| 摘要 |
PURPOSE:To lengthen the service life of a lamp by lowering gas permeability of heat resisting inorganic cement to fix a base onto the outer surface of a sealing end part of a bulb, and preventing the occurrence of cracks caused by contraction in the case of drying/solidifying it. CONSTITUTION:A sealing end part 2a of a bulb 2 is inserted into a base 6, and heat resisting inorganic cement 7 is filled between them, and as for a particle diameter, the heat resisting inorganic cement 7 to fix the base 6 to this sealing end part 2a is formed by mixing fire resisting powder A having a small diameter of 10-20mu and fire resisting powder B having a large diameter of 50-70mu together, and the mixing ratio B/A is set to be 1.5-2.5. |
