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US 4,395,657 AGranted
Magnetron unit with a magnetic field compensating means
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsIsao Tada, Toshio Okamura, Akira Kousaka, Kaichiro Nakai
Life of this patent
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Abstract
A magnetron unit has a magnetic flux path for magnetic flux supplied from a permanent magnet to the interaction space. A magnetic member is disposed outside the anode cylinder for providing a by-path for the magnetic flux supplied from the permanent magnet. This magnetic member is made of a magnetic compensating alloy whose magnetic permeability decreases with an increase in temperature.
Claims7
A magnetron unit comprising:
- an anode cylinder having a number of resonant cavities;
- a cathode disposed within the anode cylinder and extending along the axis of the anode cylinder with an interaction space defined between the resonant cavities and the cathode;
- a pair of pole pieces for generating a magnetic field in the interaction space;
- cover means for hermetically sealing the anode cylinder;
- a pair of permanent magnet members made of ferrite, disposed outside the anode cylinder and magnetically coupled with the pole pieces, thereby defining a main magnetic flux path in the interaction space;
- and
- at least one magnetic member made of magnetic compensating alloy, disposed between the permanent magnet members and magnetically coupled with the permanent magnet members, thereby defining a magnetic flux bypath parallel to the main magnetic flux path, the magnetic permeability of the magnetic member being reduced as the magnetic member is heated by heat generated in the anode cylinder.
4 more elements
A magnetron unit comprising:
- an anode cylinder provided with a number of resonant cavities therein;
- a cathode disposed within the anode cylinder and along the axis of the anode cylinder, an interaction space being defined between the anode resonant cavities and the cathode;
- at least one pole piece for supplying a magnetic field in the interaction space;
- cover means for hermetically sealing the anode cylinder;
- at least one permanent magnet member disposed outside the anode cylinder and magnetically coupled with the pole piece;
- a magnetic flux path being formed in the pole piece and the interaction space;
- and
- an additional permanent magnet for generating magnetic flux in the interaction space in the opposite direction to the magnetic flux supplied from said permanent magnet member, the magnetomotive force of said additional permanent magnet being reduced as the temperature of said additional permanent magnet is raised by heat generated in the anode cylinder.
5 more elements
Dependencies are inferred from the claim text.