Electronic tubes
AssigneeHitachi, Ltd.
InventorsYoshitada Sakauchi, Masayuki Hikiba
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Abstract
In an electronic tube, a metal cylindrical member having, at the end, a cylindrical joint portion is bonded by brazing to the end of ceramic cylindrical member to form a hermetic seal structure. The metal cylindrical member is made of iron and dimensions thereof are specified such that the cylindrical joint portion has a wall thickness of 0.5 mm or less and a height of 1 mm or more.
Claims6
In an electronic tube of the type having a hermetic seal structure in which a metal cylindrical member having at least a cylindrical joint portion at the end is bonded to the end of a ceramic cylindrical member by brazing, the improvement of said hermetic seal structure wherein said metal cylindrical member is made of iron, and said cylindrical joint portion has a wall thickness of 0.5 mm or less and a height of 1 mm or more.
Dependencies are inferred from the claim text.