Magnetron and apparatus that uses microwaves

Abstract

The magnetron includes: an exhaust pipe in which an antenna is disposed in a vacuum-sealed space, and which extends along the central axis of the antenna; an insulation tube which extends along the central axis of the antenna, and of which one end is fixed to the exhaust pipe by brazing; and an antenna cap including a bottom portion and a tubular portion which is continuous with the bottom portion to extend along the axis of the antenna and of which a diameter on an open end side is larger than a diameter of the exhaust pipe. The tubular portion of the antenna cap covers: a brazed portion where the exhaust pipe and the insulation tube are brazed to each other; and a metalized portion.

Dependencies are inferred from the claim text.