CN110727045B - Optical fiber taper and method of processing the same - Google Patents
Optical fiber taper and method of processing the same Download PDFInfo
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- CN110727045B CN110727045B CN201810785314.5A CN201810785314A CN110727045B CN 110727045 B CN110727045 B CN 110727045B CN 201810785314 A CN201810785314 A CN 201810785314A CN 110727045 B CN110727045 B CN 110727045B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
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Abstract
The application provides a processing method of an optical fiber cone, wherein the optical fiber cone comprises a large end surface part, a small end surface part and a smooth transition part; the smooth transition portion is located between the large end face portion and the small end face portion; the plurality of optical fibers forming the optical fiber cone extend to the small end surface part from the large end surface part and the smooth transition part; at the large end face portion, the respective optical fibers are arranged in parallel; at the small end surface portion, the respective optical fibers are arranged in parallel. The application provides an optical fiber awl, in big terminal surface portion and little terminal surface portion, the equal parallel setting of each optic fibre compares in current single straight district light cone, and this optical fiber awl is installed in optical equipment, and has better coupling efficiency between other optical devices in the optical equipment.
Description
Technical Field
The application relates to the technical field of optical devices, in particular to a processing method of an optical fiber cone.
Background
An optical fiber taper (hereinafter referred to as a light taper) is an optical device made of a large number of optical fibers through processes of regular arrangement, heating, pressure fusion and stretching; since the light cone has an effect of enlarging and reducing an image by a certain factor and can obtain a small object distance, it becomes one of core elements of an image enhancement device and is widely used in a miniaturized image apparatus and an image digitizing apparatus.
Because of the limitation of the processing technology, the light cone formed by the blank after the stretching technology can only be a single straight area light cone; that is, the extending direction of the optical fiber in the large end face area of the light cone is parallel to the axial lead of the light cone, and the included angle between the extending direction of the optical fiber in the small end face area and the axial lead of the light cone is an acute angle (at present, the included angle between the small end face of the general light cone and the axial lead of the light cone is mostly 30-70 degrees); in practical application, it has been verified that the conventional single straight area light cone cannot meet the application requirements in terms of coupling efficiency, high-quality resolution and the like.
Disclosure of Invention
The application provides an optical fiber cone to solve the technical problems in the background art; in addition, the application also provides a method for processing the optical fiber cone.
The application provides an optical fiber taper, a large end face portion, a small end face portion and a smooth transition portion; the smooth transition is located between the large face portion and the small face portion;
a plurality of optical fibers constituting the optical fiber taper each extend from the large end face portion, the smooth transition portion to the small end face portion;
at the large end surface portion, the respective optical fibers are arranged in parallel;
the respective optical fibers are arranged in parallel at the small end surface portion.
Optionally, the end surface cross section of the large end surface part and/or the small end surface part is rectangular.
The application provides a processing method of an optical fiber cone, which is formed by drawing a light cone blank by a horizontal drawing furnace; the method comprises the following steps:
positioning a first end of the light cone blank, stretching the light cone blank at a second end at a first speed, and rotating the light cone blank alternately in forward and reverse directions; simultaneously, moving the stretching inner furnace at a first speed, and then moving the stretching inner furnace at a second speed;
wherein: the second speed is opposite to the first speed in direction, and the ratio of the second speed to the first speed is a/b; a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed; b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area a to obtain the optical fiber cone.
Optionally, after moving the stretching inner furnace at the second speed, the method further includes: moving the stretching inner furnace at a third speed until two areas with smooth transition cross-sectional areas in the light cone blank are symmetrically arranged;
wherein the third speed is opposite to the first speed in direction and has the same magnitude.
The application provides another processing method of an optical fiber cone, which is formed by drawing a light cone blank by a horizontal drawing furnace; the method comprises the following steps:
positioning a first end of the light cone blank, stretching the light cone blank at a second end at a first speed, and rotating the light cone blank alternately in forward and reverse directions; simultaneously, moving the stretching inner furnace at a first speed, and then moving the stretching inner furnace at a fourth speed;
wherein: the fourth speed and the first speed are in the same direction, the ratio of the fourth speed to the first speed is a/b +1, a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed, and b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area a to obtain the optical fiber cone.
Optionally, after moving the stretching inner furnace at the third speed, the method further includes: moving the stretching inner furnace at a fifth speed until two areas with smooth transition cross-sectional areas in the light cone blank are symmetrically arranged;
wherein the fifth speed and the first speed have the same direction and the same size.
The application provides another processing method of an optical fiber cone, which is formed by straightening a light cone blank by a horizontal stretching furnace; the method comprises the following steps:
simultaneously stretching the light cone blank from both ends, and elongating the light cone blank at a first speed;
meanwhile, when the stretching inner furnace is fixed to meet the preset condition, the light cone blank is moved at a sixth speed;
wherein: the ratio of the sixth speed to the first speed is 2a/b, wherein a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed; b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area of c to obtain the optical fiber cone.
Optionally, after moving the light cone blank at the sixth speed, the method further includes: and fixing the stretching inner furnace until two smooth transition areas with cross-sectional areas in the light cone blank are symmetrically arranged.
The application provides another processing method of an optical fiber cone, which is obtained by processing in a vertical stretching furnace, and is characterized in that the method comprises the following steps:
heating the part of the light cone blank in the stretching inner furnace by adopting a stretching inner furnace until the part of the light cone blank in the stretching inner furnace reaches a preset section size;
enabling the light cone blank to move in the vertical direction relative to the stretching inner furnace, and enabling the part of the light cone blank located in the stretching inner furnace to keep the preset section size;
and cutting the light cone blank in an area with a cross section of a preset cross section size to obtain the optical fiber cone.
Optionally, the method further comprises, during the heating of the light cone blank in the stretching inner furnace, rotating the light cone blank alternately in forward and reverse directions.
The application provides an optical fiber awl, in big terminal surface portion and little terminal surface portion, the equal parallel setting of each optic fibre compares in current single straight district light cone, and this optical fiber awl is installed in optical equipment, and has better coupling efficiency between other optical devices in the optical equipment.
Drawings
FIG. 1 is a schematic cross-sectional view of a fiber optic taper provided in accordance with one embodiment;
FIG. 2 is a schematic structural view of a horizontal drawing furnace used in the optical fiber taper processing method according to the second embodiment to the fourth embodiment;
FIG. 3 is a flow chart of a method for processing an optical fiber taper according to a second embodiment;
FIG. 4 is a schematic longitudinal cross-sectional view of a light cone blank formed after S101;
FIG. 5 is a schematic longitudinal cross-sectional view of a light cone blank formed after S102;
FIG. 6 is a flow chart of a method for processing an optical fiber taper provided in the third embodiment;
FIG. 7 is a flowchart of a method for manufacturing an optical fiber taper according to the fourth embodiment;
FIG. 8 is a schematic structural view of a vertical stretching furnace used in example five;
FIG. 9 is a flowchart of a method for manufacturing an optical fiber taper according to the fifth embodiment;
in fig. 1: 11-large end face portion, 12-small end face portion, 13-smooth transition portion; in fig. 2: 1-a servo motor, 2-a base, 3-a stretching rod, 4-a stretching outer furnace, 5-a stretching inner furnace, 6-a light cone blank, 7-a slide rail and 8-a base; in fig. 4 and 5: 11-light cone blank; in fig. 8: 1-base, 2-slide rail, 3-base, 4-stretching rod, 5-light cone blank, 6-stretching outer furnace, 7-stretching inner furnace and 8-infrared diameter measuring instrument.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
FIG. 1 is a schematic cross-sectional view of an optical fiber taper provided in the first embodiment. The optical fiber cone (hereinafter referred to as a light cone) provided by the embodiment of the application is composed of a stretched light cone blank, and the light cone blank is obtained by regularly arranging, heating and pressurizing and fusing a plurality of optical fibers.
Referring to fig. 1, the light cone includes a large end surface portion 11, a small end surface portion 12, and a smooth transition portion 13; wherein the smooth transition 13 is located between the large face portion 11 and the small face portion 12. The plurality of optical fibers constituting the aforementioned taper extend from the large end surface portion 11, the smooth transition portion 13 to the small end surface portion 12. In the large end surface portion 11, the respective optical fibers are arranged in parallel; the respective optical fibers are also arranged in parallel at the small end surface portion 12.
Since the respective optical fibers are arranged in parallel at the large end surface portion 11 and the small end surface portion 12, the light cone mentioned in the embodiment of the present application is referred to as a double straight region light cone. Compared with the existing single straight area light cone, the light cone provided by the embodiment of the application is installed in the optical equipment, and has better coupling efficiency with other optical devices in the optical equipment.
In the light cone in the embodiment of the present application, the cross sections of the large end surface portion 11 and the small end surface portion 12 are both circular. In other embodiments, the large end surface portion 11 and the small end surface portion 12 may be milled into a shape having a rectangular cross section according to the shape of the optical device to be coupled. In addition, the large end face and the small end face 12 of the light cone provided by the embodiment of the application can be bent to form a special-shaped light cone.
In addition to providing the aforementioned light cone, the embodiments of the present application also provide several methods for processing the aforementioned light cone. In the second embodiment, the light cone blank is stretched by a horizontal stretching furnace to form the light cone, and in the fifth embodiment, the light cone blank is stretched by a vertical stretching furnace to form the light cone.
In order to better describe the processing method of the light cone in the second embodiment to the fourth embodiment, the structure of the horizontal stretching furnace is briefly described below. FIG. 2 is a schematic structural view of a horizontal drawing furnace used in the optical fiber taper processing method according to the second embodiment to the fourth embodiment; as shown in fig. 2, the horizontal stretching furnace includes a base 8, a slide rail 7, a base 2, a stretching outer furnace 4, a stretching inner furnace 5, a servo motor 1, and a stretching rod 3. The sliding rail 7 is arranged on the base 8, and the base 2 is arranged on the sliding rail 7 and can move along with the sliding rail 7; the stretching rod 3 is horizontally arranged on the base 2 and can clamp a light cone blank 6; the servo motor 1 is mounted on the base 2 and can control the stretching rod 33 to rotate according to a driving program. The stretching outer furnace 4 is fixed on the base 8; the stretching inner furnace 5 is also mounted on the base 8, but is movable in the extending direction of the stretching rod 3. As shown in the figure, two bases 2 are arranged on the base 8; the two bases 2 are respectively mounted on a base 8 through different slide rails 7, and both can move relative to the base 8.
Example two
FIG. 3 is a flow chart of a method for processing an optical fiber taper according to a second embodiment. As shown in fig. 3, the method for processing an optical fiber taper provided by the embodiment of the present application includes steps S101 to S103.
S101: and positioning the first end of the light cone blank, stretching the light cone blank at the second end at a first speed, rotating the light cone blank in a positive and negative rotation mode alternately, moving the stretching inner furnace at the first speed, and then moving the stretching inner furnace at a second speed.
In the embodiment of the application, one end of the light cone blank 6 is fixed on the stretching rod 3 corresponding to the left base 2 of the horizontal stretching furnace, and the other end is fixed on the stretching rod 3 corresponding to the right base 2. One of the two bases 2 is fixed relative to the base 8, and the other base moves at a first speed relative to the base 8 under the driving of the corresponding slide rail 7. In addition, servo motors 1 arranged on the two bases 2 periodically rotate forwards and backwards, and drive the light cone blank 6 to rotate through the stretching rod 3.
Before S101, the outer stretching furnace 4 is operated to preheat the light cone blank 6. After the light cone blank 6 is preheated to a certain degree, the stretching inner furnace 5 is heated, the middle area of the light cone blank 6 is heated in a centralized manner, and the area corresponding to the light cone blank 6 is heated to a softening point.
During the movement of the stretching inner furnace 5 at the first speed, the stretching inner furnace 5 is still in operation, so that the portion of the light cone blank 6 located in the middle region of the stretching inner furnace 5 is always maintained at the softening point temperature.
It is contemplated that during the movement of the draw inner furnace 5 at the first speed, the draw inner furnace 5 moves in synchronization with the light cone blank 6, always heating the same position of the light cone blank 6, so that the light cone blank 6 assumes the shape as described in fig. 4.
After the light cone blank 6 is stretched to the preset size requirement according to the first speed, the movement of the stretching inner furnace 5 according to the first speed is stopped. In a particular application, the condition for stopping the drawing of the inner furnace 5 at the first speed may be to reach a predetermined moving time, to reach a predetermined moving distance or to make the size of the smallest section part of the light cone blank 6 reach a predetermined diameter.
In the embodiment of the present application, considering that the final-machined light cone blank 6 needs to reach a predetermined magnification, after the portion of the light cone blank 6 having the smallest cross-sectional area reaches a predetermined diameter, the movement of the stretching inner furnace 5 at the first speed is stopped, and the movement of the stretching inner furnace 5 at the second speed is started.
In this embodiment, the direction of the second speed is opposite to the first speed, and the ratio of the second speed to the first speed is k, k = a/b, where: a is the cross-sectional area of the light cone blank 6 in the area of the stretching inner furnace 5 when the stretching inner furnace 5 stops moving at the first speed, namely the cross-sectional area of the light cone blank 6 at the position with the smallest radius of the cross-sectional area; b is the cross-sectional area of the end region of the light cone blank 6.
In the process of moving the stretching inner furnace 5 at the second speed, the stretching inner furnace 5 is in a working state, so that the part of the light cone blank 6 in the stretching inner furnace 5 is always at the softening point temperature; since the light cone blank 6 is in the stretched state all the time, the portion thereof located in the stretching inner furnace 5 is stretched and thinned, and the cross-sectional area of the portion located in the stretching inner furnace 5 is always a.
And after the stretching inner furnace 5 is moved to the preset condition at the second speed, stopping the stretching inner furnace 5. The predetermined condition may be that the portion of the light cone blank 6 having the cross-sectional area a reaches a predetermined length, that the light cone blank 6 is stretched to a specific length, or that the stretching inner furnace 5 is moved at the second speed for a specific time. The light cone blank 6 is now shaped substantially as shown in figure 5.
After S101 is completed, the annealing procedure is started until the light cone blank 6 is cooled to room temperature, and then taken out of the horizontal drawing furnace, and S102 is performed.
S102: and cutting off the light cone blank in the area with the cross-sectional area a to obtain the light cone.
Two light cones can be obtained by cutting off the light cone in the area with the cross-sectional area a. As can be seen from fig. 5, the two cones are obtained by cutting the cone blank 6, but the shape of the smooth transition portions in the two cones is not the same.
In other embodiments of the present application, in order to obtain the shape of the smooth transition portion of the two light cones to be finally obtained, step S103 may be further performed after step S101 and step S102, and the light cone blank 6 passing through step S102 is shaped by step S103 until the two areas of the light cone blank 6 with smooth cross-sectional area are symmetrically arranged.
S104: moving the stretching inner furnace at a third speed.
In the process of executing S104, the step S101 is continuously executed, and the stretching inner furnace 5 is in an operating state, and the portion of the light cone blank 6 located in the stretching inner furnace 5 is ensured to be at a softening point. The third speed is opposite to the first speed and is the same as the first speed. After the step S104 is executed, after the degradation procedure is started until the light cone blank 6 is cooled to room temperature, the light cone blank 6 is moved from the area in the horizontal stretching furnace, and then the step S103 is executed, so that the light cone with the same smooth transition portion and the double straight regions can be obtained.
EXAMPLE III
FIG. 6 is a flow chart of a method for processing an optical fiber taper according to a third embodiment. As shown in fig. 6, the method for processing an optical fiber taper provided by the embodiment of the present application includes steps S201 to S202.
S201: and positioning the first end of the light cone blank, stretching the light cone blank at the second end at a first speed, rotating the light cone blank in a positive and negative rotation mode alternately, moving the stretching inner furnace at the first speed, and then moving the stretching inner furnace at a fourth speed.
In the embodiment of the application, one end of the light cone blank 6 is fixed on the stretching rod 3 corresponding to the left base 2 of the horizontal stretching furnace, and the other end is fixed on the stretching rod 3 corresponding to the right base. One of the two bases 2 is fixed relative to the base 8, and the other base moves at a first speed relative to the base 8 under the driving of the corresponding slide rail 7. In addition, servo motors 1 arranged on the two bases 2 periodically rotate forwards and backwards, and drive the light cone blank 6 to rotate through the stretching rod 3.
Before S101 is performed, the outer stretching furnace is operated to preheat the light cone blank 6. After the light cone blank 6 is preheated to a certain degree, the stretching inner furnace 5 is heated, the middle area of the light cone blank 6 is heated in a centralized manner, and the area corresponding to the light cone blank 6 is heated to a softening point.
During the movement of the stretching inner furnace 5 at the first speed, the stretching inner furnace 5 is still in operation, so that the portion of the light cone blank 6 located in the middle region of the stretching inner furnace 5 is always maintained at the softening point temperature.
It is contemplated that during the movement of the draw inner furnace 5 at the first speed, the draw inner furnace 5 moves in synchronization with the light cone blank 6, always heating the same position of the light cone blank 6, so that the light cone blank 6 assumes the shape as described in fig. 4.
After the light cone blank 6 is stretched to the preset size requirement according to the first speed, the movement of the stretching inner furnace 5 according to the first speed is stopped. In a particular application, the condition for stopping the drawing of the inner furnace 5 at the first speed may be to reach a predetermined moving time, to reach a predetermined moving distance or to make the size of the smallest section part of the light cone blank 6 reach a predetermined diameter.
In the embodiment of the present application, considering that the final-machined light cone blank 6 needs to reach a predetermined magnification, after the portion of the light cone blank 6 having the smallest cross-sectional area reaches a predetermined diameter, the movement of the stretching inner furnace 5 at the first speed is stopped, and the movement of the stretching inner furnace 5 at the fourth speed is started.
In this embodiment, the fourth speed and the first speed have the same direction, and the ratio of the fourth speed to the first speed is k +1, k = a/b, where: a is the cross-sectional area of the light cone blank 6 in the area of the stretching inner furnace 5 when the stretching inner furnace 5 stops moving at the first speed, namely the cross-sectional area of the light cone blank 6 at the position with the smallest radius of the cross-sectional area; b is the cross-sectional area of the end region of the light cone blank 6.
In the process of moving the stretching inner furnace 5 at the fourth speed, the stretching inner furnace 5 is in a working state, so that the part of the light cone blank 6 in the stretching inner furnace 5 is always at the softening point temperature; since the light cone blank 6 is in the stretched state all the time, the portion thereof located in the stretching inner furnace 5 is stretched and thinned, and the cross-sectional area of the portion located in the stretching inner furnace 5 is always a.
And after the stretching inner furnace 5 is moved to the preset condition at the fourth speed, stopping the stretching inner furnace 5. The predetermined condition may be that the portion of the light cone blank 6 having the cross-sectional area a reaches a predetermined length, that the light cone blank 6 is stretched to a specific length, or that the stretching inner furnace 5 is moved at the second speed for a specific time. The light cone blank 6 is now shaped substantially as shown in figure 5.
After S201 is completed, the annealing procedure is started until the light cone blank 6 is cooled to room temperature and then taken out of the horizontal drawing furnace, and S202 is performed.
S202: and cutting off the light cone blank in the area with the cross-sectional area a to obtain the light cone.
Two light cones can be obtained by cutting off the light cone in the area with the cross-sectional area a. As can be seen from fig. 5, the two cones are obtained by cutting the cone blank 6, but the shape of the smooth transition portions in the two cones is not the same.
In other embodiments of the present application, in order to obtain the shape of the smooth transition portion of the two light cones to be finally obtained, step S203 may be further performed between step S201 and step S202, and the light cone blank 6 passing through step S201 is shaped by step S203 until the two areas of the light cone blank 6 with smooth cross-sectional area are symmetrically arranged.
S203: the stretching inner furnace 5 is moved at a fifth speed.
In the process of executing S203, the stretching step in step S201 is continuously executed, and the stretching inner furnace 5 is in an operating state, and the portion of the light cone blank 6 located in the stretching inner furnace 5 is ensured to be at the softening point. The fifth speed is the same as the first speed in the direction and the magnitude. After the step S204 is executed, after the degradation procedure is started until the light cone blank 6 is cooled to room temperature, the light cone blank 6 is moved from the area in the horizontal stretching furnace, and then the step S203 is executed, so that the light cone with the same smooth transition portion and the double straight regions can be obtained.
Example four
FIG. 7 is a flowchart of a method for processing an optical fiber taper according to the fourth embodiment. As shown in fig. 7, the method for processing an optical fiber taper provided by the embodiment of the present application includes steps S301 to S302.
S301: simultaneously stretching a light cone blank from two ends, and elongating the light cone blank at a first speed; and meanwhile, fixing the stretching inner furnace until the preset conditions are met, and moving the light cone blank at a sixth speed.
In the embodiment of the application, one end of the light cone blank 6 is fixed on the stretching rod 3 corresponding to the left base 2 of the horizontal stretching furnace, and the other end is fixed on the stretching rod 3 corresponding to the right base 2. The two bases 2 are moved in opposite directions so that the light cone blank is stretched at a first speed. In addition, the servo motors 11 installed on the two bases 22 periodically rotate forward and backward, and drive the light cone blank 6 to rotate through the stretching rods 33.
Before the subsequent operation, the outer stretching furnace works to preheat the light cone blank 6. After the light cone blank 6 is preheated to a certain degree, the stretching inner furnace 5 is heated, the middle area of the light cone blank 6 is heated in a concentrated mode, the area corresponding to the light cone blank 6 is heated to a softening point, and then S301 is executed.
During the process of fixing the stretching inner furnace 5 and stretching the light cone blank 6 at the first speed, the stretching inner furnace 5 is still in a working state, so that the part of the light cone blank 6 positioned in the middle area of the stretching inner furnace 5 is always maintained at the softening point temperature.
It is contemplated that during the drawing of the cone blank 6 at the first speed, the draw inner furnace 5 always heats the same location of the cone blank 6 such that the cone blank 6 assumes the shape depicted in fig. 4.
And fixing the stretching inner furnace 5 until the preset conditions are met, and moving the light cone blank 6 at a sixth speed. In a particular application, the predetermined condition is that a predetermined travel time is reached, that the light cone blank 6 reaches a predetermined travel distance, or that the size of the smallest cross-sectional portion of the light cone blank 6 reaches a predetermined diameter.
In the present embodiment, the ratio of the sixth speed at which the stretching inner furnace 5 moves to the first speed is p, p =2a/b, where: a is the cross-sectional area of the light cone blank 6 in the area of the stretching inner furnace 5 when the stretching inner furnace 5 stops moving at the first speed, namely the cross-sectional area of the light cone blank 6 at the position with the smallest radius of the cross-sectional area; b is the cross-sectional area of the end region of the light cone blank 6.
In the process of moving the stretching inner furnace 5 at the sixth speed, the stretching inner furnace 5 is in a working state, so that the part of the light cone blank 6 in the stretching inner furnace 5 is always at the softening point temperature; since the light cone blank 6 is in the stretched state all the time, the portion thereof located in the stretching inner furnace 5 is stretched and thinned, and the cross-sectional area of the portion located in the stretching inner furnace 5 is always a.
And after the stretching inner furnace 5 is moved to the preset condition at the sixth speed, stopping the stretching inner furnace 5. The predetermined condition may be that the portion of the light cone blank 6 having the cross-sectional area a reaches a predetermined length, that the light cone blank 6 is stretched to a specific length, or that the stretching inner furnace 5 is moved at the second speed for a specific time. The light cone blank 6 is now shaped substantially as shown in figure 5.
After S301 is completed, the annealing procedure is started until the light cone blank 6 is cooled to room temperature, and then taken out of the horizontal drawing furnace, and S302 is performed.
S302: and cutting off the light cone blank 6 in the area with the cross section area a to obtain the light cone.
Two light cones can be obtained by cutting off the light cone in the area with the cross-sectional area a. As can be seen from fig. 5, the two cones are obtained by cutting the cone blank 6, but the shape of the smooth transition portions in the two cones is not the same.
In other embodiments of the present application, in order to obtain the shape of the smooth transition portion of the two light cones to be finally obtained, step S303 may be further performed between step S301 and step S302, and the light cone blank 6 passing through step S302 is shaped by step S303 until the two areas of the light cone blank 6 with smooth cross-sectional area are symmetrically arranged.
S303: and (5) fixing the stretching inner furnace.
In the process of executing S303, the stretching step in step S301 is continuously executed, and the stretching inner furnace 5 is in an operating state, and the portion of the light cone blank 6 located in the stretching inner furnace 5 is ensured to be at the softening point. The fifth speed is the same as the first speed in the direction and the magnitude. After the step S304 is executed, after the degradation procedure is started until the light cone blank 6 is cooled to room temperature, the light cone blank 6 is moved from the area in the horizontal stretching furnace, and then the step S302 is executed, so as to obtain the light cone with the double straight regions and the same smooth transition portion.
EXAMPLE five
The drawing method of the optical fiber cone provided by the embodiment of the application adopts a vertical drawing furnace. In describing the drawing process in detail, a vertical drawing furnace will be described first. FIG. 8 is a schematic structural view of a vertical stretching furnace used in example five. As shown in fig. 8, the vertical stretching furnace comprises a machine base, a slide rail 2, a fixed base 3, a stretching outer furnace 6, a stretching inner furnace 7, a stretching rod 4 and an infrared diameter gauge 8; the sliding rail 2 is arranged on the base 1 and can move on the base 1 along the vertical direction, and the fixed base 3 is arranged on the sliding rail 2 and can be vertically put down along with the sliding rail 2 to move; the stretching rod 4 is hung on the fixed base 3; the stretching outer furnace 6 is installed on the base 1, and the stretching inner furnace 7 is disposed inside the stretching outer furnace 6 and is movable in the vertical direction with respect to the base 1.
FIG. 9 is a flowchart of a method for processing an optical fiber taper according to the fifth embodiment. As shown in fig. 9, the stretching method provided in the embodiment of the present application includes steps S401 to S403.
S401, heating the part of the light cone blank in the stretching inner furnace by using the stretching inner furnace until the part of the light cone blank in the stretching inner furnace reaches the preset section size.
Before executing S401, the light cone blank 5 is vertically hung on a stretching rod 4 of a vertical stretching furnace, and the light cone blank 5 is heated by utilizing a stretching outer furnace 6, so that the light cone blank 5 is fully preheated.
Then, operating the stretching inner furnace 7, and heating the part of the light cone blank 5 in the stretching inner furnace 7 by using the stretching inner furnace 7; after the part of the light cone blank 5 in the stretching inner furnace 7 is heated to the softening point, the light cone blank 5 heated to the softening point moves downwards under the action of gravity, so that the part of the light cone blank 5 in the stretching inner furnace 7 is gradually thinned; meanwhile, the infrared diameter measuring instrument 8 is used for measuring the section size of the light cone blank 5 in the stretching inner furnace 7 in real time. S402 is performed when the measured sectional size reaches the preset sectional size.
S402: and (3) enabling the light cone blank to move in the vertical direction relative to the stretching inner furnace, and enabling the part of the light cone blank positioned in the stretching inner furnace to keep the preset section size.
In the process of S402, the stretching inner furnace 7 is still in operation, and the light cone blank 5 located therein is at the softening point temperature. Meanwhile, the infrared diameter measuring instrument 8 measures whether the sectional dimension of the part of the light cone blank 5, which is positioned in the stretching inner furnace 7, is the preset sectional dimension.
If the section size is the preset section size, the stretching inner furnace 7 is kept to move relative to the light cone blank 5; if the cross-sectional dimension is greater than the predetermined cross-sectional dimension, the bare ingot is moved relative to the draw furnace 7.
In step S402, the light cone blank 5 may be moved not in the vertical direction but the stretching inner furnace 7; it is also possible to move the light cone blank 5 downwards without moving the stretching inner furnace 7. In some special cases, it is possible to move the cone blank 5 and the stretching inner furnace 7 simultaneously.
And stopping the stretching inner furnace 7 after the area of the light cone blank 5 with the cross section of the preset cross section size reaches the preset condition or the preset time of S402 is executed. Starting an annealing procedure until the light cone blank 5 is cooled to room temperature and then taking out the light cone blank from the vertical stretching furnace
S403: and cutting off the light cone blank in an area with the cross section of a preset section size to obtain the light cone.
And cutting the light cone blank 5 in a preset section size area to obtain two light cones. The two cones are obtained by cutting off the cone blank 56, but the shape of the smooth transitions in the two cones may not be the same.
In practical application, step S404 may be further executed in the process of heating the light cone blank 5 in the stretching inner furnace 7;
the light cone blank 5 is rotated alternately in forward and reverse directions. Conceivably, the light cone blank 5 is rotated in the forward and reverse directions alternately, so that the shape of the light cone blank 5 is more uniform, the problem of different stretching degrees caused by nonuniform heating of the stretching inner furnace 7 is avoided, and the defective rate of the finally formed light cone is reduced.
After the processing method in the first to fifth embodiments is performed, a post-processing treatment may be performed on the processed light cone to obtain a light cone with a specific structure. For example, the large and small end face portions of the optical taper may be milled to make them rectangular.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features may be interchanged with other features disclosed in this application, but not limited to those having similar functions.
Claims (3)
1. A processing method of optical fiber cone adopts a horizontal drawing furnace to draw a light cone blank to form; characterized in that the method comprises:
positioning a first end of the light cone blank, stretching the light cone blank at a second end at a first speed, and rotating the light cone blank alternately in forward and reverse directions; simultaneously, moving the stretching inner furnace at a first speed, and then moving the stretching inner furnace at a second speed;
wherein: the second speed is opposite to the first speed in direction, and the ratio of the second speed to the first speed is a/b; a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed; b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area a to obtain the optical fiber cone.
2. A processing method of optical fiber cone adopts a horizontal drawing furnace to draw a light cone blank to form; characterized in that the method comprises:
positioning a first end of the light cone blank, stretching the light cone blank at a second end at a first speed, and rotating the light cone blank alternately in forward and reverse directions; simultaneously, moving the stretching inner furnace at a first speed, and then moving the stretching inner furnace at a fourth speed;
wherein: the fourth speed and the first speed are in the same direction, the ratio of the fourth speed to the first speed is a/b +1, a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed, and b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area a to obtain the optical fiber cone.
3. A processing method of an optical fiber cone adopts a horizontal stretching furnace to straighten a light cone blank to form; characterized in that the method comprises:
simultaneously stretching the light cone blank from both ends, and elongating the light cone blank at a first speed;
meanwhile, when the inner furnace is fixed and stretched to meet the preset conditions, the light cone blank is moved at a sixth speed;
wherein: the ratio of the sixth speed to the first speed is 2a/b, wherein a is the cross-sectional area of the light cone blank in the stretching inner furnace area when the stretching inner furnace is moved at the first speed; b is the cross-sectional area of the end part of the light cone blank;
and cutting the light cone blank in the area with the cross-sectional area of c to obtain the optical fiber cone.
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| CN111323873B (en) * | 2020-03-31 | 2022-01-28 | 中国建筑材料科学研究总院有限公司 | Torsion forming method and device of large-size optical fiber image inverter |
| CN111777324B (en) * | 2020-07-09 | 2023-01-31 | 中国建筑材料科学研究总院有限公司 | Heating furnace, optical fiber tapering method, product prepared by method and application of product |
| CN112645587A (en) * | 2020-12-07 | 2021-04-13 | 中国建筑材料科学研究总院有限公司 | Optical fiber taper and processing device and processing method thereof |
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