CN110727045A - Optical fiber cone and its processing method - Google Patents

Abstract

The present application provides an optical fiber cone and a processing method thereof. The aforementioned optical fiber cone includes a large end surface, a small end surface and a smooth transition part; the smooth transition part is located between the large end surface and the small end surface; The plurality of optical fibers extend from the large end surface and the smooth transition part to the small end surface; in the large end surface, each optical fiber is arranged in parallel; in the small end surface, each optical fiber is arranged in parallel. In the optical fiber cone provided by the present application, each optical fiber is arranged in parallel in the large end surface and the small end surface. Compared with the existing single straight region light cone, the optical fiber cone is installed in an optical device, which is different from the optical fiber cone. Better coupling efficiency between other optics in the device.

Description

Optical fiber cone and its processing method

technical field

The present application relates to the technical field of optical devices, in particular to an optical fiber cone and a processing method thereof.

Background technique

Optical fiber cones (hereinafter referred to as light cones) are optical devices made of a large number of optical fibers through regular arrangement, heating, pressure fusion and stretching processes; It has a very small object-image distance, so it has become one of the core components of image enhancement devices, and is widely used in miniaturized image equipment and image digitization equipment.

Due to the limitation of the processing technology, the light cone formed by the blank after the stretching process can only be a single straight region light cone; that is, the extension direction of the optical fiber in the large end face area of the light cone is parallel to the axis of the light cone, while The angle between the extension direction of the optical fiber in the small end face area and the axis of the light cone is an acute angle (at present, the angle between the small end face of the general light cone and the axis of the light cone is mostly 30°-70°); in practical applications It has been verified that the existing single-straight region light cones can no longer meet the application requirements in terms of coupling efficiency and high-quality resolution.

SUMMARY OF THE INVENTION

The present application provides an optical fiber cone to solve the technical problems in the background part; in addition, the present application also provides a method for processing the aforementioned optical fiber cone.

The application provides an optical fiber cone, a large end face, a small end face and a smooth transition part; the smooth transition part is located between the large end face and the small end face;

The plurality of optical fibers constituting the optical fiber cone all extend from the large end surface and the smooth transition part to the small end surface;

On the large end portion, each of the optical fibers is arranged in parallel;

On the small end portion, the respective optical fibers are arranged in parallel.

Optionally, the end cross-section of the large end portion and/or the small end portion is rectangular.

The application provides a processing method for an optical fiber cone, which is formed by drawing a light cone blank in a horizontal drawing furnace; the method includes:

Positioning the first end of the light cone blank, stretching the light cone blank at a first speed at the second end, and rotating the light cone blank alternately in forward and reverse directions; at the same time, moving the drawing inner at a first speed After the furnace, move the drawing inner furnace at a second speed;

Wherein: the direction of the second speed is opposite to that of the first speed, and the ratio of the second speed to the first speed is a/b; The cross-sectional area of the cone blank located in the inner furnace area of the drawing; b is the cross-sectional area of the end of the light cone blank;

The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area a.

Optionally, after moving the inner drawing furnace at the second speed, the method further includes: moving the inner drawing furnace at a third speed until the two cross-sectional areas of the light cone blank are smoothly transitioned. The area is set symmetrically;

Wherein, the third speed and the first speed are opposite in direction and have the same magnitude.

The present application provides another method for processing an optical fiber cone, which is formed by drawing an optical cone blank in a horizontal drawing furnace; the method includes:

Positioning the first end of the light cone blank, stretching the light cone blank at a first speed at the second end, and rotating the light cone blank alternately in forward and reverse directions; at the same time, moving the drawing inner at a first speed After the furnace, move the drawing inner furnace at a fourth speed;

Wherein: the direction of the fourth speed and the first speed is the same, the ratio of the fourth speed to the first speed is a/b+1, and a is the end of moving the inner drawing furnace at the first speed , the cross-sectional area of the light-cone blank located in the drawing inner furnace region, and b is the cross-sectional area of the end of the light-cone blank;

The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area a.

Optionally, after moving the inner drawing furnace at a third speed, the method further includes: moving the inner drawing furnace at a fifth speed until the two cross-sectional areas of the light cone blank are smoothly transitioned. The area is set symmetrically;

Wherein, the fifth speed and the first speed have the same direction and the same magnitude.

The present application provides another method for processing an optical fiber cone, which is formed by straightening a light cone blank in a horizontal drawing furnace; the method includes:

Simultaneously stretch the light cone blank from both ends, and elongate the light cone blank at a first speed;

At the same time, when the inner drawing furnace is fixed 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, and a is the cross section of the light cone blank located in the inner stretching furnace area when the inner stretching furnace is moved at the first speed area; b is the cross-sectional area of the end of the light cone blank;

The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area c.

Optionally, after the moving the light cone blank at the sixth speed, the method further includes: fixing the inner drawing furnace until two smooth transition areas of cross-sectional areas in the light cone blank are symmetrically arranged.

The present application provides another method for processing an optical fiber cone, which is obtained by processing in a vertical drawing furnace, and the method includes:

Use a drawing inner furnace to heat the part of the light cone blank located in the drawing inner furnace until the part of the light cone blank located in the drawing inner furnace reaches a preset cross-sectional size;

moving the light cone blank relative to the inner drawing furnace in a vertical direction, and making the part of the light cone blank located in the inner drawing furnace to maintain the preset cross-sectional size;

The optical fiber cone is obtained by truncating the optical cone blank in an area whose cross section is a predetermined cross-sectional size.

Optionally, the method further includes, in the process of heating the light cone blank in the drawing inner furnace, rotating the light cone blank alternately in forward and reverse directions.

In the optical fiber cone provided by the present application, each optical fiber is arranged in parallel in the large end surface and the small end surface. Compared with the existing single straight region light cone, the optical fiber cone is installed in an optical device, which is different from the optical fiber cone. Better coupling efficiency between other optics in the device.

Description of drawings

1 is a schematic cross-sectional view of an optical fiber cone provided by Embodiment 1;

2 is a schematic structural diagram of a horizontal drawing furnace used in the optical fiber cone processing method in Embodiments 2 to 4;

Fig. 3 is the flow chart of the optical fiber cone processing method provided by the second embodiment;

Fig. 4 is the longitudinal cross-sectional schematic diagram of the light cone blank formed after S101;

Fig. 5 is the longitudinal cross-sectional schematic diagram of the light cone blank formed after S102;

Fig. 6 is the flow chart of the optical fiber cone processing method provided by embodiment three;

Fig. 7 is the flow chart of the optical fiber cone processing method provided by embodiment four;

8 is a schematic structural diagram of a vertical stretching furnace adopted in Example 5;

Fig. 9 is the flow chart of the optical fiber cone processing method provided by embodiment five;

In Figure 1: 11-big end face, 12-small end face, 13-smooth transition part; in Figure 2: 1-servo motor, 2-base, 3-stretching rod, 4-stretching outer furnace, 5- Drawing inner furnace, 6-smooth cone blank, 7-slide rail, 8-base; in Fig. 4 and Fig. 5: 11-smooth 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, 8-infrared caliper.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

FIG. 1 is a schematic cross-sectional view of the optical fiber cone provided in the first embodiment. The optical fiber cone (hereinafter referred to as the light cone) provided by the embodiment of the present application is composed of a stretched light cone blank, and the aforementioned light cone blank is obtained by regularly arranging, heating and pressurizing 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 portion 13 is located between the large end surface portion 11 and the small end surface portion 12 . The plurality of optical fibers constituting the aforementioned light cone all extend from the large end surface portion 11 and the smooth transition portion 13 to the small end surface portion 12 . In the aforementioned large end surface portion 11 , each optical fiber is arranged in parallel; in the small end surface portion 12 , each optical fiber is also arranged in parallel.

Because each optical fiber is arranged in parallel on the large end surface portion 11 and the small end surface portion 12 , the light cone mentioned in the embodiments of the present application is called a double-straight region light cone. Compared with the existing single-straight region light cone, the light cone provided by the embodiments of the present application is installed in an optical device, and has better coupling efficiency with other optical devices in the optical device.

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, according to the shape of the optical device to be coupled, the large end surface portion 11 and the small end surface portion 12 can also be milled into a rectangular shape in cross section. In addition, the large end face and the small end face 12 of the light cone provided in the embodiment of the present application can also 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. Among them, Examples 2 to 4 use a horizontal stretching furnace to stretch the light cone blank to form a light cone, and Example 5 uses a vertical stretching furnace to stretch the light cone blank to form a light cone.

In order to better introduce the processing method of the light cone in the second embodiment to the fourth embodiment, the following briefly introduces the structure of the horizontal drawing furnace. FIG. 2 is a schematic structural diagram of a horizontal drawing furnace used in the optical fiber cone processing method in Embodiments 2 to 4; as shown in FIG. 2 , the horizontal drawing furnace includes a base 8, a slide rail 7, a base 2, a drawing Outer furnace 4, stretching inner furnace 5, servo motor 1, stretching rod 3. The slide rail 7 is installed on the base 8, the base 2 is installed on the slide rail 7, and can move with the slide rail 7; the stretching rod 3 is horizontally arranged on the base 2, and can clamp the light cone blank 6; the servo The motor 1 is installed on the base 2 and can control the rotation of the stretching rod 33 according to the driver program. The outer stretching furnace 4 is fixed on the base 8 ; the inner stretching furnace 5 is also installed on the base 8 , but can move along the extending direction of the stretching rod 3 . As shown in the figure, two bases 2 are provided on the base 8 ;

Embodiment 2

FIG. 3 is a flow chart of the optical fiber cone processing method provided in the second embodiment. As shown in FIG. 3 , the optical fiber cone processing method provided by the embodiment of the present application includes steps S101-S103.

S101: Position the first end of the light-cone blank, stretch the light-cone blank at the second end at a first speed, rotate the light-cone blank alternately in forward and reverse directions, move the inner furnace at the first speed, and then stretch the inner furnace at the first speed. The second speed moves the draw inner furnace.

In the embodiment of the present 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 . Among the aforementioned two bases 2 , one is fixed relative to the base 8 , and the other is moved relative to the base 8 at a first speed under the driving of the corresponding slide rail 7 . In addition, the servo motors 1 installed on the two bases 2 periodically rotate forward and reverse, and drive the light cone blank 6 to rotate through the stretching rod 3 .

Before performing S101 , the drawing outer furnace 4 works to preheat the light cone blank 6 . After the light cone blank 6 is preheated to a certain degree, the inner drawing furnace 5 is heated to work, and the central area of the light cone blank 6 is heated centrally, and the corresponding area of the light cone blank 6 is heated to the softening point.

During the process of moving the inner drawing furnace 5 at the first speed, the inner drawing furnace 5 is still in a working state, so that the part of the light cone blank 6 located in the middle area of the inner drawing furnace 5 is always maintained at the softening point temperature.

It is conceivable that in the process of moving the drawing inner furnace 5 at the first speed, the drawing inner furnace 5 and the light cone blank 6 move synchronously, and heat the same position of the light cone blank 6 all the time, so that the light cone blank 6 appears as shown in Figure 4 said shape.

After the light cone blank 6 is stretched to a predetermined size requirement according to the first speed, the inner stretching furnace 5 is stopped to move according to the first speed. In a specific application, the condition for stopping the drawing of the inner furnace 5 at the first speed may be reaching a predetermined moving time, reaching a predetermined moving distance, or making the size of the smallest section of the light cone blank 6 reach a predetermined diameter.

In the embodiment of the present application, considering that the optical cone blank 6 formed by final processing needs to reach a predetermined magnification, after the part with the smallest cross-sectional area of the optical cone blank 6 reaches the predetermined diameter, the moving and drawing at the first speed is stopped. the inner furnace 5 and start to move the inner furnace 5 at the second speed.

In this embodiment, the direction of the second speed is opposite to that of the first speed, and the ratio of the second speed to the first speed is k, k=a/b, where: a is the time when the inner drawing furnace 5 stops moving at the first speed , the cross-sectional area of the light-cone blank 6 in the area of the inner furnace 5 for drawing, that is, the cross-sectional area where the radius of the cross-sectional area of the light-cone blank 6 is the smallest; b is the cross-sectional area of the end region of the light-cone blank 6 .

In the process of moving the inner drawing furnace 5 at the second speed, the inner drawing furnace 5 is in a working state, so that the part of the light cone blank 6 located in the drawing inner furnace 5 is always at the softening point temperature; because the light cone blank 6 is always In the stretching state, the part located in the inner stretching furnace 5 is stretched and thinned, and the cross-sectional area of the part located in the inner stretching furnace 5 is always a.

After the inner stretching furnace 5 is moved at the second speed to the preset condition, the inner stretching furnace 5 is stopped from working. The aforementioned preset condition may be that the portion of the optical cone blank 6 with a cross-sectional area a reaches a predetermined length, or the optical cone blank 6 is stretched to a specific length, or the inner furnace 5 is moved at the second speed for a specific length. time. At this time, the shape of the light cone blank 6 is generally as shown in FIG. 5 .

After the completion of S101, the annealing procedure is started until the light cone blank 6 is cooled to room temperature and taken out from the horizontal drawing furnace, and S102 is performed.

S102 : truncate the light cone blank in a region with a cross-sectional area a to obtain a light cone.

Two light cones can be obtained after the aforementioned light cone is truncated in the region with the cross-sectional area a. As can be seen from FIG. 5 , two light cones are obtained after truncating the light cone blank 6 , but the shapes of the smooth transition portions in the two light cones are different.

In other embodiments of the present application, in order to obtain the shape of the smooth transition portion of the two light cones finally obtained, step S103 may also be performed between step S101 and step S102, and step S103 is used to perform step S103 on the light cone blank 6 that has passed through S102. The shaping is performed until the two regions in the light cone blank 6 where the cross-sectional areas are smoothly transitioned are symmetrically arranged.

S104: Move the inner drawing furnace at a third speed.

In the process of executing S104, step S101 is continued to be executed, and the inner drawing furnace 5 is in a working state to ensure that the part of the light cone blank 6 located in the inner drawing furnace 5 is at the softening point. The aforementioned third speed is opposite to the first speed and has the same magnitude as the first speed. After performing S104, after starting the degradation procedure, until the light cone blank 6 is cooled to room temperature, the light cone blank 6 is removed from the horizontal drawing furnace, and then S103 is performed, that is, a double-straight area light with the same smooth transition portion can be obtained. cone.

Embodiment 3

FIG. 6 is a flow chart of the optical fiber cone processing method provided in the third embodiment. As shown in FIG. 6 , the optical fiber cone processing method provided by the embodiment of the present application includes steps S201-S202.

S201: Position the first end of the light cone blank, stretch the light cone blank at the second end at a first speed, rotate the light cone blank alternately in forward and reverse directions, and move the inner furnace at the first speed, and then stretch the inner furnace at the first speed. The fourth speed moves the stretching inner furnace.

In the embodiment of the present 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. Among the aforementioned two bases 2 , one is fixed relative to the base 8 , and the other is moved relative to the base 8 at a first speed under the driving of the corresponding slide rail 7 . In addition, the servo motors 1 installed on the two bases 2 periodically rotate forward and reverse, and drive the light cone blank 6 to rotate through the stretching rod 3 .

Before executing S101, the outer furnace is drawn to work, and the light cone blank 6 is preheated. After the light cone blank 6 is preheated to a certain degree, the inner drawing furnace 5 is heated to work, and the central area of the light cone blank 6 is heated centrally, and the corresponding area of the light cone blank 6 is heated to the softening point.

During the process of moving the inner drawing furnace 5 at the first speed, the inner drawing furnace 5 is still in a working state, so that the part of the light cone blank 6 located in the middle area of the inner drawing furnace 5 is always maintained at the softening point temperature.

It is conceivable that in the process of moving the drawing inner furnace 5 at the first speed, the drawing inner furnace 5 and the light cone blank 6 move synchronously, and heat the same position of the light cone blank 6 all the time, so that the light cone blank 6 appears as shown in Figure 4 said shape.

After the light cone blank 6 is stretched to a predetermined size requirement according to the first speed, the inner stretching furnace 5 is stopped to move according to the first speed. In a specific application, the condition for stopping the drawing of the inner furnace 5 at the first speed may be reaching a predetermined moving time, reaching a predetermined moving distance, or making the size of the smallest section of the light cone blank 6 reach a predetermined diameter.

In the embodiment of the present application, considering that the optical cone blank 6 formed by final processing needs to reach a predetermined magnification, after the part with the smallest cross-sectional area of the optical cone blank 6 reaches the predetermined diameter, the moving and drawing at the first speed is stopped. the inner furnace 5 and start to move the inner furnace 5 at the fourth speed.

In this embodiment, the direction of the fourth speed is the same as that of the first speed, and the ratio of the fourth speed to the first speed is k+1, k=a/b, where: a is to stop moving the inner drawing furnace at the first speed 5, the cross-sectional area of the light-cone blank 6 in the area of the inner furnace 5, that is, the cross-sectional area of the light-cone blank 6 cross-sectional area with the smallest radius size; b is the cross-sectional area of the end region of the light-cone blank 6 .

In the process of moving the drawing inner furnace 5 at the fourth speed, the drawing inner furnace 5 is in a working state, so that the part of the light cone blank 6 located in the drawing inner furnace 5 is always at the softening point temperature; because the light cone blank 6 is always In the stretching state, the part located in the inner stretching furnace 5 is stretched and thinned, and the cross-sectional area of the part located in the inner stretching furnace 5 is always a.

After the inner stretching furnace 5 is moved to the preset condition at the fourth speed, the inner stretching furnace 5 is stopped from working. The aforementioned preset condition may be that the portion of the optical cone blank 6 with a cross-sectional area a reaches a predetermined length, or the optical cone blank 6 is stretched to a specific length, or the inner furnace 5 is moved at the second speed for a specific length. time. At this time, the shape of the light cone blank 6 is generally as shown in FIG. 5 .

After S201 is completed, the annealing procedure is started until the light cone blank 6 is cooled to room temperature and taken out from the horizontal drawing furnace, and S202 is performed.

S202 : truncate the light cone blank in a region with a cross-sectional area a to obtain a light cone.

Two light cones can be obtained after the aforementioned light cone is truncated in the region with the cross-sectional area a. As can be seen from FIG. 5 , two light cones are obtained after truncating the light cone blank 6 , but the shapes of the smooth transition portions in the two light cones are different.

In other embodiments of the present application, in order to obtain the final shape of the smooth transition portion of the two light cones, step S203 may also be performed between step S201 and step S202, and step S203 is used to perform step S203 on the light cone blank 6 passing through S201. The shaping is performed until the two regions in the light cone blank 6 where the cross-sectional areas are smoothly transitioned are symmetrically arranged.

S203: Move the inner drawing furnace 5 at the fifth speed.

In the process of executing S203, the stretching step in step S201 is continued to be executed, and the inner stretching furnace 5 is in a working state to ensure that the part of the light cone blank 6 located in the inner stretching furnace 5 is at the softening point. The aforementioned fifth speed is in the same direction as the first speed and has the same magnitude as the first speed. After performing S204, after starting the degradation procedure, until the light cone blank 6 is cooled down to room temperature, the light cone blank 6 is removed from the horizontal stretching furnace, and then S203 is performed, that is, a double-straight area light with the same smooth transition portion can be obtained. cone.

Embodiment 4

FIG. 7 is a flowchart of the optical fiber cone processing method provided in the fourth embodiment. As shown in FIG. 7 , the optical fiber cone processing method provided by the embodiment of the present application includes steps S301-S302.

S301: Simultaneously stretch the light cone blank from both ends, and elongate the light cone blank at a first speed; at the same time, when the inner stretching furnace is fixed until a preset condition is met, the light cone blank is moved at a sixth speed.

In the embodiment of the present 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 aforementioned two bases 2 move in opposite directions, so that the light cone blank is stretched at the first speed. In addition, the servo motors 11 installed on the two bases 22 periodically rotate forward and reverse, and drive the light cone blank 6 to rotate through the stretching rod 33 .

Before the subsequent operations, the outer furnace is drawn to work, and the light cone blank 6 is preheated. After the light cone blank 6 is preheated to a certain extent, the inner drawing furnace 5 is heated, and the central area of the light cone blank 6 is heated centrally, and the corresponding area of the light cone blank 6 is heated to the softening point, and then S301 is executed.

During the process of fixing the inner drawing furnace 5 and drawing the light cone blank 6 at the first speed, the drawing inner furnace 5 is still in a working state, so that the part of the light cone blank 6 located in the middle area of the drawing inner furnace 5 is always maintained at softening point temperature.

It is conceivable that in the process of drawing the light cone blank 6 at the first speed, the inner drawing furnace 5 always heats the same position of the light cone blank 6 so that the light cone blank 6 presents the shape as shown in FIG. 4 .

After the inner drawing furnace 5 is fixed until the predetermined condition is satisfied, the light cone blank 6 is moved at the sixth speed. In a specific application, the predetermined condition is that the predetermined moving time is reached, the optical cone blank 6 reaches a predetermined moving distance, or the size of the smallest section of the optical cone blank 6 reaches a predetermined diameter.

In this embodiment, the ratio of the sixth speed of the inner stretching furnace 5 to the first speed is p, p=2a/b, where: a is the light cone blank when the inner stretching furnace 5 stops moving at the first speed 6 is the cross-sectional area of the area located in the inner drawing furnace 5 , that is, the cross-sectional area at the point where the radius of the cross-sectional area of the light-cone blank 6 is the smallest; b is the cross-sectional area of the end region of the light-cone blank 6 .

In the process of moving the drawing inner furnace 5 at the sixth speed, the drawing inner furnace 5 is in a working state, so that the part of the light cone blank 6 located in the drawing inner furnace 5 is always at the softening point temperature; because the light cone blank 6 is always In the stretching state, the part located in the inner stretching furnace 5 is stretched and thinned, and the cross-sectional area of the part located in the inner stretching furnace 5 is always a.

After the inner stretching furnace 5 is moved to the preset condition at the sixth speed, the inner stretching furnace 5 is stopped from working. The aforementioned preset condition may be that the portion of the optical cone blank 6 with a cross-sectional area a reaches a predetermined length, or the optical cone blank 6 is stretched to a specific length, or the inner furnace 5 is moved at the second speed for a specific length. time. At this time, the shape of the light cone blank 6 is generally as shown in FIG. 5 .

After the completion of S301, the annealing procedure is started until the light cone blank 6 is cooled to room temperature and taken out from the horizontal drawing furnace, and S302 is performed.

S302 : truncate the light cone blank 6 in a region with a cross-sectional area a to obtain a light cone.

Two light cones can be obtained after the aforementioned light cone is truncated in the region with the cross-sectional area a. As can be seen from FIG. 5 , two light cones are obtained after truncating the light cone blank 6 , but the shapes of the smooth transition portions in the two light cones are different.

In other embodiments of the present application, in order to obtain the final shape of the smooth transition portion of the two light cones, step S303 may also be performed between step S301 and step S302, and step S303 is used to perform step S303 on the light cone blank 6 that has passed through S302. The shaping is performed until the two regions in the light cone blank 6 where the cross-sectional areas are smoothly transitioned are symmetrically arranged.

S303: Fixed stretching inner furnace.

In the process of executing S303, the stretching step in step S301 is continued, and the inner stretching furnace 5 is in the working state to ensure that the part of the light cone blank 6 located in the inner stretching furnace 5 is at the softening point. The aforementioned fifth speed is in the same direction as the first speed and has the same magnitude as the first speed. After S304 is executed, after starting the degradation process, until the light cone blank 6 is cooled to room temperature, the light cone blank 6 is removed from the horizontal drawing furnace area, and then S302 is executed, that is, the double-straight area light with the same smooth transition portion can be obtained. cone.

Embodiment 5

The stretching method of the optical fiber cone provided in the embodiment of the present application adopts a vertical stretching furnace. In the specific introduction of the drawing process, the vertical drawing furnace is first introduced. FIG. 8 is a schematic structural diagram of the vertical drawing furnace used in the fifth embodiment. As shown in Figure 8, the vertical stretching furnace includes a machine base, a sliding rail 2, a fixed base 3, an outer stretching furnace 6, an inner stretching furnace 7, a stretching rod 4 and an infrared caliper 8; the sliding rail 2 is installed On the base 1, it can move on the base 1 along the vertical direction, and the fixed base 3 is installed on the slide rail 2, and can move with the slide rail 2 when it is vertically lowered; the stretching rod 4 is hung on the fixed base On the base 3; the stretching outer furnace 6 is installed on the base 1, and the stretching inner furnace 7 is arranged in the stretching outer furnace 6, and can move relative to the base 1 in the vertical direction.

FIG. 9 is a flowchart of the optical fiber cone processing method provided in the fifth embodiment. As shown in FIG. 9 , the stretching method provided by the embodiment of the present application includes steps S401-S403.

S401 : using the inner drawing furnace to heat the part of the light cone blank located in the inner drawing furnace until the part of the light cone blank located in the inner drawing furnace reaches a preset cross-sectional size.

Before executing S401 , the light cone blank 5 is vertically hoisted on the drawing rod 4 of the vertical drawing furnace, and the light cone blank 5 is heated by the drawing outer furnace 6 to fully preheat the light cone blank 5 .

Then make the inner drawing furnace 7 work, and use the inner drawing furnace 7 to heat the part of the light cone blank 5 located in the inner drawing furnace 7; when the part of the light cone blank 5 located in the inner drawing furnace 7 is heated to the softening point , under the action of gravity, the light cone blank 5 heated to the softening point moves down, so that the part of the light cone blank 5 located in the drawing inner furnace 7 becomes gradually thinner; at the same time, the infrared caliper 8 is used to measure the light cone blank 5 in real time. The cross-sectional dimension of the light cone blank 5 in the inner drawing furnace 7 . S402 is executed when the measured section size reaches the preset section size.

S402: Move the light-cone blank relative to the inner drawing furnace in a vertical direction, and make the part of the light-cone blank located in the inner drawing furnace to maintain a preset cross-sectional size at last.

In the process of executing S402, the inner drawing furnace 7 is still in the working state, so that the light cone blank 5 located therein is at the softening point temperature. At the same time, the infrared caliper 8 measures whether the cross-sectional size of the portion of the light cone blank 5 located in the inner drawing furnace 7 is the preset cross-sectional size.

If the section size is the preset section size, keep the inner stretching furnace 7 moving relative to the light cone blank 5; if the section size is larger than the preset section size, move the light blank relative to the inner stretching furnace 7.

In the execution of S402, the light cone blank 5 may not move in the vertical reverse direction, but the drawing inner furnace 7 may be moved; or the light cone blank 5 may be moved downward without moving the drawing inner furnace 7. In some special cases, the light cone blank 5 and the drawing inner furnace 7 can be moved simultaneously.

After the area where the cross section of the light cone blank 5 is the preset size reaches the preset condition, or after the preset time in S402 is performed, the inner drawing furnace 7 is stopped from working. Start the annealing process until the light cone blank 5 is cooled down to room temperature and taken out from the vertical drawing furnace

S403 : truncate the light cone blank in a region where the cross section is a preset cross section size to obtain a light cone.

Two light cones can be obtained after the light cone blank 5 is truncated in the area of the preset cross-sectional size. Two light cones are obtained after truncating the light cone blank 56, but the shapes of the smooth transitions in the two light cones may not be the same.

In practical applications, in the process of heating the light cone blank 5 in the drawing inner furnace 7, step S404 may also be performed;

The light cone blank 5 is rotated alternately in forward and reverse directions. It is conceivable that rotating the light cone blank 5 alternately in the forward and reverse directions can make the shape of the light cone blank 5 more uniform, avoid the problem of different stretching degrees caused by uneven heating of the inner furnace 7, and then reduce the final formed. The defective rate of the light cone.

After the processing methods in Embodiments 1 to 5 are completed, post-processing can also be performed on the light cone formed by processing to obtain a light cone with a specific structure. For example, the large and small faces of the light cone can be milled to make the large and small faces rectangular.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover the above technical features or Other technical solutions formed by any combination of its equivalent features. For example, a technical solution is formed by replacing the above features with the technical features disclosed in this application but not limited to having similar functions.

Claims (10)

1. an optical fiber cone, is characterized in that: comprise large end face part, small end face part and smooth transition part; Described smooth transition part is located between described large end face part and described small end face part; The plurality of optical fibers constituting the optical fiber cone all extend from the large end surface and the smooth transition part to the small end surface; On the large end portion, each of the optical fibers is arranged in parallel; On the small end portion, the respective optical fibers are arranged in parallel. 2. The optical fiber cone according to claim 1, wherein: The end cross-section of the large end face portion and/or the small end face portion is rectangular. 3. A method for processing an optical fiber cone as claimed in claim 1, wherein the optical cone blank is drawn by a horizontal drawing furnace to form; it is characterized in that, the method comprises: Positioning the first end of the light cone blank, stretching the light cone blank at a first speed at the second end, and rotating the light cone blank alternately in forward and reverse directions; at the same time, moving the drawing inner at a first speed After the furnace, move the drawing inner furnace at a second speed; Wherein: the direction of the second speed is opposite to that of the first speed, and the ratio of the second speed to the first speed is a/b; The cross-sectional area of the cone blank located in the inner furnace area of the drawing; b is the cross-sectional area of the end of the light cone blank; The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area a. 4. The processing method of the optical fiber cone according to claim 3, wherein, After the moving the inner drawing furnace at the second speed, the method further includes: moving the inner drawing furnace at a third speed until the two regions with smooth transition of cross-sectional areas in the light cone blank are symmetrically arranged ; Wherein, the third speed and the first speed are opposite in direction and have the same magnitude. 5. A method for processing an optical fiber cone as claimed in claim 1, wherein the optical cone blank is drawn by a horizontal drawing furnace to form; it is characterized in that, the method comprises: Positioning the first end of the light cone blank, stretching the light cone blank at a first speed at the second end, and rotating the light cone blank alternately in forward and reverse directions; at the same time, moving the drawing inner at a first speed After the furnace, move the drawing inner furnace at a fourth speed; Wherein: the direction of the fourth speed and the first speed is the same, the ratio of the fourth speed to the first speed is a/b+1, and a is the end of moving the inner drawing furnace at the first speed , the cross-sectional area of the light-cone blank located in the drawing inner furnace region, and b is the cross-sectional area of the end of the light-cone blank; The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area a. 6. The processing method of an optical fiber cone according to claim 5, wherein, After the moving the inner drawing furnace at a third speed, the method further includes: moving the inner drawing furnace at a fifth speed until two regions in the light cone blank with smooth transition of cross-sectional areas are symmetrically arranged ; Wherein, the fifth speed and the first speed have the same direction and the same magnitude. 7. A processing method for an optical fiber cone as claimed in claim 1, which is formed by using a horizontal drawing furnace to straighten a light cone blank; it is characterized in that the method comprises: Simultaneously stretch the light cone blank from both ends, and elongate the light cone blank at a first speed; At the same time, when the inner drawing furnace is fixed 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, and a is the cross section of the light cone blank located in the inner stretching furnace area when the inner stretching furnace is moved at the first speed area; b is the cross-sectional area of the end of the light cone blank; The optical fiber cone is obtained by truncating the optical cone blank in a region with a cross-sectional area c. 8. The processing method of an optical fiber cone according to claim 7, wherein, After the moving the light cone blank at the sixth speed, the method further includes: fixing the inner drawing furnace until two smooth transition areas of cross-sectional areas in the light cone blank are symmetrically arranged. 9. A method for processing an optical fiber cone as claimed in claim 1, obtained by processing in a vertical drawing furnace, wherein the method comprises: Use a drawing inner furnace to heat the part of the light cone blank located in the drawing inner furnace until the part of the light cone blank located in the drawing inner furnace reaches a preset cross-sectional size; moving the light cone blank relative to the inner drawing furnace in a vertical direction, and making the part of the light cone blank located in the inner drawing furnace to maintain the preset cross-sectional size; The optical fiber cone is obtained by truncating the optical cone blank in an area whose cross section is a predetermined cross-sectional size. 10. The method for processing an optical fiber cone according to claim 9, wherein, The method further includes, during the process of heating the light cone blank in the drawing inner furnace, rotating the light cone blank alternately in forward and reverse directions.

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