PURPOSE: To improve sticking efficiency and production rate by synthesizing fine glass particles in a flame of a burner, arranging positive and negative electrodes around the flame and depositing the fine glass particles on an object.
CONSTITUTION: An apparatus for producing a porous preform for optical fiber is capable of forming a flame 8 of a raw material Gas SiCl4 with a burner 6, producing fine particles of SiO2, etc., then arranging two pairs of positive and negative electrodes (11A) and (11B) around the flame 8 so as to surround the flame, subsequently applying a high frequency from a high-frequency power source 12 to the electrodes (11A) and (11B), converging the fine particles of the SiO2, etc., with a fine glass particle converting device 13 and depositing the fine particles on a core material or clad soot layer which is an object for deposition. Thereby, the porous preform for the optical fiber is produced.
ISHIDA SADANORI
MIKAMI TOSHIHIRO
