Patent ID: 6597105
Filing Date: 2003-07-22
Classification: H01J

Abstract:
A fluorescent lamp comprisinga glass tube having a fluorescent substance layer on the inner surface, a sealed portion formed at the end of said glass tube, a container having an inner space that is in communication with the inside of said glass tube and is not in communication with the outside of said glass tube, and a mercury amalgam pellet contained in said container; wherein said sealed portion is provided with a through hole for allowing communication between said glass tube and said container, the through hole being formed of a slender glass tube welded to the sealed portion and an open end of the slender glass tube protrudes toward the inside of the glass tube from the sealed portion, at least a part of said through hole in said sealed portion has an inner diameter smaller than the diameter of said mercury amalgam pellet, and the open end of the slender glass tube has a diameter that is smaller than the diameter of the amalgam pellet.