JP4593240B2 - Glass rod-shaped body processing apparatus and glass rod-shaped body processing method using the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a glass rod-shaped body processing apparatus and a glass rod-shaped body processing method using the same, and in particular, a glass rod-shaped body processing apparatus used when flame-polishing the surface of an optical fiber preform, and The present invention relates to a method for processing a glass rod using this.

  To manufacture an optical fiber preform, first, a soot body is formed by spraying a raw material gas of glass fine particles together with an oxyhydrogen flame onto a starting member by a VAD (Vapor Phase Axial Deposition) method or the like. Next, the soot body is dehydrated at about 1200 ° C. with an electric furnace or the like, and then sintered at about 1500 ° C. to form a transparent glass, thereby producing a glass rod-like body. Next, the glass rod-like body is stretched to have a predetermined outer diameter, and glass fine particles are externally attached to the outer periphery thereof by an external attachment method or the like to produce a porous preform for optical fiber. Thereafter, the porous optical fiber preform is dehydrated and sintered to obtain an optical fiber preform.

  In the production of an optical fiber preform, the surface of the optical fiber preform obtained by dehydrating and sintering the glass rod-like body and the optical fiber porous preform in the process of producing the optical fiber preform. It is necessary to remove the scratches and foreign objects present in the. Therefore, before the glass rod-shaped body and the optical fiber preform are stretched and after dehydration and sintering, the surfaces of the glass rod-shaped body and the optical fiber preform are subjected to flame polishing with an oxyhydrogen flame. . Hereinafter, in order to simplify the explanation, a glass rod-like body obtained by dehydrating and sintering a glass rod-like body in the process of manufacturing an optical fiber preform and a porous preform for an optical fiber is made into a glass rod-like body. Collectively.

FIG. 6 is a schematic diagram showing a conventional optical fiber preform processing apparatus.
In order to flame polish the surface of the glass rod-like body 100, the glass rod-like body 100 is held by an optical fiber preform processing apparatus (hereinafter abbreviated as “optical fiber preform processing apparatus”) 110. 111, and is rotated by the first motor 112 around the optical axis. In this state, while the oxyhydrogen burner 113 provided in the processing apparatus 110 is moved along the longitudinal direction of the glass rod-shaped body 100 by the second motor 114, the oxyhydrogen flame blown out from the oxyhydrogen burner 113 is glass rod-shaped body. By spraying on the surface of 100, the surface of the glass rod-shaped body 100 is heated. Thereby, the quartz glass which makes the surface of the glass rod-shaped body 100 is thermally decomposed, and scratches and foreign matters existing on the surface of the glass rod-shaped body 100 are removed.

According to the conventional flame polishing method, a part of the decomposed quartz glass is evaporated as silicon oxide (SiO), but the evaporated silicon oxide is combined with oxygen in the atmosphere, and from silicon dioxide (SiO ₂ ). It becomes glass fine particles and adheres again to the surface of the glass rod. There was a problem that the surface of the glass rod was clouded white due to the glass fine particles adhering again to the surface of the glass rod (see, for example, Patent Document 1).

  Therefore, in order to solve this problem, when the surface of the glass rod-shaped body is heated with an oxyhydrogen flame having a low calorific value, the fogging of the surface can be removed, but if the heating time is insufficient, the fogging is completely eliminated. Could not be removed. On the other hand, if the heating time is longer than necessary, there is a problem that clouding occurs again.

  In addition, if the amount of heat of the oxyhydrogen flame is lowered to suppress the evaporation of silicon oxide, not only the scratches and foreign substances present on the surface of the glass rod can be removed, but also the annealing of the glass rod is incomplete. Thus, there is a problem that a large strain remains inside the glass rod.

Further, if the defogging treatment is performed separately from the flame polishing in order to remove the mist on the surface of the glass rod-like body, the number of steps increases, resulting in an increase in manufacturing cost.
JP 2000-203861 A

  The present invention has been made in view of the above circumstances, and in the flame polishing of a glass rod-shaped body, a glass rod-shaped body processing apparatus that suppresses fogging generated on the surface of the glass rod-shaped body, and a glass rod-shaped body processing method using the same. The purpose is to provide.

In order to solve the above-mentioned problems, the present invention provides a supporting means for rotatably supporting a glass rod-shaped body around its axis, and a heating device facing the glass rod-shaped body and movable along the longitudinal direction thereof. And clouding caused by redeposition of glass particles scattered from the glass rod-like body by heating of the heating means, which is moved in synchronism with the heating means and at least rearward in the traveling direction thereof, to the surface of the glass rod-like body is suppressed. Fogging suppression means, and the fogging suppression means is a shielding member formed by connecting a plurality of cylindrical members having different outer diameters and having a through hole for inserting the glass rod-like body. The glass rod-shaped body is stretchable along the longitudinal direction, and the shielding member includes a support portion that extends from the outer periphery of the glass rod-like body and is attached to the heating means. Providing processing apparatus movable der Ru glass rod-like body along a longitudinal direction of the lath the rod-like body.

The present invention provides a supporting means for rotatably supporting a glass rod-shaped body around its axis, a heating means facing the glass rod-shaped body and movable along the longitudinal direction thereof, and synchronized with the heating means. And the glass that suppresses fogging caused by redeposition of the glass particles scattered from the glass rod-like body to the surface of the glass rod-like body by heating of the heating means disposed at least rearward in the traveling direction thereof, and the glass An exhaust port for sucking the glass fine particles, and the fog suppression means is a semi-disc-shaped partition member, and the partition member is the glass rod-shaped body. The part heated by the heating means and at least a part of the other part are partitioned, and the partition member includes a support portion that extends from the outer periphery and is attached to the heating means. , Provides a processing apparatus for a glass rod member is movable along the longitudinal direction of the glass rod-shaped body with said heating means.

The present invention provides a supporting means for rotatably supporting a glass rod-shaped body around its axis, a heating means facing the glass rod-shaped body and movable along the longitudinal direction thereof, and synchronized with the heating means. And the glass that suppresses fogging caused by redeposition of the glass particles scattered from the glass rod-like body to the surface of the glass rod-like body by heating of the heating means disposed at least rearward in the traveling direction thereof, and the glass An exhaust port for sucking the glass fine particles, the fogging suppression means is a semi-cylindrical shielding member, and the shielding member is the glass rod-like body. wherein a portion to be heated by the heating means, the partition and at least a portion of the other portions, the shielding member, Bei a support that its extends from the outer periphery attached to said heating means , Provides a processing apparatus for a glass rod member is movable along the longitudinal direction of the glass rod-shaped body with said heating means.

In the processing apparatus of the glass rod-like body of the above structure, the glass rod-like body is preform der Rukoto optical fiber preferred.

In the processing apparatus of the glass rod-like body having the above-described configuration, the heating means Oh Rukoto preferably an oxyhydrogen burner.

In the glass rod-shaped body processing apparatus having the above-described configuration, it is preferable that the processing of the glass rod-shaped body is surface polishing of the glass rod-shaped body by heating of the heating means .

The present invention, while rotating the glass rod around its axis, moves the heating means opposed to the glass rod along the longitudinal direction of the glass rod to heat the glass rod, and at least the A longitudinal direction of the glass rod-shaped body comprising a shielding member formed by connecting a plurality of cylindrical members having different outer diameters and having a through-hole for inserting the glass rod-shaped body, which is arranged rearward in the traveling direction of the heating means. The fogging suppression means that can expand and contract along the glass rod is synchronized with the moving speed of the heating means, followed by the heating means, and extended along the longitudinal direction of the glass rod-like body, The glass rod surface by reattachment of the glass fine particles scattered from the glass rod body by heating of the heating means by covering all the parts that have been heated by the heating means. It provides a method for processing a glass rod member suppress fogging of.

The present invention, while rotating the glass rod around its axis, moves the heating means opposed to the glass rod along the longitudinal direction of the glass rod to heat the glass rod, and at least the A fog suppression means comprising a semi-disc-shaped partition member arranged behind the heating means in the traveling direction and partitioning a portion heated by the heating means of the glass rod-like body and at least a part of the other portions; Synchronize with the moving speed of the heating means, follow the heating means, and from the glass rod-like body by heating the heating means by an exhaust port arranged so as to face the heating means with the glass rod-like body interposed therebetween. by sucking the glass particles to scatter, the processing method of fogging suppressing glass rod-like body of the glass rod-shaped body surface by redeposition of the front Kiga Las microparticles Hisage To.

The present invention, while rotating the glass rod around its axis, moves the heating means opposed to the glass rod along the longitudinal direction of the glass rod to heat the glass rod, and at least the A fog suppression means comprising a semi-cylindrical shielding member that is arranged behind the heating means in a traveling direction and partitions a portion heated by the heating means of the glass rod-like body and at least a part of the other portions; Synchronize with the moving speed of the heating means, follow the heating means, and from the glass rod-like body by heating the heating means by an exhaust port arranged so as to face the heating means with the glass rod-like body interposed therebetween. by sucking the glass particles to scatter, the processing method of fogging suppressing glass rod-like body of the glass rod-shaped body surface by redeposition of the front Kiga Las microparticles Hisage To.

  According to the glass rod-like body processing apparatus of the present invention, in the polishing of the surface of the glass rod-like body by the heating means, the fogging suppression means is provided behind the heating direction of the heating means so as to be synchronized with the heating means. Thus, the glass fine particles scattered from the glass rod-like body by the heating of the heating means are reattached to the surface of the glass rod-like body, thereby suppressing fogging generated in the glass rod-like body. Furthermore, it is not necessary to perform the defrosting process on the surface of the glass rod-like body, and the processing time and the manufacturing cost can be greatly reduced as compared with the conventional method. In addition, the residual strain inside the glass rod-like body is equivalent to the conventional one, and is not affected by the installation of the partition member or the shielding member.

  According to the processing method of the processing apparatus of the glass rod-shaped body of the present invention, in the polishing of the surface of the glass rod-shaped body by the heating means, the fogging suppression means is heated behind the moving direction of the heating means so as to synchronize with the heating means. By following the means, the surface of the glass rod-shaped body is polished to remove scratches and foreign matter on the surface of the glass rod-shaped body, and the glass particles scattered from the glass rod-shaped body by heating by the heating means are again glass rod-shaped body. It can suppress adhering to the surface. Further, the residual strain inside the glass rod-like body is the same as when polished by a conventional method and is not affected by the provision of the partition member.

  Hereinafter, a glass rod-shaped processing apparatus and a glass rod-shaped processing method using the same according to the present invention will be described with reference to the drawings.

(First embodiment)
1st embodiment of the processing apparatus of the glass rod-shaped body which concerns on this invention is described.
FIG. 1 is a schematic diagram showing a first embodiment of a glass rod-like processing apparatus according to the present invention.
In FIG. 1, reference numeral 10 denotes a glass rod-like body, 20 denotes a glass rod-like body processing device, 21 denotes a support portion, 22 denotes a partition member, 23 denotes an oxyhydrogen burner, 24 denotes a first motor, 25 denotes a second motor, Reference numeral 26 denotes a support portion, and 27 denotes a ball screw.

  This optical fiber preform processing apparatus 20 includes a support portion 21, a partition member 22, an oxyhydrogen burner 23, a first motor 24, a second motor 25, a support portion 26, a ball screw 27, and the like. It is roughly composed.

The support portion 21 is provided so as to support the glass rod-like body 10 so as to be rotatable about its axis 10a.
Further, the glass rod-like body 10 is rotated about the shaft 10 a by the first motor 24 in a state where it is supported by the support portion 21.

  Further, the oxyhydrogen burner 23 is disposed so as to face the glass rod-shaped body 10, and is movable along the longitudinal direction of the glass rod-shaped body 10 by the second motor 25 via the ball screw 27. Yes.

  At the rear of the oxyhydrogen burner 23 in the traveling direction, a disc-shaped partition member 22 having a center hole 22a for inserting the glass rod-shaped body 10 is provided at the center thereof. The partition member 22 includes a support portion 26 that extends from the outer periphery thereof and is attached to the oxyhydrogen burner 23. Thereby, the partition member 22 is movable along the longitudinal direction of the glass rod 10 in synchronization with the moving speed of the oxyhydrogen burner 23.

  The size of the partition member 22 is appropriately adjusted according to the size of the oxyhydrogen burner 23, the heat amount (temperature) of the flame blown out from the oxyhydrogen burner 23, and the like.

  The material of the partition member 22 is not particularly limited as long as it is not deformed by the heat of the oxyhydrogen flame blown from the oxyhydrogen burner 23, and any material such as metal, glass, ceramics can be used.

  According to the processing apparatus 20 of the glass rod-shaped body of this embodiment, at least a part of the outer periphery of the glass rod-shaped body 10 is surrounded behind the oxyhydrogen burner 23 so as to be synchronized with the oxyhydrogen burner 23. Since the partition member 22 is provided as described above, the glass particles scattered from the glass rod-like body 10 due to the heating of the oxyhydrogen burner 23 are reattached to the surface of the glass rod-like body 10, thereby causing the cloudiness generated in the glass rod-like body 10. Can be suppressed.

  In this embodiment, the disk-shaped partition member 22 is exemplified as the fog suppression means for suppressing the fog generated in the glass rod 10 by reattaching to the surface of the glass rod 10, but the glass of the present invention. The rod-shaped body processing apparatus is not limited to this. In the glass rod-shaped body processing apparatus of the present invention, the glass fine particles generated by disassembling a part of the glass rod-shaped body are not heated by the oxyhydrogen flame blown from the oxyhydrogen burner on the surface of the glass rod-shaped body. Any shape fogging suppression means can be applied as long as it has a shape that can be prevented from scattering and adhering to the portion.

  Moreover, in this embodiment, although the one partition member 22 provided in the back of the advancing direction of the oxyhydrogen burner 23 was illustrated as a fog suppression means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the processing apparatus for a glass rod-like body of the present invention, it is sufficient that the fogging suppression means is provided at least behind the traveling direction of the oxyhydrogen burner. Therefore, the fog suppression means may be provided in front of the traveling direction of the oxyhydrogen burner.

  Moreover, in this embodiment, although the oxyhydrogen burner 23 was illustrated as a heating means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the apparatus for processing a glass rod-like body of the present invention, a gas burner, a plasma flame or the like may be used as a heating means.

Next, with reference to FIG. 1, the processing method of the glass rod-shaped body using the glass rod-shaped processing apparatus of this embodiment is demonstrated.
First, the shaft 10a of the glass rod-shaped body 10 manufactured by publicly known methods such as the VAD method is mounted on the support portion 21 of the glass rod-shaped processing apparatus 20.

  In this state, the oxyhydrogen burner 23 opposed to the glass rod 10 while rotating the glass rod 10 about the shaft 10 a by the first motor 24 is arranged along the longitudinal direction of the glass rod 10. It is moved and the glass rod-shaped body 10 is heated. Further, the partition member 22 provided integrally with the oxyhydrogen burner 23 and the support portion 26 and arranged behind the oxyhydrogen burner 23 in the traveling direction is synchronized with the moving speed of the oxyhydrogen burner 23, and the acid Following the hydrogen burner 23, the glass rod 10 is moved along the longitudinal direction. The partition member 22 is moved by the power of the second motor 25 via the ball screw 27.

  By the way, in order to remove scratches and foreign matter on the surface of the glass rod-like body 10 by polishing the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 23, a unit in the longitudinal direction of the surface of the glass rod-like body 10 is used. In order to maintain the necessary polishing amount (g / mm) per length, heat must be sufficiently transferred to the inside of the glass rod 10 so as not to leave a large strain inside the glass rod 10. . In addition to this, it is necessary to prevent glass fine particles generated by heating with the oxyhydrogen burner 23 from adhering again to the surface of the glass rod 10.

 Therefore, in this embodiment, the partition member 22 is placed behind the oxyhydrogen burner 23 in the traveling direction so as to surround at least a part of the outer periphery of the glass rod 10 so as to synchronize with the oxyhydrogen burner 23. By following the above, the surface of the glass rod-shaped body 10 is polished to remove scratches and foreign matter on the surface of the glass rod-shaped body 10, and the glass fine particles scattered from the glass rod-shaped body 10 by heating the oxyhydrogen burner 23 are The adhesion to the surface of the glass rod 10 can be suppressed again. Further, the residual strain inside the glass rod-like body 10 is equivalent to that when polished by a conventional method, and is not affected by the provision of the partition member 22.

(Second embodiment)
2nd embodiment of the processing apparatus of the glass rod-shaped body which concerns on this invention is described.
FIG. 2 is a schematic view showing a second embodiment of the processing apparatus for glass rods according to the present invention.
In FIG. 2, reference numeral 10 denotes a glass rod-like body, 30 denotes a glass rod-like body processing device, 31 denotes a support portion, 32 denotes a shielding member, 33 denotes an oxyhydrogen burner, 34 denotes a first motor, 35 denotes a second motor, Reference numeral 36 denotes a support portion, and 37 denotes a ball screw.

  The optical fiber preform processing apparatus 30 includes a support portion 31, a partition member 32, an oxyhydrogen burner 33, a first motor 34, a second motor 35, a support portion 36, a ball screw 37, and the like. It is roughly composed.

The support part 31 is provided so as to support the glass rod 10 so as to be rotatable about its axis 10a.
Further, the glass rod-like body 10 is rotated about the shaft 10 a by the first motor 34 while being supported by the support portion 31.

  The oxyhydrogen burner 33 is disposed so as to face the glass rod-shaped body 10 and is movable along the longitudinal direction of the glass rod-shaped body 10 by the second motor 35 via the ball screw 37. Yes.

  A cylindrical shielding member 32 having a through hole 32 a for inserting the glass rod 10 is provided behind the oxyhydrogen burner 33 in the traveling direction. The shielding member 32 includes a support portion 36 that extends from the outer periphery thereof and is attached to the oxyhydrogen burner 33. Thereby, the shielding member 32 is movable along the longitudinal direction of the glass rod 10 in synchronization with the moving speed of the oxyhydrogen burner 33.

  The size of the shielding member 32 is appropriately adjusted according to the size of the oxyhydrogen burner 33, the heat amount (temperature) of the flame blown out from the oxyhydrogen burner 33, and the like.

  The material of the shielding member 32 is not particularly limited as long as it is not deformed by the heat of the oxyhydrogen flame blown from the oxyhydrogen burner 33, and any material such as metal, glass, and ceramics can be used.

  According to the glass rod processing apparatus 30 of this embodiment, at the rear of the oxyhydrogen burner 33 in the traveling direction, it is synchronized with the oxyhydrogen burner 33 and surrounds at least a part of the outer periphery of the glass rod 10. Since the shielding member 32 is provided as described above, the glass particles scattered from the glass rod-like body 10 due to the heating of the oxyhydrogen burner 33 are reattached to the surface of the glass rod-like body 10, thereby causing the cloudiness generated in the glass rod-like body 10. Can be suppressed.

  In this embodiment, the cylindrical shielding member 32 is exemplified as the fog suppression means for suppressing the fog generated in the glass rod 10 by reattaching to the surface of the glass rod 10, but the glass of the present invention is exemplified. The rod-shaped body processing apparatus is not limited to this. In the glass rod-shaped body processing apparatus of the present invention, the glass fine particles generated by disassembling a part of the glass rod-shaped body are not heated by the oxyhydrogen flame blown from the oxyhydrogen burner on the surface of the glass rod-shaped body. Any shape fogging suppression means can be applied as long as it has a shape that can be prevented from scattering and adhering to the portion.

  Moreover, in this embodiment, although the one shielding member 32 provided in the back of the advancing direction of the oxyhydrogen burner 33 was illustrated as a fog suppression means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the processing apparatus for a glass rod-like body of the present invention, it is sufficient that the fogging suppression means is provided at least behind the traveling direction of the oxyhydrogen burner. Therefore, the fog suppression means may be provided in front of the traveling direction of the oxyhydrogen burner.

  Moreover, in this embodiment, although the oxyhydrogen burner 33 was illustrated as a heating means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the apparatus for processing a glass rod-like body of the present invention, a gas burner, a plasma flame or the like may be used as a heating means.

Next, with reference to FIG. 2, the processing method of the glass rod-shaped body using the processing apparatus of the glass rod-shaped body of this embodiment is demonstrated.
First, the shaft 10a of the glass rod-shaped body 10 manufactured by publicly known methods such as the VAD method is mounted on the support portion 31 of the processing apparatus 30 for the glass rod-shaped body.

  In this state, the oxyhydrogen burner 33 opposed to the glass rod 10 while rotating the glass rod 10 about the shaft 10 a by the first motor 34 is arranged along the longitudinal direction of the glass rod 10. It is moved and the glass rod-shaped body 10 is heated. In addition, the shielding member 32 provided integrally with the oxyhydrogen burner 33 and the support portion 36 and arranged behind the oxyhydrogen burner 33 in the traveling direction is synchronized with the moving speed of the oxyhydrogen burner 33, and the acid Following the hydrogen burner 33, the glass rod 10 is moved along the longitudinal direction. The shielding member 32 is moved by the power of the second motor 35 via the ball screw 37.

  By the way, in order to remove scratches and foreign matters on the surface of the glass rod-like body 10 by polishing the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 33, a unit in the longitudinal direction of the surface of the glass rod-like body 10 is used. In order to maintain the necessary polishing amount (g / mm) per length, heat must be sufficiently transferred to the inside of the glass rod 10 so as not to leave a large strain inside the glass rod 10. . In addition to this, it is necessary to prevent glass particles generated by heating with the oxyhydrogen burner 33 from reattaching to the surface of the glass rod 10.

  Therefore, in this embodiment, the shielding member 32 is placed behind the oxyhydrogen burner 33 so as to surround at least a part of the outer periphery of the glass rod 10 so as to be synchronized with the oxyhydrogen burner 33 in the rearward direction of the oxyhydrogen burner 33. By following the above, the surface of the glass rod-shaped body 10 is polished to remove scratches and foreign matter on the surface of the glass rod-shaped body 10, and the glass fine particles scattered from the glass rod-shaped body 10 by heating of the oxyhydrogen burner 33 are The adhesion to the surface of the glass rod 10 can be suppressed again. Further, the residual strain inside the glass rod-like body 10 is equivalent to that when polished by a conventional method and is not affected by the provision of the shielding member 32.

(Third embodiment)
3rd embodiment of the processing apparatus of the glass rod-shaped body which concerns on this invention is described.
FIG. 3 is a schematic view showing a third embodiment of the processing apparatus for glass rods according to the present invention.
In FIG. 3, reference numeral 10 denotes a glass rod-like body, 40 denotes a glass rod-like body processing device, 41 denotes a support portion, 42 denotes a shielding member, 43 denotes an oxyhydrogen burner, 44 denotes a first motor, 45 denotes a second motor, Reference numeral 46 denotes a support portion, and 47 denotes a ball screw.

  The optical fiber preform processing apparatus 40 includes a support portion 41, a partition member 42, an oxyhydrogen burner 43, a first motor 44, a second motor 45, a support portion 46, a ball screw 47, It is roughly composed.

The support portion 41 is provided so as to support the glass rod-shaped body 10 so as to be rotatable about its axis 10a.
Further, the glass rod-like body 10 is rotated around the shaft 10 a by the first motor 44 while being supported by the support portion 41.

  Further, the oxyhydrogen burner 43 is disposed so as to face the glass rod-shaped body 10 and is movable along the longitudinal direction of the glass rod-shaped body 10 by the second motor 45 via the ball screw 47. Yes.

  A cylindrical shielding member 42 having a through hole 42 a for inserting the glass rod 10 is provided behind the oxyhydrogen burner 43 in the traveling direction. The shielding member 42 includes a support portion 46 that extends from the outer periphery thereof and is attached to the oxyhydrogen burner 43. Thereby, the shielding member 42 is movable along the longitudinal direction of the glass rod 10 in synchronization with the moving speed of the oxyhydrogen burner 43. The shielding member 42 is formed by connecting cylindrical members 42 </ b> A, 42 </ b> B, 42 </ b> C, 42 </ b> D having different outer diameters, and is extendable along the longitudinal direction of the glass rod 10. Thereby, since the shielding member 42 covers all the portions of the glass rod-shaped body 10 that have been heated by the oxyhydrogen burner 43, the glass particles scattered from the glass rod-shaped body 10 due to the heating of the oxyhydrogen burner 43 are removed from the glass rod-shaped body 10. It can be completely prevented from re-adhering to the surface.

  The size of the shielding member 42 is appropriately adjusted according to the size of the oxyhydrogen burner 43, the amount of heat (temperature) of the flame blown out from the oxyhydrogen burner 43, and the like.

  The material of the shielding member 42 is not particularly limited as long as it is not deformed by the heat of the oxyhydrogen flame blown from the oxyhydrogen burner 43, and any material such as metal, glass, ceramics, etc. may be used.

  In this embodiment, the oxyhydrogen burner 43 is exemplified as the heating means, but the glass rod processing apparatus of the present invention is not limited to this. In the apparatus for processing a glass rod-like body of the present invention, a gas burner, a plasma flame or the like may be used as a heating means.

Next, with reference to FIG. 3, the processing method of the glass rod-shaped body using the glass rod-shaped processing apparatus of this embodiment is demonstrated.
First, the shaft 10a of the glass rod-like body 10 produced by publicly known methods such as the VAD method is mounted on the support portion 41 of the glass rod-like body processing apparatus 40.

  In this state, the oxyhydrogen burner 43 opposed to the glass rod 10 while rotating the glass rod 10 about the shaft 10 a by the first motor 44 along the longitudinal direction of the glass rod 10. It is moved and the glass rod-shaped body 10 is heated. Further, the shielding member 42 provided integrally with the oxyhydrogen burner 43 and the support portion 46 and disposed behind the oxyhydrogen burner 43 in the traveling direction is synchronized with the moving speed of the oxyhydrogen burner 43, and the acid It moves along the longitudinal direction of the glass rod 10 by following the hydrogen burner 43. The shielding member 42 extends with the movement of the oxyhydrogen burner 43 and covers all portions of the glass rod-like body 10 that have been heated by the oxyhydrogen burner 43. Further, the shielding member 42 is moved by the power of the second motor 45 via the ball screw 47.

  By the way, in order to remove scratches and foreign matter on the surface of the glass rod-like body 10 by polishing the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 43, a unit in the longitudinal direction of the surface of the glass rod-like body 10 is used. In order to maintain the necessary polishing amount (g / mm) per length, heat must be sufficiently transferred to the inside of the glass rod 10 so as not to leave a large strain inside the glass rod 10. . In addition to this, it is necessary to prevent glass particles generated by heating with the oxyhydrogen burner 33 from reattaching to the surface of the glass rod 10.

  Therefore, in this embodiment, the shielding member 42 covers all the portions of the glass rod-shaped body 10 that have been heated by the oxyhydrogen burner 43, and the surface of the glass rod-shaped body 10 is polished so that the surface of the glass rod-shaped body 10 is polished. While removing a flaw and a foreign material, it can suppress that the glass fine particle which disperses from the glass rod-shaped object 10 by the heating of the oxyhydrogen burner 43 adheres to the surface of the glass rod-shaped object 10 again. Further, the residual strain inside the glass rod-like body 10 is equivalent to that when polished by a conventional method and is not affected by the provision of the shielding member 42.

(Fourth embodiment)
A fourth embodiment of the processing apparatus for glass rods according to the present invention will be described.
FIG. 4 is a schematic diagram showing a fourth embodiment of the processing apparatus for glass rod-like bodies according to the present invention, and (b) is a schematic sectional view along a direction perpendicular to the longitudinal direction of the glass rod-like bodies shown in (a). FIG.
In FIG. 4, reference numeral 10 denotes a glass rod-like body, 50 denotes a glass rod-like body processing device, 51 denotes a support portion, 52 denotes a partition member, 53 denotes an oxyhydrogen burner, 54 denotes a first motor, 55 denotes a second motor, Reference numeral 56 denotes a support portion, 57 denotes a ball screw, and 58 denotes an exhaust port.

  The optical fiber preform processing apparatus 50 includes a support portion 51, a partition member 52, an oxyhydrogen burner 53, a first motor 54, a second motor 55, a support portion 56, a ball screw 57, and the like. , And an exhaust port 58.

The support portion 51 is provided so as to support the glass rod-like body 10 so as to be rotatable about its axis 10a.
Further, the glass rod-like body 10 is rotated around the shaft 10 a by the first motor 54 while being supported by the support portion 51.

  The oxyhydrogen burner 53 is disposed so as to face the glass rod-shaped body 10 and is movable along the longitudinal direction of the glass rod-shaped body 10 by the second motor 55 via the ball screw 57. Yes.

  Behind the traveling direction of the oxyhydrogen burner 53, a semi-disc-shaped partition member 52 is provided that partitions the portion heated by the oxyhydrogen burner 53 of the glass rod-shaped body 10 and at least a part of the other portions. Yes. The partition member 52 includes a support portion 56 that extends from the outer periphery thereof and is attached to the oxyhydrogen burner 53. Thereby, the partition member 52 is movable along the longitudinal direction of the glass rod 10 in synchronization with the moving speed of the oxyhydrogen burner 53.

  The size of the partition member 52 is appropriately adjusted according to the size of the oxyhydrogen burner 53, the amount of heat (temperature) of the flame blown out from the oxyhydrogen burner 53, and the like.

  The material of the partition member 52 is not particularly limited as long as it is not deformed by the heat of the oxyhydrogen flame blown out from the oxyhydrogen burner 53, and any material such as metal, glass, and ceramics can be used.

  Furthermore, an exhaust port 58 for sucking glass particles scattered from the glass rod 10 by heating the oxyhydrogen burner 53 is arranged so as to face the oxyhydrogen burner 53 with the glass rod 10 interposed therebetween.

  According to the glass rod-shaped processing apparatus 50 of this embodiment, at least a part of the outer periphery of the glass rod-shaped body 10 is enclosed behind the oxyhydrogen burner 53 in the traveling direction so as to synchronize with the oxyhydrogen burner 53. Since the partition member 52 is provided and the exhaust port 58 is disposed at a position facing the oxyhydrogen burner 53 across the glass rod 10, the glass rod 10 is heated by the oxyhydrogen burner 53. When the scattered glass particles are reattached to the surface of the glass rod-like body 10, fogging generated in the glass rod-like body 10 can be suppressed.

  In this embodiment, the semi-disc-shaped partition member 52 is exemplified as the fogging suppressing means for suppressing the fogging generated in the glass rod 10 by reattaching to the surface of the glass rod 10. The glass rod processing apparatus is not limited to this. In the glass rod-shaped body processing apparatus of the present invention, the glass fine particles generated by disassembling a part of the glass rod-shaped body are not heated by the oxyhydrogen flame blown from the oxyhydrogen burner on the surface of the glass rod-shaped body. Any shape fogging suppression means can be applied as long as it has a shape that can be prevented from scattering and adhering to the portion.

  Moreover, in this embodiment, although the one partition member 52 provided in the back of the advancing direction of the oxyhydrogen burner 53 was illustrated as a fogging suppression means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the processing apparatus for a glass rod-like body of the present invention, it is sufficient that the fogging suppression means is provided at least behind the traveling direction of the oxyhydrogen burner. Therefore, the fog suppression means may be provided in front of the traveling direction of the oxyhydrogen burner.

  Moreover, in this embodiment, although the oxyhydrogen burner 53 was illustrated as a heating means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the apparatus for processing a glass rod-like body of the present invention, a gas burner, a plasma flame or the like may be used as a heating means.

Next, with reference to FIG. 4, the processing method of the glass rod-shaped body using the glass rod-shaped processing apparatus of this embodiment is demonstrated.
First, the shaft 10a of the glass rod-shaped body 10 manufactured by publicly known methods such as the VAD method is mounted on the support portion 51 of the glass rod-shaped processing apparatus 50.

  In this state, the oxyhydrogen burner 53 opposed to the glass rod 10 while rotating the glass rod 10 about the shaft 10 a by the first motor 54 along the longitudinal direction of the glass rod 10. It is moved and the glass rod-shaped body 10 is heated. Further, the partition member 52 provided integrally with the oxyhydrogen burner 53 and the support portion 56 and disposed behind the oxyhydrogen burner 53 in the traveling direction is synchronized with the moving speed of the oxyhydrogen burner 53, and the acid Following the hydrogen burner 53, the glass rod 10 is moved along the longitudinal direction. The partition member 52 is moved by the power of the second motor 55 via the ball screw 57. Further, while the glass rod-shaped body 10 is heated by the oxyhydrogen burner 53, the suction of the glass particles scattered from the glass rod-shaped body 10 by the heating of the oxyhydrogen burner 53 is continued by the exhaust port 58.

  By the way, in order to remove scratches and foreign matter on the surface of the glass rod-like body 10 by polishing the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 53, a unit in the longitudinal direction of the surface of the glass rod-like body 10 is used. In order to maintain the necessary polishing amount (g / mm) per length, heat must be sufficiently transferred to the inside of the glass rod 10 so as not to leave a large strain inside the glass rod 10. . In addition to this, it is necessary to prevent glass fine particles generated by heating with the oxyhydrogen burner 53 from reattaching to the surface of the glass rod-like body 10.

  Therefore, in this embodiment, the partition member 52 partitions the portion heated by the oxyhydrogen burner 53 of the glass rod-shaped body 10 and at least a portion of the other portion, and polishes the surface of the glass rod-shaped body 10. Then, the surface of the glass rod-shaped body 10 is removed from scratches and foreign matter, and the glass fine particles scattered from the glass rod-shaped body 10 due to the heating of the oxyhydrogen burner 53 are prevented from adhering to the surface of the glass rod-shaped body 10 again. be able to. Further, the residual strain inside the glass rod-like body 10 is equivalent to that when polished by a conventional method, and is not affected by the provision of the partition member 52.

(Fifth embodiment)
5th Embodiment of the processing apparatus of the glass rod-shaped body which concerns on this invention is described.
FIG. 5 is a schematic diagram showing a fifth embodiment of the glass rod-shaped body processing apparatus according to the present invention, and (b) is a schematic cross-sectional view along a direction perpendicular to the longitudinal direction of the glass rod-shaped body shown in (a). FIG.
In FIG. 5, reference numeral 10 denotes a glass rod-like body, 60 denotes a glass rod-like body processing device, 61 denotes a support portion, 62 denotes a shielding member, 63 denotes an oxyhydrogen burner, 64 denotes a first motor, 65 denotes a second motor, Reference numeral 66 denotes a support portion, 67 denotes a ball screw, and 68 denotes an exhaust port.

  This optical fiber preform processing apparatus 60 includes a support portion 61, a shielding member 62, an oxyhydrogen burner 63, a first motor 64, a second motor 65, a support portion 66, and a ball screw 67. , And an exhaust port 68.

The support portion 61 is provided so as to support the glass rod-like body 10 so as to be rotatable about its axis 10a.
Further, the glass rod-like body 10 is rotated around the shaft 10 a by the first motor 64 while being supported by the support portion 61.

  Further, the oxyhydrogen burner 63 is disposed so as to face the glass rod-shaped body 10, and is movable along the longitudinal direction of the glass rod-shaped body 10 by the second motor 65 via the ball screw 67. Yes.

  Behind the traveling direction of the oxyhydrogen burner 63 is provided a semi-cylindrical shielding member 62 that partitions the portion heated by the oxyhydrogen burner 63 of the glass rod 10 and at least a part of the other portion. Yes. The shielding member 62 includes a support portion 66 that extends from the outer periphery thereof and is attached to the oxyhydrogen burner 63. Thereby, the shielding member 62 is movable along the longitudinal direction of the glass rod 10 in synchronization with the moving speed of the oxyhydrogen burner 63.

  The size of the shielding member 62 is appropriately adjusted according to the size of the oxyhydrogen burner 63, the amount of heat (temperature) of the flame blown out from the oxyhydrogen burner 63, and the like.

  The material of the shielding member 62 is not particularly limited as long as it is not deformed by the heat of the oxyhydrogen flame blown from the oxyhydrogen burner 63, and any material such as metal, glass, ceramics, etc. may be used.

  Further, an exhaust port 68 for sucking glass particles scattered from the glass rod 10 by heating the oxyhydrogen burner 63 is arranged so as to face the oxyhydrogen burner 63 with the glass rod 10 interposed therebetween.

  According to the glass rod-shaped processing apparatus 60 of this embodiment, at least a part of the outer periphery of the glass rod-shaped body 10 is enclosed behind the oxyhydrogen burner 63 in the traveling direction so as to synchronize with the oxyhydrogen burner 63. As described above, since the shielding member 62 is provided and the exhaust port 68 is disposed at a position facing the oxyhydrogen burner 63 with the glass rod 10 interposed therebetween, the oxyhydrogen burner 63 is heated to remove the glass rod 10 from the glass rod 10. When the scattered glass particles are reattached to the surface of the glass rod-like body 10, fogging generated in the glass rod-like body 10 can be suppressed.

  In this embodiment, the semi-cylindrical shielding member 62 is exemplified as the fog suppression means for suppressing the fogging generated in the glass rod 10 by reattaching to the surface of the glass rod 10. The glass rod processing apparatus is not limited to this. In the glass rod-shaped body processing apparatus of the present invention, the glass fine particles generated by disassembling a part of the glass rod-shaped body are not heated by the oxyhydrogen flame blown from the oxyhydrogen burner on the surface of the glass rod-shaped body. Any shape fogging suppression means can be applied as long as it has a shape that can be prevented from scattering and adhering to the portion.

  Moreover, in this embodiment, although the one shielding member 62 provided in the back of the advancing direction of the oxyhydrogen burner 63 was illustrated as a fog suppression means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the processing apparatus for a glass rod-like body of the present invention, it is sufficient that the fogging suppression means is provided at least behind the traveling direction of the oxyhydrogen burner. Therefore, the fog suppression means may be provided in front of the traveling direction of the oxyhydrogen burner.

  Moreover, in this embodiment, although the oxyhydrogen burner 63 was illustrated as a heating means, the processing apparatus of the glass rod-shaped body of this invention is not limited to this. In the apparatus for processing a glass rod-like body of the present invention, a gas burner, a plasma flame or the like may be used as a heating means.

Next, with reference to FIG. 5, the processing method of the glass rod-shaped body using the processing apparatus of the glass rod-shaped body of this embodiment is demonstrated.
First, the shaft 10a of the glass rod 10 produced by publicly known methods such as the VAD method is mounted on the support 61 of the glass rod processing apparatus 60.

  In this state, the oxyhydrogen burner 53 opposed to the glass rod 10 while rotating the glass rod 10 about the shaft 10 a by the first motor 64 along the longitudinal direction of the glass rod 10. It is moved and the glass rod-shaped body 10 is heated. Further, the shielding member 62 provided integrally with the oxyhydrogen burner 63 and the support portion 66 and disposed behind the oxyhydrogen burner 53 in the traveling direction is synchronized with the moving speed of the oxyhydrogen burner 63, and the acid It moves along the longitudinal direction of the glass rod 10 by following the hydrogen burner 63. The partition member 62 is moved by the power of the second motor 65 via the ball screw 67. Further, while the glass rod-shaped body 10 is heated by the oxyhydrogen burner 63, the suction of the glass particles scattered from the glass rod-shaped body 10 by the heating of the oxyhydrogen burner 63 is continued by the exhaust port 68.

  By the way, in order to remove scratches and foreign matters on the surface of the glass rod-like body 10 by polishing the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 63, a unit in the longitudinal direction of the surface of the glass rod-like body 10 is used. In order to maintain the necessary polishing amount (g / mm) per length, heat must be sufficiently transferred to the inside of the glass rod 10 so as not to leave a large strain inside the glass rod 10. . In addition to this, it is necessary to prevent glass particles generated by heating by the oxyhydrogen burner 63 from adhering again to the surface of the glass rod 10.

  Therefore, in this embodiment, the surface of the glass rod-shaped body 10 is polished by partitioning the portion heated by the oxyhydrogen burner 63 of the glass rod-shaped body 10 and at least a part of the other portion by the shielding member 62. Then, scratches and foreign matters on the surface of the glass rod-shaped body 10 are removed, and glass fine particles scattered from the glass rod-shaped body 10 due to heating of the oxyhydrogen burner 63 are prevented from adhering to the surface of the glass rod-shaped body 10 again. be able to. Further, the residual strain inside the glass rod-like body 10 is equivalent to that when polished by a conventional method and is not affected by the provision of the shielding member 62.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.

Example 1
A glass rod with an outer diameter of 80 mm prepared by the VAD method was prepared.
The surface of the glass rod 10 was polished by the glass rod processing apparatus 20 as shown in FIG.
In polishing the surface of the glass rod-shaped body 10, the partition member 22 surrounding at least a part of the outer periphery of the glass rod-shaped body 10 is arranged behind the oxyhydrogen burner 23 so as to synchronize with the oxyhydrogen burner 23. 23.
The amount of heat of the oxyhydrogen flame blown from the oxyhydrogen burner 23 was adjusted so that the polishing amount G per unit length in the longitudinal direction of the surface of the glass rod-shaped body 10 by heating the oxyhydrogen burner 23 was 0.17 g / mm. .
As a result, in this example, the glass fine particles generated by polishing the surface of the glass rod-shaped body 10 adhered to the inner side (burner side) of the partition member 22, and the surface of the glass rod-shaped body 10 was not fogged at all. Further, the residual strain inside the glass rod-like body 10 was the same as the conventional one, and there was no influence due to the installation of the partition member 22.
In addition, the residual distortion inside the glass rod-shaped body 10 was inspected by the crossed Nicols method. However, the inspection method of the residual distortion inside the glass rod-shaped body 10 is not limited to this. As a method for inspecting the residual strain inside the glass rod-like body 10, inspection methods such as a parallel Nicol method, a circular polarization method, and a senalmon method can also be used.

(Example 2)
A glass rod with an outer diameter of 80 mm prepared by the VAD method was prepared.
The surface of the glass rod 10 was polished by the glass rod processing apparatus 30 as shown in FIG.
In polishing the surface of the glass rod 10, the shielding member 32 that surrounds at least a part of the outer periphery of the glass rod 10 is provided behind the oxyhydrogen burner 33 so as to synchronize with the oxyhydrogen burner 33. 33.
The amount of heat of the oxyhydrogen flame blown from the oxyhydrogen burner 33 was adjusted so that the polishing amount G per unit length in the longitudinal direction of the surface of the glass rod-shaped body 10 by heating the oxyhydrogen burner 33 was 0.17 g / mm. .
As a result, in this example, the glass fine particles generated by the polishing of the surface of the glass rod-shaped body 10 adhered to the surface of the shielding member 32, and the surface of the glass rod-shaped body 10 was not fogged at all. Further, the residual strain inside the glass rod-like body 10 was the same as the conventional one, and there was no influence due to the installation of the shielding member 32.

(Example 3)
A glass rod with an outer diameter of 80 mm prepared by the VAD method was prepared.
The surface of the glass rod-shaped body 10 was polished by the glass rod-shaped processing apparatus 50 as shown in FIG.
In polishing the surface of the glass rod 10, the portion heated by the oxyhydrogen burner 53 of the glass rod 10 so as to synchronize with the oxyhydrogen burner 53 behind the oxyhydrogen burner 53 in the traveling direction, A partition member 52 for partitioning at least a part from the portion was provided, and the partition member 52 was made to follow the oxyhydrogen burner 53. Further, while the glass rod-shaped body 10 was heated by the oxyhydrogen burner 53, the suction of glass fine particles scattered from the glass rod-shaped body 10 by the heating of the oxyhydrogen burner 53 was continued by the exhaust port 58.
The amount of heat of the oxyhydrogen flame blown out from the oxyhydrogen burner 53 was adjusted so that the polishing amount G per unit length in the longitudinal direction of the surface of the glass rod-shaped body 10 due to the heating of the oxyhydrogen burner 53 was 0.17 g / mm. .

In the present embodiment, the distance between the oxyhydrogen burner 53 and the partition member 52 was kept at 90 mm in the polishing of the surface of the glass rod-shaped body 10 by the oxyhydrogen burner 53. On the other hand, the gap between the glass rod 10 and the partition member 52 was changed in the range of 3 mm to 35 mm.
As a result, when the gap was less than 5 mm, glass fine particles generated by heating with the oxyhydrogen burner 53 adhered to the glass rod 10. Such a phenomenon is caused by the fact that the glass particles adhering to the surface of the partition member 52 are beaten and scattered again, and adhere to the surface of the glass rod 10. Moreover, the glass rod-shaped body 10 was made to contact the partition member 52 at the time of work, and the surface of the glass rod-shaped body 10 was damaged.
On the other hand, when the gap exceeded 30 mm, the surface of the glass rod-shaped body 10 was not damaged, but the glass particles adhered to the surface of the glass rod-shaped body 10. Such a phenomenon is caused by the fact that the gap between the glass rod-like body 10 and the partition member 52 is too wide and the glass fine particles pass through this gap.
Further, when the gap was 5 mm or more and 30 mm or less, all the glass particles adhered to the surface of the partition member 52 on the oxyhydrogen burner 53 side, and no fogging occurred on the surface of the glass rod 10.
In addition, the residual strain inside the glass rod-shaped body 10 was similar to that of the prior art.

Next, in the polishing of the surface of the glass rod 10 by the oxyhydrogen burner 53, the gap between the glass rod 10 and the partition member 52 was kept at 10 mm. On the other hand, the distance between the oxyhydrogen burner 53 and the partition member 52 was changed in the range of 60 mm to 120 mm.
As a result, when the distance is less than 70 mm, the glass fine particles generated by heating with the oxyhydrogen burner 53 did not adhere to the glass rod-like body 10, but the glass fine particles attached to the partition member 52 were not heated by the flame of the oxyhydrogen burner 53. Has solidified.
On the other hand, when the distance exceeded 100 mm, the glass particles adhered to the surface of the glass rod-like body 10 closer to the oxyhydrogen burner 53 than the partition member 52.
When the distance was 70 mm or more and 100 mm or less, all the glass fine particles adhered to the surface of the partition member 52 on the oxyhydrogen burner 53 side, and no fogging occurred on the surface of the glass rod 10. Furthermore, since the glass particles adhering to the surface of the partition member 52 did not solidify, the partition member 52 could be used repeatedly.
In addition, the residual strain inside the glass rod-shaped body 10 was similar to that of the prior art.

Example 4
A glass rod with an outer diameter of 80 mm prepared by the VAD method was prepared.
The surface of the glass rod 10 was polished by the glass rod processing apparatus 60 as shown in FIG.
In polishing the surface of the glass rod 10, the portion heated by the oxyhydrogen burner 63 of the glass rod 10 so as to be synchronized with the oxyhydrogen burner 63 behind the oxyhydrogen burner 63 in the traveling direction, A shielding member 62 for partitioning at least part of the portion was provided, and the shielding member 62 was caused to follow the oxyhydrogen burner 63. Further, while the glass rod-shaped body 10 was heated by the oxyhydrogen burner 63, the suction of the glass particles scattered from the glass rod-shaped body 10 by the heating of the oxyhydrogen burner 63 was continued by the exhaust port 68.
The amount of heat of the oxyhydrogen flame blown from the oxyhydrogen burner 63 was adjusted so that the polishing amount G per unit length in the longitudinal direction of the surface of the glass rod-like body 10 by heating the oxyhydrogen burner 63 was 0.17 g / mm. .

In the present embodiment, the distance between the oxyhydrogen burner 63 and the shielding member 62 was kept at 90 mm in the polishing of the surface of the glass rod-shaped body 10 by the oxyhydrogen burner 63. On the other hand, the gap between the glass rod 10 and the shielding member 62 was changed in the range of 3 mm to 35 mm.
As a result, when the gap was less than 5 mm, glass particles generated by heating with the oxyhydrogen burner 63 adhered to the glass rod 10. Such a phenomenon is caused by the fact that the glass particles adhering to the surface of the shielding member 62 are beaten and scattered again, and adhere to the surface of the glass rod 10. Moreover, the glass rod-shaped body 10 was made to contact the shielding member 62 at the time of work, and the surface of the glass rod-shaped body 10 was damaged.
On the other hand, when the gap exceeded 30 mm, the surface of the glass rod-shaped body 10 was not damaged, but the glass particles adhered to the surface of the glass rod-shaped body 10. Such a phenomenon is caused by the fact that the gap between the glass rod 10 and the shielding member 62 is too wide, and the glass particles pass through this gap.
When the gap was 5 mm or more and 30 mm or less, all the glass particles adhered to the surface of the shielding member 62 on the oxyhydrogen burner 63 side, and no fogging occurred on the surface of the glass rod 10.
In addition, the residual strain inside the glass rod-shaped body 10 was similar to that of the prior art.

Next, in the polishing of the surface of the glass rod 10 by the oxyhydrogen burner 63, the gap between the glass rod 10 and the shielding member 62 was kept at 10 mm. On the other hand, the distance between the oxyhydrogen burner 63 and the shielding member 62 was changed in the range of 60 mm to 120 mm.
As a result, when the distance is less than 70 mm, the glass fine particles generated by the heating by the oxyhydrogen burner 63 did not adhere to the glass rod 10, but the glass fine particles adhering to the shielding member 62 did not heat the flame of the oxyhydrogen burner 63. Has solidified.
On the other hand, when the distance exceeded 100 mm, the glass fine particles adhered to the surface of the glass rod-like body 10 closer to the oxyhydrogen burner 63 than the shielding member 62.
When the distance was 70 mm or more and 100 mm or less, all the glass particles adhered to the surface of the shielding member 62 on the oxyhydrogen burner 63 side, and no fogging occurred on the surface of the glass rod 10. Furthermore, since the glass particles adhering to the surface of the shielding member 62 did not solidify, the shielding member 62 could be used repeatedly.
In addition, the residual strain inside the glass rod-shaped body 10 was similar to that of the prior art.

(Comparative example)
A glass rod with an outer diameter of 80 mm prepared by the VAD method was prepared.
The surface of the glass rod-shaped body 100 was flame-polished by the optical fiber preform processing apparatus 110 as shown in FIG.
In polishing the surface of the glass rod-shaped body 100, a portion of the surface of the glass rod-shaped body 100 that is not heated by the oxyhydrogen burner 113 is not covered with a shielding member or the like, and the surface of the glass rod-shaped body 100 is covered with the oxyhydrogen burner 113. The heated portion and its vicinity and the portion not heated by the oxyhydrogen burner 113 were not partitioned by a partition member or the like.
The amount of heat of the oxyhydrogen flame blown from the oxyhydrogen burner 113 was adjusted so that the polishing amount G per unit length in the longitudinal direction of the surface of the glass rod-shaped body 100 by heating the oxyhydrogen burner 113 was 0.17 g / mm. .
As a result, in this comparative example, glass fine particles adhered to the surface of the glass rod-shaped body, and the surface of the glass rod-shaped body was clouded white.

The processing apparatus and processing method for glass rods of the present invention are not limited to single-mode fibers, dispersion-shifted fibers, cut-off shift fibers, dispersion-compensating fibers, and optical fiber preforms used in the production of any type of optical fiber It can also be applied to processing.
In addition, the processing apparatus and processing method of the glass rod-shaped body of the present invention include a vapor phase axis method (VAD method), an external method (OVD method), an internal method (CVD method, MCVD method, PCVD method), or It can also be applied to all optical fiber preform processing methods such as the rod-in-tube method.

It is a schematic diagram which shows 1st embodiment of the processing apparatus of the optical fiber preform which concerns on this invention. It is a schematic diagram which shows 2nd embodiment of the processing apparatus of the preform | base_material for optical fibers which concerns on this invention. It is a schematic diagram which shows 3rd embodiment of the processing apparatus of the preform | base_material for optical fibers which concerns on this invention. It is a schematic diagram which shows 4th embodiment of the base material processing apparatus for optical fibers which concerns on this invention. It is a schematic diagram which shows 5th embodiment of the processing apparatus of the optical fiber preform which concerns on this invention. It is a schematic diagram which shows the processing apparatus of the conventional optical fiber preform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Glass rod-shaped body 20, 20, 40, 50, 60 ... Optical fiber preform processing apparatus 21, 31, 41, 51, 61 ... Bearing part, 22, 52 ... Partition member, 23, 33, 43, 53, 63 ... oxyhydrogen burner, 24, 34, 44, 54, 64 ... first motor, 25, 35, 45, 55, 65 ... second Motor, 26, 36, 46, 56, 66 ... support part, 27, 37, 47, 57 ... ball screw, 32, 42, 62 ... shielding member, 58, 68 ... exhaust port.

Claims (9)

A supporting means for rotatably supporting the glass rod around its axis, a heating means facing the glass rod and movable along the longitudinal direction thereof, and being moved in synchronization with the heating means A clouding suppression unit that suppresses fogging due to reattachment of the glass particles scattered from the glass rod-like body to the glass rod-like surface by heating of the heating means disposed at least behind the traveling direction;
The fogging suppression means is a shielding member formed by connecting a plurality of cylindrical members having different outer diameters having through holes for inserting the glass rod-like body, and the shielding member is arranged in the longitudinal direction of the glass rod-like body. It is stretchable along,
The shielding member includes a support portion that extends from an outer periphery of the shielding member and is attached to the heating means, and is movable along a longitudinal direction of the glass rod-like body together with the heating means. Processing equipment. A supporting means for rotatably supporting the glass rod around its axis, a heating means facing the glass rod and movable along the longitudinal direction thereof, and being moved in synchronization with the heating means The glass rod-like body sandwiched between the glass rod-like body, and at least the fogging means for suppressing fogging due to reattachment of the glass particles scattered from the glass rod-like body to the surface of the glass rod-like body by heating of the heating means arranged behind the traveling direction And an exhaust port for sucking the glass particles,
The clouding suppression means is a semi-disc-shaped partition member, and the partition member partitions the part heated by the heating means of the glass rod-like body and at least a part of the other part,
The partition member includes a support portion that extends from the outer periphery of the partition member and is attached to the heating means, and is movable along the longitudinal direction of the glass rod-like body together with the heating means. Processing equipment. A supporting means for rotatably supporting the glass rod around its axis, a heating means facing the glass rod and movable along the longitudinal direction thereof, and being moved in synchronization with the heating means The glass rod-like body sandwiched between the glass rod-like body, and at least the fogging means for suppressing fogging due to reattachment of the glass particles scattered from the glass rod-like body to the surface of the glass rod-like body by heating of the heating means arranged behind the traveling direction And an exhaust port for sucking the glass particles,
The fogging suppression means is a semi-cylindrical shielding member, and the shielding member partitions the part heated by the heating means of the glass rod-like body and at least a part of the other part,
The shielding member includes a support portion that extends from an outer periphery of the shielding member and is attached to the heating means, and is movable along a longitudinal direction of the glass rod-like body together with the heating means. Processing equipment.  The said glass rod-shaped body is a preform | base_material for optical fibers, The processing apparatus of the glass rod-shaped body of any one of Claim 1 thru | or 3 characterized by the above-mentioned.  The glass rod-shaped processing apparatus according to any one of claims 1 to 3, wherein the heating means is an oxyhydrogen burner.  The glass rod-shaped body processing apparatus according to any one of claims 1 to 3, wherein the processing of the glass rod-shaped body is surface polishing of the glass rod-shaped body by heating of the heating means.  While rotating the glass rod around its axis, the heating means opposed to the glass rod is moved along the longitudinal direction of the glass rod to heat the glass rod, and at least the progress of the heating means It consists of a shielding member formed by connecting a plurality of cylindrical members having different outer diameters, each having a through-hole for inserting the glass rod-shaped body, and extending and contracting along the longitudinal direction of the glass rod-shaped body. The free-fogging suppression means is synchronized with the moving speed of the heating means, followed by the heating means, extended along the longitudinal direction of the glass rod-like body, and by the heating means of the glass rod-like body By covering all the parts where the heating has been completed, clouding of the surface of the glass rod-like body due to redeposition of glass fine particles scattered from the glass rod-like body by heating of the heating means is prevented. Method for processing a glass rod-like body, characterized in that the win. While rotating the glass rod around its axis, the heating means opposed to the glass rod is moved along the longitudinal direction of the glass rod to heat the glass rod, and at least the progress of the heating means Movement of the heating means is a fogging suppression means comprising a semi-disc-like partitioning member that is arranged rearward in the direction and that partitions a portion heated by the heating means of the glass rod-like body and at least a part of the other part. Glass particles that are synchronized with the speed, follow the heating means, and are scattered from the glass rod-like body by heating of the heating means by an exhaust port disposed so as to face the heating means with the glass rod-like body interposed therebetween. by sucking the machining direction of the glass rod-like body, characterized in that to suppress the fogging of the glass rod-shaped body surface by redeposition of the front Kiga Las microparticles . While rotating the glass rod around its axis, the heating means opposed to the glass rod is moved along the longitudinal direction of the glass rod to heat the glass rod, and at least the progress of the heating means Movement of the heating means is a fogging suppression means comprising a semi-cylindrical shielding member that is disposed rearward in the direction and separates at least a part of the part heated by the heating means of the glass rod-like body. Glass particles that are synchronized with the speed, follow the heating means, and are scattered from the glass rod-like body by heating of the heating means by an exhaust port disposed so as to face the heating means with the glass rod-like body interposed therebetween. by sucking the machining direction of the glass rod-like body, characterized in that to suppress the fogging of the glass rod-shaped body surface by redeposition of the front Kiga Las microparticles .

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