Introduction of mercury in tubes is essential because fluorescent lamps exploit the ultraviolet radiation emitted by mercury atoms. The method of dropping liquid mercury into the tube has been employed to charge the tube with mercury. Such present method of production is advantageous in that it aids the exhaust in during processing but is disadvantageous in that it cansel various defects in lamp quality.
To eliminate such disadvantage, a manufacturing method which use a mercury dispenser such as an Hg alloy mounted around the electrodes, and releases mercury within the tube after sealing off by means of an induced current is introduced.
Advantages in use of mercury dispensar are as follows;(1) the quantity of mercury to be introduced into lamp is very precise, (2) the pressure fluctuation of Argon to be introduced can be reduced. Consequently it is possible to prevent the fluctuation of lamp life and increase its average life. In addition, improvement of lumen maintenance is achieved.
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