Fusion pressing die for optical fiber faceplate, and optical fiber faceplate, fusion pressing method therefor and use thereof

Abstract

The present invention provides a fusion pressing die for an optical fiber faceplate, and an optical fiber faceplate, a fusion pressing method therefor and a use thereof. The fusion pressing die comprises: a pressing plate; and an auxiliary heater provided on the surface of one side of the pressing plate, wherein when the fusion pressing die performs fusion pressing on an optical fiber bundle, the auxiliary heater is provided opposite and parallel to two end faces of the optical fiber bundle. The technical problem to be solved is how to provide the fusion pressing die for the optical fiber faceplate, and the optical fiber faceplate, the fusion pressing method therefor and the use thereof, such that the optical fiber bundle does not need to be subjected to long-term heat preservation during fusion pressing, thereby improving product performance and process efficiency.

Description

Optical fiber panel melting die, optical fiber panel, melting method and application thereof Technical Field

[0001] The present invention belongs to the technical field of optical fibers, and in particular relates to a melting and pressing die for an optical fiber panel, an optical fiber panel, a melting and pressing method thereof, and an application thereof. Background Art

[0002] The preparation process of the optical fiber panel requires drawing single filaments, arranging primary multifilament rods, drawing primary multifilaments, arranging secondary multifilament rods, drawing secondary multifilaments and arranging plates in sequence to obtain optical fiber bundles; the obtained optical fiber bundles are subjected to multiple processes such as melt pressing and cold processing to finally produce optical fiber panels.

[0003] Melting and pressing is one of the important processes. In the prior art, melting and pressing requires the use of a melting and pressing mold, a heating furnace and a press. The melting and pressing mold can be a vertical pressing mold or a horizontal pressing mold. The vertical pressing mold includes: a pressing plate (the pressing plate includes a pressure cover and a base), a mold sleeve, a number of sliders and a pressing ring; the horizontal pressing mold includes: a pressing plate (the pressing plate includes an upper baffle and a lower baffle), a side baffle, an upper slider, a middle slider, a lower slider and a side strip. The use method of the vertical pressing mold is basically the same as that of the horizontal pressing mold. Taking the vertical pressing mold as an example, during the preparation process, the optical fiber bundle needs to be placed in the melting and pressing mold, and then the optical fiber bundle and the melting and pressing mold are placed as a whole in the furnace of the heating furnace and heated. Then, a press is used to transfer the pressure to the pressure cover, which presses the pressure ring downward, and the pressure ring presses the slider. After being pressed, the slider moves toward the center and presses the optical fiber panel, thereby achieving melting and pressing. After the heating in the furnace is completed, it still needs to be kept warm for more than 1 to 2 hours to avoid temperature differences between the outside and inside of the optical fiber bundle. However, the existing technology has the following defects: first, the insulation time is long, resulting in low manufacturing process efficiency; second, the insulation temperature is high, and the optical fiber bundle stays in this high-temperature environment for too long, resulting in severe core-sheath diffusion and material crystallization, ultimately leading to a decline in product performance.

[0004] Summary of the Invention

[0005] The main purpose of the present invention is to provide a melting and pressing mold for an optical fiber panel, an optical fiber panel, a melting and pressing method and application thereof. The technical problem to be solved is how to provide a melting and pressing mold for an optical fiber panel, an optical fiber panel, a melting and pressing method and application thereof, so that the optical fiber bundle does not need to be kept warm for a long time during the melting and pressing process, thereby improving product performance and process efficiency.

[0006] The purpose of the present invention and the technical problem solved are achieved by adopting the following technical solutions. According to the present invention, a fiber panel melting die is proposed for melting and pressing a fiber bundle, which includes:

[0007] pressure plate;

[0008] The auxiliary heater is arranged on one side surface of the pressing plate; when the melting and pressing mold melts and presses the optical fiber bundle, the auxiliary heater is opposite to the two end surfaces of the optical fiber bundle.

[0009] Preferably, the aforementioned melting and pressing mold is a horizontal pressing mold; the pressing plate includes an upper baffle and a lower baffle; the auxiliary heater is provided on the surface opposite to the end face of the optical fiber bundle of the upper baffle and / or the lower baffle; or,

[0010] The melting and pressing mold is a vertical pressing mold; the pressing plate includes a base and a pressing cover; an auxiliary heater is provided on the surface of the base and / or the pressing cover opposite to the end face of the optical fiber bundle.

[0011] Preferably, in the aforementioned melting mold, the auxiliary heater is an infrared light emitter and / or an infrared light emitting material; the emissivity of the infrared light emitting material is greater than 0.9; the wavelength of the infrared light emitted by the infrared light emitter is 1 to 4 μm, and the power emitted by the infrared light emitter is 1 kw to 15 kw.

[0012] Preferably, in the aforementioned melting and pressing mold, the infrared light emitting material is selected from at least one of graphite, concrete, glass, asbestos board and clay.

[0013] Preferably, in the aforementioned melting die, the surfaces of the upper baffle and the lower baffle facing the end surface of the optical fiber bundle are concave arc surfaces; the concave depth of the concave arc surface is 5 to 50 mm; or,

[0014] The surfaces of the base and the pressure cover facing the end surface of the optical fiber bundle are concave arc surfaces; the concave depth of the concave arc surface is 5 to 50 mm.

[0015] The purpose of the present invention and the solution to its technical problems are also achieved by adopting the following technical solutions. According to the present invention, a method for melting and pressing an optical fiber panel is proposed, which includes the following steps:

[0016] The optical fiber bundle after the plate arrangement is placed in the melting mold;

[0017] Heating the melting and pressing mold containing the optical fiber bundle; the heating at least includes auxiliary heating of both end faces of the optical fiber bundle by an auxiliary heater;

[0018] Keep warm for 0 to 30 minutes and apply pressure.

[0019] Preferably, in the aforementioned melt-pressing method, the auxiliary heater is controlled to emit infrared light with a wavelength of 1 to 4 μm; the power of the auxiliary heater is 1 kW to 15 kW; and the melt-pressing mold equipped with the optical fiber bundle is heated at a heating temperature of 600 to 700°C.

[0020] Preferably, in the aforementioned melt pressing method, the optical fiber bundle is fire-polished until the outer surfaces of both ends of the optical fiber bundle are convex arc surfaces with a protruding length of 5 to 50 mm, and then placed into a melt pressing mold.

[0021] The purpose of the present invention and the technical problems solved therein are also achieved by the following technical solutions: According to the present invention, a fiber optic panel is proposed, which can absorb light with a wavelength of 1 to 4 μm; the fiber optic panel is manufactured by the above-mentioned fiber optic panel melt pressing method.

[0022] The purpose of the present invention and the technical problems solved therein are also achieved by adopting the following technical solutions: A low-light-level image intensifier proposed in the present invention includes the above-mentioned optical fiber panel.

[0023] By means of the above technical solution, the present invention provides a fiber optic panel fusion die, a fiber optic panel, a fusion fusion method, and an application thereof, which have at least the following advantages:

[0024] The melting and pressing mold described in the present invention is equipped with an auxiliary heater, which can be an infrared light emitting material or an infrared light emitter provided on the pressing plate. When the auxiliary heater is an infrared light emitting material, the infrared light emitting material can effectively transfer the heat on the pressing plate to the interior of the optical fiber bundle, thereby reducing the temperature difference between the interior and exterior of the optical fiber bundle. When the auxiliary heater is an infrared light emitter, during the melting and pressing process, the infrared light emitter is controlled to emit infrared light with a wavelength of 1 to 4 μm, so that the optical fiber bundle absorbs the energy of the infrared light. Then, by adjusting the power of the infrared light emitter between 1 and 15 kW, the infrared light can generate sufficient energy to heat the interior of the optical fiber bundle, thereby further reducing the temperature difference between the interior and exterior of the optical fiber bundle.

[0025] The melt-pressing die designed in this invention significantly reduces the temperature difference between the inside and outside of the optical fiber bundle during the melt-pressing process, thereby shortening the holding time. This not only helps avoid performance variations between different locations of the resulting optical fiber faceplate, but also improves the consistency of its performance. Furthermore, the melt-pressing die helps reduce core-to-skin diffusion and crystallization, thereby improving production efficiency.

[0026] 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 with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of a vertical pressing mold of the present invention;

[0028] FIG2 is a schematic diagram of a horizontal pressing die of the present invention;

[0029] FIG3 is a side view of the horizontal pressing die of the present invention;

[0030] FIG4 is a schematic diagram of the arc surface of the gland of the present invention;

[0031] FIG5 is a schematic diagram of the arc surface of the base of the present invention;

[0032] FIG6 is a schematic diagram of the position of the auxiliary heater of the present invention;

[0033] FIG7 is a schematic diagram of a melting mold of the present invention;

[0034] FIG8 is a schematic diagram of the process flow of preparing an optical fiber bundle according to the present invention;

[0035] FIG9 is a schematic diagram of the conduction of infrared light inside an optical fiber according to the present invention;

[0036] FIG10 is a schematic diagram of the radiation wavelengths of graphite at different temperatures according to an embodiment of the present invention;

[0037] FIG11 is a schematic diagram of the end face of the optical fiber bundle in the vertical pressing mold;

[0038] FIG12 is a schematic diagram of the end face of the optical fiber bundle in the horizontal pressing mold;

[0039] FIG13 is a schematic diagram of the depression depth;

[0040] FIG14 is a schematic diagram of a fiber bundle fire-throwing. DETAILED DESCRIPTION

[0041] To further illustrate the technical means and effectiveness of the present invention in achieving its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of a fiber optic panel fusion die, a fiber optic panel, a fusion fusion method, and applications thereof, as well as their specific implementations, structures, features, and effectiveness. 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.

[0042] The present invention provides a fiber panel melting and pressing mold for melting and pressing a fiber bundle, as shown in Figures 1 to 14, which includes:

[0043] pressure plate;

[0044] An auxiliary heater is provided on one side surface of the pressing plate; when the melting mold melts the optical fiber bundle, the auxiliary heater is opposite to the two end surfaces of the optical fiber bundle; the auxiliary heater is an infrared light emitter and / or an infrared light emitting material; the emissivity of the infrared light emitting material is greater than 0.9; the wavelength of the infrared light emitted by the infrared light emitter is 1 to 4 μm, and the power emitted by the infrared light emitter is 1 kW to 15 kW.

[0045] The pressure plate structure of the present invention needs to be selected according to the type of the melting and pressing mold. When the melting and pressing mold is a horizontal pressing mold, the pressure plate consists of an upper baffle and a lower baffle; when the melting and pressing mold is a vertical pressing mold, the pressure plate consists of a base and a pressure cover.

[0046] During use, the molten pressing mold of the present invention needs to be heated in a heating furnace. As shown in FIG7 , the molten pressing mold 17 is placed in a heating furnace 15 for heating. During the heating process, the auxiliary heater plays an auxiliary heating role. During the heating process, the press 14 applies downward pressure to perform the molten pressing operation.

[0047] The present invention is provided with an auxiliary heater, which is arranged on one side surface of the pressing plate. Taking the vertical pressing mold as an example, as shown in Figure 6, the auxiliary heater 13 is arranged on the side of the pressing cover 1 and the base 5, opposite to the end face of the optical fiber bundle 16; this design allows direct transmission to the inside of the optical fiber bundle, thereby heating the inside of the optical fiber bundle, enabling the optical fiber bundle to reach the required temperature more quickly during the melting and pressing process, overcoming the defect that the optical fiber bundle needs to be kept warm for a long time due to the large temperature difference between the inside and outside during the melting and pressing process, thereby improving process efficiency, and reducing the risk of the optical fiber bundle staying in a high-temperature environment for too long, resulting in serious core-skin diffusion, material crystallization, and ultimately leading to a decline in product performance.

[0048] The auxiliary heater described in the present invention performs auxiliary heating on the basis of heating in a heating furnace. The existing melting and pressing mold is not provided with an auxiliary heater. Heat is transferred from the furnace wall of the heating furnace to the outer surface of the optical fiber bundle, and then the heat is transferred to the inside of the optical fiber bundle through the thermal conductivity of the optical fiber bundle itself. The efficiency of this heat transfer is too slow, so a longer insulation time is required to ensure that sufficient heat is transferred to the inside of the optical fiber bundle. The present invention is provided with an auxiliary heater. The auxiliary heater emits infrared rays to the inside of the optical fiber bundle on the basis of heating in a heating furnace. The optical fiber bundle absorbs the infrared rays to achieve heating, thereby reducing the temperature difference between the inside and outside of the optical fiber bundle, thereby improving production efficiency.

[0049] The auxiliary heater described in the present invention can be an infrared light emitting material. The material of the infrared light emitting material needs to be selected to have an emissivity greater than 0.9. This is because when any object is above absolute zero (-273.15°C), infrared rays (also known as infrared energy) will be emitted from its surface. The higher the temperature, the stronger the emitted infrared energy. Therefore, the infrared light emitting material with an emissivity greater than 0.9 provided in the present invention can release the infrared rays of the pressing plate. The radiated infrared rays are irradiated to the upper and lower ends of the optical fiber panel. As shown in FIG9 , the radiated infrared rays propagate along the optical fiber. The interior of the optical fiber bundle 16 can effectively absorb and utilize these infrared rays to achieve heating of the interior of the optical fiber bundle. Such a design can significantly reduce the temperature difference between the inside and outside of the optical fiber bundle, overcome the defect that the optical fiber bundle needs to be kept warm for a long time during the melting and pressing process due to the large temperature difference between the inside and outside, thereby improving process efficiency.

[0050] The infrared light emitting material can be provided as a coating, or as a high-temperature radiation coating, applied to the surface of the press plate to form a coating. Alternatively, it can be provided as a block of infrared light emitting material and embedded in the surface of the press plate. For example, if the infrared light emitting material is graphite, a graphite coating can be prepared from it and applied to the surface of the press plate to form a coating. Alternatively, the graphite can be provided as a graphite sheet and embedded in the surface of the press plate. The shape of the graphite sheet can be a rectangular parallelepiped, a cube, or a cylinder. The specific shape of the graphite coating or the graphite sheet can be adjusted according to actual production needs. Preferably, the infrared light emitting material is provided as a coating. When the infrared light emitting material is provided as a coating, the thickness of the coating is 0.01 mm to 0.5 mm. When the infrared light emitting material is provided as a block of infrared light emitting material, the thickness of the block of infrared light emitting material is 0.1 mm to 10 mm.

[0051] It needs to be further explained that the emissivity mentioned in the present invention means the ratio of the heat radiated per unit area of ​​an object to the heat radiated by a black body at the same temperature and under the same conditions.

[0052] The auxiliary heater described in the present invention can also be an infrared light emitter capable of emitting infrared light with a wavelength of 1 to 4 μm. The wavelength of the infrared light is controlled because different optical fiber bundles can absorb different wavelengths of light. The optical fiber bundle involved in the present invention is a conventional optical fiber bundle that can absorb infrared light in the range of 1 to 4 μm. Therefore, in order for the optical fiber bundle to effectively absorb infrared light, it is necessary to ensure that the wavelength emitted by the infrared emitter is within this range.

[0053] The present invention also controls the power of the infrared emitter to be 1kw to 15kw. The infrared emitter is directly related to the energy of the infrared light. The greater the power, the higher the energy of the infrared light. In this way, the inside of the optical fiber bundle can receive more heat, thereby better heating. Such a design can significantly reduce the temperature difference between the inside and outside of the optical fiber bundle, and overcome the defect that the optical fiber bundle needs to be kept warm for a long time during the melting and pressing process due to the large temperature difference between the inside and outside, thereby improving process efficiency. In addition, the present invention can also control the internal temperature of the optical fiber bundle by controlling the power of the infrared emitter, thereby achieving precise control of the temperature difference between the inside and outside of the optical fiber bundle, and overcoming the defect that the optical fiber bundle needs to be kept warm for a long time during the melting and pressing process due to the large temperature difference between the inside and outside, thereby improving process efficiency.

[0054] The number of infrared emitters can be one or more. When there are multiple infrared emitters, they can work together to inject infrared light into the interior of the fiber bundle in parallel. This design helps ensure uniform and efficient heating within the fiber bundle. In addition, multiple infrared emitters can also combine multiple beams of infrared light into a single beam, which is injected into the fiber bundle in a concentrated manner. This method can increase the energy density of the infrared light, thereby achieving faster and deeper heating of the fiber bundle. Whether parallel or concentrated irradiation, the purpose is to overcome the defect of the fiber bundle requiring long-term heat preservation due to the large temperature difference between the inside and outside during the melting and pressing process, thereby improving process efficiency.

[0055] Preferably, the aforementioned melting and pressing mold is a vertical pressing mold; the pressing plate includes a base and a pressure cover; an auxiliary heater is provided on the surface opposite to the end face of the base and / or the pressure cover and the end face of the optical fiber bundle.

[0056] The melting and pressing mold described in the present invention is improved on the basis of the existing vertical pressing mold. As shown in Figures 1, 4 and 5, the melting and pressing mold includes a pressure cover 1, a mold sleeve 2, a slider 3, a pressure ring 4, a base 5 and an auxiliary heater 13. The auxiliary heater 13 can be arranged on the base 5 and / or the pressure cover 1. In order to better achieve the heating inside the optical fiber bundle, preferably, the auxiliary heater 13 can be arranged on the base 5 and the pressure cover 1 at the same time; this is because the infrared light will be absorbed by the optical fiber bundle during the propagation process. If the auxiliary heater 13 is only set on one side, it may cause a temperature difference between the two ends of the optical fiber bundle. By setting the auxiliary heater 13 on both the base 5 and the pressure cover 1, the heating of the two end faces of the optical fiber bundle can be made more uniform, preventing the temperature difference between the two ends of the optical fiber bundle, thereby avoiding the performance difference at different positions of the optical fiber panel, and improving the consistency of the performance of the optical fiber panel.

[0057] It needs to be further explained that auxiliary heaters are provided on the surfaces of the base and / or the gland opposite to the end faces of the optical fiber bundle; wherein the end faces of the optical fiber bundle 16 are the upper and lower ends, as shown in FIG11 .

[0058] It needs to be further explained that the opposite surfaces mentioned in the vertical pressing mold of the present invention refer to the sides of the base and the pressing cover that are closest to the optical fiber bundle, as shown in FIG6 .

[0059] Preferably, the aforementioned melting and pressing mold is a horizontal pressing mold; the pressing plate includes an upper baffle and a lower baffle; the auxiliary heater is provided on the opposite surface of the upper baffle and / or the lower baffle and the end face of the optical fiber bundle.

[0060] The fusion pressing mold of the present invention is an improvement on the existing horizontal pressing mold. As shown in Figures 2 and 3, the fusion pressing mold includes an upper baffle 6, side baffles 7, a lower baffle 8, an upper slider 9, a middle slider 10, a lower slider 11, and side bars 12. Auxiliary heaters are provided on the sides of the upper baffle and / or the lower baffle.

[0061] The auxiliary heater is provided on the surface of the upper baffle and / or the lower baffle opposite to the end surface of the optical fiber bundle; wherein the end surfaces of the optical fiber bundle 16 are the left and right ends, as shown in FIG12 .

[0062] It needs to be further explained that, similar to the principle of the vertical pressing mold described in the present invention, the opposite surfaces described in the horizontal pressing mold of the present invention refer to the sides of the upper baffle and the lower baffle that are closest to the optical fiber bundle.

[0063] Preferably, in the aforementioned melting mold, the auxiliary heater is an infrared light emitter and / or an infrared light emitting material; the emissivity of the infrared light emitting material is greater than 0.9; the wavelength of the infrared light emitted by the infrared light emitter is 1 to 4 μm, and the power emitted by the infrared light emitter is 1 kw to 15 kw.

[0064] The infrared light emitting material described in the present invention must have an emissivity greater than 0.9. If the emissivity is less than 0.9, the emitted infrared light will not be absorbed by the optical fiber bundle, resulting in the auxiliary heater failing to heat the material. Therefore, the emissivity of the infrared light emitting material must be greater than 0.9. The choice of emissivity also depends on the melt-pressing heating temperature. For example, graphite has an emissivity of 0.98. At a melt-pressing temperature of 600-700°C, as shown in Figure 10, the wavelength of the radiated infrared light is approximately 2.9 μm.

[0065] The auxiliary heater of the present invention may have an infrared light emitting material at one end and an infrared emitter at the other end; preferably, both ends are infrared light emitting materials or infrared emitters.

[0066] The auxiliary heater of the present invention may have a coating at one end and an infrared light emitting material block at the other end; preferably, both ends are infrared light emitting material blocks or coatings.

[0067] Preferably, in the aforementioned melting and pressing mold, the infrared light emitting material is selected from at least one of graphite, concrete, glass, asbestos board and clay.

[0068] The infrared light emitting material described in the present invention can be any material, as long as it has an emissivity greater than 0.9, such as commonly available high-temperature radiant coatings. When using a high-temperature radiant coating as the infrared light emitting material, it can be applied to the press plate to form a coating for it to function. The infrared light emitting material described in the present invention can be selected from at least one of graphite, concrete, glass, asbestos board, and clay, all of which are commonly available. Preferably, the infrared light emitting material is graphite.

[0069] Preferably, in the aforementioned melting mold, the surfaces of the base and the pressure cover facing the end face of the optical fiber bundle are concave arc surfaces; the concave depth of the concave arc surfaces is 5 to 50 mm; the surfaces of the upper baffle and the lower baffle facing the end face of the optical fiber bundle are concave arc surfaces; the concave depth of the concave arc surfaces is 5 to 50 mm.

[0070] The base, pressure cover, upper baffle and lower baffle described in the present invention can all be designed to be arc-shaped, as shown in Figures 4 and 5. The auxiliary heater 13 is arranged on the arc-shaped surface of the pressure cover 1 and the base 5, and the depth of the arc surface depression is controlled to be 5 to 50 mm. The depth of the arc surface depression is controlled to enable the infrared light emitted by the infrared light emitting material or the infrared generator to be gathered into a beam of light, which is emitted into the interior of the optical fiber bundle in a concentrated manner, thereby increasing the energy density of the infrared light, thereby achieving faster and deeper heating of the optical fiber bundle.

[0071] As shown in FIG13 , the concave depth described in the present invention refers to the distance between the top and bottom of the arc surface.

[0072] Preferably, in the aforementioned melting and pressing mold, the wavelength of the infrared light emitted by the infrared light emitter is 2 to 3 μm.

[0073] The wavelength of the infrared light described in the present invention is preferably 2-3 μm. Within this wavelength range, infrared light is more easily absorbed by the optical fiber bundle. Therefore, by controlling the wavelength of the infrared light within the 2-3 μm range, the infrared light energy can be maximized, achieving more efficient and uniform heating of the optical fiber bundle. This can significantly reduce the temperature difference between the inside and outside of the optical fiber bundle, overcoming the drawback of the optical fiber bundle requiring long-term heat preservation due to the large temperature difference between the inside and outside during the melting and pressing process, thereby improving process efficiency.

[0074] The present invention also provides a method for melting and pressing an optical fiber panel, which comprises the following steps:

[0075] The optical fiber bundle after the plate arrangement is placed in the melting mold;

[0076] Heating the melting and pressing mold containing the optical fiber bundle; the heating at least includes auxiliary heating of both end faces of the optical fiber bundle by an auxiliary heater;

[0077] Keep warm for 0 to 30 minutes and apply pressure.

[0078] As shown in Figure 8, the optical fiber bundle of the present invention is produced by sequentially drawing single filaments, arranging primary multifilament rods, drawing primary multifilaments, arranging secondary multifilament rods, drawing secondary multifilaments, and forming plates. The resulting optical fiber bundle is 200 to 600 mm long and arranged in a regular hexagonal prism shape with a side length of approximately 20 to 1000 mm. The optical fiber bundle is made of a conventional material capable of absorbing infrared light with a wavelength of 1 to 4 μm, for example, the core glass rod is model H-LaK3 and the sheath glass tube is model H-K9. After a series of processing, the resulting optical fiber bundle is obtained. In addition, other optical fiber bundles capable of absorbing wavelengths of 1 to 4 μm can also be processed using the mold described in the present invention.

[0079] Compared to existing melting and pressing dies, when preparing large-area fiber optic panels, the existing melting and pressing dies have the problem that the fiber bundle after panel arrangement is too large. During the melting and pressing process, heat cannot be quickly transferred to the interior of the fiber bundle, resulting in a temperature difference between the inside and outside, which ultimately leads to a decrease in product quality. However, the present invention provides an auxiliary heater that can directly transmit infrared light to the interior of the fiber bundle, achieving auxiliary heating of the interior of the fiber bundle. Therefore, when using the melting and pressing dies described in the present invention to prepare large-area fiber optic panels, the defect of requiring long-term heat preservation due to the large temperature difference between the inside and outside can be reduced, thereby improving process efficiency.

[0080] It is important to further explain that the core glass rod and skin glass tube models refer to specific optical glass grades. As an identifier, the grade represents the various physical and chemical properties of the glass, providing key information for manufacturers and R&D personnel.

[0081] When using the melting die designed in the present invention for melting and pressing, the die, containing the optical fiber bundle, needs to be placed in the hearth of a heating furnace for heating. While the heating furnace heats the optical fiber bundle, the auxiliary heater also provides auxiliary heating. The melting die described in the present invention is equipped with an auxiliary heater that can directly heat the interior of the optical fiber bundle, thereby significantly reducing the temperature difference between the interior and exterior of the optical fiber bundle during the melting and pressing process, thereby shortening the holding time to 0 to 30 minutes.

[0082] After the melt pressing is completed, the melt pressing mold is removed from the furnace and placed in an insulated box to cool to room temperature. Subsequently, the demolding operation is performed to remove the fiber optic panel blank, which is then processed to obtain the finished fiber optic panel. The subsequent processing includes: first, the blank is rounded into a cylinder with a diameter of 10 to 100 mm using a rounding machine, and then further cut into cylinders with a height of 3 to 100 mm using an internal circular cutting machine. Finally, it is polished using a polishing machine until there are no scratches when observed under an 8x magnifying glass, obtaining the final fiber optic panel product.

[0083] Preferably, in the aforementioned melt pressing method, the auxiliary heater is controlled to emit infrared light with a wavelength of 1 to 4 μm; and the power of the auxiliary heater is 1 kW to 15 kW.

[0084] Preferably, in the aforementioned melt pressing method, the optical fiber bundle is fire-polished until the outer surfaces of both ends of the optical fiber bundle are convex arc surfaces with a protruding length of 5 to 50 mm, and then placed into a melt pressing mold.

[0085] As shown in Figure 14, the present invention also uses a fire-polishing technique to perform surface treatment on both ends of the optical fiber bundle before melting and pressing. The two ends of the optical fiber panel are fire-polished using a hydrogen-oxygen flame. Under the action of surface tension, the two ends of the optical fiber panel multifilament present a convex structure, and the protrusion length is controlled to be 5 to 50 mm. This design helps to increase the light collection (infrared) effect; at the same time, the arc-shaped design of the base, pressure cover, upper baffle and lower baffle of the melting and pressing mold can converge the infrared light emitted by the infrared light emitting material or infrared generator into a beam and inject it into the interior of the optical fiber bundle in a concentrated manner. This design can increase the energy density of the infrared light, thereby achieving faster and deeper heating of the optical fiber bundle. This design of the present invention can significantly reduce the temperature difference between the inside and outside of the optical fiber bundle, overcome the defect that the optical fiber bundle needs to be kept warm for a long time during the melting and pressing process due to the large temperature difference between the inside and outside, thereby improving process efficiency. At the same time, it also improves the light collection effect and heating efficiency of the optical fiber panel, bringing more convenience and benefits to the production process.

[0086] It needs to be further explained that the protruding length of the protruding arc surface is 5 to 50 mm as shown in FIG. 14 .

[0087] Preferably, in the aforementioned melt pressing method, the melt pressing mold containing the optical fiber bundle is heated at a heating temperature of 600-700°C.

[0088] Controlling the heating temperature between 600°C and 700°C allows the infrared light emitting material, with an emissivity greater than 0.9, to emit infrared light that can be absorbed by the optical fiber bundle. If the temperature is too low or too high, the infrared light emitting material will emit light with longer or shorter wavelengths, which cannot be absorbed by the optical fiber bundle, resulting in ineffective heating inside the optical fiber bundle.

[0089] During the melt-pressing process, the melt-pressing mold containing the optical fiber bundle is placed in a heating furnace for heating. Therefore, the heating temperature of 600 to 700°C mentioned here refers to the actual heating temperature within the furnace. This temperature range ensures that the infrared light energy emitted by the infrared light-emitting material is fully absorbed by the optical fiber bundle, achieving uniform and efficient heating.

[0090] The present invention also provides a fiber optic panel capable of absorbing light with a wavelength of 1 to 4 μm.

[0091] Preferably, the aforementioned optical fiber panel is manufactured by the above-mentioned optical fiber panel fusion pressing method.

[0092] The present invention also provides a low-light-level image intensifier, which includes the above-mentioned optical fiber panel.

[0093] 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.

[0094] Unless otherwise specified, the materials and reagents mentioned below are commercially available products familiar to those skilled in the art. Unless otherwise specified, the methods described are all well-known methods in the art. Unless otherwise defined, technical or scientific terms used shall have the same meanings as those commonly understood by those skilled in the art.

[0095] Example 1

[0096] This embodiment is a method for preparing an optical fiber bundle, which includes:

[0097] (1) Melting a core glass rod (brand H-LaK3), wherein the outer diameter of the core glass rod is 30 mm and the length is 1000 mm; melting a sheath glass tube (brand H-K9), wherein the inner diameter of the sheath glass tube is 29 mm, the wall thickness is 2 mm, and the length is 1000 mm; inserting the core glass rod into the sheath glass tube to prepare an optical fiber preform;

[0098] (2) placing the optical fiber preform into a drawing furnace for drawing at 900°C into a single filament with a diameter of 2 mm and a length of 1000 mm;

[0099] (3) Arrange the monofilaments into a regular hexagon with 6 monofilaments on each side to form a multifilament rod with a length of 1000 mm;

[0100] (4) placing the primary multifilament rod into a wire drawing furnace for drawing to form a primary multifilament with a wire diameter of 1 mm and a length of 1000 mm;

[0101] (5) Arrange the primary multifilaments into a regular hexagon with 13 strands on each side to form a secondary multifilament rod with a length of 1000 mm;

[0102] (6) placing the secondary multifilament rod into a wire drawing furnace for drawing at 900°C to form secondary multifilament with a wire diameter of 1 mm and a length of 1000 mm;

[0103] (7) The secondary multifilament is cut into 300 mm pieces and arranged into a regular hexagonal prism with a side length of 50 mm to obtain an optical fiber bundle.

[0104] Example 2

[0105] An optical fiber panel melting and pressing die, used for melting and pressing an optical fiber bundle, as shown in FIG1 and FIG4 to FIG6, comprises:

[0106] Gland 1;

[0107] Die set 2;

[0108] Slider 3;

[0109] Pressing ring 4;

[0110] Base 5; and

[0111] An auxiliary heater 13 is provided on the surface of the base and the gland opposite to the end surface of the optical fiber bundle; the auxiliary heater is a graphite sheet with a thickness of 1 mm.

[0112] Example 3

[0113] The difference from Example 2 is that the auxiliary heater in this embodiment is a graphite sheet with a thickness of 5 mm.

[0114] Example 4

[0115] An optical fiber panel melting and pressing mold, used for melting and pressing optical fiber bundles, as shown in Figures 2 and 3, comprises:

[0116] Upper baffle 6;

[0117] Side baffle 7;

[0118] Lower baffle 8;

[0119] Upper slider 9;

[0120] Middle slider 10;

[0121] Lower slider 11;

[0122] side strips 12; and

[0123] The auxiliary heater 13 is provided on the surfaces of the upper baffle and the lower baffle opposite to the end surface of the optical fiber bundle; the auxiliary heater is a graphite coating with a thickness of 0.1 mm.

[0124] Example 5

[0125] The difference from Example 4 is that the auxiliary heater in this embodiment is a graphite sheet with a thickness of 5 mm.

[0126] Example 6

[0127] The difference from Example 2 is that the auxiliary heater in this embodiment is an infrared light emitter; the wavelength of the infrared light emitted by the infrared light emitter is 1 to 4 μm, and the power emitted by the infrared light emitter is 1 kW to 15 kW.

[0128] Example 7

[0129] The difference from Example 4 is that the auxiliary heater in this embodiment is a concrete coating with a thickness of 0.5 mm.

[0130] Example 8

[0131] The difference from Example 2 is that the auxiliary heater in this embodiment is a clay sheet with a thickness of 1 mm.

[0132] Example 9

[0133] A method for melting and pressing an optical fiber panel, as shown in FIG1 and FIG7 , comprises the following steps:

[0134] (1) The optical fiber bundle prepared in Example 1 was placed in the melting mold of Example 2, and the optical fiber bundle and the melting mold were placed in the hearth of a heating furnace. The hearth was evacuated to a vacuum degree of less than 10 Pa.

[0135] (2) Heat the furnace to 620°C and keep it warm for 15 minutes;

[0136] (3) Use the press 14 to press the melting die 17, and the downward stroke is 10 mm;

[0137] (4) taking the melt pressing mold out of the furnace, placing it in an insulation box to cool to room temperature, and demolding to obtain the optical fiber panel blank;

[0138] (5) The fiber optic panel blank is sent to a rolling machine to be rolled into a cylinder with a diameter of 45 mm, and then sent to an inner circle cutting machine to be cut into cylinders with a height of 15 mm. It is polished by a polishing machine until there are no scratches when observed under an 8x magnifying glass, and the final fiber optic panel product is obtained.

[0139] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0140] Example 10

[0141] A method for melting and pressing an optical fiber panel, as shown in FIG2 and FIG3, comprises the following steps:

[0142] (1) The optical fiber bundle prepared in Example 1 was placed in the melting mold of Example 4, and the optical fiber bundle and the melting mold were placed in the hearth of a heating furnace. The hearth was evacuated to a vacuum degree of less than 10 Pa.

[0143] (2) Heat the furnace to 620°C and keep it warm for 15 minutes;

[0144] (3) Use the press 14 to press the melting die 17, and the downward stroke is 10 mm;

[0145] (4) taking the melt pressing mold out of the furnace, placing it in an insulation box to cool to room temperature, and demolding to obtain the optical fiber panel blank;

[0146] (5) The fiber optic panel blank is sent to a rolling machine to be rolled into a cylinder with a diameter of 45 mm, and then sent to an inner circle cutting machine to be cut into cylinders with a height of 15 mm. It is polished by a polishing machine until there are no scratches when observed under an 8x magnifying glass, and the final fiber optic panel product is obtained.

[0147] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0148] Example 11

[0149] A method for melting and pressing an optical fiber panel, as shown in FIG1 and FIG7 , comprises the following steps:

[0150] (1) The optical fiber bundle prepared in Example 1 was placed in the melting mold of Example 3, and the optical fiber bundle and the melting mold were placed in the hearth of a heating furnace. The hearth was evacuated to a vacuum degree of less than 10 Pa.

[0151] (2) Heat the furnace to 620°C and keep it warm for 15 minutes;

[0152] (3) Use the press 14 to press the melting die 17, and the downward stroke is 10 mm;

[0153] (4) taking the melt pressing mold out of the furnace, placing it in an insulation box to cool to room temperature, and demolding to obtain the optical fiber panel blank;

[0154] (5) The fiber optic panel blank is sent to a rolling machine to be rolled into a cylinder with a diameter of 45 mm, and then sent to an inner circle cutting machine to be cut into cylinders with a height of 15 mm. It is polished by a polishing machine until there are no scratches when observed under an 8x magnifying glass, and the final fiber optic panel product is obtained.

[0155] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0156] Example 12

[0157] A method for melting and pressing an optical fiber panel, as shown in FIG2 and FIG3, comprises the following steps:

[0158] (1) The optical fiber bundle prepared in Example 1 was placed in the melting mold of Example 5, and the optical fiber bundle and the melting mold were placed in the hearth of a heating furnace. The hearth was evacuated to a vacuum degree of less than 10 Pa.

[0159] (2) Heat the furnace to 620°C and keep it warm for 15 minutes;

[0160] (3) Use the press 14 to press the melting die 17, and the downward stroke is 10 mm;

[0161] (4) taking the melt pressing mold out of the furnace, placing it in an insulation box to cool to room temperature, and demolding to obtain the optical fiber panel blank;

[0162] (5) The fiber optic panel blank is sent to a rolling machine to be rolled into a cylinder with a diameter of 45 mm, and then sent to an inner circle cutting machine to be cut into cylinders with a height of 15 mm. It is polished by a polishing machine until there are no scratches when observed under an 8x magnifying glass, and the final fiber optic panel product is obtained.

[0163] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0164] Example 13

[0165] Compared with Example 9, in this example, the optical fiber bundle prepared in Example 1 is placed in the melting mold described in Example 6, and the holding time is 0 min.

[0166] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0167] Example 14

[0168] Compared with Example 9, in this example, the optical fiber bundle prepared in Example 1 is placed in the melting mold described in Example 7, and the holding time is 30 minutes.

[0169] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0170] Example 15

[0171] Compared with Example 9, this example places the optical fiber bundle prepared in Example 1 into the melting mold described in Example 8.

[0172] The efficiency of the fusion pressing process of this embodiment is improved by 30%. The transmittance difference at different positions of the prepared optical fiber panel is less than 0.1%, and the resolution difference at different positions is less than 11p / mm.

[0173] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0174] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A fiber optic panel pressing mold for pressing a fiber optic bundle, characterized in that, it includes: a pressing plate; an auxiliary heater disposed on one side surface of the pressing plate; when the pressing mold presses the fiber optic bundle, the auxiliary heater faces the two end faces of the fiber optic bundle.

2. The pressing mold according to claim 1, characterized in that, the pressing mold is a horizontal pressing mold; the pressing plate includes an upper baffle and a lower baffle; the auxiliary heater is disposed on the opposite surface of the upper baffle and / or the lower baffle facing the end face of the fiber optic bundle; or, the pressing mold is a vertical pressing mold; the pressing plate includes a base and a pressing cover; the auxiliary heater is disposed on the opposite surface of the base and / or the pressing cover facing the end face of the fiber optic bundle.

3. The pressing mold according to claim 1, characterized in that, the auxiliary heater is an infrared light emitter and / or infrared light emitting material; the emissivity of the infrared light emitting material is greater than 0.9; the wavelength of the infrared light emitted by the infrared light emitter is 1 - 4 μm, and the power emitted by the infrared light emitter is 1 kw - 15 kw.

4. The pressing mold according to claim 3, characterized in that, the infrared light emitting material is selected from at least one of graphite, concrete, glass, asbestos board, and clay.

5. The pressing mold according to claim 2, characterized in that, the opposite surface of the upper baffle and the lower baffle facing the end face of the fiber optic bundle is a concave arc surface; the concave depth of the concave arc surface is 5 - 50 mm; or, the opposite surface of the base and the pressing cover facing the end face of the fiber optic bundle is a concave arc surface; the concave depth of the concave arc surface is 5 - 50 mm.

6. A method for pressing a fiber optic panel, characterized in that, it includes the following steps: Placing the fiber optic bundle after arranging the plates into the pressing mold; Heating the pressing mold containing the fiber optic bundle; the heating at least includes auxiliary heating of the two end faces of the fiber optic bundle through the auxiliary heater; Insulating for 0 - 30 min and applying pressure.

7. The pressing method according to claim 6, characterized in that, Controlling the auxiliary heater to emit infrared light with a wavelength of 1 - 4 μm; the power of the auxiliary heater is 1 kw - 15 kw; heating the pressing mold containing the fiber optic bundle, and the heating temperature is 600 - 700 °C.

8. The pressing method according to claim 6, characterized in that, Performing a fire polishing treatment on the fiber optic bundle until the outer surfaces at both ends of the fiber optic bundle are convex arc surfaces, the protruding length of the convex arc surface is 5 - 50 mm, and then putting it into the pressing mold.

9. A fiber optic panel, characterized in that, the fiber optic panel can absorb light with a wavelength of 1 - 4 μm; the fiber optic panel is prepared by the fiber optic panel pressing method according to any one of claims 6 to 7.

10. A low - light level image intensifier, characterized in that, it includes the fiber optic panel according to claim 9.

Images