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:
Mar. 15, 2011
Filed:
Oct. 25, 2007
Takeshi Ishii, Tochigi, JP;
Nagisa Kuwahara, Tochigi, JP;
Masayuki Aiga, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The magnetron includes: a cylindrical-shaped anode barrel memberhaving two openings respectively formed in the two end portions thereof; a cathode structure memberdisposed on the center axis of the anode barrel member; more than one anode vanedisposed radially through an action spacein the periphery of the cathode structure memberand fixedly mounted on the inner wall surface of the anode barrel member; and, a pair of funnel-shaped pole piecesandrespectively disposed in their associated ones of the two openings formed in the two end portions of the anode barrel member, each pole piece including a small-diameter flat portion FLhaving a penetration hole formed in the central portion thereof, a large-diameter flat portion FLhaving a diameter larger than the diameter of the small-diameter flat portion FL, and a conical-shaped slanting portion SL for connecting the large-diameter flat portion FLand small-diameter flat portion FLto each other. Of the pair of pole piecesand, the input side pole pieceincludes, besides the penetration holeA formed in the central portion thereof, three or more, preferably, four penetration holesB respectively formed in the slanting portion SL thereof, each hole having an area of 16.6 mm.