# US 2014/0191657 A1 · Coaxial magnetron

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- Number: US 2014/0191657 A1
- Document ID: US20140191657A1
- Status: Published application
- Kind: A1
- Application number: 14/055,693
- Filed: 2013-10-16
- Published: 2014-07-10
- Earliest claimed: 2013-01-07
- Assignees: New Japan Radio Co., Ltd.
- Applicants: New Japan Radio Co., Ltd.
- Inventors: Hiroyuki MIYAMOTO; Hideyuki Obata; Akinori Umeda
- Web page: https://patentgrep.com/patent/US20140191657A1

## CPC

- H01J 23/005: {Cooling methods or arrangements (H01J23/033 takes precedence)}
- H01J 23/12: Vessels; Containers
- H01J 23/20: Cavity resonators; Adjustment or tuning thereof
- H01J 25/587: Multi-cavity magnetrons
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

The object of the presently disclosed embodiment is to improve heat dissipation and an overall cooling efficiency to raise a peak oscillation output. To achieve the object, there is provided a coaxial magnetron having the following configuration: Around a cathode, vanes and an anode cylinder form an anode resonant cavity, and a cylindrical side body forms an outer cavity. An input side structure having an input part and an upper structure are joined to both ends of the cylindrical side body. One end of the anode cylinder is joined to the input side structure. A groove (or step) for adjusting the distance between the structures and at the both ends is provided, and the groove is joined to the other end of the anode cylinder.

## Claims

### Claim 1

A coaxial magnetron, comprising:
a cathode;
an anode having an anode cylinder and vanes for forming an anode resonant cavity around the cathode;
a cylindrical side body forming an outer cavity coaxial with the anode resonant cavity around the anode cylinder;
a pair of end sealing structures joined to both ends of the cylindrical side body; and
an input part connected to the cathode through one of the end sealing structures,
wherein one end of the anode cylinder is joined to one of the end sealing structures, and the other end of the anode cylinder is joined to a groove or a step of the other of the end sealing structures, the groove or the step being formed on the inner surface of the other of the end sealing structures.

### Claim 2 (depends on 1)

The coaxial magnetron of claim 1, wherein a passage for running a coolant therethrough is provided in the vicinity of the anode cylinder in the end sealing structure in which the input part pass through, and a passage for running a coolant therethrough is also provided in the vicinity of the anode cylinder in the end sealing structure in which the input part is not disposed.

### Claim 3 (depends on 2)

The coaxial magnetron of claim 2, wherein central members are separated from outer periphery members in the end sealing structures at the both ends, and the central members of the end sealing structures are joined to the outer periphery members respectively after the outer periphery members of the end sealing structures are joined to the cylindrical side body.

### Claim 4 (depends on 1)

The coaxial magnetron of claim 1, wherein central members are separated from outer periphery members in the end sealing structures at the both ends, and the central members of the end sealing structures are joined to the outer periphery members respectively after the outer periphery members of the end sealing structures are joined to the cylindrical side body.

### Claim 5

A coaxial magnetron, comprising:
a cathode;
an anode having an anode cylinder and vanes for forming an anode resonant cavity around the cathode;
a cylindrical side body forming an outer cavity coaxial with the anode resonant cavity around the anode cylinder;
a pair of end sealing structures joined to both ends of the cylindrical side body; and
an input part connected to the cathode through one of the end sealing structures,
wherein one end of the anode cylinder is joined to one of the end sealing structures, and the other end of the anode cylinder is joined to a gap of the other of the end sealing structures, the gap being formed between a central member and an outer periphery member of the other of the end sealing structures so as to insert the anode cylinder.

### Claim 6 (depends on 5)

The coaxial magnetron of claim 5, wherein a passage for running a coolant therethrough is provided in the vicinity of the anode cylinder in the end sealing structure in which the input part pass through, and a passage for running a coolant therethrough is also provided in the vicinity of the anode cylinder in the end sealing structure in which the input part is not disposed.

### Claim 7 (depends on 6)

The coaxial magnetron of claim 6, wherein the central members are separated from the outer periphery members in the end sealing structures at the both ends, and the central members of the end sealing structures are joined to the outer periphery members respectively after the outer periphery members of the end sealing structures are joined to the cylindrical side body.

### Claim 8 (depends on 5)

The coaxial magnetron of claim 5, wherein the central members are separated from the outer periphery members in the end sealing structures at the both ends, and the central members of the end sealing structures are joined to the outer periphery members respectively after the outer periphery members of the end sealing structures are joined to the cylindrical side body.