Method for making flat elliptic thin glass tube for discharge tube

摘要

A flat elliptic thin glass tube for a discharge tube is produced by the following steps: (a) a cylindrical glass tube is hermetically sealed; (b) the cylindrical glass tube is heated and deformed in a mold by an increased internal pressure of the glass tube caused by the heating of the glass tube to form a flat elliptic glass tube, the mold having means for defining at least the minor axis of the flat elliptic glass tube; and (c) the flat elliptic glass tube is heated and drawn to form the flat elliptic thin glass tube.