[KASHIWAGI YUSUKE, YANAGA TOMIHISA] JP

[KOJIMA,Hiroki, YANAGA, Tomihisa] 6-1, Ohtemachi 2-chome, Chiyoda-ku, Tokyo 100-0004, JP A production apparatus capable of suppressing the generation of rusts on a base material gripper (5) and a rotation mechanism (2) is provided in a production of a porous glass preform for an optical fiber. In an apparatus for producing a porous glass preform by depositing glass fine particles, produced by a flame hydrolysis reaction using a burner (7), on a starting member (11) gripped by a base material gripper (5) in a reaction vessel (4), the base material gripper (5) is covered with a cover (6) , and gas is supplied to the inside of the cover (6) and the gas is caused to flow from the inside of the cover (6) to an inside of the reaction vessel (4), thus preventing exposure of the base material gripper (5) and the rotation mechanism (2) to hydrogen chloride gas coming from the flame hydrolysis reactions. ＜img id="iaf01" file="imgaf001.tif" wi="104" he="89" img-content="drawing" img-format="tif" /＞

[KOJIMA HIROKI, YANAGA TOMIHISA] JP The present invention is to provide an apparatus for manufacturing a porous glass preform capable of inhibiting rust in a substrate holder or a rotary tool. The apparatus for manufacturing a porous glass preform forms the porous glass preform by depositing glass particles, manufactured by flame hydrolysis using a burner, on a starting substrate held in a reaction container by the substrate holder. The substrate holder is covered by a cover, supplies gas to the cover and discharges the gas from the cover to the reaction container.

[Yusuke KASHIWAGI, Tomihisa YANAGA] JP Tokyo Provided is a manufacturing apparatus for manufacturing a soot deposition body, including a main burner that deposits glass microparticles on a target rod while moving parallel to a longitudinal direction of the target rod; and a side burner that is positioned outside of a movement range of the main burner in a movement direction of the main burner, and fires an end portion of the soot deposition body formed on the target rod. The side burner includes a plurality of heating burners arranged distanced from each other in a circumferential direction of the target rod. In the manufacturing apparatus described above, the main burner may include a plurality of deposition burners that are arranged distanced from each other in the circumferential direction of the target rod.

[Yusuke Kashiwagi, Tomihisa Yanaga] JP Tokyo Provided is a manufacturing apparatus for manufacturing a soot deposition body, including a main burner that deposits glass microparticles on a target rod while moving parallel to a longitudinal direction of the target rod; and a side burner that is positioned outside of a movement range of the main burner in a movement direction of the main burner, and fires an end portion of the soot deposition body formed on the target rod. The side burner includes a plurality of heating burners arranged distanced from each other in a circumferential direction of the target rod. In the manufacturing apparatus described above, the main burner may include a plurality of deposition burners that are arranged distanced from each other in the circumferential direction of the target rod.

[KOJIMA, Hiroki, YANAGA, Tomihisa] 6-1, Ohtemachi 2-chome, Chiyoda-ku, Tokyo 100-0004, JP

[Hiroki KOJIMA, Tomihisa YANAGA] JP Tokyo A production apparatus capable of suppressing the generation of rusts on a base material gripper and a rotation mechanism is provided in a production of a porous glass preform. In an apparatus for producing a porous glass preform by depositing glass fine particles, produced by a flame hydrolysis reaction using a burner, on a starting member gripped by a base material gripper in a reaction vessel, the base material gripper is covered with a cover, and gas is supplied to the inside of the cover and the gas is caused to flow from the inside of the cover to an inside of the reaction vessel.