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:
Jan. 10, 2006
Filed:
Sep. 10, 2003
Hideyuki Obata, Kamifukuoka, JP;
Naoki Tsuji, Kamifukuoka, JP;
Hideyuki Obata, Kamifukuoka, JP;
Naoki Tsuji, Kamifukuoka, JP;
New Japan Radio Co., Ltd., Tokyo, JP;
Abstract
The object to the present invention is to provide a magnetron which can reduce spurious oscillation such as the π−1 mode which presents a problem particularly in magnetrons and can reduce spurious radiations without placing filters. The magnetron of the present invention includes an anodeformed by plural vanesin such a manner that inner endsare radially extended toward the center of the anode shellfrom the inner wall of a cylindrical anode shell, and a cathodeprovided at the center of the anode. The magnetron of the present invention further includes a pair of pole piecesprovided in such a manner that a magnetic field can be applied on the interaction spacewhere the inner endsof the vanesand the cathodeface with each other. At least one of the pair of pole pieces is provided in such a manner that in a range A at least ⅓ of the vane length L from the inner endof the vane, the distance B between the side surfacesof the vanes and the surfaceadjacent the inner endof the pole piecesis within 0.015 λ wherein λ is the oscillation wavelength of the magnetron, and said vane length is a distance from said one end to said inner end.