High-definition optical fiber image transmitting array material and preparation method thereof

Abstract

The invention relates to a high-definition optical fiber image transmission array material and a preparation method thereof. The preparation method comprises the following steps: drawing monofilaments, sleeve absorption filaments and filling filaments; drawing a primary multifilament; drawing a secondary multifilament; arranging plates and carrying out hot melt pressing molding; the prepared high-definition optical fiber image transmitting array material blank plate section is processed into an optical fiber image transmitting array material blank plate blank through rounding, cutting and end face grinding and polishing operation, the optical fiber image transmitting array material blank plate blank is subjected to size finish machining to form an optical fiber panel, and the optical fiber panel is heated and twisted to form an optical fiber image inverter or heated and stretched to form a light cone; and the high-definition optical fiber image transmitting array material is processed. The high-definition optical fiber image transmission array material can effectively improve the resolution and the contrast ratio.

Description

Technical Field

[0001] The invention relates to the field of optical fiber image transmission element manufacturing, and in particular to a high-definition optical fiber image transmission array material and a preparation method thereof. Background Art

[0002] Fiber optic image array is a photoelectric imaging device with excellent performance. It is similar to fiber optic image transmission element. It adopts unique formula of leather, core and absorber, and is produced by vacuum control and rod-tube combined drawing process. The product has good air tightness, small distortion and few spots. It has simple structure, neat array, light weight, large numerical aperture, high light transmission efficiency, small inter-stage coupling loss, high coupling efficiency, high resolution, clear and real image transmission, zero thickness in optics, and can effectively improve edge image quality. Fiber optic image transmission array is also a hard fiber optic image transmission element formed by hot melting and pressing tens of millions of parallel optical fibers. Its biggest feature is that the light absorbing glass material presents a neat array arrangement in the internal structure. It is also a key material used in image intensifiers and high-definition displays. It is widely used in various cathode ray tubes, camera tubes, charge coupled devices CCD coupling, low-light night vision, medical device display screens, high-definition television imaging and other instruments and equipment that need to transmit images in the fields of national defense, military, public security, criminal investigation, aerospace, medical science, etc. It is a high-tech cutting-edge product in the optoelectronics industry of the current century.

[0003] The most typical application of fiber optic image array is as the optical output window of low-light image intensifier, which plays an important role in improving the quality of imaging devices. Usually, clarity is used to indicate the quality of image transmission, including resolution and contrast. Resolution generally refers to the minimum distance between two targets that can be distinguished. It is usually measured by the number of distances contained in a unit length, that is, the number of line distances that can be distinguished per millimeter. Contrast refers to the degree of contrast between light and dark in the image. The higher the resolution, the better the performance of image transmission. The higher the contrast, the more obvious the light and dark are, and the clearer the image transmitted is.

[0004] In the prior art, most optical fiber component products are mainly composed of 6-micron unit wire diameters, and a small number can reach 4-micron unit wire diameters. When the optical fibers are arranged regularly and the optical insulation is good, the resolution of the optical fiber imaging array mainly depends on the distance between the centers of adjacent optical fibers and the arrangement form. For optical fiber components with fixed unit wire diameters, the resolution performance of the regular hexagonal fiber arrangement is 1.15 times that of the square arrangement. Therefore, when preparing high-resolution optical fiber components, the regular hexagonal arrangement is conventionally used. Therefore, the size of the unit fiber wire diameter directly determines the resolution performance of the optical fiber imaging element. However, in the current preparation process and material system of optical fiber imaging materials, if high-definition optical fiber imaging materials need to be prepared, it is necessary to continue to reduce the unit fiber wire diameter, but the raw materials currently used for 4 or 6 microns are not suitable for preparing optical fiber imaging materials below 3 microns. And because optical fiber filaments are drawn by hot-melt traction, it is difficult to reduce the unit fiber diameter to below 3 microns due to the influence of many factors such as material properties, internal structure design of fiber filaments, and precision of drawing equipment. Even if the unit fiber diameter is reduced to below 3 microns, it will bring about problems such as transmittance and transmittance unevenness, resulting in serious light crosstalk or light leakage, which will seriously affect the image distortion performance and structural uniformity of the fiber optic imaging device, and ultimately affect the transmittance and transmittance uniformity of the fiber optic imaging material, making it impossible to achieve ultra-high-definition image transmission. The most important reason for this is that the light absorption performance of the light-absorbing glass material cannot meet the requirements. Summary of the invention

[0005] The main purpose of the present invention is to provide a method for preparing a high-definition optical fiber imaging array material which can effectively improve the resolution and contrast.

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

[0007] A method for preparing a high-definition optical fiber image transmission array material comprises the following steps:

[0008] (1) Drawing of single wires, sheathed absorption wires and filling wires: a core glass rod with a high refractive index is matched with a sheathed glass tube with a low refractive index to draw a single wire; a light absorbing glass rod and a sheathed glass tube are matched to draw a sheathed absorption wire, wherein the diameter of the sheathed absorption wire is the same as that of the single wire; a triangular high refractive index glass rod is drawn to make a triangular filling wire;

[0009] (2) Drawing of primary multifilaments: Arrange the drawn monofilaments into a primary composite rod with a regular hexagonal cross section with 7 monofilaments on each side, replace the central monofilament in the hexagon with a sleeve absorbing wire, and then evenly insert the filling wire into the primary composite rod, and then draw the primary composite rod into primary multifilaments;

[0010] (3) Drawing of secondary multifilaments: Arranging the drawn primary multifilaments into a secondary composite rod with a cross section of regular hexagonal shape with 10 to 20 strands on each side, and then drawing the secondary composite rod into secondary multifilaments;

[0011] (4) Arrangement and hot melt pressing: the secondary multifilaments are cut into secondary multifilament segments of a certain length, and then the secondary multifilament segments are arranged into a plate segment with a regular hexagonal cross section according to the requirement of 18 secondary multifilament segments on each side, and then the plate segment is placed in a hot melt pressing mold, and the plate is pressed according to the designed compression ratio before and after hot melt pressing of the plate segment, and after hot melt pressing, a high-definition optical fiber imaging array material blank plate segment with a unit wire diameter of ≤3μm is produced;

[0012] (5) Finishing: The prepared high-definition fiber optic image transmission array material blank plate segment is processed into a fiber optic image transmission array material blank plate blank through rounding, cutting, and end-face polishing operations. The fiber optic image transmission array material blank plate blank is finely processed in size to become a fiber optic panel, heated and twisted to form a fiber optic inverter, or heated and stretched to form a light cone, that is, processed into a high-definition fiber optic image transmission array material.

[0013] The core glass rod is finely ground and polished to a diameter of 29.5-30.5 mm; the thickness of the skin glass tube is 3.7-4.7 mm, and the inner diameter of the skin glass tube is 30.0-31.0 mm; the diameter of the monofilament is 2.98-3.02 mm; and the height of the triangular filling wire cross section is 0.64-0.68 mm.

[0014] The hexagonal opposite side size of the primary multifilament is 1.0 mm to 2.0 mm.

[0015] The hexagonal opposite side size of the secondary multifilament is 0.67mm-1.35mm.

[0016] The light absorbing material glass rod comprises the following components in molar percentage: SiO2 64-78%, B2O3 3-16%, Al2O3 0-5%, Li2O 0-1%, Na2O 0-6%, K2O 0-12%, MgO 0-1.5%, CaO 0-2.5%, BaO 0-1%, SrO 0-1%, ZnO 0-1%, TiO2 0-1%, ZrO2 0-1%, CeO2 0-1%, Fe2O3 0-6%, NiO 0.1-1%, V2O5 0-1%, Co2O3 0-2%, MoO3 0-0.2%, MnO2 0.1-2.5%, Cr2O3 0.1-2%, Nd2O3 0-1%, CuO0.1-2%, and F2 0-1%.

[0017] Preferably, the following components are included in molar percentage: SiO2 68-76%, B2O3 3-10%, Al2O3 3-5%, Li2O 0-1%, Na2O 2-6%, K2O 3-9%, MgO 0.2-1.0%, CaO 1-2.5%, BaO 0-0.1%, SrO 0-0.2%, ZnO 0-0.1%, TiO2 0-0.3%, ZrO2 0-0.3%, CeO20-0.1%, Fe2O3 0.1-6%, NiO 0.3-1%, V2O5 0-1%, Co2O3 0.1-1.5%, MoO30-0.2%, MnO2 0.1-2%, Cr2O3 0.1-1%, Nd2O3 0-0.5%, CuO 0.1-1%, F2 0.1-1%.

[0018] Preferably, the following components are included in molar percentage: SiO2 73%, B2O3 4%, Al2O3 4.8%, Na2O 5.2%, K2O 7%, MgO 0.5%, CaO 1.5%, SrO 0.1%, Fe2O3 0.4%, NiO 0.4%, Co2O3 1%, MnO2 0.3%, Cr2O3 0.5%, CuO 0.8%, and F2 0.5%.

[0019] Furthermore, it also includes a method for preparing a light absorbing material glass rod, comprising the following steps:

[0020] (1) Raw material preparation: weigh the raw materials according to the molar ratio and mix them evenly to obtain a raw material mixture;

[0021] (2) Glass melting: Add the raw material mixture into a crucible and melt it at 1420-1520° C. for 5-8 hours. After the raw material mixture is melted, stir it 2-3 times until a clear and homogenized glass liquid is formed. Discharge the glass liquid at 1360-1380° C. and cast it into the required glass in a mold. After the glass is cooled and solidified, anneal it at a temperature of 550-600° C. for 24-36 hours to obtain a light absorbing material glass. Process the light absorbing material glass into a light absorbing material glass rod.

[0022] The light absorbing glass has a spectral transmittance of ≤2.5% in the wavelength range of 380-760nm at a thickness of 0.30±0.01mm and a thermal expansion coefficient of (80±5)×10 －7 / ℃; no crystallization occurs when kept at 850℃ for 6 hours.

[0023] The present invention further provides a high-definition optical fiber image transmission array material, which is prepared according to the preparation method.

[0024] The present invention further provides an application of the high-definition optical fiber image transmission array material in a low-light-level image intensifier. The high-definition optical fiber image transmission array material of the present invention can be applied to a low-light-level night vision device.

[0025] Compared with the prior art, the high-definition optical fiber imaging array material of the present invention has the following advantages:

[0026] (1) The high-definition optical fiber imaging array material has a wire diameter of ≤3 μm and a resolution greater than 190 lp / mm;

[0027] (2) The crosstalk of the high-definition optical fiber imaging array material is less than 1.0% at a distance of 0.1 mm from the blade edge;

[0028] (3) The high-definition optical fiber imaging array material has excellent fixed pattern noise performance, and no obvious multifilament boundary is observed under a 10x microscope;

[0029] (4) The high-definition optical fiber imaging array material has a transmittance of >70% in the wavelength range of 380-760nm;

[0030] (5) The structural design and glass material of the present invention are applied to 3μm optical fiber imaging array materials, which can effectively improve the transmittance and contrast of the optical fiber imaging array materials and achieve high-definition imaging effects of the optical fiber imaging array materials.

[0031] The high-definition optical fiber image transmission array material of the present invention has the advantages of high resolution, high contrast, high transmittance and clear imaging. The high-definition optical fiber image transmission array material of the present invention is used in a low-light-level image intensifier, which can effectively improve the imaging clarity of the low-light-level image tube, meet the supporting needs of the low-light-level night vision industry, and can also replace traditional optical fiber image transmission component products, improve comprehensive use performance, and promote the development of optoelectronic devices in related fields such as space vision measurement and detection imaging towards high performance and wide field of view, and has a good application and promotion prospect.

[0032] 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

[0033] Figure 1 A schematic diagram of the internal structure of an optical fiber constituting an optical fiber image transmission array material provided by an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A magnified view of point I;

[0035] Figure 3The transmittance curve of the light absorbing material glass provided by the embodiment of the present invention;

[0036] Figure 4 This is the collimated light transmittance curve of the optical fiber imaging array material provided in Example 3 of the present invention at 380nm-760nm. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0038] See also Figure 1 and Figure 2 The skin glass tube and the core glass rod are matched and drawn into monofilaments, which include an outer skin glass 2 and an inner core glass 1. The drawn monofilaments are arranged into a primary composite rod with a regular hexagonal cross-section according to the requirement of 7 monofilaments on each side. The monofilament arranged in the center of the hexagon is replaced by a sleeve absorption wire 3, and a triangular glass filling wire 4 is provided between adjacent monofilaments.

[0039] See also Figure 3 , which is the transmittance curve of the light absorbing material glass provided by the present invention. It can be seen from the curve that it has strong light absorption ability and filtering effect in the wavelength range of 380-760nm, and the spectral transmittance is less than 2.5%. It can be seen that the light absorption effect on visible light is very obvious.

[0040] See also Figure 4 , is the collimated light transmittance curve of the optical fiber image transmission array material of Example 3 of the present invention at 380nm-760nm tested according to the collimated light transmittance test method in GB / T 26597-2011. It can be seen from the curve that the collimated light transmittance in the wavelength range of 380nm-760nm is 70.4%-80.2%, and its collimated light transmittance is greater than 70%, with excellent transmittance performance.

[0041] Table 1 Chemical composition (mol.%) and properties of light absorbing glass examples

[0042]

[0043] The glass sheets (thickness 0.30±0.01 mm) made of the raw materials of Examples 1 to 5 were tested. The spectral transmittance of the glass sheets of each Example in the wavelength range of 380-760 nm was <2.5%, and there was no phase separation or crystallization when kept at 850° C. for 6 hours.

[0044] Herein, all "mol. %" are based on the total molar amount of the final glass composition. The glass chemical compositions (mol. %) of the examples are listed in detail in Table 1.

[0045] The parameters, measuring methods and instruments for the light absorbing glass of the present invention are as follows:

[0046] (1) The transmittance of the light absorbing glass is measured using a transmittance tester;

[0047] (2) Average linear thermal expansion coefficient α at 30-300℃ 30 / 300 [×10 -7 / ℃] is measured using a horizontal dilatometer and the method specified in GB / T 16920-2015.

[0048] Example 1

[0049] A method for preparing a high-definition optical fiber image transmission array material comprises the following steps:

[0050] (1) Drawing of monofilament, sleeve absorption wire and filling wire:

[0051] a. Preparation of light absorbing glass rod:

[0052] Select raw materials according to the glass composition of Example 1 in Table 1, so that the ingredients meet the glass chemical composition of Table 1, and then prepare the contrast enhancement filter glass according to the following steps:

[0053] (1) Raw material preparation: weigh raw materials of quartz sand, boric acid, aluminum oxide, sodium carbonate, potassium carbonate, basic magnesium carbonate, calcium carbonate, barium nitrate, strontium carbonate, zinc oxide, titanium dioxide, zirconium oxide, cerium oxide, iron trioxide, nickel oxide, vanadium pentoxide, molybdenum trioxide, manganese dioxide, potassium chromate and copper oxide according to a molar ratio, mix them evenly, and obtain a raw material mixture;

[0054] (2) Glass melting: The raw material mixture is added into a crucible and melted at 1420°C for 8 hours. After the raw material mixture is melted, it is stirred twice, each stirring speed is 50 rpm, each stirring time is 1 hour, and the interval time between the two stirrings is 30 minutes, until a clear and homogenized glass liquid is formed. Then, the material is discharged at 1380°C and cast into a mold to form the required glass. After the glass is cooled and solidified, it is annealed at 600°C for 24 hours to obtain a light absorbing material glass, which is then drawn into a light absorbing material glass rod.

[0055] b. The high refractive index core glass rod is finely ground and polished to a diameter of 30.0 mm, and then matched with a low refractive index skin glass tube with a thickness of 4.2 mm and an inner diameter of 30.5 mm to draw a single wire with a single wire diameter of 3.0 mm;

[0056] c. The light absorbing glass rod and the leather glass tube prepared in step a are matched and drawn into a sleeve absorbing wire with a diameter of 3.0 mm;

[0057] d. The triangular high refractive index glass rod is drawn into a triangular filling wire, and the height of the cross section of the filling wire is 0.65 mm;

[0058] (2) Drawing of primary multifilaments: Arrange the drawn monofilaments into a primary composite rod with a regular hexagonal cross section with 7 monofilaments on each side, replace the monofilament arranged in the center of the hexagon with a sleeve absorption wire, and then evenly insert the filling wire into the primary composite rod, and then draw the primary composite rod into a primary multifilament, wherein the hexagonal opposite side size of the primary multifilament is 1.2 mm;

[0059] (3) secondary multifilament drawing: arranging the drawn primary multifilaments into a secondary composite rod with a cross section of a regular hexagonal square with 15 strands on each side, and then drawing the secondary composite rod into secondary multifilaments, wherein the hexagonal opposite side dimension of the secondary multifilaments is 1.0 mm;

[0060] (4) Arrangement and hot melt pressing: Cut the secondary multifilament into secondary multifilament segments with a length of 130 mm, and then arrange the secondary multifilament segments into a plate segment with a regular hexagonal cross section according to the requirement of 18 secondary multifilament segments on each side, and then put the plate segment into a hot melt pressing mold, and start pressing the plate according to the designed compression ratio before and after hot melt pressing of the plate segment, and after hot melt pressing, a high-definition optical fiber imaging array material blank plate segment with a unit wire diameter of 2.97 μm is produced;

[0061] (5) Finishing: The prepared high-definition fiber optic image transmission array material blank plate segment is processed into a fiber optic image transmission array material blank plate blank by rounding, cutting, and end surface grinding and polishing operations. The fiber optic image transmission array material blank plate blank is heated and twisted to form a high-definition fiber optic image inverter.

[0062] The prepared high-definition optical fiber image inverter has a crosstalk of 0.91% at a distance of 0.1mm from the blade, high contrast and imaging clarity; a resolution of 192lp / mm; excellent light transmission performance, with a transmittance of more than 70% in the wavelength range of 380-760nm; and excellent fixed pattern noise performance, with no obvious multifilament boundaries observed under a 10x microscope.

[0063] Example 2

[0064] A method for preparing a high-definition optical fiber image transmission array material comprises the following steps:

[0065] (1) Drawing of monofilament, sleeve absorption wire and filling wire:

[0066] a. Preparation of light absorbing glass rod:

[0067] Select raw materials according to the glass composition of Example 2 in Table 1, so that the ingredients meet the glass chemical composition of Table 1, and then prepare the contrast enhancement filter glass according to the following steps:

[0068] (1) Raw material preparation: weigh raw materials of quartz sand, boric acid, aluminum oxide, lithium carbonate, sodium carbonate, potassium carbonate, basic magnesium carbonate, calcium carbonate, zirconium oxide, nickel oxide, cobalt trioxide, molybdenum trioxide, manganese dioxide, potassium chromate, copper oxide and calcium fluoride in a molar ratio, mix them evenly, and obtain a raw material mixture;

[0069] (2) Glass melting: Add the raw material mixture into a crucible and melt it at 1520°C for 5 hours. After the raw material mixture is melted, stir it 3 times, each stirring speed is 80 rpm, each stirring time is 1 hour, and the interval time between each stirring is 1 hour, until a clear and homogenous glass liquid is formed. Then, discharge the material at 1360°C and cast it into the required glass in a mold. After the glass is cooled and solidified, annealing treatment is performed at 550°C for 36 hours to obtain light absorbing material glass, which is then drawn into a light absorbing material glass rod.

[0070] b. The high refractive index core glass rod is finely ground and polished to a diameter of 29.5 mm, and then matched with a low refractive index skin glass tube with a thickness of 3.7 mm and an inner diameter of 30.0 mm to draw a single wire, and the single wire diameter is 2.98 mm;

[0071] c. The light absorbing glass rod and the leather glass tube prepared in step a are matched and drawn into a sleeve absorbing wire with a diameter of 2.98 mm;

[0072] d. The triangular high refractive index glass rod is drawn into a triangular filling wire, and the height of the cross section of the filling wire is 0.64 mm;

[0073] (2) Drawing of primary multifilaments: Arrange the drawn monofilaments into a primary composite rod with a regular hexagonal cross section with 7 monofilaments on each side, replace the monofilament arranged in the center of the hexagon with a sleeve absorption wire, and then evenly insert the filling wire into the primary composite rod, and then draw the primary composite rod into a primary multifilament, wherein the hexagonal opposite side size of the primary multifilament is 2.0 mm;

[0074] (3) secondary multifilament drawing: arranging the drawn primary multifilaments into a secondary composite rod with a cross section of a regular hexagonal square with 10 strands on each side, and then drawing the secondary composite rod into secondary multifilaments, wherein the hexagonal opposite side dimension of the secondary multifilaments is 0.67 mm;

[0075] (4) Arrangement and hot melt pressing: Cut the secondary multifilament into secondary multifilament segments with a length of 127 mm, and then arrange the secondary multifilament segments into a plate segment with a regular hexagonal cross section according to the requirement of 18 secondary multifilament segments on each side, and then put the plate segment into a hot melt pressing mold, and start pressing the plate according to the designed compression ratio before and after hot melt pressing, and after hot melt pressing, a high-definition optical fiber imaging array material blank plate segment with a unit wire diameter of 2.99 μm is produced;

[0076] (5) Finishing: The prepared high-definition fiber optic imaging array material blank plate segment is processed into a fiber optic imaging array material blank plate blank by rounding, cutting, and end surface grinding and polishing. The fiber optic imaging array material blank plate blank is heated and stretched into a light cone.

[0077] The prepared light cone has a crosstalk of 0.92% at a distance of 0.1mm from the blade, high contrast and imaging clarity, a resolution of 192lp / mm, excellent light transmittance, with a transmittance of more than 70% in the wavelength range of 380-760nm, and excellent fixed pattern noise performance, with no obvious multifilament boundaries observed under a 10x microscope.

[0078] Example 3

[0079] A method for preparing a high-definition optical fiber image transmission array material comprises the following steps:

[0080] (1) Drawing of monofilament, sleeve absorption wire and filling wire:

[0081] a. Preparation of light absorbing glass rod:

[0082] Select raw materials according to the glass composition of Example 3 in Table 1, so that the ingredients meet the glass chemical composition of Table 1, and then prepare the contrast enhancement filter glass according to the following steps:

[0083] (1) Raw material preparation: weigh raw materials of quartz sand, boric acid, aluminum oxide, sodium carbonate, potassium carbonate, basic magnesium carbonate, calcium carbonate, strontium carbonate, ferric oxide, nickel oxide, cobalt oxide, manganese dioxide, potassium chromate, copper oxide and calcium fluoride according to a molar ratio, mix them evenly, and obtain a raw material mixture;

[0084] (2) Glass melting: The raw material mixture is added into a crucible and melted at 1470°C for 7 hours. After the raw material mixture is melted, it is stirred twice, each stirring speed is 70 rpm, each stirring time is 2 hours, and the interval time between each stirring is 30 minutes, until a clear and homogenous glass liquid is formed. Then, the material is discharged at 1370°C and cast into a mold to form the required glass. After the glass is cooled and solidified, it is annealed at 580°C for 30 hours to obtain a light absorbing material glass, which is then drawn into a light absorbing material glass rod.

[0085] b. The high refractive index core glass rod is finely ground and polished to a diameter of 30.5 mm, and then matched with a low refractive index skin glass tube with a thickness of 4.7 mm and an inner diameter of 31.0 mm to draw a single wire, and the single wire diameter is 3.02 mm;

[0086] c. The light absorbing glass rod and the leather glass tube prepared in step a are matched and drawn into a sleeve absorbing wire with a diameter of 3.02 mm;

[0087] d. The triangular high refractive index glass rod is drawn into a triangular filling wire, and the height of the cross section of the filling wire is 0.68 mm;

[0088] (2) Drawing of primary multifilaments: Arrange the drawn monofilaments into a primary composite rod with a regular hexagonal cross section with 7 monofilaments on each side, replace the monofilament arranged in the center of the hexagon with a sleeve absorption wire, and then evenly insert the filling wire into the primary composite rod, and then draw the primary composite rod into a primary multifilament, wherein the hexagonal opposite side size of the primary multifilament is 1.0 mm;

[0089] (3) secondary multifilament drawing: arranging the drawn primary multifilaments into a secondary composite rod with a cross section of a regular hexagonal shape according to the requirement of 20 strands on each side, and then drawing the secondary composite rod into secondary multifilaments, wherein the hexagonal opposite side dimension of the secondary multifilaments is 1.35 mm;

[0090] (4) Arrangement and hot melt pressing: Cut the secondary multifilament into secondary multifilament segments with a length of 133 mm, and then arrange the secondary multifilament segments into a plate segment with a regular hexagonal cross section according to the requirement of 18 secondary multifilament segments on each side, and then put the plate segment into a hot melt pressing mold, and start pressing the plate according to the designed compression ratio before and after hot melt pressing of the plate segment, and after hot melt pressing, a high-definition optical fiber imaging array material blank plate segment with a unit wire diameter of 2.99 μm is produced;

[0091] (5) Finishing: The prepared high-definition fiber optic image transmission array material blank plate segment is processed into a fiber optic image transmission array material blank plate blank through rounding, cutting, and end surface polishing operations. The fiber optic image transmission array material blank plate blank is subjected to size finishing to be prepared into a fiber optic panel.

[0092] The prepared optical fiber panel has a crosstalk of 0.89% at a distance of 0.1mm from the blade, high contrast and imaging clarity, a resolution of 192lp / mm, excellent light transmittance, with a transmittance of more than 70% in the wavelength range of 380-760nm, and excellent fixed pattern noise performance, with no obvious multifilament boundaries observed under a 10x microscope.

[0093] Example 4

[0094] A method for preparing a high-definition optical fiber image transmission array material is substantially the same as that in Example 1, except that:

[0095] a. Preparation of light absorbing glass rod:

[0096] Select raw materials according to the glass composition of Example 4 in Table 1, so that the ingredients meet the glass chemical composition of Table 1, and then prepare the contrast enhancement filter glass according to the following steps:

[0097] (1) Raw material preparation: weigh raw materials of quartz sand, boric acid, aluminum oxide, sodium carbonate, potassium carbonate, basic magnesium carbonate, calcium carbonate, barium nitrate, titanium dioxide, ferric oxide, nickel oxide, cobalt oxide, manganese dioxide, potassium chromate, neodymium oxide, copper oxide and calcium fluoride in a molar ratio, mix them evenly, and obtain a raw material mixture;

[0098] (2) Glass melting: Add the raw material mixture into a crucible and melt it at 1450°C for 7 hours. After the raw material mixture is melted, stir it for 3 times. The speed of each stirring is 60 rpm. The stirring time is 1.5 hours. The interval time between each stirring is 40 minutes, until a clear and homogenous glass liquid is formed. Then, discharge the material at 1365°C and cast it into the required glass in a mold. After the glass is cooled and solidified, annealing is performed at 570°C for 26 hours to obtain a light absorbing material glass. The light absorbing material glass is drawn into a light absorbing material glass rod.

[0099] The prepared high-definition optical fiber image inverter has a crosstalk of 0.92% at a distance of 0.1mm from the blade, high contrast and imaging clarity, a resolution of 192lp / mm, excellent light transmission performance, and a transmittance of more than 70% in the wavelength range of 380-760nm; it has excellent fixed pattern noise performance, and no obvious multifilament boundaries are observed under a 10x microscope.

[0100] Example 5

[0101] A method for preparing a high-definition optical fiber image transmission array material is substantially the same as that in Example 1, except that:

[0102] a. Preparation of light absorbing glass rod:

[0103] Select raw materials according to the glass composition of Example 5 in Table 1, so that the ingredients meet the glass chemical composition of Table 1, and then prepare the contrast enhancement filter glass according to the following steps:

[0104] (1) Raw material preparation: weigh raw materials of quartz sand, boric acid, lithium carbonate, barium nitrate, strontium carbonate, zinc oxide, titanium dioxide, zirconium oxide, cerium oxide, ferric oxide, nickel oxide, vanadium pentoxide, cobalt oxide, molybdenum trioxide, manganese dioxide, potassium chromate, neodymium oxide and copper oxide according to a molar ratio, mix them evenly, and obtain a raw material mixture;

[0105] (2) Glass melting: The raw material mixture is added into a crucible and melted at 1490°C for 8 hours. After the raw material mixture is melted, it is stirred for 3 times, each stirring speed is 70 rpm, each stirring time is 2 hours, and the interval time between each stirring is 30 minutes, until a clear and homogenous glass liquid is formed. The material is then discharged at 1370°C and cast into a desired glass in a mold. After the glass is cooled and solidified, it is annealed at 590°C for 28 hours to obtain a light absorbing material glass, which is then drawn into a light absorbing material glass rod.

[0106] The prepared high-definition optical fiber image inverter has a crosstalk of 0.94% at a distance of 0.1mm from the blade, high contrast and imaging clarity, a resolution of 192lp / mm, excellent light transmission performance, and a transmittance of more than 70% in the wavelength range of 380-760nm; it has excellent fixed pattern noise performance, and no obvious multifilament boundaries are observed under a 10x microscope.

[0107] 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 high-definition optical fiber imaging array material, characterized in that: The following steps are involved: (1) Drawing of single wires, sheathed absorption wires and filling wires: a core glass rod with a high refractive index is matched with a sheathed glass tube with a low refractive index to draw a single wire; a light absorbing glass rod and a sheathed glass tube are matched to draw a sheathed absorption wire, wherein the diameter of the sheathed absorption wire is the same as that of the single wire; a triangular high refractive index glass rod is drawn to make a triangular filling wire; (2) Drawing of primary multifilaments: Arrange the drawn monofilaments into a primary composite rod with a regular hexagonal cross section with 7 monofilaments on each side, replace the central monofilament in the hexagon with a sleeve absorbing wire, and then evenly insert the filling wire into the primary composite rod, and then draw the primary composite rod into primary multifilaments; (3) Drawing of secondary multifilaments: Arranging the drawn primary multifilaments into a secondary composite rod with a cross section of regular hexagonal shape with 10 to 20 strands on each side, and then drawing the secondary composite rod into secondary multifilaments; (4) Arrangement and hot melt pressing: the secondary multifilaments are cut into secondary multifilament segments of a certain length, and then the secondary multifilament segments are arranged into a plate segment with a regular hexagonal cross section according to the requirement of 18 secondary multifilament segments on each side, and then the plate segment is placed in a hot melt pressing mold, and the plate is pressed according to the designed compression ratio before and after hot melt pressing of the plate segment, and after hot melt pressing, a high-definition optical fiber imaging array material blank plate segment with a unit wire diameter of ≤3.0 μm is produced; (5) Finishing: The prepared high-definition fiber optic image transmission array material blank plate segment is processed into a fiber optic image transmission array material blank plate blank through rounding, cutting, and end-face polishing operations. The fiber optic image transmission array material blank plate blank is finely processed in size to become a fiber optic panel, heated and twisted to form a fiber optic inverter, or heated and stretched to form a light cone, that is, processed into a high-definition fiber optic image transmission array material.

2. The preparation method according to claim 1, characterized in that: The core glass rod is finely ground and polished to a diameter of 29.5-30.5 mm; the thickness of the skin glass tube is 3.7-4.7 mm, and the inner diameter of the skin glass tube is 30.0-31.0 mm; the diameter of the monofilament is 2.98-3.02 mm; and the height of the triangular filling wire cross section is 0.64-0.68 mm.

3. The preparation method according to claim 1, characterized in that: The hexagonal opposite side size of the primary multifilament is 1.0 mm to 2.0 mm.

4. The preparation method according to claim 1, characterized in that: The hexagonal opposite side size of the secondary multifilament is 0.67mm-1.35mm.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The light absorbing material glass rod comprises the following components in molar percentage: SiO2 64-78%, B2O3 3-16%, Al2O3 0-5%, Li2O 0-1%, Na2O 0-6%, K2O 0-12%, MgO 0-1.5%, CaO 0-2.5%, BaO 0-1%, SrO 0-1%, ZnO 0-1%, TiO2 0-1%, ZrO2 0-1%, CeO2 0-1%, Fe2O3 0-6%, NiO 0.1-1%, V2O5 0-1%, Co2O3 0-2%, MoO3 0-0.2%, MnO2 0.1-2.5%, Cr2O3 0.1-2%, Nd2O3 0-1%, CuO 0.1-2%, and F2 0-1%.

6. The preparation method according to claim 5, characterized in that: The invention comprises the following components in mole percentage: SiO2 68-76%, B2O3 3-10%, Al2O3 3-5%, Li2O 0-1%, Na2O 2-6%, K2O 3-9%, MgO 0.2-1.0%, CaO 1-2.5%, BaO 0-0.1%, SrO 0-0.2%, ZnO0-0.1%, TiO2 0-0.3%, ZrO2 0-0.3%, CeO20-0.1%, Fe2O3 0.1-6%, NiO 0.3-1%, V2O5 0-1%, Co2O3 0.1-1.5%, MoO3 0-0.2%, MnO2 0.1-2%, Cr2O3 0.1-1%, Nd2O3 0-0.5%, CuO 0.1-1%, and F2 0.1-1%.

7. The preparation method according to claim 6, characterized in that: It includes components in the following molar percentages: SiO2 73%, B2O3 4%, Al2O3 4.8%, Na2O 5.2%, K2O 7%, MgO 0.5%, CaO 1.5%, SrO 0.1%, Fe2O3 0.4%, NiO 0.4%, Co2O3 1%, MnO2 0.3%, Cr2O3 0.5%, CuO 0.8%, and F2 0.5%.

8. The preparation method according to claim 5, characterized in that: The invention also includes a method for preparing a light absorbing material glass rod, comprising the following steps: (1) Raw material preparation: weigh the raw materials according to the molar ratio and mix them evenly to obtain a raw material mixture; (2) Glass melting: adding the raw material mixture into a crucible, melting it at 1420-1520° C. for 5-8 hours, stirring it 2-3 times after the raw material mixture is melted until a clear and homogenized glass liquid is formed, discharging the glass liquid at 1360-1380° C., casting it into the required glass in a mold, and annealing it after the glass is cooled and solidified, at a temperature of 550-600° C. for 24-36 hours, to obtain a light absorbing material glass, and processing the light absorbing material glass into a light absorbing material glass rod; The light absorbing glass has a spectral transmittance of ≤2.5% in the wavelength range of 380-760nm at a thickness of 0.30±0.01mm and a thermal expansion coefficient of (80±5)×10 －7 / ℃; no crystallization occurs when kept at 850℃ for 6 hours.

9. A high-definition optical fiber imaging array material, characterized in that: It is prepared according to the preparation method according to any one of claims 1 to 8.

10. Use of the high-definition optical fiber image transmission array material according to claim 9 in a low-light level image intensifier.

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