| 摘要 |
PURPOSE:To improve the withstand voltage characteristic by branching an inner lead from a connector crossing the surface near the surface facing the neck inner wall of an insulating support bar and arranging this inner lead toward a stem pin along almost the center of the surface. CONSTITUTION:A connector 10 is bent and arranged along the surface facing the inner wall of the neck tube 1 of a bead glass 9 so that the middle section is extended in the tube axis direction at the center section of the bead glass surface. An inner lead 11 is branched from the connector crossing the surface facing the inner wall of the neck tube of the bead glass and arranged toward a stem pin along the surface at the center section of the surface of the bead glass. The distances between the connector 10 and the fourth grid electrode 6 and between the inner lead 11 and the second grid electrode 4 and the first grid electrode 3 are wide, and the electric discharge between them is thereby suppressed. The electric discharge is prevented from reaching the second grid electrode, the first grid electrode, a cathode, and a heater.
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