A low-defect optical fiber panel and its preparation method and application

Abstract

The present invention relates to a low-defect optical fiber panel and its preparation method and application. The method comprises: obtaining an optical fiber bundle by melting core / skin glass, preparing preform rods, drawing single filaments, arranging primary multifilament rods, drawing primary multifilament, arranging secondary multifilament rods, drawing secondary multifilament and arranging panels; placing the optical fiber bundle in a melting and pressing environment to heat and inflate to remove contaminants on the surface of the secondary multifilament, and introducing an oxidizing gas; evacuating the melting and pressing environment to a vacuum degree of less than 10 Pa; pressurizing the melting and pressing environment and pressing the scale down to 1mm to 500mm to fuse the secondary multifilaments in the optical fiber bundle into one; after cooling the melting and pressing environment to below 100°C, demolding the optical fiber bundle and performing subsequent processing to obtain the optical fiber panel. The present invention introduces an oxidizing gas into the melting and pressing environment to clean the surface contaminants by chemical reaction or substitution at high temperature, so that the dark spot qualification rate of the optical fiber panel reaches more than 90%, and the grid qualification rate reaches more than 95%.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fibers, and in particular to a low-defect optical fiber panel and a preparation method and application thereof. Background Art

[0002] Fiber optic panels (abbreviated as fiber panels) are composed of tens of millions of micron-sized optical fibers, arranged and fused in a regular pattern. Each optical fiber is composed of a high-refractive-index core and a low-refractive-index cladding. Light is transmitted within the fiber based on the principle of total internal reflection. This fiber exhibits high resolution, a large numerical aperture, and zero optical thickness, enabling high-fidelity transmission of optical images. These panels are widely used in low-light-level image intensifiers, high-brightness, high-definition displays, optocouplers (CCDs, CMOS), and other instruments and equipment for high-definition image reception, transmission, and coupling.

[0003] The production process for optical fiber faceplates involves multiple steps, including drawing single filaments, arranging primary multifilament rods, drawing primary multifilaments, arranging secondary multifilament rods, drawing secondary multifilaments, forming panels, melting and pressing, and cold working. The melting and pressing process involves heating the bundled secondary multifilaments and applying pressure to them, causing them to fuse together to form a monolithic structure. During the melting and pressing process, contaminants on the surface of the secondary multifilaments will cause defects such as dark spots and grids after melting and pressing, seriously affecting the product's yield rate. Currently, efforts to reduce contaminants on the surface of the secondary multifilaments include improving workshop cleanliness and using brushes for cleaning, but these efforts are limited and cannot eliminate the contamination introduced by the drawing furnace and drawing wheels. These contaminants are mostly organic and have strong binding forces, requiring effective removal by decomposing them at high temperatures. Summary of the Invention

[0004] In view of this, the main purpose of the present invention is to provide a low-defect optical fiber panel and its preparation method and application. The technical problem to be solved is to introduce oxidizing gas into the melting and pressing environment, and clean the surface pollutants by chemical reaction or substitution at high temperature, so that the dark spot qualification rate of the optical fiber panel reaches more than 90% and the grid qualification rate reaches more than 95%.

[0005] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. The present invention proposes a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0006] Step 1: Obtain an optical fiber bundle by melting core / sheath glass, preparing a preform rod, drawing a single filament, arranging a primary multifilament rod, drawing a primary multifilament, arranging a secondary multifilament rod, drawing a secondary multifilament and arranging a plate;

[0007] Step 2: The optical fiber bundle is placed in a melting and pressing environment and heated. When the furnace temperature reaches 300-400°C, gas is injected and blown toward one end of the optical fiber bundle. The gas then reacts with contaminants on the surface of the secondary multifilaments when passing through the boundary of the secondary multifilaments of the optical fiber bundle, thereby removing the contaminants on the surface of the secondary multifilaments. The gas is an oxidizing gas.

[0008] Step 3: Stop the inflation, evacuate the melt-pressing environment to a vacuum degree of less than 10 Pa, and continue to heat up to the melt-pressing temperature;

[0009] Step 4: Pressurize the melting and pressing environment and press down the scale to 1mm to 500mm to fuse the secondary multifilaments in the optical fiber bundle into one;

[0010] Step 5: After cooling the melt-pressing environment to below 100° C., the optical fiber bundle is demolded and subsequently processed to obtain the optical fiber panel.

[0011] The purpose of the present invention and the solution to the technical problem are further achieved by adopting the following technical solutions.

[0012] Preferably, in the aforementioned method for preparing a low-defect optical fiber panel, in step one, the core glass is a high-refractive-index optical glass; the skin glass is a low-refractive-index optical glass; and the optical fiber bundle is a quadrangular prism, a hexagonal prism, an octagonal prism, a decagonal prism or a dodecagonal prism, with opposite side dimensions of 20 mm to 2000 mm.

[0013] Preferably, in the aforementioned method for preparing a low-defect optical fiber faceplate, in step 2, the oxidizing gas is O2 or O3; and the gas flow rate is 0.01 to 100 L / min.

[0014] Preferably, in the aforementioned method for preparing a low-defect optical fiber panel, in step four, the pressurization is gradually increased from 0.1 to 10 MPa, and the pressure is maintained for 1 to 10 minutes for each increase of 0.1 to 10 MPa, until the target pressure scale of 1 mm to 100 mm is reached.

[0015] Preferably, in the aforementioned method for preparing a low-defect optical fiber panel, in step five, the subsequent processing includes rolling it into a cylinder with a diameter of 10 to 100 mm by a rolling machine, further cutting it into a cylinder with a height of 3 to 100 mm by an inner circle cutting machine, polishing it by a polishing machine, and opening steps and chamfers by a precision engraving machine.

[0016] The objectives of the present invention and the technical problems solved therein can be further achieved by adopting the following technical measures: The present invention provides a low-defect optical fiber panel, which is manufactured by any of the above-mentioned methods.

[0017] Preferably, in the aforementioned method for preparing a low-defect optical fiber panel, the dark spot qualification rate of the low-defect optical fiber panel reaches above 90%.

[0018] Preferably, in the aforementioned method for preparing a low-defect optical fiber panel, the grid qualification rate of the low-defect optical fiber panel reaches above 95%.

[0019] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures: The present invention proposes a low-light-level image intensifier, which adopts the above-mentioned low-defect optical fiber panel.

[0020] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures: The present invention proposes a high-brightness and high-definition display, which uses the above-mentioned low-defect optical fiber panel.

[0021] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures: The present invention proposes a photoelectric coupler, which adopts the above-mentioned low-defect optical fiber panel.

[0022] Mechanism: During the drawing process, organic contaminants inevitably adhere to the surface of the secondary multifilament yarns. If not removed, these contaminants can cause dark spots and mesh defects, affecting product quality. The present invention utilizes a high-temperature oxidizing atmosphere to effectively decompose the organic contaminants and generate gases that are removed from the surface of the secondary multifilament yarns.

[0023] In the melting and pressing process of the present invention, an oxidizing gas is introduced into the gaps between the secondary multifilaments of the optical fiber panel. The oxidizing gas reacts with the organic pollutants on the surface of the secondary multifilaments at high temperature to generate gas, thereby avoiding dark spots and grid defects caused by the organic pollutants and effectively improving the qualified rate of the optical fiber panel.

[0024] Compared with the prior art, the low-defect optical fiber panel and its preparation method and application described in the present invention have the following beneficial effects:

[0025] (1) The present invention cleans the surface of the optical fiber by introducing gas during the melting and pressing process, thereby improving the qualified rate of the optical fiber panel.

[0026] (2) The present invention can be applied to the processing of optical fiber panels of various specifications, so that the dark spot qualification rate thereof reaches above 90%, and the grid qualification rate reaches above 95%.

[0027] 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 following is a detailed description of the preferred embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a process flow chart of a method for preparing a low-defect optical fiber panel according to an embodiment of the present invention;

[0029] Figure 2 This is a structural diagram of a vertical pressing mold according to an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of a horizontal pressing die according to an embodiment of the present invention;

[0031] Figure 4 This is a gas circuit diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0032] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following describes a low-defect fiber optic panel, its preparation method, and its application, along with its specific implementation, structure, features, and effectiveness, in conjunction with preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0033] The present invention will be further described below with reference to specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0034] In the following examples of the present invention, unless otherwise specified, the materials and reagents involved are commercially available products familiar to those skilled in the art; unless otherwise specified, the methods described are methods well known in the art. Unless otherwise defined, the technical or scientific terms used shall have the same meaning as those of ordinary skill in the art to which this invention belongs.

[0035] like Figure 1 As shown, some embodiments of the present invention provide a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0036] Step S1, preparing an optical fiber bundle:

[0037] (1) Melt a core glass rod with an outer diameter of 10-100 mm and a length of 300-5000 mm; melt a sheath glass tube with an inner diameter of 11-105 mm, a wall thickness of 1-10 mm, and a length of 300-5000 mm, and insert the core glass rod into the sheath glass tube to prepare an optical fiber preform rod. If the outer diameter of the core glass rod is less than 10 mm, the production efficiency is low; if the outer diameter of the core glass rod is greater than 100 mm, it is limited by equipment. If the length of the core glass rod is less than 300 mm, the production efficiency is low; if the length of the core glass rod is greater than 5000 mm, it is limited by equipment. If the inner diameter of the sheath glass tube is less than 11 mm, the production efficiency is low; if the inner diameter of the sheath glass tube is greater than 105 mm, it is limited by equipment. If the wall thickness of the sheath glass tube is less than 1 mm, the production efficiency is low; if the wall thickness of the sheath glass tube is greater than 10 mm, it is limited by equipment. If the length of the skin glass tube is less than 300 mm, the production efficiency is low; if the length of the skin glass tube is greater than 5000 mm, it is limited by the equipment.

[0038] (2) The optical fiber preform is placed in a drawing furnace for drawing, and is drawn into a single filament with a diameter of 1 to 10 mm and a length of 300 to 5000 mm. If the diameter of the single filament is less than 1 mm, the production efficiency is low; if the diameter of the single filament is greater than 10 mm, it is limited by the equipment. If the length of the single filament is less than 300 mm, the production efficiency is low; if the length of the single filament is greater than 5000 mm, it is limited by the equipment. The drawing temperature is 500°C to 1200°C, and the drawing temperature is determined by the viscosity of the glass. If the temperature is less than 700°C, the temperature is too low and the viscosity of the glass is high, and the filament cannot be drawn. If the temperature is greater than 1100°C, the temperature is too high, the viscosity of the filament is too low, and the filament diameter cannot be controlled.

[0039] (3) Arrange the monofilaments into a regular hexagon, with 2 to 15 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 10 to 75 mm and a length of 300 to 5000 mm. If the number of monofilaments is less than 2, the production efficiency is low; if the number of monofilaments is greater than 15, the equipment is limited. If the opposite side length of the primary multifilament rod is less than 10 mm, the production efficiency is low; if the opposite side length of the primary multifilament rod is greater than 75 mm, the equipment is limited. If the length of the primary multifilament rod is less than 300 mm, the production efficiency is low; if the length of the primary multifilament rod is greater than 5000 mm, the equipment is limited.

[0040] (4) The primary multifilament rod is placed in a drawing furnace for drawing to form a primary multifilament with a wire diameter of 1 to 10 mm and a length of 300 to 5000 mm. If the wire diameter of the primary multifilament is less than 1 mm, the production efficiency is low. If the wire diameter of the primary multifilament is greater than 10 mm, it is limited by the equipment. If the length of the primary multifilament is less than 300 mm, the production efficiency is low; if the length of the primary multifilament is greater than 5000 mm, it is limited by the equipment. The drawing temperature is 500°C to 1200°C, and the drawing temperature is determined by the viscosity of the glass. If the temperature is less than 500°C, the temperature is too low and the viscosity of the glass is high, and the wire cannot be drawn. If the temperature is greater than 1200°C, the temperature is too high, the viscosity of the wire is too small, and the wire diameter cannot be controlled.

[0041] (5) Arrange the primary multifilaments into a regular hexagon, with 2 to 50 strands on each side, to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 10 to 75 mm and a length of 300 to 5000 mm. If the number of primary multifilaments is less than 2, the production efficiency is low; if the number of primary multifilaments is greater than 15, the equipment is limited. If the opposite side length of the secondary multifilament rod is less than 10 mm, the production efficiency is low; if the opposite side length of the secondary multifilament rod is greater than 75 mm, the equipment is limited. If the length of the secondary multifilament rod is less than 300 mm, the production efficiency is low; if the length of the secondary multifilament rod is greater than 5000 mm, the equipment is limited.

[0042] (6) The secondary multifilament is placed in a drawing furnace for drawing, and the secondary multifilament is drawn into a wire diameter of 1 to 10 mm and a length of 300 to 5000 mm. If the wire diameter is less than 1 mm, the production efficiency is low; if the wire diameter is greater than 10 mm, it is limited by the equipment. If the wire diameter of the secondary multifilament is less than 1 mm, the production efficiency is low; if the wire diameter of the secondary multifilament is greater than 10 mm, it is limited by the equipment. If the length of the secondary multifilament is less than 300 mm, the production efficiency is low; if the length of the secondary multifilament is greater than 5000 mm, it is limited by the equipment. The drawing temperature is 500°C to 1200°C, and the drawing temperature is determined by the viscosity of the glass. If the temperature is less than 500°C, the temperature is too low and the viscosity of the glass is high, and the wire cannot be drawn. If the temperature is greater than 1200°C, the temperature is too high, the viscosity of the wire is too small, and the wire diameter cannot be controlled.

[0043] (7) Arrangement: Cut the secondary multifilament into small sections with a length of 30 to 500 mm and arrange them into regular hexagonal prisms with opposite sides of 15 to 500 mm. The specific size can be determined according to the application requirements. If the length of the small section is less than 30 mm and the opposite side is less than 15 mm, it is too short and the efficiency is low; if the length of the small section is greater than 500 mm and the opposite side is less than 15 mm, it is too large and the equipment is limited.

[0044] Step S2, mold and furnace installation: Place the fiber bundle in Figure 2 The vertical pressing die shown or Figure 3 In the horizontal pressing mold shown, Figure 2As shown, the vertical pressing mold includes a pressure cover 21, a mold sleeve 22, a slider 23, a pressure ring 24 and a base 25. The pressure cover 21 is placed on the pressure ring 24, and the base 25 is fixed to the mold sleeve 22 by screws. The slider 23 is arranged between the pressure ring 24 and the base 25. An air outlet pipe is welded at the center of the pressure cover 21, and the air outlet pipe passes through the center of the pressure cover 21. The air outlet pipe has an air outlet hole 26 at the end away from the pressure cover 21. An air inlet pipe is welded at the center of the mold sleeve 22 and the base 25, and the air inlet pipe passes through the center of the mold sleeve 22 and the base 25. The air inlet pipe has an air inlet hole 27 at the end away from the pressure cover 21. During melting and pressing, the press presses the pressure cover 21 downward, and the pressure cover 21 transfers the pressure to the pressure ring 24. The pressure ring 24 moves downward, transfers the pressure to the slider 23, and makes the slider 23 move closer to the center, thereby realizing melting and pressing of the image transmission beam. Figure 3 As shown, the horizontal pressing mold includes an upper slider 31, a middle slider 32, a lower slider 33, a side strip 34, an upper baffle 35, a lower baffle 36, an air inlet 37 and an air outlet 38; the upper baffle 35 is placed on the lower baffle 36, and the lower slider 33, the lower fiber optic panel, the middle slider 32, the upper fiber optic panel and the upper slider 31 are placed on the upper baffle 35 in sequence, and side strips 34 are respectively provided on both sides of the lower fiber optic panel and the upper fiber optic panel, and the upper baffle 35 and the lower baffle 36 are respectively welded with an air inlet pipe and an air outlet pipe at the position facing the lower fiber optic panel and the upper fiber optic panel, and the air inlet pipe and the air outlet pipe pass through the upper baffle 35 and the lower baffle 36 respectively, the air inlet pipe has an air inlet hole 37 at the end away from the upper baffle 35, and the air outlet pipe has an air outlet hole 38 at the end away from the lower baffle 36. When the horizontal pressing die is pressurized, the press applies pressure to the upper slider 31; the upper slider 31 squeezes the side strips 34 and the upper laminated fiber panel, transferring pressure to the middle slider 32; the middle slider 32 squeezes the side strips 34 and the lower fiber panel, transferring pressure to the lower slider 33. The melting die has two air holes at each end of the corresponding fiber bundle: one for air inlet and one for air outlet; there can be multiple air holes to allow gas to pass more evenly through the surface of the secondary multifilament. The melting die with the fiber bundle is then placed in the melting furnace, and the furnace temperature is raised to 300-400°C. If the temperature is below 300°C, the removal of pollutants is not ideal; if the temperature is above 400°C, it is not conducive to the discharge of pollutants.

[0045] Step S3, inflation: Figure 4 As shown, the air inlet 44 of the melting and pressing mold 43 is opened, the high-pressure gas cylinder 41 is opened, and the oxidizing gas is filled in through the high-pressure gas cylinder 41 and discharged from the air outlet 45. When the gas passes through the boundary of the secondary multifilaments of the optical fiber bundle, it reacts with the pollutants on the surface of the secondary multifilaments, and the pollutants such as polyurethane on the surface of the secondary multifilaments are removed through the oxidation reaction. However, the conventional melting and pressing process is carried out under vacuum, and the pollutants can only be carbonized at high temperature and cannot be discharged. They remain on the surface of the secondary multifilaments, forming defects such as dark spots and grids.

[0046] Step S4, heating and vacuuming: Close the high-pressure gas cylinder, stop charging, and evacuate the furnace chamber to a vacuum of less than 10 Pa to remove any residual gas from the furnace chamber and mold. The furnace chamber is then heated to the melting temperature. The specific melting temperature depends on the type of glass material; for example, it can be 650°C. If the furnace chamber vacuum exceeds 10 Pa, gas is more likely to be trapped in the fiber optic panel.

[0047] Step S5, pressurizing: pressurize the melting mold and press down the scale to 1mm~100mm to fuse the secondary multifilaments in the optical fiber bundle together; specifically, pressurize the melting mold by a mechanical press, and after the mold is subjected to force, the pressure is transmitted to the optical fiber panel, and the pressure is gradually increased from 0.1~10MPa, and the pressure is maintained for 1~10min for each increase of 0.1~10MPa, until the target downward pressure scale of 1mm~100mm is reached. If the pressure is gradually increased from greater than 10MPa, the panel segment is prone to deformation; if the pressure is gradually increased from less than 0.1MPa, the production efficiency is low; if the pressure increases by more than 10MPa each time, the pressure increase is too large each time, and the panel segment is prone to deformation; if the pressure increases by less than 1MPa each time, the pressure increase is too small each time, and the production efficiency is low; if the pressure holding time is less than 1min, the pressure holding time is too short, and the panel segment is not fully fused; if the pressure holding time is greater than 10min, the pressure holding time is too long, and the efficiency is low.

[0048] Step S6, unloading, demoulding, and processing: remove the melt pressing mold from the furnace and place it in an insulation box to cool to below 100°C; if the temperature is higher than 100°C, the plate segment will easily burst after demoulding due to the high temperature; after the melt pressing mold cools down, remove the melt pressing mold from the insulation box and demould to obtain the fiber optic panel blank, which is convenient for operation and avoids the fiber optic panel from bursting; the fiber optic panel blank undergoes subsequent processing to obtain the fiber optic panel. The subsequent processing includes: first, rolling it into a cylinder with a diameter of 10 to 100 mm by a rolling machine, then further cutting it into cylinders with a height of 3 to 100 mm by an internal circle cutting machine, and then polishing it by a polishing machine. Observe under an 8x microscope to ensure that there are no scratches on the surface. The wire diameter is determined by the previous wire drawing process. Each time the wire is drawn, the fiber optic wire diameter shrinks by a corresponding proportion. A total of three wire drawing processes are performed, and the fiber optic wire shrinks three times. For example: the diameter of the preform is d, the shrinkage ratio of the single filament is n1, the shrinkage ratio of the first multifilament is n2, and the shrinkage ratio of the second multifilament is n3, then the final optical fiber diameter = d / (n1*n2*n3)).

[0049] In some embodiments, optionally, in step S1, the core glass may be an optical glass with a refractive index of 1.5 to 2.0, and the refractive index of the core glass is higher than that of the skin glass, so that total internal reflection can occur; the skin glass may be an optical glass with a refractive index of 1.4 to 1.9; and the optical fiber bundle is a quadrangular prism, a hexagonal prism, an octagonal prism, a decagonal prism, or a dodecagonal prism, with opposite side dimensions of 20 mm to 2000 mm. Considering the convenience of plate arrangement and melting and pressing, the optical fiber bundle is generally selected as a hexagonal prism. If the opposite side dimension is less than 20 mm, the efficiency will be low; if the opposite side dimension is greater than 2000 mm, the equipment will be limited.

[0050] In some embodiments, optionally, in step S2, the melting mold is Figure 2 The vertical pressing die shown or Figure 3 The horizontal pressing die shown. A melt pressing die is used to melt and press optical bundles, squeezing the optical fiber bundle at high temperatures to fuse them together. There are two types of dies: vertical pressing and horizontal pressing. Vertical pressing involves placing the panel segments vertically, while horizontal pressing involves placing the panel segments horizontally. While vertical pressing dies apply pressure evenly to the panel segments, they also have low production efficiency and can only hold one panel segment at a time. Horizontal pressing dies can hold four panel segments at a time, but the force applied to the panels is uneven.

[0051] In some embodiments, optionally, in step S2, the vertical pressing mold has air vents at both ends; the horizontal pressing mold has air vents at both ends, and the gas enters through the air inlet and is discharged through the air outlet. The purpose of this arrangement is to pass high-temperature oxidizing gas into the secondary multifilament surface of the optical fiber bundle. The vertical pressing mold and the horizontal pressing mold are two types of molds. The so-called vertical pressing refers to the vertical placement of the plate segment, and the horizontal pressing refers to the horizontal placement of the plate segment. When the vertical pressing mold is pressurized, the plate segment is evenly stressed, but the production efficiency is low, and only one plate segment can be placed at a time; the horizontal pressing mold can place four plates at a time, but the plate segments are unevenly stressed.

[0052] In some embodiments, optionally, in step S3, the oxidizing gas is O2 or O3; the flow rate of the oxidizing gas is 0.01 to 100 L / min. If it is lower than 0.01 L / min, it will result in low efficiency; if it is higher than 100 L / min, it will cause waste. The oxidizing gas is charged in order to eliminate pollutants on the surface of the secondary multifilament. Regardless of temperature consistency, the gas temperature may be inconsistent with the furnace temperature as long as the purpose of eliminating pollutants is achieved. The temperature of the charging is between 300°C and 400°C. Within this temperature range, the oxidizing gas reacts with the pollutants to remove organic matter, and then the ventilation is stopped, the vacuum is drawn, and the furnace continues to heat up to the melting temperature. If the temperature is lower than 300°C, the organic matter will not react fully; if the temperature is higher than 400°C, the leather will easily stick together, hindering gas diffusion.

[0053] Some embodiments of the present invention further provide a low-defect fiber optic panel, produced by any of the aforementioned methods. The low-defect fiber optic panel has a dark spot pass rate exceeding 90%, an increase of more than 10% from the original 80%, and a mesh pass rate exceeding 95%, an increase of more than 15% from the original 80%.

[0054] The above-mentioned low defect means that "the dark spot qualification rate of the optical fiber panel reaches more than 90%, and the grid qualification rate reaches more than 95%."

[0055] Some embodiments of the present invention further provide a low-light-level image intensifier, which uses the low-defect optical fiber panel described above.

[0056] Some embodiments of the present invention further provide a high-brightness and high-definition display, which uses the low-defect optical fiber panel described above.

[0057] Some embodiments of the present invention further provide a photoelectric coupler, wherein the photoelectric coupler adopts the low-defect optical fiber panel described above.

[0058] The present invention will be further described below with reference to specific embodiments.

[0059] The test method for the dark spot pass rate in the following Examples 1-4 and Comparative Examples 1-2 is as follows: 16x conventional optical microscope measurement, 100 optical fiber panel samples to be tested prepared according to Example 1, Example 2, Example 3, Example 4, Comparative Example 1 or Comparative Example 2 are measured using a 16x conventional optical microscope, and the dark spots of these samples are counted, wherein the dark spot pass rate = the number of qualified dark spots / total number of samples; the qualification standards are listed in Table 1 below; if the dark spot pass rate reaches more than 90%, the requirements of the present invention are met; the test method for the grid pass rate is as follows: 100 optical fiber panel samples to be tested prepared according to Example 1, Example 2, Example 3, Example 4, Comparative Example 1 or Comparative Example 2 are measured using a 16x conventional optical microscope, and the grids of these samples are counted, wherein the grid pass rate = the number of qualified grids / total number of samples; the qualification standards are listed in Table 2 below; if the grid pass rate reaches more than 95%, the requirements of the present invention are met.

[0060] Table 1 Dark spot qualification standards

[0061] Dark spot diameter Allowed quantity 0.025~0.06mm 1 >0.06mm 0

[0062] Table 2 Grid qualification standards

[0063] Grid size Allowed quantity <0.2mm 1

[0064] Example 1

[0065] This embodiment provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0066] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face edge of 30 mm and a length of 100 mm):

[0067] (1) A core glass rod (glass grade LaK3) with an outer diameter of 29 mm and a length of 1000 mm was melted; a sheath glass tube (glass grade K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm was melted, and the core glass rod was inserted into the sheath glass tube to prepare an optical fiber preform rod with a diameter of 30 mm and a length of 500 mm.

[0068] (2) The optical fiber preform rod is placed in a drawing furnace for drawing at 1000°C into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0069] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0070] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing, and is drawn into a primary multifilament at 1000°C, with a wire diameter of 2 mm and a length of 500 mm.

[0071] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0072] (6) The secondary multifilament is placed in a wire drawing furnace for drawing at 1000° C. to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0073] (7) Arrangement: Cut the secondary multifilament into small sections with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0074] Step S2, mold installation, furnace installation, and temperature increase: Place the fiber bundle Figure 2 The vertical pressing mold shown has two air holes at the upper and lower ends, the lower end being the air inlet and the upper end being the air outlet. The mold with the optical fiber bundle is placed in the melting and pressing furnace, and the furnace is then heated to 300°C.

[0075] Step S3, filling: fill the air inlet of the melting mold with O2 (flow rate of 1 L / min, time of 60 min), and discharge it through the air outlet. The O2 flow rate is 1 L / min, and the time is 60 min.

[0076] Step S4, vacuuming: stop introducing O2 and vacuumize the furnace to a vacuum degree of 10Pa.

[0077] Step S5: Continue heating and pressurizing: Continue heating to 650°C. Pressurize the vertical pressing die, pressing it down 6mm (6mm stroke), fusing the secondary multifilaments in the fiber bundle. Specifically, a mechanical press applies pressure to the fusion pressing die. The die, under load, transmits this pressure to the fiber faceplate. The pressure gradually increases from 1 MPa, maintaining the pressure for 5 minutes for each 1 MPa increase, until the target 6 mm downward pressure is reached.

[0078] Step S6, unloading, demoulding, and processing: remove the vertical pressing mold from the furnace and place it in an insulation box to cool to room temperature. Remove the vertical pressing mold from the insulation box and demould to obtain the fiber optic panel blank. The fiber optic panel blank after demoulding is subsequently processed to obtain a finished fiber optic panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25mm by a rolling machine, then further cutting it into a cylinder with a height of 10mm by an internal circle cutting machine, polishing it by a polishing machine, and observing under an 8x microscope to ensure that there are no scratches.

[0079] Because O2 effectively removed contaminants from the secondary multifilament surface at a flow rate of 1 L / min and 300°C in this embodiment, the optical fiber panel produced in this embodiment had a higher pass rate for dark spots and mesh than conventional vertical pressing processes. The pass rate for dark spots and mesh was 91%, and the pass rate for mesh was 96%.

[0080] Example 2

[0081] This embodiment provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0082] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face of 100 mm and a length of 300 mm):

[0083] (1) Melt a core glass rod (glass grade LaK3) with an outer diameter of 29 mm and a length of 1000 mm; melt a sheath glass tube (glass grade K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm. Insert the core glass rod into the sheath glass tube to prepare an optical fiber preform with a diameter of 30 mm and a length of 500 mm.

[0084] (2) The optical fiber preform rod is placed in a drawing furnace for drawing at 1000°C into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0085] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0086] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing, and is drawn into a primary multifilament at 1000°C, with a wire diameter of 2 mm and a length of 500 mm.

[0087] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0088] (6) The secondary multifilament is placed in a wire drawing furnace for drawing at 1000° C. to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0089] (7) Arrangement: Cut the secondary multifilament into small sections with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0090] Step S2, mold installation, furnace installation, and temperature increase: Place the fiber bundle in Figure 3 The horizontal pressing mold shown has two air holes on the left and right ends, one for air inlet and the other for air outlet. The horizontal pressing mold with the optical fiber bundle is placed in the melting and pressing furnace, and the furnace is heated to 350°C.

[0091] Step S3, filling: Fill the air inlet of the melting mold with O2 and discharge it through the air outlet. The O2 flow rate is 1 L / min and the time is 60 minutes.

[0092] Step S4, vacuuming: stop introducing O2 and vacuumize the furnace to a vacuum degree of 10Pa.

[0093] Step S5: Continue heating and pressurizing: Continue heating to 650°C. Pressurize the horizontal pressing die, pressing it down 6mm (6mm stroke), fusing the secondary multifilaments in the fiber bundle. Specifically, a mechanical press applies pressure to the fusion pressing die. Once the die is pressed, the pressure is transferred to the fiber faceplate. The pressure is gradually increased by 1 MPa, with each 1 MPa increase maintained for 5 minutes until the target 6 mm downward pressure is reached.

[0094] Step S6, taking out of the furnace, demoulding, and processing: take out the horizontal pressing mold from the furnace and put it into an insulation box to cool to room temperature. Take out the horizontal pressing mold from the insulation box and demould to obtain the optical fiber panel blank. The optical fiber panel blank after demoulding is subsequently processed to obtain the finished optical fiber panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25mm by a rolling machine, and then further cutting it into a cylinder with a height of 10mm by an internal circle cutting machine, polishing it by a polishing machine, and observing under an 8x microscope to ensure that there are no scratches.

[0095] Because O2 effectively removed contaminants from the secondary multifilament surface at a flow rate of 1 L / min and 300°C in this embodiment, the optical fiber panel produced in this embodiment had a higher pass rate for dark spots and mesh than conventional cross-pressing processes. The pass rate for dark spots and mesh was 92%, and the pass rate for mesh was 96%.

[0096] Example 3

[0097] This embodiment provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0098] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face of 100 mm and a length of 300 mm):

[0099] (1) A core glass rod (glass grade LaK3) with an outer diameter of 30 mm and a length of 1000 mm was melted; a sheath glass tube (glass grade K9) with an inner diameter of 29 mm, a wall thickness of 2 mm, and a length of 1000 mm was melted, and the core glass rod was inserted into the sheath glass tube to prepare an optical fiber preform with a diameter of 30 mm and a length of 500 mm.

[0100] (2) The optical fiber preform rod is placed in a drawing furnace for drawing at 1000°C into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0101] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0102] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing, and is drawn into a primary multifilament at 1000°C, with a wire diameter of 2.5 mm and a length of 500 mm.

[0103] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0104] (6) The secondary multifilament is placed in a wire drawing furnace for drawing at 1000° C. to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0105] (7) Cut the secondary multifilament into small pieces with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0106] Step S2, mold installation, furnace installation, and temperature increase: Place the fiber bundle Figure 2 The vertical pressing mold shown has two air holes at the upper and lower ends, the lower end being the air inlet and the upper end being the air outlet. The mold with the optical fiber bundle is placed in the melting and pressing furnace, and the furnace is then heated to 300°C.

[0107] Step S3, filling: Fill the air inlet of the melting mold with O3 (flow rate of 1 L / min, time for 60 minutes), and discharge it through the air outlet. The O3 flow rate is 1 L / min, and the time is 60 minutes.

[0108] Step S4, vacuuming: stop introducing O3 and vacuumize the furnace to a vacuum degree of 10Pa.

[0109] Step S5: Continue heating and pressurizing: Continue heating to 650°C. Pressurize the vertical pressing die, pressing it down 6mm (6mm stroke), fusing the secondary multifilaments in the fiber bundle. Specifically, a mechanical press applies pressure to the fusion pressing die. The die, under load, transmits this pressure to the fiber faceplate. The pressure gradually increases from 1 MPa, maintaining the pressure for 5 minutes for each 1 MPa increase, until the target 6 mm downward pressure is reached.

[0110] Step S6, unloading, demoulding, and processing: remove the vertical pressing mold from the furnace and place it in an insulated box to cool to room temperature. Remove the vertical pressing mold from the insulated box and demould to obtain the fiber optic panel blank. The fiber optic panel blank after demoulding is subsequently processed to obtain a finished fiber optic panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25mm using a rolling machine, then further cutting it into a cylinder with a height of 10mm using an internal circle cutting machine, polishing it using a polishing machine, and observing under an 8x microscope to ensure that there are no scratches.

[0111] Compared with Example 1, the use of O3 in this embodiment has a better effect on removing pollutants on the surface of the secondary multifilament. The optical fiber panel prepared in this embodiment has a dark spot qualification rate of 92% and a grid qualification rate of 97%.

[0112] Example 4

[0113] This embodiment provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0114] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face of 200 mm and a length of 600 mm):

[0115] (1) A core glass rod (glass grade LaK3) with an outer diameter of 30 mm and a length of 1000 mm was melted; a sheath glass tube (glass grade K9) with an inner diameter of 29 mm, a wall thickness of 2 mm, and a length of 1000 mm was melted, and the core glass rod was inserted into the sheath glass tube to prepare an optical fiber preform with a diameter of 30 mm and a length of 500 mm.

[0116] (2) The optical fiber preform rod is placed in a drawing furnace for drawing into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0117] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0118] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing to form a primary multifilament with a wire diameter of 2 mm and a length of 500 mm.

[0119] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0120] (6) The secondary multifilament is placed in a wire drawing furnace for drawing to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0121] (7) Cut the secondary multifilament into small pieces with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0122] Step S2, mold installation, furnace installation, and temperature increase: Place the fiber bundle Figure 2 The vertical pressing mold shown has two air holes at the upper and lower ends, the lower end being the air inlet and the upper end being the air outlet. The mold with the optical fiber bundle is placed in the melting and pressing furnace, and the furnace is then heated to 300°C.

[0123] Step S3, filling: Fill the air inlet of the melting mold with O2 and discharge it through the air outlet. The O2 flow rate is 0.5 L / min and the time is 60 minutes.

[0124] Step S4, vacuuming: stop introducing O2 and vacuumize the furnace to a vacuum degree of 10Pa.

[0125] Step S5: Continue heating and pressurizing: Continue heating to 650°C. Pressurize the vertical pressing die, pressing it down 6mm (6mm stroke), fusing the secondary multifilaments in the fiber bundle. Specifically, a mechanical press applies pressure to the fusion pressing die. The die, under load, transmits this pressure to the fiber faceplate. The pressure gradually increases from 1 MPa, maintaining the pressure for 5 minutes for each 1 MPa increase, until the target 6 mm downward pressure is reached.

[0126] Step S6, unloading, demoulding, and processing: Remove the vertical pressing mold from the furnace and place it in an insulated box to cool to room temperature. Remove the vertical pressing mold from the insulated box and demould to obtain the fiber optic panel blank. The fiber optic panel blank after demoulding is subsequently processed to obtain the finished fiber optic panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25 mm using a rounding machine, further cutting it into cylinders with a height of 10 mm using an internal circle cutting machine, polishing it using a polishing machine, and observing it under an 8x microscope to ensure that there are no scratches.

[0127] Compared to Example 1, the O2 flow rate in this example was reduced to 0.5 L / min. The removal of contaminants from the secondary multifilament surface was not as effective as in Example 1, resulting in lower dark spot and mesh pass rates for the optical fiber panel produced in this example than in Example 1. The dark spot pass rate for the optical fiber panel produced in this example was 90%, and the mesh pass rate was 95%. However, these results were still superior to those of conventional processes.

[0128] Comparative Example 1

[0129] This comparative example provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0130] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face edge of 30 mm and a length of 100 mm):

[0131] (1) A core glass rod (glass grade LaK3) with an outer diameter of 29 mm and a length of 1000 mm was melted; a sheath glass tube (glass grade K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm was melted, and the core glass rod was inserted into the sheath glass tube to prepare an optical fiber preform rod with a diameter of 30 mm and a length of 500 mm.

[0132] (2) The optical fiber preform rod is placed in a drawing furnace for drawing at 1000°C into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0133] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0134] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing, and is drawn into a primary multifilament at 1000°C, with a wire diameter of 2 mm and a length of 500 mm.

[0135] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0136] (6) The secondary multifilament is placed in a wire drawing furnace for drawing at 1000° C. to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0137] (7) Arrangement: Cut the secondary multifilament into small sections with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0138] Step S2, mold installation, furnace installation, vacuuming, and heating: Place the optical fiber bundle in the vertical pressing mold and Figure 2 In contrast, the upper and lower ends of the vertical pressing mold have no pores. The mold with the optical fiber bundle is placed in the melting and pressing furnace, which is then vacuumed to 10Pa and the furnace is heated to 650℃.

[0139] Step S3, Pressurization: The vertical pressing die is pressurized to a 6mm mark (6mm stroke), fusing the secondary multifilaments in the fiber bundle. Specifically, a mechanical press is used to pressurize the fusion pressing die. The die, under pressure, transmits this pressure to the fiber faceplate. The pressure is gradually increased from 1 MPa, with each 1 MPa increase maintained for 5 minutes until the target 6mm mark is reached.

[0140] Step S4, unloading, demoulding, and processing: remove the vertical pressing mold from the furnace and place it in an insulation box to cool to room temperature. Remove the vertical pressing mold from the insulation box and demould to obtain the fiber optic panel blank. The fiber optic panel blank after demoulding is subsequently processed to obtain a finished fiber optic panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25 mm by a rolling machine, and then further cutting it into a cylinder with a height of 10 mm by an internal circle cutting machine, polishing it by a polishing machine, and observing under an 8x microscope to ensure that there are no scratches.

[0141] In this comparative example, no oxidizing gas was introduced, so that the pollutants on the surface of the secondary multifilaments during the melt-pressing process were not cleaned and remained in the optical fiber panel after melt-pressing, resulting in dark spots and grid defects. Therefore, the optical fiber panel prepared under this process condition had a dark spot qualification rate of 75% and a grid qualification rate of 81%.

[0142] The optical panel prepared in the above comparative example has a dark spot qualification rate of less than 80% and a grid qualification rate of less than 85%.

[0143] Comparative Example 2

[0144] This comparative example provides a method for preparing a low-defect optical fiber panel, comprising the following steps:

[0145] Step S1, preparing an optical fiber bundle (a hexagonal optical fiber bundle, with an end face of 100 mm and a length of 300 mm):

[0146] (1) A core glass rod (glass grade LaK3) with an outer diameter of 29 mm and a length of 1000 mm was melted; a sheath glass tube (glass grade K9) with an inner diameter of 30 mm, a wall thickness of 2 mm, and a length of 1000 mm was melted, and the core glass rod was inserted into the sheath glass tube to prepare an optical fiber preform with a diameter of 30 mm and a length of 500 mm.

[0147] (2) The optical fiber preform rod is placed in a drawing furnace for drawing at 1000°C into a single wire with a wire diameter of 3 mm and a length of 500 mm.

[0148] (3) Arrange the monofilaments into a regular hexagon, with 6 monofilaments on each side, to form a primary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0149] (4) The primary multifilament rod is placed in a wire drawing furnace for wire drawing, and is drawn into a primary multifilament at 1000°C, with a wire diameter of 2 mm and a length of 500 mm.

[0150] (5) The primary multifilaments are arranged into a regular hexagon to form a secondary multifilament rod, which is a regular hexagonal prism with opposite sides of 30 mm and a length of 500 mm.

[0151] (6) The secondary multifilament is placed in a wire drawing furnace for drawing at 1000° C. to form a secondary multifilament with a wire diameter of 1 mm and a length of 150 mm.

[0152] (7) Arrangement: Cut the secondary multifilament into small sections with a length of 30 mm and arrange them into a regular hexagonal prism with opposite sides of 150 mm.

[0153] Step S2, mold installation, furnace installation, vacuuming, and heating: Place the optical fiber bundle in the horizontal pressing mold and Figure 3 In contrast, there are no pores on the left and right ends of the horizontal pressing mold. The horizontal pressing mold with the optical fiber bundle is placed in the melting and pressing furnace, vacuumed to 10Pa, and the furnace is heated to 650℃.

[0154] Step S3, Pressurization: The horizontal pressing die is pressurized to a 6mm mark (6mm stroke), fusing the secondary multifilaments in the optical fiber bundle. Specifically, the fusion pressing die is pressurized using a mechanical press. The die, under pressure, transmits this pressure to the optical fiber faceplate. The pressure is gradually increased by 1 MPa, with each 1 MPa increase maintained for 5 minutes until the target 6mm mark is reached.

[0155] Step S4, taking out of the furnace, demoulding, and processing: take out the horizontal pressing mold from the furnace and put it into an insulation box to cool to room temperature. Take out the horizontal pressing mold from the insulation box and demould to obtain the optical fiber panel blank. The optical fiber panel blank after demoulding is subsequently processed to obtain the finished optical fiber panel. The subsequent processing includes: rolling it into a cylinder with a diameter of 25mm by a rolling machine, and then further cutting it into a cylinder with a height of 10mm by an internal circle cutting machine, polishing it by a polishing machine, and observing under an 8x microscope to ensure that there are no scratches.

[0156] In this comparative example, no oxidizing gas was introduced, so that the pollutants on the surface of the secondary multifilaments during the melting and pressing process were not cleaned and remained in the optical fiber panel after melting and pressing, resulting in dark spots and grid defects. Therefore, the optical fiber panel prepared under this process condition had a dark spot qualification rate of 78% and a grid qualification rate of 83%.

[0157] The optical panels prepared in the comparative example above had a dark spot qualification rate of less than 80% and a grid qualification rate of less than 85%. This is because the surface of the secondary multifilaments is inevitably contaminated by the workshop environment and the drawing furnace during the drawing process. The contaminants in the subsequent melting and pressing process cause dark spots and grid defects in the optical fiber panels.

[0158] In the description of the present invention, a large number 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 description.

[0159] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0160] In addition, the 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.

[0161] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a low-defect optical fiber panel, characterized in that: The following steps are involved: Step 1: Obtain an optical fiber bundle by melting core glass and sheath glass, preparing a preform rod, drawing a single filament, arranging a primary multifilament rod, drawing a primary multifilament, arranging a secondary multifilament rod, drawing a secondary multifilament and arranging a plate; Step 2: The optical fiber bundle is placed in a melting and pressing environment and heated. When the furnace temperature reaches 300-400°C, gas is injected and blown toward one end of the optical fiber bundle. The gas then reacts with contaminants on the surface of the secondary multifilaments when passing through the boundary of the secondary multifilaments of the optical fiber bundle, thereby removing the contaminants on the surface of the secondary multifilaments. The gas is an oxidizing gas. Step 3: Stop the inflation, evacuate the melt-pressing environment to a vacuum degree of less than 10 Pa, and continue to heat up to the melt-pressing temperature; Step 4: Pressurize the melting and pressing environment, and press down the scale to 1mm to 100mm to fuse the secondary multifilaments in the optical fiber bundle into one; the pressure is gradually increased from 0.1 to 10MPa, and the pressure is maintained for 1 to 10 minutes for each increase of 0.1 to 10MPa until the target pressure scale of 1mm to 100mm is reached; Step 5: After cooling the melt-pressing environment to below 100° C., the optical fiber bundle is demolded and subsequently processed to obtain the optical fiber panel.

2. The method for preparing a low-defect optical fiber panel according to claim 1, wherein: In step 1, the core glass is a high-refractive-index optical glass; the skin glass is a low-refractive-index optical glass; and the optical fiber bundle is a quadrangular prism, a hexagonal prism, an octagonal prism, a decagonal prism, or a dodecagonal prism, with opposite side dimensions ranging from 20 mm to 2000 mm.

3. The method for preparing a low-defect optical fiber panel according to claim 1, wherein: In step 2, the oxidizing gas is O2 or O3; the flow rate of the gas is 0.01 to 100 L / min; the oxidizing gas reacts with the pollutants on the surface of the secondary multifilaments to eliminate the pollutants on the surface of the secondary multifilaments.

4. The method for preparing a low-defect optical fiber panel according to claim 1, wherein: In step five, the subsequent processing includes rolling it into a cylinder with a diameter of 10 to 100 mm by a rolling machine, further cutting it into a cylinder with a height of 3 to 100 mm by an inner circle cutting machine, polishing it by a polishing machine, and stepping and chamfering it by a precision engraving machine.

5. A low-defect optical fiber panel, characterized in that: The low-defect optical fiber panel is manufactured by the method according to any one of claims 1-4.

6. The low-defect optical fiber panel according to claim 5, wherein: The dark spot qualification rate of the low-defect optical fiber panel reaches more than 90%; the grid qualification rate of the low-defect optical fiber panel reaches more than 95%.

7. A low-light-level image intensifier, characterized in that: The low-light-level image intensifier adopts the low-defect optical fiber panel according to claim 5 or 6.

8. A high brightness and high definition display, characterized in that: The high-brightness and high-definition display adopts the low-defect optical fiber panel according to claim 5 or 6.

9. A photoelectric coupler, characterized in that: The photoelectric coupler adopts the low-defect optical fiber panel according to claim 5 or 6.

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