| 摘要 |
PURPOSE:To fix amalgam easily and reliably in this tube by encapsulating amalgam in thin tube then heating to fusable state to perform fusable sealing thereafter integrally welding the amalgam to the sealing section under high temperature. CONSTITUTION:Approximately spherical amalgam 19 is sealed in thin tube 18 utilizing an evacuation unit not shown. Then the thin tube 18 is heated in the way to fusable state by means of a burner 23 assembled in said unit thus to form a softening section 24 where fused glass is collected locally. Thereafter, said tube 18 is fusably sealed air-tightly at the portion of softening material 24 by pulling in the longitudinal direction, for example, to form a sealing section 25. After sealing, a light emission tube 8 is inverted vertically to fix the amalgam 19 to the softening section 24 or the sealing section 25 during when said section 24 or 25 is maintained in high temperature condition. In other word, it is positioned at the side of sealing section 25 in thin tube 18. |
