Magnetron

Patent metadata

Field	Value
Publication number	US-12191107-B2
Application number	US-202117999068-A
Country	US
Kind code	B2
Filing date	Jul 7, 2021
Priority date	Jul 29, 2020
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A magnetron includes an anode cylindrical body, a plurality of vanes, a cathode filament, an input-side magnetic pole, an output-side magnetic pole, and a choke structure. The anode cylindrical body has a cylindrical shape with an input-side opening part and an output-side opening part. The plurality of vanes is radially disposed from a central axis of the anode cylindrical body to an inner wall surface of the anode cylindrical body. The cathode filament is disposed along the central axis of the anode cylindrical body. The input-side magnetic pole and the output-side magnetic pole are disposed on the input-side opening part and the output-side opening part, respectively. The choke structure is seamlessly formed and disposed so as to cover an opening rim of the input-side magnetic pole with respect to the central axis of the anode cylindrical body.

First claim

The invention claimed is:

1. A magnetron comprising:
an anode cylindrical body having a cylindrical shape with an input-side opening part and an output-side opening part;
a plurality of vanes radially disposed from a central axis of the anode cylindrical body to an inner wall surface of the anode cylindrical body;
a cathode filament disposed along the central axis of the anode cylindrical body;
an input-side magnetic pole and an output-side magnetic pole disposed on the input-side opening part and the output-side opening part, respectively; and
a choke structure disposed inside an opening provided in the input-side magnetic pole, wherein
the choke structure is seamlessly formed and covers an opening rim of the input-side magnetic pole with respect to the central axis of the anode cylindrical body.

2. The magnetron of claim 1 further comprising a heat sink bonded to the input-side magnetic pole, wherein
the input-side magnetic pole, the heat sink, and the choke structure are disposed facing each other, and spaces between the input-side magnetic pole, the heat sink, and the choke structure are mutually communicated.

3. The magnetron of claim 1 , wherein the input-side magnetic pole is seamlessly formed with the choke structure.

4. The magnetron of claim 1 , wherein the input-side magnetic pole is seamlessly formed with the choke structure and the heat sink.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ishii Takeshi

Classifications

• H01J23/20 Primary

  Cavity resonators; Adjustment or tuning thereof · CPC title

• H01J23/22

  Connections between resonators, e.g. strapping for connecting resonators of a magnetron · CPC title

• H01J25/50

  Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field (with travelling wave not moving completely around the electron space H01J25/42; functioning with plural reflection or with reversed cyclotron action H01J25/62, H01J25/64) · CPC title

• H01J23/005

  Cooling methods or arrangements (H01J23/033 takes precedence) · CPC title

• H01J23/15 Primary

  Means for preventing wave energy leakage structurally associated with tube leading-in arrangements, e.g. filters, chokes, attenuating devices · CPC title