| 摘要 |
PURPOSE:In drawing, to reduce energy, and to lengthen life of furnace, by reflecting radiation energy radiated from an end face in a base end part of parent material in the end face direction so that it as incident energy reaches the parent material again. CONSTITUTION:A base end part of the parent material 10 is attached to the feed mechanism 11, the tip of the parent material is put in the furnace 12. The reflecting plate 13 is set right above the end face 10a in the base end part of the parent material 10. The reflecting plate 13 has preferably a spherical surface, and its has preferably a radius of curvature smaller than numberical aperture (NA) of the parent material 10. By selecting the reflecting plate 13 in this manner, the radiation energy R as incident energy can be reached from the end face 10a to the parent material 10. Consequently, since temperature of furnace can be lowered by the absorption amount of it, energy can be reduced, and simultaneously life of the furnace can be prolonged. |
