Title: Permanent magnets of different magnetic materials for magnetrons

Abstract: A magnetron comprises an anode cylinder, vanes extending from the inner surface of the anode cylinder toward the central axis of the anode cylinder, a cathode disposed at the central axis of the anode cylinder, an output antenna coupled in a high frequency coupling mode to the vanes, and a set of permanent magnets for creating a magnetic field having a line of magnetic force directed toward the axis of the anode cylinder. The set of permanent magnets constitutes a combination of, for example, an alnico magnet and rare earth magnet differing in coercive force.

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Inventors: Miura, Hiroshi (Tokyo, JA)

Application Number: 678757
Filing Date: 1976-04-21
Publication_date: 1977-09-13
Assignee: Tokyo Shibaura Electric Co., Ltd. (Kawasaki, JA)
Primary Class(es): 315/39.71 315/39.51, 315/39.75, 315/39.77
Other Classes:
US Patent Ref:

3392308	Jul, 1968	Cook	315/39.
3412285	Nov, 1968	Gerard	315/39.
3454825	Jul, 1969	Curtis	315/39.
3843904	Oct, 1974	Brown	315/39.
3855498	Dec, 1974	MacMaster et al.	315/39.
3984725	Oct, 1976	Cook et al.	315/39.

Other Refs:
Primary Examiner: Chatmon, Jr., Saxfield
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier