Melt pressure mold and method for large-section image-transmitting optical fiber bundle end and melt pressure system

Abstract

The invention relates to a melting and pressing mold and method for a large-section image-transmitting optical fiber bundle end and a melting and pressing system. The melting and pressing die comprises a die sleeve, a base is arranged on the die sleeve, a plurality of sliding blocks are arranged on the base, a pressing ring is arranged on the sliding blocks, a pressing cover is arranged on the pressing ring, and a melting and pressing space used for containing a large-section image transmitting optical fiber bundle is defined by the sliding blocks. The problem to be solved by the invention is to realize glue-free combination between optical fibers by adopting a melting and pressing mold, a melting and pressing method and a melting and pressing system.

Description

Technical Field

[0001] The invention relates to the field of optical fiber technology, and in particular to a melting and pressing mold and method, and a melting and pressing system for a large-section image transmission optical fiber bundle end. Background Art

[0002] In the prior art, large-section image-transmitting optical fiber bundles are made by stacking. First, continuous monofilaments of a certain diameter are drawn out. Then, the monofilaments are arranged into single sheets without gaps or overlaps. The single sheets are then glued to fix the monofilaments to each other. Finally, the single sheets are tightly arranged and stacked into bundles. The use of gluing in large-section image-transmitting optical fiber bundles will result in the optical fiber bundles not being able to withstand high temperatures, resulting in large capacity losses and low optical fiber coupling efficiency. In addition, there is also prior art that uses a melting mold to melt-press large-section image-transmitting optical fiber bundles. However, when the melting mold melts the ends of large-section image-transmitting optical fiber bundles, the heat cannot be quickly transferred to the inside of the optical fiber bundle during the melting process because the optical fiber bundle is too large. This creates a temperature difference between the inside and outside, which ultimately leads to a decrease in product quality. In addition, during the melting process, there is a stress concentration area between the soft bundle and the hard end, which is extremely fragile and easy to break. Summary of the invention

[0003] In view of this, the main purpose of the present invention is to provide a melting and pressing mold, method and melting and pressing system for the end of a large-section image-transmitting optical fiber bundle. The problem to be solved is to use the melting and pressing mold, method and melting and pressing system to achieve glue-free bonding between optical fibers.

[0004] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. The present invention proposes a melting and pressing mold for the end of a large-section image transmission optical fiber bundle, the melting and pressing mold comprises a mold sleeve, the mold sleeve is provided with a base, the base is provided with a plurality of sliders, a plurality of the sliders are provided with a pressure ring, a pressure cover is provided on the pressure ring, and a plurality of the sliders are arranged to form a melting and pressing space for placing a large-section image transmission optical fiber bundle.

[0005] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0006] Preferably, in the aforementioned melting and pressing mold for the end of the large-section image-transmitting optical fiber bundle, the mold sleeve is connected to the base as a whole.

[0007] Preferably, the aforementioned melting and pressing mold for the end of the large-section image-transmitting optical fiber bundle further includes an auxiliary heater, which is arranged on the opposite surfaces of the base, the pressure cover and the end surface of the optical fiber bundle.

[0008] Preferably, in the aforementioned melting and pressing mold for the end of the large-section image-transmitting optical fiber bundle, the auxiliary heater is an infrared light emitter or a graphite sheet.

[0009] Preferably, the aforementioned melt-pressing mold for the end of the large-cross-section image-transmitting optical fiber bundle, wherein the large-cross-section image-transmitting optical fiber bundle comprises a plurality of image-transmitting optical fiber filaments, and the two ends of the plurality of image-transmitting optical fiber filaments are arranged in a corresponding order to form an image-transmitting interface; the middle part of the image-transmitting optical fiber bundle comprises a flexible optical fiber segment, and the outer periphery of the flexible optical fiber segment is coated with a flexible sleeve.

[0010] Preferably, in the aforementioned melting and pressing mold for the end of the large-cross-section image-transmitting optical fiber bundle, the diameter of the end of the large-cross-section image-transmitting optical fiber bundle is greater than 1 mm.

[0011] The purpose of the present invention and the solution to its technical problems can also be achieved by adopting the following technical solutions. The present invention proposes a melting and pressing system for the end of a large-section image-transmitting optical fiber bundle, the melting and pressing system includes a melting and pressing mold, the melting and pressing mold is arranged in a heating furnace, and a press is arranged at the upper end of the melting and pressing mold; the melting and pressing mold includes a mold sleeve, the mold sleeve is provided with a base, the base is provided with a plurality of sliders, the plurality of sliders are provided with a pressure ring, the pressure ring is provided with a pressure cover, and the plurality of sliders are arranged to form a melting and pressing space for placing a large-section image-transmitting optical fiber bundle.

[0012] The purpose of the present invention and the technical problem solved by the present invention can also be achieved by adopting the following technical solutions. The present invention proposes a method for melting and pressing the end of a large-section image transmission optical fiber bundle, comprising the following steps:

[0013] The end of the large-section image-transmitting optical fiber bundle is placed in a melting and pressing space with a vacuum degree of less than 10Pa, and then the temperature is raised to 600-700°C within 1-2 hours and kept warm for 0-30 minutes; then pressure is applied to melt and press the end of the large-section image-transmitting optical fiber bundle after melting and pressing; finally, the end of the large-section image-transmitting optical fiber bundle is cooled from 600-700°C to room temperature within 2-3 hours to obtain a molten end of a large-size image-transmitting optical fiber bundle.

[0014] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0015] Preferably, the aforementioned method for melting and pressing the end of a large-section image-transmitting optical fiber bundle comprises the following steps:

[0016] S1: placing the end of the large-size image transmission optical fiber bundle in a melting and pressing mold, placing the optical fiber bundle end and the melting and pressing mold as a whole in the furnace of a heating furnace, and evacuating the furnace to a vacuum degree of less than 10Pa;

[0017] S2 raises the temperature of the furnace, and the auxiliary heater performs auxiliary heating on the optical fiber bundle, raising the temperature to 600-700°C within 1-2 hours, and keeping the temperature for 0-30 minutes;

[0018] S3 then uses a press to transfer pressure to the cap of the melt pressing die;

[0019] S4 takes the melting and pressing mold out of the furnace, puts it into a heat preservation box and cools it down from 600-700° C. to room temperature within 2-3 hours to obtain a large-size image transmission optical fiber bundle molten end.

[0020] Preferably, in the aforementioned method for melting and pressing the ends of large-section image-transmitting optical fiber bundles, in step S2, the heating rate is 5-6°C / min.

[0021] Preferably, in the aforementioned method for melting and pressing the ends of large-section image-transmitting optical fiber bundles, in step S3, the pressing stroke of the press is 5-15 mm.

[0022] Preferably, in the aforementioned method for melting and pressing the ends of large-section image-transmitting optical fiber bundles, in step S4, the cooling rate is 3-4°C / min.

[0023] By means of the above technical solution, the melting and pressing mold, method and melting and pressing system of the large-section image transmission optical fiber bundle end provided by the present invention have at least the following advantages:

[0024] The present invention realizes the glue-free bonding between optical fibers and optical fibers by adopting a melting and pressing mold, a method, and a melting and pressing system, and forms a light guide beam by fusing the optical fiber head end at high temperature. After hot melting, the cladding of each optical fiber is tightly bonded, the gap between the optical fibers completely disappears, the arrangement is tighter than the traditional process, and the filling coefficient is close to 1, which greatly improves the transmission efficiency of the optical fiber bundle. While keeping the NA (numerical aperture) unchanged, the amount of light passing is greatly improved, and the filling amount of the optical fiber filament is greatly increased under the same caliber, which is 12% higher than the traditional optical fiber light transmittance; while increasing the amount of light guiding, the heat resistance is also improved, the end face can be continuously heat-resistant, and no glue bonding is required, which greatly improves the tolerance limit of the optical fiber bundle for laser power. Compared with the glue process in special environments such as high temperature and high pressure, the advantages are more obvious, and the process flow is simplified, saving production time and maintenance costs. When melting and pressing the end of a large-section image transmission optical fiber bundle, the hot melting process is the key. The present invention sets an auxiliary heater, and the auxiliary heater can directly transmit infrared light to the inside of the optical fiber bundle to achieve auxiliary heating of the inside of the optical fiber bundle. Therefore, when using the melting and pressing mold described in the present invention to prepare a large-sized image transmission optical fiber bundle, the defect of requiring long-term heat preservation due to the large temperature difference between the inside and outside can be reduced, thereby improving the process efficiency.

[0025] The large-size image transmission optical fiber bundle prepared by the present invention has an average transmittance of 89%-92% at 400-1000nm; the resolution difference at different positions of its end face is less than 11p / mm; and the optical power value after passing through the large-size image transmission optical fiber bundle of the present invention is 8.9-9.2mW.

[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 preferred embodiments of the present invention are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the melting and pressing mold of the large-section image-transmitting optical fiber bundle end of the present invention;

[0028] Figure 2 It is a schematic diagram of the melting and pressing system for heating the end of a large-section image-transmitting optical fiber bundle according to the present invention. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation, structure, features and effects of the melting and pressing mold and method of the end of the large-section image transmission optical fiber bundle proposed by the present invention, as well as the melting and pressing system in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0030] The following materials or reagents, unless otherwise specified, were commercially available.

[0031] like Figure 1 As shown, some embodiments of the present invention provide a melting and pressing mold for the end of an image-transmitting optical fiber bundle with a large cross-section, the melting and pressing mold comprising a mold sleeve 2, a base 5 is arranged on the mold sleeve 2, the number of sliders can be selected according to the shape of the optical fiber bundle end to be melted and pressed, a plurality of sliders 3 can be arranged on the base 5, a plurality of sliders 3 are respectively provided with pressure rings 4, a pressure cover 1 is arranged on the pressure ring 4, and a plurality of sliders 3 are arranged to form a melting and pressing space 7 for placing the large cross-section image-transmitting optical fiber bundle, and the size of the melting and pressing space 7 must match the size of the optical fiber bundle end.

[0032] In some optional technical solutions, the mold sleeve 2 and the base 5 are connected as one body.

[0033] In some optional technical solutions, an auxiliary heater 6 is also included to heat the end of the optical fiber bundle, so that the glass of the optical fiber bundle flows, adheres to each other and fills the gap; it is arranged on the opposite surface of the base 5, the pressure cover 1 and the end face of the optical fiber bundle, and conducts heat through the base 5 to heat the end of the optical fiber bundle. The auxiliary heater 6 can be an infrared light emitter or a graphite sheet with a thickness of 1-5mm; the wavelength of the infrared light emitted by the infrared light emitter is 1-4μm, and the power emitted by the infrared light emitter is 1kw-15kw; the thickness of the graphite sheet is 1-5mm; the auxiliary heater 6 emits infrared rays into the interior of the optical fiber bundle on the basis of heating by the heating furnace, and the end of the large-section light-transmitting and image-transmitting optical fiber bundle absorbs the infrared rays to achieve heating, thereby reducing the temperature difference between the inside and outside of the end of the large-section light-transmitting and image-transmitting optical fiber bundle, thereby improving the uniformity of heating.

[0034] In some optional technical solutions, the large-section image transmission fiber bundle comprises a plurality of image transmission fiber filaments, and the filaments at both ends of the plurality of image transmission fiber bundles are tightly and regularly arranged without being arranged in sequence to form a light transmission interface. The two ends of the plurality of image transmission fiber filaments are arranged in a corresponding sequence to form an image transmission interface; the middle portion of the image transmission fiber bundle comprises a flexible fiber segment, and the outer periphery of the flexible fiber segment is coated with a flexible sleeve.

[0035] By adopting the above-mentioned fusion pressing technical solution, an image transmission interface is formed by utilizing multiple image transmission optical fiber monofilaments arranged in layers at both ends of the image transmission optical fiber, so that the light or image at the interface at one end of the image transmission optical fiber can be transmitted to the image transmission interface at the other end. The light transmission optical fiber bundle receives the light transmitted from the light transmission interface at the receiving end, and the image transmission optical fiber bundle forms a transmission image consistent with the original image at the receiving end, so that the other end can be observed and recorded at one end of the optical fiber bundle.

[0036] In some optional technical solutions, the diameter of the end of the large-cross-section image-transmitting optical fiber bundle is greater than 1 mm.

[0037] Some embodiments of the present invention also provide a method for melting and pressing a large-section image transmission optical fiber bundle end, comprising the following steps:

[0038] S1: placing the optical fiber bundle in the melting and pressing space of the melting and pressing mold, placing the optical fiber bundle end and the melting and pressing mold as a whole in the furnace of the heating furnace, and evacuating the furnace to a vacuum degree of less than 10Pa;

[0039] S2 heats up the furnace at a rate of 5 to 6°C / min. At the same time, the auxiliary heater 6 also performs auxiliary heating on the optical fiber bundle. The auxiliary heater 6 can directly transmit infrared light to the inside of the optical fiber bundle to achieve auxiliary heating of the inside of the optical fiber bundle. The heating temperature in the furnace is controlled at 600 to 700°C within 1 to 2 hours and kept warm for 0 to 30 minutes. If the temperature is lower than 600°C or higher than 700°C, the temperature is too low or too high, which will cause the infrared light emitting material to emit light with a longer or shorter wavelength. These lights cannot be absorbed by the optical fiber bundle, resulting in the inability to effectively heat the inside of the optical fiber bundle.

[0040] S3 then uses a press to transfer pressure to the gland. To control the compression size of the fiber bundle end, the press stroke is 5-15mm. If the press stroke is too large, it will cause deformation of the fiber filaments. If the press stroke is too small, the fiber bundle leather cannot be fully bonded and filled. The gland presses the ring downward, and the ring presses the slider. After the slider is pressed, it moves toward the center to squeeze the fiber bundle, thereby achieving melting and pressing;

[0041] S4 takes the melting and pressing mold out of the furnace, puts it into an insulated box and cools it at a rate of 3-4°C / min, and cools it from 600-700°C to room temperature within 2-3 hours to obtain a large-size image transmission optical fiber bundle molten end.

[0042] The fusion pressing mold and method have the characteristics of high temperature resistance, high optical fiber coupling efficiency, and low energy loss.

[0043] In the above technical solution, the present invention manufactures an image optical fiber with a polygonal cross-sectional shape at the end by heating and pressurizing the ends of a plurality of optical fiber bundles. The plurality of optical fiber bundles as pixels are arranged and bundled to form a pixel group, and the ends are heated and pressurized from the side using a mold or the like to fuse the optical fiber monofilaments at the ends together.

[0044] like Figure 2 As shown, some embodiments of the present invention also provide a melting and pressing system for the end of a large-section image-transmitting optical fiber bundle, the melting and pressing system comprising a melting and pressing mold 10, the melting and pressing mold 10 is arranged in a heating furnace 9, and a press 8 is arranged on the upper end of the melting and pressing mold 10; during use, the melting and pressing mold 10 needs to be sent into the heating furnace 9 for heating, and the melting and pressing requires the use of a press 8, a heating furnace 9 and a melting and pressing mold 10; the melting and pressing mold 10 is the melting and pressing mold for the end of the large-section image-transmitting optical fiber bundle mentioned above; during the preparation process, the optical fiber bundle end 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 for heating, and then the press is used to transfer the pressure to the pressure cover, the pressure cover presses the pressure ring downward, the pressure ring presses the slider, and the slider moves toward the center after being pressed to squeeze the optical fiber bundle, thereby realizing melting and pressing.

[0045] For large-section image-transmitting optical fiber bundles, the present invention can fuse the optical fiber head ends through high temperature. After hot melting, the cladding of each optical fiber is tightly combined, the gaps between the optical fibers completely disappear, the arrangement is tighter than the traditional process, and the filling coefficient is close to 1, which greatly improves the transmission efficiency of the optical fiber bundle. While keeping the numerical aperture unchanged, the amount of light passing is greatly improved, and the filling amount of optical fiber filaments is greatly increased under the same caliber. Compared with the traditional solution of optical fiber end glue pasting technology, the heat resistance is improved while the light guide amount is increased. The end face can withstand continuous heat without glue bonding, which greatly improves the optical power tolerance limit of the optical fiber bundle. Compared with the glue process in special environments such as high temperature and high pressure, the advantages are more obvious. At the same time, the process flow is simplified, saving production time and maintenance costs.

[0046] Whether the hot melt process parameters are reasonable has a great impact on the performance of large-section image transmission bundles. To determine the reasonable heating and cooling rates, it is also necessary to determine the reasonable matching relationship between the hot melt temperature and the hot melt time. After the hot melt process experiment, the optical fiber has been heated twice, which reduces the transmittance of the optical fiber to a certain extent, and it is inevitable that some dark filaments will appear in the optical fiber bundle. Therefore, it is very necessary to optimize the effect of the hot melt process on the performance of the image transmission bundle, which is conducive to improving the quality of large-section optical fiber image transmission bundles.

[0047] The specific implementation methods of the present invention are further described in detail below in conjunction with the embodiments, but it should not be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0048] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0049] Example 1

[0050] The present embodiment provides a melting and pressing mold for the end of a large-size image-transmitting optical fiber bundle, the melting and pressing mold comprising a mold sleeve 2, the mold sleeve 2 is provided with a base 5, the base 5 is provided with six sliders 3, the six sliders 3 are provided with pressure rings 4, the pressure rings 4 are provided with a pressure cover 1, and the six sliders 3 are arranged to form a melting and pressing space for placing a large-section image-transmitting optical fiber bundle; it also includes an auxiliary heater 6 which is arranged on the opposite surface of the base 5 and the pressure cover 1 and the end face of the optical fiber bundle; the auxiliary heater 6 is a graphite sheet with a thickness of 3 mm.

[0051] Example 2

[0052] This embodiment provides a method for melting and pressing a large-size image transmission optical fiber bundle end, which includes the following steps:

[0053] (1) placing the end of the large-size image-transmitting optical fiber bundle in the melting and pressing mold of Example 1, placing the optical fiber bundle end and the melting and pressing mold as a whole in the furnace of a heating furnace, and evacuating the furnace to a vacuum degree of 8 Pa;

[0054] (2) The furnace is heated at a rate of 5.17°C / min, and the auxiliary heater 6 is used to assist in heating the optical fiber bundle, and the temperature is raised to 620°C within 2 hours and kept at this temperature for 15 minutes; the auxiliary heater 6 is a graphite sheet with a thickness of 3 mm;

[0055] (3) Use a press to pressurize the melting and pressing mold, and the downward stroke is 10 mm;

[0056] (4) The melting mold is taken out from the furnace, placed in a 620°C heat preservation box and cooled at a rate of 3.44°C / min. It is cooled from 620°C to room temperature within 3 hours to obtain a large-sized image transmission optical fiber bundle molten end.

[0057] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 90%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 2 is that the insulation time in step (2) of this embodiment is 0 min, and the remaining steps and parameters are the same as those in embodiment 2.

[0060] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 8.9mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 89%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0061] Example 4

[0062] The difference between this embodiment and embodiment 2 is that the insulation time in step (2) of this embodiment is 30 minutes, and the remaining steps and parameters are the same as those in embodiment 2.

[0063] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9.1mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 91%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0064] Example 5

[0065] The difference between this embodiment and embodiment 2 is that in step (2) of this embodiment, the furnace is heated at a rate of 5.17°C / min, and the auxiliary heater 6 assists in heating the optical fiber bundle, raising the temperature to 700°C within 2 hours. The remaining steps and parameters are the same as those in embodiment 2.

[0066] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 90%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 9p / mm.

[0067] Example 6

[0068] The difference between this embodiment and embodiment 2 is that in step (2) of this embodiment, the furnace is heated at a rate of 5.17°C / min, and the auxiliary heater 6 assists in heating the optical fiber bundle, raising the temperature to 600°C within 2 hours. The remaining steps and parameters are the same as those in embodiment 2.

[0069] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 90%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 10p / mm.

[0070] Example 7

[0071] The difference between this embodiment and embodiment 2 is that in step (3) of this embodiment, a press is used to pressurize the melting and pressing mold described in embodiment 1, and the downward pressing stroke is 15 mm. The remaining steps and parameters are the same as those in embodiment 2.

[0072] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9.2mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 92%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0073] Example 8

[0074] The difference between this embodiment and embodiment 2 is that in step (3) of this embodiment, a press is used to pressurize the melting and pressing mold described in embodiment 1, and the downward pressing stroke is 5 mm. The remaining steps and parameters are the same as those in embodiment 2.

[0075] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 8.9mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 90%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0076] Example 9

[0077] The difference between this embodiment and embodiment 2 is that in step (4) of this embodiment, the melting and pressing mold is taken out from the furnace, placed in a 620°C insulation box and cooled at a rate of 3.44°C / min, and cooled from 620°C to room temperature within 2 hours. The remaining steps and parameters are the same as those in embodiment 2.

[0078] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9.1mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 91%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0079] Example 10

[0080] The difference between this embodiment and embodiment 2 is that in step (4) of this embodiment, the melting and pressing mold is taken out from the furnace, placed in a 620°C insulation box and cooled at a rate of 3°C / min, and cooled from 620°C to room temperature within 3 hours. The remaining steps and parameters are the same as those in embodiment 2.

[0081] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9.2mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 92%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0082] Embodiment 11

[0083] The difference between this embodiment and embodiment 2 is that in step (4) of this embodiment, the melting and pressing mold is taken out from the furnace, placed in a 620°C insulation box and cooled at a rate of 4°C / min, and cooled from 620°C to room temperature within 3 hours. The remaining steps and parameters are the same as those in embodiment 2.

[0084] The large-size image transmission fiber bundle prepared in this embodiment is tested by a power meter before and after passing through the large-size image transmission fiber bundle, and the optical power values ​​are 10mW and 9.1mW respectively. The transmittance of the large-size image transmission fiber bundle is tested, and its average transmittance in 400-1000nm is 91%. The resolution at different positions of the end face of the large-size image transmission fiber bundle is tested by an optical microscope, and the resolution difference is less than 11p / mm.

[0085] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0086] The numerical range described in the present invention includes all the numerical values ​​within the range, and includes the range value formed by any two numerical values ​​within the range. Different numerical values ​​of the same indicator appearing in all embodiments of the present invention can be arbitrarily combined to form a range value.

[0087] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0088] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A melting and pressing die for the end of a large-section image-transmitting optical fiber bundle, characterized in that: The melting and pressing mold includes a mold sleeve, a base is arranged on the mold sleeve, a plurality of sliders are arranged on the base, a plurality of sliders are arranged on the sliders, a pressure ring is arranged on the pressure ring, a pressure cover is arranged on the pressure ring, and a plurality of sliders are arranged to form a melting and pressing space for placing a large-section image-transmitting optical fiber bundle.

2. The melting and pressing die for the end of a large-section image-transmitting optical fiber bundle as claimed in claim 1, characterized in that: The mold sleeve is connected with the base as a whole.

3. The melting and pressing die for the end of a large-section image-transmitting optical fiber bundle as claimed in claim 1, characterized in that: It also includes an auxiliary heater, which is arranged on the opposite surfaces of the base, the pressure cover and the end surface of the optical fiber bundle; the auxiliary heater is an infrared light emitter or a graphite sheet.

4. The melting and pressing die for the end of a large-section image-transmitting optical fiber bundle as claimed in claim 1, characterized in that: The large-section image-transmitting optical fiber bundle comprises a plurality of image-transmitting optical fiber filaments, the two ends of which are arranged in a corresponding order to form an image-transmitting interface; the middle portion of the image-transmitting optical fiber bundle comprises a flexible optical fiber segment, the outer periphery of which is coated with a flexible sleeve.

5. The melting and pressing die for the end of a large-section image-transmitting optical fiber bundle as claimed in claim 1, characterized in that: The diameter of the end of the large-section image-transmitting optical fiber bundle is greater than 1 mm.

6. A melting and pressing system for the end of a large-section image-transmitting optical fiber bundle, characterized in that: The melting and pressing system includes a melting and pressing mold, which is arranged in a heating furnace, and a press is arranged on the upper end of the melting and pressing mold; the melting and pressing mold includes a mold sleeve, and a base is arranged on the mold sleeve, and a plurality of sliders are arranged on the base, and a plurality of the sliders are arranged on the pressure ring, and a pressure cover is arranged on the pressure ring, and a plurality of the sliders are arranged to form a melting and pressing space for placing a large-section image-transmitting optical fiber bundle.

7. A method for melting and pressing the end of a large-section image-transmitting optical fiber bundle, characterized in that: The following steps are involved: The end of the large-section image-transmitting optical fiber bundle is placed in a melting and pressing space with a vacuum degree of less than 10Pa, and then the temperature is raised to 600-700°C within 1-2 hours and kept warm for 0-30 minutes; then pressure is applied to melt and press the end of the large-section image-transmitting optical fiber bundle after melting and pressing; finally, the end of the large-section image-transmitting optical fiber bundle is cooled from 600-700°C to room temperature within 2-3 hours to obtain a molten end of a large-size image-transmitting optical fiber bundle.

8. The method for melting and pressing the end of a large-section image-transmitting optical fiber bundle as claimed in claim 7, characterized in that: The method comprises the following steps: S1: placing the end of the large-size image transmission optical fiber bundle in a melting and pressing mold, placing the optical fiber bundle end and the melting and pressing mold as a whole in the furnace of a heating furnace, and evacuating the furnace to a vacuum degree of less than 10Pa; S2 raises the temperature of the furnace, and the auxiliary heater performs auxiliary heating on the optical fiber bundle, raising the temperature to 600-700°C within 1-2 hours, and keeping the temperature for 0-30 minutes; S3 then uses a press to transfer pressure to the cap of the melt pressing die; S4 takes the melting and pressing mold out of the furnace, puts it into a heat preservation box and cools it down from 600-700° C. to room temperature within 2-3 hours to obtain a large-size image transmission optical fiber bundle molten end.

9. The method for melting and pressing the end of a large-section image-transmitting optical fiber bundle as claimed in claim 8, characterized in that: In step S2, the heating rate is 5-6°C / min; in step S3, the pressing stroke of the press is 5-15mm.

10. The method for melting and pressing the end of a large-section image-transmitting optical fiber bundle according to claim 9, characterized in that: In step S4, the cooling rate is 3-4°C / min.

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