JPH09259773A - Magnetron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain leakage of an optional frequency, and reduce a noise by forming holes and recessed parts at specific frequency intervals of an optional higher harmonic wave in an anode cylinder body and vanes. SOLUTION: A 1/4 periodic structure of an optional higher harmonic wave is constituted in a resonant cavity 3 by holes 7 formed in vanes 2 and recessed parts 8 formed in an anode cylinder body body 1. On an inside surface of the anode cylinder body 1, a projecting part 11 is formed in a resonant cavity 3a in which projecting parts 9 of the vanes 2 are opposed to each other, and a recessed part 12 is formed in a resonant cavity 3b in which recessed parts 10 of the vanes 2 are opposed to each other. An interval between the mutual projecting parts 9 of the vanes 2, an interval between the projecting parts 9 of the vanes 2 and the projecting part 11 of the anode cylinder body 1, an interval between the mutual recessed parts 10 of the vanes 2 and an interval between the recessed parts 10 of the vanes 2 and the recessed part 12 of the anode cylinder body 1 are formed in a length of 1/4 of a wave length of an optional higher harmonic wave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron used for high frequency heating equipment such as microwave ovens and radar.

[0002]

2. Description of the Related Art In this type of magnetron, a plurality of vanes are radially arranged on the inner circumference of an anode cylinder to form a plurality of resonance cavities surrounded by the anode cylinder and the vanes. The vanes are electrically connected by two pairs of strap rings, an antenna conductor is connected to one of the vanes, and microwaves resonated in the resonance cavity are output from the antenna conductor.

From the magnetron, various harmonics of the fundamental frequency are generated, and various measures have been studied in order to suppress the leakage, but it is not enough.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a magnetron capable of suppressing leakage of harmonics.

[0005]

A first means of the present invention is as follows.
An anode cylinder, and is disposed in the center direction from the inner surface of the anode cylinder,
A plurality of vanes forming a resonance cavity with the anode cylinder and an antenna conductor connected to the vane are provided, and a periodic structure having quarter wavelength intervals of arbitrary harmonics is formed in the resonance cavity. Characterize.

The second means of the present invention is to connect the anode cylinder, a plurality of vanes arranged in the center direction from the inner surface of the anode cylinder and forming a resonance cavity with the anode cylinder, and connected to the vanes. And a convex portion or a concave portion is formed in the resonance cavity at an interval of a quarter wavelength of an arbitrary harmonic wave.

A third means of the present invention is to connect the anode cylinder, a plurality of vanes arranged in the center direction from the inner surface of the anode cylinder and forming a resonance cavity with the anode cylinder, and connected to the vanes. And an antenna conductor that
It is characterized in that the holes are formed at intervals of one-half wavelength.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

Reference numeral 1 denotes an anode cylinder, in which a plurality of vanes 2 are arranged on the inner surface toward the center, and a plurality of resonance cavities 3 surrounded by the anode cylinder 1 and the vanes 2 are formed. 4 is an antenna conductor connected to one of the vanes 2, and 5 is the vane 2.
Inner strap rings attached to opposite side surfaces of the vane 2 to electrically connect every other vane 2, and a vane 2 attached to opposite side surfaces of the vane 2 to which the inner strap ring 5 is not connected. Is an outer strap ring that electrically connects every other sheet.

Reference numeral 7 is a hole formed in the vane 2, 8 is a recess formed in the anode cylinder 1, and the holes 7 and the recess 8 are formed at intervals of a quarter of a wavelength of an arbitrary harmonic. It constitutes a periodic structure.

Thus, the holes 7 formed in the vanes 2 and the recesses 8 formed in the anode cylinder 1 form a quarter-period structure of arbitrary harmonics in the resonance cavity 3. Arbitrary harmonic components are attenuated and reduced in the resonance cavity 3, and radio wave leakage from the antenna conductor 4 is reduced.

The fundamental wave component has a wavelength several times longer than that of the higher harmonic wave component and is not affected by the periodic structure composed of the holes 7 and the recesses 8.

FIG. 3 shows another embodiment, in which the vane 2 is pressed to form a convex portion 9 on one side surface and a concave portion 10 on the other side surface. The anode cylinder 1 is mounted so that they face each other. On the other hand, on the inner surface of the anode cylinder 1, the resonance cavity 3 in which the convex portions 9 of the vanes 2 face each other
A convex portion 11 is formed in a and a concave portion 12 is formed in the resonance cavity 3b where the concave portions 10 of the vane 2 face each other. The interval between the convex portions 9 of the vane 2, the interval between the convex portion 9 of the vane 2 and the convex portion 11 of the anode cylinder 1, the interval between the concave portions 10 of the vane 2, and the concave portion 10 of the vane 2 and the anode cylindrical body 1. The distance from the concave portion 12 is formed to be a quarter of the wavelength of the arbitrary harmonic, as in the above-described embodiment.

Also in this embodiment, as in the above-mentioned embodiment, a quarter of an arbitrary harmonic is placed in the resonance cavities 3a and 3b.
A periodic structure is constructed and any harmonics can reduce the leakage of components.

[0015]

According to the structure of the present invention, it is possible to suppress the leakage of an arbitrary frequency and reduce the noise.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of the present invention.

FIG. 2 is a top view of a main part with the same part cut away.

FIG. 3 is a main part perspective view showing the other embodiment.

[Explanation of symbols]

 1 Anode cylinder 2 Vane 3 Resonance cavity 3a Resonance cavity 3b Resonance cavity 4 Antenna conductor 7 Hole 8 Recess 9 Recess 9 Recess 11 Recess 12 Recess 12

Claims (3)

[Claims] 1. An anode cylinder, a plurality of vanes arranged in the center direction from the inner surface of the anode cylinder and forming a resonance cavity with the anode cylinder, and an antenna conductor connected to the vane. A magnetron, wherein a periodic structure having quarter wavelength intervals of arbitrary harmonics is formed in the resonance cavity. 2. An anode cylinder, a plurality of vanes arranged in the center direction from the inner surface of the anode cylinder to form a resonance cavity with the anode cylinder, and an antenna conductor connected to the vane, A magnetron, wherein convex portions or concave portions are formed in the resonant cavity at intervals of a quarter wavelength of an arbitrary harmonic. 3. An anode cylinder, a plurality of vanes disposed in the center direction from the inner surface of the anode cylinder and forming a resonance cavity with the anode cylinder, and an antenna conductor connected to the vane. A magnetron, characterized in that holes are formed in the vane at quarter wavelength intervals of arbitrary harmonics.