| 摘要 |
A glass tube ( 1 ) that is used in such a manner that an end face thereof is hermetically and firmly bonded to a surface of a panel ( 11 ) of a flat display tube so as to cover a ventilation hole ( 12 ) which is formed in the panel ( 11 ), the glass tube ( 1 ) including a flange portion ( 4 ) formed by heating work of the glass tube ( 1 ) and provided on an outer periphery near the end face on a side firmly bonded to the surface of the panel ( 11 ) of the flat display tube. When the flange portion ( 4 ) is formed, a tube end portion ( 2 ) protruding ahead of the flange portion ( 4 ) is left, so that a flange portion ( 4 ) face on a side facing the surface of the panel ( 11 ) of the flat display tube allows a frit glass ( 6 ) to be placed thereon, the frit glass ( 6 ) having a height equal to an interval (an outer peripheral face of the tube end portion) between the end face of the glass tube and the flange portion ( 4 ) face, which enables stable bonding of the glass tube ( 1 ) to the surface of the panel ( 11 ) of the flat display tube.
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