JP5830968B2 - Manufacturing method of glass base material - Google Patents

Manufacturing method of glass base material Download PDF

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JP5830968B2
JP5830968B2 JP2011143954A JP2011143954A JP5830968B2 JP 5830968 B2 JP5830968 B2 JP 5830968B2 JP 2011143954 A JP2011143954 A JP 2011143954A JP 2011143954 A JP2011143954 A JP 2011143954A JP 5830968 B2 JP5830968 B2 JP 5830968B2
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glass
gripping
rod
dummy
base material
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JP2013010659A (en
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川崎　希一郎
希一郎 川崎
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Sumitomo Electric Industries Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/60—Relationship between burner and deposit, e.g. position
    • C03B2207/64—Angle

Description

本発明は、バーナで生成したガラス微粒子を堆積させてガラス微粒子堆積体を形成する工程を含むガラス母材の製造方法に関する。   The present invention relates to a glass base material manufacturing method including a step of depositing glass fine particles generated by a burner to form a glass fine particle deposit.

バーナからガラス原料ガス及び燃焼ガスを含むガスを噴き出し、ガラス微粒子を生成して、ガラス微粒子を出発材に堆積させてガラス微粒子堆積体を製造する方法が知られている。例えば、石英系ガラスロッドの両端部にそれぞれ円柱状あるいは円筒状のダミー棒を予め溶着接続し、該ダミー棒の両側端部にはガラス微粒子を堆積せずに残し、且つ該ダミー棒の中程からは外径をテーパ状に且つ該石英ロッド外周には外径一定にガラス微粒子堆積体を形成してガラスロッド・ガラス微粒子堆積体複合体を合成する技術が知られている（例えば、特許文献１参照）。   A method is known in which a gas containing glass raw material gas and combustion gas is ejected from a burner, glass fine particles are generated, and the glass fine particles are deposited on a starting material to produce a glass fine particle deposit. For example, a cylindrical or cylindrical dummy rod is welded and connected in advance to both ends of a quartz glass rod, glass fine particles are left on both ends of the dummy rod, and the middle of the dummy rod Is known to synthesize a glass rod / glass fine particle composite by forming a glass fine particle deposit with a constant outer diameter on the outer periphery of the quartz rod (see, for example, Patent Documents). 1).

特開平６−２４７８４号公報JP-A-6-24784

ところで、ガラス微粒子堆積体を製造する際に用いられるダミー棒は、一般的にその一端に把持部を有しており、この把持部はガラス微粒子の堆積時やガラス微粒子堆積体の搬送時に、製造装置や搬送装置の把持機構によって把持される。特許文献１では、ダミー棒における把持部と堆積される部分とが接続される点が明確になっていないが、この把持部を含むダミー棒は、把持機構が把持可能なように複雑な形状に加工された高価なものである。そのため、ガラス微粒子堆積体を製造した後、透明化または透明化後に線引きすること等により把持機構で把持部を把持する必要が無くなった際、製品としては不要となるダミー棒をそのまま廃棄すると、ガラス微粒子堆積体の製造コストが嵩張り、不経済であった。   By the way, the dummy rod used for manufacturing the glass particulate deposit generally has a gripping portion at one end thereof, and this gripping portion is manufactured during the deposition of the glass particulate or the transport of the glass particulate deposit. It is gripped by the gripping mechanism of the device or the transport device. In Patent Document 1, it is not clear that the grip portion of the dummy bar is connected to the deposited portion, but the dummy rod including the grip portion has a complicated shape so that the grip mechanism can be gripped. It is processed and expensive. Therefore, after manufacturing the glass particulate deposit, it is not necessary to grip the gripping part with the gripping mechanism by making it transparent or drawing after transparentization. The production cost of the particulate deposit was bulky and uneconomical.

本発明の目的は、製造コストを抑えてガラス微粒子堆積体を製造することが可能なガラス母材の製造方法を提供することにある。   The objective of this invention is providing the manufacturing method of the glass base material which can suppress a manufacturing cost and can manufacture a glass particulate deposit body.

上記課題を解決することのできる本発明のガラス母材の製造方法は、把持機構に支持したターゲットへバーナで生成されるガラス微粒子を吹き付けて堆積させるガラス微粒子堆積体製造工程を含むガラス母材の製造方法であって、
前記ガラス微粒子堆積体製造工程では、
前記把持機構に把持される把持棒部に前記ターゲットとなる種棒部を一体的に接合してダミー棒とし、
前記ダミー棒の前記把持棒部を前記把持機構に把持させ、
前記バーナの前記把持棒部側の端部を通る前記バーナの軸線と平行な延長線が、前記ダミー棒における前記把持棒部と前記種棒部との接合箇所よりも前記把持棒部側を通らないようにしながら、前記バーナで生成されるガラス微粒子を前記ターゲットへ吹き付けることを特徴とする。 The glass base material manufacturing method of the present invention capable of solving the above-mentioned problems is a glass base material manufacturing process including a glass microparticle depositing body manufacturing step of spraying and depositing glass microparticles generated by a burner onto a target supported by a gripping mechanism. A manufacturing method comprising:
In the glass fine particle deposit manufacturing process,
A seed bar part serving as the target is integrally joined to a gripping bar part gripped by the gripping mechanism to form a dummy bar,
Causing the gripping mechanism to grip the gripping bar portion of the dummy bar,
An extension line parallel to the axis of the burner passing through the end of the burner on the side of the gripping bar passes through the gripping bar part side of the dummy bar rather than the joint between the gripping bar part and the seed bar part. The glass particles generated by the burner are sprayed onto the target while avoiding the above.

本発明のガラス母材の製造方法において、前記ガラス微粒子堆積体製造工程では、
ガラスロッドの両端に前記ダミー棒を一体的に接合し、
前記両端側にそれぞれ配置された前記把持機構に、前記ダミー棒の前記把持棒部をそれぞれ把持させることにより前記ガラスロッドを支持させ、
前記ガラスロッドと前記種棒部とからなるターゲットに対して前記バーナで生成されるガラス微粒子を吹き付けてもよい。 In the glass base material manufacturing method of the present invention, in the glass fine particle deposit manufacturing process,
The dummy rod is integrally joined to both ends of the glass rod,
The glass rods are supported by causing the gripping mechanisms respectively disposed on both end sides to grip the gripping bar portions of the dummy bars,
You may spray the glass fine particle produced | generated with the said burner with respect to the target which consists of the said glass rod and the said seed rod part.

本発明のガラス母材の製造方法において、前記ガラス微粒子堆積体製造工程より後に、
前記ダミー棒の前記把持棒部に付着したガラス微粒子を除去してから、前記ガラス微粒子堆積体を焼結することが好ましい。 In the method for manufacturing a glass base material of the present invention, after the glass fine particle deposit manufacturing process,
It is preferable to sinter the glass particulate deposit after removing the glass particulates adhering to the grip rod portion of the dummy rod.

本発明のガラス母材の製造方法において、前記ガラス微粒子堆積体製造工程より後に、
前記把持棒部を前記ダミー棒から切り離し、切り離した把持棒部を再度ガラス微粒子堆積体製造用の把持棒部として使用することが好ましい。 In the method for manufacturing a glass base material of the present invention, after the glass fine particle deposit manufacturing process,
It is preferable that the gripping bar part is separated from the dummy bar, and the separated gripping bar part is used again as a gripping bar part for manufacturing a glass particulate deposit.

本発明によれば、ダミー棒における把持棒部へガラス微粒子が堆積されなくなる、もしくは容易に除去可能な少量の堆積量に抑えられるため、複雑な形状で高価な把持棒部を種棒部から切り離して再利用することができる。これにより、高価な把持棒部の購入費を削減できるため、ガラス微粒子堆積体の製造コストを低く抑制してガラス母材を製造することができる。   According to the present invention, glass particles are not deposited on the gripping rod portion of the dummy rod, or a small amount of deposition that can be easily removed is suppressed, so that the expensive gripping rod portion having a complicated shape is separated from the seed rod portion. Can be reused. Thereby, since the purchase cost of an expensive holding rod part can be reduced, the glass base material can be manufactured while suppressing the manufacturing cost of the glass fine particle deposit.

本発明に係るガラス母材の製造方法におけるガラス微粒子堆積体製造工程の一例を示すガラス微粒子堆積体の側面図である。It is a side view of the glass fine particle deposit | flour body which shows an example of the glass fine particle deposit body manufacturing process in the manufacturing method of the glass base material which concerns on this invention. ダミー棒に対するバーナの位置関係を示す側面図である。It is a side view which shows the positional relationship of the burner with respect to a dummy stick. ガラス微粒子堆積体製造工程の後における工程を示す図であって、（ａ）はガラス微粒子堆積体の側面図、（ｂ）は取り外された把持棒部の側面図である。It is a figure which shows the process after a glass fine particle deposit body manufacturing process, Comprising: (a) is a side view of a glass fine particle deposit body, (b) is a side view of the removal holding | grip bar | burr part. 実施形態に係るガラス微粒子堆積体製造工程の他の例を示すガラス微粒子堆積体の側面図である。It is a side view of the glass particle deposit body which shows the other example of the glass particle deposit body manufacturing process which concerns on embodiment. 図４に示した例における、ダミー棒に対するバーナの位置関係を示す図であって、（ａ）は上端側における側面図、（ｂ）は下端側における側面図である。It is a figure which shows the positional relationship of the burner with respect to the dummy bar in the example shown in FIG. 4, Comprising: (a) is a side view in an upper end side, (b) is a side view in a lower end side. 図４に示した例における、ガラス微粒子堆積体製造工程の後における工程を示す図であって、（ａ）はガラス微粒子堆積体の側面図、（ｂ）は取り外された把持棒部の側面図である。It is a figure which shows the process after the glass fine particle deposit body manufacturing process in the example shown in FIG. 4, Comprising: (a) is a side view of a glass fine particle deposit body, (b) is a side view of the holding | grip rod part removed. It is.

以下、本発明に係るガラス母材の製造方法の実施の形態の例を、図面を参照して説明する。
まず、ＶＡＤ（Vapor Phase Axial Deposition）法によって、例えば、光ファイバの母材となるガラス微粒子堆積体を製造するガラス微粒子堆積体製造工程について説明する。
図１に示すように、ＶＡＤ法では、ダミー棒１１を把持機構１２によって支持し、このダミー棒１１のターゲットへバーナ１３からガラス微粒子を吹き付け、ガラス微粒子堆積体１５を製造する。バーナ１３は、ガラス原料ガスと可燃性ガス及び助燃性ガスとを噴出し、火炎加水分解反応によって生成されるガラス微粒子をダミー棒１１へ吹き付ける。 Hereinafter, an example of an embodiment of a manufacturing method of a glass base material concerning the present invention is explained with reference to drawings.
First, a glass fine particle deposit manufacturing process for manufacturing, for example, a glass fine particle deposit that becomes a base material of an optical fiber by a VAD (Vapor Phase Axial Deposition) method will be described.
As shown in FIG. 1, in the VAD method, a dummy rod 11 is supported by a gripping mechanism 12, and glass fine particles are sprayed from a burner 13 to a target of the dummy rod 11 to manufacture a glass fine particle deposit 15. The burner 13 ejects glass raw material gas, combustible gas, and auxiliary combustible gas, and sprays glass fine particles generated by the flame hydrolysis reaction onto the dummy rod 11.

ダミー棒１１は、製造装置や搬送装置などの把持機構１２に把持される把持棒部２１と、ターゲットとなる種棒部２２とを有している。これらの把持棒部２１及び種棒部２２は、何れも石英ガラスから形成されており、把持棒部２１の下端部に、円柱状に形成された種棒部２２が溶着されて一体的に接合されている。把持棒部２１には、例えば上部にフランジ部２５が形成され、中間部に径方向へ貫通する支持孔２６が形成され、その下端部は種棒部２２との接合箇所へ向かって種棒部２２と同径となるようなテーパ形状となっている。   The dummy bar 11 includes a gripping bar portion 21 that is gripped by a gripping mechanism 12 such as a manufacturing apparatus or a transport apparatus, and a seed bar portion 22 that is a target. The grip rod portion 21 and the seed rod portion 22 are both made of quartz glass, and the seed rod portion 22 formed in a cylindrical shape is welded to the lower end portion of the grip rod portion 21 so as to be integrally joined. Has been. For example, a flange portion 25 is formed in the upper portion of the gripping rod portion 21, and a support hole 26 penetrating in the radial direction is formed in an intermediate portion, and a lower end portion thereof is a seed rod portion toward a joint portion with the seed rod portion 22. The taper shape has the same diameter as that of 22.

把持棒部２１を把持する把持機構１２は、軸回りに回転可能かつ上下方向へ昇降可能とされ、この把持機構１２は、把持棒部２１が挿入されて支持することが可能な筒状部を有している。   The gripping mechanism 12 for gripping the gripping bar portion 21 is rotatable about an axis and can be moved up and down, and the gripping mechanism 12 is a cylindrical portion into which the gripping bar portion 21 can be inserted and supported. Have.

ガラス微粒子堆積体１５を製造するには、まず、把持棒部２１に種棒部２２を溶着して接合させたダミー棒１１を用意する。   In order to manufacture the glass particulate deposit 15, first, the dummy rod 11 is prepared by welding the seed rod portion 22 to the holding rod portion 21 and joining them.

次に、このダミー棒１１を、製造装置の把持機構１２に支持させる。把持機構１２の筒状部には、例えば把持棒部２１の支持孔２６に相当する位置に孔があけられており、ここに支持ピンを挿し込むか、もしくは把持棒部２１に設けられた上部のフランジ部２５を把持機構１２に入り込ませる、などにより把持棒部２１を支持すればよい。また、支持ピンとフランジ部２５の両方で支持してもよい。   Next, the dummy bar 11 is supported by the gripping mechanism 12 of the manufacturing apparatus. The cylindrical portion of the gripping mechanism 12 has a hole, for example, at a position corresponding to the support hole 26 of the gripping bar portion 21, and a support pin is inserted therein or an upper portion provided on the gripping bar portion 21. The grip rod portion 21 may be supported by, for example, inserting the flange portion 25 into the grip mechanism 12. Moreover, you may support with both a support pin and the flange part 25. FIG.

その後、このダミー棒１１をターゲットとし、このダミー棒１１へ向かってバーナ１３からガラス原料ガスと可燃性ガス及び助燃性ガスとを噴出し、火炎加水分解反応によって生成されるガラス微粒子をダミー棒１１へ吹き付ける。そして、把持機構１２によってダミー棒１１を軸回りに回転させながら徐々に引き上げる。これにより、ダミー棒１１の軸方向にガラス微粒子が堆積されてガラス微粒子堆積体１５が形成される。   Thereafter, using this dummy rod 11 as a target, glass raw material gas, combustible gas and auxiliary combustion gas are ejected from the burner 13 toward the dummy rod 11, and the glass particles generated by the flame hydrolysis reaction are discharged to the dummy rod 11. Spray on. Then, the gripping mechanism 12 gradually pulls up the dummy bar 11 while rotating it around the axis. As a result, glass particulates are deposited in the axial direction of the dummy rod 11 to form a glass particulate deposit 15.

このとき、図２に示すように、バーナ１３における把持棒部２１側の端部Ａを通るバーナ１３の軸線Ｘと平行な延長線Ｂが、ダミー棒１１における把持棒部２１と種棒部２２との接合箇所Ｃよりも把持棒部２１側を通らないようにしながら、バーナ１３で生成されるガラス微粒子をターゲットであるダミー棒１１へ吹き付ける。すると、ガラス微粒子は、ダミー棒１１における把持棒部２１にはほとんど堆積されず、主に種棒部２２より下方に堆積されることとなる。なお、複数のバーナ１３でガラス微粒子を吹き付ける場合は、通常は複数のバーナから出る火炎が交わることは無いので、最も把持棒部２１側に配置されたバーナ１３、つまり、最上部のバーナ１３について、把持棒部２１側の端部Ａを通るバーナ１３の軸線Ｘと平行な延長線Ｂが、ダミー棒１１における把持棒部２１と種棒部２２との接合箇所Ｃよりも把持棒部２１側を通らないようにする。   At this time, as shown in FIG. 2, the extension line B parallel to the axis X of the burner 13 passing through the end A on the gripping bar portion 21 side of the burner 13 is the gripping bar portion 21 and the seed bar portion 22 of the dummy bar 11. The glass particles generated by the burner 13 are sprayed onto the dummy rod 11 as a target while passing through the gripping bar portion 21 side rather than the joining portion C. Then, the glass particles are hardly deposited on the gripping bar portion 21 of the dummy rod 11 and are mainly deposited below the seed rod portion 22. When glass particles are sprayed with a plurality of burners 13, the flames from the plurality of burners usually do not intersect, so the burner 13 arranged closest to the gripping bar portion 21, that is, the uppermost burner 13 is used. The extension line B parallel to the axis X of the burner 13 passing through the end A on the gripping bar portion 21 side is closer to the gripping rod portion 21 side than the joint C between the gripping rod portion 21 and the seed rod portion 22 in the dummy rod 11. Do not pass through.

このようにしてガラス微粒子堆積体１５を形成したら、ダミー棒１１を把持機構１２から外してガラス微粒子堆積体１５を製造装置から取り出す。   When the glass particulate deposit 15 is thus formed, the dummy rod 11 is removed from the gripping mechanism 12 and the glass particulate deposit 15 is taken out of the manufacturing apparatus.

このようなガラス微粒子堆積体製造工程の後、製造したガラス微粒子堆積体１５に対して脱水及び焼結等の処理を施して透明化した後、または、透明化したガラス微粒子堆積体１５を母材として光ファイバを線引きした後など、把持棒部２１での把持が不要となったら、図３（ａ）に示すように、把持棒部２１と種棒部２２との接合箇所Ｃでダミー棒１１を切断し、図３（ｂ）に示すように、ダミー棒１１から把持棒部２１だけを切り離して取り外す。ダミー棒１１は、カッターまたは火炎溶断などで切断する。その後、取り外した把持棒部２１に再度種棒部２２を接合してダミー棒１１とし、このダミー棒１１を次のガラス微粒子堆積体１５の製造に用いる。   After such a glass fine particle deposit manufacturing process, the manufactured glass fine particle deposit 15 is subjected to a treatment such as dehydration and sintering to be transparent, or the transparent glass fine particle deposit 15 is made a base material. As shown in FIG. 3A, after the optical fiber is drawn, the dummy rod 11 is joined at the joint C between the holding rod portion 21 and the seed rod portion 22 as shown in FIG. Then, as shown in FIG. 3B, only the gripping bar portion 21 is separated from the dummy bar 11 and removed. The dummy bar 11 is cut by a cutter or flame cutting. Thereafter, the seed rod portion 22 is joined again to the removed grip rod portion 21 to form the dummy rod 11, and this dummy rod 11 is used for manufacturing the next glass particulate deposit 15.

このように、上記実施形態に係るガラス母材の製造方法によれば、ガラス微粒子堆積体製造工程において、ダミー棒１１における把持棒部２１にはガラス微粒子がほとんど堆積しないか、もしくは堆積後に除去可能な程度の少量の堆積量に抑えられるため、複雑な形状で高価な把持棒部２１を種棒部２２から切り離して再利用することができる。これにより、ダミー棒１１の購入費を削減でき、ガラス微粒子堆積体１５の製造コストを低く抑制して経済的にガラス母材を製造することができる。   As described above, according to the glass base material manufacturing method according to the above-described embodiment, in the glass particle deposition body manufacturing process, glass particles are hardly deposited on the gripping bar portion 21 of the dummy bar 11 or can be removed after deposition. Since the amount of deposition can be reduced to a small amount, the expensive gripping bar 21 having a complicated shape can be separated from the seed bar 22 and reused. Thereby, the purchase cost of the dummy rod 11 can be reduced, and the glass base material can be economically manufactured while suppressing the manufacturing cost of the glass particulate deposit 15.

なお、ガラス微粒子堆積体製造工程において把持棒部２１に少量のガラス微粒子が堆積してしまった場合には、把持棒部２１に付着したガラス微粒子を除去してから、その後の工程（脱水や焼結など）を行うことが好ましい。把持棒部２１に付着したガラス微粒子を後の工程の前に予め除去しておくことにより、より良い状態で把持棒部２１を再利用することが可能となる。本実施形態によれば、把持棒部２１にガラス微粒子が堆積したとしてもその量は少量であるため、堆積後に簡単に除去することができる。なお、除去する方法としては、掃除機で吸い取る、エアを吹き付ける、刷毛で掃う、等が挙げられる。   In addition, when a small amount of glass particles is deposited on the gripping bar portion 21 in the glass particle deposit manufacturing process, the glass particles adhering to the gripping bar portion 21 are removed, and then the subsequent steps (dehydration and firing) are performed. It is preferable to carry out the linking. By removing the glass particles adhering to the gripping bar 21 in advance before the subsequent process, the gripping bar 21 can be reused in a better state. According to the present embodiment, even if glass fine particles are deposited on the gripping bar portion 21, the amount thereof is small, and can be easily removed after deposition. Examples of the removal method include sucking with a vacuum cleaner, blowing air, and sweeping with a brush.

次に、ＯＶＤ（Outside Vapor Phase Deposition）法によって、例えば、光ファイバの母材となるガラス微粒子堆積体を製造する場合について説明する。
図４に示すように、ＯＶＤ法では、ガラスロッド４１の両端にダミー棒１１を一体的に接合し、ガラスロッド４１の両端側にそれぞれ配置された把持機構１２に、ダミー棒１１の把持棒部２１をそれぞれ把持させることによりガラスロッド４１を支持させる。このガラスロッド４１は、光ファイバのコア及びクラッドの一部となるものである。
そして、このように支持させたガラスロッド４１及びダミー棒１１の種棒部２２からなるターゲットを、軸回りに回転させながら軸方向へ往復移動させる。この状態において、ターゲットに対してバーナ１３からガラス微粒子を吹き付け、ガラス微粒子堆積体１５を製造する。 Next, description will be made on a case where a glass fine particle deposited body that becomes a base material of an optical fiber, for example, is manufactured by an OVD (Outside Vapor Phase Deposition) method.
As shown in FIG. 4, in the OVD method, the dummy rod 11 is integrally joined to both ends of the glass rod 41, and the holding rod portions of the dummy rod 11 are connected to the holding mechanisms 12 respectively arranged on both ends of the glass rod 41. The glass rod 41 is supported by gripping 21 respectively. The glass rod 41 is a part of the core and clad of the optical fiber.
And the target which consists of the seed rod part 22 of the glass rod 41 and the dummy rod 11 supported in this way is reciprocated to an axial direction, rotating around an axis | shaft. In this state, glass fine particles are sprayed from the burner 13 to the target to produce a glass fine particle deposit 15.

このとき、図５（ａ）に示すように、ターゲットの上端側では、バーナ１３における把持棒部２１側の端部Ａを通るバーナ１３の軸線Ｘと平行な延長線Ｂが、ダミー棒１１における把持棒部２１と種棒部２２との接合箇所Ｃよりも把持棒部２１側を通らないようにする。また、同様に、図５（Ｂ）に示すように、ターゲットの下端側においても、バーナ１３における把持棒部２１側の端部Ａを通るバーナ１３の軸線Ｘと平行な延長線Ｂが、ダミー棒１１における把持棒部２１と種棒部２２との接合箇所Ｃよりも把持棒部２１側を通らないようにする。なお、複数のバーナ１３でガラス微粒子を吹き付ける場合は、最も上下の把持棒部２１側に配置されたバーナ１３、つまり、最上部及び最下部に配置されたバーナ１３について、把持棒部２１側の端部Ａを通るバーナ１３の軸線Ｘと平行な延長線Ｂが、ダミー棒１１における把持棒部２１と種棒部２２との接合箇所Ｃよりも把持棒部２１側を通らないようにする。   At this time, as shown in FIG. 5A, on the upper end side of the target, an extension line B parallel to the axis X of the burner 13 passing through the end A on the gripping bar portion 21 side of the burner 13 is in the dummy rod 11. Do not pass the gripping bar 21 side of the joint C between the gripping bar 21 and the seed bar 22. Similarly, as shown in FIG. 5B, an extension line B parallel to the axis X of the burner 13 passing through the end A on the gripping bar portion 21 side of the burner 13 is also a dummy on the lower end side of the target. It is made not to pass the gripping bar part 21 side rather than the joint location C of the gripping bar part 21 and the seed bar part 22 in the stick 11. In addition, when spraying glass particulates with a plurality of burners 13, the burner 13 disposed on the uppermost and lowermost gripping bar portion 21 side, that is, the burner 13 disposed on the uppermost and lowermost portions, is disposed on the gripping bar portion 21 side. An extension line B parallel to the axis X of the burner 13 passing through the end A is prevented from passing through the gripping bar portion 21 side of the joint C between the gripping rod portion 21 and the seed rod portion 22 of the dummy rod 11.

すると、ガラス微粒子は、ダミー棒１１における把持棒部２１にはほとんど堆積しないか、もしくは堆積後に除去可能な程度の少量の堆積量に抑えられ、ガラスロッド４１及び種棒部２２に堆積されることとなる。
このようにしてガラス微粒子堆積体１５を形成したら、それぞれのダミー棒１１を把持機構１２から外してガラス微粒子堆積体１５を製造装置から取り出す。 Then, the glass fine particles are hardly deposited on the gripping rod portion 21 of the dummy rod 11 or are deposited on the glass rod 41 and the seed rod portion 22 while being suppressed to a small amount that can be removed after the deposition. It becomes.
When the glass particulate deposit 15 is formed in this way, each dummy rod 11 is removed from the gripping mechanism 12 and the glass particulate deposit 15 is taken out from the manufacturing apparatus.

このようなガラス微粒子堆積体製造工程の後、製造したガラス微粒子堆積体１５に対して脱水及び焼結等の処理を施して透明化した後、または、透明化したガラス微粒子堆積体１５を母材として光ファイバを線引きした後など、把持棒部２１での把持が不要となったら、図６（ａ）に示すように、把持棒部２１と種棒部２２との接合箇所Ｃでダミー棒１１をカッター等によってそれぞれ切断し、図６（ｂ）に示すように、ダミー棒１１から把持棒部２１だけを取り外す。
その後、取り外したそれぞれの把持棒部２１に種棒部２２を接合してダミー棒１１とし、これらダミー棒１１を次のガラス微粒子堆積体１５の製造に用いる。 After such a glass fine particle deposit manufacturing process, the manufactured glass fine particle deposit 15 is subjected to a treatment such as dehydration and sintering to be transparent, or the transparent glass fine particle deposit 15 is made a base material. As shown in FIG. 6A, the dummy rod 11 is joined at the joint C between the holding rod portion 21 and the seed rod portion 22 as shown in FIG. Are respectively cut by a cutter or the like, and only the gripping bar portion 21 is removed from the dummy bar 11 as shown in FIG.
Thereafter, the seed rod portion 22 is joined to each removed grip rod portion 21 to form the dummy rod 11, and these dummy rods 11 are used for manufacturing the next glass particulate deposit 15.

このように、このガラス母材の製造方法の場合も、ガラス微粒子堆積体製造工程において、ダミー棒１１における把持棒部２１へガラス微粒子がほとんど堆積しないか、もしくは堆積後に除去可能な程度の少量の堆積量に抑えられるため、複雑な形状で高価な把持棒部２１を種棒部２２から切り離して再利用することができる。特に、両端部にそれぞれダミー棒を用いる上記の製造方法では、ダミー棒１１の購入費をさらに削減することができ、ガラス微粒子堆積体１５の製造コストをさらに大幅に低減させて経済的にガラス母材を製造することができる。   Thus, also in the case of this glass base material manufacturing method, in the glass particle deposit body manufacturing process, glass particles are hardly deposited on the gripping bar portion 21 of the dummy bar 11 or a small amount that can be removed after deposition. Since the amount of deposition can be suppressed, the expensive gripping bar 21 having a complicated shape can be separated from the seed bar 22 and reused. In particular, in the above-described manufacturing method using dummy bars at both ends, the purchase cost of the dummy bars 11 can be further reduced, and the manufacturing cost of the glass particulate deposit 15 can be further greatly reduced to economically reduce the glass mother. The material can be manufactured.

１１：ダミー棒、１２：把持機構、１３：バーナ、１５：ガラス微粒子堆積体、２１：把持棒部、２２：種棒部（ターゲット）、４１：ガラスロッド（ターゲット）、Ａ：端部、Ｂ：延長線、Ｃ：接合箇所、Ｘ：軸線 11: dummy rod, 12: gripping mechanism, 13: burner, 15: glass particulate deposit, 21: gripping bar, 22: seed rod (target), 41: glass rod (target), A: end, B : Extension line, C: joint, X: axis

Claims (4)

把持機構に支持したターゲットへバーナで生成されるガラス微粒子を吹き付けて堆積させるガラス微粒子堆積体製造工程を含むガラス母材の製造方法であって、
前記ガラス微粒子堆積体製造工程では、
前記把持機構に把持される把持棒部に前記ターゲットとなる種棒部を一体的に接合してダミー棒とし、
前記ダミー棒の前記把持棒部を前記把持機構に把持させ、
前記バーナの前記把持棒部側の端部を通る前記バーナの軸線と平行な延長線が、前記ダミー棒における前記把持棒部と前記種棒部との接合箇所よりも前記把持棒部側を通らないようにしながら、前記バーナで生成されるガラス微粒子を前記ターゲットへ吹き付けることを特徴とするガラス母材の製造方法。 A glass base material manufacturing method including a glass microparticle deposit manufacturing process in which glass microparticles generated by a burner are sprayed and deposited on a target supported by a gripping mechanism,
In the glass fine particle deposit manufacturing process,
A seed bar part serving as the target is integrally joined to a gripping bar part gripped by the gripping mechanism to form a dummy bar,
Causing the gripping mechanism to grip the gripping bar portion of the dummy bar,
An extension line parallel to the axis of the burner passing through the end of the burner on the side of the gripping bar passes through the gripping bar part side of the dummy bar rather than a joint between the gripping bar part and the seed bar part. A method for producing a glass base material, characterized in that glass fine particles generated by the burner are sprayed onto the target while avoiding the above. 請求項１に記載のガラス母材の製造方法であって、
前記ガラス微粒子堆積体製造工程では、
ガラスロッドの両端に前記ダミー棒を一体的に接合し、
前記両端側にそれぞれ配置された前記把持機構に、前記ダミー棒の前記把持棒部をそれぞれ把持させることにより前記ガラスロッドを支持させ、
前記ガラスロッドと前記種棒部とからなるターゲットに対して前記バーナで生成されるガラス微粒子を吹き付けることを特徴とするガラス母材の製造方法。 It is a manufacturing method of the glass base material of Claim 1,
In the glass fine particle deposit manufacturing process,
The dummy rod is integrally joined to both ends of the glass rod,
The glass rods are supported by causing the gripping mechanisms respectively disposed on the both end sides to grip the gripping bar portions of the dummy bars,
A method for producing a glass base material, characterized in that glass fine particles generated by the burner are sprayed onto a target composed of the glass rod and the seed rod part. 請求項１または２に記載のガラス母材の製造方法であって、
前記ガラス微粒子堆積体製造工程より後に、
前記ダミー棒の前記把持棒部に付着したガラス微粒子を除去してから、前記ガラス微粒子堆積体を焼結することを特徴とするガラス母材の製造方法。 A method for producing a glass base material according to claim 1 or 2,
After the glass particle deposit manufacturing process,
A method for producing a glass base material, comprising: sintering the glass particulate deposit after removing glass particulates adhering to the grip rod portion of the dummy rod. 請求項１から３の何れか一項に記載のガラス母材の製造方法であって、
前記ガラス微粒子堆積体製造工程より後に、
前記把持棒部を前記ダミー棒から切り離し、切り離した把持棒部を再度ガラス微粒子堆積体製造用の把持棒部として使用することを特徴とするガラス母材の製造方法。 A method for producing a glass base material according to any one of claims 1 to 3,
After the glass particle deposit manufacturing process,
A method for producing a glass base material, wherein the gripping bar part is separated from the dummy bar, and the separated gripping bar part is used again as a gripping bar part for producing a glass particulate deposit.
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