Fluorescent lamp

摘要

A fluorescent lamp includes a glass bulb (3) whose inner surface is coated with a fluorescent substance (7), a glass bead (3) attached to an end of the glass bulb so as to seal the glass bulb, an exhaust tube (4) provided in the glass bead and sealed, a filament coil (6) arranged in an internal portion of the glass bulb, and an electrode terminal member (1) electrically connected to the filament coil. The glass bead controls the position of the electrode terminal member. The glass bulb preferably contains 5 to 10wt% of Na2O. The glass bulb, the glass bead and the exhaust tube preferably have a lead-free composition. <IMAGE>