JPS6472450A - Single base type fluorescent lamp - Google Patents

Abstract

PURPOSE:To check a temperature rise in a fine tube as well as to make a base compact is size by fixing the fine tube extended out of a leg end of a bent type bulb to a base bottom part via a bonding agent made up of mixing powder or small pieces of metal or a metal oxide. CONSTITUTION:A glass stem 4 with a fine tube for exhaust is sealed to a bridge connection 2 of a bent type light emitting tube 1 and double leg end part at the opposite side as holding an electrode 5. And, a tip part of either side of the fine tube 3 is inserted into a tubular part 7 of the bottom part of a base 6 containing this tip part and tightly attached with a bonding agent 8 mixed with metal powder. Ar and mercury are sealed in the inner part of the light emitting tube 1. Since the metal powder or the like mixed in the bonding agent 8 is high in heat conductivity, heat in the fine tube 3 is transmitted to the base 6 so efficiently, radiating the heat, so that even if the fine tube 3 is shortened in length, temperature at the tip part can be regulated to such a temperature that mercury vapor pressure becomes an optimum level from a luminous surface. Consequently, the base 6 containing the fine tube 3 can be made compact in size.