| 摘要 |
In the magnetron, an upper end hat 122 A is used as a composing element of a cathode structure member 12 A and includes a portion 122 Aa which is in contact with one end portion 121 a of a filament coil 121 . The thickness of the portion 122 Aa is reduced, whereby the portion 122 Aa is held not in contact with a center lead 124 . Owing to this, heat generated in the filament coil 121 can travel to the upper end hat 122 A without traveling directly to the center lead 124 . Therefore, even when the quantity of input power is reduced to such a degree as to be able to reduce noise, or even when the electron radiation area of the filament coil 121 is reduced, the getter effect can be displayed fully. As a result of this, noise reduction and cost reduction can be realized at the same time.
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