Magnetron

A magnetron and anode tube technology, applied in the field of magnetrons, can solve problems such as excess electrons, and achieve the effects of suppressing attenuation and reducing noise

Inactive Publication Date: 2011-08-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is believed that this is because the amount of electron emission is set so that the peak current can be guaranteed, so electrons become excessive in the small current region

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] figure 1 is a partial longitudinal sectional view of the cathode portion of the magnetron according to Embodiment 1 of the present invention. In addition, since the parts other than the cathode shown in this figure are different from the above Figure 32 The components of the conventional magnetron shown are the same, so their descriptions are omitted.

[0100] see figure 1 , the magnetron of this embodiment is configured such that the spiral filament 3 is disposed between the input-side end cap 61 and the output-side end cap 7 supported by the cathode support rod 8 . In particular, in this embodiment, the input side end cap 61 is configured so as to be compatible with Figure 32 Compared with the shaft sleeve 61a having a larger diameter, the shape in the middle extends toward the interior of the interaction space, and the shaft sleeve 61b having a smaller diameter and the end 3a of the filament 3 are fixed to each other. The output-side end cap 7 has the same shap...

Embodiment 2

[0109] Figure 6 is a partial longitudinal sectional view of a cathode portion of a magnetron according to Embodiment 2 of the present invention. In addition, since the parts other than the cathode shown in this figure are different from the above Figure 32 The components of the conventional magnetron shown are the same, so their descriptions are omitted.

[0110] exist Figure 6 In, configure the magnetron of this embodiment so that figure 1 The cathode of the above-mentioned Embodiment 1 shown is reversed, and the electron-emitting portion is shifted toward the input side.

[0111] Figure 7is a waveform diagram showing a noise level of 30 MHz or less when the size of the electron emission portion of the present embodiment is set to about 75% of the axial dimension of the plate blade and the electron emission portion is shifted to the input side.

[0112] Even if the electron-emitting portion is shifted toward the input side like this embodiment, unlike the cylinder th...

Embodiment 3

[0115] Figure 8 is a partial longitudinal sectional view of a cathode portion of a magnetron according to Embodiment 3 of the present invention. In addition, since the parts other than the cathode shown in this figure are different from the above Figure 32 The components of the conventional magnetron shown are the same, so their descriptions are omitted.

[0116] exist Figure 8 , the magnetron of this embodiment is configured such that the electron emission portion is configured to extend into the recess 72 a of the output-side end cap 72 . Referring to the drawings to describe this embodiment, the input side end cap 61 has the same figure 1 The structure shown in Example 1 is the same. figure 1 The illustrated output-side end cap is configured such that the sleeve 7a of the output-side end cap 7 and the inner diameter portion of the end portion 3b of the filament 3 are fixed to each other, and as Figure 8 The illustrated output side end cap 72 is formed such that th...

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PUM

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Abstract

To provide a magnetron capable of reducing noises in a low frequency band of 30 MHz or less without deteriorating the stability of a load depending on phases, and also ensuring the precision of assembly dimensions without increasing the number of components, a coiled filament 3 is arranged between an input-side end hat 61 and an output-side end hat 7 which are supported by a cathode supporting rod 8. A larger-diameter boss 61 a in the end hat 61 extends to the interior of an interaction space, a smaller-diameter boss 61 b and one end 3a of the filament 3 are secured to each other, and the other end 3b is secured to a boss 7a of the end hat 7. Here, the dimension of an axial free length part F which forms an electron emission part which is not secured to the end hats 61 and 7 of the filament 3 is set to 50% or more and 80% or less of the axial dimension H of plate-like vanes 2, and the electron emission part is arranged so as to be displaced to the output side.

Description

technical field [0001] The present invention relates to a magnetron used in a high-frequency device whose noise is intended to be reduced. Background technique [0002] A conventional magnetron will be explained below with reference to the drawings. [0003] Figure 32 is a longitudinal sectional view showing the interaction space in which electrons of a magnetron move in a conventional device. In this magnetron, a plurality of plate blades 2 (only two blades are shown in this figure) are arranged radially inside the anode tube 1, and the plate blades 2 pass through pressure equalizing rings 9, 10, 11 and 12 Connect alternately. By connecting the grading rings 9, 10, 11 and 12 alternately in this way, the magnetron will oscillate in a mode stable. Meanwhile, a cathode 13 constituted by a spiral filament 3 , a pair of end caps 6 and 7 , and a cathode support rod 8 is provided along the central axis of the anode tube 1 . The filament 3 is made of tungsten containing 1-2% t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/02H01J23/04H01J25/50
Inventor 桑原渚石井健相贺正幸
Owner PANASONIC CORP
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