| 摘要 |
There is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes a muffle tube (13), in which an optical fiber preform (15) is supplied, a heater (18) surrounding the muffle tube (13), a plurality of electrode connecting portion (22-25) extending from the heater (18), a plurality of electrodes (29, 30) connected to electrode connecting portions (22-25), and in conjunction therewith to an electric power source (33), and unifying means for unifying the temperature distribution along the circumferential direction. Also, there is provided an optical fiber drawing furnace capable of drawing an optical fiber (20) having small non-circularity, which drawing furnace includes an inner heater (41) surrounding a muffle tube (13), a pair of inner electrode connecting portions (43) extending from the inner heater (41), arranging in opposition to each other across the inner heater (41) and connecting to a power source (39) via a pair of electrodes (44), an outer heater (42) surrounding the inner heater (41), and a pair of outer electrode connecting portions (45) extended from the outer heater (42) and arranged in opposition to each other across the outer heater (42) in a direction perpendicular to opposing direction of the pair of inner electrode connecting portions (43), the outer electrode connecting portions (45) being connected to the power source (39) via a pair of electrodes (46). <IMAGE> |
