A novel low-distortion optical fiber panel and its preparation method and application

Abstract

The present invention relates to a novel low-distortion optical fiber panel and its preparation method and application, and belongs to the field of optical fiber components. The problem of optical fiber single-filament distortion caused by high-temperature melting and pressing is solved. The preparation method comprises the following steps: primary multifilament layout: the primary multifilament is arranged to form a regular hexagonal rod with tight stacking and arrangement, so as to obtain a primary multifilament rod; primary multifilament rod curing treatment: the gap in the primary multifilament rod is filled with ultraviolet curing glue by pouring and curing method, and then the ultraviolet curing glue is cured to obtain a preliminary blank rod; low-temperature melting and pressing: the blank rod is melted and pressed at a first preset temperature at a low temperature; and then the panel blank is obtained after cutting; polishing: the panel blank is optically polished to obtain a novel low-distortion optical fiber panel. The optical fiber panel is used for coupling with a charge coupled device or a complementary metal oxide semiconductor. The present invention utilizes the pouring and curing method of ultraviolet curing glue, and the optical fiber panel prepared has the advantages of low deformation and no grid noise.

Description

Technical Field

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

[0002] The fiber optic panel is an optical component made of tens of millions of micron-level optical fibers that are regularly arranged and fused. These optical fibers are composed of a high-refractive-index core and a low-refractive-index cladding. Light is transmitted in the optical fiber according to the principle of total reflection, thus achieving efficient transmission of optical signals and high-fidelity transmission of images. The working principle of the fiber optic panel mainly involves three key steps: input, distribution, and output of optical signals. Each optical fiber transmits optical information as an independent image transmission unit. It has the characteristics of high light transmission efficiency, small inter-stage coupling loss, clear and real image transmission, and zero optical thickness.

[0003] The process of preparing optical fiber panels is very complicated. At present, the rod-tube matching method and three-time wire drawing process are widely used at home and abroad. The whole process covers multiple key links such as glass rod tube preparation, single wire drawing, multi-wire arrangement, vacuum melting and pressing, high-temperature stretching and precision optical processing. Through the designed hexagonal close-packed arrangement, combined with the insertion of light-absorbing wires and interstitial wires, the transmittance and imaging quality of the array are effectively improved, and finally the finished optical fiber panel is made. Because the arrangement of single wires in the preparation of optical fiber panels usually follows the hexagonal close-packed structure, due to inevitable human errors and the limitations of the current technical level, the single wires sometimes face each other, that is, two or more single wires touch each other at the top when arranged. In the subsequent wire drawing and pressurization process, the top single wires are prone to local stress concentration due to the uneven tension, causing plastic deformation of the material in these areas. During the melting and pressing process, affected by the wire diameter deviation and mold accuracy, the top monofilaments and the monofilaments cannot shift each other due to mutual meshing. The monofilaments around the pores will deform due to displacement deformation to fill the pores, which will cause deformation due to uneven pressure distribution. This deformation is often irreversible and has a negative impact on the uniformity of the internal structure and optical properties of the rod. At the same time, during melting and pressing, the higher the platen temperature, the lower the viscosity of the glass, the smaller the tensile stress required for the center elongation and the stress required for the edge multifilaments to be compressed, resulting in a greater difference between the elongation of the multifilaments in the center area and the elongation of the multifilaments at the edge, and the greater the lateral displacement. Therefore, under the same pressing scale, the higher the platen temperature, the greater the center distortion. At the same time, since there is usually a temperature difference between the edge and the center of the plate segment, when the viscosity of the raw material changes greatly with the higher melting and pressing temperature, the difference in elongation performance caused by the temperature difference will further cause distortion. These distortions reduce the clarity and stability of image transmission, and seriously affect the structural integrity and final performance of the optical fiber monofilaments.

[0004] Observation of traditional optical fiber panels under a microscope revealed that both primary and secondary multifilaments have a certain degree of noise, especially the optical fiber monofilaments at the edges of some secondary multifilaments have been severely deformed, forming more obvious noise. Therefore, after the secondary multifilaments are melt-pressed, obvious grid noise will be generated. In contrast, the grid noise of the primary multifilaments is less obvious. Therefore, how to adjust the process flow to reduce the distortion and grid noise caused by unavoidable problems such as optical fiber misalignment and meshing, and reduce the distortion of optical fiber monofilaments caused by high-temperature melting and pressing, has become a technical challenge that needs to be urgently solved in the field of optical fiber manufacturing. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for preparing a low-deformation, grid-noise-free optical fiber panel.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a novel low-distortion optical fiber panel comprises the following steps:

[0008] Primary multifilament layout: The primary multifilament is arranged to form a regular hexagonal rod with close packing arrangement, thus obtaining a primary multifilament rod;

[0009] Curing treatment of the primary multifilament rod: using the pouring curing method, the gaps in the primary multifilament rod are filled with UV curing glue, and then the UV curing glue is cured to obtain a preliminary blank rod;

[0010] Low temperature melting and pressing: the blank rod is subjected to low temperature melting and pressing at a first preset temperature to obtain an optical fiber rod blank;

[0011] Cutting and polishing: cutting the optical fiber rod blank into panel blanks of a certain thickness, and performing optical polishing on the panel blanks to obtain a novel low-distortion optical fiber panel.

[0012] The first preset temperature is 150-230° C., and the refractive index of the UV curing adhesive is 1.46-1.51.

[0013] The primary multifilament rod solidification process comprises:

[0014] Place the primary multifilament rod on the pad in the glue injector, fill the UV curing glue in the glue injector after degassing, until the thickness of the UV curing glue layer exceeds the first preset height at the bottom of the primary multifilament rod, stop injecting the UV curing glue, let it stand for a certain period of time, the UV curing glue flows to the upper surface of the primary multifilament rod through capillary action, fully penetrates the gaps between the primary multifilaments, and irradiates the UV curing glue with a curing lamp. After the UV curing glue is cured, a preliminary blank rod is obtained.

[0015] The degassing process of the UV curing adhesive comprises:

[0016] Pour the UV curing glue into the degassing cylinder, and put the degassing cylinder into the degassing machine. The volume of the degassing cylinder is 5-20ml, the rotation speed of the degassing machine is 1000-2000rpm, the time of the degassing treatment is 5-10min, and the standing time is 20-40min. The UV curing glue is degassed.

[0017] The internal shape and size of the glue injector are consistent with the external size of the primary multifilament rod, and the hexagonal opposite side size of the primary multifilament rod is 10~100mm; the height of the pad is 0.5~2mm, the wall thickness of the glue injector is 2~5mm, and the height of the glue injector is 50-300mm; the first preset height is 3-20mm.

[0018] The preparation method of the primary multifilament comprises the following steps:

[0019] (1) Preparation of optical fiber rods:

[0020] The skin glass tube is sheathed on the core glass rod to make an optical fiber rod;

[0021] (2) Drawing the optical fiber rod into bare optical fiber:

[0022] The optical fiber rod is heated in a graphite furnace to a second preset temperature, and after the optical fiber rod in the graphite furnace reaches a molten state, it is drawn into an optical fiber single filament;

[0023] (3) Drawing a multifilament:

[0024] The optical fiber filaments are arranged in a hexagonal close stacking manner, and the light absorbing filaments and the filling filaments are uniformly filled in the gaps between the hexagonally stacked optical fiber filaments to obtain a primary composite rod, which is then drawn into a primary multifilament at a certain drawing speed at a third preset temperature.

[0025] The second preset temperature is 700-820°C, the diameter of the optical fiber monofilament is 2.00-2.05 mm, the drawing speed is 10-14 m / min, and the third preset temperature is 750-850°C.

[0026] The refractive index of the skin glass tube is 1.45-1.51, and the skin glass tube comprises the following components in percentage by mass:

[0027] Silicon dioxide (SiO2) 63.0%~78.0%, aluminum oxide (Al2O3) 3.0%~5.0%, boron oxide (B2O3) 2.0%~5.0%, sodium oxide (Na2O) 1.1%~2.9%, potassium oxide (K2O) 5.1%~12.0%, magnesium oxide (MgO) 2.1%~10.0%, strontium oxide (SrO) 0.1%~7.0%, zinc oxide (ZnO) 0.1%~2.0%, fluorine (F2) 0.1%~4.5%;

[0028] The refractive index of the core glass rod is 1.79-1.81; the core glass rod comprises the following components in percentage by mass:

[0029] Silicon dioxide (SiO2) 10%~45%, boron oxide (B2O3) 1%~15%, aluminum oxide (Al2O3) 2%~13%, zinc oxide (ZnO) 4%~11%, calcium oxide (CaO) 3%~17%, lead oxide (PbO) 14%~40%, lithium oxide (Li2O) 0%~12%, titanium oxide (TiO2) 2%~12%, zirconium oxide (ZrO2) 3%~10%, bismuth oxide (Bi2O3) 1%~13%.

[0030] The present invention also provides a novel low-distortion optical fiber panel, which is prepared according to the preparation method.

[0031] The present invention further provides an application of the novel low-distortion optical fiber panel when coupled with a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), wherein the glue used for the coupling is of the same type as the UV curing glue.

[0032] By means of the above technical solution, the present invention has at least the following advantages:

[0033] The present invention found that during the melting and pressing process, the deformation formed by the secondary multifilament is larger, and the grid noise is more, while the deformation of the primary multifilament is relatively small, and the noise caused by the image transmission is relatively less. Therefore, the present invention arranges the primary multifilament to form a regular hexagonal rod that is tightly stacked and arranged; then, ultraviolet curing glue is poured to couple and reinforce the primary multifilaments to form a unified whole; because the melting point of the ultraviolet curing glue itself is relatively low, low-temperature melting and pressing is performed at a temperature of 150~230℃, and further molding is performed to make the blank structure more compact, taking into account the image transmission effect while effectively reducing the fiber deformation at the hexagonal multifilament interface caused by high-temperature melting and pressing of the secondary multifilament.

[0034] 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 in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a process flow chart of preparing a novel low-distortion optical fiber panel provided by an embodiment of the present invention;

[0036] Figure 2 is a cross-sectional schematic diagram of a primary multifilament provided by an embodiment of the present invention;

[0037] Figure 3 It is a cross-sectional schematic diagram of a novel low-distortion optical fiber panel provided by an embodiment of the present invention.

[0038] Among them, 1-core glass rod; 2-skin glass tube; 3-light absorbing single wire; 4-filling wire; 5-UV curing glue; 6-primary multifilament. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and 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.

[0040] like Figure 1 As shown, a novel method for preparing a low-distortion optical fiber panel comprises: designing raw materials, melting the materials, and preparing a core glass rod, a sheath glass tube, and a light absorbing rod respectively; sleeve the sheath glass tube on the core glass rod to make an optical fiber rod, and then melt the optical fiber rod and draw it into a single wire, draw the light absorbing rod into a light absorbing single wire, arrange the single wires into rods with a hexagonal cross section, and then insert the light absorbing single wire and the filling wire into the gaps between the single wires in the rod arrangement to form a primary composite rod, the primary composite rod is drawn into a primary multifilament, the primary multifilament is arranged into a primary multifilament rod with a hexagonal cross section, the primary multifilament rod is solidified by a casting method, and then melt-pressed at a low temperature, cut to obtain a panel blank, polished after the optical axis is determined, and a finished optical fiber panel for coupling is obtained, and the finished optical fiber panel is tested for performance.

[0041] The present invention uses primary multifilaments to make optical fiber panels, avoiding grid noise formed by secondary multifilament melting and pressing. Ultraviolet curing glue is used for coupling between primary multifilaments, and low-temperature melting and pressing is used to greatly reduce the deformation of the multifilament edges, effectively reduce grid noise, and improve imaging quality.

[0042] See also Figure 2 The glass tube 2 is mounted on the core glass rod 1 to form an optical fiber rod, and the optical fiber rod is drawn into optical fiber monofilaments. Multiple optical fiber monofilaments are closely arranged into a hexagonal body with a regular hexagonal cross section. Light absorbing monofilaments 3 and interstitial filaments 4 are inserted between adjacent optical fiber monofilaments. After the light absorbing monofilaments 3 and interstitial filaments 4 are inserted into the hexagonal body, a primary composite rod is formed. The primary composite rod is drawn into Figure 2 The primary multifilament shown.

[0043] The present invention finds that the monofilaments are relatively uniform in stress distribution due to their rod-like structure, interstitial filaments and light-absorbing monofilaments filling the structure, and the close stacking arrangement. Figure 2 As shown. Therefore, the uneven stress in the primary multifilament will be released in a relatively small amount during the melting and pressing process, so that the deformation of the wire material at the edge part is small, ensuring that the deformation of the primary multifilament during the formation process is minimized, thereby significantly reducing the grid noise during the image transmission process. The edge of the secondary multifilament will be deformed and form a relatively obvious grid noise. Since the tight stacking arrangement of the secondary multifilament during the plate arrangement will lead to uneven stress distribution, this uneven stress will be released during the melting and pressing process, causing the wire material at the edge part to deform, causing grid noise. At the same time, due to the structural characteristics of the regular hexagonal rod, the deformation of the edge is more likely to form an obvious grid pattern after pressing. This deformation and the unevenness of stress distribution directly affect the appearance quality of the rod, and have a negative impact on the uniformity and optical properties of the internal structure of the rod, reducing the clarity and stability of image transmission. After the primary multifilament is prepared, the secondary multifilament is not drawn, and the primary multifilament is directly used for plate arrangement, and coupled with ultraviolet curing glue to form an optical fiber panel, avoiding the stress release during the melting and pressing process of the secondary multifilament, causing grid noise, and improving the clarity and stability of image transmission.

[0044] See also Figure 3 A plurality of primary multifilaments are closely arranged into a hexagonal body with a regular hexagonal cross section, and ultraviolet curing glue 5 is filled between the primary multifilaments 6. After curing, low-temperature melting, cutting, and polishing, an optical fiber panel is formed.

[0045] The refractive index of the UV curing adhesive of the present invention is 1.46~1.51, and its refractive index performance is almost consistent with that of the glass tube, which effectively avoids the optical crosstalk problem caused by the refractive index deviation. The UV curing adhesive is a transparent colorless liquid with a high light transmittance, and will not interfere with the transmission of optical signals or introduce secondary noise, etc. The viscosity is moderate at room temperature, and it can be completely immersed in the gaps of the primary multifilaments, and has suitable bonding properties to achieve perfect coupling between the primary multifilaments, greatly improving the process while taking into account the performance of the optical fiber panel. The characteristic parameter table of the UV curing adhesive of the present invention and the characteristic parameter table of the adhesive after curing are shown in Table 1 and Table 2.

[0046] Table 1. UV curing adhesive characteristic parameters

[0047]

[0048] Table 2. Characteristic parameters of UV curing adhesive after curing

[0049]

[0050] Table 3 Chemical composition (%) and properties of the leather glass tube in the example

[0051]

[0052] Table 4 Chemical composition (%) and properties of the core glass rod in the embodiment

[0053]

[0054] The present invention will be further described below by means of specific embodiments:

[0055] Example 1

[0056] (1) Preparation of optical fiber panel:

[0057] The fiber optic panel is made of tens of millions or even hundreds of millions of micron-sized optical fibers through a specific process. The tapered optical fiber is composed of a core glass rod, a sheath glass tube, and UV-curing glue. Each fiber transmits the pixel independently from the input end to the output end.

[0058] The preparation of the optical fiber panel specifically includes the following steps:

[0059] S101. Preparation of optical fiber rod:

[0060] Select raw materials according to the glass composition of Example 1 in Table 3 and Table 4, and then put a skin glass tube made of skin glass on a core glass rod made of core glass to make an optical fiber rod;

[0061] S102. Drawing the optical fiber rod into optical fiber bare wire:

[0062] The optical fiber rod is heated to 760°C in a graphite furnace. After the optical fiber rod in the graphite furnace reaches a molten state, it is drawn into an optical fiber monofilament with a wire diameter of 2.03 mm. To ensure that the drawn optical fiber monofilament has high uniformity, the drawing speed is controlled at 12 m / min.

[0063] 103. Fiber optic monofilament is typed and drawn into multifilament:

[0064] The optical fiber monofilaments are arranged in a hexagonal close stacking manner, and the light absorbing monofilaments and the interstitial filaments are uniformly filled in the gaps between the hexagonally stacked optical fiber monofilaments to obtain a primary composite rod, which is then drawn into a primary multifilament at 800°C, and the drawing speed is still controlled at 12m / min;

[0065] 104. One-time multifilament layout:

[0066] The primary multifilaments are arranged to form tightly packed regular hexagons to obtain a primary multifilament rod; the cross-sectional area of ​​the primary multifilament rod is adjusted according to the required size of the optical fiber panel, and the opposite side size of the primary multifilament rod is 60 mm.

[0067] 105. Degassing treatment of UV curing adhesive:

[0068] After pouring the UV curing glue with a refractive index of 1.46 into a 10ml degassing cylinder, the degassing cylinder is placed in a degassing machine, and the parameters of the degassing machine are adjusted to 1500rpm and the time is 8min. The UV curing glue is debubbled to remove all the bubbles in the UV curing glue.

[0069] 106. Use the pouring curing method to cure the primary multifilament:

[0070] Place the primary multifilament rod on the support platform in the glue injector. The size of the glue injector is adjusted according to the required optical fiber panel. The range is consistent with the cross-section of the primary multifilament rod. The height of the support platform is 1mm, the wall thickness of the glue injector is 3mm, and the height of the glue injector is 200mm. Fill the degassed UV-curing glue in the glue injector until the thickness of the UV-curing glue layer exceeds 10mm at the bottom of the primary multifilament rod (adjustable according to the height of the hexagonal primary multifilament rod). Stop the glue injection and let it stand for 100 minutes. The UV-curing glue flows to the upper surface of the primary multifilament rod through capillary action and fully penetrates the gaps between the primary multifilaments. Use a curing lamp to irradiate the UV-curing glue for 30 minutes. After the UV-curing glue is fully cured, a preliminary blank rod is obtained.

[0071] 107. Low temperature melting and pressing:

[0072] The blank rod is subjected to low temperature melting and pressing at 200° C. to obtain an optical fiber rod blank;

[0073] 108. Cutting and polishing:

[0074] Cut the low-temperature melt-pressed fiber rod blank into a panel blank with a thickness of 3 mm. After determining the optical axis, use a precision engraving machine to process the input and output end faces of the cut panel blank. Then use a machining center to optically polish the input and output end faces to obtain a fiber optic panel.

[0075] 109. Detection:

[0076] The optical properties of the optical fiber panel, such as dark spots, distortion, and transmittance, were tested. The test results are shown in Table 5 corresponding to Example 1, and a new type of low-deformation, grid-noise-free coupling optical fiber panel was manufactured.

[0077] (2) Fiber optic panel and CCD / CMOS coupling

[0078] When coupling the fiber panel with the CCD / CMOS, the same type of UV curing glue is used. After turning on the CCD / CMOS power supply, the coupling process is monitored in real time on a high-precision displacement platform. The high-precision displacement platform has a moving accuracy and repeatability of 1 micron. Its high-definition camera is used to capture images, identify the center position, or couple to a specific position as needed. The fiber panel is perpendicular to the CCD / CMOS surface and fixed on the coupling bracket. 0.5 ml of UV curing glue is dripped in the center of the CCD / CMOS photosensitive surface. During the coupling process, the coupling effect is judged by observing the quality of the captured image. Once fully coupled, the curing light is started to irradiate evenly to achieve rapid curing of the UV curing glue and complete the coupling.

[0079] Example 2

[0080] (1) Preparation of optical fiber panel:

[0081] The fiber optic panel is made of tens of millions or even hundreds of millions of micron-sized optical fibers through a specific process. The tapered optical fiber is composed of a core glass rod, a sheath glass tube, and UV-curing glue. Each fiber transmits the pixel independently from the input end to the output end.

[0082] The preparation of the optical fiber panel specifically includes the following steps:

[0083] S101. Preparation of optical fiber rod:

[0084] Select raw materials according to the glass composition of Example 2 in Table 3 and Table 4, and then put a skin glass tube made of skin glass on a core glass rod made of core glass to make an optical fiber rod;

[0085] S102. Drawing the optical fiber rod into optical fiber bare wire:

[0086] The optical fiber rod is heated to 700℃ in a graphite furnace. After the optical fiber rod in the graphite furnace reaches a molten state, it is drawn into an optical fiber single wire with a wire diameter of 2 mm. In order to ensure that the drawn optical fiber single wire has high uniformity, the drawing speed is controlled at 10m / min.

[0087] 103. Fiber optic monofilament is typed and drawn into multifilament:

[0088] The optical fiber monofilaments are arranged in a hexagonal close stacking manner, and the light absorbing monofilaments and the interstitial filaments are uniformly filled in the gaps between the hexagonally stacked optical fiber monofilaments to obtain a primary composite rod, which is then drawn into a primary multifilament at 850°C, and the drawing speed is still controlled at 10m / min;

[0089] 104. One-time multifilament layout:

[0090] The primary multifilaments are arranged to form tightly packed regular hexagons to obtain a primary multifilament rod; the cross-sectional area of ​​the primary multifilament rod is adjusted according to the required size of the optical fiber panel, and the opposite side size of the primary multifilament rod is 100 mm.

[0091] 105. Degassing treatment of UV curing adhesive:

[0092] After pouring the UV curing glue with a refractive index of 1.49 into a 20ml degassing cylinder, the degassing cylinder is placed in a degassing machine, and the parameters of the degassing machine are adjusted to 1000rpm and the time is 10min. The UV curing glue is debubbled to remove all the bubbles in the UV curing glue.

[0093] 106. Use the pouring curing method to cure the primary multifilament:

[0094] Place the primary multifilament rod on the support platform in the glue injector. The size of the glue injector is adjusted according to the required optical fiber panel. The range is consistent with the cross-section of the primary multifilament rod. The height of the support platform is 0.5mm, the wall thickness of the glue injector is 5mm, and the height of the glue injector is 50mm. Fill the degassed UV-curing glue in the glue injector until the thickness of the UV-curing glue layer exceeds 5mm at the bottom of the primary multifilament rod (it can be adjusted according to the height of the hexagonal primary multifilament rod). Stop the glue injection and let it stand for 30 minutes. The UV-curing glue flows to the upper surface of the primary multifilament rod through capillary action and fully penetrates the gaps between the primary multifilaments. Use a curing lamp to irradiate the UV-curing glue for 40 minutes. After the UV-curing glue is fully cured, a preliminary blank rod is obtained.

[0095] 107. Low temperature melting and pressing:

[0096] The blank rod is melt-pressed at 230°C to obtain an optical fiber rod blank;

[0097] 108. Cutting and polishing:

[0098] Cut the low-temperature melt-pressed fiber rod blank into a panel blank with a thickness of 3 mm. After determining the optical axis, use a precision engraving machine to process the input and output end faces of the cut panel blank. Then use a machining center to optically polish the input and output end faces to obtain a fiber optic panel.

[0099] 109. Detection:

[0100] The optical properties of the optical fiber panel, such as dark spots, distortion, and transmittance, were tested. The test results are shown in Table 5 corresponding to Example 2, and a new type of low-deformation, grid-noise-free coupling optical fiber panel was manufactured.

[0101] (2) Fiber optic panel and CCD / CMOS coupling

[0102] When coupling the fiber panel with the CCD / CMOS, the same type of UV curing glue is used. After turning on the CCD / CMOS power supply, the coupling process is monitored in real time on a high-precision displacement platform. The high-precision displacement platform has a moving accuracy and repeatability of 1 micron. Its high-definition camera is used to capture images, identify the center position, or couple to a specific position as needed. The fiber panel is perpendicular to the CCD / CMOS surface and fixed on the coupling bracket. 0.1 ml of UV curing glue is dripped in the center of the CCD / CMOS photosensitive surface. During the coupling process, the coupling effect is judged by observing the quality of the captured image. Once fully coupled, the curing light is started to irradiate evenly to achieve rapid curing of the UV curing glue and complete the coupling.

[0103] Example 3

[0104] (1) Preparation of optical fiber panel:

[0105] S101. Preparation of optical fiber rod:

[0106] Select raw materials according to the glass composition of Example 3 in Table 3 and Table 4, and then put a skin glass tube made of skin glass on a core glass rod made of core glass to make an optical fiber rod;

[0107] S102. Drawing the optical fiber rod into optical fiber bare wire:

[0108] The optical fiber rod is heated to 820°C in a graphite furnace. After the optical fiber rod in the graphite furnace reaches a molten state, it is drawn into an optical fiber monofilament with a wire diameter of 2.05 mm. To ensure that the drawn optical fiber monofilament has high uniformity, the drawing speed is controlled at 14m / min.

[0109] 103. Fiber optic monofilament is typed and drawn into multifilament:

[0110] The optical fiber monofilaments are arranged in a hexagonal close stacking manner, and the light absorbing monofilaments and the interstitial filaments are uniformly filled in the gaps between the hexagonally stacked optical fiber monofilaments to obtain a primary composite rod, which is then drawn into a primary multifilament at 750°C, and the drawing speed is still controlled at 14m / min;

[0111] 104. One-time multifilament layout:

[0112] The primary multifilaments are arranged to form tightly packed regular hexagons to obtain a primary multifilament rod; the cross-sectional area of ​​the primary multifilament rod is adjusted according to the required size of the optical fiber panel, and the opposite side size of the primary multifilament rod is 10 mm.

[0113] 105. Degassing treatment of UV curing adhesive:

[0114] After pouring the UV curing glue with a refractive index of 1.51 into a 5ml degassing cylinder, put the degassing cylinder into a degassing machine, adjust the parameters of the degassing machine to 2000rpm, the time to 5min, and perform bubble removal treatment on the UV curing glue to remove all bubbles in the UV curing glue.

[0115] 106. Use the pouring curing method to cure the primary multifilament:

[0116] Place the primary multifilament rod on the support platform in the glue injector. The size of the glue injector is adjusted according to the required optical fiber panel. The range is consistent with the cross-section of the primary multifilament rod. The height of the support platform is 2mm, the wall thickness of the glue injector is 2mm, and the height of the glue injector is 300mm. Fill the degassed UV-curing glue in the glue injector until the thickness of the UV-curing glue layer exceeds 20mm at the bottom of the primary multifilament rod (it can be adjusted according to the height of the hexagonal primary multifilament rod). Stop the glue injection and let it stand for 200 minutes. The UV-curing glue flows to the upper surface of the primary multifilament rod through capillary action and fully penetrates the gaps between the primary multifilaments. The UV-curing glue is irradiated with a curing lamp for 20 minutes. After the UV-curing glue is fully cured, a preliminary blank rod is obtained.

[0117] 107. Low temperature melting and pressing:

[0118] The blank rod is melt-pressed at 150°C to obtain an optical fiber rod blank;

[0119] 108. Cutting and polishing:

[0120] Cut the low-temperature melt-pressed fiber rod blank into a panel blank with a thickness of 3 mm. After determining the optical axis, use a precision engraving machine to process the input and output end faces of the cut panel blank. Then use a machining center to optically polish the input and output end faces to obtain a fiber optic panel.

[0121] 109. Detection:

[0122] The optical properties of the optical fiber panel, such as dark spots, distortion, and transmittance, were tested. The test results are shown in Table 5 corresponding to Example 3, and a new type of low-deformation, grid-noise-free coupling optical fiber panel was manufactured.

[0123] (2) Fiber optic panel and CCD / CMOS coupling

[0124] When coupling the fiber panel with the CCD / CMOS, the same type of UV curing glue is used. After turning on the CCD / CMOS power supply, the coupling process is monitored in real time on a high-precision displacement platform. The high-precision displacement platform has a moving accuracy and repeatability of 1 micron. Its high-definition camera is used to capture images, identify the center position, or couple to a specific position as needed. The fiber panel is perpendicular to the CCD / CMOS surface and fixed on the coupling bracket. 0.8 ml of UV curing glue is dripped in the center of the CCD / CMOS photosensitive surface. During the coupling process, the coupling effect is judged by observing the quality of the captured image. Once fully coupled, the curing light is started to irradiate evenly to achieve rapid curing of the UV curing glue and complete the coupling.

[0125] Comparative Example 1:

[0126] According to the core and sheath glass component ratios in Example 1, a core glass rod and a sheath glass tube are prepared. The preparation method is the same as the traditional preparation method, and an optical fiber rod is prepared, and the optical fiber preform is drawn into an optical fiber bare wire, and the optical fiber single wire is drawn into a primary multifilament after layout, and the primary multifilament is laid out, drawn into a secondary multifilament, and the secondary multifilament is laid out, and then pressed at 660°C, cut, and polished to obtain an optical fiber panel. The optical properties of the optical fiber panel, such as dark spots, grids, and transmittance, are tested, and the test results are shown in Comparative Example 1 in Table 5. The coupling method of the optical fiber panel and CCD / CMOS is the same as that in Example 1.

[0127] Comparative Example 2:

[0128] According to the core and sheath glass component ratios in Example 1, a core glass rod and a sheath glass tube are prepared. The preparation method is the same as the traditional preparation method, and an optical fiber rod is prepared, and the optical fiber preform is drawn into an optical fiber bare wire, and the optical fiber single wire is drawn into a primary multifilament after layout, and the primary multifilament is laid out, and then drawn into a secondary multifilament, and the secondary multifilament is laid out, and then melt-pressed at 500°C, cut, and polished to obtain an optical fiber panel. The difference from Comparative Example 1 is that this comparative example adopts a 500°C melt-pressed molding method to prepare an optical fiber panel. The optical properties of the optical fiber panel, such as dark spots, grids, and transmittance, are tested, and the test results are shown in Comparative Example 2 in Table 5. The coupling method of the optical fiber panel and CCD / CMOS is the same as that in Example 1.

[0129] Table 5. Performance test table of optical fiber panels of Examples 1-3 and Comparative Examples 1-2

[0130]

[0131] As can be seen from Table 5, Examples 1-3 of the present invention optimize the preparation process of the panel, use primary multifilaments to cast with ultraviolet curing glue, and press and form at low temperature. The number of dark spots with a diameter of 25~90μm is 0. Compared with Comparative Examples 1 and 2, the traditional optical fiber panel preparation process is used to prepare optical fiber panels using secondary multifilaments. The number of dark spots with a diameter of 25~90μm is 5 and 3, respectively, which is significantly increased. This is because after the secondary multifilaments are melt-pressed, the deformation at the boundary of the primary multifilament will be higher than the deformation at the boundary of the optical fiber monofilament. At the same time, Examples 1-3 of the present invention are cast and cured by ultraviolet curing glue, and are pressed and formed at low temperatures of 200℃, 230℃, and 150℃, respectively, which effectively reduces the grid and optical fiber distortion caused by high-temperature melting and pressing. The shear distortion is 0.7~1.3μm, and the serpentine distortion is 0.3~0.6μm. Compared with the traditional manufacturing high-temperature pressing of Comparative Examples 1 and 2, the distortion is significantly reduced. Compared with Example 1 and Example 2, in the conventional process, the dark spots and distortions are improved by appropriately lowering the melting and pressing temperature, which also indirectly proves that the low-temperature melting and pressing technology can effectively reduce deformation and mesh generation.

[0132] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification 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 still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a novel low-distortion optical fiber panel, characterized in that: The following steps are involved: Primary multifilament layout: The primary multifilament is arranged to form a regular hexagonal rod with close packing arrangement, thus obtaining a primary multifilament rod; Curing treatment of the primary multifilament rod: using the pouring curing method, the gaps in the primary multifilament rod are filled with UV curing glue, and then the UV curing glue is cured to obtain a preliminary blank rod; Low temperature melting and pressing: the blank is melted and pressed at a first preset temperature to obtain an optical fiber rod blank; Cutting and polishing: cutting the optical fiber rod blank into panel blanks of a certain thickness, and performing optical polishing on the panel blanks to obtain a new type of low-distortion optical fiber panel; The first preset temperature is 150-230°C; The preparation method of the primary multifilament comprises the following steps: (1) Preparation of optical fiber rods: The skin glass tube is sheathed on the core glass rod to make an optical fiber rod; (2) Drawing the optical fiber rod into bare optical fiber: The optical fiber rod is heated in a graphite furnace to a second preset temperature, and after the optical fiber rod in the graphite furnace reaches a molten state, it is drawn into an optical fiber single filament; (3) Drawing a multifilament: The optical fiber monofilaments are arranged in a hexagonal close stacking manner, and the light absorbing monofilaments and the interstitial filaments are uniformly filled in the gaps between the hexagonally stacked optical fiber monofilaments to obtain a primary composite rod, and the primary composite rod is drawn into a primary multifilament at a certain drawing speed at a third preset temperature; The second preset temperature is 700-820°C, the diameter of the optical fiber monofilament is 2.00-2.05 mm, the drawing speed is 10-14 m / min, and the third preset temperature is 750-850°C.

2. The preparation method according to claim 1, characterized in that: The refractive index of the UV curing adhesive is 1.46-1.

51.

3. The preparation method according to claim 2, characterized in that: The primary multifilament rod solidification process comprises: Place the primary multifilament rod on the pad in the glue injector, fill the UV curing glue in the glue injector after degassing, until the thickness of the UV curing glue layer exceeds the first preset height at the bottom of the primary multifilament rod, stop injecting the UV curing glue, let it stand for a certain period of time, the UV curing glue flows to the upper surface of the primary multifilament rod through capillary action, fully penetrates the gaps between the primary multifilaments, and irradiates the UV curing glue with a curing lamp. After the UV curing glue is cured, a preliminary blank rod is obtained.

4. The preparation method according to claim 3, characterized in that: The degassing process of the UV curing adhesive comprises: Pour the UV curing glue into the degassing cylinder, and put the degassing cylinder into the degassing machine. The volume of the degassing cylinder is 5-20ml, the rotation speed of the degassing machine is 1000-2000rpm, the degassing time is 5-10min, and the standing time is 20-40min to remove bubbles from the UV curing glue.

5. The preparation method according to claim 4, characterized in that: The internal shape and size of the glue injector are consistent with the external size of the primary multifilament rod, and the hexagonal opposite side size of the primary multifilament rod is 10~100mm; the height of the pad is 0.5~2mm, the wall thickness of the glue injector is 2~5mm, and the height of the glue injector is 50-300mm; the first preset height is 3-20mm.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The refractive index of the skin glass tube is 1.45-1.51, and the skin glass tube comprises the following components in percentage by mass: Silicon dioxide (SiO2) 63.0%~78.0%, aluminum oxide (Al2O3) 3.0%~5.0%, boron oxide (B2O3) 2.0%~5.0%, sodium oxide (Na2O) 1.1%~2.9%, potassium oxide (K2O) 5.1%~12.0%, magnesium oxide (MgO) 2.1%~10.0%, strontium oxide (SrO) 0.1%~7.0%, zinc oxide (ZnO) 0.1%~2.0%, fluorine (F2) 0.1%~4.5%; The refractive index of the core glass rod is 1.79-1.81; the core glass rod comprises the following components in percentage by mass: Silicon dioxide (SiO2) 10%~45%, boron oxide (B2O3) 1%~15%, aluminum oxide (Al2O3) 2%~13%, zinc oxide (ZnO) 4%~11%, calcium oxide (CaO) 3%~17%, lead oxide (PbO) 14%~40%, lithium oxide (Li2O) 0%~12%, titanium oxide (TiO2) 2%~12%, zirconium oxide (ZrO2) 3%~10%, bismuth oxide (Bi2O3) 1%~13%.

7. A new type of low-distortion optical fiber panel, characterized in that: It is prepared according to the preparation method according to any one of claims 1 to 6.

8. An application of the novel low-distortion optical fiber panel according to claim 7 when coupled with a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), characterized in that: The glue used for coupling and the UV curing glue are of the same type.

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