0076] 102. Perform necessary pretreatment on the metal raw material to prevent the particles from being too large and remove oil, impurities and moisture. The pretreatment includes degreasing (ultrasonic cleaning with 75% (v / v) alcohol for 20 minutes), drying (60°C, 30 minutes) and cutting (conventional). The degreasing, drying and cutting are all selected from the prior art, and the specific steps are not repeated here.

[0077] 103, placing the pretreated metal raw material into a heating furnace, and heating the metal raw material to 800°C until the metal is completely melted. During the heating process, the molten metal is stirred in time to ensure that the metal is evenly mixed until the metal is completely dissolved and evenly distributed.

[0078] The steps of preparing the light cone using the copper-silver-zinc alloy specifically include:

[0079] 201, a skin glass tube with a refractive index of 1.50, an outer diameter of 31.17mm and an inner diameter of 28mm at a wavelength of 532nm; a core glass rod with a refractive index of 1.80 and an outer diameter of 27.8mm at a wavelength of 532nm is selected, a primary glass tube is sleeved on the primary glass rod to form an optical fiber preform rod, the optical fiber preform rod is melted into an optical fiber monofilament, and a metal coating is performed, and a metal coating is plated on the outer surface to make a metal-coated optical fiber monofilament.

[0080] 202, drawing the optical fiber preform into bare optical fiber.

[0081] The optical fiber preform rod is heated to 820°C in a graphite furnace to fully soften the optical fiber preform rod. After the preform rod in the graphite furnace reaches a softened state, it is drawn into an optical fiber monofilament with a wire diameter of 3.2mm and a length of 1000mm. The drawing speed is controlled at about 12m / min.

[0082] 203, and then, the copper-silver-zinc alloy is coated on the surface of the bare optical fiber to form an optical fiber monofilament with a copper-silver-zinc alloy coating, the coating thickness of which is 18 μm, and the coated optical fiber monofilament is collected by a fiber collecting device to obtain the copper-silver-zinc alloy-coated optical fiber; the copper-silver-zinc alloy-coated optical fiber comprises, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11 and a copper-silver-zinc alloy coating 8.

[0083] Among them, Figure 1 The copper-silver-zinc alloy particles in the metal coating device shown are heated to a melting point of 790°C, and then the prepared bare optical fiber is introduced into the metal coating device to start coating the bare optical fiber. The coating temperature is 790°C, and the thickness of the copper-silver-zinc alloy coating is 18μm. The coated optical fiber filaments are collected by a fiber collection device to obtain copper-silver-zinc alloy-coated optical fiber monofilaments. The copper-silver-zinc alloy layer on the outside of the optical fiber monofilament has a refractive index of 1.28 at a wavelength of 532nm, a reflectivity of about 82% at 532nm, a transmittance of 40.65% at a wavelength of 532nm, and a coating elongation of 28.1%. Under the test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz~1GHz, the shielding effectiveness reaches 86.13dB.

[0084] 204, drawing the black absorption rod into a light absorbing monofilament, and arranging the metal-plated optical fiber monofilaments in a hexagonal close-packed manner, and uniformly filling the light absorbing filaments in the gaps of the metal-plated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament (hereinafter referred to as primary filament).

[0085] The primary composite rod in this step includes metal-plated fiber monofilaments and light-absorbing fibers. The black absorption rod is made of N3 light-absorbing glass with good light-absorbing performance, and the absorption coefficient in the 500-600nm band reaches more than 0.95.

[0086] 205, multiple primary filaments are arranged in a hexagonal close packing, and light absorbing single filaments are inserted into the gaps formed by the multiple primary filaments in a hexagonal close packing according to a certain rule, that is, one light absorbing filament is used for every two fiber cores, and then a primary composite rod with a side size of 27 mm is obtained. A high-precision optical fiber forming machine is used to heat and draw the pre-drawn parts. The primary composite rod is drawn at 780°C into a primary multifilament with a side size of 1.2 mm and a length of 1000 mm; the primary multifilament is cut regularly, arranged in a hexagonal close packing and bundled to obtain a secondary composite rod with a side size of 27 mm; the secondary composite rod is drawn at 780°C into a secondary multifilament with a side size of 1.2 mm and a length of 1000 mm.

[0087] The primary composite rod and the secondary composite rod both have a regular hexagonal structure. In the step of arranging multiple single wires in the hexagonal closest arrangement and then bundling them to obtain the primary composite rod and the step of arranging multiple primary composite wires in the hexagonal closest arrangement and then bundling them to obtain the secondary composite rod, multiple single wires or primary wires need to be cut regularly and then arranged in a regular hexagonal mold, and after the arrangement is completed, they are bundled to obtain the primary composite rod or the secondary composite rod.

[0088] 206, arrange the secondary multifilament into plates, the size of which is determined according to the actual production requirements. After the plates are arranged, they are placed in a high-precision fiber forming machine, drawn at 660°C to obtain molten fiber bundles, which are then rolled into Φ60mm cylindrical blanks, and then cut to obtain Φ60mm, 15cm long cylindrical light cone blanks.

[0089] 207, the cylindrical blank is placed in a high-temperature stretching furnace, the stretching temperature is set to 720°C, the applied stretching force is 400N, the outer diameter of the light cone is 50mm, and the magnification ratio is 5:1. After the stretching is completed, it is cut from the center position to obtain two symmetrical light cone blanks.

[0090] 208. Use a precision engraving machine to perform optical finishing on the shape of the light cone. After determining the central optical axis, process the input and output end faces of the embryonic plate.

[0091] The input and output end faces are optically polished by a machining center to obtain the light cone, which includes an output end, an input end, and an optical fiber portion arranged between the output end and the input end; the optical fiber portion includes a plurality of copper-silver-zinc alloy-plated optical fibers, and the copper-silver-zinc alloy-plated optical fibers are, from the inside to the outside, an optical fiber core layer 10, an optical fiber sheath 11, and a copper-silver-zinc alloy coating 8, and light absorbing filaments 9 and filling filaments 7 are inserted between different copper-silver-zinc alloy-plated optical fibers.

[0092] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0093] Example 2

[0094] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 2 in Table 2, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, coat the optical fiber monofilament, and test the performance of the material. The specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. The light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0095] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0096] Example 3

[0097] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 3 of Table 2, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, coat the optical fiber monofilament, and test the performance of the material. The specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. The light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0098] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0099] Example 4

[0100] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 4 of Table 2, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, coat the optical fiber monofilament, and test the performance of the material. The specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. A light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0101] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0102] Example 5

[0103] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 1, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, and the optical fiber monofilament is coated with a coating thickness as shown in Example 5 of Table 2, and the performance of the material is tested. The specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. A light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0104] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0105] Example 6

[0106] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 1, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, and the optical fiber monofilament is coated with a coating thickness as shown in Example 6 of Table 2, and the performance of the material is tested, and the specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. A light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are detailed in Table 2.

[0107] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0108] Example 7

[0109] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 1, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, and the optical fiber monofilament is coated with a coating thickness as shown in Example 7 of Table 2, and the performance of the material is tested, and the specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. A light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0110] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0111] Example 8

[0112] This embodiment provides a copper-silver-zinc alloy coating obtained by melting according to the alloy material ratio shown in Example 1, and a corresponding core glass rod and sheath glass tube to draw an optical fiber, and the optical fiber monofilament is coated with a coating thickness as shown in Example 8 in Table 2, and the performance of the material is tested, and the specific test results are shown in Table 2. The composition and proportion of the light absorbing glass are the same as those in Example 1. A light cone is prepared by referring to the method and parameters of Example 1, and the relevant parameters are shown in Table 2.

[0113] The light cone described above can be used in the preparation of an image intensified CCD camera.

[0114] The light cones obtained in Examples 1-8 were tested for transmittance and anti-electromagnetic pulse performance. The test methods are to compare the light intensity of the incident light and the outgoing light to calculate the panel transmittance; to measure at multiple frequency points of the traditional panel, record the reception value PO at each frequency, and then to measure at multiple frequency points of the embodiment with metal coating, record the reception value PI at each frequency, and calculate the shielding effectiveness of the coating light cone; the coating elongation is measured by an electronic universal testing machine.

[0115] Table 2 Alloy components of Examples 1-8 and performance test table of the coating light cone obtained by mixing

[0116]

[0117] It can be seen from the data in Table 2 that in Examples 1-8 of the present invention, the content of Cu in the copper-silver-zinc alloy coating composition of Examples 1-4 increases successively, the content of Ag decreases accordingly, the content of Zn remains unchanged, and the coating thickness is 18 μm; the copper-silver-zinc alloy coating composition of Examples 5-8 is consistent with that of Example 1, and the coating thickness increases successively by 2 μm. The copper-silver-zinc alloy coating of Examples 1-8 has a refractive index of 1.24 to 1.28 at a wavelength of 532 nm, a reflectivity of 80% to 82% at a wavelength of 532 nm, a conductivity of 95.2 to 97.8% IACS, and a coating elongation of 27.6% to 28.1%.

[0118] The transmittance of the light cone of Example 1-4 at a wavelength of 532nm is 40.01% to 40.65%; the shielding effectiveness can reach 84.74dB to 86.13dB under the test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz to 1GHz; Ag is softer in texture and has better conductivity than Cu. When there is electromagnetic pulse interference, the external copper-silver-zinc alloy coating can effectively reflect the pulse signal, and part of the pulse signal transmitted to the copper-silver-zinc alloy coating is guided out along the direction of the copper-silver-zinc alloy coating, thereby reducing the interference with the light cone transmission signal. Therefore, as the content of Ag decreases, the ability of the light cone to resist electromagnetic pulses decreases, and the conductivity and elongation of the copper-silver-zinc alloy coating also decrease; as the reflectivity of the copper-silver-zinc alloy coating decreases, the optical crosstalk between optical fibers increases slightly; at the same time, the overflow of the optical signal is also weakened, and the transmittance of the light cone is also reduced. The performance of the above light cones meets the requirements in steps 101-103 and steps 201-208.

[0119] The transmittance of the light cone of Example 5-8 at a wavelength of 532nm is 40.68% to 40.71%; the shielding effectiveness can reach 86.2dB to 86.70dB under the test environment where the radiation intensity of the electromagnetic wave is 10V / m and the radiation frequency test fluctuation range is 80MHz to 1GHz; with the increase of the thickness of the copper-silver-zinc coating, when there is electromagnetic pulse interference, the external copper-silver-zinc alloy coating can more effectively reflect the pulse signal, and guide the pulse signal transmitted to the copper-silver-zinc alloy coating along the direction of the copper-silver-zinc alloy coating, thereby reducing the interference with the light cone transmission signal. Therefore, the increase in the thickness of the copper-silver-zinc alloy coating helps to increase the light cone's ability to resist electromagnetic pulses, and the overflow of the optical signal is reduced, and the transmittance of the light cone is also increased. The increase in single transmittance and shielding effectiveness is not obvious. It can be seen that when the thickness of the copper-silver-zinc alloy coating is 18 μm, the manufactured light cone can be guaranteed to have high anti-interference performance, the performance of the light cone meets the requirements in steps 101-103 and steps 201-208, and the preparation cost of the light cone can be effectively controlled.

[0120] Comparative Example 1

[0121] According to the core and skin glass component ratios shown in Example 1, a core and skin glass rod tube is prepared, and the metal ratio is adjusted. The copper-silver-zinc coating uses a metal with a copper content of 60wt%, a silver content of 38wt%, a zinc content of 2wt%, an oxygen content of 4.8ppm, a sum of the contents of iron, nickel, sulfur and phosphorus of 8ppm, and a sum of the contents of other impurities of 6ppm. Then, the light cone preparation method of the light absorbing wire, the structural wire, etc. is inserted to prepare the light cone. Since the copper content of the copper-silver-zinc alloy coating is relatively high, and the proportion of copper and silver reaches 98wt%, the melting point of the metal is significantly increased, exceeding 950°C, and the temperature during coating needs to be increased to completely melt the copper-silver-zinc alloy coating. Since the coating temperature is too high, the optical fiber monofilament is deformed, and the complete monofilament coating process cannot be carried out, and the light cone cannot be made.

[0122] Comparative Example 2

[0123] According to the core and skin glass component ratio shown in Example 1, a core and skin glass rod tube is prepared, and then the thickness of the copper-silver-zinc coating is reduced, and a light cone preparation method is used to insert a light absorbing wire, a structural wire, etc. into an optical fiber monofilament with a copper-silver-zinc coating of 10 μm, and the remaining steps and parameters are consistent with Example 1 to prepare an anti-interference light cone. The shielding ability of the light cone of Comparative Example 2 is significantly reduced, and the shielding effectiveness is reduced to about 45 dB.

[0124] In the specification of the present invention, a lot of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some embodiments, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0125] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0126] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0127] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A copper-silver-zinc alloy, characterized in that: In terms of weight percentage, the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy is ≥99.99wt%, and the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

2. The copper-silver-zinc alloy according to claim 1, characterized in that: The oxygen content in the copper-silver-zinc alloy is less than 5ppm, the sum of the contents of iron, nickel, sulfur and phosphorus is less than 8ppm, and the sum of the contents of other impurities is less than 6ppm.

3. A method for preparing a copper-silver-zinc alloy, characterized in that: The following steps are involved: The alloy composition and the corresponding proportions are determined according to the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy being ≥ 99.99wt%, the content of copper being 15wt% to 50wt%, the content of silver being 10wt% to 80wt%, and the content of zinc being 5wt% to 40wt%; the corresponding single metal material is selected as a raw material, and the metal raw material is pretreated; the pretreated metal raw material is heated to 775 to 800° C. while stirring until the metal is completely melted and mixed evenly, so as to obtain the copper-silver-zinc alloy.

4. A method for preparing a copper-silver-zinc alloy-coated optical fiber, characterized in that: The following steps are involved: S1 draws the optical fiber preform into optical fiber bare wire; S2: coating the surface of the bare optical fiber with copper-silver-zinc alloy to form an optical fiber monofilament with a copper-silver-zinc alloy coating, and collecting the optical fiber monofilament to obtain the copper-silver-zinc alloy-coated optical fiber.

5. A copper-silver-zinc alloy-coated optical fiber, characterized in that: The copper-silver-zinc alloy-plated optical fiber comprises, from the inside to the outside, an optical fiber core layer, an optical fiber sheath and a copper-silver-zinc alloy plating layer; in terms of weight percentage, the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy plating layer is ≥ 99.99wt%, and the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

6. A light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance, characterized in that: The optical fiber comprises an output end, an input end and an optical fiber portion arranged between the output end and the input end; the optical fiber portion comprises a plurality of copper-silver-zinc alloy-plated optical fibers, the copper-silver-zinc alloy-plated optical fibers are optical fiber core layers, optical fiber sheaths and copper-silver-zinc alloy coatings from the inside to the outside, and light absorbing filaments and interstitial filaments are inserted between different copper-silver-zinc alloy-plated optical fibers; in terms of weight percentage, the sum of the contents of copper, silver and zinc in the copper-silver-zinc alloy coatings is ≥99.99wt%, the content of copper is 15wt% to 50wt%, the content of silver is 10wt% to 80wt%, and the content of zinc is 5wt% to 40wt%.

7. A method for preparing a light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance, characterized in that: The following steps are involved: a. Put the leather tube on the core rod to make an optical fiber preform; b. melting the optical fiber preform obtained in step a into an optical fiber monofilament, and performing a metal coating process to coat a metal coating on the outer surface to produce a metal-coated optical fiber monofilament; c. Drawing the black absorption rod into a light-absorbing monofilament, and arranging the metal-plated optical fiber monofilaments obtained in step b in a hexagonal close-packed manner, and uniformly filling the light-absorbing filaments in the gaps of the metal-plated optical fiber monofilaments to obtain a primary composite rod, and drawing the primary composite rod into a primary fiber filament; d. Arranging a plurality of primary fiber filaments in a hexagonal close-packed manner, and inserting a light-absorbing filament into the gaps formed by the hexagonal close-packed arrangement of the plurality of primary fiber filaments according to a certain rule to obtain a primary composite rod; drawing the primary composite rod into a primary multifilament; then regularly cutting the primary multifilament, arranging the hexagonal close-packed filaments and bundling them to obtain a secondary composite rod; drawing the secondary composite rod into a secondary multifilament; then regularly cutting the secondary multifilament, arranging the hexagonal close-packed filaments and bundling them to obtain a secondary multifilament rod; e. Drawing the secondary composite rod obtained in step d at 660-680°C to obtain a molten fiber bundle; cutting it to a fixed length and then mechanically cold working it to obtain a cylindrical blank; stretching the blank at a temperature of 780-800°C and a tensile force of 300-400N, and after stretching, cutting it from the center position to obtain two symmetrical light cone blanks; then optically finishing and optically polishing the light cone blanks to obtain the light cone with high transmittance, anti-crosstalk and resistance to high-frequency pulses.

8. The method for preparing a light cone with high transmittance, crosstalk resistance and electromagnetic pulse resistance as claimed in claim 7, characterized in that: In step a, the refractive index of the leather tube at a wavelength of 532nm is 1.50-1.51, and the refractive index of the core rod at a wavelength of 532nm is 1.80-1.81; in step c, the primary composite rod includes metal-plated fiber monofilaments and light-absorbing filaments; the black absorption rod is made of glass with an absorption coefficient of more than 0.95 in the 500-600nm band.

9. An image-intensified CCD camera, characterized in that: The image-intensified CCD camera includes the light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance as described in claim 6 above.

10. An image-intensified CMOS camera, characterized in that: The image-intensified CMOS camera includes the light cone with high transmittance, crosstalk resistance and high-frequency pulse resistance as described in claim 6 above.

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