Correction system and method for low image change of multilateral composite hard image-transmitting optical fiber

Abstract

The invention relates to a system and a method for correcting low image variation of a multilateral composite hard image-transmitting optical fiber. The correction system is characterized by comprising a wire drawing tower, a high-precision lead screw is fixed to the uppermost end of the wire drawing tower, an electric micro-rotation device is fixed to the high-precision lead screw, a fixing rod is arranged on one side of the wire drawing tower, and the fixing rod is fixed to the other side of the wire drawing tower. A base, a double-path laser diameter measuring instrument and a wire drawing wheel are sequentially fixed on the fixed rod from top to bottom, and a heating furnace is arranged on the base. Corresponding angle marking lines are carved on the binding clamp at the upper end of the mother rod, and then the angle of the mother rod is adjusted according to a rule diagram summarized by combining figures and figures, so that the purpose of quickly correcting the axial image change of the multifilament is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fibers, and particularly relates to a correction system and method for low image distortion of a multi-sided composite hard image transmission optical fiber. Background Art

[0002] When drawing hard optical fiber filaments, the fibers may undergo angular changes along the axial direction (hereinafter referred to as twisted filaments). In the prior art, operators rely on their operating experience to control the twisted filaments, and it is impossible to adjust the twisted filaments to the qualified range in a short time, which affects the quality and quantity of qualified optical fiber filaments. Moreover, the operating requirements for personnel are high, and the training period for taking up posts is long, which is not conducive to the stability of quality.

[0003] In practical applications, the twisted filaments will have a greater impact on the internal structure of the optical fiber panel, and thus affect the performance of the product such as shearing, dark spots, and distortion. Summary of the Invention

[0004] In view of this, the main purpose of the present invention is to provide a correction system and method for low image distortion of a multi-sided composite hard image transmission optical fiber. The problem to be solved is to mark corresponding angular markings on the bundling fixture at the upper end of the mother rod, and then adjust the angle of the mother rod with reference to the regular diagram summarized by the combination of numbers and shapes, so as to achieve the purpose of quickly correcting the axial image distortion of the multi-filament.

[0005] The purpose of the present invention and the solution to its technical problems are achieved by the following technical solutions. A correction system for low image distortion of a multi-sided composite hard image transmission optical fiber proposed by the present invention includes a wire drawing tower. A high-precision lead screw is fixed at the uppermost end of the wire drawing tower, and an electric micro-rotation device is fixed on the high-precision lead screw. A fixed rod is arranged on one side of the wire drawing tower, and a base, a dual-channel laser diameter gauge, and a wire drawing wheel are sequentially fixed on the fixed rod from top to bottom. A heating furnace is arranged on the base.

[0006] The purpose of the present invention and the solution to its technical problems can also be further realized by the following technical measures.

[0007] Preferably, in the aforementioned correction system for low image distortion of a multi-sided composite hard image transmission optical fiber, the vertical direction of the high-precision lead screw is perpendicular to the ground and parallel to the installation surface on one side of the wire drawing tower.

[0008] Preferably, in the aforementioned correction system for low image distortion of a multi-sided composite hard image transmission optical fiber, the optical fiber mother rod is connected to the electric micro-rotation device through a bundling fixture.

[0009] Preferably, in the aforementioned correction system for low image distortion of a multi-sided composite hard image transmission optical fiber, the outer diameter of the bundling fixture is 40 mm.

[0010] Preferably, in the foregoing correction system for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, angle marking lines are provided on the bundling fixture.

[0011] Preferably, in the foregoing correction system for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, the bundling fixture is a fixture marked with an interval of 0.35 mm, and the 0.35-mm interval is a 1° marking line.

[0012] Preferably, in the foregoing correction system for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, the centers of the electric micro-rotation device, the optical fiber master rod, the heating furnace, the base, the dual-channel laser diameter gauge, and the wire drawing wheel are on the same straight line.

[0013] The object of the present invention and the solution to its technical problems can also be achieved by the following technical solutions. A correction method for low image distortion of a multi-sided composite rigid image-transmitting optical fiber proposed by the present invention includes the following steps:

[0014] 1) Bundling the master rod with a bundling fixture;

[0015] 2) Connecting the master rod bundled in step 1) to an electric micro-rotation device and a high-precision lead screw;

[0016] 3) Opening the high-precision lead screw to feed the material downward at a constant speed, feeding the master rod into the heating furnace to heat and melt the material; after the material head falls vertically under the action of gravity, guiding the fiber into the wire drawing wheel, and then cooling down to adjust the drawing;

[0017] 4) By monitoring and reading the numerical change curve of the torsion wire, comparing the numerical values in the X and Y directions, and calculating |X - Y|, determining the adjustment direction and adjustment angle.

[0018] The object of the present invention and the solution to its technical problems can also be further achieved by the following technical measures.

[0019] Preferably, in the foregoing correction method for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, the temperature for heating and melting the material is 880°C - 900°C.

[0020] Preferably, in the foregoing correction method for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, the time for heating and melting the material is 10 - 15 min.

[0021] Preferably, in the foregoing correction method for low image distortion of a multi-sided composite rigid image-transmitting optical fiber, the value of |X - Y| < 0.012 (1°).

[0022] By means of the above technical solutions, the correction system and method for low image distortion of a multi-sided composite rigid image-transmitting optical fiber provided by the present invention have at least the following advantages:

[0023] The present invention achieves the purpose of quickly correcting the axial image distortion of multifilaments by engraving corresponding angle scale lines on the bundling fixture at the upper end of the mother rod, and then adjusting the angle of the mother rod with reference to the regular diagram summarized by the combination of numbers and shapes.

[0024] The present invention changes the existing method of adjusting image distortion relying on experience into a digital method that can be easily mastered by personnel. It can reduce the numerical value of the angular change of the fiber along the axis within the shortest time, thereby controlling the angular change within the qualified range before producing qualified fibers. The material yield rate is increased by 5%. At the same time, it reduces the employment requirements for high accumulation of personnel operation experience and long time, reduces the operation difficulty of personnel, shortens the time for training to take up posts, and the training time is shortened by 93.33%. It reduces the axial image distortion of the fiber, improves the fiber consistency, and the torsional angle of the axial image distortion is less than or equal to 1°. Finally, the shear of the final product is increased by 1%, the dark spots are increased by 1.5%, and the distortion is increased by 1%.

[0025] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following describes the preferred embodiments of the present invention in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a correction system for low image distortion of a multi-sided composite hard image transmission optical fiber according to an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of a bundling fixture according to an embodiment of the present invention;

[0028] Figure 3 It is a regular diagram summarized by the combination of numbers and shapes according to an embodiment of the present invention;

[0029] Among them, 1 - high-precision lead screw; 2 - heating furnace; 3 - base; 4 - electric micro-rotation device; 5 - bundling fixture; 6 - optical fiber mother rod; 7 - dual-channel laser diameter gauge; 8 - optical fiber; 9 - wire drawing wheel; 10 - fixing rod; 11 - wire drawing tower; 20 - angle scale line. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the preferred embodiments to describe in detail the specific implementation manners, structures, features, and effects of the correction system and method for low image distortion of a multi-sided composite hard image transmission optical fiber according to the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0031] The following materials or reagents are all commercially available unless otherwise specified.

[0032] As Figure 1 , Figure 2 shown, some embodiments of the present invention provide a correction system for low image distortion of a multi-sided composite hard image-transmitting optical fiber, which includes a wire drawing tower 11. At the uppermost end on one side of the wire drawing tower 11, a high-precision lead screw 1 is fixed. An electric micro-rotation device 4 is fixed on the high-precision lead screw 1. A fixed rod 10 is arranged on one side of the wire drawing tower 11. A base 3, a dual-channel laser diameter gauge 7 and a wire drawing wheel 9 are successively fixed on the fixed rod 10 from top to bottom. A heating furnace 2 is arranged on the base 3.

[0033] In some alternative embodiments, the vertical direction of the high-precision lead screw 1 is perpendicular to the ground and parallel to one side surface of the wire drawing tower 10 to ensure that the movement trajectory of the electric micro-rotation device 4 is a straight line in the vertical direction.

[0034] In some alternative embodiments, the electric micro-rotation device 4 is connected to an optical fiber master rod 6. The cross-section of the optical fiber master rod 6 is a regular hexagon, and the opposite side dimension is 20 - 39.5 mm. The mechanical adjustment by the electric micro-rotation device 4 has higher precision than manual adjustment; the specific adjustment method is to control the electric micro-rotation device 4 by clicking the controller, and it can rotate 0.1 degree with one click.

[0035] In some alternative embodiments, the optical fiber master rod 6 is quickly inserted and connected to the electric micro-rotation device 4 through a bundling fixture 5. A quick-insert male head is installed at the upper end of the bundling fixture 5, and a quick-insert female head is installed at the lower end of the electric micro-rotation device 4. When drawing the fiber, the master rod needs to move uniformly in the vertical direction. By combining with the bundling fixture, the electric micro-rotation device and the lead screw as a whole, which can be regarded as a motion module, can the uniform motion in the vertical direction be realized.

[0036] In some alternative embodiments, the outer diameter of the bundling fixture is 40 mm; the bundling fixture 5 has an angle scale line 20. Further, the bundling fixture 5 is a fixture marked with an interval of 0.35 mm, and the 0.35 mm interval is a 1° scale line. Such a setting is to know the value of the adjustment angle, retain the process record, and trace back the process details in reverse.

[0037] In some alternative embodiments, the centers of the electric micro-rotation device 4, the optical fiber master rod 6, the heating furnace 2, the base 3, the dual-channel laser diameter gauge 7, and the wire drawing wheel 9 are on the same vertical straight line; such a setting can maximize the quality of the drawn fiber, such as the wire diameter accuracy and the torsional wire value. If the centers are not on the same vertical straight line, it will cause control errors and inaccurate reading of values, affecting the comprehensive quality of the fiber.

[0038] In the above technical solution, according to the drawing logic and operation steps of drawing optical fibers, first, the optical fiber preform 6 and the bundling fixture 5 are connected and fixed, and then they are connected and fixed to the electric micro-rotating device 4 together. Control the lead screw to rotate downward, drive the electric micro-rotating device 4 and the optical fiber preform 6 to move downward until the lower end of the optical fiber preform 6 passes through the upper opening of the heating furnace 2. Part of it is in the heating furnace 2, and the material head is melted. The material head is heated and softened, and at the same time, under the action of gravity, it passes through the lower opening of the heating furnace 2 (the heating furnace has upper and lower openings), droops downward, passes through the dual-channel laser diameter gauge 7, and is manually pulled into the wire drawing wheel 9 to draw optical fibers.

[0039] Some embodiments of the present invention also provide a method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber, including the following steps:

[0040] 1) Use a bundling fixture to bundle a preform with an opposite side of 20 - 39.5 mm; if the size of the preform is less than 20 mm or greater than 39.5 mm, it will cause the preform to be insecurely bundled and result in safety accidents. The outer diameter of the bundling fixture is 40 mm, and it is specifically a fixture marked with an interval of 0.35 mm, where the 0.35 mm interval represents a 1° scale line;

[0041] 2) Connect the preform bundled in step 1) to the electric micro-rotating device and the high-precision lead screw;

[0042] 3) Open the high-precision lead screw to feed the material downward at a constant speed, and the feeding speed is between 0.5 - 12 mm / min. If it is higher than 12 mm / min, the preform will stay in the heating furnace for too short a time, resulting in the preform not being able to melt; if it is lower than 0.5 mm / min, the preform will stay in the heating furnace for too long a time, resulting in the preform crystallizing at high temperature and shortening the service life of the wire drawing furnace. Feed the preform into the heating furnace, set the temperature of the heating furnace to 880°C - 900°C for melting the material. If it is lower than 880°C, the preform cannot melt; if it is higher than 900°C, the preform will crystallize at high temperature and damage the service life of the wire drawing furnace. Wait for 10 - 15 min. If it is less than 10 min, the preform cannot melt; if it is more than 15 min, the preform will crystallize at high temperature and damage the service life of the wire drawing furnace. The material head droops downward under the action of gravity, and a fiber with an opposite side of 1.0 ± 0.1 mm is led to the wire drawing wheel. If the opposite side is less than 0.9 mm or greater than 1.1 mm, fibers with the required dimensional accuracy cannot be drawn. The diameter of the wire drawing wheel is 120 ± 0.5 mm, and then cool down to a wire drawing temperature of 800 ± 1°C for adjusted drawing. If it is lower than 799°C, the preform cannot melt; if it is higher than 801°C, the preform will crystallize at high temperature and shorten the service life of the wire drawing furnace. The drawing speed of the wire drawing wheel is between 197 - 18528 mm / min. If it is lower than 197 mm / min or higher than 18528 mm / min, fibers that meet the dimensional requirements cannot be drawn;

[0043] 4) Monitor and read the numerical change curve of the torsion wire and the numerical values in the X and Y directions through a dual-channel laser diameter gauge, compare the numerical values in the X and Y directions to determine the adjustment direction; calculate the numerical value of |X - Y| with the largest difference to determine the adjustment angle; adjust the numerical value of the torsion wire to the qualified range according to the law diagram summarized by the combination of numbers and shapes, that is, |X - Y| < 0.012(1°). Within this range, it indicates that the angular change of the fiber in the axial direction is less than 1°. If it is greater than or equal to 1°, fibers within the qualified size range cannot be drawn.

[0044] The specific implementation manners of the present invention will be further described in detail below in conjunction with embodiments, but it should not be understood as a limitation on the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art to the present invention based on the above content of the present invention still fall within the protection scope of the present invention.

[0045] 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 are all well-known methods in the art. Unless otherwise defined, the technical terms or scientific terms used should have the ordinary meaning understood by those of ordinary skill in the art to which the present invention belongs.

[0046] Comparative Example 1

[0047] This comparative example provides a method for correcting low image distortion of a multi-sided composite hard image-transmitting optical fiber, including the following steps:

[0048] 1) Use a bundling fixture with an outer diameter of 40 mm to bundle a master rod with an opposite side of 39.5 mm.

[0049] 2) Connect the bundled master rod to a high-precision lead screw.

[0050] 3) Open the high-precision lead screw to feed the material downward at a constant speed of 5 mm / min, feed the master rod into the heating furnace, set the temperature of the heating furnace to 900 °C for material melting, wait for 15 min, and let the material head fall vertically under the action of gravity. Lead the fiber with an opposite side of 1.0 ± 0.1 mm into the drawing wheel, and then cool down to the drawing temperature of 800 °C for adjustment drawing at a speed of 7720 mm / min.

[0051] 4) Monitor and read the numerical change curve of the optical fiber filament through a dual-channel laser diameter gauge. Starting from a feed rate reading of 45 mm, manually repeatably adjust the angle of the master rod multiple times. It takes 11 minutes. After detection, the torsional angles of the axially imaged optical fiber filaments are all between 1.5° and 2.5°. At this time, the feed rate reading is 100 mm, and 547 optical fiber filaments are obtained. Finally, 100 products are produced. Using a reticle and a projector to detect, the shear value is 16 - 17 microns, 96 are qualified, and the shear pass rate is 96%. Using a Lambert source and a 10x optical magnifying glass to detect, the dark spot value is 50 - 60 microns, 50 are qualified, and the dark spot pass rate is 50%. Using a test pattern composed of straight lines, irradiating vertically with diffused light and projecting onto the screen to detect, the distortion value is 80 - 90 microns, 96 are qualified, and the distortion pass rate is 96%.

[0052] Example 1

[0053] The difference between this example and Comparative Example 1 is that it is adjusted by combining the regular diagram summarized by referring to the combination of numbers and shapes with the use of a bundling fixture engraved with angle markings to bundle the master rod.

[0054] This example provides a method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber, including the following steps:

[0055] 1) Use a bundling fixture with an outer diameter of 40 mm and markings at intervals of 0.35 mm and 1° to bundle a master rod with an opposite side of 39.5 mm;

[0056] 2) Connect the bundled master rod to an electric micro-rotation device and a high-precision lead screw;

[0057] 3) Open the high-precision lead screw to feed downward at a constant speed of 5 mm / min, send the master rod into the heating furnace, set the temperature of the heating furnace to 900 °C for material melting, wait for 15 minutes, the material head falls vertically under the action of gravity, lead the fiber with an opposite side of 1.0 ± 0.1 mm into the drawing wheel, and then cool down to the drawing temperature of 800 °C for adjustment and drawing at a speed of 7720 mm / min;

[0058] 4) Monitor and read the numerical change curve of the optical fiber filament through a dual-channel laser diameter gauge. The maximum peak value in the X direction is 1.3, and the value in the Y direction is 1.24. Refer to Figure 3The law diagram summarized by the combination of numbers and shapes as shown is used to judge that X>Y is a clockwise adjustment; calculate |X - Y| = 0.06, and refer to the law diagram summarized by the combination of numbers and shapes to judge that the adjustment angle is 5°; starting from the feed rate reading of 45 mm, the adjustment is repeated multiple times and it takes 3 minutes to adjust to the qualified state, that is, |X - Y| < 0.012 (1°), the peak value of the curve is less than 0.012, and the torsional angles of the axially image-varied optical fiber filaments drawn are all between 0 and 0.5°. At this time, the feed rate reading is 60 mm, and 587 optical fiber filaments are obtained.

[0059] Compared with Comparative Example 1, the adjustment time of Example 1 is shortened from 11 minutes to 3 minutes, and the adjustment time is shortened by 72.72%. The number of optical fiber filaments increases from 547 to 587, and 40 more qualified filaments are collected, and the material yield rate is increased by 9%. Finally, 100 products are produced. Using a reticle and a projector to detect, it is known that the shear value is not greater than 14 microns, and 99 are qualified, and the shear pass rate is 99%; it is increased by 3%; using a Lambert source and a 10x optical magnifying glass to detect, it is known that the dark spot value is 35 - 45 microns, and 55 are qualified, and the dark spot pass rate is 55%, an increase of 5%; using a test chart composed of straight lines, irradiating vertically with diffused light and projecting onto the screen to detect, it is known that the distortion value is 40 - 50 microns, and 99 are qualified, and the distortion pass rate is 99%, an increase of 3%.

[0060] Example 2

[0061] The difference between this example and Comparative Example 1 is that it does not refer to the law diagram summarized by the combination of numbers and shapes, but uses a bundling fixture engraved with angle markings to bundle the master rod for adjustment.

[0062] 1) Use a bundling fixture with an outer diameter of 40 mm and markings at intervals of 0.35 mm for 1° to bundle the master rod with an opposite side of 39.5 mm;

[0063] 2) Connect the bundled master rod to an electric micro-rotation device and a high-precision lead screw;

[0064] 3) Open the high-precision lead screw to feed downward at a uniform speed of 5 mm / min, send the master rod into the heating furnace, set the temperature of the heating furnace to 900 °C for material melting, wait for 15 minutes, the material head falls vertically under the action of gravity, lead the fiber with an opposite side of 1.0 ± 0.1 mm to the drawing wheel, and then cool down to the drawing temperature of 800 °C for adjustment and drawing at a speed of 7720 mm / min to obtain about 500 optical fiber filaments;

[0065] 4) Monitor and read the numerical change curve of the optical fiber filament through a dual-channel laser diameter gauge. Similarly, starting from a feed rate reading of 45 mm, adjust the angle of the master rod. Since the adjustment direction and angle are unknown, randomly select the adjustment direction and angle, resulting in a higher curve peak and increased overall change fluctuations. Finally, it takes 7 minutes to adjust to the qualified state, that is, |X - Y| < 0.012 (1°), the curve peak is less than 0.012, and the torsional angles of the axially distorted optical fiber filaments drawn are all between 0.5 and 1°. At this time, the feed rate reading is 80 mm, and 575 optical fiber filaments are obtained.

[0066] Compared with Comparative Example 1, the adjustment time in Example 2 is shortened from 11 minutes to 7 minutes, a reduction of 36.36% in the adjustment time. The number of optical fiber filaments increases from 547 to 575, with 28 more qualified filaments collected, and the material yield rate increases by 5%. Finally, 100 products are produced. Using a reticle and a projector to detect, the shear value is 16 - 16.5 microns, and 97 are qualified, with a shear pass rate of 97%, an increase of 1%; using a Lambert source and a 10x optical magnifying glass to detect, the dark spot value is 50 - 55 microns, and 51 are qualified, with a dark spot pass rate of 51%, an increase of 1%; using a test pattern composed of straight lines, irradiating vertically with diffused light and projecting onto the screen to detect, the distortion value is 80 - 85 microns, and 97 are qualified, with a distortion pass rate of 97%, an increase of 1%.

[0067] Example 3

[0068] The difference between this example and Comparative Example 1 is that a bundling fixture without angle markings is used to bundle the master rod, but the adjustment is carried out using the regular diagram summarized by referring to the combination of numbers and shapes.

[0069] 1) Use a bundling fixture with an outer diameter of 40 mm to bundle a master rod with an opposite side of 39.5 mm;

[0070] 2) Connect the bundled master rod to an electric micro-rotation device and a high-precision lead screw;

[0071] 3) Open the high-precision lead screw to feed downward at a constant speed of 5 mm / min, feed the master rod into the heating furnace, set the temperature of the heating furnace to 900 °C for melting the material, wait for 15 minutes, and the material head falls vertically under the action of gravity. Lead the fiber with an opposite side of 1.0 ± 0.1 mm to the wire drawing wheel, and then cool down to the wire drawing temperature of 800 °C for adjustment and drawing at a speed of 7720 mm / min to obtain about 500 optical fiber filaments;

[0072] 4) Monitor and read the numerical change curve of the optical fiber filament through a dual-channel laser diameter gauge. The maximum peak value in the X direction is 1.3 and the value in the Y direction is 1.24. Referring to the regular diagram summarized by the combination of numbers and shapes, it is judged that X > Y is a clockwise adjustment; calculate |X - Y| = 0.06, referring toFigure 3 The law diagram summarized by the combination of number and shape as shown is used to judge that the adjustment angle is 5°. Starting from the feed rate reading of 45 mm, the adjustment is repeated multiple times. Finally, it takes 5 minutes to adjust to the qualified state, that is, |X - Y| < 0.012(1°), the peak value of the curve is less than 0.012, and the torsional angles of the drawn optical fiber filaments with axial image distortion are all between 0.4° and 0.8°. At this time, the feed rate reading is 70 mm, and 583 optical fiber filaments are obtained.

[0073] Compared with Comparative Example 1, the adjustment time of Example 3 is shortened from 11 minutes to 5 minutes, and the adjustment time is shortened by 54.54%. The number of optical fiber filaments increases from 547 to 583, and 36 more qualified filaments are obtained, and the material yield rate is increased by 7%. Finally, 100 products are produced. Using a reticle and a projector to detect, the shear value is 15 - 16 microns, 98 are qualified, and the shear pass rate is 98%, an increase of 2%; using a Lambert source and a 10x optical magnifying glass to detect, the dark spot value is 45 - 50 microns, 53 are qualified, and the dark spot pass rate is 53%, an increase of 3%; using a test pattern composed of straight lines, irradiating vertically with diffused light and projecting onto the screen to detect, the distortion value is 65 - 75 microns, 98 are qualified, and the distortion pass rate is 98%, an increase of 2%.

[0074] Example 4

[0075] The difference between this example and Comparative Example 1 is that it combines the law diagram summarized by the combination of number and shape with bundling the mother rod using a bundling fixture engraved with angle markings, but does not read the numerical change curve of the optical fiber filament, directly judges and reads the maximum value in the XY direction, and makes adjustments.

[0076] This example provides a method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber, including the following steps:

[0077] 1) Use a bundling fixture with an outer diameter of 40 mm and marked with 1° markings at intervals of 0.35 mm to bundle a mother rod with an opposite side of 39.5 mm;

[0078] 2) Connect the bundled mother rod to an electric micro-rotation device and a high-precision lead screw;

[0079] 3) Open the high-precision lead screw to feed downward at a uniform speed of 5 mm / min, send the mother rod into the heating furnace, set the temperature of the heating furnace to 900 °C for melting the material, wait for 15 minutes, and the material head falls vertically under the action of gravity. Lead the fiber with an opposite side of 1.0 ± 0.1 mm into the drawing wheel, and then cool down to the drawing temperature of 800 °C for adjustment and drawing at a speed of 7720 mm / min;

[0080] 4) Directly read the maximum value in the X direction as 1.3 and the maximum value in the Y direction as 1.24, referring toFigure 3 As shown in the law diagram summarized by the combination of number and shape, it is judged that X>Y is adjusted clockwise; calculate

[0081] |X - Y| = 0.06. Referring to the law diagram summarized by the combination of number and shape, it is judged that the adjustment angle is 5°. Starting from the feed rate reading of 45 mm, the adjustment is repeated multiple times. It takes 7 minutes to adjust to the qualified state, that is, |X - Y| < 0.012 (1°), the peak value of the curve is less than 0.012, and the torsional angles of the drawn optical fiber filaments with axial image distortion are all between 0.4° and 0.8°. At this time, the feed rate reading is 70 mm, and 575 optical fiber filaments are obtained.

[0082] Compared with Comparative Example 1, the adjustment time of Example 4 is shortened from 11 minutes to 7 minutes, the adjustment time is shortened by 36.36%, the number of optical fiber filaments increases from 547 to 575, 28 more qualified filaments are collected, and the material yield rate is increased by 5%. Finally, 100 products are produced. Using a reticle and a projector to detect, the shear value is 15 - 16 microns, 98 are qualified, and the shear pass rate is 98%, an increase of 2%; using a Lambert source and a 10x optical magnifying glass to detect, the dark spot value is 45 - 50 microns, 53 are qualified, and the dark spot pass rate is 53%, an increase of 3%; using a test chart composed of straight lines, irradiating vertically with diffused light and projecting onto the screen to detect, the distortion value is 65 - 75 microns, 98 are qualified, and the distortion pass rate is 98%, an increase of 2%.

[0083] Example 5

[0084] The difference between this example and Comparative Example 1 is that it combines referring to the law diagram summarized by the combination of number and shape with using a bundling fixture engraved with angle markings to bundle the mother rod, but does not calculate the result of |X - Y| for adjustment.

[0085] This example provides a method for correcting low image distortion of a multi-sided composite hard image-transmitting optical fiber, including the following steps:

[0086] 1) Use a bundling fixture with an outer diameter of 40 mm and markings at intervals of 0.35 mm for 1° to bundle a mother rod with an opposite side of 39.5 mm;

[0087] 2) Connect the bundled mother rod to an electric micro-rotation device and a high-precision lead screw;

[0088] 3) Open the high-precision lead screw to feed downward at a uniform speed of 5 mm / min, feed the mother rod into the heating furnace, set the temperature of the heating furnace to 900 °C for melting the material, wait for 15 minutes, the material head falls vertically under the action of gravity, lead the fiber with an opposite side of 1.0 ± 0.1 mm into the drawing wheel, and then cool down to the drawing temperature of 800 °C for adjustment and drawing at a speed of 7720 mm / min;

[0089] 4) Monitor and read the numerical change curve of the optical fiber filament through a dual-channel laser diameter gauge. The maximum peak value in the X direction is 1.3, and the value in the Y direction is 1.24. Refer to Figure 3 the law diagram summarized by the combination of numbers and shapes shown, and judge that X>Y is a clockwise adjustment; calculate |X - Y| = 0.06, refer to the law diagram summarized by the combination of numbers and shapes, and judge that the adjustment angle is 5°; starting from the feed rate reading of 45 mm, repeat the adjustment multiple times. It takes 7 minutes to adjust to the qualified state, that is, |X - Y| < 0.012 (1°), the curve peak value is less than 0.012, and the torsional angles of the axially imaged optical fiber filaments drawn are all between 0.4 and 0.8°. At this time, the feed rate reading is 80 mm, and 575 optical fiber filaments are obtained.

[0090] Compared with Comparative Example 1, the adjustment time of Example 5 is shortened from 11 minutes to 7 minutes, and the adjustment time is shortened by 36.36%. The number of optical fiber filaments increases from 547 to 575, and 28 more qualified filaments are collected, and the material yield rate is increased by 5%. Finally, 100 products are produced. Using a graticule and a projector to detect, it is known that the shear value is 15 - 16 microns, and 98 are qualified, and the shear pass rate is 98%, an increase of 2%; using a Lambert source and a 10x optical magnifying glass to detect, it is known that the dark spot value is 45 - 50 microns, and 53 are qualified, and the dark spot pass rate is 53%, an increase of 3%; using a test chart composed of straight lines, irradiating vertically with diffused light, and projecting onto the screen to detect, it is known that the distortion value is 65 - 75 microns, and 98 are qualified, and the distortion pass rate is 98%, an increase of 2%.

[0091] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0092] The numerical ranges described in the present invention include all numerical values within this range, and include the range values composed of any two numerical values within this range. Different numerical values of the same index appearing in all embodiments of the present invention can be arbitrarily combined to form range values.

[0093] The technical features in the claims and / or the description of the present invention can be combined, and the combination method is not limited to the combination obtained through the citation relationship in the claims. The technical solutions obtained by combining the technical features in the claims and / or the description are also within the protection scope of the present invention.

[0094] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

1. A correction system for low image distortion of a multi-sided composite hard image transmission optical fiber, characterized in that: It comprises a drawing tower, the top end of which is fixed with a high-precision lead screw, on which an electric micro-rotation device is fixed, one side of the drawing tower is provided with a fixing rod, on which a base, a dual-path laser diameter gauge and a drawing wheel are fixed in sequence from top to bottom, and a heating furnace is provided on the base.

2. The low image distortion correction system of the multi-sided composite hard image transmission optical fiber according to claim 1, characterized in that: The vertical direction of the high-precision lead screw is perpendicular to the ground and parallel to the mounting surface on one side of the drawing tower.

3. The low image distortion correction system of the multi-sided composite hard image transmission optical fiber according to claim 1, characterized in that: The optical fiber mother rod is connected with the electric micro-rotation device through a bundling fixture.

4. The low image distortion correction system of the multi-sided composite hard image transmission optical fiber according to claim 1, characterized in that: The outer diameter of the strapping fixture is 40 mm; and the strapping fixture is provided with angle markings.

5. The low image distortion correction system of the multi-sided composite hard image transmission optical fiber according to claim 4, characterized in that: The bundling fixture is a fixture marked with 0.35mm intervals, and the 0.35mm intervals are 1° markings.

6. The low image distortion correction system of the multi-sided composite hard image transmission optical fiber according to claim 1, characterized in that: The centers of the electric micro-rotation device, the optical fiber mother rod, the heating furnace, the base, the double-path laser diameter measuring instrument and the drawing wheel are on the same straight line.

7. A method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber, characterized in that: The following steps are involved: 1) Use the strapping fixture to strap the mother rod; 2) Connect the bundled mother rod in step 1) to the electric micro-rotation device and the high-precision lead screw; 3) Open the high-precision screw and feed the material downward at a uniform speed, and send the mother rod into the heating furnace to heat the material; wait for the material head to fall down by gravity, and then lead the fiber to the drawing wheel, and then cool it down to adjust the drawing; 4) By monitoring and reading the value change curve of the torsion wire, comparing the values ​​in the X and Y directions, and calculating |XY|, the adjustment direction and angle are determined.

8. The method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber as claimed in claim 7, characterized in that: The outer diameter of the strapping fixture is 40 mm.

9. The method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber as claimed in claim 7, characterized in that: The temperature of the heating material is 880°C-900°C; the time of the heating material is 10-15 minutes.

10. The method for correcting low image distortion of a multi-sided composite hard image transmission optical fiber according to claim 5, characterized in that: The value of |XY| is less than 0.012 (1°).

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