The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1982
Filed:
Feb. 25, 1980
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A magnetron unit is provided with anode cylinder with a number of vanes defining resonance cavities, and a cathode disposed along the axis of the anode cylinder. An axial interaction space into which a magnetic field is developed is disposed between the vanes and the cathode. Provided is a pair of main pole pieces with the interaction space located therebetween to supply the magnetic field into the interaction space. Permanent magnet members are magnetically coupled with the pair of the main pole pieces for supplying magnetic energy to the main pole pieces. The permanent magnet members are magnetically coupled with each other by a yoke. Auxiliary pole pieces are disposed at the top ends of the main pole pieces at a given interval. The auxiliary pole pieces are supported by bimetal members fixed to them. When the temperature of the permanent magnet member, the bimetallic members rises moves the auxiliary pole pieces toward the interaction space. A reduction of the magnetomotive force of each permanent magnet member is offset by a reduction of the interval between the pair of the auxiliary pole pieces.