Patent ID: 8040060

Claim:
An electron tube comprising: a vacuum vessel including a side tube portion made of glass and a plate-like member blocking one opening of the side tube portion and made of glass; a first metal film provided on an end face of the side tube portion; a second metal film arranged facing the first metal film and provided on a marginal part of a face at a vacuum side of the plate-like member; a third metal film provided on at least one of an outer wall face of the side tube portion adjacent to the end face and a side face of the plate-like member adjacent to the marginal part; and a metal member made of a low-melting-point metal, for sealing a gap between the side tube portion and the plate-like member while contacting the first metal film, the second metal film, and the third metal film, wherein the metal member climbs up onto the third metal film and between the first metal film and the second metal film.