| 摘要 |
PURPOSE:To easily adjust the position of a molten metal outlet opening from a crusible in a heating furnace, and to uniform the metallic coating thickness of an optical fiber, by mounting the crusible on a fine adjustment table in such a way that the tip part of the lead-out pipe of the crusible is led out of the furnace. CONSTITUTION:At the side part of a crusible 4 for metal coating, a led-out pipe 5 having a molten metal outlet opening 6 at the tip is projected, and this crusible 13 is heated in a heating furnace 13 to melt a metal coating material 7 in the crusible 4; and an optical fiber wire 3 is passed through the molten metal swelling out of the outlet opening 6 of the lead-out pipe 5, and thus the optical fiber wire 3 is coated with metal to obtain a wire 3'. In this case, the crusible 4 is placed on a fine adjustment table 12 capable of moving finely and horizontally in the heating furnace 13 in such a way that the tip part 6 of the lead-out pipe 5 is led out of the furnace. Therefore, the thickness of the metallic coating of the wire 3 is made uniform. |
