Patent ID: 7696697
Filing Date: 2010-04-13
Classification: H01J

Abstract:
1. A magnetron, comprising: an anode barrel member having more than one vane projected toward the center axis direction thereof; and a cathode structure member disposed on the center axis of the anode barrel member and forming an action space between the anode vanes and itself, wherein the cathode structure member includes a filament coil, upper and lower end hats respectively for supporting the two end portions of the filament coil, a center lead having a leading end portion fixed to the upper end hat and penetrating through the lower end hat while not in contact with the filament coil, and a getter disposed on the top surface of the upper end hat, wherein the portion of the upper end hat in contact with one end portion of the filament coil at a radial outside of the upper end hat is held not in contact with the center lead.